Results 11 to 20 of about 5,688 (181)

Photoacoustic spectroscopy of bacteriorhodopsin photocycle

Biophysical Journal, 1983
Photoacoustic spectroscopy was applied to study the energetics and the kinetics of the slow intermediates of the bacteriorhodopsin photocycle. An analysis of the modulation frequency dependence of the photoacoustic signal allowed us to estimate the ...
Delmelle, M., Renard, M., Thirion, P.
core   +3 more sources

Multiple Photocycles of Channelrhodopsin [PDF]

Biophysical Journal, 2005
Two rhodopsins with intrinsic ion conductance have been identified recently in Chlamydomonas reinhardtii. They were named "channelrhodopsins" ChR1 and ChR2. Both were expressed in Xenopus laevis oocytes, and their properties were studied qualitatively by two electrode voltage clamp techniques. ChR1 is specific for H+, whereas ChR2 conducts Na+, K+, Ca2+
Hegemann, Peter, Ehlenbeck, S., Gradmann, D.   +2 more
openaire   +3 more sources

Photocycles of Channelrhodopsin‐2 [PDF]

Photochemistry and Photobiology, 2009
AbstractRecent developments have used light‐activated channels or transporters to modulate neuronal activity. One such genetically‐encoded modulator of activity, channelrhodopsin‐2 (ChR2), depolarizes neurons in response to blue light. In this work, we first conducted electrophysiological studies of the photokinetics of hippocampal cells expressing ...
Nikolic, Konstantin, Grossman, Nir, Grubb, Matthew S., Burrone, Juan, Toumazou, Chris, Degenaar, Patrick   +5 more
openaire   +3 more sources

Catalytic Enantioselective 6π Photocyclization of Acrylanilides

Journal of the American Chemical Society, 2022
Controlling absolute stereochemistry in catalytic photochemical reactions is generally challenging owing to high rates of background reactivity. Successful strategies broadly rely on selective excitation of the reaction substrate when associated with a chiral catalyst.
Jones, BA, Solon, P, Popescu, MV, Du, J-Y, Paton, R, Smith, MD   +5 more
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Searching for a photocycle of the cryptochrome photoreceptors [PDF]

Current Opinion in Plant Biology, 2010
The initial photochemistry of plant cryptochromes has been extensively investigated in recent years. It is hypothesized that cryptochrome photoexcitation involves a Trp-triad-dependent photoreduction. According to this hypothesis, cryptochromes in the resting state contain oxidized FAD; light triggers a sequential electron transfer from three ...
Bin, Liu, Hongtao, Liu, Dongping, Zhong, Chentao, Lin   +3 more
openaire   +2 more sources

Photoisomerization detected in a fully wavelength-tunable rhodopsin mimic system. [PDF]

Acta Crystallogr D Struct Biol
The 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, Bingham C, Silva K, Nossoni Z, Gavgani HN, Nosrati M, Eaves J, Akhdar M, Vasileiou C, Borhan B, Geiger JH.   +10 more
europepmc   +2 more sources

Light-scattering changes in the bacteriorhodopsin photocycle

, 1989
Light-scattering changes were found to accompany the bacteriorhodopsin photocycle in a suspension of purple membranes. A light-scattering signal comprises three phases, connected with (i) bR → M transition, (ii) transition of M to P intermediate (other ...
Zorina, V.V., A.D. Kaulen, V.V. Zorina, Drachev, L.A., L.A. Drachev, Kaulen, A.D.   +5 more
core   +1 more source

Films based on bacteriorhodopsin in sol-gel matrices [PDF]

, 2005
The bacteriorhodopsin film in gelatin matrixes which are used as sensitive elements of integrated optic and fibre-optic sensors of various vapor and gases components will not be able to carry out the chemical control of aqueous solutions. In the given
Trikur, I. I., I. I. Trikur, Sichka, M. Y., D. H. Yang, Y. P. Sharkan, M. Y. Sichka, Yang, D. H., J. J. Ramsden, S. W. Lee, Lee, Seung-Woo, S. O. Korposh, Sharkan, Y. P., Korposh, Serhiy O., Ramsden, Jeremy J.   +13 more
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Photocyclization of styrylpyrazines.

Chemical and Pharmaceutical Bulletin, 1979
Irradiation of several 2-(β-arylvinyl) pyrazines at room temperature using a high pressure mercury lamp afforded aza-phenanthrenes in moderate yields. The ring closure of 2-[β-(3-pyridyl) vinyl] pyrazine (IIIb) occurred only at the 4-position of the pyridine ring, whereas 2-[β-(2-naphthyl) vinyl] pyrazine (IIIe) cyclized at the 1-position of the ...
OHTA, AKIHIRO, HASEGAWA, KAZUKO, AMANO, KATSUYO, MORI, CHIHARU, OHSAWA, AKIKO, IKEDA, KIYOTAKA, WATANABE, TOKUHIRO   +6 more
openaire   +2 more sources

Plasmonic Enhancement of Fluorescence and Protein Dynamics in Living Mammalian Cells

Advanced Materials, EarlyView.
This study demonstrates plasmonic enhancement of the function of fluorescent voltage sensing proteins (genetically encoded voltage indicators, (GEVIs), QuasAr6) in live mammalian cells. Coupling to plasmonic nanoparticles does not just increase fluorescence, but influences the protein photocycle, creating a hybrid sensor with its response speed to ...
Marco Locarno, Qiangrui Dong, Marco Post, Xin Meng, Cristiano Glessi, Nynke Marije Hettema, Nidas Brandsma, Sebbe Blokhuizen, Alejandro Castañeda Garcia, Srividya Ganapathy, Thieme Schmidt, Lars van Roemburg, Bing Xu, Chun‐Ting Cho, Liedewij Laan, Miao‐Ping Chien, Daan Brinks   +16 more
wiley   +1 more source