Showing papers by "State University of Campinas published in 1975"
TL;DR: A review of the 17 published cases of intramedullary cysticercosis showed this condition to be clinically indistinguishable from spinal cord tumours, and no evidence for an ependymal route of spread could be adduced.
90 citations
TL;DR: The pulmonary veins of albino Wistar rats were studied by means of light and electron microscopy to reveal striking differences in the ultrastructure of media muscle fibers similar to that of rat hearts.
Abstract: The pulmonary veins of albino Wistar rats were studied by means of light and electron microscopy. The media of larger veins consists of cardiac muscle fibers which extend until the vessels attain about 100 mu in diameter. This coat consists of external longitudinal fibers and internal circular fibers. The vasa vasorum are well developed and the capillaries show pseudofenestrations. The numerous adrenergic and cholinergic nerve endings do not form typical motor end-plates as seen in skeletal muscles. The ultrastructure of these media muscle fibers is similar to that of the rat hearts. The smooth muscle layer of larger pulmonary veins is not continuous as it is in smaller veins where it forms cushions. Comparison of albino rats and other rodents reveal striking differences. Action potential shape and propagation velocity (0.5-1.2 m/s) along the myocardial coat of the pulmonary vein were similar to those observed in the left atrium and so was their sensitivity to locally applied acetylcholine. The physiological direction of propagation in rat pulmonary veins is toward the lung. This fingind lends support to the hypothesis of a rhythmic, valve-like action of the striated musculature of the pulmonary venous wall during the systole and a possible role in the capacitance of the pulmonary circulation.
88 citations
15 Dec 1975
TL;DR: In this article, a theory for the mixed valence state of rare-earth compounds is presented, which includes two types of electronic states-localized, highly correlated states and itinerant, non-correlated states.
Abstract: A theory for the mixed valence state of rare-earth compounds is presented. It includes the following features: (1) two types of electronic states-localized, highly correlated states and itinerant, non-correlated states; (2) a very strong Coulomb repulsion between localized states in the same site; (3) a Coulomb interaction between localized and itinerant states which drives the phase transition; and (4) hybridization between localized and itinerant states which produces the mixed valence state. It is shown that this model produces (a) at T = 0, a variation in the number of localized electrons which may vary in a smooth or in a discontinuous fashion as a function of pressure or alloying; (b) transitions at finite temperature which terminate in a classical critical point. Qualitative agreement with experiment is an encouraging feature of the model.
86 citations
TL;DR: Polyacrylamide-gel electrophoresis revealed 9 polyphenol oxidase (PPO) isoenzymes in the interior of banana pulp, 8 in the exterior pulp, and 10 in the peel.
71 citations
32 citations
26 citations
01 Jul 1975
TL;DR: In this article, the authors proposed a frequency-selective feedback mechanism for self-induced optical pulsing in CW junction lasers, which is achieved by optically coupling a diffraction grating to a laser mirror.
Abstract: Suppression of the self-induced intensity pulsations from CW junction lasers has been achieved by operating the laser with frequency-selective optical feedback. The feedback is achieved by optically coupling a diffraction grating to a laser mirror. The feedback suppresses all longitudinal modes except one or two and thereby eliminates the mode interactions necessary for sustained optical pulsing. The experimental results directly support the previously proposed model for self-induced optical pulsing in semiconductor lasers.
24 citations
TL;DR: Sitosterol and the following terpenic compounds have been isolated from the bark of Podocarpus lambertius: 3β-hydroxytotarol, 4β-carboxynortol, and macrophyllic and lambertic acids as mentioned in this paper.
23 citations
TL;DR: In this paper, the protein solubility of defatted sesame seed meal in aqueous solution over various pHs or in various salt solutions was investigated, and the protein was almost insoluble at acid solution.
Abstract: Sesame seeds are an important source of edible oil and protein. Studies were made on protein solubility of defatted sesame seed meal in aqueous solution over various pHs or in various salt solutions. Maximum solubility was found in alkaline solution, and the proteins were almost insoluble at acid solution. The solubility of protein in NaCl or CaCl2 solution was increased upon increasing the salt concentrations up to 1 M. In Na2SO3 or Na2HPO4 solution, the solubility of protein was higher at lower salt concentrations but decreased at higher salt concentrations at pH 8. Extractable sesame seed proteins in salt solution separated into seven fractions electrophoretically (sodium dodecyl sulfate-polyacrylamide gel electrophoresis). The mol wt of the seven fractions were 51,000, 31,000, 28,500, 25,500, 21,800, 20,500, and 17,900.
22 citations
TL;DR: In this article, a complete set of basis functions for the expansion of the wave function of a Bloch electron in a uniform magnetic field is derived, and in the empty lattice limit this set gives the appropriate Landau free-electron wavefunctions, contrary to the Roth functions which in that limit are plane waves.
20 citations
TL;DR: In this paper, the Nd : Yag laser radiation itself was used as a probe to search for population changes of optical phonons and carriers by means of Raman scattering.
TL;DR: The polvilho azedo, a fermented cassava starch that is obtained by a rudimentary and empirical process, was investigated in this paper, where it was found to be more soluble and easily swells in water, and when its aqueous suspension is heated, the paste formed is less viscous than that of the non-fermented cassava.
Abstract: This work intended to give some contribution to the study of the “polvilho azedo”, a fermented cassava starch that is obtained by a rudimentary and empirical process, and to make it better known. A comparative study showed that in addition to giving the characteristic flavor to the cassava starch, the fermentation causes some changes on its physico-chemical properties: The fermented starch is more soluble and easily swells in water, and when its aqueous suspension is heated, the paste formed is less viscous than that of the non-fermented cassava starch.
TL;DR: Bacterial counts of beef carcasses by the cotton swab technique and by the new method showed that the latter gave higher counts, indicating its simplicity, rapidity, and adaptability to routine use on any type of carcass.
Abstract: A new method for sampling meat surfaces was developed. Bacterial counts of beef carcasses by the cotton swab technique and by the new method showed that the latter gave higher counts. These counts were closely correlated with data obtained by using the swab method. Advantages of the new method are its simplicity, rapidity, and adaptability to routine use on any type of carcass.
TL;DR: Foi estudada a acao patogenica das linhagens de Schistosoma mansoni dos municipios de Belo Horizonte, MG e de Sao Jose dos Campos, SP observando maior capacidade patogenic da linhags do primeiro, nas condicoes da experience.
Abstract: Foi estudada a acao patogenica das linhagens de Schistosoma mansoni dos municipios de Belo Horizonte, MG e de Sao Jose dos Campos, SP (Brasil) observando maior capacidade patogenica da linhagem do primeiro, nas condicoes da experiencia.
TL;DR: In this paper, it was found that the shift towards lower energies of the emission peak is mainly due to induced high carrier density and that the broadening is related to the presence of high densities of optical phonons and hot carriers.
TL;DR: In this paper, light scattering from non-equilibrium single-particle electron excitations in direct gap n -doped semiconductors is considered and it is shown that deviations from the Maxwellian profile of the scattering spectrum of hot electrons can be accounted for by exchange and correlation effects.
TL;DR: In this article, the macroscopic magnetization was introduced to treat the localized magnetic moments in a magnetic semiconductor, and a set of coupled equations for the magnetization and the electronic wavefunction of a shallow donor impurity exchange coupled to the localized moments were obtained.
TL;DR: In this paper, the stability of toroidal diffuse pinches with the shape of the cross-section resembling a normal or inverted D was studied for a bell-shaped current density profile, and the ideal MHD-equilibrium was described by using the Herrnegger-Maschke solutions of the equilibrium equations.
Abstract: Stability against flute modes. localized inside the plasma column, of magnetic confinement configurations which are relevant for the realization of poloidal divertors, is studied for a bell-shaped current-density profile. The ideal MHD-equilibrium is described by using the Herrnegger-Maschke solutions of the equilibrium equations. It is shown that there is little difference between the stability conditions for toroidal diffuse pinches with the shape of the cross-section resembling a normal or inverted D, and that these two shapes of the plasma cross-section are preferable to a rectangular one if the plasma column is very elongated in the vertical direction. A comparison is made with the results based upon a flat-current-density equilibrium model.
TL;DR: In this article, the conditions to attain high sensitivity and precision in the measurement of the ratio γ of the wavelength to the cubic crystal parameter a, by the multiple scattering method are discussed.
Abstract: a) The conditions to attain high sensitivity and precision in the measurement of the ratio γ of the wavelength to the cubic crystal parameter a, by the multiple scattering method are discussed. b) The width of the interaction peaks and a relationship between the peak width and the uncertainty in γ, are obtained theoretically. c) The formulas thus obtained are analyzed in an attempt to optimize the experiment. d) From this study, the possibility arises of performing "divergence-free" experiments, where the contributions of the beam divergence and of mosaic spread to the width of the peak, and then to the uncertainty in γ, cancel out. A comparison between experimental values and those predicted by the theory shows a reasonably good agreement which can be considered as an initial confirmation of the theory.
TL;DR: In this paper, CNDO molecular orbital calculations have been performed to analyze donor-acceptor interactions between molecular chlorine and benzene, toluene, mesitylene and hexamethylbenzene and the, as yet, unreported chlorine-hexafluorobenzene-chlorine pairs.
TL;DR: In this paper, a random stress model with possible local tetragonal distortions was used to analyze the ESR linewidth at the X band frequency in LaSb single crystal.
TL;DR: The temperature dependence of the mobility of positive ions in 3He at a pressure of 60 Torr has been studied from 0.7 to <0.08 K; an unusually sharp peak is observed at approximately 0.2 K.
Abstract: The temperature dependence of the mobility of positive ions in 3He at a pressure of 60 Torr has been studied from 0.7 to <0.08 K; an unusually sharp peak is observed at approximately 0.2 K.
TL;DR: The first observation of Raman scattering from the upper branch polariton in a semiconductor was reported in this paper, where the significant reduction in collecting solid angle is the main cause that allows for this observation.
TL;DR: A case of hereditary multiple exostoses successfully operated in a 15 year-old white brazilian boy admitted with tetraplegia and Babinski's sign.
Abstract: A case of hereditary multiple exostoses successfully operated is reported. The patient, a 15 year-old white brazilian boy, was admitted with tetraplegia and Babinski's sign. Early diagnosis followed by prompt surgery may prevent permanent spinal cord damage.
TL;DR: By immersing the point-ion h.c.p. lattice into a free-electron gas and calculating the electron-ion interaction in the extended de Launay model, the lattice dynamics of five metals, namely that of scandium, terbium, holmium, thallium and zirconium, are studied in this paper.
Abstract: By immersing the point-ion h.c.p. lattice into a free-electron gas and calculating the electron-ion interaction in the extended de Launay model, the lattice dynamics of five metals, namely that of scandium, terbium, holmium, thallium and zirconium, is studied. The calculated phonon dispersion curves along the principal symmetry directions as well as the lattice heat capacities of these metals are found to be in good agreement with the experimental results.
TL;DR: The present investigation studies the changes that occur in periodontal supporting tissues of lower canine and premolar of marmosets (Callithrix jacchus), due to experimental modification of occlusal relationships in the region of the molar.
Abstract: The present investigation studies the changes that occur in periodontal supporting tissues of lower canine and premolar of marmosets (Callithrix jacchus), due to experimental modification of occlusal relationships in the region of the molar. For our purposes an extracoronal arch wire of 0.7 mm diameter was fixed into occlusal perforations of the upper third premolar and first molar, on both sides. Eight male marmosets weighing from 250 to 350 grams were used. After each experimental time interval of 7, 14, 21 and 28 days two animals were sacrificed. The results clearly showed areas of tension with stretched periodontal fibers in the distal region of the canine and areas of pressure with osseous and radicular resorption in the mesial region of the first premolar. The tissue changes may be considered to result from transmission of abnormal forces through the proximal contacts of teeth associated with displacements and minor modifications in their occlusal relationships. Similar changes may occur in a tooth distant from the teeth exposed to primary excessive occlusal forces.
TL;DR: The extended de Launay's model has been used to study the lattice dynamics of platinum and thorium lattices and calculated phonon dispersion curves along the principal symmetry directions and (π-T)-curves of them have been found to show reasonable agreement with the experimental results.
Abstract: The extended de Launay's model has been used to study the lattice dynamics of platinum and thorium Calculated phonon dispersion curves along the principal symmetry directions and (π-T)-curves of them have been found to show reasonable agreement with the experimental results
TL;DR: In this article, a dye ring laser with rotatory pre-dispersor is described, achieving a bandwidth of 0.5 nm using the crystal device only, which reduces to less than 0.05 nm if a Fabry-Perot etalon is also included.