Showing papers in "Acta Chemica Scandinavica in 1962"
313 citations
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TL;DR: In this article, the chemical degradations necessary to elucidate the structure of prostaglandins E F 1 and F 2 were reported, and it was pointed out that most identifications of these compounds have been nonclassical, i.e., by mass spectrometry of fractions isolated by gas chromatography and comparison of the masspectrograms with synthetic compounds.
Abstract: This short article reports the chemical degradations necessary to elucidate the structure of prostaglandins E F1 and F2 It is pointed out that most identifications of these compounds have been nonclassical ie by mass spectrometry of fractions isolated by gas chromatography and comparison of the masspectrograms with synthetic compounds The 5-step degradation is pictured stereochemically and the procedures are outlined stepwise
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195 citations
TL;DR: In this article, an analysis of metal and slag composition data gathered during the operation of a 6-1/2-ton basic electric-arc furnace is made for the purpose of quantitatively describing the refining processes of dephosphorization and desulfurization.
Abstract: : DESCRIPTORS: (* Steel 4140, 4330, 3 5 4340, 1 4 , Metallurgy, Processing, Purification, Melting, Electric arcs, Solutions, Slags Separation, P PHORUS, Sulphur, Phase studies, Theory. Tables. An analysis of metal and slag composition data gathered during the operation of a 6-1/2-ton basic electric-arc furnace is made for the purpose of quantitatively describing the refining processes of dephosphorization and desulfurization. A kinetic model is proposed, and the data is examined in light of the model; agreement with theory is shown. Relations are obtained correlating metal and slag composition with the rate the refining processes. The results and their ramifications are discussed with reference to the proposed model actual operating procedure, extrapolation, and optimum processing time.
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117 citations
TL;DR: In this article, the solid region of the Fe-P-B system was investigated in the range Fe-FeP2-BP-FeB-Fe by means of x-ray and chemical analyses.
Abstract: : The solid region of the Fe-P-B system was investigated in the range Fe-FeP2-BP-FeB-Fe by means of x-ray and chemical analyses. The main features of an isothermal section at 1000 C have been determined. Boron substitutes for P to a large extent in Fe3P and to a smaller extent in Fe2P and FeP. Two ternary phases exist, Fe5PB2 and Fe3P sub 1-x B sub x, where the phase is homogenous when x ranges between 0.48 and 1. Solid solubility of B is appreciable in Cr3P and Mn3P, but is very restricted in Ni3P. The ternary phase Mn5PB2 is isostructural with Fe5PB2. In the Co-P-B system, 3 ternary phases have been found, Co3P sub 1-x B sub x, Co3P sub 1-y B sub y, and Co5PB2. The crystal structures of Fe3P0.37B0.63 and Fe5PB2 were determined and refined using single-crystal methods. (Author)
113 citations
109 citations
109 citations
TL;DR: In this article, the advantages of both Sephadex gel filtration and thin-layer chromatography can now be utilized with the Superfine gel filter for column electrophoresis and partition chromatography.
Abstract: Sephadex SUPERFINE The advantages of both Sephadex gel filtration and thin-layerchromatographycan now be utilized with the Sephadex Superfine. Sephadex Superfine is an important complement to other analytic methods, particularly where only sample quantities of experimental material are available. It is useful also (1) for determining the optimum conditions for column experiments (2) in place of normal Sephadex in gel filtration columns when very high resolution is required (3) as a supporting medium in column electrophoresis and in partition chromatography.
TL;DR: In this article, the reduction of prostaglandin E (PGE) with sodium borohydride yielded two compounds identical with PGF isolated from the prostate of sheep and the other had different physical and biological properties but the same elementary composition.
Abstract: Reduction of prostaglandin E (PGE) with sodium borohydride yielded 2 compounds 1 of which is identical with PGF isolated from the prostate of sheep and the other of which had different physical and biological properties but the same elementary composition. The former was designated PGF1 and the latter PGF2. Experimental data from mass spectrometry and gas-liquid chromatography analyses indicated that the PGE is an unsaturated dihydroxyketocarboxylic acid and that PGF1 and PGF2 are stereoisomeric unsaturated trihydroxycarboxylic acids. PGE contains 1 carboxyl 1 carbonyl (cyclopentanone) 2 hydroxyls 1 double bond (trans) and 1 ring whereas the PGFs contain 1 carboxyl 3 hydroxyls 1 double bond (trans) and 1 ring. (PGE gives a positive spot on test paper with nitrophenylhydrazine for the presence of a carbonyl whereas the 2 PGFs gave negative tests.)
TL;DR: In this paper, a direct evaluation of the relative partial molar free energy of oxygen in uranium oxide as a function of the O/U atomic ratio and temperature was obtained for galvanic cells involving solid electrolytes.
Abstract: Electromotive force measurements on galvanic cells involving solid electrolytes were made at temperatures of 800 to 1200 deg C in order to obtain standard thermodynamic data for the mixing of UO2and oxygen gas. Due to purely anionic conductivity of the electrolyte, a direct evaluation of the relative partial molar free energy of oxygen in uranium oxide as a function of the O/U atomic ratio and temperature was possible. As a result, values for the partial molar heat and entropy of mixing and the corresponding relative integral quantities were calculated for the whole composition and temperature range investigated. Nonstoichiometry in the homogeneous UO2+xphase is discussed. The solubility of oxygen in this phase was found to be higher than previously known.