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Allylic PO-ylides generated by deprotonation of 2-alkenyldiphenylphosphine oxides with BuLi were used to prep. 1,3-dienes trans-selectively. The (Z/E) ratios of the newly formed double bond are 1:99 when straight-chain, while they were 2:98 to 4:96 when b- ...
The conformational search for favorable intramolecular interactions during protein folding is limited by intrachain diffusion processes. Recent studies on the dynamics of loop formation in unfolded polypeptide chains have focused on loops involving residue ...
Placing concrete requires much more water than the cement needs for its hydration. This results in an important porosity in the hardened concrete, which accentuates the degradation of this material. By adding small amounts of polymeric admixtures, called s ...
HMT-C11 belongs to the family of adducts formed by the cocrystallization of N-4(CH2)(6) molecules ( hexamethylenetetramine or HMT) and aliphatic dicarboxylic acids HOOC(CH2)(n-2)COOH with 5 less than or equal to n less than or equal to 13 (Cn). The adducts ...
Comprehensive counterion activity studies have revealed clear influence of the polyelectrolyte concn. and chain length on the polyion-counterion interaction, neither of which is evident from the existing theor. models. The counterion activity coeff. (fa) i ...
A simple solution technique was used to incorporate polyethylene oxide (PEO, of 5000, 10,000, 18,500, and 100,000 g/mol) and other water-soluble polymers such as polyvinylpyrrolidone and polyethyl oxazoline into the surfaces of commonly used biomedical pol ...
Despite progress during the last decade, the behavior of charged macromolecules, polyelectrolytes, including their interactions is not yet completely understood. In particular, interactions with oppositely charged surfaces, which play a significant role in ...
Poly(vinylbenzylammonium chloride) (PVBAC) polyelectrolytes possessing defined chain lengths, narrow chain length distributions, uniform charge d., but substituents of different hydrophilicity and size at the quaternary ammonium group were used as model co ...
The rate of formation of intramolecular interactions in unfolded proteins determines how fast conformational space can be explored during folding. Characterization of the dynamics of unfolded proteins is therefore essential for the understanding of the ear ...
Optical and transmission electron microscopy have been used to investigate the microdeformation mechanisms in thin films of amorphous semi-aromatic polyamides with different chemical structures and chain lengths. In the chosen range of test temperatures (b ...
