Hydrogen peroxide specific heat

Hydrogen peroxide transformed mouse myeloid progenitor cells (FDC-Pl) from interleukin-3 dependence to factor independence, but only at cytotoxic concentrations (> 12/5 pmol/L). Such a transformation was not induced by non-specific insults to the cells, such as sodium fluoride or heat shock treatment. The transformed cells produced tumours when injected into pre-irradiated mice (Crawford Greenberger, 1991). Hydrogen peroxide (10 pmol/L) induced overexpression of the proto-oncogene c-jun in hamster tracheal epithelial (HTE) cells c-jun overexpression led to proliferation and increased growth rate, as well as increased anchorage-independence of HTE cells (Timblin et al., 1995). 

Chemat et al. [14] found the ]oint use of US and microwaves for the treatment of edible oils for the determination of copper to shorten the time taken by this step to about a half that was required in the classical procedure (heating in a Buchi digester) or with microwave assistance, nitric acid and hydrogen peroxide. However, they did not state the specific medium where the microwave-US-assisted method was implemented and assumed US to have mechanical effects only, even though they mentioned a cavitational effect. This is a very common mistake in working with US that is clarified in an extensive discussion by Chanon and Luche [15] of the division of sonochemistry applications into reactions which were the result of true and false effects. Essentially, these terms refer to real chemical effects induced by cavitation and those effects that can be ascribed to the mechanical impact of bubble collapse. The presence of one of these phenomena only has not been demonstrated in the work of Chemat et al. [14] — despite the illustrative figure in their article — so their ascribing the results to purely mechanical effects of US was unwarranted. 

Brown, Barnes, and Maass foimd the mean specific heat of D2O from 4° to 65° to be 1-01, and from 4° to 26°, 1-018. Maass and Hatcher for hydrogen peroxide iH202 at different temperatures found 0-470 to 0-579. 

Determination of manganese levels in soils, sludges, or other solid wastes requires an acid extraction/diges-fion step prior to analysis. The details vary with the specific characteristics of the sample, but usually treatment will involve heating in nitric acid, oxidation with hydrogen peroxide, and filtration and/or centrifugation to remove insoluble matter. 

It can also be olitiiined by treating the metal or the pcutasulphide with hydrogen peroxide or peroxide of sodium. It is a yellowish powder, which changes to black when heated. Its specific density = 5-6. It does not melt and has no taste. 

The test is based on a partly specific oxidation called the mmexide reaction. In the first step of the analysis a few milligrams (or the prescribed quantity) of the substance to be examined are added to 0.1 ml of strong hydrogen peroxide solution R and 0.3 ml of dilute hydrochloric acid R. The mixture is heated to dryness on a water-bath until a yellowish-red residue is obtained. 

The leached chromate solution is heated for 30 min to expel hydrogen peroxide. It is filtered and the filtrate is concentrated in a small volume and neutralized with hydrochloric acid. The formed product is distributed to the users. The specific activity of Cr ranges between 2 x 10 Bq/mg and 4 x 10 Bq/mg. 

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