Results 151 to 160 of about 8,010 (187)

Enzyme immobilisation in permselective microcapsules

Journal of Microencapsulation, 2011
The objective of this investigation was to study the permselective behaviour of calcium alginate membranes, including the modifying effects of silica additives, which were subsequently used as microcapsule shells. Diffusion experiments and HPLC were carried out to ascertain the size-exclusion property of the membranes for a mixed molecular-weight ...
Pavadee, Pachariyanon, Ekkehard, Barth, David W, Agar   +2 more
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Hemodynamic Effects on Glomerular Permselectivity

American Journal of Nephrology, 1990
Glomerular capillary hemodynamics influence glomerular permselectivity to macromolecules, and alterations in these factors can evoke proteinuria. Changes in hemodynamic patterns can alter protein flux by changing its diffusion- or concentration-driven movement in the presence of a constant membrane barrier. Alternatively, hemodynamic forces may disrupt,
T H, Hostetter, M E, Rosenberg
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Permselectivity of the peritoneal membrane

Microvascular Research, 1985
To investigate the osmotic barrier characteristics of the peritoneal membrane during conditions similar to peritoneal dialysis in man, yet transperitoneal fluid movement was measured in 20 cats following intraabdominal placement of isotonic saline and hypertonic solutions of NaCl, glucose, raffinose, and inulin. Also, isooncotic solutions of hemoglobin
B, Rippe, M A, Perry, D N, Granger
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Biophysical basis of glomerular permselectivity

The Journal of Membrane Biology, 1983
The mammalian glomerular capillary wall normally restricts the transmural passage of plasma proteins while offering little resistance to the filtration of water and small solutes. The basis for this selectivity has been explored extensively in recent years, through clearance measurements of endogenous (mainly albumin, transferrin, and immunoglobulins ...
W M, Deen, C R, Bridges, B M, Brenner
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Transport through permselective membranes

Journal of Macromolecular Science, Part B, 1971
Abstract The nature of selective penetrant permeability of synthetic polymer membranes is reviewed and discussed in terms of some of the factors that most affect the transport behavior. The interdependence of these factors is emphasized for diffusion and sorption in structurally heterogeneous membranes.
C. E. Rogers, S. Sternberg
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Electronmicroscopy of Permselective Membranes

Israel Journal of Chemistry, 1966
AbstractAqueous regions within cationic permselective membranes were filled by cathodically deposited silver and sections made of this material were observed in the electron microscope. The silver itself deformed the matrix and crystallized in large globules, but the background of the micrographs, the Ag form of the membrane, showed characteristic ...
F. de Körösy, E. Zeigerson
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Glomerular permselection: Shape and flow

Journal of Theoretical Biology, 1984
The selective permeability of the glomerular basement membrane to macromolecules is a function of the size and charge of the macromolecule. Evidence suggests that shape may also be a factor. The orientation of macromolecules in solution is dependent on their size, shape, and frictional interactions with moving solvent molecules.
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Permselective Membranes: Spectroscopic and Conductivity Effects

Science, 1963
The absorption spectrum of permselective ion-exchange membranes containing positively charged groups shows specific effects which depend on the nature of the negative gegenion used. Such colored permselective membranes with positive or negative functional groups show increased conductivity after illumination with light flashes.
G, Stein, C, Forgacs
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Permselective silicon-containing vinyl copolymers

Polymer, 1994
Abstract This paper presents the synthesis of copolymers of vinyl p-t-butylbenzoate (PTBBA) with 3-methacryloxypropyltris(trimethylsiloxy)silane (Si-1) and their permselective properties for oxygen and nitrogen. Analysis of the glass transition temperature profile by the Kwei equation implied the existence of some interaction between PTBBA and Si-1 ...
Naoto Tsutsumi, Yoshitsugu Nishikawa, Tsuyoshi Kiyotsukuri, Minoru Nagata   +3 more
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Mechanisms of Glomerular Permselectivity

1983
The hydraulic pressure gradient acting across the glomerular capillary wall serves as the principal driving force for the separation of plasma into a nearly ideal ultrafiltrate. In spite of its remarkably low resistance to water flow, however, this capillary network retains within it the plasma proteins, so that only a small fraction of these ...
Barry M. Brenner, Thomas H. Hostetter
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