Permeability an important property plays a key role in reservoir performance, numerical simulation, drilling and production planning. In such reservoirs, stress strain alters induced by extraction injection of fluid may substantially change permeability irreversible manner. With regard to this phenomenon, several reservoirs require consider straindependent permeability, order have accurate perf...


 The soft chemical method was adopted to prepare of cobalt-substituted nickel-zinc ferrites (Ni0.95-x Zn0.05COx Fe2O4 for x = 0.01, 0.02 and 0.03). We have recently studied their structural, morphological, magnetic properties, initial permeability, dielectric constant. They were found be with cubic ferromagnetic spinel structure, the morphology which is suitable high-density recording med...

We previously reported that platelets release a soluble factor that decreases the solute permeability of cultured bovine aortic endothelial monolayers. This factor was characterized as heat stable, trypsin sensitive, and not serotonin, adenosine, ADP, or ATP [F. R. Haselton and J. S. Alexander. Am. J. Physiol. 263 ( Lung Cell Mol. Physiol. 7): L670-L678, 1992]. We now report its identity as lys...

Several barrier epithelia such as renal collecting duct, urinary bladder, and gastric mucosa maintain high osmotic pH and solute gradients between body compartments and the blood by means of apical membranes of exceptionally low permeabilities. Although the mechanisms underlying these low permeabilities have been only poorly defined, low fluidity of the apical membrane has been postulated. The ...

Macroencapsulation technology has been an attractive topic in the field of treatment for Type 1 diabetes due to mechanical stability, versatility, and retrievability of the macro-capsule design. Macro-capsules can be categorized into extravascular and intravascular devices, in which solute transport relies either on diffusion or convection, respectively. Failure of macroencapsulation strategies...

Accurate permeability estimation has always been a concern in determining flow units, assigning appropriate capillary pressure andrelative permeability curves to reservoir rock types, geological modeling, and dynamic simulation.Acoustic method can be used as analternative and effective tool for permeability determination. In this study, a four-step approach is proposed for permeability estimati...

In normal airway epithelium, the cystic fibrosis transmembrane conductance regulator (CFTR) transports Cl(-) ions to the apical surface of the epithelium paralleled by the flow of water through transcellular and paracellular pathways. The hypothesis was tested whether CFTR not only regulates the transcellular but also the paracellular shunt pathway. Therefore, we performed measurements of trans...

Hypertonicity increases urea transport independently of, as well as synergistically with, vasopressin in the inner medullary collect duct (IMCD). We previously showed that hypertonicity does not increase the level of cAMP in the IMCD, but it does increase the level of intracellular calcium. Since we also showed that hypertonicity increases both the phosphorylation and biotinylation of the urea ...

BACKGROUND Dihydropyridines block calcium channels; however, they also influence endothelial cells, which do not express calcium channels. We tested the hypothesis that nifedipine can prevent ischemia-induced endothelial permeability increases by inhibiting protein kinase C (PKC) in cultured porcine endothelial cells. METHODS AND RESULTS Ischemia was induced by potassium cyanide/deoxyglucose,...

Change in the permeability of the mitochondrial membrane to proteins (cytochrome c and Smac) and protons is a critical step in apoptosis. Although the time from the induction of apoptosis to the change of mitochondrial permeability is variable over a period of hours, the release of proteins is an "all or none" phenomenon that is completed in an individual cell within minutes. Here, using single...