scholarly journals Site-site memory equation approach in study of density/pressure dependence of translational diffusion coefficient and rotational relaxation time of polar molecular solutions: Acetonitrile in water, methanol in water, and methanol in acetonitrile

2005 ◽  
Vol 122 (18) ◽  
pp. 184511 ◽  
Author(s):  
Alexander E. Kobryn ◽  
Tsuyoshi Yamaguchi ◽  
Fumio Hirata
Keyword(s):  
Diffusion Coefficient ◽  
Relaxation Time ◽  
Pressure Dependence ◽  
Translational Diffusion ◽  
Rotational Relaxation ◽  
Equation Approach ◽  
Translational Diffusion Coefficient ◽  
Rotational Relaxation Time

The Measurement of Rotational Relaxation Time T2 for CH3C15N Self-and Foreign Gas Collisions

1979 ◽  
Vol 34 (7) ◽  
pp. 850-857 ◽  
Author(s):  
H. Mäder ◽  
H. Bomsdorf ◽  
U. Andresen
Keyword(s):  
Relaxation Time ◽  
Pressure Dependence ◽  
Rotational Relaxation ◽  
Emission Signal ◽  
Different Temperatures ◽  
Rotational Transitions ◽  
Effective Collision ◽  
Rotational Relaxation Time

We report on the measurement of T2 for several rotational transitions of CH3C15N. The transient emission signal is investigated at different temperatures for the pure gas and mixtures with He and H2, and effective collision diameters are derived from the pressure dependence of T2.

scholarly journals Lifetime and rotational relaxation time of dansylgalactoside bound to the lac carrier protein

1975 ◽  
Vol 250 (23) ◽  
pp. 8893-8896 ◽  
Author(s):  
S Schuldiner ◽  
RD Spencer ◽  
G Weber ◽  
R Weil ◽  
HR Kaback
Keyword(s):  
Relaxation Time ◽  
Rotational Relaxation ◽  
Carrier Protein ◽  
Rotational Relaxation Time

Rotational relaxation time of tRNA

1979 ◽  
Vol 71 (10) ◽  
pp. 4172-4174 ◽  
Author(s):  
M. Kochi ◽  
Erdogan Gulari ◽  
B. Chu
Keyword(s):  
Relaxation Time ◽  
Rotational Relaxation ◽  
Rotational Relaxation Time

Rotational relaxation time for hydrogen-helium system

1966 ◽  
Vol 19 (8) ◽  
pp. 642-643 ◽  
Author(s):  
T.K. Bose ◽  
H. Zink ◽  
A. Van Itterbeek
Keyword(s):  
Relaxation Time ◽  
Rotational Relaxation ◽  
Rotational Relaxation Time

Conformational Flexibility In Fibrinogen

1981 ◽  
Author(s):  
Roy R Hantgan
Keyword(s):  
Relaxation Time ◽  
Polyacrylamide Gel Electrophoresis ◽  
Fluorescence Emission ◽  
Structural Data ◽  
Rotational Relaxation ◽  
Average Lifetime ◽  
Rigid Sphere ◽  
Thrombin Activation ◽  
Hydrodynamic Data ◽  
Rotational Relaxation Time

The structure of fibrinogen in solution has been investigated by the technique of steady state fluorescence polarization. Factor XIII a has been employed to catalyze the incorporation of approximately 3 moles dansylcadaverine per mole fibrinogen without disruption of its structure or function. Two γ-chain and one α-chain crosslink acceptor sites have been labelled, according to SDS-polyacrylamide gel electrophoresis. Light scattering and electron microscopy verify that this derivative forms normal fibrin upon thrombin activation; the modified protein is 93% clottable. The fluorescence emission maxiumum is shifted to 500 nm (vs. 540 nm for dansylcadaverine) and a substantial increase in fluorescence intensity is noted. Measurements of the fluorescent lifetime, by a phase shift technique, show an average lifetime of 14.5 ±2.5 nanoseconds (vs. 3 ns for dansylcadaverine). The rotational relaxation time, determined from a Perrin plot of polarization vs. temperature, is 165 ±13 ns. No change in rotational relaxation time was found in 0.005 M CaCl2 or at high ionic strength. The limiting polarization (extrapolated to infinite viscosity) agrees with that determined with dansylcadaverine fibrin (coarse gel conditions) as well as with the vlaue measured in 75% glycerol at 0°C. These controls confirm that overall macromolecular motion, not probe rotation,is being measured.The measured rotational relaxation time for dansylcadaverine fibrinogen is substantially shorter than values calculated for an anhydrous rigid sphere (300 ns) or a prolate ellipsoid (1000 ns), as well as other models based on hydrodynamic data. These results indicate that the rotating unit is smaller than the entire fibrinogen molecule, i.e. that the structure of fibrinogen in solution is flexible. This observation is consistent with earlier polarization data reported for dansylchloride labelled fibrinogen, as well as structural data indicating fibrinogen to be a multidomain protein, whose globular portions are connected by helical chains.

Temperature dependence of the rotational relaxation time in nitrogen

1994 ◽  
Vol 231 (4-6) ◽  
pp. 444-448 ◽  
Author(s):  
Andrey E. Belikov ◽  
Ravel G. Sharafutdinov ◽  
Mikhail L. Strekalov
Keyword(s):  
Relaxation Time ◽  
Temperature Dependence ◽  
Rotational Relaxation ◽  
Rotational Relaxation Time
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