Showing papers by "University of Palermo published in 1980"
77 citations
TL;DR: In this article, the formation of anodic films on tungsten has been studied in 1N solutions of H 2 PO 4, H 2 SO 4, HNO 3, HClO 4 and HCl at different temperatures.
60 citations
TL;DR: The nucleosomes from chick erythrocytes can be fractionated according to their electrophoretic mobility in (comparatively) high salt acrylamide gels and it is shown that the fractionation is based predominantly on differences in charge.
Abstract: Monomer nucleosomes from chick erythrocytes can be fractionated according to their electrophoretic mobility in (comparatively) high salt acrylamide gels. We show that the fractionation is based predominantly on differences in charge. The monomer heterogeneity persists even when the nucleosomes are trimmed down to 145 bp with Exo III or when H1 and H5 are removed. The slowest migrating monomers are associated with HMG 14 and 17; however, we do not believe that these proteins are entirely responsible for the altered mobility since the nucleosome heterogeneity persists even after removal of HMG 14 and 17. The DNA associated with the HMG 14 and 17 containing nucleosomes is shown to be enriched in actively transcribed globin sequences.
55 citations
TL;DR: The technical approach as well as the complex influence of different factors (toxicity, volatility and stability) on the genetic response of each of the compounds under test did not allow to obtain more than a qualitative relationship between mutagenic potency and chemical structure.
51 citations
TL;DR: In this paper, the authors present the results of the work of the European Space Agency (ESA) and the French Service d'Electronique Physique Centre d'Etudes NucMaires de Saclay Saclay, France.
Abstract: *Max-Planck-lnstitut fur Extraterrestrische Physik Garching bei Miinchen, Federal Republic of Germany ?Space Science Department of the European Space Agency, ESTEC Noordwijk, the Netherlands $Laboratorio di Fisica Cosmica e Tecnologie Relative del C.N.R. Universita di Milano Milan. Italy $Laboratorio di Fisica Cosmica e Tecnologie Relative del C.N.R. Universita di Palermo Palermo. Italy YCosmic Ray Working Group, ffuygens Laboratory Leiden, the Netherlands 11 Service d'Electronique Physique Centre d'Etudes NucMaires de Saclay Saclay, France
35 citations
TL;DR: In this paper, it was shown that both Burgers and Korteweg-de Vries equations with non-uniformity terms can be reduced to a Burgers or Kortegard-de-Vries equation with constant coefficients if these terms satisfy a compatibility condition.
32 citations
TL;DR: Two women with vesico‐uterine fistulae causing amenorrhoea and cyclic hematuria were successfully treated by the continuous administration of an oestrogen‐progestogen combination for six months.
26 citations
TL;DR: The cumulative association constant (β 2 ) for the geochemically important aqueous complex UO 2 [HPO 4 ] 2− 2 has been determined by potentiometric titration in Na 2 HPO 4 -UO 2 (NO 3 ) 2 solutions in the pH range 3.9-4.7, at ionic strengths below 0.024 molal with the Newton-Raphson method used to compute β 2 from the chemical analytical data as mentioned in this paper.
26 citations
TL;DR: In this paper, the growth of porous films, whose thickness increases with time and depends upon the current density, was investigated. But the results were limited to anodic oxide films on tungsten.
25 citations
TL;DR: In this article, the 70 eV electron impact mass spectra of twelve 5 and 3-substituted thiophene-2-carboxamides are discussed with the aid of exact mass measurements and labelling experiments.
Abstract: The 70 eV electron impact mass spectra of twelve 5- and 3-substituted thiophene-2-carboxamides are discussed with the aid of exact mass measurements and labelling experiments. All mass spectra exhibit pronounced molecular ions. Some isomeric 5- and 3-substituted title compounds can be differentiated by mass spectrometry. The fragmentation is influenced by a strong ‘ortho-effect’ which activates the NH3 elimination. In the other cases the most important fragmentation is NH2˙ loss, followed by CO elimination.
20 citations
TL;DR: In this paper, the γ-radiation effects on a commercial polycarbonate have been observed through rheological measurements, performed both on solutions and on the bulk polymer, and through dynamic-mechanical tests.
TL;DR: In this article, the diffusion of oxygen vacancies from the oxide-electrolyte interface into the bulk of the polycrystalline layers of WO3−x·H2O (0
Abstract: Polycrystalline layers of WO3·H2O are obtained by anodization of tungsten in 1 N H2SO4 at 70° C. The cathodic reduction of these layers in acid solutions causes the formation of blue WO3−x·H2O (0
TL;DR: An approach which allows us to define in an unambiguous way the concepts of symmetrical, complementary and parallel interaction is proposed, which allows for a probabilistic theory of change of interacting subjects.
Abstract: In studying the problem of interaction between subjects, an approach which allows us to define in an unambiguous way the concepts of symmetrical, complementary and parallel interaction is proposed. This approach makes use of a point of view within which it is possible to develop a rational model based only on some fundamental elements of set theory and mathematical logic The model allows us to develop a probabilistic theory of change, the representation basis of which is furnished by the 16 basic set functions. The functions represent operations on two partially overlapping sets, which will be called the “worlds”, of interacting subjects.. Both an interaction test that allows a “measure” of the relation parameters and the preliminary results of a dyadic interaction experiment are presented Some remarks can be made from the results of the present experiment and from other similar ones. Among these there are evidences that the symmetrical, complementary and parallel classes of interactions belong t...
TL;DR: In the presence of small amounts of [Ru(η 4 -COD) (η 6 -C 8 H 10 )] (1), cycloheptene is hydrogenated to cyclohexene, under one atmosphere of hydrogen at room temperature in homogeneous phase.
TL;DR: Findings suggest that Adriamycin causes an increase of lipid peroxidation in mouse cardiac homogenates that is dependent on the concentration of the antiblastic, and this phenomenon is not observed in the hearts of mice treated with an elevated dose of the drug.
TL;DR: The kinetic behavior of the geometrical isomers I-E and I-Z of the title compound in the presence of piperidine in benzene has been investigated in this article.
TL;DR: Certain organisms resembling blue-green algae embedded in the tunic of the solitary ascidian Ciona intestinalis L. are described and their probable symbiotic role as related to the peculiar habitat of this ascidian is suggested.
Abstract: Certain organisms resembling blue-green algae embedded in the tunic of the solitary ascidian Ciona intestinalis L. are described. Their probable symbiotic role as related to the peculiar habitat of this ascidian is suggested.
TL;DR: In this paper, stress relaxation experiments in the limit of small deformations have been carried out in a wide range of temperatures for pure nylon 6 and its mixtures with LiBr and/or LiCl.
Abstract: Stress-relaxation experiments in the limit of small deformations have been carried out in a wide range of temperatures for pure nylon 6 and its mixtures with LiBr and/or LiCl. Master curves have been constructed, by allowing horizontal shifts only, showing the shape typical for semicrystalline polymers in the case of pure nylon and that of essentially amorphous polymers in the case of salted samples. The glass transition temperatures determined from the plot logaT− 1/T is increased when in the presence of salts. All such effects are considered to reflect the binding action of Li+ and Br− ions.
TL;DR: In this paper, it was shown that f is periodic or nil in R if for all r1, rd ∈ R we have a polynomial f(r 1, R rd, rd) is periodic, respectively nilpotent.
Abstract: Let R be an associative ring and f(x1,…, xd) a polynomial in noncommuting variables. We say that f is periodic or nil in R if for all r1,…, rd ∈ R we have that f(r1,…, rd) is periodic, respectively nilpotent (recall that a ∈ R is periodic if for some integer ).
TL;DR: In this article, the glass transition temperature and elastic modulus of nylon-6 and its mixtures with 4% w/w LiCl and with 2% LiCl+3% LiBr were investigated.
Abstract: The glass-transition temperature (Tg) and the elastic modulus of nylon-6 and its mixtures with 4% w/w LiCl and with 2% LiCl+3% LiBr were investigated. In one set of experiments care was taken to avoid absorption of moisture during the measurements. In another set of experiments, samples were exposed to atmospheric humidity for different lengths of time. Both unoriented and oriented specimens were investigated. The presence of 4% LiCl almost doubles the amount of moisture absorbed at equilibrium by nylon-6. The Tg was found to be greatly affected by the moisture content and by salt type. When strict precautions to exclude moisture are taken, the addition of 4% LiCl raises the Tg of nylon-6 by about 25°C. The elastic modulus of oriented samples is increased by the addition of salts provided moisture is completely absent. This beneficial effect is, however, completely eliminated when samples are allowed to equilibrate with atmospheric moisture.
TL;DR: In this article, the effect of deformation level and loading rate on compression creep and stress-relaxation behavior of a polycarbonate has been studied, and the possibility of obtaining master curves has been examined throughout.
TL;DR: Barbaro et al. as discussed by the authors extended the application of an atmospheric model for computing the direct and diffuse solar radiation to some actinometric stations in Sicily, namely Gela, Messina, Pantelleria, Trapani and Ustica.
TL;DR: Diabetics have the same incidence of HBsAg but significantly higher anti-HBc antibodies than a normal population, but differences were seen in the group of diabetics on oral hypoglycemic therapy.
Abstract: The presence of HBV markers was determined in 149 serum samples obtained from diabetic patients and was compared with a normal population. Diabetics have the same incidence of HBsAg but significantly higher anti-HBc antibodies. These differences were seen in the group of diabetics on oral hypoglycemic therapy. These results cannot yet be explained.
TL;DR: These unusual features of unfertilized egg chromatin, not shared by oocytes or sperms, are discussed in view of the unique properties and fate of mature female germ cells.
TL;DR: The spiro compounds as mentioned in this paper underwent thermal and acid-catalysed conversion into the hitherto unknown 2-benzopyrano[4,3-c]pyrazole ring system.
TL;DR: In this paper, the sign of the nuclear quadrupole splitting ΔE and the value of the asymmetry parameter η have been calculated for environments of tin atoms in I-VIII which are plausible in view of the results of previous investigations.
TL;DR: In this article, stress relaxation data after single and double elongational strain “steps” were collected on a commercial polyisobutylene, Oppanol B 50, and a separability of deformation and time effects was observed over an extended time region for the relaxation after single "steps".
Abstract: Stress relaxation data after single and double elongational strain “steps” were collected on a commercial polyisobutylene, Oppanol B 50. Analogously to other cases a separability of deformation and time effects was observed over an extended time region for the relaxation after single “steps”. Moreover, by comparing the results after double with those after single steps, it was noted that any rheological equation of integral type having a rigorously constant memory function is not able to describe accurately the full body of results presented here. On the other hand the data were favorably compared with the predictions of a model proposed earlier.
TL;DR: In this paper, the authors deal with elastic-perfectly plastic solids which shake down to a purely elastic state under the action of quasi-static loads which vary arbitrarily remaining within a given domain and present a technique for bounding the dissipation energy which is done locally at a given point of the body during the adaptation process.