Now showing items 221-230 of 233
Studies on the estimation of deoxyribonucleic acid and ribonucleic acid in rat brain
(Elsevier, 1963)
A method for the estimation of DNA and RNA in rat brain is described. The principal modifications of preexisting methods involve initial lipid extraction with chloroform-methanol and continuous stirring during alkaline ...
Activation-analysis of trace cobalt in tissue using 10.5-minute 60m-cobalt
(Elsevier, 1960-01)
Microgram amounts of cobalt from vitamin B12 have been analyzed by rapid activationanalysis in rat kidney tissue as well as in vitamin preparations. A 15-minute radiochemical separation procedure coupled with gamma-ray ...
Histidine transport into isolated animal cells
(Elsevier, 1968-09-03)
At pH values where it is predominantly without net charge, histidine in dilute solution divided its uptake by the Ehrlich cell between the Na+-independent L system and the Na+-requiring A system. As in every other case ...
Addition compounds of methyl substituted cyclic ethers with boron trifluoride
(Elsevier, 1961-04)
A manometric method was used to study the addition compounds of boron trifluoride with 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, 2-methyltetrahydropyran and 2,6-dimethyltetrahydropyran. Physical characteristics ...
Interaction of heat-denatured HeLa cell DNA with synthetic and natural polysaccharides
(Wiley Subscription Services, Inc., A Wiley Company, 1968-11)
Heat-denatured DNA from HeLa cells interacts with natural as well as synthetic polysaccharides. Glucose does not inhibit the interaction nor will it produce it. Polysaccharides with a molecular weight of 10000 or greater ...
Purification of pyridine for voltammetric studies : Effect of impurities
(Elsevier, 1967)
Purification of pyridine by zone fractional crystallization reduces the concentration of prewave-producing contaminant below polarographic detection limits, i.e., 0.01 mM. A qualitative test based on the stability of the ...