Polyethylene is the most popular man-made polymer. One way of making polyethylene consists in producing the polymer in the form of grains suspended by a gas flow of olefins (monomers), nitrogen and other hydrocarbons (alkanes). Industrials want to know the solubility of the monomers in the polyethylene grains, as the rate of the polymerization reaction is a direct function of this solubility. T...

At 25 degrees C, frog sartorius muslces rapidly gained Na+ and lost K+ in iodoacetamide and pure nitrogen. Beginning at normal levels, the concentrations of these ions in the cells reached those in the surrounding Ringer solution in 140 min. Yet during that time the Na+ efflux rate showed no sign of the slowing down demanded by Na-pump theory. The data support the view that maintenance and alte...

The feasibility of using untreated rapeseed meal as a nitrogen source for iturin A production by Bacillus subtilis 3-10 in submerged fermentation was first evaluated by comparison with two different commercial nitrogen sources of peptone and ammonium nitrate. A significant promoting effect of rapeseed meal on iturin A production was observed and the maximum iturin A concentration of 0.60 g/L wa...

We have studied the dispersion and exfoliation of four inorganic layered compounds, WS2, MoS2, MoSe2 and MoTe2 in a range of organic solvents. The aim was to explore the relationship between the chemical structure of the exfoliated nanosheets and their dispersability. Sonication of the layered compounds in solvents generally gave few-layer nanosheets with lateral dimensions of a few hundred nan...

BACKGROUND O. stamineus is a medicinal herb with remarkable pharmacological properties. However, poor solubility of the active principles limits its medicinal value. This study sought to prepare nano liposomes of OS ethanolic extract in unpurified soybean phospholipids in order to improve its solubility and permeability. OS liposomes were prepared by the conventional film method, and were chara...

Poor ammonia-nitrogen removal in methanogenic anaerobic reactors digesting animal manure has been reported as an important disadvantage of anaerobic digestion (AD) in several studies. Development of anaerobic processes that are capable of producing reduced ammonia-nitrogen levels in their effluent is one of the areas where further research must be pursued if AD technology is to be made more eff...

The urinary nitrogen excretion of sheep offered a low nitrogen diet was lower than when the sheep were fed a nitrogen-free mixture post-ruminally. This result is discussed in terms of Folin’s (1905) definition of endogenous nitrogen, and the nitrogen recycling and utilization which can occur in the rumen/reticulum of sheep. Reasons are given why post-ruminal feeding should give an endogenous ni...

The ruthenium(III) complex Hlnd trans-[RuCl(4),(ind)(2)], with two trans-standing indazole (ind) ligands bound to ruthenium via nitrogen, shows remarkable activity in different tumor models in vitro and in vivo. The solvolysis of the complex trans-[RuCl(4),(ind)(2)](-) has been investigated by means of spectroscopic techniques (UV/vis, NMR)in different solvents. We investigated the indazolium a...

We present a comprehensive theoretical approach to determine concentrations of dopant impurities in semiconductors. The formalism is applied to the problem of acceptor doping in ZnSe. Formation energies and concentrations of impurities and native defects are expressed as a function of chemical potentials, for which experimentally accessible ranges are calculated. We show that limitations in the...