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2006 | 109 | 3 | 389-398
Article title

The Effect of Water Accessible Paramagnetic Ions on Subcellular Structures Formed in Developing Wheat Photosynthetic Membranes as Observed by NMR and by Sorption Isotherm

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EN
Abstracts
EN
The rehydration from the gaseous phase of the developing native or EDTA-washed from unbound and loosely bound paramagnetic ions wheat thylakoid membrane lyophilizate was investigated using hydration kinetics, sorption isotherm, and high power proton relaxometry. Hydration time courses are single exponential for all target humidities. The sorption isotherm is well fitted by the Dent model, with the mass of water saturating primary binding sites equal toΔ M/m_ 0=0.024 and 0.017 for native and EDTA-washed membranes, respectively. Proton free induction decays distinguish: (i) a Gaussian component, S_0, coming from protons of solid matrix of lyophilizate; (ii) a Gaussian component, S_1, from water bound to the primary water binding sites in proximity of water accessible paramagnetic ions; (iii) an exponentially decaying contribution, $L_1$, from water tightly bound to lyophilizate surface; and (iv) exponentially decaying loosely bound water pool, L_2. Sorption isotherm fitted to NMR data shows a significant contribution of water "sealed" in membrane structures (Δ M_s/m_0=0.052 for native and 0.061 for EDTA-washed developing membranes, respectively).
Keywords
EN
Publisher

Year
Volume
109
Issue
3
Pages
389-398
Physical description
Dates
published
2006-03
received
2005-05-20
Contributors
author
  • Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
author
  • Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
author
  • Faculty of Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv109n321kz
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