Showing papers by "Sapienza University of Rome published in 1976"
01 Jan 1976
TL;DR: Ohanian and Ruffini's Gravitation and Spacetime, Second Edition, the authors is the best book on the market today of 500 pages or less on gravitation and general relativity.
Abstract: Now more than ever, Gravitation and Spacetime, Second Edition, by Hans C. Ohanian and new coauthor Remo Ruffini, deserves John Wheeler's praise as "the best book on the market today of 500 pages or less on gravitation and general relativity." Gravitation and Spacetime has been thoroughly updated with the most exciting finds and hottest theoretical topics in general relativity and cosmology. Highlights of the revision include the rise and fall of the fifth force, principles and applications of gravitational lensing, COBE's spectacular confirmation of the blackbody spectrum of the cosmic thermal radiation, theories of dark matter and inflation, and the early universe as a testing ground for particle physicists' unification theories, and much, much more. The ideal choice for a graduate-level introduction to general relativity, Gravitation and Spacetime is also suitable for an advanced undergaduate course.
547 citations
TL;DR: It is the opinion is that a precise difference exists between the structures of these two types of coverings.
Abstract: Athletic Injuries (American Medical Association) is based on symptomatology and clinical findings. This classification is as follows: ( 1 ) tenosynovitis, (2) tendinitis, (3) ruptures. The term tenosynovitis is used indiscriminately to refer to tendons that are invested by true synovial sheaths as well as tendons, like the tendo Achilles, that are in actuality surrounded by peritendon.1 Our opinion is that a precise difference exists between the structures of these two types of coverings. We reserve the use of the term tenosynovitis exclusively to refer to acute and chronic inflamatory processes involving true synovial sheaths.
406 citations
Book•
01 Jan 1976TL;DR: Ohanian and Ruffini's Gravitation and Spacetime, Second Edition, the authors is the best book on the market today of 500 pages or less on gravitation and general relativity.
Abstract: Now more than ever, Gravitation and Spacetime, Second Edition, by Hans C. Ohanian and new coauthor Remo Ruffini, deserves John Wheeler's praise as "the best book on the market today of 500 pages or less on gravitation and general relativity." Gravitation and Spacetime has been thoroughly updated with the most exciting finds and hottest theoretical topics in general relativity and cosmology. Highlights of the revision include the rise and fall of the fifth force, principles and applications of gravitational lensing, COBE's spectacular confirmation of the blackbody spectrum of the cosmic thermal radiation, theories of dark matter and inflation, and the early universe as a testing ground for particle physicists' unification theories, and much, much more. The ideal choice for a graduate-level introduction to general relativity, Gravitation and Spacetime is also suitable for an advanced undergaduate course.
302 citations
TL;DR: In view of the many analogies presented by these two proteins, the possibility of obtaining, also in the case of Rhus vemicifera lactase, selective removal of Type 2 copper is investigated.
90 citations
TL;DR: It was found that in red blood cells catalase acts in series with superoxide dismutase against bursts of oxygen radicals formed from oxyhemoglobin, while glutathione & peroxidase may protect the cell membrane against low concentrations of H2O2.
Abstract: The enzymatic destruction of oxidizing products produced during metabolic reduction of oxygen in the cell (such as singlet oxygen, H2O2 and OH radical) involves the concerted action of superoxide dismutase-which removes O
2
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and yields H2O2-and H2O2 removing enzymes such as catalase and glutathione peroxidase. A difference in distribution or ratio of these enzymes in various tissues may result in a different reactivity of oxygen radicals. It was found that in red blood cells superoxide dismutase and catalase are extracted in the same fraction as hemoglobin, while glutathione peroxidase appears to be “loosely” bound to the cellular structure. This suggests that in red blood cells catalase acts in series with superoxide dismutase against bursts of oxygen radicals formed from oxyhemoglobin, while glutathione & peroxidase may protect the cell membrane against low concentrations of H2O2. On the other hand, catalase activity is absent in various types of ascites tumor cells, while glutathione peroxidase and superoxide dismutase are found in the cytoplasm. However, the peroxidase/dismutase ratio is lower than in liver cells, and this may provide an explanation for the higher susceptibility of tumor cells to treatments likely to involve oxygen radicals.
88 citations
01 Jan 1976
TL;DR: In this paper, both the input/output approach and the Lyapunov approach are considered, and it is shown how these may be viewed and unified in the context of dissipative systems.
Abstract: An exposition of the concepts and of the results in feedback system stability is given. Both the input/output approach and the Lyapunov approach are considered, and it is shown how these may be viewed and unified in the context of dissipative systems.
70 citations
TL;DR: The applicability to red blood cells of two widely used methods for spectrophotometric assay of superoxide dismutase activity has been tested, in view of the demand for routine screening of the level of this enzyme in various circumstances of hematological interest.
65 citations
TL;DR: In this paper, the nucleoproteins of spermatozoa from infertile, oligospermic patients affected by partial idiopathic spermatidic arrest were analyzed by means of polyacrylamide gel electrophoresis.
56 citations
TL;DR: Comparison of the data obtained from this material with those furnished by an electron microscope investigation carried out on the loaded osteons suggests that the change in slope at low stresses is due to failure of the interfibrillar cementing substance in those lamellae having fiber bundles oriented perpendicularly to the loading direction.
51 citations
TL;DR: In this paper, the application of Tenax® to the extraction of organic micro-pollutants such as pesticides and polychlorobiphenyls from waters has been studied, and it has been observed that also in the presence of other pollutants (oil, surface-active substances, etc.) the results obtained with an absorption column of tenax-Celite are equivalent to those obtained with the continous liquid-liquid extraction technique.
51 citations
TL;DR: In this article, the dispersion characteristics of surface polaritons in GaP are measured and compared with theoretical calculations using optical four-wave mixing, and they demonstrate experimentally that optical fourwave mixing can be used to study surface polariton in solids.
Abstract: We demonstrate experimentally that optical four-wave mixing can be used to study surface polaritons in solids. The dispersion characteristics of surface polaritons in GaP are measured and compared with theoretical calculations.
01 Mar 1976
TL;DR: In this paper, the dielectric behavior of polystyrene aqueous suspensions with low ionic conductivity has been investigated in the frequency range 5 kHz to 30 MHz, and the observed dispersions have been studied as due to the overlapping of two distinct processes, on the basis of the Schwarz-Schurr model.
Abstract: The dielectric behavior of polystyrene aqueous suspensions with low ionic conductivity has been investigated in the frequency range 5 kHz to 30 MHz. The observed dispersions have been studied as due to the overlapping of two distinct processes, on the basis of the Schwarz-Schurr model. The characteristic parameters of the model, as a function of temperature, have been valued.
TL;DR: The most frequently and abundantly occuring amines were indolealkylamines, represented by their prototype 5-HT, by the entire series of N-methylated derivatives of 5HT (N′-methyl-5-HT), by some new compounds: O -sulphate of bufotenine, O -subsequently, O-subsequently and the quaternary ammonium derivative of tryptamine as mentioned in this paper.
TL;DR: In this paper, electron microscopy analysis of rDNA has been carried out, searching for circular molecules and their replicative intermediates, up to about 20 ribosomal gene units were found.
TL;DR: There was a statistically significant correlation between the levels of octopamine and hepatic encephalopathy and the reaction of transmethylation used in the assay ofOctopamine was constantly found to be inhibited by the presence of plasma.
TL;DR: The result obtained support the following conclusions: a) the expression of the differentiative characters examined does not require cell fusion; b) the process of myotube formation seems to imply two subsequent stages consisting first of a slow maturative process, which is followed by the actual fusion of cell membranes.
TL;DR: Ovulation or a related event appears to be the signal for the decrease in LDH-1 synthesis, and fertilization is not required.
TL;DR: The reaction between bovine rhodanese (thiosulfate:cyanide sulfurtransferase, EC 2.8.1.1) and reduced dithiothreitol has been studied and an inactivation was observed at high ditho-enzyme ratios or at very low enzyme concentrations.
TL;DR: Circular dichroism spectra of Lumbricus erythrocruorin in the Soret region give direct evidence of a local alteration in the heme environment under the conditions which affect co-operativity in oxygen binding of the undissociated molecule.
TL;DR: Chloride and sodium binding to Lumbricus erythrocruorin and its 10 S subunits have been measured directly in quadrupole relaxation experiments as mentioned in this paper.
TL;DR: The authors report the incidence of portal thrombosis in their experience, of patients who have been operated on for splenectomy as treatment for portal hypertension with splenomegaly and hypersplenism without a portal systemic shunt.
Abstract: The authors report the incidence of portal thrombosis in their experience, of patients who have been operated on for splenectomy as treatment for portal hypertension with splenomegaly and hypersplenism without a portal systemic shunt. In 161 patients studied angiographically for portal hypertension due to cirrhosis, portal thrombosis was shown in 19 patients. Of these 19 patients 13 were previously splenectomized. Only 6 were never operated upon.
TL;DR: Needle biopsies from the iliac crest of 40 uremic patients treated with hemodialysis have been compared by light and electron microscopy and showed that the enlargement and irregularity of the osteocytic lacunae were not always due to osteocytics osteolysis; the same effect might be due to defective calcification of the lacunar wall.
Abstract: Needle biopsies from the iliac crest of 40 uremic patients treated with hemodialysis have been compared by light and electron microscopy. The most obvious bone changes were represented by an increased amount of osteoid tissue (osteomalacic changes) and by enhanced bone resorption. The osteomalacic changes were chiefly characterized by the presence of thick osteoid borders whose collagen fibrils were often completely uncalcified. In a few cases, small roundish aggregates of crystals were irregularly present through the osteoid matrix; some of them were closely related to roundish, electron-dense bodies surrounded by a membrane. The increased rate of bone resorption, which was often comparable to that which occurs in the most severe cases of plimary hyperparathyroidism, was due to both osteoclastic activity and osteocytic osteolysis. Electron microscopy showed that the enlargement and irregularity of the osteocytic lacunae were not always due to osteocytic osteolysis; the same effect might be due to defective calcification of the lacunar wall. The advantages of comparing the same specimens under the light and electron microscopes are discussed.
TL;DR: The antiatherogenic effect of glucocorticoids on cholesterol-fed rabbits may be due, at least partly, to the inhibitory effect of these steroids on the DNA synthesis of the cellular components of the intimal plaques.
TL;DR: Emilia CHIANCONE, Jan-Erik NORNE, Sture FORSEN, Ali MANSOURI and Kaspar H. WlNTERHALTER CNR Center for Molecular Biology, Institutes o f Chemistry and Biochemistry, Faculty of Medicine, University of Rome 00185 Rome, Italy.
TL;DR: The marginal band of microtubules is present in nucleated erythrocytes of nonmammalian vertebrates as mentioned in this paper, and its role attributed to the development and maintenance of the flat ellipsoidal shape of the mature red blood cell.
TL;DR: In this paper, the electrochemical properties of a series of electrode materials in a copper solid electrolyte were investigated and the results indicated that TiS2 and Cu1.8S may be considered as very promising cathodes for reversible copper solid-state cells.
TL;DR: It is hypothesized that progestational therapy may be useful in the treatment of renal adenocarcinoma in which both estradiol and progesterone receptors are present.
TL;DR: During the course of the study information was obtained on the structure of apoferritin and its isolated subunits with respect to the nature of the environment of the fluorescent residues, and binding of the ferrous salt to the protein can be inferred from the quenching of the intrinsic fluorescence.
TL;DR: The kinetics and equilibria of carbon monoxide and ethylisocyanide binding reported here show a dependence on protein concentration that supports the conclusion that the aggregated hemoglobin has a lower ligand affinity than the dissociated subunits.