Chronic exposure to propylene does not result in any increased incidence of tumors, yet does increase N7-hydroxypropylguanine (N7-HPGua) adducts in tissue DNA. To investigate any potential for genotoxicity (mutagenicity or clastogenicity), male F344 rats were exposed via inhalation to up to 10,000 ppm propylene for 1, 3, or 20 days (6 h/day, 5 days/week). The endpoints examined included gene (H...

Propylene and acetylene are released to mine air with the increase in the temperature of self-heating coal. Concentrations of these gases in mine air are applied as indicators of the progress of the self-heating process. Hydrocarbons emitted from the self-ignition center are sorbed on coal, while migrating through the mine workings. Coal crushed during the mining process is characterized by a h...

Propylene is an important chemical intermediate in the chemical industry, which is conventionally produced either as a co-product to ethylene in steam crackers or byproductin refineries. With the increase in exploration of shale gas, new cracker projects for ethyleneproduction are based primarily on ethane feedstock, which yield almost no propylene [1,2] Onthe other hand, the demand...

frothers havea profoundeffectonbubble size and also flotation efficiency. in present study the effect of type and dosage of frothers on the flotation response of coarse particles of quartz was investigated.  therefore, flotation response of coarse particles using frothers such as mibc, pine oil, poly propylene glycol with concentration of 0, 25, 50 and 75 g/t, was obtained respectively. for all...

Abstract In the present work, 4-methylcatechol oligomer has been prepared by using enzyme-catalyzed polymerization in water and preliminary evaluations as stabilizing agent polypropylene (PP) was performed. comparison with intrinsic PP, oxidation onset temperature of oligomer/PP composite increased 66°C, induction time 40 min. addition, mixing a PP (i.e., formation composite) did significantly ...

Microtubule protein purified from porcine brain was fixed at low protein concentration with glutaraldehyde under conditions which maximize the relative concentration of the ring-shaped 30 S oligomer. Fixed oligomer was separated from glutaraldehyde and other protein species by column chromatography. The fixed, isolated oligomer was deposited on electron microscopy grids, dehydrated, and then cr...

A novel and facile synthetic method for h-BN films from borazine oligomer (B3N3H4)x precursors has been developed. This method only includes spin-coating of borazine oligomer onto nickel catalysts and a subsequent annealing step. Large areal and highly crystalline h-BN films were obtained. The stoichiometric B/N ratio of borazine oligomer precursor was preserved in the final h-BN product such t...