Showing papers by "University of Extremadura published in 1982"
TL;DR: In this paper, the acid-catalysed dehydration of pentahydroxypentyl-heterocycles can take place between C-1′ and C-4′ to yield C -nucleosides having furanoid structures, or between C −1´ and C −5´ to yield pyranoid compounds.
19 citations
16 citations
TL;DR: The characteristics of the mixed-ligand iron(III)-fluoride-purpurin complex, including optimum conditions of formation and extraction into methyl isobutyl ketone are described, and the method is suitable for determining iron in the presence of large amounts of aluminium, cyanide, phosphate and nickel.
12 citations
TL;DR: It is concluded that a rise in the state of reduction of the NAD system is not effective in decreasing hepatic protein synthesis in vivo unless it is accompanied by a decrease in the phosphorylation potential.
11 citations
TL;DR: The ir spectra of calcium-strontium phosphate apatites were studied and the OH, PO4, CO3, and cation-oxygen fundamental frequencies were assigned.
8 citations
TL;DR: In this paper, the 1,8-dihydroxyanthraquinone (1-DHAn) showed a colored and fluorescent reaction with the ion Mg(II) in a hydroalcoholic and ammonical medium.
8 citations
TL;DR: In this article, the florescent characteristics of the complex formed by 1, 5-dihydroxyanthraquinone with Mg(II) in aqueous ethanol (λex 490 nm,λem=600 nm; pHap=9.1-9.6; 10% H2O; reagent concentration=4×10−5M) are described.
Abstract: The florescent characteristics of the complex formed by 1, 5-dihydroxyanthraquinone with Mg(II) in aqueous ethanol (λex 490 nm,λem=600 nm; pHap=9.1-9.6; 10% H2O; reagent concentration=4×10−5M) are described. The stoichiometry and the stability constant (1:1 and log K=4.90) are determined. A new fluorometric method for the determination of 10-100 ppb Mg(II) is proposed.
5 citations
TL;DR: This work has studied the effect of external proton concentration on exponential growth of this yeast on maltose, in batch and continuous cultures.
Abstract: Maltose utilization by S. cerevisiae is mediated by an inducible mechanism which is subject to repression and inactivation by glucose. Recently it has been reported that the active maltose transport in resting yeasts is not ATP dependent, and is coupled to the electrochemical gradient of protons across the yeast plasma membrane; a stoichiometry of one proton per mole of maltose cotransported has been measured. This implies that the external pH should have a great influence on maltose-limited growth of S. cerevisiae. We have studied the effect of external proton concentration on exponential growth of this yeast on maltose, in batch and continuous cultures. (Refs. 10).
5 citations
TL;DR: A simple, sensitive procedure for extractive spectrophotometric determination of nickel has been developed in this paper, where the authors show that at pH 8.5, nickel reacts with purpurin to form a 1:1 red complex, extractable in methyl isobutyl ketone.
4 citations
TL;DR: In this article, the reactions of d -mannose arylhydrazones with dimethyl acetylenedicarboxylate under acidic conditions afforded the respective pentahydroxypentyl pyrazoles.
3 citations
TL;DR: In this paper, the properties and analytical possibilities of 1,4-cyclohexanedione bisthiosemicarbazone as reagent for the spectrophotometric determination of copper have been examined.
TL;DR: In this article, it was shown that the point group of the tetrahedral anions depends on s and unit-cell parameters of Ca 10 - x Sr x (PO 4 ) 6- s (VO 4 ) s (OH) 2, where x = 2, 5, 8 and 1 ⩽ s x and s.
TL;DR: An electronic model of the cardiovascular system using half a heart was designed in which the ventricle is represented by a single time-varying compliance, and a technique was adopted based on Miller's theorem to obtain time variable impedances.
TL;DR: It can be concluded that the effect of glucose in increasing protein synthesis in lung cells is dependent on some signal arising from its breakdown and not to variations in the concentration of reactants or energy charge of the adenylate system.
TL;DR: A biological method is employed, the capacity of Adrianiycin® to inhibit the growth of a strain of Bacillus subtilis, in order to evaluate the hepatic concentrations of the drug administered intravenously and intrasplenically.
Abstract: When the spleen is properly isolated with amniotic membrane and implanted in the extra-abdominal cellular subcutaneous tissue, it may serve as an excellent route for administering drugs selectively to the liver. We have employed a biological method, the capacity of Adrianiycin
®
to inhibit the growth of a strain of
Bacillus subtilis,in order to evaluate the hepatic concentrations of the drug administered intravenously and intrasplenically. At 60 minutes or more after injection, there was an order of magnitude difference in favor of the intrasplenic route.