Showing papers by "University of Florence published in 1971"
TL;DR: In this article, four anomalous Earth's bow shock locations observed during 1969 are studied, using plasma and magnetic field data from the European satellite HEOS-1, using magnetohydrodynamic equations, making use of the magnetosonic Mach number of the solar wind.
80 citations
TL;DR: Fresh guinea-pig auricles contain 39.4±4.2 mM of taurine per ml of intracellular water, but not homotaurine, increases the contractileresponse to a fixed dose of strophanthin-K.
53 citations
TL;DR: In this paper, the authors present a mathematical description for the unidimensional heat conduction in a plane infinite slab of homogeneous thermally isotropic material with a phase occurring at one limiting plane and the thermal flux prescribed on the other.
52 citations
44 citations
TL;DR: In this paper, the authors studied a two phase Stefan problem in a infinite plane slab, where the temperatures are prescribed on the two limiting planes. And they proved that the Stefan problem can be solved in a constant number of iterations.
Abstract: We studied a two phase Stefan problem in a infinite plane slab, when the temperatures are prescribed on the two limiting planes.
44 citations
TL;DR: In this article, the behavior of binary mixtures of poiy(methyl methacrylate) and poly(ethyl methacyl) at the W/A interface has been studied and compared with the corresponding behavior of two pure polymers.
42 citations
TL;DR: Venous blood from healthy premature infants, premature infants with known bacterial infections, normal term infants and adults, was incubated in vitro with Pseudomonas aeruginosa to test for the nitroblue‐tetrazolium (NBT) reducing activity of neutrophils.
Abstract: Summary
Venous blood from healthy premature infants, premature infants with known bacterial infections, normal term infants and adults, was incubated in vitro with Pseudomonas aeruginosa. At 30 min intervals, blood samples were tested for the nitroblue-tetrazolium (NBT) reducing activity of neutrophils. The results of the histochemical NBT test were compared with those of the blood controls from which bacteria were omitted.
The stimulation of neutrophils with Ps. aeruginosa induces a considerable increase of NBT reduction in all 4 groups of subjects examined. The maximum rate of NBT reduction was observed after 1 hour of incubation with the test organism, and reached its lowest degree after 3 hours. By contrast the NBT reduction by un-stimulated neutrophils of the same subjects remain unchanged during a 3 hour period of incubation.
40 citations
TL;DR: In this article, the authors studied a two phase Stefan problem in a infinite plane slab, where the thermal fluxes are assigned on the two limiting planes, and showed that the two-phase Stefan problem is NP-hard.
Abstract: We studied a two phase Stefan problem in a infinite plane slab, when the thermal fluxes are assigned on the two limiting planes.
36 citations
TL;DR: The results may be interpreted according to the point of view that myocardial alpha receptors contribute to the modulation of the repolarization phases of the action potential.
32 citations
TL;DR: Patients suffering from headache appeared particularly susceptible to the pain-producing action of fenclonine, thus supporting the hypothesis of a defect in 5-HT turnover in the pathogenesis of migraine.
28 citations
TL;DR: In this article, the electrochemical behavior of aniline in aqueous alkaline solutions on smooth platinum, platinized platinum, graphite, and gold electrodes has been investigated.
01 Mar 1971
TL;DR: In this paper, the authors compared the orientation and the energies of polyvinyl acetate at the interphase W A with the corresponding properties at W O, and showed that at the interface W A the macromolecule lies as a deformed coil with moderate flexibility and low attractive energies.
Abstract: In order to compare the orientation and the energies of polyvinyl acetate at the interphase W A with the corresponding properties at the interphase W O , the spreading isotherms at the two interfaces are reported. From the comparison of virial coefficients of bidimensional state equations with those of equations theoretically deduced, and from the values of the thermodynamic spreading properties, we have demonstrated that at the interface W A the macromolecule lies as a deformed coil with moderate flexibility and with rather low attractive energies. In contrast, at the interphase W O the cohesion energies can be considered negligible.
Journal Article•
TL;DR: Measurements of incorporation of [(14)C]leucine into kidney alkaline phosphatase in rats fed on complete or phosphate-free diet provide evidence of a twofold increase in the rate of synthesis of the enzyme in diet-treated animals.
Abstract: The mechanisms by which phosphate regulates the activity of alkaline phosphatase (orthophosphoric monoester phosphohydrolase, EC 3131) in rat kidney were investigated Measurements of incorporation of [(14)C]leucine into kidney alkaline phosphatase in rats fed on complete or phosphate-free diet provide evidence of a twofold increase in the rate of synthesis of the enzyme in diet-treated animals Cycloheximide experiments indicated that control and diet-adapted enzyme decreases in activity according to first-order kinetics with a calculated half-life of 103 and 65h after complete and phosphate-free diet administration respectively Basal and diet-adapted enzymes exhibit similar K(m) values for several phosphomonoesters and an identical degree of inhibition is produced by cysteine In addition, the enzyme from both sources is the same with regard to heat inactivation at 45, 56 or 64 degrees C, to the profile of elution from Sephadex and to electrophoretic properties on polyacrylamide gel A failure of rat kidney alkaline phosphatase to respond to cortisol (hydrocortisone) was also observed
TL;DR: The incorporation of radioactively labeled acetate occurs preferentially in the arginine-rich histone fractions, and most of the radioactive acetyl groups become attached to the E amino-nitrogen of lysine residues in the polypeptide chain.
TL;DR: In this article, the boundary value problems of different nature, concerning diffusion toward planar, spherical, and dropping electrodes at constant potential are examined, both by the rigorous numerical procedure and by the approximate methods described in Part I.
TL;DR: In this article, the authors proved the infinite differentability of the function x = s(t) giving, for all t, the abscissa of the interface plane for a two phase Stefan problem in a plane infinite slab.
Abstract: We proved the infinite differentability of the function x=s(t) giving, for all t, the abscissa of the interface plane for a two phase Stefan problem in a plane infinite slab.
TL;DR: Phentolamine, 5 μg/ml, when applied to sheep Purkinje fibres electrically driven at a constant rate, strongly decreased the maximum rate of depolarization of the action potential upstroke, and the duration and effective refractory period were shortened.
TL;DR: The vibrational assignment of the fundamentals was essentially based on the infrared crystal spectra in polarized light of different kinds of polycrystalline samples and additional evidence on the assignment was given by relative intensity measurements of the infrared and Raman bands as discussed by the authors.
TL;DR: No attempts have been carried out to determine whether the enzymatic hydrolysis of carbamyl phosphate involves the production of cyanate, but at low pH the rates of ammonia and phosphate liberation are equal, while at pH 6 the release of ammonia is higher than the rate of phosphate formation.
TL;DR: In this paper, a tetragonal pyramidal structure with approximately C4v symmetry was constructed by evacuation of Bi/Mo mixed oxide and removal of oxygen atoms from the surface.
TL;DR: In this article, the chemical and electrochemical behavior of ruthenium(II) and RUBE(III) complexes with 2,2′,2″-terpyridine has been studied.
Journal Article•
TL;DR: Lysosomal damage is postulated to play a non-secondary role in Phalloidin poisoning and the hydrocortisone protective effect to be mediated by lysosome stabilization.
01 Jun 1971
TL;DR: Una nuova metodica per la identificazione, in proteine o peptidi, degli amino acidi C-terminali marcati mediante tritiazione selettiva, basato sull'uso dell'amino acid-analyzer rispetto ad altri analoghi.
Abstract: Viene descritta una nuova metodica per la identificazione, in proteine o peptidi, degli amino acidi C-terminali marcati mediante tritiazione selettiva.
TL;DR: The ESRO satellite HEOS-1 observed heavy ions with energy per unit charge 2.5 and 4 times higher than protons as mentioned in this paper, and the driving piston of the interplanetary shock occurred on 31 March 1970.
Abstract: Plasma experiment on board of the ESRO satellite HEOS-1 observed heavy ions with energy per unit charge 2.5 and 4 times higher than protons. Observations refer to the driving piston of the interplanetary shock occurred on 31 March 1970.
TL;DR: In this paper, surface thermodynamic properties and surface viscosity have been determined for monolayers of two polymers: (1) ethylene-propylene copolymer grafted with vinyl acetate (14 KB) and (2) polybutyl methacrylate (PBMA).
TL;DR: These compounds, in concentrations which inhibit the formation of lipid peroxides, strongly labilize the lysosomal membrane and are able to disorganize the mitochondrial structure.