Từ điển y khoa
Thuật ngữ y khoa chuẩn hóa theo MeSH, ICD-11, SNOMED CT.
62,341 terms indexed
A plant genus of the family MELIACEAE. Members contain azadirachtin A (a limonoid commonly referred to as azadirachtin) and other TRITERPENES. They have been used in PESTICIDES. The old name of Melia azadirachta is very similar to a related plant, MELIA AZEDARACH.
One of the early purine analogs showing antineoplastic activity. It functions as an antimetabolite and is easily incorporated into ribonucleic acids.
A butyrophenone used in the treatment of PSYCHOSES.
brinzolamide and timolol combination
Antibiotic substance produced by various Streptomyces species. It is an inhibitor of enzymatic activities that involve glutamine and is used as an antineoplastic and immunosuppressive agent.
Steroidal compounds in which one or more carbon atoms in the steroid ring system have been substituted with nitrogen atoms.
An immunosuppressive agent used in combination with cyclophosphamide and hydroxychloroquine in the treatment of rheumatoid arthritis. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), this substance has been listed as a known carcinogen. (Merck Index, 11th ed)
A triazine nucleoside used as an antineoplastic antimetabolite. It interferes with pyrimidine biosynthesis thereby preventing formation of cellular nucleic acids. As the triacetate, it is also effective as an antipsoriatic.
Seven membered heterocyclic rings containing a NITROGEN atom.
A country located in Southwestern Asia, bordering the Caspian Sea, between Iran and Russia, with a small European portion north of the Caucasus range. The capital is Baku.
A proline analog that acts as a stoichiometric replacement of proline. It causes the production of abnormal proteins with impaired biological activity.
Organic or inorganic compounds that contain the -N3 group.
An organothiophosphorus cholinesterase inhibitor. It has been used as an acaricide and as an insecticide.
Saturated azacyclopropane compounds. They include compounds with substitutions on CARBON or NITROGEN atoms.
Unsaturated azacyclopropane compounds that are three-membered heterocycles of a nitrogen and two carbon atoms.
A semi-synthetic macrolide antibiotic structurally related to ERYTHROMYCIN. It has been used in the treatment of Mycobacterium avium intracellulare infections, toxoplasmosis, and cryptosporidiosis.
A semisynthetic ampicillin-derived acylureido penicillin.
Organic chemicals where aryl or alkyl groups are joined by two nitrogen atoms through a double bond (R-N=N-R'; R and R' may be either aryl or alkyl). They may be used as DYES.
A genus of gram-negative, facultatively anaerobic bacteria including species which are often associated with grasses (POACEAE) and which fix nitrogen as well as species which anaerobically degrade toluene and other mono-aromatic hydrocarbons.
Five membered rings containing a NITROGEN atom.
A condition of having no sperm present in the ejaculate (SEMEN).
Azoospermia that is caused by hereditary defects which disrupt sperm development before or during meiosis. Mutations and polymorphisms in the USP9Y (OMIM: 415000), SLC26A8 (OMIM: 606766), DAZL (OMIM: 601486), and SYCP3 (OMIM: 270960) have been identified.
A group of nine islands and several islets belonging to Portugal in the north Atlantic Ocean off the coast of Portugal. The islands are named after the acores, the Portuguese for goshawks, living there in abundance. (Webster's New Geographical Dictionary, 1988, p102 and Room, Brewer's Dictionary of Names, 1992, p42)
A genus of gram-negative, rod-shaped, obligate aerobes which are motile by peritrichous flagella on solid medium and one lateral flagellum in liquid medium. Under microaerobic conditions Azorhizobium fixes nitrogen. (From Bergey's Manual of Determinative Bacteriology, 9th ed)
A species of AZORHIZOBIUM which forms nodules on the roots of the tropical legume Sesbania rostrata. (From Bergey's Manual of Determinative Bacteriology, 9th ed)
A genus of gram-negative aerobic bacteria that occurs free-living in the soil or associated with the roots of cereal crops or grasses (POACEAE).
A species of motile, free-living, gram-negative bacteria that occur in the soil. They are aerobic or microaerophilic and are sometimes capable of nitrogen fixation.
A species of gram-negative to gram-variable, nitrogen-fixing bacteria. They are free-living in SOIL or found in association with PLANT ROOTS. It is the type species of the genus AZOSPIRILLUM.
A biochemical abnormality referring to an elevation of BLOOD UREA NITROGEN and CREATININE. Azotemia can be produced by KIDNEY DISEASES or other extrarenal disorders. When azotemia becomes associated with a constellation of clinical signs, it is termed UREMIA.
A genus of gram-negative, aerobic bacteria found in soil and water. Its organisms occur singly, in pairs or irregular clumps, and sometimes in chains of varying lengths.
A species of gram-negative, aerobic bacteria first isolated from soil in Vineland, New Jersey. Ammonium and nitrate are used as nitrogen sources by this bacterium. It is distinguished from other members of its genus by the ability to use rhamnose as a carbon source. (From Bergey's Manual of Determinative Bacteriology, 9th ed)
A potent carcinogen and neurotoxic compound. It is particularly effective in inducing colon carcinomas.
A monocyclic beta-lactam antibiotic originally isolated from Chromobacterium violaceum. It is resistant to beta-lactamases and is used in gram-negative infections, especially of the meninges, bladder, and kidneys. It may cause a superinfection with gram-positive organisms.
Compounds based on a seven-membered ring fused to a five-membered ring. Heat can rearrange them to NAPHTHALENES which have two fused six-membered rings. They are similar to guaiazulenes which are SESQUITERPENES with a six-membered ring fused to a five-membered ring.
PHENOTHIAZINES with an amino group at the 3-position that are green crystals or powder. They are used as biological stains.
A bacterial protein from Pseudomonas, Bordetella, or Alcaligenes which operates as an electron transfer unit associated with the cytochrome chain. The protein has a molecular weight of approximately 16,000, contains a single copper atom, is intensively blue, and has a fluorescence emission band centered at 308nm.
A vein which arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava.
A tumor necrosis factor superfamily member that plays a role in the regulation of B-LYMPHOCYTE survival. It occurs as a membrane-bound protein that is cleaved to release an biologically active soluble form with specificity to TRANSMEMBRANE ACTIVATOR AND CAML INTERACTOR PROTEIN; B-CELL ACTIVATION FACTOR RECEPTOR; and B-CELL MATURATION ANTIGEN.
A member of the tumor necrosis factor receptor superfamily that specifically binds B-CELL ACTIVATING FACTOR. It is found on B-LYMPHOCYTES and plays a role in maturation and survival of B-cells. Signaling by the activated receptor occurs through its association with TNF RECEPTOR-ASSOCIATED FACTORS.