نتایج جستجو برای: filled pore space

تعداد نتایج: 574588  

Journal: :The Journal of General Physiology 2009
Alan S.L. Yu Mary H. Cheng Susanne Angelow Dorothee Günzel Sanae A. Kanzawa Eveline E. Schneeberger Michael Fromm Rob D. Coalson

Paracellular ion transport in epithelia is mediated by pores formed by members of the claudin family. The degree of selectivity and the molecular mechanism of ion permeation through claudin pores are poorly understood. By expressing a high-conductance claudin isoform, claudin-2, in high-resistance Madin-Darby canine kidney cells under the control of an inducible promoter, we were able to quanti...

Journal: :Journal of the American Chemical Society 2005
Xinyu Zhang Sanjeev K Manohar

Bulk quantities of electrically conducting nanotubes of polypyrrole having narrow pore diameter (6 nm) can be synthesized rapidly by chemical oxidative polymerization of pyrrole in the presence of stoichiometric amounts of V2O5 nanofibers. The V2O5 nanofibers act as templates for polymerization and yield, as the initial product, polypyrrole nanotubes with pores filled with V2O5. The V2O5 dissol...

2016
Judy Lieberman

Killer lymphocytes provide powerful immune protection from cancer and infection by eliminating dangerous cells. Innate killer cells (principally natural killer cells) and innate-like T cells provide the first response. Antigen-specific immunity by cytotoxic T lymphocytes takes over about a week later and provides life-long immunity. When killer cells recognize a target cell, they mobilize cytot...

Journal: :Magnetic resonance in medicine 2013
Anja Penk Yvonne Förster Holger A Scheidt Ariane Nimptsch Michael C Hacker Michaela Schulz-Siegmund Peter Ahnert Jürgen Schiller Stefan Rammelt Daniel Huster

PURPOSE The influence of the pore size of biodegradable poly(lactic-co-glycolic acid) scaffolds on bone regeneration was investigated. METHODS Cylindrical poly(lactic-co-glycolic acid) scaffolds were implanted into a defect in the tibial head of rats. Pore sizes of 100-300, 300-500, and 500-710 μm were tested and compared to untreated defects as control. Two and four weeks after implantation,...

2007
I. David Abrahams Gregory A. Kriegsmann

We employ a homogenization procedure to describe the propagation of electromagnetic waves in a dielectric structure which is doubly-periodic in the X-Y plane and of arbitrary variation in the direction of propagation, Z. The fundamental cell is composed of an arbitrarily shaped pore filled with a dielectric and the host by another. Our analysis yields the structure of the electromagnetic fields...

Journal: :The Journal of General Physiology 2004
Anna Boccaccio Franco Conti Baldomero M. Olivera Heinrich Terlau

The x-ray structure of the KcsA channel at different [K(+)] and [Rb(+)] provided insight into how K(+) channels might achieve high selectivity and high K(+) transit rates and showed marked differences between the occupancies of the two ions within the ion channel pore. In this study, the binding of kappa-conotoxin PVIIA (kappa-PVIIA) to Shaker K(+) channel in the presence of K(+) and Rb(+) was ...

Journal: :Journal of nematology 2000
S Y Chen J Charnecki J F Preston D W Dickson

Pasteuria penetrans is an endospore-forming bacterial parasite of root-knot nematodes that has potential as a biological control agent. Biochemical investigations of P. penetrans are limited because of difficulty in obtaining large quantities of endospores free of plant debris and contaminating microorganisms. Our objective was to develop a technique for extraction and purification of P. penetr...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
S Vaitheeswaran D Thirumalai

Confinement effects on protein stability are relevant in a number of biological applications ranging from encapsulation in the cylindrical cavity of a chaperonin, translocation through pores, and structure formation in the exit tunnel of the ribosome. Consequently, free energies of interaction between amino acid side chains in restricted spaces can provide insights into factors that control pro...

Journal: :Journal of the American Chemical Society 2008
Junhua Luo Hongwu Xu Yun Liu Yusheng Zhao Luke L Daemen Craig Brown Tatiana V Timofeeva Shengqian Ma Hong-Cai Zhou

A highly stable porous lanthanide metal-organic framework, Y(BTC)(H2O).4.3H2O (BTC = 1,3,5-benzenetricarboxylate), with pore size of 5.8 A has been constructed and investigated for hydrogen storage. Gas sorption measurements show that this porous MOF exhibits highly selective sorption behaviors of hydrogen over nitrogen gas molecules and can take up hydrogen of about 2.1 wt % at 77 K and 10 bar...

Journal: :Biochimica et biophysica acta 1981
R Benz R E Hancock

The incorporation of porin protein F from the outer membrane of Pseudomonas aeruginosa into artificial lipid bilayers results in an increase of the membrane conductance by many orders of magnitude. The membrane conductance is caused by the formation of large ion-permeable channels with a single-channel conductance in the order of 5 nS for 1 M alkali chlorides. The conductance has an ohmic curre...

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