scholarly journals Comparison of the Overall Motion Correlation Times of Several Mammalian Serum Albumins in Dilute Solutions Determined on the Basis of Maxwell Effect and the Debye-Stokes-Einstein Equation.

2017 ◽  
Vol 40 (1) ◽  
pp. 1-10
Author(s):  
Karol Monkos
Keyword(s):  
Einstein Equation ◽  
Intrinsic Viscosity ◽  
Correlation Time ◽  
Dilute Solution ◽  
Serum Albumins ◽  
Solution Ph ◽  
Correlation Times ◽  
Principal Axes ◽  
The Times ◽  
Maxwell Effect

Abstract One of the rarely used ways of determining the overall motion correlation time of proteins is method based on the Maxwell effect. This effect consists in the appearance of a stimulated birefringence in liquids or solutions and induced by the mechanical force like shear stress in a streamline flow. To determine the overall motion correlation time for protein in dilute solution is sufficient to know the molecular mass and the ratio of the principal axes of protein, and an intrinsic viscosity. The intrinsic viscosity has been measured using an Ubbelohde-type capillary microviscometer immersed in a water-bath controlled thermostatically in the range from 5°C to 45°C for six mammalian albumins. To check the influence of solution pH on the overall motion correlation time the intrinsic viscosity value of the human serum albumin in solutions at the isoelectric point and beyond of it was measured. The thus obtained correlation times were compared with the times determined on the basis of the Debye-Stokes-Einstein equation.

Viscosity and Molecular Weight of Masticated Styrene-Butadiene Rubber

1965 ◽  
Vol 38 (4) ◽  
pp. 961-966 ◽  
Author(s):  
S. K. Bhatnagar ◽  
S. Banerjee
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Crosslink Density ◽  
Empirical Relation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Mooney Viscosity ◽  
The Times ◽  
Styrene Butadiene

Abstract Changes in the value of [η], [ηm], K′, (M) and μ of SBR masticated in the cold at 25.0 ± 5.0° C in presence of oxygen with the times of mastication are reported. An empirical relation has been developed between the intrinsic viscosity [η] and Mooney viscosity [ηm] which permits molecular weight of the rubber to be determined directly from Mooney viscosity. The value of g which appears in the Flory equation connecting true crosslink density with the physically determined one has been calculated for unfilled SBR.

Dilute solution properties of poly(d,l-lactide) by static light scattering, SAXS, and intrinsic viscosity

2019 ◽  
Vol 52 (4) ◽  
pp. 387-396 ◽  
Author(s):  
Yoshinori Suzuki ◽  
Takahiro Watanabe ◽  
Hiroki Kosugi ◽  
Kayo Ueda ◽  
Moriya Kikuchi ◽  
...  
Keyword(s):  
Light Scattering ◽  
Intrinsic Viscosity ◽  
Static Light Scattering ◽  
Solution Properties ◽  
Dilute Solution ◽  
Dilute Solution Properties

Coherence resonance induced by cross-correlated sine-Wiener noises in the FitzHugh–Nagumo neurons

2017 ◽  
Vol 31 (28) ◽  
pp. 1750204 ◽  
Author(s):  
Yuangen Yao ◽  
Ming Yi ◽  
Dejia Hou
Keyword(s):  
Correlation Time ◽  
Parameter Range ◽  
Coherence Resonance ◽  
Correlation Times ◽  
Excitable Systems

We study coherence resonance (CR) in the FitzHugh–Nagumo (FHN) neurons under cross-correlated sine-Wiener (CCSW) noises. It is numerically demonstrated that the reciprocal coefficient of variance of inter-spike intervals (R) increases with increasing amplitude or correlation time of CCSW noises, reaches the maximum at proper amplitude or correlation time, and then decreases, suggesting the appearance of CR phenomenon. In addition, the occurrence of CR is sensitive to a parameter range of amplitudes and correlation times of CCSW noises. Thus, CR can be controlled by regulating the amplitudes and correlation times of CCSW noises in the FHN excitable systems.

A RESEARCH NOTE ON INTRINSIC VISCOSITY OF HIGH METHOXYL PECTIN IN DILUTE SOLUTION: INFLUENCE OF SWEETENERS

2007 ◽  
Vol 38 (5) ◽  
pp. 635-644
Author(s):  
VAHID SAMAVATI ◽  
SEYED HADI RAZAVI ◽  
SEYED MOHAMMAD MOUSAVI ◽  
MEHRNAZ AMINIFAR
Keyword(s):  
Intrinsic Viscosity ◽  
Research Note ◽  
Dilute Solution

Basicity, Water Solubility and Intrinsic Viscosity of Carboxymethyl Chitosan as a Biofunctional Material

2012 ◽  
Vol 531 ◽  
pp. 507-510 ◽  
Author(s):  
Xiang Ping Kong ◽  
Juan Wang ◽  
Chun Jie Wang ◽  
Xia Wu
Keyword(s):  
Molecular Weight ◽  
Acetic Acid ◽  
Intrinsic Viscosity ◽  
Water Solubility ◽  
Average Molecular Weight ◽  
Carboxymethyl Chitosan ◽  
Molecular Weight Determination ◽  
Solution Ph ◽  
Alkaline Conditions

The basicity, water solubility, intrinsic viscosity and molecular weight of carboxymethyl chitosan (CM-chitosan) were investigated. The solution pH remained at about 9.2 at the concentration of higher than 2.0 g/L. The isoelectric point of CM-chitosan was about 4.5 of pH, and the solubility of CM-chitosan at the solution pH of 2.0 to 6.0 was lower than 5 g/L. The acetic acid could be replaced by hydrochloric acid as solvent for the viscosity-average molecular weight determination of chitosan. The intrinsic viscosity values of CM-chitosan have significant differences in acidic and alkaline conditions. The viscosity-average molecular weight of CM-chitosan was (3.8 ± 0.2) × 105, consistent with that of product chitosan of blank test.

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