نتایج جستجو برای: ion transfer

تعداد نتایج: 488330  

Journal: :Journal of Mathematical Chemistry 2022

Abstract Two-electron transfer by fast heavy nuclei from heliumlike targets is studied. A detailed sequence of comprehensive computations carried out in a large keV–MeV range the projectile energies. This set illustrated with total cross sections for double capture alpha particles helium atoms using several frequently applied four-body quantum-mechanical distorted wave models correct boundary c...

Journal: :Biophysical journal 2008
Ben Corry Dylan Jayatilaka

Measurements of time-resolved fluorescence anisotropy and fluorescence resonance energy transfer are finding many applications in the study of biological macromolecules as they enable structural properties of the host molecules to be determined in their natural environment. A difficulty in interpreting these experiments is that they both require knowledge of the relative orientation of the fluo...

Journal: :Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology 2008
Simona Rodighiero Claudia Bazzini Markus Ritter Johannes Fürst Guido Botta Giuliano Meyer Markus Paulmichl

Fluorescence resonance energy transfer (FRET) is a technique used for the study of functional interactions between molecules. The intimate vicinity between two fluorescent molecules (FRET-pair; donor and acceptor) allows for an energy transfer, which can be directly calculated as the so called FRET efficiency. This technique is used in fixed as well as living cells. Here we show first, measured...

2017
Jialong Jie Kunhui Liu Lidan Wu Hongmei Zhao Di Song Hongmei Su

Although the radical ion pair has been frequently invoked as a key intermediate in DNA oxidative damage reactions and photoinduced electron transfer processes, the unambiguous detection and characterization of this species remain formidable and unresolved due to its extremely unstable nature and low concentration. We use the strategy that, at cryogenic temperatures, the transient species could ...

2005
Gary B. Schuster

Cyanine borate (R(Ph)3B-; R alkyl) salts dissolved in non-polar solvents exist predominantly as ion pairs. Irradiation of the ion pair with visible light absorbed by the cyanine leads to formation of a locally excited singlet state of the dye. The singlet excited cyanine in the ion pair is capable of oxidizing the borate anion to the boranyl radical (R(Ph)3B.) The rate constant for this electro...

Journal: :The journal of physical chemistry. A 2011
Sean T Roberts Krupa Ramasesha Poul B Petersen Aritra Mandal Andrei Tokmakoff

While it is generally recognized that the hydroxide ion can rapidly diffuse through aqueous solution due to its ability to accept a proton from a neighboring water molecule, a description of the OH(-) solvation structure and mechanism of proton transfer to the ion remains controversial. In this report, we present the results of femtosecond infrared spectroscopy measurements of the O-H stretchin...

2017
Yusuke Tsuruwaka Eriko Shimada Kenta Tsutsui Tomohisa Ogawa

Intracellular calcium ion (Ca2+) signaling is heavily involved in development, as illustrated by the use of a number of Ca2+ indicators. However, continuous Ca2+ patterns during morphogenesis have not yet been studied using fluorescence resonance energy transfer to track the Ca2+ sensor. In the present study, we monitored Ca2+ levels during zebrafish morphogenesis and differentiation with yello...

Journal: :Biophysical journal 2005
Ben Corry Paul Rigby Zhen-Wei Liu Boris Martinac

We demonstrate that fluorescence resonance energy transfer spectroscopy is a powerful tool for in situ structural analysis of multimeric membrane proteins by measuring the conformational changes involved in gating the mechanosensitive ion channel of large conductance. Ensemble analysis is used to analyze the intensity of light emitted by AlexaFluor-labeled cysteine mutants reconstituted into ar...

Journal: :Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 1992

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