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Titolo:
Decay of dipolar order in diamagnetic and paramagnetic proteins and protein gels
Autore:
Danek, AN; Bryant, RG;
Indirizzi:
Univ Virginia, Dept Chem, Charlottesville, VA 22901 USA Univ Virginia Charlottesville VA USA 22901 Charlottesville, VA 22901 USA
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 1, volume: 143, anno: 2000,
pagine: 35 - 38
SICI:
1090-7807(200003)143:1<35:DODOID>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
HETEROGENEOUS SPIN SYSTEMS; MAGNETIZATION-TRANSFER; LONGITUDINAL MAGNETIZATION; SELECTIVE SATURATION; PROTON RELAXATION; CROSS-RELAXATION; TRANSIENT DECAY; RESONANCE; POLYMERS;
Keywords:
T-1D; dipolar relaxation; MTC; magnetization transfer; Z spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Danek, AN Univ Virginia, Dept Chem, Mccormick Rd, Charlottesville, VA 22901 USA Univ Virginia Mccormick Rd Charlottesville VA USA 22901 2901 USA
Citazione:
A.N. Danek e R.G. Bryant, "Decay of dipolar order in diamagnetic and paramagnetic proteins and protein gels", J MAGN RES, 143(1), 2000, pp. 35-38

Abstract

Magnetic relaxation in solids may be complicated by the creation and loss of dipolar order at finite rates. In tissues the molecular and spin dynamics may be significantly different because of the relatively high concentration of water. We have applied a modified Jeneer-Broekaert pulse sequence to measure dipolar relaxation rates in both dry and hydrated protein systems that may serve as magnetic models for tissue. In lyophilized and dry serum albumin, the dipolar relaxation time, T-1D is on the order of 1 ms and is consistent with earlier reports. When hydrated by deuterium oxide, the dipolar relaxation times measured were on the order of tens of microseconds. Whenparamagnetic centers are included in the protein, the Jeneer-Broekaert echo decay times became the order of the decay time for transverse magnetization, i.e., the order of 10 mu s or less. In the hydrated or paramagnetic systems, the dipolar relaxation times are too short to require inclusion in the quantitative analysis of magnetization transfer experiments. (C) 2000 Academic Press.

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Documento generato il 02/07/20 alle ore 21:39:15