نتایج جستجو برای: تکنتیوم 99
تعداد نتایج: 72056 فیلتر نتایج به سال:
In another paper [1914] an account will be found of a new method for the estimation of aspartic and glutaminic acids in the hydrolytic products of proteins, depending upon the insolubility of their calcium salts in alcohol. In studying the influence of lime upon glutaminic acid in aqueous solution at higher temperatures it was found that the amino-nitrogen content had been considerably reduced....
-An automated system for the analysis of dissolved organic nitrogen has been developed and applied to natural waters. It is based on subjecting sample to u.v. irradiation followed by a heterogeneous reduction of the nitrogen containing irradiation products to ammonia which is detected by an ammonia gas sensing probe. Quantitative recoveries of different organic nitrogen compounds common to natu...
NEffBOLEPTANAL6ESIA (NLA) has been practiced in Europe since 1959, and today the largest personal series exceed 10,000 cases, z The anaesthetic aims at providing psychomotor sedation while leaving cortical and homeostatic hmctions as intact as possible. ~ At the present time this selective action is achieved by the use of two agents, droperidol and fentanyl. These are given intravenously and ma...
This study examines polybrominated diphenyl ethers (PBDE) levels, trends in biosolids from a wastewater treatment plant, and evaluates potential factors governing PBDE concentrations and the fate in agricultural soils fertilized by biosolids. The mean concentration of the most abundant PBDE congeners in biosolids ( summation operatorBDE-47, BDE-99, and BDE-209) generated by one wastewater treat...
*To whom all correspondence should be addressed. otal organic carbon (TOC) analysis is a fast and effective analytical technique for cleaning validation in pharmaceutical manufacturing. This nonspecific method can be used to test for residues of previously manufactured products, cleaning detergents, chemicals, solvents, by-products, degradants, and microbial contaminants. However, many factors ...
It is a great challenge to substantially improve the practical performance of flexible thermoelectric modules due to the absence of air-stable n-type thermoelectric materials with high-power factor. Here an excellent flexible n-type thermoelectric film is developed, which can be conveniently and rapidly prepared based on the as-grown carbon nanotube continuous networks with high conductivity. T...
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