scholarly journals Quantum-classical transition of the escape rate of uniaxial antiferromagnetic particles in an arbitrarily directed field

2003 ◽  
Vol 68 (21) ◽  
Author(s):  
Bin Zhou ◽  
Ruibao Tao ◽  
Shun-Qing Shen
Keyword(s):  
Escape Rate ◽  
Classical Transition

scholarly journals Quantum-classical transition of the escape rate of a uniaxial spin system in an arbitrarily directed field

1998 ◽  
Vol 57 (21) ◽  
pp. 13639-13654 ◽  
Author(s):  
D. A. Garanin ◽  
X. Martínez Hidalgo ◽  
E. M. Chudnovsky
Keyword(s):  
Spin System ◽  
Escape Rate ◽  
Classical Transition

Increased transcapillary escape rate of albumin in nondiabetic men in response to hyperinsulinemia

Diabetes ◽  
1990 ◽  
Vol 39 (10) ◽  
pp. 1212-1217 ◽  
Author(s):  
J. E. Nestler ◽  
C. O. Barlascini ◽  
G. A. Tetrault ◽  
M. J. Fratkin ◽  
J. N. Clore ◽  
...  
Keyword(s):  
Escape Rate ◽  
Transcapillary Escape Rate

scholarly journals Myocardial extraction and retention of 2-iododesmethylimipramine: a novel flow marker

1986 ◽  
Vol 250 (6) ◽  
pp. H1060-H1070 ◽  
Author(s):  
S. E. Little ◽  
J. M. Link ◽  
K. A. Krohn ◽  
J. B. Bassingthwaighte
Keyword(s):  
Escape Rate ◽  
Flow Imaging ◽  
Rapid Loss ◽  
Ideal Flow ◽  
Regional Flow ◽  
Myocardial Flow

An ideal deposition marker for measuring regional flow is completely extracted during transcapillary passage and permanently retained. beta-Labeled desmethylimipramine ([3H]DMI) is a nearly ideal flow marker. To obtain gamma- and positron-emitting markers, DMI was iodinated to form 2-iododesmethylimipramine (IDMI). IDMI was more lipophilic than DMI. In isolated saline-perfused rabbit hearts its transorgan extraction was greater than 99%; and retention was greater than 98% at 5 min at mean flows of up to 3.5 ml X g-1 X min-1. During washout, the fractional escape rate was less than 0.1% X min-1 and was independent of flow. In isolated blood-perfused rabbit hearts, extraction was still 98%, but retention was as low as 86% after 5 min at a flow of 1.6 ml X g-1 X min-1. The fractional escape rate was up to 2% X min-1 but independent of flow. Despite this relatively rapid loss, regional IDMI deposition remains proportional to regional flow for many minutes. Therefore IDMI is useful as an externally detectable "molecular microsphere" for myocardial flow imaging in vivo.

On the Calculation of Transition State Activity Coefficient and Solvent Effects on Chemical Reactions

1998 ◽  
Vol 63 (12) ◽  
pp. 1969-1976 ◽  
Author(s):  
Alvaro Domínguez ◽  
Rafael Jimenez ◽  
Pilar López-Cornejo ◽  
Pilar Pérez ◽  
Francisco Sánchez
Keyword(s):  
Activity Coefficient ◽  
Transition State ◽  
Chemical Reactions ◽  
Solvent Effects ◽  
Transition State Theory ◽  
Reaction Medium ◽  
State Theory ◽  
Precursor Complex ◽  
State Activity ◽  
Classical Transition

Solvent effects, when the classical transition state theory (TST) holds, can be interpreted following the Brønsted equation. However, when calculating the activity coefficient of the transition state, γ# it is important to take into account that this coefficient is different from that of the precursor complex, γPC. The activity coefficient of the latter is, in fact, that calculated in classical treatments of salt and solvent effects. In this paper it is shown how the quotients γ#/γPC change when the reaction medium changes. Therefore, the conclusions taken on the basis of classical treatments may be erroneous.

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