New solid propellants based on energetic binders and HNF

In view of Europe’s need of more energetic storable solid rocket propellants, a formulation based on hydrazinium nitroformate (HNF) as oxidizer, and glycidyl azide polymer (GAP) and aluminum as fuels was identified in the past as very promising[1]. This propellant formulation does not contain chlorine or chlorine compounds and is with respect to...

Mechanism of oxygen diffusion in glassmelts containing variable-valence ions

A mechanism is proposed to describe the influence of redox reactions, which involve variable-valence ions, on the diffusional mass transport of molecular dissolved oxygen in glassmelts. The concentration profile for molecular dissolved oxygen in a melt with diffusional transport in one direction in a Cartesian coordinate system is described by a...

The relation between the oxidative biotransformation of hexachlorobenzene and its porphyrinogenic activity

The relation between the major toxic effect of hexachlorobenzene, hepatic porphyria, and its oxidative biotransformation was studied in vivo, by observing the effect of modulating its biotransformation on the expression of porphyria. This modulation was achieved by selective in vivo inhibition of the major cytochrome P450 isoenzyme involved in...

Methanol dehydrogenase: Mechanism of action

Chemicals/CAS: alcohol dehydrogenase, 9031-72-5; alcohol dehydrogenase (acceptor), EC 1.1.99.8; Alcohol Oxidoreductases, EC 1.1; Alcohols

Porcelain enamelled absorbers, coated by special selective tin oxide

The use of porcelain enamelled absorbers in flat plate collectors features longevity thanks to the durability and thermal stability of the enamel finish. The porcelain enamel can be made spectral selective by coating with doped tin oxide or indium oxide. The application procedure involves an enamelling step followed by a pyrosol process with tin...

Fluorimetric determination of menadione sodium bisulphite (vitamin K3) in animal feed and premixes by high-performance liquid chromatography with post-column derivatization

Chemicals/CAS: menadione sodium bisulfite, 130-37-0; menadione, 58-27-5; 2-methyl-1,4-dihydronaphthalene, 2717-43-3; Naphthalenes; Vitamin K 3, 58-27-5; Vitamin K, 12001-79-5.

Bile acids and lipids in isolated rat hepatocytes. II. Source of cholesterol used for bile acid formation, estimated by incorporation of tritium from tritiated water, and by the effect of ML-236B

Chemicals/CAS: cholesterol, 57-88-5; cholic acid, 32500-01-9, 361-09-1, 81-25-4; colestyramine, 11041-12-6, 58391-37-0; compactin, 73573-88-3; lipid, 66455-18-3; tritium oxide, 14940-65-9; Bile Acids and Salts; Cholesterol, 57-88-5; Cholestyramine, 11041-12-6; compactin, 73573-88-3; Lipids; Naphthalenes; Tritium, 10028-17-8

Formation of chemical compounds from irradiated mixtures of aromatic hydrocarbons and nitrogen oxides

The paper describes the analysis of products of the photochemical degradation of toluene and toluene-14C in smog chamber experiments. Compounds identified included methylglyoxal, possibly the recently postulated butenedial and other carbonyl compounds. The main product of photochemical degradation of methylglyoxal appeared to be acetaldehyde....

The antimutagenic effect of an extract of the mussel Mytilus edulis

Chemicals/CAS: 4 nitroquinoline 1 oxide, 56-57-5; benzo[a]pyrene, 50-32-8; nitrofural, 59-87-0

Short term inhalation toxicity studies with peroxyacetyl nitrate in rats

The inhalation toxicity of peroxyacetyl nitrate (PAN) was examined in acute (single exposure), subacute (4-wk repeated exposure) and subchronic (13-wk repeated exposure) studies in rats. The 4-hr LC50 was found to be 95 ppm. In the 4-wk study rats were exposed to 0, 0.9, 4.1 or 11.8 ppm PAN vapor for 6 hr/day, 5 days/wk. Exposure to 11.8 ppm...

Fotochemische smogvorming in Nederland (Photochemical smog formation in the Netherlands)

Radiosensitization of biologically active DNA in cellular extracts by oxygen. Evidence that the presence of SH compounds is not required

The radiosensitization by oxygen of biologically active bacteriophage DNA in bacterial extracts was studied. The oxygen effect in such a system appeared not to be due or only to a minor extent to the presence of endogenous sulphydryl compounds. The components in a cell extract which enable oxygen and other sensitizers to sensitize DNA could not...

Influence of the radiosensitizers paranitroacetophenone and triacetoneamine N oxyl on the effects of ionizing radiation on DNA

Paranitroacetophenone (PNAP) and triacetoneamine N oxyl (TAN), which sensitize anoxic cells to ionizing radiation, do not increase the radiosensitivity of bacteriophage DNA irradiated in the dry state, showing that the 'direct action model' of sensitization does not hold in this experimental set up. PNAP and TAN added within 1.5 msec after...

Protection against toxic compounds: chemical and technological aspects

Induction of cytochrome formation and stimulation of oxidative dissimilation by hemin in Streptococcus lactis and Leuconostoc mesenteroides

Aerobic glucose dissimilation of washed cells of Streptococcus lactis grown in peptone-glucose-yeast extract medium is characterized by the formation of large amounts of lactic acid, a small amount of acetic acid, and traces of acetoin: a corresponding amount of oxygen is taken up. Aerobic metabolism by washed cells of S. lactis and Leuconostoc...