نتایج جستجو برای: klinkenberg permeability
تعداد نتایج: 50262 فیلتر نتایج به سال:
Background—A familial defect in intestinal barrier function has been found in Crohn’s disease. Aim—To investigate possible genetic and environmental influences on this barrier defect by studying intestinal permeability in both relatives and spouses of patients with Crohn’s disease. Subjects—The study included 39 patients with Crohn’s disease, 34 healthy first degree relatives, and 22 spouses. T...
The role of changes in blood-brain barrier permeability in the pathogenesis of hepatic encephalopathy remains uncertain. To test the hypothesis that brain microvessel permeability is nonselectively increased in hepatic encephalopathy we measured the blood-brain barrier permeability-surface area product in rats with acute liver failure induced by intraperitoneal injection of galactosamine. The p...
Protons and sodium ions are the only used coupling ions in energy transduction in Bacteria and Archaea. At their growth temperature, the permeability of the cytoplasmic membrane of thermophilic bacteria to protons is high as compared to sodium ions. In some thermophiles, therefore, sodium is the sole energy coupling ion. Comparison of the protonand sodium permeability of the membranes of variet...
Recently neuro-inflammation and cognitive impairment has attracted attention. It has been suggested that obesity lead to cognitive impairments induced by neuro-inflammatory markers like nuclear factor kappa B (NF-kB) and reduced neurotrophin factors like brain-derived neurotrophic factor (BDNF) in the hippocampus. Also, increased blood brain barrier (BBB) permeability. Because of the neuro-prot...
The side effects of toxic trace elements such as lead in the exposed subjects have been investigated in past years. Lead disturbs microvascular system, and changes the plasma level of lipids and lipoproteins. In this research the role of lead in plasma lipids and endothelial permeability of aorta were studied. Two groups of white male rabbits were under investigation for forty days. Group I ...
The performances of two-phase polymer-liquid PEBAX®/polyethylene glycol (PEG) and three-phase polymer-liquid-solid PEBAX®/PEG/MWNT thin film composite membranes for CO2 and CH4 permeation were studied. The effect of temperature and MWNT/PEBAX® ratio on single gas (CO2 and CH4) permeability was investigated. The permeat...
The permeability and tortuosity of pore-scale two and three-dimensional random porous media were calculated using the Lattice Boltzmann method (LBM). Effects of geometrical parameters of medium on permeability and tortuosity were investigated as well. Two major models of random porous media were reconstructed by computerized tomography method: Randomly distributed rectangular obstacles in a uni...
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