Experimental study of the ferroelastic phase transition in urea/n-heptadecane composite

Article Abstract:

The ferroelastic phase transition in urea/n-heptadecane CO[(N[H.sub2.]).sub.2]/[C.sub.17][H.sub.40] composite around the structural phase transition undergone by this crystal at 159 K is analyzed. A phenomenological model is used to describe the phase transition from the hexagonal to the orthorhombic phases of the urea, which has resulted in a linear relation between the excess entropy and the spontaneous strain and the bifringence.

Science & research, Research, Phase transformations (Statistical physics), Phase transitions (Physics), Ferroelectric crystals

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Experimental charge density study of estrogens: 17[beta]-estradiol-urea

Article Abstract:

The charge density analysis of the series of 17[beta]-estradiol urea using optical coordinate system and slow, initially constrained refinement is presented. It is observed that the oxygen atoms seem to be near to [sp.sup.3] in shape, demonstrating two consistent, distinct lone pairs despite varying chemical environments.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Estrogen & Progestogen Preps, Estrogen, Estrogens, Estradiol

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The influence of Urea and trimethylamine-N-oxide on hydrophobic interactions

Article Abstract:

The potentials of mean force for pairs of neopentane molecules immersed in aqueous solutions containing urea, trimethylamine-N-oxide (TMAO) obtained through molecular dynamics simulations suggest that TMAO does not counter the protein denaturing effect of urea by enhancing hydrophobic attraction amongst nonpolar groups.

Analysis, Methyl groups, Hydrophobic effect, Methyl compounds

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