polyanion


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Related to polyanion: Polycation

pol·y·an·i·on

(pol'ē-an'ī-on),
Anionic sites on proteoglycans in the renal glomeruli that restrict filtration of anionic molecules and facilitate filtration of cationic proteins; loss of polyanion may cause albuminuria in lipoid nephrosis.

pol·y·an·i·on

(pol'ē-an'ī-on)
Anionic sites on proteoglycans in the renal glomeruli that restrict filtration of anionic molecules and facilitate filtration of cationic proteins; loss of polyanion may cause albuminuria in lipoid nephrosis.
References in periodicals archive ?
As can be seen, the adsorption of PSS appears to have the typical high affinity that is close to literature data on adsorption of polyanion PSS on positively charged surface [alpha]-[Al.sub.2][O.sub.3] [17] or hematite [29].
Several recycling of the catalyst had only slightly decreased the catalytic activity, demonstrating the stability and retention capability of this useful polyanion. Recycling of the catalyst at the end of the reaction involved filtering the catalyst, washing with diethyl ether, and drying at 130[degrees]C for 1 h.
The latter of these, Preyssler's anion, is one of the largest known polyanions and important advantages of this polyanion over the Keggin and Dawson heteropolyacids are (i) more thermal stability, (ii) more hydrolytic stability (pH = 0-12), (iii) larger number of counter cations, and (iv) larger number of metal atoms.
Loss of glomerular polyanion correlated with albuminuria in experimental cadmium nephropathy.
DNA itself is a polyanion, a polymer with negative charges.
This stoichiometry indicates that every potential anionic site of the polyanion was associated with the dye cation and aggregation of such dye molecules was expected to lead to the formation of a card pack stacking of the individual monomers on the surface of the polyanion so that the allowed transition produces a blue-shifted metachromasy [27].
In a trial comparing the polyanion PRO 2000, the spermicide BufferGel, and placebo in 3099 African and US women, 36 women using 0.5% PRO 2000, 54 using BufferGel, and 53 using placebo picked up HIV.
Keratin produced via the oxidative sulfitolysis of wool was employed as the polyanion and ammonium functionalized cellulose (polyquarternium) was employed as the polycation.
(1986) believed that this salt effect is important in bringing clay particles close enough together so that several of them could be bound with a common polyanion.
(1999) proposed that the characteristic loss of foot processes or effacement is secondary to a loss of glomerular polyanions. The polyanion loss, mainly albumin, yields a reduction in the negative charge along the podocytes.
(2000) The crystal structure of Cu[[AlAsO.sub.5]]: a novel type of aluminoarsenate tetrahedral polyanion. Crystallographic Reports (in press).
The basement membrane is the major barrier to the passage of large molecules, such as proteins, because of both its permeability and the negatively charged glycosaminoglycans present in the basement membrane and polyanion lining of the epithelial foot processes.