Based on porosity and permeability tests, high-pressure mercury injection (HPMI), nuclear magnetic resonance (NMR) centrifugal experiments, this study comprehensively analyzed the quality, pore structure fractal characteristics of tight sandstone reservoir in meandering stream facies. The purpose is to reveal relationship between physical properties, geometry topological parameters pores, fluid...

channel pores where no very long jumps are possible. For pores with an elevation that varies like a random walk (red) and alternating pores (blue) the scaled mean square displacement /t is asymp-totically constant. 1. Introduction In general, diffusion of gas particles depends on the collisions between the gas molecules as well as on the collisions of the gas with the pore walls. Of pa...

The fuel cells are distinguished as generating of green allocable energy and are electrochemical devices of low environmental impact. Porous nanocrystalline strontium-doped lanthanum manganite La0.8Sr0.2MnO3 (LSM) cathode materials were prepared by mechanochemical route in various grinding times. Carbon black was employed to produce pores. The formation of LSM single phase was studied by X-ray ...

Jones et al., 2021Jones R. Bragagnolo G. Arranz Reguera J. Capping pores of alphavirus nsP1 gate membranous viral replication factories.Nature. 2021; 589: 615-619Crossref PubMed Scopus (18) Google Scholar and Zhang 2021Zhang K. Law Y.-S. M.C.Y. Tan Y.B. Wirawan M. Luo D. Structural insights into the RNA capping plasma membrane targeting by Chikungunya virus nonstructural protein 1.Cell Host Mic...

Glutamate receptors are ligand-gated ion channels that mediate fast excitatory synaptic transmission throughout the central nervous system. Functional receptors are homo- or heteromeric tetramers with each subunit contributing a re-entrant pore loop that dips into the membrane from the cytoplasmic side. The pore loops form a narrow constriction near their apex with a wide vestibule toward the c...

JCB • VOLUME 167 • NUMBER 6 • 2004 994 Opening closed pores closed mitosis may be less closed than was thought, based on results from Colin De Souza, Stephen Osmani, and colleagues (The Ohio State University, Columbus, OH). The authors find that a fungus opens nuclear pores during mitosis to permit diffusion into and out of the nucleus. Simple organisms may thus be viable model systems for the ...

Address correspondence to Shoichiro Tsukita, M.D., Ph.D., Department of Cell Biology, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. Tel.: 81-75-753-4372. Fax: 81-75-753-4660. E-mail:htsukita @mfour.med.kyoto-u.ac.jp 1 Abbreviations used in this paper: CPE, Clostridium perfringens enterotoxin; TJ, tight junction. In vertebrates, tight junctions (TJs) 1 play a central ro...