منابع مشابه
Separation of porphyrins by counter-current distribution.
The recent development by Craig (l-3) of an all-glass machine for liquidliquid counter-current fractionation makes possible the application of his method to the separation of porphyrins which cannot readily be separated by the sensitive Willstatter “HCl number” method. In this paper we have studied the application of the Craig method to the separation of a mixture of three known porphyrins, usi...
متن کاملRapid estimation of theoretical counter-current distribution values.
The usefulness of the Craig counter-current distribution technique (1, 2) for studying the purity of compounds and the metabolic fate of therapeutic agents can be augmented by deriving the theoretical distribution values from the “Tables of the binomial probability distribution” (3). By use of such tables, which only recently have become generally available, laborious calculation of theoretical...
متن کاملCounter-current distribution studies on streptomycin; the tautomerism of streptomycin.
The simplicity and reproducibility which characterize the conversion of streptomycin to malt01 (1) by heating in dilute alkali have made this reaction the basis of a frequently used analytical method for streptomycin (2). When used in these laboratories as a method of assaying streptomycin preparations, however, the malt01 reaction consistently gave lower yields per unit of potency with pure st...
متن کاملDephosphorylation of nucleotides; their analysis by counter-current distribution.
The analysis for the pyrimidine c0nstituent.s of ribonucleic acids has long been a difficult problem, because of the stability of the ribosidic and phosphoryl bonds of the pyrimidine nucleotides. The nucleotides are very soluble in water and are difficult to separate. There have been several attempts in recent years to overcome the difficulties. Loring, Ordway, and Pierce (1) used ammonia at 14...
متن کاملFractal counter-current exchange networks
We construct a general analysis for counter-current exchange devices, linking their efficiency to the (potentially fractal) geometry of the exchange surface and supply network. For certain parameter ranges, we show that the optimal exchanger consists of densely packed pipes which span a thin sheet of large area, which may be crumpled into a fractal surface and supplied with a fractal network of...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1948
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(19)52773-9