The non-Newtonian behaviour of dilute solutions of polymers. V. Non-Newtonian viscosity of poly(phenylsilsesquioxane) solutions in relation to the rigidity of the polymeric chain

1970 ◽  
Vol 35 (9) ◽  
pp. 2564-2570 ◽  
Author(s):  
O. Quadrat
Keyword(s):  
Polymeric Chain ◽  
Dilute Solutions ◽  
Newtonian Viscosity

Non-Newtonian viscosity and excluded volume effect of dilute solutions of flexible high polymers

1971 ◽  
Vol 75 (8) ◽  
pp. 1141-1149 ◽  
Author(s):  
Yoshihiko Sugiura ◽  
Noriko Yamaguchi ◽  
Koji Okano ◽  
Eiichi Wada
Keyword(s):  
Volume Effect ◽  
Excluded Volume ◽  
Dilute Solutions ◽  
Newtonian Viscosity ◽  
Excluded Volume Effect ◽  
High Polymers

Infrared absorptions and band widths of dilute solutions of CF3H in liquid Ar, N2, and Xe

1999 ◽  
Vol 96 (12) ◽  
pp. 1745-1755
Author(s):  
DAVID L. CEDENO, JINGPING PENG, DOVIE REY
Keyword(s):  
Dilute Solutions

Molecular Transformations in DNA under the Influence of UV-radiation

2020 ◽  
Vol 04 ◽  
Author(s):  
Vigen G. Barkhudaryan ◽  
Gayane V. Ananyan ◽  
Nelli H. Karapetyan
Keyword(s):  
Uv Radiation ◽  
Uv Irradiation ◽  
Absorption Spectroscopy ◽  
Calf Thymus Dna ◽  
Dilute Solutions ◽  
Concentrated Solutions ◽  
Buffer Solution ◽  
Low Concentration ◽  
Calf Thymus ◽  
Dna Solutions

Background: The processes of destruction and crosslinking of macromolecules occur simultaneously under the influence of ultraviolet (UV) radiation in synthetic polymers, dry DNA and their concentrated solutions. Objective: The effect of UV radiation on calf thymus DNA in dilute solutions subjected to UV- irradiation was studied in this work. Method: The calf thymus DNA was studied in dilute solutions using viscometry, absorption spectroscopy and electrophoresis. Results: It was shown, that at a low concentration of DNA in the buffer solution ([DNA] = 85 μg / ml) under the influence of UV radiation, the processes of destruction of macromolecules and an increase in their flexibility predominate, which is accompanied by a gradual decrease in the viscosity of their solution. In addition, due to the low concentration of the solution, intramolecular crosslinking of macromolecules predominates, which also reduces their size and, consequently, the viscosity of the solution. Conclusion: It was concluded, that in dilute DNA solutions, due to the predominance of the processes of intramolecular crosslinking of macromolecules over intermolecular, only constant processes of decreasing the sizes of DNA macromolecules occur. As a result, its solubility remains virtually unchanged during UV irradiation. The described comments are also excellently confirmed by the results of absorption spectroscopy and electrophoresis

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