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Dielectric and calo...
Dielectric and calorimetric studies of hydrated purple membrane
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- Berntsen, Peter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bergman, Rikard, 1966 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Jansson, Helen, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Weik, M. (författare)
- Institut de Biologie Structurale Jean-Pierre Ebel
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- Swenson, Jan, 1966 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2005
- 2005
- Engelska.
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Ingår i: Biophysical Journal. - : Elsevier BV. - 0006-3495 .- 1542-0086. ; 89:5, s. 3111-3128
- Relaterad länk:
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http://www.cell.com/...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Purple membranes (PM) from halobacteria were hydrated to ∼0.4 and ∼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 (β) 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 ∼200 K are consistent with a scenario where the local relaxation process merges with a nonobservable α-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. © 2005 by the Biophysical Society.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
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- art (ämneskategori)
- ref (ämneskategori)
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