Results 21 to 30 of about 29,478 (285)

Spontaneous and Electrically Induced Anisotropy of Composite Agarose Gels

Gels, 2022
Agarose gels containing and not bacteriorhodopsin purple membranes (incorporated before gelling) manifest spontaneous optical anisotropy. The dependencies of the anisotropy on the agarose concentration and time have been studied.
Alexandar M. Zhivkov, Svetlana H. Hristova   +1 more
doaj   +1 more source

Enhanced Resolution in EPR Spectroscopy Using para-Hydrogen Matrices. [PDF]

Angew Chem Int Ed Engl
We demonstrate the advantageous properties of solid para‐hydrogen (p‐H2) matrices for electron paramagnetic resonance (EPR) spectroscopy by investigating the 2,2,6,6‐tetramethylpiperidinyloxyl (TEMPO) radical and an in situ generated P‐centered mono‐radical.
Portela-González A, Sander W, Eckhardt AK.   +2 more
europepmc   +2 more sources

Bacteriorhodopsin

Annual Review of Physiology, 1999
▪ Abstract  Fourier transform infrared and Raman spectroscopy, solid-state NMR, and X-ray crystallography have contributed detailed information about the structural changes in the proton transport cycle of the light-driven pump, bacteriorhodopsin. The results over the past few years add up to a step-by-step description of the configurational changes ...
J K, Lanyi, H, Luecke
openaire   +5 more sources

Real-time UV-visible spectroscopy analysis of purple membrane-polyacrylamide film formation taking into account Fano line shapes and scattering.

PLoS ONE, 2014
We theoretically and experimentally analyze the formation of thick Purple Membrane (PM) polyacrylamide (PA) films by means of optical spectroscopy by considering the absorption of bacteriorhodopsin and scattering.
María Gomariz, Salvador Blaya, Pablo Acebal, Luis Carretero   +3 more
doaj   +1 more source

Without Contact Resistance, Proteins in Thin-Film Solid-State Junctions Can Be Efficient Electronic Conducting Materials. [PDF]

Adv Mater
It is demonstrated that contact resistance is effectively eliminated in two‐probe micropore device metal/protein/metal bioelectronic junctions. These results, using two different protein types in these junctions, show that, as ultrathin (<40 nm) films, proteins are an even more efficient electronic transport medium than previously thought, when the ...
Bera S, Vilan A, Das S, Pecht I, Ehre D, Sheves M, Cahen D.   +6 more
europepmc   +2 more sources

Femtosecond spectroscopy of the first events of the photochemical cycle in bacteriorhodopsin [PDF]

, 1985
The first steps in the photochemistry of bacteriorhodopsin (BR) are investigated with light pulses of 160 fs duration. Four samples are studied: (i) the purple membrane, (ii) deuterated purple membrane, (iii) BR trimers and (iv) BR monomers.
Kaiser, Wolfgang, Koelling, E., Nuss, M. C., Oesterhelt, Dieter, Zinth, Wolfgang   +4 more
core   +1 more source

Retinal isomerization in bacteriorhodopsin captured by a femtosecond x-ray laser

Science, 2018
Look fast Organisms from bacteria to humans sense and react to light. Proteins that contain the light-sensitive molecule retinal couple absorption of light to conformational changes that produce a signal or move ions across a membrane. Nogly et al.
P. Nogly, T. Weinert, D. James, S. Carbajo, D. Ozerov, A. Furrer, D. Gashi, V. Borin, P. Skopintsev, K. Jaeger, K. Nass, P. Båth, R. Bosman, J. Koglin, M. Seaberg, T. Lane, D. Kekilli, Steffen Brünle, Tomoyuki Tanaka, Wenting Wu, C. Milne, T. White, A. Barty, U. Weierstall, V. Panneels, E. Nango, S. Iwata, M. Hunter, I. Schapiro, G. Schertler, R. Neutze, J. Standfuss   +31 more
semanticscholar   +1 more source

Evolution of rhodopsin ion pumps in haloarchaea

BMC Evolutionary Biology, 2007
Background The type 1 (microbial) rhodopsins are a diverse group of photochemically reactive proteins that display a broad yet patchy distribution among the three domains of life.
Ford Doolittle W, Rodriguez-Valera Francisco, Bapteste Eric, Walsh David A, Sharma Adrian K, Papke R Thane   +5 more
doaj   +1 more source

Proton uptake mechanism in bacteriorhodopsin captured by serial synchrotron crystallography

Science, 2019
Refilling the proton pump Proteins are dynamic. Rearrangements of side chains, secondary structure, and entire domains gate functional transitions on time scales ranging from picoseconds to milliseconds. Weinert et al.
T. Weinert, P. Skopintsev, D. James, F. Dworkowski, E. Panepucci, D. Kekilli, A. Furrer, Steffen Brünle, S. Mous, D. Ozerov, P. Nogly, Meitian Wang, J. Standfuss   +12 more
semanticscholar   +1 more source

Nonlinear Optical Investigation of Microbial Chromoproteins

Frontiers in Plant Science, 2020
Membrane-bound or cytosolic light-sensitive proteins, playing a crucial role in energy- and signal-transduction processes of various photosynthetic microorganisms, have been optimized for sensing or harvesting light by myriads of years of evolution. Upon
Szilvia Krekic, Szilvia Krekic, Tomás Zakar, Zoltán Gombos, Sándor Valkai, Mark Mero, László Zimányi, Zsuzsanna Heiner, András Dér   +8 more
doaj   +1 more source