ArticleBiophysical journal2005
Dielectric and calorimetric studies of hydrated purple membrane.
Article in Biophysical journal, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Gold nanochannels oxidation by confined water.RSC advances · 2020Article
- Switch from conventional to distributed kinetics in the bacteriorhodopsin photocycle.Biochemistry · 2008Article
- Dynamics of hydration water in deuterated purple membranes explored by neutron scattering.European biophysics journal : EBJ · 2008Article
- Coupling of protein and hydration-water dynamics in biological membranes.Proceedings of the National Academy of Sciences of the United States of America · 2007Article
- Liquid-like water confined in stacks of biological membranes at 200 k and its relation to protein dynamics.Biophysical journal · 2005Article
- Infrared monitoring of interlayer water in stacks of purple membranes.Photochemistry and photobiologyArticle
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Purple membranes (PM) from halobacteria were hydrated to approximately 0.4 and approximately 0.2 g H(2)O/g of PM and studied by dielectric spectroscopy and differential scanning calorimetry between 120 and 300 K. The dielectric process, attributed to a local (beta) relaxation of the confined supercooled water, shows an Arrhenius temperature behavior at low temperatures. In the case of the most hydrated PM a small deviation from the Arrhenius behavior occurs at 190-200 K together with a pronounced endothermic process and an increased activation energy. The observed crossover is accompanied by a reduction of the interlayer spacing due to the partial loss of the intermembrane water. All these effects at approximately 200 K are consistent with a scenario where the local relaxation process merges with a nonobservable alpha-relaxation of the interlayer water, giving rise to a more liquid-like behavior of the interfacial water. For the less hydrated sample the effects are less pronounced and shift to a slightly higher temperature.
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