Oxygen permeability of the limiting layers of the cornea.

abstract：:We present the results of a detailed molecular dynamics study of the closed form of the P2X4 receptor. The fluctuations observed in the simulations were compared with the changes that occur in the transition from the closed to the open structure. To get further insight on the opening mechanism, the actual displacement...

journal_title：Biophysical journal

authors： Pierdominici-Sottile G,Moffatt L,Palma J

更新日期：2016-12-20 00:00:00

abstract：:An algorithm needed for computer simulation of immunodiffusion has been deduced from existing theories of the in vitro reaction between antibody and antigen. The "Goldberg most probable polymer distribution" theory provides a formula that gives the amount of free antibody, free antigen, and diffusible complexes from e...

journal_title：Biophysical journal

authors： Trautman R

更新日期：1973-05-01 00:00:00

abstract：:It is now rare to find biological, or genetic investigations that do not rely on the tools, data, and thinking drawn from the genomic sciences. Much of this revolution is powered by contemporary sequencing approaches that readily deliver large, genome-wide data sets that not only provide genetic insights but also uniq...

journal_title：Biophysical journal

authors： Schwartz DC

更新日期：2019-12-03 00:00:00

abstract：:Stepwise two-photon excitation of chlorophyll a and b in the higher plant main light-harvesting complex (LHC II) and the minor complex CP29 (as well as in organic solution) with 100-fs pulses in the Q(y) region results in a weak blue fluorescence. The dependence of the spectral shape of the blue fluorescence on excita...

journal_title：Biophysical journal

authors： Leupold D,Teuchner K,Ehlert J,Irrgang KD,Renger G,Lokstein H

更新日期：2002-03-01 00:00:00

abstract：:The TRPV1 cation nonselective ion channel plays an essential role in thermosensation and perception of other noxious stimuli. TRPV1 can be activated by low extracellular pH, high temperature, or naturally occurring pungent molecules such as allicin, capsaicin, or resiniferatoxin. Its noxious thermal sensitivity makes ...

journal_title：Biophysical journal

authors： Ladrón-de-Guevara E,Dominguez L,Rangel-Yescas GE,Fernández-Velasco DA,Torres-Larios A,Rosenbaum T,Islas LD

更新日期：2020-02-25 00:00:00

abstract：:The oligomerization of the plasma membrane calcium pump (PMCA) in phospholipid/detergent micelles was evaluated using a combined spectroscopic and kinetic approach and related to the enzyme stability. Energy transfer between fluorescein-5'-isothiocyanate and eosin-5'-isothiocyanate attached to different PMCA molecules...

journal_title：Biophysical journal

authors： Levi V,Rossi JP,Castello PR,González Flecha FL

更新日期：2002-01-01 00:00:00

abstract：:Stationary and kinetic experiments were performed on lipid bilayer membranes to study the mechanism of iodine- and bromine-mediated halide transport in detail. The stationary conductance data suggested that four different 1:1 complexes between I2 and Br2 and the halides I- and Br- were responsible for the observed con...

journal_title：Biophysical journal

authors： Klotz KH,Benz R

更新日期：1993-12-01 00:00:00

abstract：:Aromatic monocarboxylic acids are known to significantly potentiate the mechanical response of skeletal muscle fibers. In this study we investigated the effects of enantiomers of 2-(4-chlorophenoxy)propionic acid, chemically one of the simplest aromatic monocarboxylic acids with chiral properties, on mechanical thresh...

journal_title：Biophysical journal

authors： Heiny JA,Jong D,Bryant SH,Conte-Camerino D,Tortorella V

更新日期：1990-01-01 00:00:00

abstract：:Mössbauer spectra of anhydrohemoglobin establish the existence of two ferrous iron spin states in anhydrohemoglobin. Magnetic susceptibility measurements show that anhydrohemoglobin is paramagnetic and has an effective magnetic moment per iron atom of 3.5+/-0.1mu(B) at low temperatures. In conjunction with the suscept...

journal_title：Biophysical journal

authors： Grant RW,Cape JA,Gonser U,Topol LE,Saltman P

更新日期：1967-11-01 00:00:00

abstract：:The recently developed CMAP correction to the CHARMM22 force field (C22) is evaluated from 25 ns molecular dynamics simulations on hen lysozyme. Substantial deviations from experimental backbone root mean-square fluctuations and N-H NMR order parameters obtained in the C22 trajectories (especially in the loops) are el...

journal_title：Biophysical journal

authors： Buck M,Bouguet-Bonnet S,Pastor RW,MacKerell AD Jr

更新日期：2006-02-15 00:00:00

abstract：:Impact loading of articular cartilage causes extensive chondrocyte death. Cell membranes have a limited elastic range of 3-4% strain but are protected from direct stretch during physiological loading by their membrane reservoir, an intricate pattern of membrane folds. Using a finite-element model, we suggested previou...

journal_title：Biophysical journal

authors： Moo EK,Amrein M,Epstein M,Duvall M,Abu Osman NA,Pingguan-Murphy B,Herzog W

更新日期：2013-10-01 00:00:00

abstract：:The ejection of DNA from a bacterial virus (i.e., phage) into its host cell is a biologically important example of the translocation of a macromolecular chain along its length through a membrane. The simplest mechanism for this motion is diffusion, but in the case of phage ejection a significant driving force derives ...

journal_title：Biophysical journal

authors： Inamdar MM,Gelbart WM,Phillips R

更新日期：2006-07-15 00:00:00

abstract：:Human posttranslationally modified N-ras oncogenes are known to be implicated in numerous human cancers. Here, we applied a combination of experimental and computational techniques to determine structural and dynamical details of the lipid chain modifications of an N-ras heptapeptide in 1,2-dimyristoyl-sn-glycero-3-ph...

journal_title：Biophysical journal

authors： Vogel A,Tan KT,Waldmann H,Feller SE,Brown MF,Huster D

更新日期：2007-10-15 00:00:00

abstract：:Analyses of receptor-ligand interactions are important to the understanding of cellular adhesion. Traditional methods of measuring the three-dimensional (3D) dissociation constant (Kd) require at least one of the molecular species in solution and hence cannot be directly applied to the case of cell adhesion. We descri...

journal_title：Biophysical journal

authors： Piper JW,Swerlick RA,Zhu C

更新日期：1998-01-01 00:00:00

abstract：:Nef is an HIV-1 accessory protein that directly contributes to AIDS progression. Nef is myristoylated on the N-terminus, associates with membranes, and may undergo a transition from a solution conformation to a membrane-associated conformation. It has been hypothesized that conformational rearrangement enables membran...

journal_title：Biophysical journal

authors： Kent MS,Murton JK,Sasaki DY,Satija S,Akgun B,Nanda H,Curtis JE,Majewski J,Morgan CR,Engen JR

更新日期：2010-09-22 00:00:00

abstract：:Axonal beading, or the formation of a series of swellings along the axon, and retraction are commonly observed shape transformations that precede axonal atrophy in Alzheimer's disease, Parkinson's disease, and other neurodegenerative conditions. The mechanisms driving these morphological transformations are poorly und...

journal_title：Biophysical journal

authors： Datar A,Ameeramja J,Bhat A,Srivastava R,Mishra A,Bernal R,Prost J,Callan-Jones A,Pullarkat PA

更新日期：2019-09-03 00:00:00

abstract：:A detailed model for the kinetics and energetics of the exciton trapping, charge separation, charge recombination, and charge stabilization processes in photosystem (PS) II is presented. The rate constants describing these processes in open and closed reaction centers (RC) are calculated on the basis of picosecond dat...

journal_title：Biophysical journal

authors： Schatz GH,Brock H,Holzwarth AR

更新日期：1988-09-01 00:00:00

abstract：:Fluorescence recovery after photobleaching (FRAP) has been used previously to investigate the kinetics of binding to biological surfaces. The present study adapts and further develops this technique for the quantification of mass transport and reaction parameters in bulk media. The technique's ability to obtain the bu...

journal_title：Biophysical journal

authors： Kaufman EN,Jain RK

更新日期：1991-09-01 00:00:00

abstract：:Tet repressor (TetR) is involved in the most abundant mechanism of tetracycline (Tc) resistance of gram-negative bacteria. Raman spectra were measured for the class D TetR protein, for an oligodeoxyribonucleotide with sequence corresponding to operator site O1, and for the TetR:oligonucleotide complex. TetR forms a co...

journal_title：Biophysical journal

authors： Krafft C,Hinrichs W,Orth P,Saenger W,Welfle H

更新日期：1998-01-01 00:00:00

abstract：:To record post synaptic potentials or electrical activity from processes of single cells in a central nervous system (CNS) preparation in situ, voltage sensitive dyes can be injected intracellularly, thereby staining only the cell under investigation. We report the structure, evaluation, and synthesis of 11 fluorescen...

journal_title：Biophysical journal

authors： Grinvald A,Salzberg BM,Lev-Ram V,Hildesheim R

更新日期：1987-04-01 00:00:00

abstract：:Formation of the inverted hexagonal (H(II)) phase from the lamellar (L(alpha)) phase of bovine brain-extracted phosphatidylcholine (BBPC) and phosphatidylethanolamine (BBPE) was investigated using 31P-NMR with or without cholesterol. When the ratio of BBPC to BBPE was 1:1, the H(II) formation was observed in the prese...

journal_title：Biophysical journal

authors： Hayakawa E,Naganuma M,Mukasa K,Shimozawa T,Araiso T

更新日期：1998-02-01 00:00:00

abstract：:Constant electric fields and constant ion currents are often considered in theories of ion transport. Therefore, it is important to understand the validity of these helpful concepts. The constant field assumption requires that the charge density of permeant ions and flexible polar groups is virtually voltage independe...

journal_title：Biophysical journal

authors： Syganow A,von Kitzing E

更新日期：1999-02-01 00:00:00

abstract：:Supercoiled DNA polymer models for which the torsional energy depends on the total twist of molecules (Tw) are a priori well suited for thermodynamic analysis of long molecules. So far, nevertheless, the exact determination of Tw in these models has been based on a computation of the writhe of the molecules (Wr) by ex...

journal_title：Biophysical journal

authors： Lepage T,Képès F,Junier I

更新日期：2015-07-07 00:00:00

abstract：:We have investigated the phase behavior of self-assembled lyotropic liquid crystals (LC) formed by ternary mixtures of oleoylethanolamide (OEA), water and arginine. OEA, a natural analog of the endogenous cannabinoid anandamide involved in the peripheral regulation of feeding, was selected as a main component due to i...

journal_title：Biophysical journal

authors： Mohammady SZ,Pouzot M,Mezzenga R

更新日期：2009-02-18 00:00:00

abstract：:Molecular dynamics simulations of wild-type bacteriorhodopsin (bR) and of its D85N, D85T, D212N, and Y57F mutants have been carried out to investigate possible differences in the photoproducts of these proteins. For each mutant, a series of 50 molecular dynamics simulations of the photoisomerization and subsequent rel...

journal_title：Biophysical journal

authors： Humphrey W,Bamberg E,Schulten K

更新日期：1997-03-01 00:00:00

abstract：:Fluorescent labels are often used in bioassays as a means to detect and characterize ligand-receptor binding. This is due in part to the inherently high sensitivity of fluorescence-based technology and the relative accessibility of the technique. There is often little concern raised as to whether or not the fluorescen...

journal_title：Biophysical journal

authors： Swift JL,Cramb DT

更新日期：2008-07-01 00:00:00

abstract：:Photosystem II contains two well-characterized tyrosine radicals, D(.) and Z(.). Z is an electron carrier between the primary chlorophyll donor and the manganese catalytic site and is essential for enzymatic function. On the other hand, D forms a stable radical with no known role in oxygen evolution. D(.) and Z(.) giv...

journal_title：Biophysical journal

authors： Ma C,Barry BA

更新日期：1996-10-01 00:00:00

abstract：:The microsecond folding and unfolding kinetics of ovine prion proteins (ovPrP) were measured under various solution conditions. A fragment comprising residues 94-233 of the full-length ovPrP was studied for four variants with differing susceptibilities to classical scrapie in sheep. The observed biexponential unfoldin...

journal_title：Biophysical journal

authors： Chen KC,Xu M,Wedemeyer WJ,Roder H

更新日期：2011-09-07 00:00:00

abstract：:The role played by non-homogeneous interactions in stabilizing cooperative structural changes in proteins was investigated by exhaustive simulations of all compact conformations compatible with several well-defined globule-like shapes in three dimensions. Conformational free energies corresponding to the association o...

journal_title：Biophysical journal

authors： Bahar I,Jernigan RL

更新日期：1994-02-01 00:00:00

abstract：:An attempt was made to confirm previous reports of resonant-like dielectric absorption of plasmid DNA in aqueous solutions at 1-10 GHz. The dielectric properties of the sample were measured using an automatic network analyzer with two different techniques. One technique used an open-ended coaxial probe immersed in the...

journal_title：Biophysical journal

authors： Foster KR,Epstein BR,Gealt MA

更新日期：1987-09-01 00:00:00