نتایج جستجو برای: permeability coefficient

تعداد نتایج: 217403  

Journal: :Investigative ophthalmology 1974
Y Ota S Mishima D M Maurice

A new method was developed for the analysis of fluorescein exchange between the aqueous humor and cornea which enables calculation of the permeability coefficient of the corneal endothelium and the steady-state aqueous-cornea distribution ratio from one experiment. After intravenous fluorescein injection, aqueous and corneal fluorescence was measured at intervals, using an objective fluorophoto...

Journal: :Water research 2013
Ming Xie Long D Nghiem William E Price Menachem Elimelech

The impact of humic acid fouling on the membrane transport of two pharmaceutically active compounds (PhACs) - namely carbamazepine and sulfamethoxazole - in forward osmosis (FO) was investigated. Deposition of humic acid onto the membrane surface was promoted by the complexation with calcium ions in the feed solution and the increase in ionic strength at the membrane surface due to the reverse ...

2013
D. P. GEORGESCU

In order to achieve a fair description of radon transport through concrete certain information is needed on the concrete structure, porosity and permeability, on processes causing the transport of radon, on radon’s interaction with environment, factors favouring the generation of radon, etc. The concrete characteristics (that depend on its composition and especially on the W/C ratio) which infl...

Journal: :American journal of physiology. Lung cellular and molecular physiology 2004
James C Parker Mary I Townsley

Lung injury is a broad descriptor that can be applied to conditions ranging from mild interstitial edema without cellular injury to massive and fatal destruction of the lung. This review addresses those methods that can be readily applied to rats and mice whose small size limits the techniques that can be practically used to assess injury. The methodologies employed range from nonspecific measu...

Journal: :Biological & pharmaceutical bulletin 2010
Wen-Jun Yao Kao-Xiang Sun Yi Liu Na Liang Hong-Jie Mu Chen Yao Rong-Cai Liang Ai-Ping Wang

The aim of this study was to investigate the effect of Poly(amidoamine) (PAMAM) dendrimers on corneal permeation of puerarin (PUE). Permeation studies were performed using excised cornea of rabbits by a Valia-Chien diffusion apparatus. Drug-treatment studies were carried out by measuring the penetration of puerarin on cornea in PAMAM-PUE physical mixture or PAMAM-PUE complex, and cornea-treatme...

Journal: :jundishapur journal of natural pharmaceutical products 0
eskandar moghimipour nanotechnology research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of pharmaceutics, faculty of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran anayatollah salami nanotechnology research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of pharmaceutics, faculty of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; corresponding author: anayatollah salami, department of pharmaceutics, faculty of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-6133738381 mahsa monjezi department of pharmaceutics, faculty of pharmacy, ahvaz jundishapur university of medical sciences, ahvaz, ir iran

materials and methods liposomes were prepared by thin film method using soya lecithin and cholesterol. physicochemical characteristics of the liposomes such as, particle size, drug encapsulation efficiency were determined. also, drug release and in vitro skin permeability through rat skin were evaluated using franz diffusion cells. results the results showed that the maximum drug encapsulation ...

Journal: :The Journal of General Physiology 1970
Y. Lange R. V. Lange A. K. Solomon

Unidirectional (24)Na fluxes across the dog red blood cell membrane were measured. The kinetics were incompatible with a single time constant but could be accounted for in terms of a two-series compartment cell model, with approximately 1% of cell Na in the outer compartment. Dog red blood cells are known to be inhomogeneous in their Na and K permeabilities. Theoretical analysis showed that suc...

Journal: :The Journal of General Physiology 1967
Albert Cass Alan Finkelstein

The osmotic permeability coefficient, P(f), and the tagged water permeability coefficient, P(d), were determined for thin (<100 A) lipid membranes formed from ox brain lipids plus DL-alpha-tocopherol; their value of approximately 1 x 10(-3) cm/sec is within the range reported for plasma membranes. It was established that P(f) = P(d). Other reports that P(f) > P(d) can be attributed to the prese...

1997
Graham H. Galbraith Craig McLean Jiansong Guo

The physics of moisture transfer is complex and as a result modelling is normally carried out on a macroscopic basis, with empirical coefficients used to simulate the transport process. These coefficients are not single values but depend on the moisture content of the material. The application of this data within the simulation environment requires the determination of a systematic methodology ...

Journal: :فیزیک زمین و فضا 0
کیوان نجف زاده دانشجوی کارشناسی ارشد، گروه فیزیک زمین، موسسه ژئوفیزیک، دانشگاه تهران، ایران محمدعلی ریاحی دانشیار، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران محسن سیدعلی کارشناس ارشد مهندسی اکتشاف نفت، تهران، ایران

permeability is a key parameter in reservoir characterization. in fact, without accurate information about reservoir permeability, there is no good solution for reservoir engineering problems. up to now, permeability values of a reservoir have been calculated through laboratory measurements or well testing methods. these methods are useful but they cannot describe a reservoir reliably and preci...

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