Many of the scientific terms found in the abstracts, articles and lay translations presented on our site are included in this section. We are continually adding terminology found in both new and existing documents.
| H cell | headache |
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Horizontal cell.
Pain in the head; called also cephalalgia, cephalgia, and cephalodynia.
Horizontal cell.
See folliculus pili.
1. A set of alleles of a group of closely linked genes, which is usually inherited as a unit.
2. The genetic constitution of an individual at a set of closely linked genes on a given chromosome.
As H - symbol for hydrogen , Hauch , henry , Hounsfield unit , and hyperopia .
As H - symbol for enthalpy and magnetic field strength .
As h - symbol for hecto- and hour .
As h - symbol for Planck's constant and height .
A form of chronic leukemia marked by splenomegaly and by an abundance of abnormal large mononuclear cells covered by hairlike villi (hairy cells) in the bone marrow, spleen, liver, and peripheral blood. Called also leukemic reticuloendotheliosis.
A small molecule, not antigenic by itself, that can react with antibodies of appropriate specificity and elicit the formation of such antibodies when conjugated to a larger antigenic molecule, usually a protein, called in this context the carrier or schlepper. Antibody production involves activation of B lymphocytes by the hapten and helper T lymphocytes by the carrier.
The major histocompatibility antigens in mice.
1. In the singular: The time required for the decay of half of a sample of particles of a radionuclide or elementary particle, equal to 0.693 divided by the decay constant; symbol t½ or T½.
2. In the singular: Half-time.
A 100,000-dalton plasma glycoprotein with alpha electrophoretic mobility that irreversibly binds free hemoglobin resulting in prompt removal of the hemoglobin-haptoglobin complex by the liver, preventing loss of free hemoglobin in the urine. Haptoglobin levels are decreased by hemolysis and increased owing to increased synthesis in conditions resulting in extensive tissue damage and necrosis. Haptoglobin has two major genetic variants, designated Hp 1 and Hp 2.
The murine major histocompatibiliity complex.
1. The time required for the decay of half of a sample of particles of a radionuclide or elementary particle, equal to 0.693 divided by the decay constant; symbol t½ or T½.
2. Half-time.
Offers security, comfort, or shelter.
As H1 - Abbreviation for histamine1: the cellular receptor site for histamine responsible for the dilation of blood vessels and the contraction of smooth muscle.
As H1 - Symbol for alternative hypothesis .
1. In the singular: The time required for the decay of half of a sample of particles of a radionuclide or elementary particle, equal to 0.693 divided by the decay constant; symbol t½ or T½.
2. In the singular: Half-time.
Any of the family of high-sulfur keratin polypeptides that are constituents of the hair and nails. It usually occurs as an a helix and therefore is sometimes called a-keratin.
Abbreviation for histamine2: the cellular receptor site for histamine responsible for the stimulation of heart rate and gastric secretion.
The time required for one half of a quantity of a substance to be eliminated from a system when the substance is eliminated at a rate proportional to its concentration (i.e., exhibits first-order kinetics); symbol t½ or T½.
1. Induration (definition 2).
2. Sclerosis.
3. The procedure of rendering tissue firm, so that it may be more readily cut for purposes of microscopic examination.
Symbol for water.
1. A mark put on an article to indicate origin, purity, or genuineness.
2. A distinguishing characteristic.
Working together smoothly.
1. Lateral habenular nucleus (nucleus habenularis lateralis): The more dispersed of the two nerve cell groups situated deep to the habenular trigone; it receives fibers from the stris medullaris thalami and projects to the raphe nuclei, reticular formation of mesencephalon, pars compacta of substantia nigra, and hypothalamus and basal forebrain.
2. Medial habenular nucleus (nucleus habenularis medialis): The more densely packed of the two nerve cell groups situated deep to the habenular trigone; it receives fibers from the stria medullaris thalami and projects to the interpeduncular nucleus of the midbrain.
A sense perception without a source in the external world; a perception of an external stimulus object in the absence of such an object.
1. Disagreeably rough.
2. Causing discomfort or pain.
3. Unduly exacting; severe.
1. To gradually adapt to a stimulus or to the environment.
2. To extinguish or decrease a conditioned reflex over time by repetition of the conditioned stimulus.
Sense perceptions without a source in the external world; perceptions of an external stimulus object in the absence of such an object.
A source of danger.
See hematology .
1. A luminous or colored circle, such as the colored circle seen around a light in glaucoma.
2. A ring seen around the macula luteae in ophthalmoscopical examination.
3. The imprint of the ciliary processes upon the vitreous body.
4. A metal or plastic band that encircles the head or neck, providing support and stability as part of a halo orthosis.
Symbol for hemoglobin .
Bacterial pneumonia caused by infection with Haemophilus influenzae, seen mainly in young children and debilitated or immunocompromised adults; it sometimes progresses to life-threatening conditions such as meningitis, pericarditis, endocarditis, and epiglottitis that can cause obstruction of the airway.
Acute interstitial pneumonia.
Hypertrophic cardiomyopathy.
(HF), factor XII; see coagulation factor XII under factor .
Any member of four genera of the rodent family Muridae; genera used as laboratory animals are Cricetulus, Cricetus and Mesocricetus.
Abbreviation for hydrochlorothiazide. See JAB-620, et al.
1. A long slender filament.
2. Especially, in humans and other mammals, a threadlike outgrowth from the skin; also, a covering or growth of hairs of an animal or a body part.
1. The distal region of the upper limb, including the carpus, metacarpus, and digits. In official terminology, called manus.
2. An indicator or pointer on a dial.
3. Personal possession (usually used in the plural); control.
4. A pledge especially of betrothal.
5. Handwriting.
6. Skill, ability; also, a significant part.
7. Assistance; also, participation.
8. An outburst of applause.
9. A single round in a card game; also, the cards held by a player after a deal.
10. Worker, employee; also, a member of a ship's crew.
Symbol for helium.
Neuroepithelial cells with hairlike processes (kinocilia or stereocilia, or both) found in the organ of Corti, ampullar crest, and utricle and saccule of the inner ear; the hair cells receive afferent fibers and efferent fibers of the cochlear nerve (organ of Corti) or the vestibular nerve.
A flattened expansion at the end of the limb bud of the embryo, the precursor of the hand.
1. The front or upper part of the body containing the brain, the chief sense organs, and the mouth; caput.
2. The upper, anterior, or proximal extremity of a structure or body.
3. Mind; also, natural aptitude.
4. Poise.
5. The obverse of a coin.
6. Individual; also plural, one of a number (as of cattle).
7. The source of a stream.
8. Director, leader; also, a leading element.
9. A projecting part; also, the striking part of a weapon.
10. The place of leadership or honor.
11. A separate part or topic.
12. The foam on a fermenting or effervescing liquid.
13. Crisis.
14. Principal, chief.
15. To provide with or form a head.
16. Lead, conduct.
17. To get in front of; surpass.
18. To put or stand at the head.
19. To point or proceed in a certain direction.
See folliculus pili.
1. Having a single set of chromosomes, as normally carried by a gamete, or having one complete set of nonhomologous chromosomes. In man, the haploid number is 23. Symbol, n.
2. An individual or cell having only one member of each pair of homologous chromosomes.
Pain in the head; called also cephalalgia, cephalgia, and cephalodynia.