Showing papers by "University of Seville published in 1986"
TL;DR: The results show the existence of at least three groups with the taxonomic level of genus Halobacterium, and propose the two new genera Haloarcula and Haloferax for the nomenclatural accomodation of the three groups.
298 citations
TL;DR: Abducens motoneurons showed considerable variability in frequency during repeated fixations of the same eye position, and discharge rates were found to depend upon both the direction of the previous eye movement and, more importantly, the animal's level of alertness.
148 citations
TL;DR: Two strains, Y27 and MA2.38, representatives of the two most distinct new groups of Halobacteria were studied in detail, and two new species are proposed.
126 citations
TL;DR: In this article, it has been shown that the activation energy of a solid state reaction can be determined by Kissinger's method whatever the reaction mechanism, provided that E/RT > 10.
Abstract: It has been demonstrated that the activation energy of a solid state reaction can be determined by Kissinger's method whatever the reaction mechanism. On the other hand the influence of both the kinetic law obeyed by the reaction and the values of E/RT on the error in the activation energy determined from Kissinger's method has been analyzed. It has been shown that whatever the reaction mechanism this error is lower than 5%, provided that E/RT > 10.
97 citations
TL;DR: The activity of 43 antidromically identified abducens internuclear neurons with conduction velocities ranging from 14 to 54 m/s was analyzed in alert cats during spontaneous and vestibular induced eye movements and discharge rates were found to depend upon both the direction of the preceding eye movement and the animal's level of alertness.
96 citations
TL;DR: In this paper, the crystal structure of the α-amino acid glycine was determined and the anions were used to obtain the corresponding nickel(II) complexes in acid form, which are diamagnetic and coordination takes place in a near-square planar geometry around the Ni (II) ion through the sulphur atoms of the dithiocarbamate moiety.
65 citations
TL;DR: Receptors for vasoactive intestinal peptide (VIP) have been characterized in rat lymphoid cells and the interaction of [125I] VIP with blood mononuclear cells was rapid, reversible, specific and saturable.
62 citations
TL;DR: In this paper, the boundary value problem for the nonlinear Boltzmann equation is related to the stochastic, Lees-Edwards, and non-Newtonian dynamics methods.
Abstract: Several methods for nonequilibrium computer simulation of plane Couette flow are analyzed by kinetic theory The boundary-value problem for the nonlinear Boltzmann equation is related to the stochastic, Lees-Edwards, and ``non-Newtonian'' dynamics methods It is found that the kinetic-theory and computer simulation methods can be put into close correspondence, except for one form of the non-Newtonian equations of motion The effects of homogeneous, nonconservative forces used to maintain constant temperature are also studied For a special interatomic force law exact scaling relations are obtained to relate isothermal and nonisothermal solutions to the Boltzmann equation For other force laws this scaling relationship is only approximate
57 citations
55 citations
TL;DR: The quantitative results suggest that Gibberella lacks a feed-back regulation of carotenogenesis similar to the one found in Phycomyces, e.g. HCl, nicotine, imidazole, dimethylphthalate, veratrol and cinnamic alcohol.
46 citations
TL;DR: In this paper, a general method for the synthesis of pyrimidine C -nucleosides involves a one-step reaction of aldohexoses and aldopentoses with barbituric acids.
TL;DR: 21 selected monogenic ethanol-sensitive mutants define 20 complementation groups, denominated ETA1 to ETA20, which indicates that there is a high number of genes involved in the ethanol tolerance/sensitivity mechanism.
Abstract: Saccharomyces cerevisiae mutants unable to grow at ethanol concentrations at which the wild type strain S288C does grow, have been isolated. Some of them show additional phenotypic alterations in colony size, temperature sensitivity and viability in ethanol, which cosegregate with the growth sensitivity in ethanol. 21 selected monogenic ethanol-sensitive mutants define 20 complementation groups, denominated ETA1 to ETA20, which indicates that there is a high number of genes involved in the ethanol tolerance/sensitivity mechanism.
TL;DR: In this article, a consistent solution of the Bhatnagar-Gross-Krook (BGK) model kinetic equation describing a system in a steady state with constant pressure and nonuniform temperature was constructed.
Abstract: We construct a consistent solution of the Bhatnagar-Gross-Krook (BGK) model kinetic equation describing a system in a steady state with constant pressure and nonuniform temperature. The thermal profile is not linear and depends on the interaction potential. All the moments of the distribution function are given as polynomials in the local thermal gradient. In particular, the heat flux always obeys the (linear) Fourier law.
TL;DR: By using 3 different methods for the detection of antagonism, complex patterns of this type of interaction were evident within a group comprising 79 halobacterial strains, which included the most divergent types of culture collection strains available, as well as freshly isolated ones.
Abstract: By using 3 different methods for the detection of antagonism, complex patterns of this type of interaction were evident within a group comprising 79 halobacterial strains, which included the most divergent types of culture collection strains available, as well as freshly isolated ones. The experiments carried out showed that such interactions are not due to phages, but to the effects of bacteriocin-like substances, known as halocins. With the exception of only 2 strains, all the remainder caused inhibition to a greater or lesser degree, showing a wide variety of activity spectra. Comparative numerical analysis of these spectra revealed the existence of at least 15 different groups of halocins.
TL;DR: Evidence is presented for the first time on the occurrence of megaplasmids in halobacterial strains from widely differing geographical areas by agarose gel electrophoresis.
Abstract: Sixty-five halobacteria, including culture collection and freshly isolated strains from widely differing geographical areas, were examined for the presence of high molecular weight plasmids by agarose gel electrophoresis. Seventy-five per cent of all the strains were shown to harbour at least one plasmid. In the majority of strains three or four megaplasmids were detected. Approximate molecular weights of the plasmids were in the range < 100 to 300 megadaltons (Mdal). In most culture collection strains, two or three plasmids were demonstrated, except in two in which no plasmid was detected, and in two Haloarcula strains which were found to contain five and eight plasmids; four and six of the latter were more than 100 Mdal. No relationship between the plasmid profile of each strain and its taxonomic assignation nor its isolation source was found. Evidence is presented for the first time on the occurrence of megaplasmids in halobacteria.
TL;DR: This enzyme may catalyze the ferredoxin-dependent reduction of 2-oxoglutarate, in the absence of glutamine, as well as the synthesis of glutamate through the formation of an enzyme-bound free radical of flavin semiquinone.
TL;DR: Administration orale de 10, 20, 40 et 60 mg/100 g de poids d'atrazine a des rats pendant 14 jours and examen des taux de sodium, potassium et chlorures dans l'urine, et aussi des tau de creatinine et d'albumine.
Abstract: Administration orale de 10, 20, 40 et 60 mg/100 g de poids d'atrazine a des rats pendant 14 jours et examen des taux de sodium, potassium et chlorures dans l'urine, et aussi des taux de creatinine et d'albumine. Examen de l'activite de la lactate deshydrogenase et de l'α-hydroxybutyrate deshydrogenase dans le serum. Analyse des effets nephrotoxiques de l'atrazine
TL;DR: The role of host defense factors in neonates and the possible significance of bacterial surface characteristics in the pathogenesis of catheter-associated infections are examined.
TL;DR: The changes in the content of the biogenic amines and their metabolites in the striatum of the rat during the aging period (3-30 months) have been studied and suggest a slight increase in DA metabolism.
TL;DR: The results support the view that, in green tissues, the reducing equivalents photogenerated in the chloroplasts are more directly used for NO - 2 reduction than for NO- 2 reduction.
TL;DR: Electron microscopic observations during the encystment of Histriculus similis confirmed that the cyst wall, composed of four layers, is derived from different kinds of precursors which are synthesized de novo.
Journal Article•
TL;DR: In this paper, a gas-flow proportional counter was used to measure the actinide α emission from rain water and drinking water samples, and the isotopic Ra composition was obtained by measuring at two or three different times the α activity from the Ra fraction.
TL;DR: There was a decrease in the thickness of the aged retina compared to that of the controls and an increase in Golgi apparatus, however, not at a uniform rate but to different degrees in the different cells.
TL;DR: A microcomputer-controlled circuit for generation of linear analog waveforms for use in electrochemical experiments is proposed, which uses an inexpensive 8-bit D/A converter, and is adaptable to microcomputers with parallel I/O interface.
TL;DR: The Rhizobium trifolii symbiotic plasmid pRt5a was transferred to the fast-growing soybean strain USDA 194 but transconjugants carrying pRT5a were not able to nodulate clovers and one of the transcon jugants had lost its smallest resident plasmids and did not fix nitrogen in soybean.
Abstract: The Rhizobium trifolii symbiotic plasmid pRt5a was transferred to the fast-growing soybean strain USDA 194. Transconjugants carrying pRt5a were not able to nodulate clovers and one of the transconjugants had lost its smallest resident plasmid and did not fix nitrogen in soybean. Transconjugants of USDA 194 carrying pRt5a were able to transfer pRt5a back to a non-nodulating R. trifolii which inherited the symbiotic properties of the R. trifolii strain from which the plasmid was derived.
TL;DR: The results indicate that an increase in NADPH consumption induces the synthesis of malic enzyme, and a protection of enzyme degradation cannot be rigorously excluded.
TL;DR: In this paper, 1,3,4,6-tetra O -acetyl-2]-3-alkyl(aryl)-thioureido]-2-deoxy-α-d -glucopyranoses were converted in high yield into O -deacetylated thiazoline hydrobromide by hydrogen bromide-promoted cyclisation.
TL;DR: P pH graphs of polybasic acids are derived, and new graphical and numerical techniques for evaluating the acidity constants of two-step overlapping equilibria are examined.