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Digitale Medien

Preparation and application of monoclonal antibodies to fertility α2-microglobulinmicroglobulin (1997)

Boltovskaya, M. N. ; Starosvetskaya, N. A. ; Marshitskaya, M. I. ; [weitere]

Springer

Bulletin of experimental biology and medicine 124 (1997), S. 904-906

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ISSN: 1573-8221

Schlagwort(e): fertility α2-microglobulin ; monoclonal antibodies ; sperm ; extracorporeal fertilization

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Abstract An FAMG-Fertitest-M test-system for quantitation of fertility α2-microglobulin (FAMG) in biological fluids has been developed. It is based on original monoclonal antibodies against two different epitopes of FAMG. The range of FAMG concentrations reflecting thein vitro fertilizing capacity of sperm is determined, which allows one to assess the effectiveness of extracorporeal fertilization in the treatment of infertility.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02446998

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Digitale Medien

Electrical transport in 0-3 epoxy resin-barium titanate-carbon black polymer composites (1998)

Tchmutin, I. A. ; Ponomarenko, A. T. ; Shevchenko, V. G. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 1847-1856

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ISSN: 0887-6266

Schlagwort(e): electrical transport ; dielectric properties ; barium titanate ; carbon black ; epoxy resin ; relaxation processes ; Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Conductivity and dielectric constant of a three-component 0-3 composite of epoxy resin-barium titanate-carbon black (0-3 composites are systems in which the filler is in the form of 0-dimensional (point-like, disperse) particles in a three-dimensional polymeric matrix1) have been investigated both at DC and the frequency range of 20-106 c/s. The effect of barium titanate concentration on percolation threshold, critical indices and the mechanism of conduction has been examined. An attempt was made to describe the electrical properties of composites with models originally developed for two-component systems' dielectric-conductor. With increasing barium titanate concentration the agreement of experimentally found frequency dependencies of conductivity and dielectric constant with models based on Debye's equation was found to degrade. An adequate description of electrical properties of composites' dielectric-ferroelectric-conductor should be based on the Havriliak-Negami equation. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1847-1856, 1998

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

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Digitale Medien

The formation of polyethylene terephthalate in the presence of dicarboxylic acids (1979)

Chegolya, A. S. ; Shevchenko, V. V. ; Mikhailov, G. D.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 889-904

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ISSN: 0360-6376

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The process of polyethylene terephthalate (PET) formation in the presence of dicarboxylic acids has been studied. Certain amounts of terephthalic acid (TPA) have two- to threefold accelerating efficiency in the polycondensation process. To elucidate the causes of the acceleration the main reactions leading to PET formation in the presence of dicarboxylic acids have been investigated by the use of models. The evaluation of kinetic and equilibrium parameters obtained for model reactions made it possible to conclude that the influence of carboxyl-containing additives on the apparent rate of polycondensation manifests itself in accelerating direct reactions and facilitating the liberation of the eliminated by-product; that is, ethylene glycol (EG) from the polymer melt. Carboxylic acid acts as a catalyst on the ester interchange of 2-hydroxyethyl ester end groups and thus increases the rate of polymer formation in this reaction 10-40 times. The parallel interaction between the 2-hydroxyethyl ester end group and the carboxyl group of the added acid is also catalyzed by the acid and its rate constant is four times larger than that of the catalytic polycondensation of 2-hydroxyethyl ester end groups. Unlike EG, the reaction water formed in the process is more readily removed from the reaction system and thus promotes the intensification of the process. In addition, the carboxyl groups react with the eliminated EG to decrease its amount and shift the equilibrium toward polymer formation. The investigation of the consequent parallel reactions on models made it possible to draw a conclusion about the higher reactivity of 2-hydroxyethyl esters in the esterification processes. This fact has been explained by strengthening the nucleophilicity of the oxygen atom in the hydroxyl of a 2-hydroxyethyl ester group compared with that of EG; for example, by the formation of an intramolecular cycle involving a hydrogen bond. Simultaneously, it has been found that in the system simulating PET polycondensation in the presence of dicarboxylic acids the reaction mechanism involves the catalysis by a proton formed during the carboxyl group dissociation and accepted by the 2-hydroxyethyl ester group.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1979.170170326

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