| apolipoproteins | The protein components of lipoproteins which remain after the lipids to which the proteins are bound have been removed. They play an important role in lipid transport and metabolism. (12 Dec 1998) |
|---|---|
| apolipoproteins a | Lipoproteins found in human blood serum in the high-density and very-high-density lipoprotein fraction (hdl, vhdl). They consist of several different polypeptides, the most important of which are apolipoprotein a-I and a-II. They maintain the structural integrity of the hdl particles and are activators of lecithin:cholesterol acyltransferase (lcat). Atherosclerotic patients show low apolipoprotein a levels and these apolipoproteins are either absent or present in extremely low plasma concentration in tangier disease. (12 Dec 1998) |
| apolipoproteins b | Structural proteins of chylomicrons, vldl, and ldl. They are important in the secretion and transport of these lipoproteins and represent the binding proteins for the ldl receptor pathway. Atherosclerotic patients show high levels of apo b in the blood while in the case of abetalipoproteinaemia they are not detectable in serum. (12 Dec 1998) |
| apolipoproteins c | Lipoproteins located on the surface of vldl. They are transferred to hdl throughout the catabolism of vldl and affect lipoprotein lipase activity. A genetic lack of apo c-II results in hyperglyceridemia and low levels of hdl. Another form of hyperglyceridemia with normal apo c-II levels is caused by a high concentration of apo c-III in vldl. (12 Dec 1998) |
| apolipoproteins e | Prominent protein constituents of plasma vldl, chylomicrons, and a subfraction of hdl as well as of remnant lipoproteins which are derived from the lipoprotein lipase-mediated intravascular catabolism of triglyceride-rich lipoproteins. Apolipoproteins e are recognised by the ldl receptor and apo e receptor. Any defect in the apo e metabolism leads to increased plasma apo e levels. A strong association has been found between high levels of apo e and type III hyperlipoproteinaemia. (12 Dec 1998) |
| apollo | A deity among the Greeks and Romans. He was the god of light and day (the "sun god"), of archery, prophecy, medicine, poetry, and music, etc, and was represented as the model of manly grace and beauty; called also Phebus. The Apollo Belvedere, a celebrated statue of Apollo in the Belvedere gallery of the Vatican palace at Rome, esteemed of the noblest representations of the human frame. Origin: L. Apollo, -linis, Gr. Source: Websters Dictionary (01 Mar 1998) |
| apologetical | Defending by words or arguments; said or written in defense, or by way of apology; regretfully excusing; as, an apologetic essay. "To speak in a subdued and apologetic tone." Origin: Gr, fr. To speak in defense of; from + speech, to say, to speak. See Logic. Source: Websters Dictionary (01 Mar 1998) |
| apologetically | By way of apology. Source: Websters Dictionary (01 Mar 1998) |
| apologetics | That branch of theology which defends the Holy Scriptures, and sets forth the evidence of their divine authority. Source: Websters Dictionary (01 Mar 1998) |
| apologist | One who makes an apology; one who speaks or writes in defense of a faith, a cause, or an institution; especially, one who argues in defense of Christianity. Origin: Cf. F. Apologiste. Source: Websters Dictionary (01 Mar 1998) |
| apologize | 1. To make an apology or defense. 2. To make an apology or excuse; to make acknowledgment of some fault or offense, with expression of regret for it, by way of amends; with for; as, my correspondent apologized for not answering my letter. "To apologize for his insolent language." (Froude) Origin: Cf. F. Apologiser. Source: Websters Dictionary (01 Mar 1998) |
| apologizer | One who makes an apology; an apologist. Source: Websters Dictionary (01 Mar 1998) |
| apomict | <plant biology> A plant that produces viable seed without fertilization. (09 Oct 1997) |
| apomixia | Synonym: parthenogenesis. Origin: G. Apo, from, + mixis, a mingling (05 Mar 2000) |
| apomixis | <plant biology> In general, reproducing without sexual reproduction, often used to denote seed production without a sexual process having been involved. (09 Oct 1997) |