Showing papers by "Autonomous University of Barcelona published in 1980"
89 citations
71 citations
TL;DR: In this paper, the most general expression for the WZH vertex which is the most relevant for the production of charged Higgs particles was derived for SU(2) electroweak gauge models with standard fermion assignments.
Abstract: In the framework of SU(2)\ifmmode\times\else\texttimes\fi{}U(1) electroweak gauge models with standard fermion assignments we derive the most general expression for the $\mathrm{WZH}$ vertex which is the most relevant for the production of charged Higgs particles. We show that the vertex only exists with an appreciable strength in models with a rather complicated Higgs sector. Experimental detection of charged Higgs particles seems therefore very difficult.
45 citations
TL;DR: In this paper, the existence of transversal homoclinic points in the collinear three-body problem, restricted and general, and in the planar circular restricted three body problem was proved.
43 citations
TL;DR: The chemical modification of bovine pancreatic ribonuclease A by 6-chloropurine 9-beta-D-ribofuranosyl 5'-monophosphate was studied under several reaction conditions and showed a high degree of specificity in comparison to those corresponding to the base or the nucleoside.
Abstract: The chemical modification of bovine pancreatic ribonuclease A by 6-chloropurine 9-β-d-ribo-furanosyl 5′-monophosphate was studied under several reaction conditions. The reaction, at pH 7.3, 40°C and a nucleotide: enzyme molar ratio of 60, showed a high degree of specificity in comparison to those corresponding to the base or the nucleoside. The main derivative was isolated by means of CM-cellulose chromatography. Subtilisin cleavage of this derivative showed that the substitution had taken place in the S-peptide moiety. Tryptic digestion of the S-peptide indicated that a lysine residue had been modified. Enzymatic and physico-chemical considerations showed that the actual site of reaction was the α-amino group of Lys-1. The structural and kinetic properties of the derivative are consistent with the existence of a phosphate-binding sub-site near the N-terminal region of the enzyme.
41 citations
TL;DR: In this article, a thermodynamic potential that provides a suitable description of the fluctuations of the hydrodynamical dissipative fluxes when it is used in an expression analogous to the classical Einstein formula for the probability of fluctuations is defined.
Abstract: Starting from the generalized Gibbs equation of extended irreversible thermodynamics, we define a thermodynamic potential that provides a suitable description of the fluctuations of the hydrodynamical dissipative fluxes when it is used in an expression analogous to the classical Einstein formula for the probability of fluctuations. In the limit of vanishing relaxation times, our results coincide with those of Landau-Lifshitz. The effect of the rapid normal modes is taken into account as a stochastic noise in the evolution equations of the dissipative fluxes, and their covariance matrix is found from a fluctuation-dissipation theorem.
38 citations
TL;DR: Computed cysternography with metrizamide (CCM) and time control will not only show the relationship between these structures and the arachnoid space but also their dynamic aspect, which may determine the surgical treatment.
Abstract: Intracranial arachnoid cysts do not usually present diagnostic problems when studied by CT, since they appear as low density images similar to those produced by CSF, do not change on intravenous contrast perfusion, and are located extraparenchymatously. Sometimes, however, their diagnosis can become difficult or doubtful mainly in cases of deep, basal or paramedian cysts [12, 18, 22, 24]. on the other hand, the functional or dynamic aspects of these structures remain unkown when the study is limited to simple CT. Computed cysternography with metrizamide (CCM) and time control will not only show the relationship between these structures and the arachnoid space but also their dynamic aspect, which may determine the surgical treatment.
31 citations
TL;DR: Under a variety of catalytic conditions, triacetic acid lactone, I, has been hydrogenated to differently oxidized lactones (II, III and V) and C-Methylation of one of them is the key step for a convenient preparation of the carpenter bee sex pheromone as discussed by the authors.
30 citations
TL;DR: In this article, the δ-meson was interpreted as a q q q Q q q meson rather than an ordinary (q q q ) interpretation, which is consistent with an ordinary q q δ -meson interpretation.
22 citations
TL;DR: In this article, the spermatogenic cells present in ejaculate were identified with a reciprocal translocation and six oligochiasmatic males among 180 patients studied, using this technique, they identified one man with a reciprocally translocated translocation.
Abstract: Meiotic studies can be carried out in the spermatogenic cells present in ejaculate. Using this technique, we identified one man with a reciprocal translocation and six oligochiasmatic males among 180 patients studied. The technique is easy and reliable; good-quality figures can be obtained, and meiotic studies can be carried out as often as needed.
21 citations
TL;DR: The effect of Zn on elasmobranchs and the accumulation of the metal in the gills of the dogfish Scyliorhinus canicula exposed to 180 and 80 ppM of zinc are studied.
Abstract: Besides being an essential element, Zn has been shown to be toxic to aquatic organisms Acute lethalities of Zn salts to teleosts have been reported, but few data regarding Zn toxicity to elasmobranchs can be found To evaluate the effect of Zn on elasmobranchs and to compare the data with those on teleosts this paper studies Zn toxicity and the accumulation of the metal in the gills of the dogfish Scyliorhinus canicula exposed to 180 and 80 ppM of zinc
TL;DR: In centrally organized motor patterns, prolonged cardiac responses (cardiac arrests and bradycardia) are observed and the cardiac response does not habituate in the same experimental conditions used for motion detection.
TL;DR: In this article, the ternary system GeTe-Se was investigated by differential thermal analysis, thermogravimetry, X-ray diffraction and scanning electron microscopy.
TL;DR: There is little evidence, overall, that the mortality has increased, even though hospital admissions have risen steeply, and the subject may be regarded under two main headings; household accidents mainly affecting children under five years of age and deliberate self-poisoning in the older age groups, chiefly due to drugs.
Abstract: In the Western world acute poisoning is one of the most important medicosocial phenomena today and its incidence is increasing. In spite of the interest that the subject has attracted, the problem has been difficult to characterize epidemiologically i n Spain, basically owing to the lack of data and also to the absence of a center sufficiently coordinated and specialized to give sufficient assistance and information on this type of problem. The subject may be regarded under two main headings; household accidents mainly affecting children under five years of age and deliberate self-poisoning in the older age groups, chiefly due to drugs. At the same time, there is little evidence, overall, that the mortality has increased, even though hospital admissions have risen steeply.
TL;DR: The interaction of the fluorescent hydrophobic probe 1-anilinonaphthalene-8-sulfonate with histone oligomers and with hist one H1 has been studied, indicating that the hydrophilic regions of histones Hv to which ANS binds are not located in the N-terminal portions of histone sequences.
TL;DR: Friedel-Crafts benzoylation of styrene -2% DVB copolymer beads yielded insoluble benzoylated polystyrene which was successfully used as sensitizer in the |2+2| photocycloaddition of cyclohexene with maleic anhydride as mentioned in this paper.
TL;DR: A reciprocal translocation in a man, ascertained through the study of meiosis in semen, and a partial trisomy 10q in his abnormal son are described, which are probably due to the presence in triplicate of the region q25→qter of chromosome 10.
Abstract: We describe a reciprocal translocation (10;13) in a man, ascertained through the study of meiosis in semen, and a partial trisomy 10q in his abnormal son. The phenotypic anomalies of the partial 10q trisomy syndrome are probably due to the presence in triplicate of the region q25→qter of chromosome 10.
TL;DR: Starting from the instruction sequencing which can be microprogrammed (segments and loops), a methodology for selecting those requirements which, when converted to microprogram, minimize the execution time for a given size of control memory is developed.
01 Jan 1980
TL;DR: This paper described the Q and G banding patterns of a specimen of Lagothrix lagothricha cana and found some chromosome pairs showBanding patterns identical to those found in some chromosomes of Cebus apella, C. albifrons and Saimin sciureus.
Abstract: Q and G banding studies of the chromosomes of a specimen of Lagothrix lagothricha cana permitted identification of a// pairs in the complement. The X is a medium-sized submetacentric, the Y a very small acrocentric. Some chromosome pairs show banding patterns identical to those found in some chromosomes of Cebus apella, C. albifrons and Saimin sciureus. To our knowledge, no banding studies have been published so far in any of these subspecies. In this paper, we described the Q and G banding patterns of a specimen of Lagothrix lagothricha cana (2n = 62).
TL;DR: The diagnosis of giardiasis was achieved by a peroral small-bowel mucosal biopsy, and all of the abnormal findings were reversed after medical therapy.
Abstract: We present a patient with giardiasis, whose exploratory findings were misleading. The initial symptomatology included diarrhea and weight loss, but the physical examination revealed an abdominal tumor, which could be correlated with a mass image appearing on the small bowel x-ray films. Seroagglutinations for brucellosis, typhoid, and paratyphoid, fever were negative, as well as the search for antiyersinia and anti toxoplasma antibodies. Neither aerobic nor anaerobic pathogens were isolated in blood or stool cultures. Direct microscopic examination of recent fecal smears did not show eggs or parasites. An exploratory laparotomy demonstrated a mesenteric granulomatous lymphadenitis. Finally, the diagnosis of giardiasis was achieved by a peroral small-bowel mucosal biopsy, and all of the abnormal findings were reversed after medical therapy. Some striking features of this case are commented on . mal. Laboratory data were as follows: ESR 65 mm after the first hour, hemoglobin 14 g/dl, RBC 4,200,000/ram 3, WBC 11,700/ram 3 with 2% eosinophils, 15% bands, 61% neutrophils, 21% lymphocytes, and 1% monocytes. Serum glucose, urea, cholesterol, lipids, total proteins, albumin, globulins, iron, and Ca, P, K, Na, and C1 were within normal limits. The serum immunoelectrophoresis revealed normal values for IgG, IgA, and IgM; the PPD at
TL;DR: In this paper, a new model for the transport through membranes, introduced previously by Hosur, is considered, in which the membrane is assimilated to a potential barrier, and the material flow through the membrane can be determined from the transmission coefficient of the barrier, assuming the existence of an energy difference among the molecules placed at both sides of the membrane.
Abstract: In the present paper a new model for the transport through membranes, introduced previously by Hosur, is considered. In this model, the membrane is assimilated to a potential barrier, and the material flow through the membrane is determined from the transmission coefficient of the barrier, assuming the existence of an energy difference among the molecules placed at both sides of the membrane. An equation for the transport, in the case of small energy differences, is obtained, which is particularized to the cases that the energy difference is caused by a temperature gradient, a concentration gradient, and both gradients acting together. In all cases, under certain limitations, formally identical equations to those of the thermodynamics of irreversible processes are obtained.
Dans le present article on considere un nouveau modele pour le transport moleculaire a travers des membranes, qui a ete introduit anterieurement par Hosur. Dans ce modele, la membrane est assimilee a une barriere de potentiel, en determinant le flux materiel a travers de la měme partant des le coefficient de transmission de la barriere, en supposant l'existence d'une difference d'energie parmi les molecules qui appartiennent a les fluides d'une et d'autre cǒte de la membrane. On obtient ainsi, une expression pour le flux dans le cas de petites differences d'energie, qui a ete particularisee au cas ou la difference d'energie est due a un gradient de temperature, un gradient de concentration ou a tous les deux gradients agissant ensemble. Dans tous les cas, sous certaines conditions, on obtient des equations qui sont formellement identiques a celles obtenues par la thermodynamique des processus irreversibles.
In vorliegendem Artikel wird ein von Hosur eingefuhrtes Modell fur Transport durch Membranen untersucht. In diesem Modell wird die Membran mit einer Potentialschwelle assimiliert, und der Materialfluss durch die Membran wird vom Transmissionskoeffizient der Schwelle bestimmt, wobei es wird angenommen, dass ein Energieunterschied unter den Molekulen an den beiden Seiten der Membran existiert. Fur den Fall wo dieser Energieunterschied klein ist wird eine Gleichung fur den Transport erhalten. Diese wird spezialisiert zu den Fallen wo der Energieunterschied von einem Temperatur-oder Konzentrationsgradient oder beiden zusammen verursacht wird. In allen Fallen werden-mit gewissen Begrenzungen-Gleichungen erhalten, die mit denen der Thermodynamik irreversibler Prozesse formal identisch sind.
TL;DR: It is concluded that the conformation of the H4 molecule modifies to some extent the interaction of the C-terminal region, and is important as a determinant factor in the folding of DNA within artificial complexes.
TL;DR: In this paper, a double chair conformation with axial methoxyl groups is established for (1R,2S,4R,5S)-2,4-dimethoxybicyclo[3.3.1]-nonan-9-one on the basis of the J(12), J(2,H-3 exo) and J( 2,3 endo) values and the chemical shifts for H-2(4).
Abstract: A mixture of stereoisomers of 2,4-dimethoxybicyclo[3.3.1]nonan-9-one was prepared, separated by column chromatography and characterized by 60 MHz 1H NMR spectroscopy using Eu(fod)3. A double chair conformation with axial methoxyl groups is established for (1R,2S,4R,5S)-2,4-dimethoxybicyclo[3.3.1]-nonan-9-one on the basis of the J(12), J(2,H-3 exo) and J(2,3 endo) values and the chemical shifts for H-2(4). The conformation of some related compounds is subsequently inferred.