Role of metal ions in reaction catalyzed by pig heart triphosphopyridine nucleotide-dependent isocitrate dehydrogenase. III. Frequency and temperature dependence of the proton relaxation rates of solvent and substrate interaction with isocitrate dehydrogenase-bound manganese(II)

Biochemistry ◽  
1974 ◽  
Vol 13 (6) ◽  
pp. 1152-1160 ◽  
Author(s):  
Joseph J. Villafranca ◽  
Roberta F. Colman
Keyword(s):  
Metal Ions ◽  
Temperature Dependence ◽  
Isocitrate Dehydrogenase ◽  
Proton Relaxation ◽  
Relaxation Rates ◽  
Substrate Interaction

Isotope effect studies of the role of the metal ions in isocitrate dehydrogenase

Biochemistry ◽  
1977 ◽  
Vol 16 (6) ◽  
pp. 1129-1135 ◽  
Author(s):  
Marion H. O'Leary ◽  
James A. Limburg
Keyword(s):  
Metal Ions ◽  
Isotope Effect ◽  
Isocitrate Dehydrogenase

scholarly journals Conductivity and Magnetic Properties of the Charge-Transfer Complex from N,N'-Dicyanonaphthoquinonedimimine (DCNNI)and Tetrathiafulvalene (TTF)

1989 ◽  
Vol 44 (9) ◽  
pp. 825-832 ◽  
Author(s):  
H.-P. Werner ◽  
W. Grauf ◽  
J. U. von Schütz ◽  
H. C. Wolf ◽  
H. W. Helberg ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Physical Properties ◽  
Temperature Dependence ◽  
Charge Transfer Complex ◽  
Organic Conductors ◽  
Proton Relaxation ◽  
Relaxation Rates ◽  
Temperature Range ◽  
Donor And Acceptor

Abstract Conductivity (dc and ac), ESR-properties and proton relaxation rates of the charge transfer complex Tetrathiafulvalene N,N′-dicyanonaphthoquinonediimine in the temperature range be­ tween 300 K and 3.8 K are reported. This salt belongs to the unusual group of organic conductors, in which segregated donor and acceptor stacks are associated in a pairwise manner. The physical properties, which are compared with TTF-TCNQ, give evidence of non-stoichiometric charge transfer (ρ ≠ 1). A metal like state can be identified for T> 70 K, as is seen from the weak temper­ ature dependence of the conductivity (σrt ≈ 30 Scm-1) and the susceptibility (Xrt ≈ 7.5 ⋅ 10-4 emu/ mole) and from the Korringa like temperature dependence of the proton relaxation rates. The drop of the susceptibility at Tc ≈ 70 K and the activated temperature dependence of the conductivity for T < 70 K are explained by a metal-to-semiconductor transition.

Protonenspinrelaxation von Benzol an Silikageloberflächen

1968 ◽  
Vol 23 (3) ◽  
pp. 339-347
Author(s):  
D. Michel
Keyword(s):  
Temperature Dependence ◽  
Magnetic Relaxation ◽  
Spin Echo ◽  
Relaxation Times ◽  
Proton Relaxation ◽  
Relaxation Rates ◽  
Proton Proton ◽  
Proton Interaction ◽  
Paramagnetic Impurities ◽  
Hydroxyl Protons

Using spin-echo-techniques the temperature dependence of the proton magnetic relaxation times T1 and T2 of adsorbed benzene has been measured in the interval between +70 °C and —140 °C. Normal benzene C6H6 and mixtures of benzene and C6D6e were adsorbed on two sorts of silicagels which have been described elsewhere 4,9.The effective nuclear magnetic relaxation rates of adsorbed benzene are given by four contributions: the intramolecular proton-proton interaction, the interaction between benzene protons and paramagnetic impurities of the adsorbents, the interaction between benzene protons and hydroxyl protons on the silicagel surface, and the intermolecular interaction between benzene protons. These proton relaxation mechanisms depend differently on the H/D-ratio in C6H6—C6D6 mixtures (see section 4.1).The temperature dependence of the contributions 1/T1 intra and 1/T2 intra due to intramolecular proton-proton interaction suggests an anisotropic rotation of benzene molecules on the gel used. Furthermore, the existence of three different regions for the adsorbed benzene molecules has been inferred (see sections 4.2 and 5).

Adaptive Role of Lipids in Algae under Metal Ions Impact (a Review)

2018 ◽  
Vol 54 (6) ◽  
pp. 78-93
Author(s):  
V. V. Grubinko ◽  
O. I. Bodnar ◽  
A. I. Lutsiv ◽  
G. B. Viniarska
Keyword(s):  
Metal Ions ◽  
Adaptive Role
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