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Glossary of Biochemistry Terms
beginning with letter H
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HDL Tweet Definition of HDL Like Definition of HDL on Facebook
initialism (wikipedia, High density lipoprotein)
  1. High-Density Lipoproteins
helix Tweet Definition of helix Like Definition of helix on Facebook
noun (helixes, pl2=helices)
  1. (mathematics) A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
  2. (architecture) A small volute under the abacus of a Corinthian capital.
  3. (anatomy) The incurved rim of the external ear.
proper nounHelix
  1. (zoology) A genus of land snail containing many species.
hematopoiesis Tweet Definition of hematopoiesis Like Definition of hematopoiesis on Facebook
noun
  1. (cytology) The process by which blood cells are produced; hematogenesis.
heme Tweet Definition of heme Like Definition of heme on Facebook
noun (uncountable)
  1. The component of hemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.
hemin Tweet Definition of hemin Like Definition of hemin on Facebook
noun
  1. a reddish brown substance produced in a laboratory test for the presence of blood by reaction with glacial acetic acid and sodium chloride
hemocyanin Tweet Definition of hemocyanin Like Definition of hemocyanin on Facebook
noun
  1. (biochemistry) a blue copper-containing respiratory pigment (a metalloprotein) found in most molluscs, and some arthropods
hemodialysis Tweet Definition of hemodialysis Like Definition of hemodialysis on Facebook
noun
  1. (medicine) the use of dialysis to remove waste products from the blood in the case of kidney failure
hemoglobin Tweet Definition of hemoglobin Like Definition of hemoglobin on Facebook
noun
  1. The iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body; it consists of a protein (globulin), and haem (a porphyrin ring with an atom of iron at its centre).
heparin Tweet Definition of heparin Like Definition of heparin on Facebook
noun
  1. an anticoagulant compound originally isolated from liver cells, now made synthetically for medical use
hesperidin Tweet Definition of hesperidin Like Definition of hesperidin on Facebook
nounHesperidin
  1. A citrus flavonoid compound, reported as the predominant flavonoid in lemons and oranges. Chemically, it is hesperetin-7-rutinoside, viz. (S)-7-[6-0-(6-deoxy-alpha-L-mannopyranosyl)-beta-D-glucopyranosyl oxy]-2,3-dihydro-5-hydroxy-2-(3-hydroxy-4-methoxyphenyl)-4H-1-benzopyran-4-one.
heteroauxin Tweet Definition of heteroauxin Like Definition of heteroauxin on Facebook
noun
  1. A growth promoting hormone, 3-indoleacetic acid, occuring in some plants
high-density lipoprotein Tweet Definition of high-density lipoprotein Like Definition of high-density lipoprotein on Facebook
noun
  1. a class of lipoprotein that transports cholesterol to the liver from other tissue; high levels may decrease the risk of coronary heart disease
His Tweet Definition of His Like Definition of His on Facebook
adjective
  1. (possessive, lang=English) Belonging to God.
God asked, where is incarnate deity.
histaminase Tweet Definition of histaminase Like Definition of histaminase on Facebook
noun
  1. a widely occurring flavoprotein enzyme that oxidizes histamine and various diamines
histidine Tweet Definition of histidine Like Definition of histidine on Facebook
noun
  1. (amino acid) An essential amino acid C6H9N3O2 found in most animal proteins; essential for tissue growth and repair.
histone Tweet Definition of histone Like Definition of histone on Facebook
noun
  1. Any of various simple water soluble proteins that are rich in the basic amino acids lysine and arginine and are complexed with DNA in the nucleosomes of eukaryotic chromatin.
hormone Tweet Definition of hormone Like Definition of hormone on Facebook
noun
  1. (physiology) Any substance, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity.
  2. (pharmacology) A synthetic compound with the same activity.
  3. Any similar substance in plants.
hydrocortisone Tweet Definition of hydrocortisone Like Definition of hydrocortisone on Facebook
noun
  1. (steroid hormone) A steroid hormone, produced by the adrenal cortex, that regulates the metabolism of carbohydrates and maintains blood pressure.
  2. (pharmaceutical drug) A synthetic version of this hormone used to treat Addison's disease and other conditions.
hydrolase Tweet Definition of hydrolase Like Definition of hydrolase on Facebook
noun
  1. (enzyme) An enzyme that catalyzes the hydrolysis of a substrate.
hydroxybutyric acid Tweet Definition of hydroxybutyric acid Like Definition of hydroxybutyric acid on Facebook
noun
  1. (chemistry) either of the isomeric compounds formed from a butyric acid by substituting a hydrogen atom with a hydroxyl group
    • alphahydroxybutyric acid - 2-hydroxy-butanoic acid
    • betahydroxybutyric acid - 3-hydroxy-butanoic acid
    • gammahydroxybutyric acid - 4-hydroxy-butanoic acid
    • 2-hydroxy, 2-methylpropanoic acid
    • 3-hydroxy, 2-methylpropanoic acid

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