Expansion Of Membranes
Mostrando 13-24 de 60 artigos, teses e dissertações.
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13. Renormalization of the tension and area expansion modulus in fluid membranes.
Renormalization of the membrane tension and elastic area expansion modulus by thermally induced bending fluctuations is treated in terms of the formalism of Brochard, De Gennes, and Pfeuty (J. de Phys. (France). 37:1099-1104, 1976). The dependence of the renormalized tension on the bare membrane tension parallels the dependence on the fractional area extensi
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14. Volume and enthalpy changes after photoexcitation of bovine rhodopsin: laser-induced optoacoustic studies.
Laser-induced optoacoustic measurements were performed with bovine rhodopsin in the temperature range 5-32 degrees C in its natural environment (i.e., in washed membranes) as well as solubilized in dodecyl-beta-D-maltoside. A signal deconvolution procedure using a simple sequential kinetic scheme for the photobaric time evolution revealed, in the case of the
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15. Interaction of the influenza hemagglutinin fusion peptide with lipid bilayers: area expansion and permeation.
Fusion is a crucial event in the infection of animal cells by enveloped viruses (e.g., HIV or influenza). Viral fusion is mediated by glycoproteins, spanning the viral envelope, which attach to a membrane surface and induce fusion of the viral envelope to the cellular membrane. Influenza fusion protein (hemagglutinin) contains an amino-terminal segment criti
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16. Membrane mechanics can account for fusion pore dilation in stages.
Once formed, fusion pores rapidly enlarge to semi-stable conductance values. The membranes lining the fusion pore are continuous bilayer structures, so variations of conductance in time reflect bending and stretching of membranes. We therefore modeled the evolution of fusion pores using the theory of the mechanics of deforming homogeneous membranes. We calcu
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17. Anesthetics and high-pressure interaction upon elastic properties of a polymer membrane.
Anesthetics expand cell membranes, and high pressures (about 10-15 MPa) antagonize the anesthetic action. It is also known that inhalation anesthetics expand elastomer membranes. The mechanism of pressure antagonism of anesthetic action on membrane expansion was investigated in the present study with Silastic membranes. Halothane increased the length of Sila
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18. Generation of Cubic Membranes by Controlled Homotypic Interaction of Membrane Proteins in the Endoplasmic Reticulum*S⃞
Cell membranes predominantly consist of lamellar lipid bilayers. When studied in vitro, however, many membrane lipids can exhibit non-lamellar morphologies, often with cubic symmetries. An open issue is how lipid polymorphisms influence organelle and cell shape. Here, we used controlled dimerization of artificial membrane proteins in mammalian tissue cu
American Society for Biochemistry and Molecular Biology.
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19. Effect of changing the size of lipid headgroup on peptide insertion into membranes.
Adsorption of amphiphilic peptides to the headgroup region of a lipid bilayer is a common mode of protein-membrane interactions. Previous studies have shown that adsorption causes membrane thinning. The degree of the thinning depends on the degree of the lateral expansion caused by the peptide adsorption. If this simple molecular mechanism is correct, the de
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20. SPO21 Is Required for Meiosis-specific Modification of the Spindle Pole Body in Yeast
During meiosis II in the yeast Saccharomyces cerevisiae, the cytoplasmic face of the spindle pole body changes from a site of microtubule initiation to a site of de novo membrane formation. These membranes are required to package the haploid meiotic products into spores. This functional change in the spindle pole body involves the expansion and modifica
The American Society for Cell Biology.
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21. Surface shape change during fusion of erythrocyte membranes is sensitive to membrane skeleton agents.
We previously reported that the induction of membrane fusion between pairs of erythrocyte ghosts is accompanied by the formation of a multipore fusion zone that undergoes an area expansion with condition-dependent characteristics. These characteristics allowed us to hypothesize substantial, if not major, involvement of the spectrin-based membrane skeleton in
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22. Effects of the membrane action of tetralin on the functional and structural properties of artificial and bacterial membranes.
Tetralin is toxic to bacterial cells at concentrations below 100 mumol/liter. To assess the inhibitory action of tetralin on bacterial membranes, a membrane model system, consisting of proteoliposomes in which beef heart cytochrome c oxidase was reconstituted as the proton motive force-generating mechanism, and several gram-positive and gram-negative bacteri
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23. The late chlamydial inclusion membrane is not derived from the endocytic pathway and is relatively deficient in host proteins.
Chlamydiae are obligate intracellular parasites which multiply within infected cells in a membrane-bound structure termed an inclusion. Newly internalized bacteria are surrounded by host plasma membrane; however, the source of membrane for the expansion of the inclusion is unknown. To determine if the membrane for the mature inclusion was derived by fusion w
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24. The Phenolic Hydroxyl Group of Carvacrol Is Essential for Action against the Food-Borne Pathogen Bacillus cereus
The natural antimicrobial compound carvacrol shows a high preference for hydrophobic phases. The partition coefficients of carvacrol in both octanol-water and liposome-buffer phases were determined (3.64 and 3.26, respectively). Addition of carvacrol to a liposomal suspension resulted in an expansion of the liposomal membrane. Maximum expansion was observed
American Society for Microbiology.