scholarly journals МОДИФИЦИРОВАНИЕ КОЛЛАГЕНА И ЖЕЛАТИНА ПОД ДЕЙСТВИЕМ МИКРОВОЛНОВОГО ПОЛЯ

World Science ◽  
2020 ◽  
Vol 1 (4(56)) ◽  
pp. 41-44
Author(s):  
Саевич О. В. ◽  
Чернушенко О. О.
Keyword(s):  
Physicochemical Properties ◽  
Structure Formation ◽  
Structural Modification ◽  
Microwave Field ◽  
Field Exposure ◽  
Microwave Exposure ◽  
Isoelectric Points ◽  
Kinetics Of ◽  
Field Influence ◽  
Kinetics Of Swelling

The microwave field influence on the physicochemical properties of collagen and gelatin was studied. It is shown that when microwave field acts on the studied protein samples, a change in the molecules structure formation occurs. It was experimentally established that microwave exposure leads to the structural modification of collagen and gelatin molecules. This modification is accompanied by a change in the physicochemical properties of the studied biopolymers. It is shown that microwave field exposure leads to a decrease in the viscosity of collagen and gelatin solutions. A decrease in viscosity indicates that there’s a structural or transient processes occurring in protein molecules.The kinetics of swelling with time for collagen and gelatin samples was studied. It is shown that the use of a microwave field leads to a decrease in the rate constant of swelling. The swelling degree of the studied samples decreases on average by 60%. It is shown that isoelectric points of the proteins are shifted (pI from 5 to 6 for collagen and up to 5.5 for gelatin).

Characteristics Of The Structure Formation Of Gypsum Binder Modified With Zinc Hydrosilicates

2020 ◽  
pp. 40-46
Keyword(s):  
Synergistic Effect ◽  
Physicochemical Properties ◽  
Structure Formation ◽  
Silicic Acid ◽  
Chemical Properties ◽  
Crystal Formation ◽  
Ability To Act ◽  
Chemical Factors ◽  
Sorption Characteristics

The authors' methodic for assessing the role of chemical and physic-chemical factors during the structure formation of gypsum stone is presented in the article. The methodic is also makes it possible to reveal the synergistic effect and to determine the ranges of variation of controls factors that ensure maximum values of such effect. The effect of a micro-sized modifier based on zinc hydro-silicates on the structure formation of building gypsum is analyzed and corresponding dependencies are found. It is shown that effects of influence of modifier on the properties of gypsum compositions are determined by chemical properties of modifier. Among the mentioned properties are sorption characteristics (which depend on the amount of silicic acid and its state) and physicochemical properties - the ability to act as a substrate during crystal formation. The proposed method can also be extended to other binding substances and materials. This article contributes to the understanding of the processes that occur during the structure formation of composites, which will make it possible to control the structure formation in the future, obtaining materials with a given set of properties.

The heat of interaction of polyvinylchloride with plasticizers, the kinetics of swelling and phase equilibrium

1983 ◽  
Vol 25 (7) ◽  
pp. 1668-1675 ◽  
Author(s):  
A.A. Tager ◽  
Yu.S. Bessonov ◽  
T.V. Ikanina ◽  
T.A. Rodionova ◽  
A.I. Suvorova ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Kinetics Of ◽  
Kinetics Of Swelling

scholarly journals FEATURES OF QUANTITATIVE MEASUREMENTS OF THE DYNAMIC MODULE OF ELASTICITY OF BINDERS IN OPTIMIZATION OF PRODUCTION TECHNOLOGY SEROGYPSUM COMPOSITE

2021 ◽  
pp. 86-92
Author(s):  
V.I. Tarasevych ◽  
◽  
Yu.G. Gasan ◽  
V.B. Dolgoshey ◽  
◽  
...  
Keyword(s):  
Time Dependence ◽  
Structure Formation ◽  
Elastic Properties ◽  
Physicochemical Characteristic ◽  
Resonance Method ◽  
Acoustic Resonance ◽  
Mechanical Action ◽  
Bending Vibrations ◽  
Damping Decrement ◽  
Kinetics Of

The paper considers the issues of studying the structure formation of binders during hardening to determine the optimal moments of mechanical action on gypsum concrete specimens, which makes it possible to optimize the technology of their impregnation with sulfur melt. The time dependence of the elastic modulus of a hardening, binder is its important physicochemical characteristic, since it is used to objectively identify the stages of structure formation, to simulate the processes occurring at each of the stages. It is noted that the method of acoustic resonance of bending vibrations, in the case of hardening binders, needs correction with respect to the measurement technique and interpretation of the results obtained. The kinetics of the resonance frequency of a sample consisting of a rigid cell and a dispersion poured into it is a function of the elastic properties of the cell, the dispersion itself, the contact zone of the dispersion with cell and therefore cannot be used for either qualitative or quantitative analysis of the kinetics of hardening. Taking into account the elasticity of cuvette is necessary to obtain reliable information. It has been established that in the presence of shrinkage or significant expansion of the binder, the study of structure formation by the resonance method should be carried out in plastic cuvettes. Regardless of shrinkage, the use of a cuvette requires compulsory consideration of its elastic properties. It is advisable to objectively distinguish the stages of structure formation on the basis of the kinetics of not the dynamic modulus of elasticity itself, but the rate of its change. The time dependence of the logarithmic damping decrement is also an important characteristic of the concrete structure. The studies carried out make it possible to obtain serogypsum composites with the necessary performance characteristics and to manufacture elements of architectural décor, wall fencing products of increased aesthetics, durability and reliability from them.

Physicochemical properties and kinetics of transferase activity of invertase

1999 ◽  
Vol 35 (6) ◽  
pp. 665-667 ◽  
Author(s):  
D. T. Mirzarakhmetova ◽  
S. Kh. Abdurazakova ◽  
Z. R. Akhmedova ◽  
Sh. S. Burikhanov
Keyword(s):  
Physicochemical Properties ◽  
Transferase Activity ◽  
Kinetics Of

scholarly journals In-situ kinetics of modifications induced by swift heavy ions in Al2O3: Colour centre formation, structural modification and amorphization

2017 ◽  
Vol 140 ◽  
pp. 157-167 ◽  
Author(s):  
C. Grygiel ◽  
F. Moisy ◽  
M. Sall ◽  
H. Lebius ◽  
E. Balanzat ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Structural Modification ◽  
Colour Centre ◽  
Swift Heavy Ions ◽  
Kinetics Of
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