Hyperchromicity measurements and quasi-elastic laser light scattering (QELS) have been used to assess the solution structure of the metabolically stable E. coli 4.5S RNA. Results from thermal denaturation measurements revealed the 4.5S species to be markedly more stable than most other RNAs characterized thus far. Optical Tm's range from 79 degrees to 88 degrees with transitions approximately 2...

The problems involved in calculating correlation factors for diffusion in dilute alloys can be contrasted to those arising in concentrated solid solutions. As one moves from the pure element to the dilute alloy to the concentrated alloy, the calculation becomes progressively more difficult. Because of the complex atom configurations which can occur in concentrated alloys, it usually is not poss...

the overall aim of this study is to calculate some water properties in the single wall carbon naotubes (swcnt) and compare them to the bulk water properties to investigate the deviation of water properties inside the swcnt from those in the bulk. here some physical and transport properties of water molecules in the single wall carbon nanotube were reported by performing molecular dynamics (md) ...

interaction of menthol with polyethylene terephthalate bottles during storage time was tested at three different temperatures. menthol is a mint flavor agent added to yogurt drinks in iran and is considered as a factor affecting consumer acceptance. absorption of menthol to packaging material could cause a loss of quality in the final product due to diminished flavor intensity. tests were done ...

The permeability coefficients obtained by means of an infinite dose diffusion cell system with nude mouse skin in vitro were compared to the ether-water partition coefficients of the following compounds: glucose, urea, glycerol, thiourea, alkanols (methanol to octanol), hydrocortisone and hydrocortisone 21-n-alkyl esters (-acetate to -heptanoate). The permeability coefficients ranged from 1.0 x...

In this paper, a theory on the determination of the diffusion coefficient of the excess minority carriers of a silicon solar cell is presented. The expression of the diffusion coefficient, related to the modulation frequency, the irradiation energy and the damage coefficient is studied and then performed by using the impedance spectroscopy method and Bode and Nyquist diagrams. Based on the diff...