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zoogony
SYN: viviparity.
zoograft
A graft of tissue from an animal to a human. SYN: animal graft, zooplastic graft.
zoografting
SYN: zooplasty.
zooid
1. Resembling an animal; an organism or object with an animal-like appearance. 2. An animal cell capable of independent existence or movement, as the ovum or a spermatozoon, or ...
zoolagnia
An older term for sexual attraction toward animals. [zoo- + G. lagneia, lust]
zoolite, zoolith
A petrified animal. [zoo- + G. lithos, stone]
zoologist
One who specializes in zoology.
zoology
The branch of biology that deals with animals. [zoo- + G. logos, study]
zoom
The action of a varifocal lens system in a camera or microscope that maintains an object in focus while approaching it or receding from it; this effect may be obtained by moving ...
zoomania
An excessive, abnormal love of animals. [zoo- + G. mania, frenzy]
zoomaric acid
SYN: palmitoleic acid.
Zoomastigina
SYN: Zoomastigophorea. [zoo- + G. mastix, whip]
Zoomastigophorasida
SYN: Zoomastigophorea.
Zoomastigophorea
A class of flagellates (superclass Mastigophora) within the phylum Sarcomastigophora ( flagellate and ameboid protozoans), of animal-like as opposed to plantlike ...
Zoonosis
An infectious disease in animals that can be transmitted to people. The natural reservoir for the infectious agent is a animal. Examples of zoonoses include rabies (a viral ...
zoonotic
Relating to a zoonosis.
Zoonotic disease
Diseases spread from animals to people. Examples of zoonotic diseases include rabies (a viral disease that can be transmitted to humans through an infected animal's bite) and ...
Zooparasite
A living parasite, such as a worm or protozoa. * * * An animal parasite; an animal existing as a parasite.
zoopathology
The study or science of diseases of the lower animals.
zoophagous
SYN: carnivorous. [G. zoophagos, fr. zoon, animal, + phagein, to eat]
zoophile
1. A lover of animals; especially one more fond of animals than of humans. 2. One opposed to any animal experimentation; an antivivisectionist. [zoo- + G. philos, fond]
Zoophilia
A sexual disorder involving an erotic attraction to animals or an abnormal desire to have sexual contact with animals. Zoophilia is one form of paraphilia (deviant sexual ...
zoophilic
1. Relating to or displaying zoophilism. 2. Animal-seeking or animal-preferring; denoting preference of a parasite for an animal host over a human. [zoo- + G. philos, fond, ...
zoophilism
Fondness for animals, especially an extravagant fondness for them. - erotic z. the deriving of sexual pleasure by patting or stroking animals. SEE ALSO: zoophilia, bestiality. ...
Zoophobia
An abnormal and persistent fear of animals. A phobia is an unreasonable fear that can cause avoidance and panic. Phobias are a relatively common type of anxiety disorder. Phobias ...
zoophyte
An animal that resembles a plant, such as the sponges or sea anenomes. [zoo- + G. phyton, plant]
zooplasty
Grafting of tissue from an animal to a human. SYN: zoografting.
zoosadism
Sexual pleasure from cruelty to animals.
zoosmosis
The process of osmosis in living tissues. [G. zoos, living, + osmosis]
zoospermia
The presence of live spermatozoa in the ejaculated semen. [G. zoon, living, + sperma, seed, + -ia]
zoosterol
An animal sterol.
zootechnics
The art of managing domestic or captive animals, including handling, breeding, and keeping. [zoo- + G. techne, art]
zootic
Pertaining to animals other than humans.
zootoxin
A substance, resembling the bacterial toxins in its antigenic properties, found in the fluids of certain animals; e.g., in snake venom, the secretions of poisonous insects, eel ...
zootrophic
Relating to or serving for the nutrition of the lower animals. [zoo- + Gr. trophe, nourishment]
zorubicin
Semisynthetic derivative of daunorubicin; also similar to doxorubicin. Like those agents, z. exerts significant myocardial toxicity. Used as an antineoplastic in breast ...
zoster
SYN: herpes z.. [G. z., a girdle] - geniculate z. (jen-i′kyu-lat zos′ter) SYN: herpes z. oticus.
zosteriform
SYN: zosteroid.
zosteroid
Resembling herpes zoster. SYN: zosteriform. [ zoster + G. eidos, resemblance]
zoxazolamine
A centrally acting skeletal muscle relaxant that is no longer used because of its hepatic toxicity.
Zr
Symbol for zirconium.
Zsigmondy
Richard A., Austro-German chemist and Nobel laureate, 1865–1929. See Z. test, brownian-Z. movement.
ZSR
Abbreviation for zeta sedimentation ratio.
Zuckerkandl
Emil, Austrian anatomist, 1849–1910. See Z. bodies, under body, Z. convolution, Z. fascia, organs of Z., under organ.
zusammen
1. SYN: cis- (4). 2. A form of geometric isomerism with regard to carbon-carbon double bonds in which all four moieties attached to the carbons are different. If the ...
zwieback
Sweetened bread that has been baked twice, preferred for infant feeding during teething. [Ger. twice-baked]
Zwischenferment
SYN: glucose-6-phosphate dehydrogenase. [Ger. zwischen, between, + Ferment, fermentation]
zwittergents
Detergents that are zwitterionic; often used as surfactants and in the release of proteins from biomembranes. SYN: zwitterionic detergent. [zwitterion + detergent]
zwitterionic
Denoting a substance with the properties of a zwitterion; e.g., at pH value of 6.11, alanine is z..
zwitterions
SYN: dipolar ions, under ion. SEE ALSO: zwitter hypothesis. [Ger. Zwitter, hermaphrodite, mongrel + ion]
zyg-
See zygo-.
zygal
Relating to or shaped like a zygon or yoke; H-shaped.
zygapophysial, zygapophyseal
Relating to a zygapophysis or articular process of a vertebra.
zygapophysis
SYN: articular process, articular process. [G. zygon, yoke, + apophysis, offshoot] - z. inferior [TA] SYN: inferior articular process. - z. superior [TA] SYN: superior ...
zygion
In cephalometrics and craniometrics, the most lateral point of the zygomatic arch. [G. a later form of zygon, yoke]
zygo-, zyg-
A yoke, a joining. [G. zygon, yoke, zygosis, a joining]
Zygoma
The part of the temporal bone of the skull that forms the prominence of the cheek. The zygoma is also known as the zygomatic bone or arch, the malar bone, the cheek bone and the ...
zygomatic
Relating to the z. bone.
Zygomatic arch
The part of the temporal bone of the skull that forms the prominence of the cheek. The zygomatic arch is also known as the zygomatic bone, the zygoma, the malar bone, the cheek ...
Zygomatic bone
The part of the temporal bone of the skull that forms the prominence of the cheek. The zygomatic bone is also known as the zygomatic arch, the zygoma, the malar bone, the cheek ...
zygomatico-
Zygomatic; relating usually to the zygomatic bone. See zygo-. [G. zygoma]
zygomatico-orbital
Relating to the zygomatic bone and the orbit.
zygomaticoauricular
Relating to the zygomatic bone and the auricle.
zygomaticoauricularis
SYN: auricularis anterior (muscle).
zygomaticofacial
Relating to the zygomatic bone and the face.
zygomaticofrontal
Relating to the zygomatic and frontal bones.
zygomaticomaxillary
Relating to the zygomatic bone and the maxilla.
zygomaticosphenoid
Relating to the zygomatic and sphenoid bones.
zygomaticotemporal
Relating to the zygomatic and temporal bones.
zygomaxillare
A craniometric point located externally at the lowest extent of the zygomaticomaxillary suture. SYN: key ridge, zygomaxillary point.
zygomaxillary
Relating to the zygomatic bone and the maxilla.
Zygomycetes
A class of fungi characterized by sexual reproduction resulting in the formation of a zygospore, and asexual reproduction by means of nonmotile spores called sporangiospores or ...
Zygomycosis
A dangerous infection caused by a water-borne fungus. Zygomycosis is seen most often in patients who are already ill with diseases that cause wasting, such as AIDS or poorly ...
zygon
The short crossbar connecting the branches of a zygal fissure. [G. crossbar, yoke]
zygonema
SYN: zygotene. [zygo- + G. nema, thread]
zygopodium
The distal intermediate segment of the limb skeleton, i.e., radius and ulna, tibia and fibula. [zygo- + G. podion, small foot]
zygosis
True conjugation or sexual union of two unicellular organisms, consisting essentially in the fusion of the nuclei of the two cells. [G. a joining]
zygosity
The nature of the zygotes from which individuals are derived; e.g., whether by separation of the division of one zygote (monozygotic), in which case they will be genetically ...
zygosperm
SYN: zygospore. [zygo- + G. sperma, seed]
zygospore
Among the Phycomycetes, a thick-walled sexual spore arising from fusion of two morphologically identical structures, generally hyphal tips, bearing nuclei of opposite mating ...
zygosyndactyly
Complete or incomplete webbing of the fingers or toes. [zygo- + syndactyly]
Zygote
The cell formed by the union of a male sex cell (a sperm) and a female sex cell (an ovum). The zygote develops into the embryo following the instruction encoded in its genetic ...
Zygote intrafallopian transfer (ZIFT)
: A technique in which a woman's egg is fertilized outside the body, then implanted in one of her fallopian tubes. This technique is one of the methods used to overcome ...
zygotene
The stage of prophase in meiosis in which precise point for point pairing of homologous chromosomes begins. SYN: zygonema. [zygo- + G. tainia (L. taenia), band]
zygotic
Pertaining to a zygote, or to zygosis.
Zygotic lethal gene
A gene that is lethal (fatal) for the zygote, the cell formed by the union of a sperm (male sex cell) and an ovum (female sex cell). The zygote would normally develop into an ...
zygotoblast
SYN: sporozoite. [G. zygotos, yoked, + blastos, germ]
zygotomere
SYN: sporoblast. [G. zygotos, yoked, + meros, part]
zym-
See zymo-.
zymase
1. Obsolete term for a mixture of enzymes. 2. Specifically, the intracellular enzymes of yeast that promotes alcoholic fermentation.
zymo-, zym-
Fermentation, enzymes. [G. zyme, leaven]
zymodeme
An isoenzyme pattern, as identified by isoenzyme electrophoresis. [zymo- + G. demos, populace]
zymogen
SYN: proenzyme.
zymogenesis
Transformation of a proenzyme ( zymogen) into an active enzyme. [zymo- + G. genesis, production]
zymogenic
1. Relating to a zymogen or to zymogenesis. SYN: zymogenous. 2. Causing fermentation.
zymogenous
SYN: zymogenic (1).
zymogram
Strips of paper, gels, etc., in which the locations of enzymes, separated electrophoretically or by other means, are demonstrated by histochemical methods. [zymo- + G. gramma, ...
zymosan
A carbohydrate (glucose polymer) obtained from the walls of yeast cells that interferes with complement.
zymoscope
An instrument measuring CO2 evolved and, therefore, the fermenting power of yeast. [zymo- + G. skopeo, to view]
zymosterol
An intermediate in the biosynthesis of cholesterol from lanosterol.
zyxin
A cytoplasmic protein found in a number of distinct types of adherens junctions; it may play a role in the organization of membrane-cytoskeletal attachments.
ZZ
See ZZ genotype.
[α]
Symbol for specific optic rotation.
°A
Symbol for degree absolute; replaced by K (kelvin).
α
1. First letter of the Greek alphabet, alpha; used as a classifier in the nomenclature of many sciences. 2. Symbol for Bunsen solubility coefficient. 3. In chemistry, denotes ...
α-acetolactic acid
An intermediate in pyruvic acid catabolism and valine biosynthesis.
α-actinin
An F-actin binding protein in vertebrate cells that cross-links actin filaments into regular parallel arrays. It is found in both the Z line and the I band.
α-allocortol
The 5α enantiomer of α-cortol; a metabolite of hydroxycortisone found in the urine.
α-allocortolone
The 5α enantiomer of α-cortolone; a metabolite of hydrocortisone found in urine.
α-allopregnanediol
5α-Pregnane-3α,20α-diol; a metabolite of progesterone and adrenocortical hormones, found in urine.
α-amanitin
A highly toxic, heat-stable bicyclic oligopeptide in Amanita phalloides. It inhibits transcription by certain RNA polymerases.
α-amino acid
Typically, an amino acid of the general formula R—CHNH2—COOH ( i.e., the NH2 in the α position); the l forms of these are the hydrolysis products of proteins. In rarer ...
α-amino-β-ketoadipic acid
An intermediate of porphobilinogen synthesis formed by δ-aminolevulinic acid synthase from succinyl-CoA and glycine; it rapidly decarboxylates to δ-aminolevulinic acid.
α-aminoadipic acid
2-amino-1,6-hexanedioic acid; an intermediate of lysine biosynthesis in higher fungi and bacteria, but not in algae and higher plants. Also found in the degradation of lysine ...
α-aminoisobutyric acid
2-amino-2-methylpropionic acid; a synthetic amino acid useful in the study of amino acid transport across cell membranes and in the study of cytokine effects; it is not ...
α-amylase
A glucanohydrolase yielding α-glucose and maltose in a random manner from 1,4-α-glucans. An amylase that has been used clinically as a digestive aid. SYN: glycogenase, ...
α-chloralose
A conjugate of chloral and glucose used as an anesthetic in laboratory animals; it does not depress cardiovascular reflexes as much as most other anesthetic agents.
α-cortol
The 5β enantiomer of α-allocortol; a reduction product of cortisone, present in the urine, differing from cortisone in that the three keto groups are reduced to hydroxyls.
α-cortolone
The 5β enantiomer of α-allocortolone; a reduction product of cortisone, present in the urine, differing from cortisone in that two of the keto groups (at positions 3 and 20) ...
α-d-galactosidase
An enzyme catalyzing the hydrolysis of α-d-galactosides to release free d-galactose. A deficiency of type A α-d-galactosidase is associated with Fabry disease. SYN: melibiase. ...
α-d-glucosidase
Maltase; a glucohydrolase removing terminal nonreducing 1,4-linked α-glucose residues by hydrolysis, yielding α-glucose; a deficiency of the lysosomal enzyme is associated with ...
α-dextrin endo-1,6-α-glucosidase
An enzyme with action similar to that of isoamylase; it cleaves 1,6-α-glucosidic linkages in pullalan, amylopectin, and glycogen, and in α- and β-amylase limit-dextrins of ...
α-farnesene
A straight open-chain hydrocarbon built up of three isoprene units; one of the four isomeric forms occurs in the natural coating of apples.
α-fucosidase
An enzyme that catalyzes the hydrolysis of an an α-l-fucoside, producing an alcohol and l-fucose; a deficiency of the lysosomal enzyme will result in fucosidosis.
α-glucan phosphorylase
SYN: phosphorylase.
α-glucan-branching glycosyltransferase
SYN: 1,4-α-d-glucan-branching enzyme.
α-hydroxyethylthiamin pyrophosphate
SYN: activated acetaldehyde.
α-ketodecarboxylase
Formerly, the enzyme system converting pyruvate (a 2-oxoacid) to acetyl-CoA and CO2, with reduction of NAD+ to NADH and the participation of lipoamide and thiamin ...
α-ketoglutaramic acid
A metabolite of glutamine formed by the action of glutamine aminotransferase; elevated in certain cases of hepatocoma. SYN: 2-oxoglutaric acid.
α-ketoglutarate
A salt or ester of α-ketoglutaric acid. - α-ketoglutarate dehydrogenase an enzyme that catalyzes the oxidative decarboxylation of 2-ketoglutaric acid to ...
α-ketosuccinamic acid
The transamination product of asparagine; acted upon by ω-amidase.
α-l-iduronidase
An enzyme that hydrolyzes terminal desulfated α-l-iduronic acid residues of dermatan sulfate and of heparan sulfate; a deficiency of this enzyme is associated with Hurler ...
α-lactyl-thiamin pyrophosphate
SYN: active pyruvate.
α-N-acetylgalactosaminidase
An enzyme that hydrolyzes 2-acetamido-2-deoxy-α-d-galactosides to the alcohol and free 2-acetamido-2-deoxy-d-galactose. A deficiency of this enzyme will result in Schindler ...
α-N-acetylglucosaminidase
An enzyme that hydrolyzes glycosides of N-acetylglucosamine producing the alcohol and N-acetylglucosamine. A deficiency of this enzyme results in mucopolysaccharidosis III B.
α-naphthylthiourea
A derivative of thiourea; a highly toxic antithyroid agent, especially to small mammals, causing pulmonary edema, fatty degeneration of the liver, and low body temperature; used ...
α-phenoxyethylpenicillin potassium
SYN: phenethicillin potassium.
α-prodine hydrochloride
See alphaprodine.
α-ribazole
The benzimidazole nucleoside in vitamin B12.
α-sarcin
A fungal toxin that acts on the large subunit of rRNA and inactivates the ribosome.
α-T
Symbol for α-tocopherol.
α-tocopherol
5,7,8-Trimethyltocol; a light yellow, viscous, odorless, oily liquid that deteriorates on exposure to light, is obtained from wheat germ oil or by synthesis, biologically ...
α1-antichymotrypsin
An inhibitor protein of the digestive protease, chymotrypsin.
α1PI
Abbreviation for human α1-protease inhibitor.
α2-neuraminoglycoprotein
A glycoprotein that contains neuraminic acid and that during electrophoresis migrates with the α2 portion of serum proteins. SEE ALSO: C1 esterase inhibitor.
β
1. Second letter of the Greek alphabet, beta. 2. In chemistry, denotes the second in a series, the second carbon from a functional ( e.g., carboxylic) group, or the direction of ...
β+
Symbol for positron.
β,β-dimethylcysteine
SYN: penicillamine.
β-alanine
3-Aminopropionic acid or β-aminopropionic acid; a decarboxylation production of aspartic acid. Found in brain, in carnosine, and in coenzyme A.
β-alanine-pyruvate aminotransferase
An enzyme that reversibly transfers the amino group of β-alanine to pyruvate, thus producing l-alanine and malonate semialdehyde. A deficiency of this enzyme is believed to ...
β-allocortol
The 20β isomer of α-allocortol and 5α enantiomer of β-cortol; a metabolite of hydrocortisone found in urine.
β-allocortolone
The 20β isomer of α-allocortolone and 5α enantiomer of β-cortolone; a metabolite of hydrocortisone found in urine.
β-allopregnanediol
The 5α-pregnane-3β,20α(and β)-diols; both are metabolites of progesterone and adrenocortical hormones; found in urine.
β-aminoisobutyrate:pyruvate aminotransferase
β-Aminosiobutyrate:pyruvate transaminase; an enzyme that catalyzes the reversible transfer of an amino group from β-aminoisobutyrate to pyruvate, producing l-alanine and ...
β-aminoisobutyric acid
3-Amino-2-methylpropionic acid; an end product of thymine catabolism; high urinary levels (200–300 mg/day) have been noted in some individuals, either from some disease ...
β-amylase
A glucanohydrolase yielding β-maltose units from the nonreducing ends of 1,4-α-glucans. An exoamylase. SYN: glycogenase, saccharogen amylase.
β-aspartyl
Misnomer for 1-(β-asparagino)-N-acetylglucosamine or 1-(β-aspartamido)-N-acetylglucosamine, or, formally, 1-(β-l-aspartamido)-N-2-acetamido-1,2-dideoxy-β-d-glucose; a compound ...
β-carotene 15,15′-dioxygenase
An enzyme catalyzing the reaction of β-carotene plus O2, producing two retinals. SYN: β-carotene-cleavage enzyme, carotenase.
β-corticotropin
Acid- or pepsin-degraded β-corticotropin. SYN: corticotropin (2).
β-cortol
α-Cortol with a 20β-OH group; the 5β enantiomer of β-allocortol, found in urine.
β-cortolone
α-Cortolone with a 20β-OH group; the 5β enantiomer of β-allocortolone, found in urine.
β-cystathionase
SYN: cystathionine β-lyase.
β-d-galactosidase
A sugar-splitting enzyme that catalyzes the hydrolysis of lactose into d-glucose and d-galactose, and that of other β-d-galactosides; it also catalyzes galactotransferase ...
β-d-glucosidase
A glucohydrolase similar to α-d-glucosidase, but attacking β-glucosides and releasing β-d-glucose. SYN: amygdalase, cellobiase, gentiobiase.
β-d-glucuronidase
An enzyme catalyzing the hydrolysis of various β-d-glucuronides, liberating free d-glucuronic acid and an alcohol; a deficiency of this enzyme is associated with Sly syndrome. ...
β-farnesene
One of the two isomers (trans) that occurs in the alarm pheromone of some aphids and also in various essential oils.
β-fructofuranosidase
β-h-Fructosidase; an enzyme hydrolyzing β-d-fructofuranosides and releasing free d-fructose; if the substrate is sucrose, the product is d-glucose plus d-fructose (invert ...
β-galactosidase
An enzyme that hydrolyzes the beta galactoside linkage in lactose-producing glucose and galactose; also hydrolyzes the chromogenic substrate IPTG ( isopropylthiogalactoside) ...
β-galactosylceramidase
An enzyme that participates in the catabolism of certain ceramides; a deficiency of β-galactosylceramidase is associated with Krabbe disease.
β-glucocerebrosidase
An enzyme that hydrolyzes β-glucosides in cerebrosides; a deficiency of this enzyme results in Gaucher disease.
β-HCG
SYN: chorionic gonadotropin.
β-hydroxy-β-methylglutaryl-CoA
A key intermediate in the synthesis of ketone bodies, of steroids, and of farnesyl and geranyl derivatives. SYN: 3- hydroxy- 3-methylglutaryl-CoA. - β- hydroxy- ...
β-hydroxybutyric acid
SYN: 3-hydroxybutyric acid.
β-hydroxyisobutyric acid
An intermediate in the degradation of l-valine.
β-hydroxypropionic acid
A minor intermediate in propionate and methylmalonate metabolism. See β-hydroxypropionic aciduria.
β-hydroxypropionic aciduria
Elevated levels of β-hydroxypropionic acid in the urine; seen in defects in methylmalonic acid and propionate metabolism, as well as in ketotic hyperglycinemia syndrome.
β-ketoacyl-ACP reductase
SYN: 3-oxoacyl-ACP reductase.
β-ketoacyl-ACP synthase
SYN: 3-oxoacyl-ACP synthase.
β-ketohydrogenase
SYN: 3-hydroxyacyl-CoA dehydrogenase.
β-ketoreductase
SYN: 3-hydroxyacyl-CoA dehydrogenase.
β-ketothiolase
SYN: acetyl-CoA acyltransferase.
β-lactam
A class of broad-spectrum antibiotics that are structurally and pharmacologically related to the penicillins and cephalosporins.
β-lactamase
An enzyme produced by many species of bacteria that disrupts the four-membered β-lactam ring of penicillin and cephalosporin groups of antibiotics, destroying their ...
β-mercaptoethanol
SYN: 2- mercaptoethanol.
β-sitosterol
A phytosterol and anticholesteremic. SYN: cinchol.
β-sulfinylpyruvic acid
An intermediate product of l-cysteine catabolism in mammalian tissue.
β-T
Symbol for β-tocopherol.
β-thionase
SYN: cystathionine β-synthase.
β-tocopherol
A lower homolog of α-tocopherol that contains one less methyl group in the aromatic nucleus and is less active biologically; accompanies α-tocopherol and γ-β-tocopherol.
β-tyrosinase
SYN: tyrosine phenol- lyase.
β−
Symbol for electron.
γ
1. Third letter in the Greek alphabet, gamma. 2. In chemistry, denotes the third in a series, the fourth carbon in an aliphatic acid, or position 2 removed from the α position ...
γ-Abu
Abbreviation for γ-aminobutyric acid.
γ-aminobutyric acid
4-Aminobutyric acid; a constituent of the central nervous system; quantitatively the principal inhibitory neurotransmitter. Used in the treatment of a number of disorders ( ...
γ-amylase
SYN: exo-1,4-α-d-glucosidase.
γ-butyrobetaine
A betaine of γ-aminobutyric acid; a precursor of carnitine by hydroxylation of the β-carbon.
γ-cystathionase
SYN: cystathionine γ-lyase.
γ-glutamyl carboxylase
An enzyme that catalyzes the formation of γ-carboxyglutamyl residues in many proteins, several appearing in the blood clotting cascade.
γ-glutamyl hydrolase
An enzyme cleaving l-glutamyl residues from pteridine oligoglutamates; used in certain antitumor treatments. SYN: carboxypeptidase G, γ-glutamate (glutamate γ-) ...
γ-glutamyl transpeptidase
SYN: γ-glutamyltransferase.
γ-glutamylcysteine
A necessary precursor in the biosynthesis of glutathione; contains an isopeptide rather than a eupeptide bond. - γ-glutamylcysteine synthetase an enzyme that catalyzes the ...
γ-glutamyltransferase
An enzyme that catalyzes the transfer of a γ-glutamyl group from a γ-glutamyl peptide (usually glutathione) to another peptide, certain amino acid s, or water; a deficiency of ...
γ-hydroxybutyrate
a naturally occurring short-chain fatty acid, a metabolite of γ- aminobutyric acid ( GABA) found in all body tissues, with the highest concentration in the brain; it affects ...
γ-iodopropyleneglycol
SYN: glyceryl iodide.
γ-T
Symbol for γ-tocopherol.
γ-tocopherol
A form biologically less active than α-γ-tocopherol.
Δ check
SYN: delta check.
Δ, δ
1. Fourth letter of the Greek alphabet, delta. 2. In chemistry, denotes a double bond, usually with a superscript to indicate position in a chain (Δ5); application of heat in a ...
δ-aminobutyric acid amino transferase
An enzyme catalyzing the reversible transfer of an amino group from δ-aminobutyric acid to 2-oxoglutarate, thus forming a l-glutamic acid and succinate semialdehyde. An ...
δ-aminolevulinate dehydratase
SYN: porphobilinogen synthase.
δ-aminolevulinic acid
An acid formed by δ-aminolevulinate synthase from glycine and succinyl-coenzyme A; a precursor of porphobilinogen, hence an important intermediate in the biosynthesis of heme. ...
δ-hydroxylysine
SYN: 5-hydroxylysine.
ε
1. Fifth letter of the Greek alphabet, epsilon. 2. Symbol for molar absorption coefficient or extinction coefficient. For terms beginning with this prefix, see the specific ...
θ, Θ
The eighth letter in the Greek alphabet, theta; symbol for angle.
ι
The ninth letter in the Greek alphabet, iota.
κ
Symbol for kappa, the tenth letter in the Greek alphabet.
Λ
1. The 11th letter of the Greek alphabet, lambda. 2. Symbol (λ) for Avogadro number; wavelength; radioactive constant; Ostwald solubility coefficient; molar conductivity ...
μ
1. The 12th letter of the Greek alphabet, mu. 2. Symbol for micro- (2); micron; dynamic viscosity; magnetic or electric dipole moment of a molecule; chemical potential; ...
μB
1. Symbol for Bohr magneton.
μC
Symbol for microcoulomb.
μCi
Symbol for microcurie.
μg
Symbol for microgram.
μl, μL
Symbol for microliter.
μm
Symbol for micrometer.
μmol
Symbol for micromole.
μmol/L
Symbol for micromolar.
μN
Symbol for nuclear magneton.
μV
Symbol for microvolt.
μμ
micromicro-; micromicron.
μμg
Symbol for micromicrogram.
μΩ
Symbol for microhm.
ν
1. The 13th letter of the Greek alphabet, nu. 2. Symbol for kinematic viscosity; frequency; stoichiometric number. 3. In chemistry, denotes the position of a substituent ...
π
1. The 16th letter of the Greek alphabet, pi. 2. Symbol for the ratio of the circumference of a circle to its diameter, approximately 3.14159; symbol for osmotic pressure (Π). ...
Π
See π.
ρ
1. The 17th letter of the Greek alphabet, rho. 2. Symbol for population correlation coefficient; density.
σ, Σ
1. The 18th letter of the Greek alphabet, sigma. 2. (σ) Symbol for reflection coefficient; standard deviation; a factor in prokaryotic RNA initiation; wavenumber; surface ...
τ
The 19th letter of the Greek alphabet, tau; symbol for relaxation time.
Υ
1. Upsilon, 20th letter of the Greek alphabet. 2. Symbol for kinematic viscosity.
Φ
The 21st letter of the Greek alphabet, phi. Symbol for phenyl; symbol for quantum yield (π).
φ
See Φ.
Ψ, Ψrd
1. Capital psi, the 23rd letter of the Greek alphabet. 2. Symbol for pseudouridine; psychology.
Ω
1. The 24th and last letter of the Greek alphabet, omega. 2. Symbol for ohm.
—His
Symbol for histidino.

Symbol for recipe in a prescription. See prescription (2).

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