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Health Terms starting with O

Common Health Terms | All Health Terms

2nd Letter:

- ( b c d e f i k l m n o p r s t u v w x z

O Antigens - The lipopolysaccharide-protein somatic antigens, usually from gram-negative bacteria, important in t...

O(6)-Methylguanine-DNA Methyltransferase - An enzyme that transfers methyl groups from O(6)-methylguanine, and other methylated moieties of DNA...

O-Acetyl-ADP-Ribose - An acetyl ester of ADENOSINE DIPHOSPHATE RIBOSE formed during NAD-dependent deacetylation of protein...

o-Aminoazotoluene - An azo dye with carcinogenic properties....

Obesity - A status with BODY WEIGHT that is grossly above the acceptable or desirable weight, usually due to a...

Obesity Hypoventilation Syndrome - HYPOVENTILATION syndrome in very obese persons with excessive ADIPOSE TISSUE around the ABDOMEN and ...

Obesity, Abdominal - A condition of having excess fat in the abdomen. Abdominal obesity is typically defined as waist cir...

Obesity, Morbid - The condition of weighing two, three, or more times the ideal weight, so called because it is associ...

Obidoxime Chloride - Cholinesterase reactivator occurring in two interchangeable isomeric forms, syn and anti....

Object Attachment - Emotional attachment to someone or something in the environment....

Observation - The act of regarding attentively and studying facts and occurrences, gathering data through analyzin...

Observer Variation - The failure by the observer to measure or identify a phenomenon accurately, which results in an erro...

Obsessive Behavior - Persistent, unwanted idea or impulse which is considered normal when it does not markedly interfere ...

Obsessive-Compulsive Disorder - An anxiety disorder characterized by recurrent, persistent obsessions or compulsions. Obsessions are...

Obstetric Labor Complications - Medical problems associated with OBSTETRIC LABOR, such as BREECH PRESENTATION; PREMATURE OBSTETRIC L...

Obstetric Labor, Premature - Onset of OBSTETRIC LABOR before term (TERM BIRTH) but usually after the FETUS has become viable. In ...

Obstetric Surgical Procedures - Surgery performed on the pregnant woman for conditions associated with pregnancy, labor, or the puer...

Obstetrical Forceps - Surgical instrument designed to extract the newborn by the head from the maternal passages without i...

Obstetrical Nursing - Nursing care given to the pregnant patient before, after, or during childbirth....

Obstetrics - A medical-surgical specialty concerned with management and care of women during pregnancy, parturiti...

Obstetrics and Gynecology Department, Hospital - Hospital department responsible for the administration and management of services provided for obste...

Obturator Nerve - A nerve originating in the lumbar spinal cord (L2 to L4) and traveling through the lumbar plexus to ...

Occipital Lobe - Posterior part of the cerebral hemisphere....

Occlusal Adjustment - Selective grinding of occlusal surfaces of the teeth in an effort to eliminate premature contacts an...

Occlusal Splints - Rigid or flexible appliances that overlay the occlusal surfaces of the teeth. They are used to treat...

Occlusive Dressings - Material, usually gauze or absorbent cotton, used to cover and protect wounds, to seal them from con...

Occult Blood - Chemical, spectroscopic, or microscopic detection of extremely small amounts of blood....

Occupational Dentistry - The branch of dentistry concerned with maintaining oral health of employees in occupational environm...

Occupational Diseases - Diseases due to factors involved in one's employment. (From Dorland, 28th ed)...

Occupational Exposure - The exposure to potentially harmful chemical, physical, or biological agents that occurs as a result...

Occupational Groups - Members of the various professions (e.g., PHYSICIANS) or occupations (e.g., POLICE)....

Occupational Health - The promotion and maintenance of physical and mental health in the work environment....

Occupational Health Nursing - The practice of nursing in the work environment....

Occupational Health Physicians - Physicians employed in a company or corporate setting that is generally not in the health care indus...

Occupational Health Services - Health services for employees, usually provided by the employer at the place of work....

Occupational Medicine - Medical specialty concerned with the promotion and maintenance of the physical and mental health of ...

Occupational Therapy - Skilled treatment that helps individuals achieve independence in all facets of their lives. It assis...

Occupational Therapy Department, Hospital - Hospital department responsible for the administration and provision of any occupational or work act...

Occupations - Crafts, trades, professions, or other means of earning a living....

Oceania - The islands of the central and South Pacific, including Micronesia, Melanesia, Polynesia, and tradit...

Oceanic Ancestry Group - Individuals whose ancestral origins are in the islands of the central and South Pacific, including M...

Oceanography - The science that deals with the ocean and its phenomena. (Webster, 3d ed)...

Oceanospirillaceae - A family of gram-negative bacteria in the order Oceanospirillales....

Oceans and Seas - Geographic locations providing habitat for marine organisms....

Ochlerotatus - A genus of mosquitoes in the family CULICIDAE. A large number of the species are found in the neotro...

o-Chlorobenzylidenemalonitrile - A riot control agent which causes temporary irritation of the eyes and the mucosal surface of the re...

Ochnaceae - A plant family of the order THEALES, subclass Dilleniidae, class Magnoliopsida that have evergreen, ...

Ochratoxins - Isocoumarins found in ASPERGILLUS OCHRACEUS and other FUNGI. Ochratoxin contaminated FOOD has been r...

Ochrobactrum - A genus of the family BRUCELLACEAE comprising obligately aerobic gram-negative rods with parallel si...

Ochrobactrum anthropi - A species of gram-negative, obligately aerobic rods. Motility occurs by peritrichous flagella. (From...

Ochromonas - A genus of GOLDEN-BROWN ALGAE in the family Ochromonadaceae, found mostly in freshwater. They bear t...

Ochronosis - The yellowish discoloration of connective tissue due to deposition of HOMOGENTISIC ACID (a brown-bla...

Ochrosia - A plant genus of the family Apocynaceae. Species of this genus contain 9-methoxyellipticine (ELLIPTI...

Ocimum basilicum - A plant species of the genus OCIMUM, family LAMIACEAE. It is a condiment with carminative properties...

Ocotea - A plant genus in the LAURACEAE family. The common name of stinkwood is also used for Zieria (RUTACEA...

Octamer Transcription Factor-1 - A ubiquitously expressed octamer transcription factor that regulates GENETIC TRANSCRIPTION of SMALL ...

Octamer Transcription Factor-2 - An octamer transcription factor expressed primarily in B-LYMPHOCYTES and the developing CENTRAL NERV...

Octamer Transcription Factor-3 - An octamer transcription factor that is expressed primarily in totipotent embryonic STEM CELLS and G...

Octamer Transcription Factor-6 - An octamer transcription factor that plays an important role in the MYELIN SHEATH development by SCH...

Octamer Transcription Factors - A family of POU domain factors that bind the octamer motif ATTTGCAT in enhancer and PROMOTER REGIONS...

Octanes - Eight-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives....

Octanols - Isomeric forms and derivatives of octanol (C8H17OH)....

Octodon - A genus of diurnal rats in the family Octodonidae, found in South America. The species Octodon degus...

Octopamine - An alpha-adrenergic sympathomimetic amine, biosynthesized from tyramine in the CNS and platelets and...

Octopodiformes - A superorder in the class CEPHALOPODA, consisting of the orders Octopoda (octopus) with over 200 spe...

Octoxynol - Nonionic surfactant mixtures varying in the number of repeating ethoxy (oxy-1,2-ethanediyl) groups. ...

Octreotide - A potent, long-acting synthetic SOMATOSTATIN octapeptide analog that inhibits secretion of GROWTH HO...

Ocular Hypertension - A condition in which the intraocular pressure is elevated above normal and which may lead to glaucom...

Ocular Hypotension - Abnormally low intraocular pressure often related to chronic inflammation (uveitis)....

Ocular Motility Disorders - Disorders that feature impairment of eye movements as a primary manifestation of disease. These cond...

Ocular Physiological Phenomena - Processes and properties of the EYE as a whole or of any of its parts....

Ocular Physiological Processes - Biological action and events that support the functions of the EYE and VISION, OCULAR....

Oculocerebrorenal Syndrome - A sex-linked recessive disorder affecting multiple systems including the EYE, the NERVOUS SYSTEM, an...

Oculomotor Muscles - The muscles that move the eye. Included in this group are the medial rectus, lateral rectus, superio...

Oculomotor Nerve - The 3d cranial nerve. The oculomotor nerve sends motor fibers to the levator muscles of the eyelid a...

Oculomotor Nerve Diseases - Diseases of the oculomotor nerve or nucleus that result in weakness or paralysis of the superior rec...

Odds Ratio - The ratio of two odds. The exposure-odds ratio for case control data is the ratio of the odds in fav...

Odontodysplasia - A localized arrested tooth development which appears to involve most commonly the anterior teeth, us...

Odontogenesis - The process of TOOTH formation. It is divided into several stages including: the dental lamina stage...

Odontogenic Cyst, Calcifying - A mixed radiolucent-radiopaque lesion of the jaws with features of both a cyst and a solid neoplasm....

Odontogenic Cysts - Cysts found in the jaws and arising from epithelium involved in tooth formation. They include follic...

Odontogenic Tumor, Squamous - A well-differentiated, benign, hamartomatous proliferation of odontogenic epithelium, probably arisi...

Odontogenic Tumors - Neoplasms produced from tooth-forming tissues....

Odontoid Process - The toothlike process on the upper surface of the axis, which articulates with the CERVICAL ATLAS ab...

Odontoma - A mixed tumor of odontogenic origin, in which both the epithelial and mesenchymal cells exhibit comp...

Odors - The volatile portions of substances perceptible by the sense of smell. (Grant & Hackh's Chemical Dic...

Oedipus Complex - Attachment of the child to the parent of the opposite sex, accompanied by envious and aggressive fee...

Oenanthe - A plant genus of the family APIACEAE that is sometimes called Hemlock Water Dropwort but should not ...

Oenococcus - A genus of GRAM-POSITIVE COCCI in the family LEUCONOSTOCACEAE. It is the primary bacteria involved i...

Oenothera - A plant genus of the family ONAGRACEAE. Members contain oenotheins....

Oenothera biennis - A plant species, of the genus OENOTHERA, family ONAGRACEAE, that is the source of evening primrose o...

Oesophagostomiasis - Infection of the intestinal tract with worms of the genus OESOPHAGOSTOMUM. This condition occurs mai...

Oesophagostomum - A genus of nematodes of the superfamily STRONGYLOIDEA, parasitic in the intestines of animals. The a...

Office Automation - Use of computers or computer systems for doing routine clerical work, e.g., billing, records pertain...

Office Management - Planning, organizing, and administering activities in an office....

Office Nursing - Nursing practice limited to an office setting....

Office Visits - Visits made by patients to health service providers' offices for diagnosis, treatment, and follow-up...

Off-Label Use - The practice of prescribing or using a drug outside the scope of the drug's official approved label ...

Off-Road Motor Vehicles - Motorized, recreational vehicles used on non-public roads. They include all-terrain vehicles, dirt-b...

Ofloxacin - A synthetic fluoroquinolone (FLUOROQUINOLONES) antibacterial agent that inhibits the supercoiling ac...

Oils - Unctuous combustible substances that are liquid or easily liquefiable on warming, and are soluble in...

Oils, Volatile - Oils which evaporate readily. The volatile oils occur in aromatic plants, to which they give odor an...

Ointment Bases - Various mixtures of fats, waxes, animal and plant oils and solid and liquid hydrocarbons; vehicles f...

Ointments - Semisolid preparations used topically for protective emollient effects or as a vehicle for local adm...

Okadaic Acid - A specific inhibitor of phosphoserine/threonine protein phosphatase 1 and 2a. It is also a potent tu...

Olacaceae - A small plant family of the order Santalales, subclass Rosidae, class Magnoliopsida....

Old Age Assistance - Financial assistance for the impoverished elderly through public funding of programs, services, and ...

Oldenlandia - A plant genus of the family RUBIACEAE. Some species are used as an ingredient in Chinese and African...

Olea - A plant genus of the family OLEACEAE. The olive fruit is the source of olive oil....

Oleaceae - A plant family of the order Scrophulariales subclass Asteridae, class Magnoliopsida. The leaves are...

Oleandomycin - Antibiotic macrolide produced by Streptomyces antibioticus....

Oleanolic Acid - A pentacyclic triterpene that occurs widely in many PLANTS as the free acid or the aglycone for many...

Oleavirus - A genus in the family BROMOVIRIDAE containing one species: Olive latent virus 2....

Olecranon Process - A prominent projection of the ulna that that articulates with the humerus and forms the outer protub...

Oleic Acid - An unsaturated fatty acid that is the most widely distributed and abundant fatty acid in nature. It ...

Oleic Acids - A group of fatty acids that contain 18 carbon atoms and a double bond at the omega 9 carbon....

Olfaction Disorders - Loss of or impaired ability to smell. This may be caused by OLFACTORY NERVE DISEASES; PARANASAL SINU...

Olfactory Bulb - Ovoid body resting on the cribriform plate of the ethmoid bone where the olfactory nerve terminates....

Olfactory Marker Protein - A ubiquitous, cytoplasmic protein found in mature OLFACTORY RECEPTOR NEURONS of all VERTEBRATES. It ...

Olfactory Mucosa - That portion of the nasal mucosa containing the sensory nerve endings for SMELL, located at the dome...

Olfactory Nerve - The 1st cranial nerve. The olfactory nerve conveys the sense of smell. It is formed by the axons of ...

Olfactory Nerve Diseases - Diseases of the first cranial (olfactory) nerve, which usually feature anosmia or other alterations ...

Olfactory Pathways - Set of nerve fibers conducting impulses from olfactory receptors to the cerebral cortex. It includes...

Olfactory Perception - The process by which the nature and meaning of olfactory stimuli, such as odors, are recognized and ...

Olfactory Receptor Neurons - Neurons in the OLFACTORY EPITHELIUM with proteins (RECEPTORS, ODORANT) that bind, and thus detect, o...

Oligo-1,6-Glucosidase - An enzyme that catalyzes the endohydrolysis of 1,6-alpha-glucosidic linkages in isomaltose and dextr...

Oligochaeta - A class of annelid worms with few setae per segment. It includes the earthworms such as Lumbricus an...

Oligoclonal Bands - Multiple protein bands serving as markers of specific ANTIBODIES and detected by ELECTROPHORESIS of ...

Oligodendroglia - A class of large neuroglial (macroglial) cells in the central nervous system. Oligodendroglia may be...

Oligodendroglioma - A relatively slow-growing glioma that is derived from oligodendrocytes and tends to occur in the cer...

Oligodeoxyribonucleotides - A group of deoxyribonucleotides (up to 12) in which the phosphate residues of each deoxyribonucleoti...

Oligodeoxyribonucleotides, Antisense - Short fragments of DNA that are used to alter the function of target RNAs or DNAs to which they hybr...

Oligohydramnios - A condition of abnormally low AMNIOTIC FLUID volume. Principal causes include malformations of fetal...

Oligohymenophorea - A class of ciliate protozoa. Characteristics include the presence of a well developed oral apparatus...

Oligomenorrhea - Abnormally infrequent menstruation....

Oligomycins - A closely related group of toxic substances elaborated by various strains of Streptomyces. They are ...

Oligonucleotide Array Sequence Analysis - Hybridization of a nucleic acid sample to a very large set of oligonucleotide probes, which are atta...

Oligonucleotide Probes - Synthetic or natural oligonucleotides used in hybridization studies in order to identify and study s...

Oligonucleotides - Polymers made up of a few (2-20) nucleotides. In molecular genetics, they refer to a short sequence ...

Oligonucleotides, Antisense - Short fragments of DNA or RNA that are used to alter the function of target RNAs or DNAs to which th...

Oligopeptides - Peptides composed of between two and twelve amino acids....

Oligoribonucleotides - A group of ribonucleotides (up to 12) in which the phosphate residues of each ribonucleotide act as ...

Oligoribonucleotides, Antisense - Short fragments of RNA that are used to alter the function of target RNAs or DNAs to which they hybr...

Oligosaccharides - Carbohydrates consisting of between two (DISACCHARIDES) and ten MONOSACCHARIDES connected by either ...

Oligosaccharides, Branched-Chain - Oligosaccharides containing various types of glycosidic linkages that yield branching or antennae. T...

Oligospermia - A condition of suboptimal concentration of SPERMATOZOA in the ejaculated SEMEN to ensure successful ...

Oliguria - Decreased URINE output that is below the normal range. Oliguria can be defined as urine output of le...

Olivomycins - A mixture of several closely related glycosidic antibiotics obtained from Actinomyces (or Streptomyc...

Olivopontocerebellar Atrophies - A group of inherited and sporadic disorders which share progressive ataxia in combination with atrop...

Oman - A sultanate on the southeast coast of the Arabian peninsula. Its capital is Masqat. Before the 16th ...

Omasum - The third stomach of ruminants, situated on the right side of the abdomen at a higher level than the...

omega-Agatoxin IVA - A neuropeptide toxin from the venom of the funnel web spider, Agelenopsis aperta. It inhibits CALCIU...

omega-Chloroacetophenone - A potent eye, throat, and skin irritant. One of its uses is as a riot control agent....

omega-Conotoxin GVIA - A neurotoxic peptide, which is a cleavage product (VIa) of the omega-Conotoxin precursor protein con...

omega-Conotoxins - A family of structurally related neurotoxic peptides from mollusk venom that inhibit voltage-activat...

omega-Crystallins - A type of crystallin that has been found in the lens (LENS, CRYSTALLINE) of certain species of MOLLU...

omega-N-Methylarginine - A competitive inhibitor of nitric oxide synthetase....

Omentum - A double-layered fold of peritoneum that attaches the STOMACH to other organs in the ABDOMINAL CAVIT...

Omeprazole - A highly effective inhibitor of gastric acid secretion used in the therapy of STOMACH ULCERS and ZOL...

Onagraceae - The evening primrose plant family of the order Myrtales, subclass Rosidae, class Magnoliopsida. Flow...

Onchocerca - A genus of parasitic nematodes whose organisms live and breed in skin and subcutaneous tissues. Onch...

Onchocerca volvulus - A species of parasitic nematodes widely distributed throughout central Africa and also found in nort...

Onchocerciasis - Infection with nematodes of the genus ONCHOCERCA. Characteristics include the presence of firm subcu...

Onchocerciasis, Ocular - Filarial infection of the eyes transmitted from person to person by bites of Onchocerca volvulus-inf...

Oncogene Fusion - The GENETIC RECOMBINATION of the parts of two or more GENES, including an ONCOGENE as at least one o...

Oncogene Protein gp140(v-fms) - Transforming glycoprotein coded by the fms oncogene from the Susan McDonough strain of feline sarcom...

Oncogene Protein p21(ras) - Transforming protein encoded by ras oncogenes. Point mutations in the cellular ras gene (c-ras) can ...

Oncogene Protein p55(v-myc) - Transforming protein coded by myc oncogenes. The v-myc protein has been found in several replication...

Oncogene Protein p65(gag-jun) - Transforming protein coded by jun oncogenes (GENES, JUN). This is a gag-onc fusion protein of about ...

Oncogene Protein pp60(v-src) - A tyrosine-specific protein kinase encoded by the v-src oncogene of ROUS SARCOMA VIRUS. The transfor...

Oncogene Protein tpr-met - The GENETIC TRANSLATION product from a GENE FUSION between a sequence from the tpr protein gene on t...

Oncogene Protein v-akt - A viral oncoprotein originally isolated from a murine T CELL LYMPHOMA infected with the acutely tran...

Oncogene Protein v-cbl - An oncoprotein from the Cas NS-1 murine retrovirus that induces pre- B-CELL LYMPHOMA and MYELOID LEU...

Oncogene Protein v-crk - A signal transducing adaptor protein that is encoded by the crk ONCOGENE from TYPE C AVIAN RETROVIRU...

Oncogene Protein v-maf - An oncogene protein that was originally isolated from a spontaneous musculo-aponeurotic FIBROSARCOMA...

Oncogene Proteins - Proteins coded by oncogenes. They include proteins resulting from the fusion of an oncogene and anot...

Oncogene Proteins v-abl - Transforming proteins encoded by the abl oncogenes. Oncogenic transformation of c-abl to v-abl occur...

Oncogene Proteins v-erbA - Transforming proteins encoded by erbA oncogenes from the avian erythroblastosis virus. They are trun...

Oncogene Proteins v-erbB - Transforming proteins encoded by erbB oncogenes from the avian erythroblastosis virus. The protein i...

Oncogene Proteins v-fos - Transforming proteins coded by fos oncogenes. These proteins have been found in the Finkel-Biskis-Ji...

Oncogene Proteins v-mos - Transforming proteins coded by mos oncogenes. The v-mos proteins were originally isolated from the M...

Oncogene Proteins v-myb - Transforming proteins coded by myb oncogenes. Transformation of cells by v-myb in conjunction with v...

Oncogene Proteins v-raf - A family of transforming proteins isolated from retroviruses such as MOUSE SARCOMA VIRUSES. They are...

Oncogene Proteins v-rel - Transforming proteins coded by rel oncogenes. The v-rel protein competes with rel-related proteins a...

Oncogene Proteins v-sis - Transforming proteins coded by sis oncogenes. Transformation of cells by v-sis is related to its int...

Oncogene Proteins, Fusion - The GENETIC TRANSLATION products of the fusion between an ONCOGENE and another gene. The latter may ...

Oncogene Proteins, Viral - Products of viral oncogenes, most commonly retroviral oncogenes. They usually have transforming and ...

Oncogenes - Genes whose gain-of-function alterations lead to NEOPLASTIC CELL TRANSFORMATION. They include, for e...

Oncogenic Viruses - Viruses that produce tumors....

Oncologic Nursing - Nursing care provided cancer patients. It includes aspects of family functioning through education o...

Oncology Service, Hospital - The hospital department responsible for the administration and provision of diagnostic and therapeut...

Oncolytic Virotherapy - Use of attenuated VIRUSES as ANTINEOPLASTIC AGENTS to selectively kill CANCER cells....

Oncolytic Viruses - Tumor-selective, replication competent VIRUSES that have antineoplastic effects. This is achieved by...

Oncorhynchus - A genus of the family SALMONIDAE (salmons and trouts). They are named for their hooked (onco) nose (...

Oncorhynchus keta - An anadromous species of SALMON found in the streams of the Pacific coast from Sacramento north, and...

Oncorhynchus kisutch - An anadromous species of SALMON ranging from the Arctic and Pacific Oceans to Monterey Bay, Californ...

Oncorhynchus mykiss - A large stout-bodied, sometimes anadromous, TROUT found in still and flowing waters of the Pacific c...

Oncostatin M - A cytokine with both pro- and anti-inflammatory actions that depend upon the cellular microenvironme...

Oncostatin M Receptor beta Subunit - An ONCOSTATIN M-specific receptor subunit that combines with CYTOKINE RECEPTOR GP130 to form the ONC...

Ondansetron - A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and v...

One-Carbon Group Transferases - A subclass of transferases that transfer chemical groups containing a single carbon. These include t...

Onecut Transcription Factors - A family of transcription factors that contain a single cut domain and a divergent homeodomain. They...

Onions - Herbaceous biennial plants and their edible bulbs, belonging to the Liliaceae....

Onium Compounds - Ions with the suffix -onium, indicating cations with coordination number 4 of the type RxA+ which ar...

Online Systems - Systems where the input data enter the computer directly from the point of origin (usually a termina...

Only Child - Child who has no siblings....

Onopordum - A plant genus of the family ASTERACEAE. Members contain eudesmane and elemane SESQUITERPENES....

Ontario - A province of Canada lying between the provinces of Manitoba and Quebec. Its capital is Toronto. It ...

Onycholysis - Separation of nail plate from the underlying nail bed. It can be a sign of skin disease, infection (...

Onychomycosis - A fungal infection of the nail plate, usually caused by a DERMATOPHYTES; YEASTS; or nondermatophyte ...

Onygenales - An order of fungi in the phylum ASCOMYCOTA containing many medically important species. There are fo...

Oocysts - Zygote-containing cysts of sporozoan protozoa. Further development in an oocyst produces small indiv...

Oocyte Donation - Transfer of preovulatory oocytes from donor to a suitable host. Oocytes are collected, fertilized in...

Oocyte Retrieval - Procedures to obtain viable OOCYTES from the host. Oocytes most often are collected by needle aspira...

Oocytes - Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocyt...

Oogenesis - The process of germ cell development in the female from the primordial germ cells through OOGONIA to...

Oogonia - Euploid female germ cells of an early stage of OOGENESIS, derived from primordial germ cells during ...

Oomycetes - A group of ALGAE, formerly considered FUNGI, whose exact taxonomic level is unsettled. Many consider...

Oophoritis - Inflammation of the OVARY, generally caused by an ascending infection of organisms from the endocerv...

Open Bite - A condition in which certain opposing teeth fail to establish occlusal contact when the jaws are clo...

Open Reading Frames - A sequence of successive nucleotide triplets that are read as CODONS specifying AMINO ACIDS and begi...

Operating Room Information Systems - Information systems, usually computer-assisted, designed to store, manipulate, and retrieve informat...

Operating Room Nursing - The functions of the professional nurse in the operating room....

Operating Room Technicians - Specially trained personnel to assist in routine technical procedures in the operating room....

Operating Rooms - Facilities equipped for performing surgery....

Operations Research - A group of techniques developed to apply scientific methods and tools to solve the problems of DECIS...

Operator Regions, Genetic - The regulatory elements of an OPERON to which activators or repressors bind thereby effecting the tr...

Operon - In bacteria, a group of metabolically related genes, with a common promoter, whose transcription int...

Ophiopogon - A plant genus of the family LILIACEAE. Members contain steroidal glycosides and provide an ingredien...

Ophiostoma - A genus of fungi in the family Ophiostomataceae, order OPHIOSTOMATALES. Several species are the sour...

Ophiostomatales - An order of fungi in the phylum ASCOMYCOTA that are important plant pathogens....

o-Phthalaldehyde - A reagent that forms fluorescent conjugation products with primary amines. It is used for the detect...

Ophthalmia Neonatorum - Acute conjunctival inflammation in the newborn, usually caused by maternal gonococcal infection. The...

Ophthalmia, Sympathetic - Granulomatous uveitis which follows in one eye after a penetrating injury to the other eye; the seco...

Ophthalmic Artery - Artery originating from the internal carotid artery and distributing to the eye, orbit and adjacent ...

Ophthalmic Assistants - Persons academically trained to care for patients with eye diseases or structural defects of the eye...

Ophthalmic Nerve - A sensory branch of the trigeminal (5th cranial) nerve. The ophthalmic nerve carries general afferen...

Ophthalmic Solutions - Sterile solutions, essentially free from foreign particles and suitably compounded and dispensed, fo...

Ophthalmodynamometry - Measurement of the blood pressure of the retinal vessels. It is used also for the determination of t...

Ophthalmologic Surgical Procedures - Surgery performed on the eye or any of its parts....

Ophthalmology - A surgical specialty concerned with the structure and function of the eye and the medical and surgic...

Ophthalmoplegia - Paralysis of one or more of the ocular muscles due to disorders of the eye muscles, neuromuscular ju...

Ophthalmoplegia, Chronic Progressive External - A mitochondrial myopathy characterized by slowly progressive paralysis of the levator palpebrae, orb...

Ophthalmoscopes - Devices for examining the interior of the eye, permitting the clear visualization of the structures ...

Ophthalmoscopy - Examination of the interior of the eye with an ophthalmoscope....

Opiate Alkaloids - Alkaloids found in OPIUM from PAPAVER that induce analgesic and narcotic effects by action upon OPIO...

Opioid Peptides - The endogenous peptides with opiate-like activity. The three major classes currently recognized are ...

Opioid-Related Disorders - Disorders related or resulting from abuse or mis-use of opioids....

Opipramol - A tricyclic antidepressant with actions similar to AMITRIPTYLINE....

Opisthorchiasis - Infection with flukes of the genus Opisthorchis....

Opisthorchidae - A family of lanceolate liver flukes of the class Trematoda which occurs in animals and man. There ar...

Opisthorchis - A genus of trematode liver flukes of the family Opisthorchidae. It consists of the following species...

Opium - The air-dried exudate from the unripe seed capsule of the opium poppy, Papaver somniferum, or its va...

Oplopanax - A plant genus in the family ARALIACEAE, order Apiales, subclass Rosidae. It is the source of cirense...

Opossums - New World marsupials of the family Didelphidae. Opossums are omnivorous, largely nocturnal and arbor...

Opportunistic Infections - An infection caused by an organism which becomes pathogenic under certain conditions, e.g., during i...

Opsins - Photosensitive proteins in the membranes of PHOTORECEPTOR CELLS such as the rods and the cones. Opsi...

Opsoclonus-Myoclonus Syndrome - A neurological condition that is characterized by uncontrolled rapid irregular movements of the eye ...

Opsonin Proteins - Proteins that bind to particles and cells to increase susceptibility to PHAGOCYTOSIS, especially ANT...

Optic Atrophies, Hereditary - Hereditary conditions that feature progressive visual loss in association with optic atrophy. Relati...

Optic Atrophy - Atrophy of the optic disk which may be congenital or acquired. This condition indicates a deficiency...

Optic Atrophy, Autosomal Dominant - Dominant optic atrophy is a hereditary optic neuropathy causing decreased visual acuity, color visio...

Optic Atrophy, Hereditary, Leber - A maternally linked genetic disorder that presents in mid-life as acute or subacute central vision l...

Optic Chiasm - The X-shaped structure formed by the meeting of the two optic nerves. At the optic chiasm the fibers...

Optic Disk - The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeti...

Optic Disk Drusen - Optic disk bodies composed primarily of acid mucopolysaccharides that may produce pseudopapilledema ...

Optic Lobe, Nonmammalian - In invertebrate zoology, a lateral lobe of the FOREBRAIN in certain ARTHROPODS. In vertebrate zoolog...

Optic Nerve - The 2nd cranial nerve. The optic nerve conveys visual information from the retina to the brain. The ...

Optic Nerve Diseases - Conditions which produce injury or dysfunction of the second cranial or optic nerve, which is genera...

Optic Nerve Glioma - Glial cell derived tumors arising from the optic nerve, usually presenting in childhood. Roughly 50%...

Optic Nerve Injuries - Injuries to the optic nerve induced by a trauma to the face or head. These may occur with closed or ...

Optic Nerve Neoplasms - Benign and malignant neoplasms that arise from the optic nerve or its sheath. OPTIC NERVE GLIOMA is ...

Optic Neuritis - Inflammation of the optic nerve. Commonly associated conditions include autoimmune disorders such as...

Optic Neuropathy, Ischemic - Ischemic injury to the OPTIC NERVE which usually affects the OPTIC DISK (optic neuropathy, anterior ...

Optical Devices - Products or parts of products used to detect, manipulate, or analyze light, such as LENSES, refracto...

Optical Fibers - Thin strands of transparent material, usually glass, that are used for transmitting light waves over...

Optical Illusions - An illusion of vision usually affecting spatial relations....

Optical Phenomena - LIGHT, it's processes and properties, and the characteristics of materials interacting with it....

Optical Processes - Behavior of LIGHT and its interactions with itself and materials....

Optical Restriction Mapping - A technique to generate restriction maps from single large DNA molecules by spreading the DNA onto a...

Optical Rotation - The rotation of linearly polarized light as it passes through various media....

Optical Rotatory Dispersion - The method of measuring the dispersion of an optically active molecule to determine the relative mag...

Optical Storage Devices - A computer disk read by a laser beam, containing data prerecorded by a vendor. The buyer cannot ente...

Optical Tweezers - A technique that uses LASERS to trap, image, and manipulate small objects (biomolecules, supramolecu...

Optics and Photonics - A specialized field of physics and engineering involved in studying the behavior and properties of l...

Optometry - The professional practice of primary eye and vision care that includes the measurement of visual ref...

Opuntia - A plant genus of the family CACTACEAE. Species with cylindrical joints are called Cholla; flat joint...

Oral Fistula - An abnormal passage within the mouth communicating between two or more anatomical structures....

Oral Health - The optimal state of the mouth and normal functioning of the organs of the mouth without evidence of...

Oral Hemorrhage - Bleeding from the blood vessels of the mouth, which may occur as a result of injuries to the mouth, ...

Oral Hygiene - The practice of personal hygiene of the mouth. It includes the maintenance of oral cleanliness, tiss...

Oral Hygiene Index - A combination of the debris index and the dental calculus index to determine the status of oral hygi...

Oral Manifestations - Disorders of the mouth attendant upon non-oral disease or injury....

Oral Medicine - A branch of dentistry dealing with diseases of the oral and paraoral structures and the oral managem...

Oral Stage - The earliest of the stages of infantile psychosexual development, lasting from birth to 12 months or...

Oral Surgical Procedures - Procedures used to treat disease, injuries, and defects of the oral and maxillofacial region....

Oral Surgical Procedures, Preprosthetic - Surgery necessary for a denture to rest on a firm base, free from marked osseous protuberances or un...

Oral Ulcer - A loss of mucous substance of the mouth showing local excavation of the surface, resulting from the ...

Orbit - Bony cavity that holds the eyeball and its associated tissues and appendages....

Orbit Evisceration - The surgical removal of the contents of the orbit. This includes the eyeball, blood vessels, muscles...

Orbital Cellulitis - Inflammation of the loose connective tissues around the ORBIT, bony structure around the eyeball. It...

Orbital Diseases - Diseases of the bony orbit and contents except the eyeball....

Orbital Fractures - Fractures of the bones in the orbit, which include parts of the frontal, ethmoidal, lacrimal, and sp...

Orbital Implants - Rounded objects made of coral, teflon, or alloplastic polymer and covered with sclera, and which are...

Orbital Myositis - Inflammation of the extraocular muscle of the eye. It is characterized by swelling which can lead to...

Orbital Neoplasms - Neoplasms of the bony orbit and contents except the eyeball....

Orbital Pseudotumor - A nonspecific tumor-like inflammatory lesion in the ORBIT of the eye. It is usually composed of matu...

Orbivirus - A genus of REOVIRIDAE infecting a wide range of arthropods and vertebrates including humans. It comp...

Orchidaceae - A plant family of the order Orchidales, subclass Liliidae, class Liliopsida (monocotyledons). All o...

Orchiectomy - The surgical removal of one or both testicles....

Orchiopexy - A surgical procedure in which an undescended testicle is sutured inside the SCROTUM in male infants ...

Orchitis - Inflammation of a TESTIS. It has many features of EPIDIDYMITIS, such as swollen SCROTUM; PAIN; PYURI...

Orciprenaline - A beta-adrenergic agonist used in the treatment of asthma and bronchospasms....

Orf virus - The type species of PARAPOXVIRUS which causes a skin infection in natural hosts, usually young sheep...

Organ Culture Techniques - A technique for maintenance or growth of animal organs in vitro. It refers to three-dimensional cult...

Organ of Corti - The spiral EPITHELIUM containing sensory AUDITORY HAIR CELLS and supporting cells in the cochlea. Or...

Organ Preservation - The process by which organs are kept viable outside of the organism from which they were removed (i....

Organ Preservation Solutions - Solutions used to store organs and minimize tissue damage, particularly while awaiting implantation....

Organ Size - The measurement of an organ in volume, mass, or heaviness....

Organ Specificity - Characteristic restricted to a particular organ of the body, such as a cell type, metabolic response...

Organ Transplantation - Transference of an organ between individuals of the same species or between individuals of different...

Organelle Shape - The quality of surface form or outline of ORGANELLES....

Organelle Size - The quantity of volume or surface area of ORGANELLES....

Organelles - Specific particles of membrane-bound organized living substances present in eukaryotic cells, such a...

Organic Anion Transport Polypeptide C - An organic anion transporter found in human liver. It is capable of transporting a variety organic a...

Organic Anion Transport Protein 1 - A polyspecific transporter for organic cations found primarily in the kidney. It mediates the couple...

Organic Anion Transporters - Proteins involved in the transport of organic anions. They play an important role in the elimination...

Organic Anion Transporters, ATP-Dependent - A subclass of ORGANIC ANION TRANSPORTERS whose transport of organic anions is linked directly to the...

Organic Anion Transporters, Sodium-Dependent - A subclass of ORGANIC ANION TRANSPORTERS whose transport of organic anions is driven either directly...

Organic Anion Transporters, Sodium-Independent - A subclass of ORGANIC ANION TRANSPORTERS that do not rely directly or indirectly upon sodium ion gra...

Organic Cation Transport Proteins - A family of proteins involved in the transport of organic cations. They play an important role in th...

Organic Cation Transporter 1 - An organic cation transporter found in kidney. It is localized to the basal lateral membrane and is ...

Organic Chemicals - A broad class of substances containing carbon and its derivatives. Many of these chemicals will freq...

Organic Chemistry Phenomena - The conformation, properties, reaction processes, and the properties of the reactions of carbon comp...

Organic Chemistry Processes - The reactions, changes in structure and composition, the properties of the reactions of carbon compo...

Organism Forms - Specific states or life cycle stages of organisms. These include post-embryonic stages of insects, s...

Organisms, Genetically Modified - Organisms whose GENOME has been changed by a GENETIC ENGINEERING technique....

Organization and Administration - The planning and managing of programs, services, and resources....

Organizational Affiliation - Formal relationships established between otherwise independent organizations. These include affiliat...

Organizational Case Studies - Descriptions and evaluations of specific health care organizations....

Organizational Culture - Beliefs and values shared by all members of the organization. These shared values are reflected in t...

Organizational Innovation - Introduction of changes which are new to the organization and are created by management....

Organizational Objectives - The purposes, missions, and goals of an individual organization or its units, established through ad...

Organizational Policy - A course or method of action selected, usually by an organization, institution, university, society,...

Organizations - Administration and functional structures for the purpose of collectively systematizing activities fo...

Organizations, Nonprofit - Organizations which are not operated for a profit and may be supported by endowments or private cont...

Organizers, Embryonic - Cells in certain regions of an embryo that self-regulate embryonic development. These organizers hav...

Organogenesis - Formation of differentiated cells and complicated tissue organization to provide specialized functio...

Organogold Compounds - Organic compounds that contain GOLD as an integral part of the molecule. Some are used as ANTIRHEUMA...

Organoids - An organization of cells into an organ-like structure. Organoids can be generated in culture. They a...

Organomercury Compounds - Organic compounds which contain mercury as an integral part of the molecule....

Organometallic Compounds - A class of compounds of the type R-M, where a C atom is joined directly to any other element except ...

Organophosphorus Compounds - Organic compounds that contain phosphorus as an integral part of the molecule. Included under this h...

Organoplatinum Compounds - Organic compounds which contain platinum as an integral part of the molecule....

Organoselenium Compounds - Organic compounds which contain selenium as an integral part of the molecule....

Organosilicon Compounds - Organic compounds that contain silicon as an integral part of the molecule....

Organotechnetium Compounds - Organic compounds that contain technetium as an integral part of the molecule. These compounds are o...

Organotherapy - Historically, the treatment of disease by the administration of animal organs or their extracts (aft...

Organothiophosphorus Compounds - Compounds containing carbon-phosphorus bonds in which the phosphorus component is also bonded to one...

Organotin Compounds - Organic compounds which contain tin in the molecule. Used widely in industry and agriculture....

Orgasm - The crisis of sexual excitement in either humans or animals....

Orientation - Awareness of oneself in relation to time, place and person....

Orientia tsutsugamushi - A gram-negative, rod-shaped to coccoid bacterium. It is the etiologic agent of SCRUB TYPHUS in human...

Origanum - A plant genus of the family LAMIACEAE that is the source of a familiar food seasoning....

Origin Recognition Complex - The origin recognition complex is a multi-subunit DNA-binding protein that initiates DNA REPLICATION...

Ornidazole - A nitroimidazole antiprotozoal agent used in ameba and trichomonas infections. It is partially plasm...

Ornipressin - A synthetic analog of vasopressin with ORNITHINE substitution at residue 8 of the cyclic nonapeptide...

Ornithine - An amino acid produced in the urea cycle by the splitting off of urea from arginine....

Ornithine Carbamoyltransferase - A urea cycle enzyme that catalyzes the formation of orthophosphate and L-citrulline (CITRULLINE) fro...

Ornithine Carbamoyltransferase Deficiency Disease - An inherited urea cycle disorder associated with deficiency of the enzyme ORNITHINE CARBAMOYLTRANSFE...

Ornithine Decarboxylase - A pyridoxal-phosphate protein, believed to be the rate-limiting compound in the biosynthesis of poly...

Ornithine-Oxo-Acid Transaminase - A pyridoxal phosphate enzyme that catalyzes the formation of glutamate gamma-semialdehyde and an L-a...

Ornithobacterium - A genus of gram-negative, chemoorganotrophic bacteria, in the family FLAVOBACTERIACEAE. It is pathog...

Ornithodoros - A genus of softbacked TICKS, in the family ARGASIDAE, serving as the vector of BORRELIA, causing REL...

Ornithogalum - A plant genus of the family LILIACEAE that contains cholestane glycosides (CHOLESTANES)....

Oroantral Fistula - A fistula between the maxillary sinus and the oral cavity....

Orobanchaceae - The broom-rape plant family of the order Scrophulariales, subclass Asteridae, class Magnoliopsida....

Orobanche - A plant genus of the family OROBANCHACEAE. Lacking chlorophyll, they are nonphotosynthetic parasitic...

Orofaciodigital Syndromes - Two syndromes of oral, facial, and digital malformations. Type I (Papillon-Leage and Psaume syndrome...

Oropharyngeal Neoplasms - Tumors or cancer of the OROPHARYNX....

Oropharynx - The middle portion of the pharynx that lies posterior to the mouth, inferior to the SOFT PALATE, and...

Orotate Phosphoribosyltransferase - The enzyme catalyzing the formation of orotidine-5'-phosphoric acid (orotidylic acid) from orotic ac...

Orotidine-5'-Phosphate Decarboxylase - Orotidine-5'-phosphate carboxy-lyase. Catalyzes the decarboxylation of orotidylic acid to yield urid...

Orphan Drug Production - Production of drugs or biologicals which are unlikely to be manufactured by private industry unless ...

Orphan Nuclear Receptors - A broad category of receptor-like proteins that may play a role in transcriptional-regulation in the...

Orphanages - Institutions for the housing and care of orphans, foundlings, and abandoned children. They have exis...

Orphenadrine - A muscarinic antagonist used to treat drug-induced parkinsonism and to relieve pain from muscle spas...

Orthobunyavirus - A genus of the family BUNYAVIRIDAE containing over 150 viruses, most of which are transmitted by mos...

Orthodontic Anchorage Procedures - Attachment of orthodontic devices and materials to the MOUTH area for support and to provide a count...

Orthodontic Appliance Design - The planning, calculation, and creation of an apparatus for the purpose of correcting the placement ...

Orthodontic Appliances - Devices used for influencing tooth position. Orthodontic appliances may be classified as fixed or re...

Orthodontic Appliances, Functional - Loose, usually removable intra-oral devices which alter the muscle forces against the teeth and cran...

Orthodontic Brackets - Small metal or ceramic attachments used to fasten an arch wire. These attachments are soldered or we...

Orthodontic Extrusion - Orthodontic movement in the coronal direction achieved by outward tension on the PERIODONTAL LIGAMEN...

Orthodontic Retainers - Orthodontic appliances, fixed or removable, used to maintain teeth in corrected positions during the...

Orthodontic Space Closure - Therapeutic closure of spaces caused by the extraction of teeth, the congenital absence of teeth, or...

Orthodontic Wires - Wires of various dimensions and grades made of stainless steel or precious metal. They are used in o...

Orthodontics - A dental specialty concerned with the prevention and correction of dental and oral anomalies (malocc...

Orthodontics, Corrective - The phase of orthodontics concerned with the correction of malocclusion with proper appliances and p...

Orthodontics, Interceptive - Recognition and elimination of potential irregularities and malpositions in the developing dentofaci...

Orthognathic Surgical Procedures - Surgery performed to repair or correct the skeletal anomalies of the jaw and its associated dental a...

Orthohepadnavirus - A genus of HEPADNAVIRIDAE causing hepatitis in humans, woodchucks ( HEPATITIS B VIRUS, WOODCHUCK) a...

Orthokeratologic Procedures - An alternative to REFRACTIVE SURGICAL PROCEDURES. A therapeutic procedure for correcting REFRACTIVE ...

Orthomolecular Therapy - The use of very large doses of vitamins or other naturally occurring substances normally present in ...

Orthomyxoviridae - A family of RNA viruses causing INFLUENZA and other diseases. There are five recognized genera: INFL...

Orthomyxoviridae Infections - Virus diseases caused by the ORTHOMYXOVIRIDAE....

Orthopedic Equipment - Nonexpendable items used in the performance of orthopedic surgery and related therapy. They are diff...

Orthopedic Fixation Devices - Devices which are used in the treatment of orthopedic injuries and diseases....

Orthopedic Nursing - The specialty or practice of nursing in the care of the orthopedic patient....

Orthopedic Procedures - Procedures used to treat and correct deformities, diseases, and injuries to the MUSCULOSKELETAL SYST...

Orthopedics - A surgical specialty which utilizes medical, surgical, and physical methods to treat and correct def...

Orthopoxvirus - A genus of the family POXVIRIDAE, subfamily CHORDOPOXVIRINAE, comprising many species infecting mamm...

Orthopsychiatry - The study and treatment of human behavior problems utilizing principles derived from the behavioral,...

Orthoptera - An order of insects comprising two suborders: Caelifera and Ensifera. They consist of GRASSHOPPERS, ...

Orthoptics - The study and treatment of defects in binocular vision resulting from defects in the optic musculatu...

Orthoreovirus - A genus of the family REOVIRIDAE infecting vertebrates only. Transmission is horizontal and infected...

Orthoreovirus, Avian - A species of ORTHOREOVIRUS infecting birds, with outcomes ranging from inapparent to lethal dependin...

Orthoreovirus, Mammalian - A species of ORTHOREOVIRUS infecting mammals (other than baboons). There are four serotypes. In huma...

Orthosiphon - A plant genus of the family LAMIACEAE that contains pimarane-type diterpenes....

Orthostatic Intolerance - Symptoms of cerebral hypoperfusion or autonomic overaction which develop while the subject is standi...

Orthotic Devices - Apparatus used to support, align, prevent, or correct deformities or to improve the function of mova...

Oryza sativa - Annual cereal grass of the family POACEAE and its edible starchy grain, rice, which is the staple fo...

Oryzias - The only genus in the family Oryziinae, order BELONIFORMES. Oryzias are egg-layers; other fish of th...

Oscillatoria - A genus of filamentous CYANOBACTERIA in the order Oscillatoriales. It is commonly found in freshwate...

Oscillometry - The measurement of frequency or oscillation changes....

Oseltamivir - An acetamido cyclohexene that is a structural homolog of SIALIC ACID and inhibits NEURAMINIDASE....

Osmeriformes - An order of fish including smelts, galaxiids, and salamanderfish....

Osmium - Osmium. A very hard, gray, toxic, and nearly infusible metal element, atomic number 76, atomic weigh...

Osmium Compounds - Inorganic compounds that contain osmium as an integral part of the molecule....

Osmium Tetroxide - (T-4)-Osmium oxide (OsO4). A highly toxic and volatile oxide of osmium used in industry as an oxidiz...

Osmolar Concentration - The concentration of osmotically active particles in solution expressed in terms of osmoles of solut...

Osmosis - Tendency of fluids (e.g., water) to move from the less concentrated to the more concentrated side of...

Osmotic Fragility - RED BLOOD CELL sensitivity to change in OSMOTIC PRESSURE. When exposed to a hypotonic concentration ...

Osmotic Pressure - The pressure required to prevent the passage of solvent through a semipermeable membrane that separa...

Osseointegration - The growth action of bone tissue, as it assimilates surgically implanted devices or prostheses to be...

Ossicular Prosthesis - An implant used to replace one or more of the ear ossicles. They are usually made of plastic, Gelfoa...

Ossicular Replacement - Surgical insertion of an implant to replace one or more of the ear ossicles....

Ossification of Posterior Longitudinal Ligament - A calcification of the posterior longitudinal ligament of the spinal column, usually at the level of...

Ossification, Heterotopic - The development of bony substance in normally soft structures....

Osteitis Deformans - A disease marked by repeated episodes of increased bone resorption followed by excessive attempts at...

Osteitis Fibrosa Cystica - A fibrous degeneration, cyst formation, and the presence of fibrous nodules in bone, usually due to ...

Osteoarthritis - A progressive, degenerative joint disease, the most common form of arthritis, especially in older pe...

Osteoarthritis, Hip - Noninflammatory degenerative disease of the hip joint which usually appears in late middle or old ag...

Osteoarthritis, Knee - Noninflammatory degenerative disease of the knee joint consisting of three large categories: conditi...

Osteoarthritis, Spine - A degenerative joint disease involving the SPINE. It is characterized by progressive deterioration o...

Osteoarthropathy, Primary Hypertrophic - A conditioned chiefly characterized by thickening of the skin of the head and distal extremities, de...

Osteoarthropathy, Secondary Hypertrophic - Symmetrical osteitis of the four limbs, chiefly localized to the phalanges and the terminal epiphyse...

Osteoblastoma - A benign, painful, tumor of bone characterized by the formation of osteoid tissue, primitive bone an...

Osteoblasts - Bone-forming cells which secrete an EXTRACELLULAR MATRIX. HYDROXYAPATITE crystals are then deposited...

Osteocalcin - Vitamin K-dependent calcium-binding protein synthesized by OSTEOBLASTS and found primarily in BONES....

Osteochondritis - Inflammation of a bone and its overlaying CARTILAGE....

Osteochondritis Dissecans - A type of osteochondritis in which articular cartilage and associated bone becomes partially or tota...

Osteochondrodysplasias - Abnormal development of cartilage and bone....

Osteochondroma - A cartilage-capped benign tumor that often appears as a stalk on the surface of bone. It is probably...

Osteochondromatosis - A condition marked by the presence of multiple osteochondromas. (Dorland, 27th ed)...

Osteochondrosis - Any of a group of bone disorders involving one or more ossification centers (EPIPHYSES). It is chara...

Osteoclasts - A large multinuclear cell associated with the BONE RESORPTION. An odontoclast, also called cementocl...

Osteocytes - Mature osteoblasts that have become embedded in the BONE MATRIX. They occupy a small cavity, called ...

Osteogenesis - The process of bone formation. Histogenesis of bone including ossification....

Osteogenesis Imperfecta - Autosomal dominant COLLAGEN DISEASES resulting from defective biosynthesis of COLLAGEN TYPE I and ch...

Osteogenesis, Distraction - Bone lengthening by gradual mechanical distraction. An external fixation device produces the distrac...

Osteolysis - Dissolution of bone that particularly involves the removal or loss of calcium....

Osteolysis, Essential - Syndromes of bone destruction where the cause is not obvious such as neoplasia, infection, or trauma...

Osteoma - A benign tumor composed of bone tissue or a hard tumor of bonelike structure developing on a bone (h...

Osteoma, Osteoid - Benign circumscribed tumor of spongy bone occurring especially in the bones of the extremities and v...

Osteomalacia - A condition marked by softening of the bones (due to impaired mineralization, with excess accumulati...

Osteonecrosis - Death of a bone or part of a bone, either atraumatic or posttraumatic....

Osteonectin - Non-collagenous, calcium-binding glycoprotein of developing bone. It links collagen to mineral in th...

Osteopathic Medicine - A medical discipline that is based on the philosophy that all body systems are interrelated and depe...

Osteopathic Physicians - Licensed physicians trained in OSTEOPATHIC MEDICINE. An osteopathic physician, also known as D.O. (D...

Osteopetrosis - Excessive formation of dense trabecular bone leading to pathological fractures; OSTEITIS; SPLENOMEGA...

Osteophyte - Bony outgrowth usually found around joints and often seen in conditions such as ARTHRITIS....

Osteopoikilosis - An asymptomatic, autosomal dominant trait in which pea-sized sclerotic spots, prominent in the metap...

Osteopontin - A negatively-charged extracellular matrix protein that plays a role in the regulation of BONE metabo...

Osteoporosis - Reduction of bone mass without alteration in the composition of bone, leading to fractures. Primary ...

Osteoporosis, Postmenopausal - Metabolic disorder associated with fractures of the femoral neck, vertebrae, and distal forearm. It ...

Osteoprotegerin - A secreted member of the TNF receptor superfamily that negatively regulates osteoclastogenesis. It i...

Osteoradionecrosis - Necrosis of bone following radiation injury....

Osteosarcoma - A sarcoma originating in bone-forming cells, affecting the ends of long bones. It is the most common...

Osteosarcoma, Juxtacortical - A form of osteogenic sarcoma of relatively low malignancy, probably arising from the periosteum and ...

Osteosclerosis - An abnormal hardening or increased density of bone tissue....

Osteotomy - The surgical cutting of a bone. (Dorland, 28th ed)...

Osteotomy, Le Fort - Transverse sectioning and repositioning of the maxilla. There are three types: Le Fort I osteotomy f...

Ostertagia - A genus of parasitic nematodes occurring in the stomach of ruminants....

Ostertagiasis - A disease of herbivorous mammals, particularly cattle and sheep, caused by stomach worms of the genu...

Ostomy - Surgical construction of an artificial opening (stoma) for external fistulization of a duct or vesse...

Ostrea - A genus of oysters in the family OSTREIDAE, which includes the edible true oyster, Ostrea edulis....

Ostreidae - A family of marine mollusks in the class BIVALVIA, commonly known as oysters. They have a rough irre...

Otitis - Inflammation of the ear, which may be marked by pain (EARACHE), fever, HEARING DISORDERS, and VERTIG...

Otitis Externa - Inflammation of the OUTER EAR including the external EAR CANAL, cartilages of the auricle (EAR CARTI...

Otitis Media - Inflammation of the MIDDLE EAR including the AUDITORY OSSICLES and the EUSTACHIAN TUBE....

Otitis Media with Effusion - Inflammation of the middle ear with a clear pale yellow-colored transudate....

Otitis Media, Suppurative - Inflammation of the middle ear with purulent discharge....

Otoacoustic Emissions, Spontaneous - Self-generated faint acoustic signals from the inner ear (COCHLEA) without external stimulation. The...

Otolaryngology - A surgical specialty concerned with the study and treatment of disorders of the ear, nose, and throa...

Otolithic Membrane - A gelatinous membrane overlying the acoustic maculae of SACCULE AND UTRICLE. It contains minute crys...

Otologic Surgical Procedures - Surgery performed on the external, middle, or internal ear....

Otorhinolaryngologic Diseases - Pathological processes of the ear, the nose, and the throat, also known as the ENT diseases....

Otorhinolaryngologic Neoplasms - A general concept for tumors or cancer of any part of the EAR; the NOSE; the THROAT; and the PHARYNX...

Otorhinolaryngologic Surgical Procedures - Surgery performed on the ear and its parts, the nose and nasal cavity, or the throat, including surg...

Otosclerosis - Formation of spongy bone in the labyrinth capsule which can progress toward the STAPES (stapedial fi...

Otoscopes - Instruments designed to inspect or auscultate the ear. They are designed primarily to examine the ou...

Otoscopy - Examination of the EAR CANAL and eardrum with an OTOSCOPE....

Otters - Fish-eating carnivores of the family MUSTELIDAE, found on both hemispheres....

Ottoman Empire - A sultanate comprised at various times of parts of EUROPE, ASIA, and AFRICA. Its period extends gene...

Otx Transcription Factors - A family of VERTEBRATE homeodomain proteins that share homology with orthodenticle protein, Drosophi...

Ouabain - A cardioactive glycoside consisting of rhamnose and ouabagenin, obtained from the seeds of Strophant...

Outcome and Process Assessment (Health Care) - Evaluation procedures that focus on both the outcome or status (OUTCOMES ASSESSMENT) of the patient ...

Outcome Assessment (Health Care) - Research aimed at assessing the quality and effectiveness of health care as measured by the attainme...

Outliers, DRG - In health care reimbursement, especially in the prospective payment system, those patients who requi...

Outlines - Works consisting of brief statements of the principal elements of a subject, usually arranged by hea...

Outpatient Clinics, Hospital - Organized services in a hospital which provide medical care on an outpatient basis....

Outpatients - Persons who receive ambulatory care at an outpatient department or clinic without room and board bei...

Outsourced Services - Organizational activities previously performed internally that are provided by external agents....

Oval Window, Ear - Fenestra or oval opening on the lateral wall of the vestibular labyrinth adjacent to the MIDDLE EAR....

Ovalbumin - An albumin obtained from the white of eggs. It is a member of the serpin superfamily....

Ovarian Cysts - General term for CYSTS and cystic diseases of the OVARY....

Ovarian Diseases - Pathological processes of the OVARY....

Ovarian Failure, Premature - Cessation of ovarian function after MENARCHE but before the age of 40, without or with OVARIAN FOLLI...

Ovarian Follicle - An OOCYTE-containing structure in the cortex of the OVARY. The oocyte is enclosed by a layer of GRAN...

Ovarian Function Tests - Methods used for assessment of ovarian function....

Ovarian Hyperstimulation Syndrome - A complication of OVULATION INDUCTION in infertility treatment. It is graded by the severity of symp...

Ovarian Neoplasms - Tumors or cancer of the OVARY. These neoplasms can be benign or malignant. They are classified accor...

Ovariectomy - The surgical removal of one or both ovaries....

Ovary - The reproductive organ (GONADS) in female animals. In vertebrates, the ovary contains two functional...

Overall - A single citation covering several articles of various degrees of specificity or a single citation c...

Overdose - An accidental or deliberate dose of a medication or street drug that is in excess of what is normall...

Overlearning - Learning in which practice proceeds beyond the point where the act can just be performed with the re...

Overnutrition - An imbalanced nutritional status resulted from excessive intake of nutrients. Generally, overnutriti...

Overweight - A status with BODY WEIGHT that is above certain standard of acceptable or desirable weight. In the s...

Oviducts - Ducts that serve exclusively for the passage of eggs from the ovaries to the exterior of the body. I...

Oviparity - The capability of producing eggs (OVA) from which young are hatched outside the body. While mostly r...

Oviposition - The process of laying or shedding fully developed eggs (OVA) from the female body. The term is usual...

Ovomucin - A heterogeneous mixture of glycoproteins responsible for the gel structure of egg white. It has tryp...

Ovoviviparity - The capability of producing yolk-filled eggs that hatch within the body, so that the young are born ...

Ovulation - The discharge of an OVUM from a rupturing follicle in the OVARY....

Ovulation Detection - Method to determine the occurrence of OVULATION by direct or indirect means. Indirect methods examin...

Ovulation Induction - Techniques for the artifical induction of ovulation, the rupture of the follicle and release of the ...

Ovulation Inhibition - Blocking the process leading to OVULATION. Various factors are known to inhibit ovulation, such as n...

Ovulation Prediction - Predicting the time of OVULATION can be achieved by measuring the preovulatory elevation of ESTRADIO...

Ovule - The element in plants that contains the female GAMETOPHYTES....

Ovum - A mature haploid female germ cell extruded from the OVARY at OVULATION....

Ovum Transport - Transport of the OVUM or fertilized ovum (ZYGOTE) from the mammalian oviduct (FALLOPIAN TUBES) to th...

Ownership - The legal relation between an entity (individual, group, corporation, or-profit, secular, government...

OX40 Ligand - A membrane-bound tumor necrosis family member that is expressed on activated antigen-presenting cell...

Oxacillin - An antibiotic similar to FLUCLOXACILLIN used in resistant staphylococci infections....

Oxalates - Salts and esters of OXALIC ACID....

Oxalic Acid - A strong dicarboxylic acid occurring in many plants and vegetables. It is produced in the body by me...

Oxalic Acids - Acids, salts, and derivatives of OXALIC ACID....

Oxaloacetate - An anionic form of oxaloacetic acid....

Oxaloacetates - Salts and esters of oxaloacetic acid....

Oxaloacetic Acids - A class of ketodicarboxylic acids derived from oxalic acid. Oxaloacetic acid is an intermediate in t...

Oxalobacter formigenes - The sole species of the genus Oxalobacter consisting of straight or curved gram-negative rods with r...

Oxalobacteraceae - A family of gram-negative bacteria in the class BETAPROTEOBACTERIA. There are at least eight genera....

Oxamic Acid - Amino-substituted glyoxylic acid derivative....

Oxamniquine - An anthelmintic with schistosomicidal activity against Schistosoma mansoni, but not against other Sc...

Oxandrolone - A synthetic hormone with anabolic and androgenic properties....

Oxazepam - A benzodiazepine used in the treatment of anxiety, alcohol withdrawal, and insomnia....

Oxazines - Six-membered heterocycles containing an oxygen and a nitrogen....

Oxazocines - One ring heterocyclic compounds defined by C6H7NO. Permitted are any degree of hydrogenation, any su...

Oxazoles - Five-membered heterocyclic ring structures containing an oxygen in the 1-position and a nitrogen in ...

Oxazolidinones - Derivatives of oxazolidin-2-one. They represent an important class of synthetic antibiotic agents....

Oxazolone - Immunologic adjuvant and sensitizing agent....

Oxepins - Compounds based on a 7-membered heterocyclic ring including an oxygen. They can be considered a medi...

Oxidants - Oxidizing agents or electron-accepting molecules in chemical reactions in which electrons are transf...

Oxidants, Photochemical - Compounds that accept electrons in an oxidation-reduction reaction. The reaction is induced by or ac...

Oxidation-Reduction - A chemical reaction in which an electron is transferred from one molecule to another. The electron-d...

Oxidative Phosphorylation - Electron transfer through the cytochrome system liberating free energy which is transformed into hig...

Oxidative Stress - A disturbance in the prooxidant-antioxidant balance in favor of the former, leading to potential dam...

Oxides - Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkali...

Oxidopamine - A neurotransmitter analogue that depletes noradrenergic stores in nerve endings and induces a reduct...

Oxidoreductases - The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is rega...

Oxidoreductases Acting on Aldehyde or Oxo Group Donors - A broad category of oxidoreductases that either reduce double bonds or oxidize single bonds between ...

Oxidoreductases Acting on CH-CH Group Donors - A subclass of enzymes which includes all dehydrogenases acting on carbon-carbon bonds. This enzyme g...

Oxidoreductases Acting on CH-NH Group Donors - Enzymes catalyzing the dehydrogenation of secondary amines, introducing a C=N double bond as the pri...

Oxidoreductases Acting on CH-NH2 Group Donors - Enzymes catalyzing the dehydrogenation of or oxidation of compounds containing primary amines....

Oxidoreductases Acting on Sulfur Group Donors - Oxidoreductases with specificity for oxidation or reduction of SULFUR COMPOUNDS....

Oxidoreductases, O-Demethylating - Drug metabolizing enzymes which oxidize methyl ethers. Usually found in liver microsomes....

Oximes - Compounds that contain the radical R2C=N.OH derived from condensation of ALDEHYDES or KETONES with H...

Oximetry - The determination of oxygen-hemoglobin saturation of blood either by withdrawing a sample and passin...

Oxo-Acid-Lyases - Enzymes that catalyze the cleavage of a carbon-carbon bond of a 3-hydroxy acid. (Dorland, 28th ed) E...

Oxocins - Compounds based on an 8-membered heterocyclic ring including an oxygen. They can be considered mediu...

Oxolinic Acid - Synthetic antimicrobial related to NALIDIXIC ACID and used in URINARY TRACT INFECTIONS....

Oxonic Acid - Antagonist of urate oxidase....

Oxotremorine - A non-hydrolyzed muscarinic agonist used as a research tool....

Oxprenolol - A beta-adrenergic antagonist used in the treatment of hypertension, angina pectoris, arrhythmias, an...

Oxyclozanide - Anthelmintic used in grazing animals for fasciola and cestode infestations....

Oxycodone - Semisynthetic derivative of CODEINE that acts as a narcotic analgesic more potent and addicting than...

Oxyfedrine - A drug used in the treatment of angina pectoris, heart failure, conduction defects, and myocardial i...

Oxygen - An element with atomic symbol O, atomic number 8, and atomic weight 16. It is the most abundant elem...

Oxygen Compounds - Inorganic compounds that contain oxygen as an integral part of the molecule....

Oxygen Consumption - The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissu...

Oxygen Inhalation Therapy - Inhalation of oxygen aimed at restoring toward normal any pathophysiologic alterations of gas exchan...

Oxygen Isotopes - Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic wei...

Oxygen Radioisotopes - Unstable isotopes of oxygen that decay or disintegrate emitting radiation. O atoms with atomic weigh...

Oxygenases - Oxidases that specifically introduce DIOXYGEN-derived oxygen atoms into a variety of organic molecul...

Oxygenators - Devices which mechanically oxygenate venous blood extracorporeally. They are used in combination wit...

Oxygenators, Membrane - Devices in which blood and oxygen are separated by a semipermeable membrane, generally of Teflon or ...

Oxyhemoglobins - A compound formed by the combination of hemoglobin and oxygen. It is a complex in which the oxygen i...

Oxylipins - Eighteen-carbon cyclopentyl polyunsaturated fatty acids derived from ALPHA-LINOLENIC ACID via an oxi...

Oxymetazoline - A direct acting sympathomimetic used as a vasoconstrictor to relieve nasal congestion. (From Martind...

Oxymetholone - A synthetic hormone with anabolic and androgenic properties. It is used mainly in the treatment of a...

Oxymonadida - An order of EUKARYOTES found in the gut of termites and other insects that live on LIGNIN. MITOCHOND...

Oxymorphone - An opioid analgesic with actions and uses similar to those of MORPHINE, apart from an absence of cou...

Oxyntomodulin - A 37-amino acid peptide derived from the C-terminal of GLICENTIN. It is mainly produced by the INTES...

Oxyphenbutazone - A non-steroidal anti-inflammatory drug. Oxyphenbutazone eyedrops have been used abroad in the manage...

Oxyphenisatin Acetate - A laxative that undergoes enterohepatic circulation. It may cause jaundice....

Oxyphenonium - A quaternary ammonium anticholinergic agent with peripheral side effects similar to those of ATROPIN...

Oxyphil Cells - Large cells with small irregular nuclei and dense acidophilic granules due to the presence of abunda...

Oxypurinol - A xanthine oxidase inhibitor....

Oxyquinoline - An antiseptic with mild fungistatic, bacteriostatic, anthelmintic, and amebicidal action. It is also...

Oxytetracycline - A TETRACYCLINE analog isolated from the actinomycete STREPTOMYCES rimosus and used in a wide variety...

Oxythiamine - Thiamine antagonist, antimetabolite....

Oxytocics - Drugs that stimulate contraction of the myometrium. They are used to induce LABOR, OBSTETRIC at term...

Oxytocin - A nonapeptide hormone released from the neurohypophysis (PITUITARY GLAND, POSTERIOR). It differs fro...

Oxytricha - A genus of ciliate protozoa having a unique cursorial type of locomotion....

Oxytropis - A plant genus of the family FABACEAE. Members contain SWAINSONINE....

Oxyuriasis - Infection with nematodes of the superfamily OXYUROIDEA....

Oxyurida - An order of nematodes of the subclass SECERNENTEA. Its organisms are characterized by a single, vent...

Oxyurida Infections - Infections with nematodes of the order OXYURIDA....

Oxyuroidea - A superfamily of parasitic nematodes consisting of several genera. ENTEROBIUS, which occurs in human...

Ozone - An unstable triatomic form of oxygen, O3, that exists in the atmosphere in varying proportions. It i...