Water traverses the plasma membranes of some eukaryotic cells faster than can be explained by the water permeability of their lipid bilayers. This has led to a search for a water channel. Our previous work identified glucose transporters as candidates for such a channel. We report here that Xenopus laevis oocytes injected with mRNA encoding the brain/Hep G2, adult skeletal muscle/adipocyte, or ...

In this paper, the effect of flow rate on relative permeability curves was investigated in Iranian carbonate rocks. Core samples were prepared from outcrop of Asmari formation. The dynamic displacement experiments were performed at 2.55, 3.55, 4.55 and 5.55 cc/hr during waterflooding and oilflooding. Relative permeabilities have been calculated with the Jones and Roszelle method and then the fl...

Edible films were made from proteins (corn-zein and wheat gluten) and celluloses (methyl cellulose and hydroxypropyl cellulose), and tested fog permeability of gases. Oxygen and carbon dioxide permeabilities of edible films were generally lower than those of plastic films. However, water vapor permeabilities of edible films were higher than those of plastic films. The concentration of plasticiz...

Elasmobranchs such as the dogfish shark Squalus acanthius achieve osmotic homeostasis by maintaining urea concentrations in the 300- to 400-mM range, thus offsetting to some degree ambient marine osmolalities of 900-1,000 mosmol/kgH(2)O. These creatures also maintain salt balance without losing urea by secreting a NaCl-rich (500 mM) and urea-poor (18 mM) fluid from the rectal gland that is isot...

Sysyn, Gregory D., Katherine H. Petersson, Clifford S. Patlak, Grazyna B. Sadowska, and Barbara S. Stonestreet. Effects of postnatal dexamethasone on bloodbrain barrier permeability and brain water content in newborn lambs. Am J Physiol Regulatory Integrative Comp Physiol 280: R547–R553, 2001.—We showed that antenatal corticosteroids reduced blood-brain barrier permeability in fetuses at 60 and...

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...

it was difficult to obtain directly in a single experiment films of exactly 0.1-mm. thickness, several films were selected so that the thickness of each film might be distributed in a range from 0.05 to 0.4 mm. and the respective water vapor permeability was measured at various humidity conditions. Plotting the relationship between permeation resistance (l/Q) and film thickness (I) gave a strai...

This paper shows that the theory describing gas diffusion with no consideration of total pressure leads to an underestimation water vapor diffusive permeability. experimental method, called cup can be considered as one most popular tests in domain heat and mass transfer for building applications. Thus, it is likely permeability defined current materials underestimated. Thanks approach proposed ...

BACKGROUND AND OBJECTIVES Smear layer removal with EDTA from root canal walls allows greater cleaning and disinfection of root canals. However, because Er:YAG laser acts on the removal of the smear layer, the objective of investigation was to analyze in vitro the effect of Er:YAG laser on dentin root canal wall permeability after endodontic instrumentation and irrigation with water or sodium hy...