This is part of a collection of lists with the terms used in biological and medical research. Source: public domain CRISP Thesaurus maintained by the Office of Extramural Research at the National Institutes of Health [1] (http://crisp.cit.nih.gov/). Biology studies the variety of life (clockwise from top-left) E. coli, tree fern, gazelle, Goliath beetle Biology is the science of life (from the Greek words bios = life and logos = word). ... See drugs, medication, and pharmacology for substances that are used to treat patients. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ...

Lists of biomedical topics: | # | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z These are collection of lists with the terms used in biological and medical research. ... This is a list of terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ... This is part of a collection of lists with the terms used in biological and medical research. ...

o aminobenzoate -- O antigen -- O glycosidase -- O methyl DOPA -- O methylglucose -- O'nyong-nyong virus -- O(6) alkylguanine DNA alkyltransferase -- O(6) benzylguanine -- O(6) methylguanine DNA methyltransferase -- [[O,O-diethyl-S-[2(diethylamino)ethyl]phosphorothioate]] -- [[O-ethyl-S-[2(diethylamino)ethyl]ethylphosphonothioate]] -- [[O-ethyl-S-[2(diethylamino)ethyl]methylphosphonothioate]] -- [[O-ethyl-S-[2(diisopropylamino)ethyl]methylphosphonothioate]] -- O15 isotope -- O17 isotope -- O18 isotope -- OA -- OAF -- oat cell carcinoma -- oat sterile dwarf virus -- oats -- OAV (oculoauriculovertebral) dysplasia -- obesity -- object recognition -- object shape -- obsessive behavior -- obsessive compulsive disorder -- obsessive compulsive personality -- obsessive compulsive personality disorder -- obsidan -- obstetric anesthesia -- obstetric nursing -- obstetrics -- obstructive airway disease -- obstructive asymmetric septal hypertrophy -- obstructive lung disease (generalized) -- obstructive sleep apnea -- obzidan -- occipital cortex -- occipital lobe -- occupation -- occupational disease -- occupational disorder -- occupational hazard -- occupational health -- occupational psychology -- occupational safety -- occupational stressor -- occupational therapy -- OCD -- oceanic research -- ochratoxin -- Ockelbo virus -- OCP deficiency -- octopamine -- Octopus -- octreotide -- ocular herpes -- ocular hypotensive -- ocular lymphomatosis -- ocular tension -- ocular toxoplasmosis -- oculocerebrorenal syndrome -- oculocerebrorenal syndrome of Lowe -- oculomotor -- oculomotor nerve -- oculomotor nuclei -- oculomotor paralysis -- ODC -- odd toed hoofed mammal -- Oddi's sphincter -- odontalgia -- odontoblast -- odontogenesis -- odontogenic tumor -- odor -- odoratism -- OH -- ohmage -- oil -- ointment -- OKA -- okadaic acid -- OKT1 antigen -- OKT3 antigen -- OKT4 antigen -- OKT8 antigen -- olanzapine -- old age -- Old World monkey -- oleate -- olefin -- olfaction -- olfactory anesthesia -- olfactory bulb -- olfactory communication (animal) -- olfactory disorder -- olfactory epithelium -- olfactory gyrus -- olfactory lobe -- olfactory nerve -- olfactory nuclei -- olfactory pathway -- olfactory receptor -- olfactory stimulus -- olfactory threshold -- olfactory tract and trigone -- oligodendrocyte -- oligodendroglia -- oligodendroglioma -- oligomer (protein) -- oligomycin -- oligonucleotidase -- oligonucleotide -- oligopeptide -- oligosaccharide -- olivary body -- olivocochlear bundle -- olivopontocerebellar atrophy -- oltipraz -- omega 3 fatty acid -- omega 6 fatty acid -- omentum -- omeprazole -- ommochrome -- Onchocerca -- onchocerciasis -- onchocercosis -- oncofetal antigen -- oncogene -- oncogenic virus -- oncogenic viruslike particle -- oncology -- oncology nursing -- oncolysis -- Oncomelania -- oncoprotein -- oncoprotein p21 -- oncornavirus -- oncosuppressor gene -- ondansetron -- online computer -- only child -- onset age -- ontogeny -- oocyte -- oogenesis -- Oomycetes -- oophorectomy -- OP1 -- open field behavior -- open reading frame -- operant conditioning -- operating room -- operations research -- operon -- ophioaminoacid oxidase -- ophthalmic solution -- ophthalmoscopy -- ophthalmoxerosis -- opiate alkaloid -- opiate receptor -- opioid receptor -- opium -- opossum -- Oppenheim's disease -- opportunistic infection -- oppositional defiant disorder -- opsin -- opsin kinase -- opsonin -- optic atrophy -- optic chiasma -- optic cup -- optic decussation -- optic disc -- optic disk -- optic nerve -- optic nerve disorder -- optic nerve regeneration -- optic neuritis -- optic tectum -- optic tract -- optic trap -- optic tweezer -- optical coherence tomography -- optical communication -- optical data storage -- optical disc -- optical illusion -- optical polarization -- optical rotation -- optical rotatory dispersion -- optical tomography -- optics -- oral administration -- oral airflow measurement -- oral bacteria -- oral behavior -- oral cholecystography -- oral contraceptive -- oral facial pain -- oral facial restoration -- oral facial restoration material -- oral flora -- oral health -- oral leukoplakia -- oral mucosa -- oral pharyngeal -- oral pharyngeal disorder -- oral pharyngeal disorder diagnosis -- oral pharyngeal hyperplasia -- oral pharyngeal neoplasm -- oral pharyngeal surgery -- oral rehydration therapy -- oral tolerance -- oral tolerization -- orangutan -- Orbivirus -- orchidopexy -- orchiectomy -- orchiopexy -- orchitis -- orexin -- orexin A -- orexin B -- ORF -- Orf virus -- organ -- organ culture -- organ donor -- organ of Corti -- organ preservation -- organelle -- organelle movement -- organelle transplantation -- organic acid -- organic base -- organic brain syndrome -- organic chemical -- organic personality syndrome -- organism -- organochlorine insecticide -- organogenesis -- organometallic compound -- organophosphorus insecticide -- organosilicon compound -- oriental -- orientation -- originality -- orlistat -- ornithine -- ornithine aminotransferase deficiency -- ornithine carbamoyl phosphate deficiency -- ornithine carbamoyltransferase -- ornithine carbamoyltransferase deficiency -- ornithine decarboxylase -- ornithine oxoacid aminotransferase -- ornithine oxoacid transaminase -- ornithine transcarbamylase -- ornithine transcarbamylase deficiency -- ornithinemia -- Ornithodoros -- orofacial pain -- oropharyngeal -- oropharyngeal cancer -- oropharyngeal disorder -- oropharyngeal disorder diagnosis -- oropharyngeal hyperplasia -- oropharyngeal neoplasm -- oropharyngeal surgery -- oropharyngeal thrush -- oropharynx -- Oropouche virus -- orosomucoid -- orotate -- orotate phosphoribosyltransferase -- orotate phosphoribosyltransferase deficiency -- orotic aciduria -- orotidine 5 phosphate decarboxylase -- orotidine 5' phosphoate pyrophosphorylase -- orotidylic acid phosphorylase -- ORP33 -- orphan disease -- orphan drug -- orphanin FQ -- orthodontic prosthesis -- orthodontics -- Orthohepadnavirus -- Orthomyxoviridae -- Orthomyxoviridae disease -- orthomyxovirus infection -- orthopedic appliance -- orthopedic brace -- orthopedic freezing -- orthopedics -- Orthopoxvirus -- Orthoptera -- Orthoreovirus -- orthosis -- orthostatic hypotension -- orthotic material -- orthotics -- Oryza sativa -- Oryzias latipes -- oscillatory blood flow -- oscillography -- Osgood Schlatter disease -- osmium -- osmolality -- osmolarity -- osmoreceptor -- osmosis -- osmotic fragility blood test -- osmotic minipump -- osmotic pressure -- ossa faciei -- Osteichthyes -- osteitis -- osteitis deformans -- osteoarthritis -- osteoblast -- osteocalcin -- osteochondritis -- osteochondrosarcoma -- osteoclast -- osteoclast activating factor -- osteoclastic bone loss -- osteoclastogenesis inhibitory factor -- osteocyte -- osteogenesis -- osteogenesis imperfecta -- osteogenic protein -- osteogenic sarcoma -- osteoid sarcoma -- osteolytic sarcoma -- osteomalacia -- osteomyelitis -- osteon -- osteonectin -- osteopath -- osteopenia -- osteopetrosis -- osteopontin -- osteoporosis -- osteoprotegerin -- osteosarcoma -- osteosclerosis -- osteosclerosis congenita -- Ostracoda -- other phosphotransferase -- otitis media -- otoacoustic emission -- otoconia -- otocyst -- otolaryngologic surgery -- otolith -- otorhinolaryngology -- otosclerosis -- ototoxin -- ouabain -- outcome assessment -- outcomes research -- outer space -- outpatient care -- outreach -- outreach program -- oval cell -- ovalbumin -- ovalocytosis -- ovarian cancer -- ovarian cyst -- ovarian follicle -- ovarian neoplasm -- ovariectomy -- ovary -- ovary disorder -- ovary neoplasm -- ovary transplantation -- overdose -- overeating -- overpopulation -- overweight -- ovid -- oviduct -- ovine catarrhal fever virus -- OVLT (organum vasculosum of the lamina terminalis) -- ovomucin -- ovomucoid -- ovotransferrin -- ovulation -- ovulation detection -- ovulation prediction -- ovulation time -- ovum -- ovum transfer surgery -- owl -- owl monkey -- owl monkey herpesvirus -- owlet moth -- oxalate -- oxaliplatin -- oxaloacetate -- oxalosis -- oxandrolone -- oxazepam -- oxazine -- oxaziridine -- oxazole -- oxazolidinedione -- oxazolidone -- oxazolinone -- oxepane -- oxepin -- oxetane -- oxetanone -- oxidant -- oxidation -- oxidation reduction reaction -- oxidative metabolism -- oxidative phosphorylation -- oxidative stress -- oxide -- oxidized lipid -- oxidizing agent -- oxidoreductase -- oxidoreductase inhibitor -- oxime -- oximetry -- oxindole -- oxirane -- oxoacid lyase -- oxoglutarate decarboxylase -- oxoglutarate dehydrogenase -- oxoisomerase -- oxotremorine -- oxovincaleukoblastine -- Oxpentifylline -- oxygen -- oxygen administration -- oxygen compound -- oxygen consumption -- oxygen debt -- oxygen deficiency -- oxygen free radical -- oxygen generating oxidase -- oxygen microelectrode -- oxygen oxidase -- oxygen poisoning -- oxygen producing enzyme -- oxygen stress (breathing) -- oxygen tension -- oxygen therapy -- oxygen transport -- oxygenase -- oxygenous heterocyclic compound -- oxyhemoglobin -- oxymetholone -- oxymetry -- oxypurine -- oxypyrimidine -- oxysteroid -- oxytocic -- oxytocin -- oyster -- ozone -- A lipopolysaccharide (LPS) is a large molecule that contains both lipid and a carbohydrate. ... Oa is a fictional planet located at the center of the universe in DC Comics. ... Oat cell carcinoma is now referred to as the small cell carcinoma. ... Species References ITIS 41455 2002-09-22 Oats are the seeds of any of several cereal grains in the genus Avena. ... For other things named OCD, see OCD (disambiguation). ... Obsessive Compulsive Personality Disorder (OCPD) is a personality disorder that is characterized by a general psychological inflexibility, rigid conformity to rules and procedures, perfectionism, and excessive orderliness. ... Obstetrics (from the Latin obstare, to stand by) is the surgical specialty dealing with the care of a woman and her offspring during pregnancy, childbirth and the puerperium (the period shortly after birth). ... This article needs cleanup. ... The occipital lobes are the visual processing center of mammalian brains. ... Occupation may refer to: the principal activity (job or calling) that earns money for a person (see profession, business) the periods of time following a nations territory invasion by controlling enemy troops (see belligerent occupation) any activity that occupies an important portion of a persons attention (see fan... An occupational disease is any recognized chronic ailment that is known to occur in a given body of workers in a given industry at a rate far higher than occurs in the general population, and includes diseases that are only known among workers in a given industry and no-where... What is Occupational Therapy? Occupational therapy is skilled treatment that helps individuals achieve independence in all facets of their lives. ... For other things named OCD, see OCD (disambiguation). ... Families 14 in two suborders, see text. ... Somatostatin is a hormone. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The title given to this article is incorrect due to technical limitations. ... Odor receptors on the antennae of a Luna moth An odor (American English) or odour (Commonwealth English) is the object of perception of the sense of olfaction. ... Oh can refer to: The acronym OH, such as the state of Ohio. ... Oil is a generic term for organic liquids that are not miscible with water. ... Olanzapine (Zyprexa® or in a combination with fluoxetine as Symbyax®) was the second atypical antipsychotic to gain FDA approval and has become one of the most commonly used atypical antipsychotics. ... Old age consists of ages nearing the average lifespan of human beings, and thus the end of the human life cycle. ... Subfamilies Cercopithecinae - 11 genera Colobinae - 9 genera The Old World monkeys or Cercopithecidae are a group of primates, falling in the superfamily Cercopithecoidea in the clade Catarrhini. ... An olefin is an alklene hydrocarbon. ... Olfaction, the sense of smell, is the detection of chemicals dissolved in air (or, by animals that breathe water, in water). ... The olfactory bulb (1) is relatively large in the rabbit brain The olfactory bulb is a part of the brain that is a distinct outgrowth from the forebrain of mammals. ... The olfactory epithelium is a specialized epithelial tissue inside the nasal cavity that is involved in smell. ... The olfactory nerve is the first of twelve cranial nerves. ... Olfactory receptors are a type of G protein-coupled receptor in olfactory receptor neurons. ... Oligodendrocytes are a variety of neuroglia. ... Oligodendroglioma is a type of intracranial tumor. ... Oligonucleotides are short sequences of nucleotides (RNA or DNA), typically with twenty or fewer base pairs. ... Peptides are the family of molecules formed from the linking, in a defined order, of various amino acids. ... An oligosaccharide is a saccharide polymer containing a small number (typically three to six) of component sugars, also known as simple sugars. ... In anatomy, the olivary bodies or simply olives (Latin oliva) are a pair of prominent oval structures in the medulla oblongata, the lower portion of the brainstem. ... These are a group of diseases characterized by neuronal degeneration in the cerebellum, pontine nuclei, and inferior olive. ... Omega-3 fatty acids are polyunsaturated fatty acids found in certain fish tissues, and in vegetable sources such as flax seeds, walnuts, and canola oil. ... In higher vertebrates, the peritoneum is the membrane that forms the lining of the abdominal cavity - it covers most of the intra-abdominal organs. ... Omeprazole is a proton pump inhibitor used in the treatment of dyspepsia, peptic ulcer disease (PUD), GORD and Zollinger-Ellison syndrome. ... Onchocerciasis or river blindness is the worlds second leading infectious cause of blindness. ... An oncogene is a gene that can cause a cell to develop into a tumor cell, possibly resulting in cancer. ... Please refer to cancer for the biology of malignant disease, as well as a list of malignant diseases. ... An oncology nurse is a specialized nurse who cares for cancer patients. ... Ondansetron is a 5-HT3 receptor antagonist principally used as an antiemetic. ... Ontogeny (also ontogenesis or morphogenesis) describes the origin and the development of an organism from the fertilized egg to its mature form. ... The oocyte in animals is a female germ cell in the process of developing into a mature egg. ... Oogenesis refers to the process of formation, development, and maturation of a healthy oocyte (egg) in the ovary. ... Orders Lagenidiales Leptomitales Peronosporales Pythiales Rhipidiales Saprolegniales Sclerosporales Water moulds or Oomycetes are a group of filamentous protists, physically resembling fungi. ... Oophorectomy is the surgical removal of the ovaries of a female animal. ... An open reading frame or ORF is any sequence of DNA or RNA that can be (translation) into a protein. ... Operant conditioning, so named by psychologist B. F. Skinner, is the modification of behavior (the actions of animals) brought about by the consequences that follow upon the occurrence of the behavior. ... Operations research, operational research, or simply OR, is the use of mathematical models, statistics and algorithms to aid in decision-making. ... An operon is a group of genes including an operator, a common promoter, and one or more structural genes that are controlled as a unit to produce messenger RNA (mRNA). ... In medicine the ophthalmoscope was invented by Hermann von Helmholtz and is an instrument that is used to look into the human eye. ... Opioid receptors are a group of G-protein coupled receptors with opioids as ligands. ... Opium is a narcotic drug which is obtained from the unripe seed pods of the opium poppy . ... This article or section should be merged with Virginia_opossum The word opossum (usually pronounced without the leading O, or with only a very slight schwa) refers either to the Virginia Opossum in particular, or more generally to any of the other marsupials of magnorder Ameridelphia. ... Opportunistic infections are infections in immunodeficient patients caused by pathogens which are incapable of causing infection in immunocompetent individuals. ... A rhodopsin molecule in the cell membrane. ... An opsonin is any molecule that acts as a binding enhancer for the process of phagocytosis. ... Optic atrophy is a general term for a dysfunction of the optic nerve. ... The optic chiasm is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the left side of the brain, and vice versa. ... The optic disc is the point in the eye where the optic nerve enters the retina; it is not sensitive to light. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... Optic neuritis is the inflammation of the optic nerve that may cause a complete or partial loss of vision. ... The optic tract is a part of the visual system in the brain. ... Optical coherence tomography (OCT) is a coherent imaging technique, based on interferometry, where the light-echoes of biological tissue are detected and displayed. ... Optical communication is any form of telecommunication that uses light as the transmission medium. ... In computing, sound reproduction, and video, an optical disc is flat, circular, usually polycarbonate disc whereon data is stored. ... An optical illusion is any illusion that deceives the human visual system into perceiving something that is not present or incorrectly perceiving what is present. ... When polarized light is passed through a substance containing chiral molecules (or nonchiral molecules arranged asymmetrically), the direction of polarization can be changed. ... See also list of optical topics. ... Oral contraceptives are contraceptives which are taken orally and inhibit the bodys fertility by chemical means. ... Oral Rehydration Therapy, or ORT, is a simple, cheap, and effective treatment for diarrhea caused by, e. ... Species Pongo pygmaeus Pongo abelii Orangutans (also spelled orang utan, orang-utan, sometimes incorrectly orangutang) are two species of great apes with long arms and reddish, sometimes brown, hair native to Malaysia and Indonesia. ... Orchiopexy is surgery to move an undescended testicle into the scrotum. ... Castration, gelding, neutering, orchiectomy or orchidectomy is any action, surgical or otherwise, by which a biological male loses use of the testes. ... Orchiopexy is surgery to move an undescended testicle into the scrotum. ... Orchitis is the swelling of the testicles. ... Orexin is the common name given to a pair of hormones discovered in rat brains by Masashi Yanagisawa at a Howard Hughes Medical Institute-funded lab at the University of Texas. ... Orf is a viral disease found primarily in sheep and goats that is caused by a parapox virus. ... An organ is the following: In anatomy, an organ is a group of tissues which perform some function. ... Organ culture is a development from tissue culture methods of research, the organ culture is able to accurately model functions of an organ in various states and conditions by the use of the actual in vitro organ itself. ... Organ donation is the removal of specific tissues of the human body from a person who has recently died, or from a living donor, for the purpose of transplanting them into other persons. ... A cross section of the cochlea illustrating the Organ of Corti. ... In cell biology, an organelle is one of several structures with specialized functions, suspended in the cytoplasm of a eukaryotic cell. ... An organic acid is an organic compound that is an acid. ... An organic compound is any of a large class of chemical compounds whose molecules contain carbon, with exception of carbides, carbonates and carbon oxides. ... In biology and ecology, an organism (in Greek organon = instrument) is a living being. ... Organogenesis is a stage of animal development where the ectoderm, endoderm, and mesoderm are formed. ... An organometallic compound is partially characterized by the presence of one or more metal-carbon bonds, in which the carbon involved would, apart from the metal-carbon bond, be otherwise considered a part of an organic compound. ... Oriental in its most literal form means of or from the Orient, as opposed to Occidental meaning from the Occident. ... Orientation can refer to different things. ... This page is a candidate to be moved to Wiktionary. ... Orlistat (marketed as Xenical) is a drug designed to treat obesity. ... Ornithine is an amino acid, whose structure is: NH2-CH2-CH2-CH2-CHNH2-COOH Ornithine is one of the products of the action of the enzyme arginase on L-arginine, creating urea. ... The enzyme ornithine decarboxylase (PDB 7odc, EC 4. ... Ornithine transcarbamylase deficiency (OTC), the most common of the Urea Cycle Disorders, is a rare metabolic disorder, occurring in one out of every 40000 births. ... The pharynx is the part of the digestive system of many animals immediately behind the mouth and in front of the esophagus. ... A rare disease has such a low prevalence in a population that a doctor in a busy general practice would not expect to see more than one case a year. ... An orphan drug is any drug developed under the 1983 U.S. Orphan Drug Act, which concerns drugs for orphan diseases, namely such affecting less than 200,000 people in the US. This has been adopted as a subclause of the FDA. Developing a drug for groups that small would... This article needs to be wikified. ... Genera Influenzavirus A Influenzavirus B Influenzavirus C Isavirus Thogotovirus The Orthomyxoviridae are a family of RNA viruses which infect vertebrates. ... Orthopedic surgery or orthopedics (BE: orthopaedics) is the branch of surgery concerned with acute, chronic, traumatic and recurrent injuries and other disorders of the locomotor system, its musclular and bone parts. ... Families Order: Orthoptera Suborder: Caelifera Acrididae Charilaidae Dericorythidae Eumastacidae Euschmidtiidae Lathiceridae Lentulidae Lithidiidae Ommexechidae Pamphagidae Pneumoridae Pyrgacrididae Pyrgomorphidae Romaleidae Tanaoceridae Tetrigidae Thericleidae Tridactylidae Tristiridae Suborder: Ensifera Cooloolidae Anostostomatidae Gryllacrididae Gryllidae Gryllotalpidae Haglidae Mogoplistidae Myrmecophilidae Rhaphidophoridae Stenopelmatidae Tettigoniidae Ref. ... Exoskeleton, in contrast of endoskeleton, is a general term to describe various external anatomical features that support and protect animals bodies. ... Orthostatic hypotension (also known as postural hypotension) is a sudden fall in blood pressure that occurs when a person assumes a standing position. ... Species Oryza barthii Oryza glaberrima Oryza latifolia Oryza longistaminata Oryza punctata Oryza rufipogon Oryza sativa References ITIS 41975 2002-09-22 This article is about the food grain, not the university or Condoleezza Rice; see also rice (disambiguation). ... Osgood Schlatter disease is an inflammation of the front of the tibia (shinbone). ... General Name, Symbol, Number Osmium, Os, 76 Chemical series transition metals Group, Period, Block 8 (VIIIB), 6, d Density, Hardness 22610 kg/m3, 7 Appearance Silvery, Blue Cast Atomic properties Atomic weight 190. ... Osmolality, in biology and chemistry, is a measure of moles of solute per kilogram of solvent. ... Osmolality, in biology and chemistry, is a measure of moles of solute per kg of water. ... An osmoreceptor is a sensory receptor primarily found in the hypothalamus of most homeothermic organisms that detects changes in osmotic pressure. ... Osmosis is the diffusion of a solvent through a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. ... Turgor (also called turgor pressure or osmotic pressure) is the pressure that can build in a space that is enclosed by a membrane that is permeable to a solvent such as water but not to solutes. ... Subclasses Actinopterygii Sarcopterygii Osteichthyes are the bony fish, a group paraphyletic to the land vertebrates, which are sometimes included. ... Osteoarthritis (OA), also known as arthrosis or degenerative joint disease, is a disease featuring pain and impaired function of the joints. ... An osteoblast (from the Greek words for bone and to build) is a cell which produces osteoid. ... An osteoclast is a multinucleated cell that degrades and reabsorbs bone. ... An osteocyte, a star-shaped cell, is the most abundant cell found in bone. ... Osteogenesis imperfecta (OI), commonly known as brittle bone disease, is a group of genetic bone disorders. ... Osteopetrosis is an extremely rare inherited disorder whereby the bones harden, becoming denser. ... Osteoporosis is a disease of bone in which the amount of bone is decreased and the strength of trabecular bone is reduced, cortical bone becomes thin and bones are susceptible to fracture. ... Osteosarcoma is the most common primary malignant bone tumour, excluding myeloma and lymphoma. ... Orders Archaeocopida (extinct) Leperditicopida (extinct) Palaeocopida (extinct) Podocopida Platycopida Myodocopida Introduction Ostracoda is a class of the Crustacea, sometimes known as the seed shrimp because of their appearance. ... Otitis media (also known as glue ear) is an inflammation of the middle ear, usually associated with a buildup of fluid and frequently causes an earache. ... An otoacoustic emission is a sound produced by the movement of the outer cochlear hairs in the mammalian cochlea. ... For other meanings of the term space, see space. ... The egg white is a clear liquid (also called albumen or ovalbumin) contained within a birds egg. ... Ovarian cancer is a malignant ovarian neoplasm (an abnormal growth located on the ovaries). ... Ovarian follicles or Graafian follicles (after Regnier de Graaf) are the roughly spherical cell aggregations in the ovary containing an ovum and from which the egg is released during ovulation. ... Human female internal reproductive anatomy Ovaries are a part of a female organism that produces eggs. ... A drug overdose occurs when a chemical substance (i. ... Binge eating disorder is a medical syndrome in which, according to currently accepted definitions, people: feel their eating is out of control; eat what most people would think is an unusually large amount of food; eat much more quickly than usual during binge episodes; eat until so full they are... World population increase. ... Obesity is an excess storage of fat and can affect any mammal, such as the mouse on the left. ... Engraved frontispiece of George Sandyss 1632 London edition of Publius Ovidius Naso, (March 20, 43 BC – AD 17) Roman poet known to the English-speaking world as Ovid, wrote on topics of love, abandoned women, and mythological transformations. ... In oviparous animals (those that lay eggs), the passage from the ovaries to the outside of the body is known as the oviduct. ... Ovulation is the process of discharging a mature ovum (egg) from an ovary after a Graafian follicle - representing the final stage of follicular development before ovulation - has been formed. ... A human ovum An ovum (also oocyte, ovocyte, or loosely, egg or egg cell) is a female sex cell or gamete. ... Families Strigidae Tytonidae An owl is any of some 200+ species of solitary nocturnal birds of prey in the order Strigiformes. ... Oxalic acid ( IUPAC name: ethanedioic acid) is a bi- carboxylic acid with structure ( HOOC)-(COOH). ... Oxazepam is a benzodiazepine hypnotic sold under the name Serax. ... Oxazole is a heterocyclic aromatic organic compound. ... The most fundamental reactions in chemistry are the redox processes. ... The most fundamental reactions in chemistry are the redox processes. ... Oxidative phosphorylation is a biochemical process in cells. ... An oxide is a chemical compound of oxygen with other chemical elements, e. ... An oxidizing agent is a substance used in electrochemistry that oxidizes another substance. ... An oxime is one in a class of chemical compounds with the general formula R1R2 C N O H, where R1 is an organic side chain and R2 is either hydrogen, forming an aldoxime, or another organic group, forming a ketoxime. ... Oxoglutarate dehydrogenase (aka α-ketoglutarate dehydrogenase) is an enzyme most commonly known for its role in the citric acid cycle. ... General Name, Symbol, Number Oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16 (VIA), 2, p Density, Hardness 1. ... Oxytocin is a nine amino acid peptide hormone synthesized in magnocellular neurosecretory cells in the hypothalamus and released by the posterior lobe of the pituitary gland. ... The name oyster is used for a number of different groups of mollusks which grow for the most part in marine or brackish water. ... Ozone (O3) is an allotrope of oxygen, the molecule consisting of three oxygen atoms instead of the more stable diatomic O2. ...