We explore the effects of particle size and solvent environment on the thermodynamic stability of two pairs of polymorphs subjected to ball-mill neat grinding (NG) and liquid assisted grinding (LAG). Two systems were studied: (i) forms I and II of a 1 : 1 theophylline : benzamide cocrystal and (ii) forms A and B of an aromatic disulfide compound. For both systems, the most stable-bulk polymorph...

C293 physico-chemical properties. NN414 is a very weak acid with pKa = 8.5, log P = 1.6, and molar weight Mw = 291.8 g/mol. Two true polymorphs, A and B, of this compound have been identified. Polymorph A crystallizes in needleshaped crystals with a triclinic unit cell by precipitation from a variety of solvents such as acetic acid, acetonitrile, diluted ammonia, methanol, N-methyl-pyrrolidone,...

A second, monoclinic, polymorph of the title compound, C19H19N3O, is reported. In this polymorph, the molecules are linked into chains by paired C-H...pi hydrogen bonds and the chains are linked into sheets by pi stacking interactions.

The technique of resonant ultrasound spectroscopy (RUS) was used to measure the second-order elastic constants of hydrated human dentin. Specimens were placed between two transducers, and the resonant frequencies of vibration were measured between 0.5 and 1.4 MHz. The elastic constants determined from the measured resonant frequencies in hydrated dentin exhibited slight hexagonal anisotropy, wi...

Proton 1H electron-nuclear double resonance spectra were obtained from cobalt-substituted hemoglobin A. For oxy cobalt-substituted hemoglobin (CoHb), two major couplings were found. One is exchangeable by deuterium and has a coupling of approximately 5.6 MHz which is assigned to the N epsilon 2-proton of the distal histidine (E7), interacting with the ligand. The other splitting (approximately ...

Lepidopteran insects mainly rely on sex pheromones to complete sexual communications. Pheromone receptors (PRs) are expressed the olfactory receptor neurons (ORNs) of sensilla trichodea and play an essential role in communication. Despite extensive investigations into mechanisms peripheral recognition Lepidoptera, knowledge about these L. sticticalis remains limited. In this study, five candida...

The crystal structures of three polymorphs Rb3ScF6 have been determined through a combination synchrotron, laboratory X-ray, and neutron powder diffraction, electron multinuclear high-field solid-state NMR studies. room temperature (RT; α) medium-temperature (β) are tetragonal, with space groups I41/a (Z = 80) I4/m 10) lattice parameters 20.2561(4) A, c 36.5160(0) A 14.4093(2) 9.2015(1) at RT 1...

Hysteresis in a Three-Equation Model by Thomas R. Michl JEL E11, E12, O42