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mondofacto - Online Medical Dictionary Category: Health and Medicine > Medical Dictionary Date & country: 26/01/2008, UK Words: 116197

h strand
<molecular biology> The strand of a double-stranded DNA molecule that is more buoyant than the other and floats at the top of a column when the dsDNA is denatured and put in an equilibrium centrifuge. ... (09 Oct 1997) ...

h substance
<haematology> A polysaccharide precursor molecule which is used to make the antigens on the surface of human blood cells that are classified in the ABO blood group system. ... (09 Oct 1997) ...

H-2 antigen
<immunology> Antigen coded in the major group of transplantation antigens in the mouse. ... See: H-2 complex, histocompatability antigen. ... (20 Jun 2000) ...

H-2 complex
<immunology> A term that denotes the genes of the mouse equivalent of the human major histocompatibility complex system. ... It is a set of genetic loci coding for Class I and Class II major histocompatibility complex antigens and for complement components. ... See: histocompatability antigen. ... (20 Jun 2000) ...

H-protein lipoyltransferase
<enzyme> Requires lipoyl-AMP and apo-h-protein to generate the active h-protein of the glycine cleavage system ... Registry number: EC 2.3.1.- ... Synonym: lipoyl-AMP-n(epsilon)-lysine lipoyltransferase ... (26 Jun 1999) ...

H-R conduction time
Synonym for intraventricular conduction ... Conduction of the cardiac impulse through the ventricular myocardium, represented by the QRS complex in the electrocardiogram. H-R conduction time is from the onset of the first high frequency component of the His bundle electrogram to the onset of the QRS complex of the surface electrocardiogram (normally …

h-ras
<oncogene> A point-mutated proto-oncogene that is found in melanoma and in carcinoma of colon, lung and pancreatic tissue. ... (10 Oct 1997) ...

H-shape vertebrae
<radiology> Sharply delimited depression of the central portion of the endplates of the vertebrae, producing a stocky H shape on radiographs, as in sickle cell anaemia. ... (05 Mar 2000) ...

H-tetanase
<microbiology> Behring's term for the haemolytic constituent of tetanus toxin. ... (05 Mar 2000) ...

H-type fistula
<gastroenterology, surgery> A rare form of congenital tracheoesophageal fistula in which there is no oesophageal atresia, manifest as aspiration pneumonias. ... Synonym: H-type tracheoesophageal fistula. ... (05 Mar 2000) ...

H-type tracheoesophageal fistula
Synonym for H-type fistula ... <gastroenterology, surgery> A rare form of congenital tracheoesophageal fistula in which there is no oesophageal atresia, manifest as aspiration pneumonias. ... Synonym: H-type tracheoesophageal fistula. ... (05 Mar 2000) ...

H-V conduction time
Synonym for intraventricular conduction ... Conduction of the cardiac impulse through the ventricular myocardium, represented by the QRS complex in the electrocardiogram. H-R conduction time is from the onset of the first high frequency component of the His bundle electrogram to the onset of the QRS complex of the surface electrocardiogram (normally …

H-V interval
The time from the initial deflection of the His bundle (H) potential and the onset of ventricular activity (normally 35-45 msec). ... (05 Mar 2000) ...

h-y antigen
A sex-specific cell surface antigen produced by the sex-determining gene of the y chromosome in mammals. It causes syngeneic grafts from males to females to be rejected and interacts with somatic elements of the embryologic undifferentiated gonad to produce testicular organogenesis. ... (12 Dec 1998) ...

H2 antagonist
<pharmacology> A class of anti-ulcer medication which work through the inhibition of basal and nocturnal gastric acid secretion by competitive inhibition of the action of histamine at histamine H2 receptor sites on the parietal cells. ... Drugs of this type block gastric acid secretion and are therefore clinically useful in treating duodenal u …

H2 blocker
Synonym for H2 antagonist ... <pharmacology> A class of anti-ulcer medication which work through the inhibition of basal and nocturnal gastric acid secretion by competitive inhibition of the action of histamine at histamine H2 receptor sites on the parietal cells. ... Drugs of this type block gastric acid secretion and are therefore clinically …

H2 histocompatibility
<immunology> The ability of a tissue to be grafted from a donor to a host, without the host's immune system attacking the grafted tissue. ... The chances of H2 histocompatibility is determined by how well the tissue proteins (cell surface glycoproteins in the tissue, to be specific) match between donor and host. ... (09 Oct 1997) ...

H2Q
Symbol for ubiquinol. ... (05 Mar 2000) ...

ha
An exclamation denoting surprise, joy, or grief. Both as uttered and as written, it expresses a great variety of emotions, determined by the tone or the context. When repeated, ha, ha, it is an expression of laughter, satisfaction, or triumph, sometimes of derisive laughter; or sometimes it is equivalent to 'Well, it is so.' 'Ha-has, and inarticula …

HA1 virus
Synonym for haemadsorption virus type 1 ... parainfluenza virus type 3 ...

HA2 virus
Synonym for haemadsorption virus type 2 ... parainfluenza virus type 1 ...

haak
<marine biology> A sea fish. See Hake. ... (16 Mar 1998) ...

haarscheibe tumour
Synonym for trichodiscoma ... Dominantly inherited or nonfamilial elliptical parafollicular mesenchymal hamartomas. ... Synonym: haarscheibe tumour. ... (05 Mar 2000) ...

Haase's rule
The length of the foetus in centimeters, divided by 5, is the duration of pregnancy in months, i.e., the age of the foetus. ... (05 Mar 2000) ...

habena
1. A frenum or restricting fibrous band. ... 2. A restraining bandage. ... Synonym: habenula. ... Origin: L. Strap ... (05 Mar 2000) ...

habenal
Relating to a habena. ... (05 Mar 2000) ...

habenula
A small protuberance at the dorsal, posterior corner of the wall of the third ventricle, adjacent to the dorsal thalamus and pineal body. It contains the habenular nuclei and is a major part of the epithalamus. ... (12 Dec 1998) ...

habenula of caecum
Extension of the mesocolic tenia, dorsal or ventral to the terminal ileum. ... (05 Mar 2000) ...

habenula urethralis
One of two fine, whitish lines running from the meatus urethrae to the clitoris in girls and young women; the vestiges of the anterior part of the corpus spongiosum. ... (05 Mar 2000) ...

habenulae perforata
Synonym for foramina nervosa ... The perforations along the tympanic lip of the spiral lamina giving passage to the cochlear nerves. ... Synonym: habenulae perforata, zona perforata. ... (05 Mar 2000) ...

habenular
Relating to a habenula, especially the stalk of the pineal body. ... (05 Mar 2000) ...

habenular commissure
Synonym for commissura habenularum ... The connection between the right and left habenular nuclei; the decussation of fibres of the two striae medullares, forming the dorsal portion of the peduncle of the pineal body. ... Synonym: commissure of habenulae, habenular commissure. ... (05 Mar 2000) ...

habenular nucleus
The gray matter of the habenula, composed of a small-celled medial and a larger-celled lateral habenular nucleus; both nuclei receive fibres from basal forebrain regions (septum, basal nucleus, lateral preoptic nucleus); the lateral habenular nucleus receives an additional projection from the medial segment of the globus pallidus. Both nuclei proje …

habenular sulcus
A small groove located between the habenular trigone and the adjacent dorsal thalamus. ... (05 Mar 2000) ...

habenular trigone
A small triangular area on the dorsomedial surface of the thalamus at the caudal end of the medullary stria, corresponding to the underlying habenula. ... Synonym: trigonum habenulae, trigone of habenula. ... (05 Mar 2000) ...

habenulointerpeduncular tract
Synonym for retroflex fasciculus ... A compact bundle of fibres arising in the habenula and passing ventralward to the interpeduncular nucleus at the base of the midbrain; part of its fibres bypass this nucleus and terminate in the raphe nuclei of the caudal mesencephalic tegmentum. ... Synonym: fasciculus retroflexus, habenulointerpeduncular tract, …

habenulopeduncular tract
Synonym for tractus habenulopeduncularis ... habenulopeduncular tract ...

Haber-Weiss reaction
The reaction of superoxide (O2-- with hydrogen peroxide to produce molecular oxygen (O2), hydroxide radical (OH-), and OH-; often, iron catalyzed; a source of oxidative stress in blood cells and various tissues. ... (05 Mar 2000) ...

Haber, Henry
<person> 20th century British dermatologist. ... See: Haber's syndrome. ... (05 Mar 2000) ...

Haber's syndrome
<syndrome> A permanent flushing and telangiectasia of the cheeks, nose, forehead, and chin, with prominent follicular openings, small papules with scaling, and minute pitted areas; occasionally accompanied by scaly and keratotic lesions of the trunk. ... (05 Mar 2000) ...

haberdasher
1. A dealer in small wares, as tapes, pins, needles, and thread; also, a hatter. 'The haberdasher heapeth wealth by hats.' (Gascoigne) ... 2. A dealer in drapery goods of various descriptions, as laces, silks, trimmings, etc. ... Origin: Prob. Fr. Icel. Hapurtask trumpery, trifles, perh. Through French. It is possibly akin to E. Haversack, and to Ice …

Habermann, R
<person> German dermatologist, 1884-1941. ... See: Mucha-Habermann disease, Mucha-Habermann syndrome. ... (05 Mar 2000) ...

habit
<botany> The growth form of a plant, comprising its size, shape, texture and orientation. ... (09 Oct 1997) ...

habit chorea
Synonym for tic ... <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. ... (18 Nov 1997) ...

habit scoliosis
Scoliosis supposedly due to habitual standing or sitting in an improper position. ... (05 Mar 2000) ...

habit spasm
Synonym for tic ... <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. ... (18 Nov 1997) ...

habit tic
A habitual repetition of some grimace, shrug of the shoulder, twisting or jerking of the head, or the like. ... (05 Mar 2000) ...

habitat
<ecology, zoology> The physical location or type of environment in which an organism or biological population lives or occurs. ... The place occupied by an organism, population, or community. It is the physical part of the community structure in which an organism finds its home, and includes the sum total of all the environmental conditions pr …

habitat component
<ecology> A single element (for example, velocity, depth, cover, etc.) of the habitat or environment in which a fish or other aquatic species or population may live or occur. ... (09 Oct 1997) ...

habitat type
<ecology> A land or aquatic unit, consisting of an aggregation of habitats having equivalent structure, function, and responses to disturbance. ... (09 Oct 1997) ...

habits
Acquired or learned responses which are regularly manifested. ... (12 Dec 1998) ...

habitual
<psychology> Of the nature of a habit, according to habit, established by or repeated by force of habit, customary. ... (18 Nov 1997) ...

habitual abortion
A condition in which a woman has had three or more consecutive, spontaneous abortion's. ... (05 Mar 2000) ...

habituation
1. <physiology> The tendency of some neurons to require either a stronger nerve signal or a longer recharge period before it can fire again, if it has been triggered recently. ... 2. <psychology> The disappearance of responsiveness to accustomed stimulation. It does not include drug habituation. ... (03 Jul 1999) ...

habitude
1. Habitual attitude; usual or accustomed state with reference to something else; established or usual relations. 'The same ideas having immutably the same habitudes one to another.' (Locke) 'The verdict of the judges was biased by nothing else than heir habitudes of thinking.' (Landor) ... 2. Habitual association, intercourse, or familiarity. 'To w …

habromania
<psychiatry> Rarely used term for a morbid impulse toward gaiety. ... Origin: G. Habros, graceful, + mania, insanity ... (05 Mar 2000) ...

habronaemiasis
Infection of horses with any nematodes of the genus Habronema; commonly denotes wound infections that contain the larvae of this worm. ... (05 Mar 2000) ...

Habronema
A genus of spiruroid nematodes inhabiting the stomach of horses. The larvae develop in housefly and stable fly maggots living in manure, become infective when the fly larvae pupate, and are carried by adult flies to open wounds on horses, where they are left and cause cutaneous habronaemiasis; reinfection of the horse's stomach by Habronema occurs …

Habronema majus
One of two species (the other being Habronema microstoma) similar in appearance, hosts, distribution, and life cycle to Habronema muscae; the intermediate host is the stable fly, Stomoxys calcitrans. ... (05 Mar 2000) ...

Habronema megastoma
A species that causes tumours in gastric mucosa containing large numbers of the small nematodes; the larvae cause cutaneous habronaemiasis; the intermediate host is the common housefly, Musca domestica. ... (05 Mar 2000) ...

Habronema microstoma
Synonym for Habronema majus ... One of two species (the other being Habronema microstoma) similar in appearance, hosts, distribution, and life cycle to Habronema muscae; the intermediate host is the stable fly, Stomoxys calcitrans. ... (05 Mar 2000) ...

Habronema muscae
A species that occurs in the stomach of the horse, mule, ass, or zebra; the intermediate host is the common housefly, Musca domestica, or related flies. ... (05 Mar 2000) ...

HACEK group
A group of Gram-negative bacteria that includes Haemophilus spp., Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae. Bacteria in this group have in common a culture requirement of an enhanced carbon dioxide atmosphere and ability to infect human heart valves. ... (05 Mar 2000) ...

hacienda
A large estate where work of any kind is done, as agriculture, manufacturing, mining, or raising of animals; a cultivated farm, with a good house, in distinction from a farming establishment with rude huts for herdsmen, etc.; a word used in Spanish-American regions. ... Origin: Sp, fr. OSp. Facienda employment, estate, fr. L. Facienda, pl. Of facien …

hackbolt
<zoology> The greater shearwater or hagdon. See Hagdon. ... (01 Mar 1998) ...

hacking
A chopping stroke made with the edge of the hand in massage. ... (05 Mar 2000) ...

haddock
<zoology> A marine food fish (Melanogrammus aeglefinus), allied to the cod, inhabiting the northern coasts of Europe and America. It has a dark lateral line and a black spot on each side of the body, just back of the gills. Galled also haddie, and dickie. Norway haddock, a marine edible fish (Sebastes marinus) of Northern Europe and America. …

Hadfield, Geoffrey
<person> British physician, *1889. ... See: Clarke-Hadfield syndrome. ... (05 Mar 2000) ...

hadron
<physics> Any of over 100 elementary particles that are the building blocks of atomic particles such as protons and neutrons. ... (09 Oct 1997) ...

Hadrurus
A genus of scorpions found in the southwestern U.S., characterised by numerous setae on the stinger; the commonest species is Hadrurus arizonensis, the olive hairy scorpion. ... See: Scorpionida. ... Origin: G. Hadros, thick, stout, + ouro, tail ... (05 Mar 2000) ...

Haeckel, Ernst
<person> German naturalist, 1834-1919. ... See: Haeckel's gastrea theory, Haeckel's law. ... (05 Mar 2000) ...

Haeckel's gastrea theory
That the two-layered gastrula is the ancestral form of all multicellular animals. ... Synonym: gastrea theory. ... (05 Mar 2000) ...

Haeckel's law
Synonym for recapitulation theory ... The theory formulated by E.H. Haeckel that individuals in their embryonic development pass through stages similar in general structural plan to the stages their species passed through in its evolution; more technically phrased, the theory that ontogeny is an abbreviated recapitulation of phylogeny. ... Synonym: b …

haem
1. <biochemistry> Compounds of iron complexed in a porphyrin (tetrapyrrole) ring that differ in side chain composition. Haems are the prosthetic groups of cytochromes and are found in most oxygen carrier proteins. ... 2. <prefix> haem-, eaning relating to blood. ... Origin: G. Haima ... (21 Jun 2000) ...

haem a
A derivative of haem found in cytochrome aa3. ... (05 Mar 2000) ...

haem A-farnesyltransferase
<enzyme> Required for synthesis of cytochrome oxidase and haem a synthesis; found in mitochondria of saccharomyces cerevisiae; has been sequenced ... Registry number: EC 2.5.1.- ... Synonym: cox10 gene product, cox10 protein ... (26 Jun 1999) ...

haem c
A derivative of haem found in cytochromes c, b4, and f. ... (05 Mar 2000) ...

haem oxygenase (decyclizing)
<enzyme> A mixed function oxidase enzyme which during haemoglobin catabolism catalyses the degradation of haem to ferrous iron, carbon monoxide and biliverdin in the presence of molecular oxygen and reduced NADPH. The enzyme is induced by metals, particularly cobalt. ... Chemical name: Haem,hydrogen-donor:oxygen oxidoreductase (alpha-methene-o …

haem polymerase
<enzyme> Malarial enzyme forms haemozoin from haem derived from haemoglobin; no information on mechanism 2/92 ... Registry number: EC 2.- ... Synonym: haem polymerase ... (26 Jun 1999) ...

haemachrosis
An intensified redness of the blood. ... Origin: haema-+ G. Chrosis, colouration ... (05 Mar 2000) ...

haemacyanin
<physiology> A substance found in the blood of the octopus, which gives to it its blue colour. ... When deprived of oxygen it is colourless, but becomes quickly blue in contact with oxygen, and is then generally called oxyhaemacyanin. A similar blue colouring matter has been detected in small quantity in the blood of other animals and in the b …

haemacyte
<haematology> A red blood cell. ... (27 Sep 1997) ...

haemacytometer
<instrument, microscopy> A glass slide with a chamber for counting blood corpuscles in a given volume. The cells are 0.1 mm deep and are made with several types of ruling. Such cells are convenient counting chambers for many other kinds of suspensions. ... (05 Aug 1998) ...

haemacytozoon
Synonym for haemocytozoon ... A protozoon parasite of the blood cells. ... Synonym: haemacytozoon, haematocytozoon. ... Origin: haemo-+ G. Kytos, cell, + zoon, animal ... (05 Mar 2000) ...

Haemadipsa ceylonica
<zoology> A species of land leech found in Sri Lanka; it attaches itself to the skin of animals or humans. Its bite is painful, and numerous bites may cause anaemia. ... Origin: G. Haima, blood, + dipsa, thirst ... (05 Mar 2000) ...

haemadostenosis
Contraction of the arteries. ... Origin: G. Haimas (haimad-), a stream of blood, + stenosis, a narrowing ... (05 Mar 2000) ...

haemadremometer
Synonym for haemadrometer ... haemadremometer ...

haemadrometer
Synonym for haemadremometer ... haemadrometer ...

haemadrometry
Synonym for haemadromometry ... haemadrometry ...

haemadromometer
Synonym for haemodromometer ... Rarely used term(s) for an instrument for measuring the rapidity of the blood circulation. ... Synonym: haemadrometer, haemadromometer. ... Origin: haemo-+ G. Dromos, course, + metron, measure ... (05 Mar 2000) ...

haemadromometry
Synonym for haemadrometry ... haemadromometry ...

haemadsorption
<haematology> The clumping together of red blood cells to other cells or particles, or to substrates. ... The sticking of red blood cells to cells which have been infected with certain types of haemagglutinating viruses. Similar to haemagglutination. ... (09 Oct 1997) ...

haemadsorption test
<investigation> A clinical lab test which is used to detect the presence of haemagglutinating viruses (virus which causes haemadsorption) based on whether red blood cells will stick to cells from the infected tissue when a haemagglutinin is present. ... (09 Oct 1997) ...

haemadsorption virus
<virology> An older term for certain influenza viruses. The two types are: haemadsorption virus type I - mostly in children, symptoms include bronchitis and pneumonia. Now called parainfluenza 3. ... Haemadsorption virus type 2 - is sometimes present in children who have a respiratory disease that includes high fever. Now called parainfluenza …

haemadsorption virus test
A method for detecting haemagglutinating viruses that is based on adherence of erythrocytes to infected cells. ... (05 Mar 2000) ...

haemadsorption virus type 1
parainfluenza virus type 3 ...

haemadsorption virus type 2
parainfluenza virus type 1 ...

haemadynameter
haemadynamometer ...

haemafacient
Synonym for haemopoietic ... <pharmacology> Refers to an agent or process that affects or promotes the formation of blood cells. ... (09 Oct 1997) ...

haemagglutinating cold autoantibody
A cold autoagglutinin. ... (05 Mar 2000) ...