Results 11 to 20 of about 17,342 (214)
Meniscus-Mediated Imaging of Soft Biological Membranes Using 200 kN/m Ultra-Stiff 15 MHz MEMS AFM Probes. [PDF]
J Mol RecognitABSTRACT Coronaviruses, among other membrane‐enveloped viruses, can remain infectious on surfaces in ambient air for days. Many bacteria and fungi also expose their plasma membranes to air environments. Key survival strategies in air include hydrophobic coatings to prevent water loss and waxy or silica‐based resistant cell walls.
Subramanian S +3 more
europepmc +2 more sources
Photoisomerization detected in a fully wavelength-tunable rhodopsin mimic system. [PDF]
Acta Crystallogr D Struct BiolThe mechanism of retinal photoswitching is illuminated in a designed rhodopsin mimic. Two mechanisms, a conventional cis–trans isomerization and an unprecedented `photodehydration', are observed at atomic resolution in single crystals.We describe the photoisomerization of the retinylidene protonated Schiff base in human retinol‐binding protein II ...
Ehyaei N +10 more
europepmc +2 more sources
Damage-limited resolution for X-ray and electron microscopy of organic specimens. [PDF]
Acta Crystallogr D Struct BiolAnalytical expressions for the damage‐limited resolution are developed and applied to X‐ray and electron imaging of beam‐sensitive specimens. The findings will guide future microscopy and instrument design.Analytical expressions for the damage‐limited resolution (DLR) are developed and applied to X‐ray and electron imaging of beam‐sensitive specimens ...
Egerton RF, Nave C.
europepmc +2 more sources
Collective exchange processes reveal an active site proton cage in bacteriorhodopsin [PDF]
, 2020 Proton translocation across membranes is vital to all kingdoms of life. Mechanistically, it relies on characteristic proton flows and modifications of hydrogen bonding patterns, termed protonation dynamics, which can be directly observed by fast magic ...
Brünig, Florian N. +5 more
core +1 more source
Energy transfer from retinal to amino acids — a time-resolved study of the ultraviolet emission of bacteriorhodopsin [PDF]
, 1986 Two-step excitation of retinal in bacteriorhodopsin by visible light is followed by an energy transfer to amino acids that is seen as fluorescent emission around 350 nm.
Franz, M. A. +4 more
core +1 more source
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
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 +3 more
doaj +1 more source
A Light-Driven Integrated Bio-Capacitor with Single Nano-Channel Modulation
Nanomaterials, 2022 Bioelectronics, an emerging discipline formed by the biology and electronic information disciplines, has maintained a state of rapid development since its birth.
Jie Lin +6 more
doaj +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 +5 more
doaj +1 more source
Probing a polar cluster in the retinal binding pocket of bacteriorhodopsin by a chemical design approach. [PDF]
PLoS ONE, 2012 Bacteriorhodopsin has a polar cluster of amino acids surrounding the retinal molecule, which is responsible for light harvesting to fuel proton pumping.
Rosana Simón-Vázquez +7 more
doaj +1 more source