Self-association, effect

Schiff bases, 256-259, 268, 270 to amines. 40 from aminothiazoles, 98 with 2-amino thiazoles, 30, 40 complexes of, 99 cyclization to, 42 IR spectra of, 41 in reduction by AlLiH,. 14 in reduction by NaBH4, 14 LTV spectra of, 41 see also Thiazolylamidines Schistosomacidal, 141 Schistosomiasis japonica, 145 Schotten-Bauman reaction. 51. 123 Sedative, 145. 148,438 Selective herbicide, 135 Self association, effect of, on UV spectra of A-4-thiazoline-2-thione. 381 A-4-thiazoline-2-one, relation with protomery, 377... 

The abbreviations mean amino-, epoxy-, carboxyl- and non-functional end-capped polybutadiene-acrylonitrile copolymers, respectively, of the same molar mass and 18% AN content. The polarity of rubbers changes in the same order except for CTBN. Lower values of CTBN miscibility in comparison with ATBN and ETBN can possibly be caused by the great self-association effect of carboxyl groups through hydrogen bonding with the formation of high molar mass chains. 

In HBD solvents the multiple hydrogen bonding effects and competing solvent self association effects vide infra) are too complex to unravel but, if consideration is limited to aliphatic nonprotic solvents of the select solvent set discussed earlier (4,5,11,16,18,23,25,29,41,50,51,52) (see Section I), the logarithm of the rate constant is well correlated by a linear combination of tt and / ,... 

A study of the effect of substitution patterns in oxadiazoles and isoxazoles and their effect on the UV spectra in the lO -lO M concentration range was performed. Hypso-chromic effects and deviations from Beer s law were observed and were believed to be associated with antiparallel, sandwich-type self-association via dipole-dipole interactions. Beer s law is followed when the molecular dipole moments are small or when self-association is sterically hindered. 

Stability of anthocyanins can be attained by self-association, that is, when two or more anthocyanin molecules are associated. This effect was verihed by increasing the concentration of the cyanidin 3,5-diglucoside solution from 10 M to 10 M with a consequent bathochromic shift in maximum wavelength absorption in the visible region. "... 

In donating solvents the subtle effects determining the chemical shift in chloroform, benzene, and hexane are apparently masked. In hexane, which is considered a poor solvent, self-association is possible and would explain the appearance of the Sn spectrum. Chloroform and benzene are excellent solvents for organometallic polymers, and the structure and downfield position support a well-solvated, unassociated environment. 

Gelling agents under appropriate conditions self-associate to produce a three-dimensional structure. Some gelling, as with gelatine, is thermo-reversible while others, such as with high methoxyl pectin, is irreversible. Apart from the effects on the texture of the product an irreversible gelling agent is more of a problem in the factory since it cannot readily be recycled. 

CS2 and acetone. The increases of 1.3-2.0 Hz depending on the temperature were about half the size of the temperature effects. Both were attributed to self association of the ethyl formate. Dhingra et al. 28> reported that /13 of tri-fluoroacetic acid increases with decreasing concentration in CC14, dioxane, acetone, water and acetonitrile. The change was apparently in order of the di-... 

In a pressure study involving a multimeric enzyme, it will in general not be possible to decide how much of the effect is due to direct influence of pressure on the catalytic process and how much of it is due to indirect influence through subunit dissociation and accompanying deactivation. Generally, a self-association reaction may be expressed in either of two equivalent forms ... 

Physical properties of the protein structure should be considered in designing strategies to achieve stable formulations because they can often yield clues about which solution environment would be appropriate for stabilization. For example, the insulin molecule is known to self-associate via a nonspecific hydrophobic mechanism66 Stabilizers tested include phenol derivatives, nonionic and ionic surfactants, polypropylene glycol, glycerol, and carbohydrates. The choice of using stabilizers that are amphiphilic in nature to minimize interactions where protein hydrophobic surfaces instigate the instability is founded upon the hydro-phobic effect.19 It has already been mentioned that hydrophobic surfaces prefer... 

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