Models for binary and multicomponent solutions a new prospectus

We have examined in detail the principal series which have been used to represent the thermodynamcs of binary systems and have concluded that in every case the higher members suffer in some important way. The best choice for a third member is based upon a series expansion of the statistical mechanical treatment of Guggenheim. An entirely new form for the fourth term is suggested for accommodating the temperature dependent part of the asymmetry.We have also determined what constitutes proper treatment of the binary terms in representing higher order systems. Not all the previous treatments have been correct in this respect.     

Removal of Oxide Contamination from TiB2 Powders

Surface oxide contamination, which commonly occurs in fine TiB₂ powders and afects their properties, can be removed by treatment with BCl₃(g) at 650°C .     

Incompatibility between the kohler method and the subregular model

It is demonstrated that the Kohler method is incompatible with the subregular model, because it gives rise to a dichotomy in the predicted behavior of the partial (excess) free energy of a solute in the terminal regions of the ternary system.     

Evidence that Tn5565, which includes the enterotoxin gene in Clostridium perfringens, can have a circular form which may be a transposition intermediate

The Clostridium perfringens enterotoxin gene is on a transposon-like element, Tn5565, integrated in the chromosome in human food poisoning strains. The flanking IS elements, IS1470 A and B, are related to IS30. The IS element found in the transposon, IS1469, is related to IS200 and has been found upstream of cpe in all Type A strains. PCR and sequencing studies from cell extracts and plasmid isolations of C. perfringens indicate that Tn5565 can form a circular form with the tandem repeat (IS1470)2, similar to the transposition intermediates described for a number of IS elements.     

Experimental and Thermodynamic Study of Nonstoichiometry in 〈YBa2Cu3O7-x〉

The dependence of the nonstoichiometry of 〈YBa₂Cu₃O_7−x〉 (solid) has been studied over 5 orders of magnitude in oxygen pressure and from 573 to 1173 K. Hydrogen-reduction methods for determining the absolute oxygen to-metal ratio were developed. The resulting data were used to derive a chemical thermodynamic representation of the experimental variables. The data were used to derive a chemical thermodynamic representaltion of the experimental variables. The data were also compared with several other investigations to indentify the selfconsistent sets of data. The present data and thermodynamic data from the literature were correlated on an Ellingham diagram.