Results 221 to 230 of about 353,183 (265)
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Reduction in Water Permeability of the Rabbit Conjunctival Epithelium by Hypotonicity
Experimental Eye Research, 1998The effects of unilateral exposure to hypotonic media on the diffusional water permeability of the isolated rabbit conjunctiva were determined. For these experiments, a segment of the bulbar-palpebral conjunctiva was mounted between Ussing-type hemichambers under short-circuited conditions. Unidirectional diffusional water fluxes (Jdw) were measured in
O A, Candia, X P, Shi, L J, Alvarez
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Permeability Reduction in Water Sensitivity of Sandstones
1981A model was developed to describe the rapid decline of permeability of Berea sandstone resulting from its water sensitivity. The model is based on the release and capture of clay particles. The release of clay particles from the pore wall is approximated as a first order decay process and the rate at which particles leave the suspension to plug the ...
K. C. Khilar, H. S. Fogler
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Reduction of Shale Permeability by Temperature-Induced Creep
SPE Journal, 2020SummaryThe effects of temperature on the permeability coefficients of carbonaceous shales and the underlying mechanisms have been investigated experimentally. Pressure-pulse-decay gas-permeability tests were performed on seven shale plugs with different lithological compositions, organic-matter contents ranging from 0.8 to 11.7% total organic carbon ...
Qian Zhang +4 more
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Assay of ribonucleotide reduction in nucleotide‐permeable hamster cells
Journal of Cellular Physiology, 1978AbstractRibonucleotide reduction was measured in Chinese hamster ovary cells made permeable to nucleotides by treatment with the detergent Tween‐80. When compared to the respective ribonucleotide reductase activity in partially purified cell extracts, CDP and GDP reductase activities in permeabilized cells responded in a similar fashion to ...
W H, Lewis, B A, Kuzik, J A, Wright
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Permeability Reduction Due to Salinity Changes
Journal of Canadian Petroleum Technology, 1968Abstract X-ray diffraction, base exchange studies and core flood tests were made to explain the reduction in permeability of Berea sandstone which results from changing the salinity of flood water. It was shown that the reduction of permeability is related to the exchangeable cations on the clays and to particle ...
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β2-Adrenoceptors mediate a reduction in endothelial permeability in vitro
European Journal of Pharmacology, 1995The permeability of bovine pulmonary artery endothelial (CPAE) monolayers to Evans blue-labelled albumin (Evans blue-albumin) has been measured in vitro. Thrombin caused a concentration-dependent increase in Evans blue-albumin clearance across endothelial monolayers.
M J, Allen, R A, Coleman
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Governing Mechanism of Disproportionate Permeability Reduction
Journal of Petroleum Technology, 2001This article is a synopsis of paper SPE 71510, "Segregated Flow is the Governing Mechanism of Disproportionate Permeability Reduction in Water and Gas Shutoff," by A. Stavland, SPE, and S. Nilsson, RF-Rogaland Research, originally presented at the 2001 SPE Annual Technical Conference and Exhibition, New Orleans, 30 September-3 October.
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Influence of Syneresis on Permeability Reduction by Polymer Gels
SPE Production & Facilities, 1996Summary Syneresis is commonly believed to be incompatible with the application of polymer gels to reduce the permeability of porous media. In this paper, it is shown that, although the permeability of a geltreated porous medium does increase as syneresis proceeds, the degree of permeability reduction in cores remains technologically ...
S. L. Bryant +2 more
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Modeling of Permeability Reduction in Bioclogged Porous Sediments
Journal of Geotechnical and Geoenvironmental Engineering, 2018AbstractThis study examines the use of a numerical model to predict the reduction in permeability of bioclogged specimens observed from column experiments.
Babak Abbasi +5 more
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Effect of Flow Rate on Disproportionate Permeability Reduction
International Symposium on Oilfield Chemistry, 2003Abstract Disproportionate permeability reduction (DPR), in which water permeability is reduced to a much greater extent than oil permeability, has been observed in a number of polymer gel systems. Although several different mechanisms have been proposed, no one mechanism has been generally accepted.
S. Ganguly +3 more
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