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Showing papers by "National University of La Plata published in 1972"


Journal ArticleDOI
TL;DR: In this paper, an analytic extension of quantum electrodynamics matrix elements as (analytic) functions of the number of dimensions of space (ν) was performed, and the usual divergences appeared as poles forν integer.
Abstract: We perform an analytic extension of quantum electrodynamics matrix elements as (analytic) functions of the number of dimensions of space(ν). The usual divergences appear as poles forν integer. The renormalization of those matrix elements (forν arbitrary) leads to expressions which are free of ultraviolet divergences forν equal to 4. This shows thatν can be used as an analytic regularizing parameter with, advantages over the usual analytic regularization method. In particular, gauge invariance is mantained for anyν.

447 citations


Journal ArticleDOI
TL;DR: In this paper, the lowest order divergent graphs for a scalar ψ 2 φ-coupling theory are computed as functions of the number of dimensions v of the space.

320 citations


Journal ArticleDOI
TL;DR: Four new ir laser bands were discovered and four new stimulated emission lines belonging to the first and second positive systems were obtained and identified as to rotational quantum number.
Abstract: Accurate wavelength measurements in the molecular nitrogen pulsed laser have been made. Four new ir laser bands were discovered. In addition, about two hundred new stimulated emission lines belonging to the first and second positive systems were obtained and identified as to rotational quantum number. An analysis of the possible pumping mechanisms in accordance with experimental results is given.

39 citations


Journal ArticleDOI
TL;DR: In this article, the electrochemical behavior of iron anodes in molten alkali nitrates has been investigated at temperatures ranging from ca 240-320°C, and the E/I curves exhibit a potential region where the electrode passivates.

25 citations


Journal ArticleDOI
TL;DR: In this paper, the kinetics of the electrochemical oxidation of NO2− ion dissolved in DMSO has been studied on Pt electrodes at temperature ranging from 25 to 44°C, by means of potentiostatic E/I curves and by relaxation techniques.

23 citations


Journal ArticleDOI
01 Jun 1972-Lipids
TL;DR: The results support the hypothesis that a protein diet increases specifically the desaturating activity of the microsomes.
Abstract: The desaturation of14C-1-linoleic acid to γ-linolenic acid and their incorporation into the microsomal lipids of rats fed on a balanced diet and a protein diet were measured in vitro. It was shown that a protein diet does not change significantly the distribution of the radioactivity among the different lipidic fractions compared to the animals fed on a balanced diet. However the microsomal desaturation of linoleic acid to γ-linolenic acid increased in the rats maintained on a protein diet. Besides, the amount and composition of the free fatty acids present in the microsomes of the animals fed on both diets were similar enough to discard the hypothesis that they may modify the desaturation of linoleic acid produced by the diet. The enzymic activity of the linoleyl desaturase of liver microsomes of animals fed on a protein diet, measured in substrate saturating conditions, is greater than in animals with balanced diet. Consequently the results support the hypothesis that a protein diet increases specifically the desaturating activity of the microsomes.

22 citations



Journal ArticleDOI
TL;DR: In this article, die Infrarot-and Laser-Raman-Festkorperspektren von Sr 3 (VO 4 ) 2 und Ba 3 (V4 ) 2 aufgenommen und an Hand einer Site-Symmetrie-und Faktorgruppenanalyse interpretiert.

19 citations


Journal ArticleDOI
TL;DR: In this article, potential/pO 2− diagrams have been developed for the iron/molten-sodium-nitrate system at 600 and 700°K, and four well defined regions corresponding respectively to metal corrosion, immunity, passivity and passivity breakdown are shown in the diagrams.

18 citations


Journal ArticleDOI
TL;DR: In this paper, potential/pO2− diagrams have been developed for iron, cobalt and nickel in molten sodium nitrite at 600 and 700°K, and four well defined regions corresponding respectively to metal corrosion, immunity, passivity and passivity breakdown are determined in the diagrams.

18 citations


Journal ArticleDOI
TL;DR: In this article, the kinetics and mechanism of the anodic film formation and its cathodic dissolution on platinum, through electrolysis of molten potassium thiocyanate, were studied.

Journal ArticleDOI
TL;DR: In this article, the SCN − /(SCN) 2 system was studied on platinum in the temperature range from −12 to −3°C at different ammonium thiocyanate concentrations in acetonitrile in the presence of 0·1 M [(C 2 H 5 ) 4 N]ClO 4.

Journal ArticleDOI
TL;DR: In this article, the kinetics of the photochemical O 3 decomposition at 3340 A have been investigated in a static system at −12 and 25°C, where the O 3 pressure was varied between 50 and 300 torr, the O 2 pressure between 0.3 and 500 torr.


Journal ArticleDOI
TL;DR: In this article, the anodic oxidation of SCN − ion dissolved as KSCN in dimethylsulphoxide, on platinum electrodes, was investigated at ca 25, 60 and 160°C by means of various non-stationary electrochemical techniques.

Journal ArticleDOI
TL;DR: In this paper, the electrochemical reduction on gold of NO2+ dissolved in concentrated H2SO4 has been studied by means of the rotating disk electrode and cyclic voltammetry, over a wide range of experimental conditions.

Journal ArticleDOI
TL;DR: In this article, the passivation of nickel in molten alkaline nitrites and the electrochemical dissolution of passive nickel have been studied at temperatures ranging from 234-306°C. The passivation potential is established both in the potentiostatic E/I curves and in the galvanostatic anodic potential build-up.

Journal ArticleDOI
TL;DR: In this paper, the thermal decomposition of F 2 O has been investigated in reactors of Mg, Al and quartz using a static method, where the temperature was varied between 501 and 583°K and the total pressure between 10 and 750 torr.

Journal ArticleDOI
TL;DR: In this article, the electrochemical reduction of NO+ ion in concentrated sulphuric acid has been studied on gold and platinum electrodes in the temperature range from 4·5 to 55·5°C with the rotating disk electrode, linear potential-sweep voltammetry and chronopotentiometry.

Journal ArticleDOI
TL;DR: It is suggested that the changes observed in the beta cell secretory response could be the main factor responsible for the circadian rhythm in serum IRI levels.
Abstract: Serum IRI levels and insulin release in vitro were studied in normal mice during a 24–hr period. It was observed that both parameters present a clear circadian rhythm with a coincidence in the location of their highest and lowest values. These values rose from the 00–hr to the 20–hr time—points. On the basis of the coincidence of these rhythms we suggest that the changes observed in the beta cell secretory response could be the main factor responsible for the circadian rhythm in serum IRI levels.(Endocrinology 91: 738, 1972)

Journal ArticleDOI
TL;DR: In this article, the (d, 2n) reaction with deuterons on natural zirconium and 90Zr targets has been measured radiochemically with the stacked foil technique between ≈9 and 27 MeV.
Abstract: Excitation functions for reactions induced by deuterons on natural zirconium and90Zr targets have been measured radiochemically with the stacked foil technique between ≈9 and 27 MeV. The observed reactions are Zr(d,xn)90 Nb, Zr(d,axn)88Y,90Zr(d, 2n)90Nb and90Zr(d, α)88Y. The excitation functions for the reactions91Zr(d, 3n)90Nb and91Zr(d, αn)88Y have been deduced from the results mentioned above. Calculations of the excitation function for the (d, 2n) reaction have been performed with two different treatments, each one taking into account two competitive mechanisms. The compound-statistical model plus Hittmair's stripping theory accounts quite well for the (d, 2n) cross sections observed. However, the agreement obtained with Peaslee-Otozai's theory is excellent and the set of parameters used more reasonable. It has been assumed that the stripping mechanism can have no contribution to the (d, α) reaction. Accordingly, calculations for this reaction have been done using the compound-statistical model and the entire absorption process followed by the evaporation of an α particle. No good agreement is obtained with either theory.

Journal ArticleDOI
TL;DR: In this article, the convergence of the lowes t -order diferients of the Higgs-Kibb-Leibler model is studied. But the convergence is not discussed.
Abstract: In 1967 WEINBERG (1) proposed an unif ied theory of e lec t romagne t ic and weak in te rac t ions of lep tons and suggested t h a t t he t heo ry migh t be renormal izable . Recen t deve lopmen t s give s t rong suppor t to this con jec tu re (~). More r ecen t ly WEINBERG (3) emphas ized t h a t his original mode l is one of a l a rge class of gauge theories in which the gauge s y m m e t r y is spontaneous ly broken. T h e Higgs -Kibb le (4) mechan ism allows then the e l iminat ion of the associated Goldstone bosons and gives rise to the masses of t he bosons and leptons. L a t e l y a number of theories of this class have been proposed (6). I n th is no te we discuss t he convergence proper t ies of the lowes t -order d iagrams cont r ibu t ing to the phys ica l pho ton-pho ton sca t te r ing ampl i tude in the gauge theories . This calcula t ion is in te res t ing for the fol lowing reasons:

Journal ArticleDOI
TL;DR: Kinetin provoked the formation of buds on the roots of entire plants of Passiflora caerulea and auxins antagonized this effect and Photoperiod did not affected the response to the cytokinin.

Journal ArticleDOI
TL;DR: Significant fluctuations of blood glucose during the first and second 24‐hr periods after hepatectomy, were observed, and the phase relationships between the described variations in blood glucose and the animal's feeding patterns are discussed.
Abstract: A circadian rhythm in blood glucose of normal, intact, standardized male mice is reported. Significant fluctuations of blood glucose during the first and second 24‐hr periods after hepatectomy, were observed. These fluctuations were not synchro‐nized with the normal rhythm and take place around overall 24‐hr average which is much lower than the one observed in normal mice. The phase relationships between the described variations in blood glucose and the animal's feeding patterns are discussed.

Journal ArticleDOI
TL;DR: In this paper, the electrochemical evolution and dissolution of hydrogen in potassium bisulphate melt have been studied on porous graphite electrodes in the temperature range from 245-280°C.


Journal ArticleDOI
TL;DR: In this paper, the structure of low-lying levels in odd-mass gallium isotopes is investigated within the framework of the semimicroscopic model, assuming three protons coupled to a quadrupole vibrator.
Abstract: The structure of the low-lying levels in odd-mass gallium isotopes is investigated within the framework of the semimicroscopic model, assuming three protons coupled to a quadrupole vibrator. A detailed comparison with experiments is performed for $^{69}\mathrm{Ga}$.

Journal ArticleDOI
TL;DR: In this paper, the ionic mass transfer at rotating electrodes formed by a one-base spherical segment has been experimentally studied by the usual electrochemical methods, and the mass transfer rate equation is defined for electrodes which involve an electrochemical active area having angle up to 40 degrees.

Journal ArticleDOI
TL;DR: In this paper, the effects induced by applying the schematic model, within the framework of the quasiparticle random phase approximation, to the description of collective vibrational states in deformed heavy nuclei are discussed.

Journal ArticleDOI
TL;DR: In this paper, the absorption of a single gas into a liquid film, flowing in a stable laminar regime under the effect of a shear stress produced by the gas stream, is studied.