Biological studies

Rubidium Analysis, Biological Studies and Occurrence," Chemical Abstracts— Chemical Substances Indexes, American Chemical Society, Washington, D.C. 

A. Siddiqui, in G. Papaevangelou and W. Hennersu, eds., Developmental biological Studies of Standardisation in Immunophjlaxis of Infections hy Hepatic Viruses Vol. 54, S. Kaigei, Basel, 1983, p. 19. 

Thromboxane A2 is a potent platelet aggregating agent and vasodilator which undergoes rapid hydrolysis under physiological conditions (ti/2 32 sec. at pH 7 and 37°C). The synthesis of stable analogs was of interest for biological studies of this potent but evanescent prostanoid. 

Two simpler acids were also synthesized for biological studies (Ref. 1) ... 

Synthetic, computer, spectroscopic, and biological studies on new chemotherapeutic 0-heterocycles 98PAC539. 

There is the microtoming optical analysis test. In this procedure thin slices (under 30 tixri) of the plastics are cut from the product at any level and microscopically examined under polarized light transmitted through the sample. Rapid quality and failure analysis examination occurs by this technique. This technique has been used for many years in biological studies and by metallurgists to determine flaws, physical and mechanical properties. Examination can be related to stress patterns, mechanical properties, etc. 

Molecular biology studies have identified a loop containing 20-25 amino acid residues between S5 and S6 (or Ml and M2, Fig. 2) forming the pore. The G(Y/F) G motif located in the pore represents the K+-selectivity signature, which is common to all K+ channels. The external entry to the channel pore and its adjacent residues constitute binding sites for toxins and blockers. The internal vestibule of the pore and the adjacent residues in S5 and S6 contribute to binding sites for compounds such as 4-aminopyiidine and quinidine. The S4-S5 linker lies close to the permeation pathway and is required for... 

Life processes ultimately depend on the transport and reactivity of chemical elements and compounds. Modern biological studies have elegantly unraveled the complicated carbon-based metabolic cycles that are essential to the maintenance of many living things. 

This working model would be the framework for the interpretation of all subsequent biochemical, spectroscopic, and molecular biological studies on this unknown protein. The discovery of a putative [6Fe-6S] protein may have been a surprise to some, but its existence in... 

Fostel J, Choi D, Zwickl C, Morrison N, Rashid A, Hasan A, et al. Chemical Effects in Biological Systems—Data Dictionary (CEBS-DD) a compendium of terms for the capture and integration of biological study design description, conventional phenotypes and omics data. Toxicol Sci 2005 88 585-601. 

C15-0067. Radioactive iodine ( I) is used frequently in biological studies. A radiation biologist studies... 

Extraction procedures must be adjusted when separated anthocyanins will be tested in biological studies. We have found that the types of acids used for anthocyanin extraction as well as their residual concentrations in the final extract may affect the results obtained from biological tests. The growth inhibitory effect of anthocyanins on HT29 (human colonic cancer) cells may be overestimated if the residual acid in the extract exerts a toxic effect on the cells. Acetic acid residues in anthocyanin extracts showed less toxicity to HT29 cells than hydrochloric acid when samples were prepared under the same extraction procedure and subjected to the same tests on HT29 cells. In addition, the procedure to remove acids affected the acid residual concentration as well in final anthocyanin extracts, with lyophilization being more successful than rotary evaporation. 

Pare RM, Clements SA (1991) Intercomparison of enriched stable isotope reference materials for medical and biological studies. NAHRES-5, IAEA, Vienna. 

In contrast to gas phase, organometallic, and biological studies, until recently, relatively few organic systems had been examined by TRIR methods. This chapter will begin with a brief survey of experimental approaches to TRIR spectroscopy and will follow with a discussion of several representative studies of organic reactive intermediates that demonstrate the significant utility of this technique. 

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