Showing papers by "University of Bologna published in 1985"
TL;DR: This kind of ultrasound study of the antropyloric region allows accurate determination of total gastric emptying time, which is found in dyspeptic patients than in control subjects.
424 citations
TL;DR: Data indicate that severe ischaemia induces a reduction of the protective mechanisms against oxygen toxicity.
390 citations
TL;DR: In this article, the surface chemistry of anatase, in particular acidity, greatly depends on the preparation of the sample, both through the resulting morphology and the presence of surface impurities.
364 citations
TL;DR: On demontre l'unicite de solutions faibles et l'existence and l'uniformity de solutions globales fortement continues dans l'espace energie as mentioned in this paper.
Abstract: On demontre l'unicite de solutions faibles et l'existence et l'unicite de solutions globales fortement continues dans l'espace energie
347 citations
TL;DR: In this article, the existence of global weak solutions for non-linear Schrodinger equations is proved by a compactness method and, under stronger assumptions, the uniqueness of those solutions is established.
Abstract: We study the Cauchy problem for a class of non-linear Schrodinger equations. We prove the existence of global weak solutions by a compactness method and, under stronger assumptions, the uniqueness of those solutions, thereby generalizing previous results.
345 citations
TL;DR: The study revealed several preferential sites where viable tumor was likely to persist: soft tissues, cortex, subcortex, ligaments, and areas in contact with cartilage (growth plate and/or articular cartilage).
Abstract: The predominant sites of viable and nonviable tumor were determined in the primary lesions of 50 patients with osteosarcoma after initial treatment with preoperative chemotherapy. The degree of tumor destruction was classified as good, fair, and poor and a map of the sites revealing viable and nonviable tumor was constructed. The study revealed several preferential sites where viable tumor was likely to persist: soft tissues, cortex, subcortex, ligaments, and areas in contact with cartilage (growth plate and/or articular cartilage). Localized areas of hemorrhage and necrosis, designated "lacunae," were noted within the tumor. They were frequently surrounded by bundles of viable tumor and appeared to correlate with open surgical biopsies. Factors responsible for this phenomenon and the persistence of viable tumor are discussed. The findings have important implications in the design of surgical treatment and in the use of needle biopsies to determine the effects of preoperative treatment.
251 citations
TL;DR: The full extent of the tragedy of Hermann Grassmann, which has been unfolding since his death, by a succession of misadventures and misunderstandings of his work unique in the history of modern mathematics, is yet to be fully realized.
185 citations
TL;DR: Calcitonin gene-related peptide-like immunoreactivity was localized in neuronal processes and somata of the rat gastrointestinal tract and suggest that CGRP may be involved in regulatory functions of the gastrointestinal tract.
151 citations
TL;DR: In this paper, the absorption spectra, emission spectra and emission lifetimes of Pt(Phpy)2, Pt(Thpy) 2, and Pt(Bhq)2 complexes have been studied and compared with those of the C-protonated neutral ligands, and the low energy absorption bands in the near UV and visible region are assigned to metal-to-ligand charge-transfer transitions.
140 citations
01 Jan 1985
TL;DR: In this paper, the process zone at the crack tip of a concrete-like material can be simulated in two different alternative ways: (a) with a damage zone in front of the stress-free crack tip, or (b) with cohesive force distribution behind a fictitious crack tip.
Abstract: The process zone at the crack tip of a concrete-like material can be simulated in two different alternative ways: (a) with a damage zone in front of the stress-free crack tip, or (b) with a cohesive force distribution behind a fictitious crack tip. Both these numerical models are able to simulate the slow crack growth and to reproduce the scale effects of fracture toughness testing. With large structural sizes the softening structural behaviour disappears and the global ductility drastically decreases. In the damage model, this is due to the priority of the crack instability over the traditional structural instability. On the other hand, in the cohesive model, this is revealed by a bifurcation of the global equilibrium, the stress-singularity being not included in such a model.
128 citations
TL;DR: The results obtained showed that antibody titres detected by immunoassay correlate with the intensity and the number of polypeptides reacting by immunoblotting (IB).
Abstract: To define better the human immune response to individual structural proteins of human cytomegalovirus (HCMV), 55 human sera with different IgG and IgM titres were studied for their reactivity with HCMV structural polypeptides separated by SDS-PAGE and electrotransferred to nitrocellulose paper. The results obtained showed that antibody titres detected by immunoassay correlate with the intensity and the number of polypeptides reacting by immunoblotting (IB). The IB profiles of HCMV polypeptides reacting with different sera having the same antibody titres show considerable variation. Sera with high levels of IgG antibody and that are IgM-positive frequently react with 155, 149, 82.5, 74.5, 67, 57, 55, 38.5, and 28 kD polypeptides; all these sera react with 155, 67, 57, 55, 38.5 kD polypeptides. Sera with high levels of IgG antibody but that are IgM negative frequently react with all these polypeptides, with the exception of 149 and 74.5. Only 155 and 28 kD polypeptides were recognized by all sera of this group. The sera with moderate levels of IgG antibody preferentially recognize 155, 110, 82.5, 62, 55, 38.5 and 28 kD polypeptides. The sera with low levels of antibody reacted especially with 155 and 62 kD polypeptides. IgM antibody seems to recognize preferentially 155, 110, 67, 57, 55, 38.5 kD polypeptides.
TL;DR: In this paper, it was shown that the magnitude errors are a quadratic function of the error standard deviation σ and the apparent number of the earthquakes in the frequency-apparent magnitude law.
Abstract: The evaluation of the parameters in the Gutenberg-Richter (GR) frequency-magnitude law log Nr = a − bm is shown to be strongly affected by magnitude uncertainties. If the magnitude errors are assumed to be distributed normally with standard deviation σ, the observed magnitude that we call the “apparent magnitude,” becomes a random variable, and the frequency-apparent magnitude law differs from the GR relation. We show that there is a range of magnitudes within which this law may be approximated as log Na = a − bm + γ2log(e). Here, γ2 = β 2σ2/2, [ β = b /log(e)], and Na stands for the apparent number of the earthquakes. As both the true and the apparent magnitude curves have the same slope on a logarithmic graph, the estimators usually employed for β remain valid. However, the usual estimators for a are biased by a quantity which is a quadratic function of the error standard deviation σ and of β . This implies that the apparent number, Na , of earthquakes exceeding a given magnitude tends to be larger than the real number Nr and for realistic values of a and b (or β ), Na is expected to be even as large as twice Nr . The implications of the magnitude variability on the seismic risk analysis are also considered: in particular, the evaluations of the attenuation law parameters and of the exceedance probability of the ground motion peak acceleration are shown to be affected.
TL;DR: A possible role for glutathione is suggested in the determination of functional damage induced by myocardial ischemia and reperfusion and reduction of the content of tissue GSH with no significant changes in GSSG.
Abstract: In the isolated and perfused rabbit heart ischemia induced a rapid decline of contractility, associated with a reduction of the content of tissue GSH with no significant changes in GSSG. Reperfusion induced a small recovery of contractility, a substantial release of total glutathione and a further decrease in the content of tissue GSH with a significant increase of tissue GSSG. Glutathione reductase and glutathione peroxidase activities were not affected by ischemia and reperfusion. This study suggests a possible role for glutathione in the determination of functional damage induced by myocardial ischemia and reperfusion.
TL;DR: The uterus and ovaries of 50 patients with polycystic ovarian disease and 30 eumenorrheic women were studied with a real-time ultrasound mechanical sector scanner and found the need for a reconsideration of the ultrasonographic criteria of PCOD is emphasized.
TL;DR: Proposition d'une methode simple, rapide et generale combinant le principe de superposition and une methode a elements finis pour resoudre les problemes de transfert de chaleur conjugues as mentioned in this paper.
Abstract: Proposition d'une methode simple, rapide et generale combinant le principe de superposition et une methode a elements finis pour resoudre les problemes de transfert de chaleur conjugues. Effet de la conduction de la paroi sur le transfert de chaleur. Resultats pour deux valeurs de chacun des quatre parametres determinant l'importance relative de la conduction axiale (nombre de Peclet du fluide, rapport des conductivites de la paroi et du fluide, epaisseur et longueur sans dimension de la section chauffee de tuyau)
TL;DR: In this article, a thermally driven mass transport process across hydrophobic membranes has been investigated and a quantitative theory for the process has been developed based on the evaporation-condensation steps occurring at the membrane interfaces.
TL;DR: In this paper, the reactions taking place during melt mixing of bisphenol-A polycarbonate (PC) with poly(ethylene terephthalate) (PET) were studied by selective degradation of PC sequences, solubility tests, and IR spectroscopy.
Abstract: In this work the reactions taking place during melt mixing of bisphenol-A polycarbonate (PC) with poly(ethylene terephthalate) (PET) were studied by selective degradation of PC sequences, solubility tests, and IR spectroscopy. It was found that exchange reactions between PC and PET took place, contrary to what has been previously suggested by other authors. Kinetic constants were evaluated from intrinsic viscosity measurements of PET blocks. The reaction rate was slow when only the Sb catalyst (residues of the PET polymerization) were present, but it was significantly accelerated by the addition of Ti(OBu)4. In the presence of the latter catalyst, other side reactions, leading to discoloration and gas evolution, took place.
TL;DR: The problem of analyzing the stability of periodic equilibrium regimes in nonlinear microwave circuits is tackled by a general-purpose computer-aided approach, and the use of a vector processor allows the computer time requirements to be kept well within reasonable limits, even in the case of large-size problems.
Abstract: The problem of analyzing the stability of periodic equilibrium regimes in nonlinear microwave circuits is tackled by a general-purpose computer-aided approach. By means of a perturbation technique, the search for instabilities is reduced to a generalized eigenvalue equation expressed in matrix form, and is then carried out by Nyquist's analysis. The use of a vector processor allows the computer time requirements to be kept well within reasonable limits, even in the case of large-size problems. In perspective, this could open the way to the complementation of existing nonlinear CAD packages by an on-line facility for automatic stability analysis.
TL;DR: The prognosis was worse in (1) tumors larger than 5 cm in diameter, (2) tumors that recurred early (less than 1 year) after surgery, and (3) tumor that had inadequate surgical treatment (intralesional or marginal excision).
Abstract: Seventy-eight cases of malignant fibrous histiocytoma (MFH) of soft tissues are reported. All tumors were deeply located in the extremities. An analysis is presented with regard to sex, age, site, macro- and microscopic features. The staging was assessed according to Enneking's classification (IB, one case; IIA, 25 cases; IIB, 42 cases; III, 10 cases). The recurrence rate after surgical treatment was high (37.5%) with significant differences after inadequate surgery (70%), wide excision (38%), or amputation (0%). Adjunctive radiotherapy rarely was effective in preventing local recurrence. The overall 5-year survival rate was 36%. The prognosis was worse in (1) tumors larger than 5 cm in diameter, (2) tumors that recurred early (less than 1 year) after surgery, and (3) tumors that had inadequate surgical treatment (intralesional or marginal excision).
TL;DR: A ribosome inactivating protein from Saponaria officinalis, SO-6, was purified and the N-terminus sequenced and shows extensive homology with Pokeweed antiviral protein, Pokeweed anti-viral protein II, Poke weed antiviral seed protein and dodecandrin.
TL;DR: The results seem to indicate that DYN A in the spinal cord causes alterations in nociception and motor function, clearly distinguishable in time and both mediated by an opioid receptor, probably of the kappa type.
TL;DR: In this paper, the relationship between the twisting power and the molecular structure of the dopant and neraatic solvent is discussed, and the mechanism of induction seems to be connected to the transfer of chirality from the solute to the solvent via chiral conformations of the latter.
Abstract: The relationship between the twisting power (β) and the molecular structure of the dopant and neraatic solvent are discussed. High values of β are observed whenever two (or more) planar or quasi-planar moieties, chirally distorted one with respect to the other, are present in the dopant. For high twisting powers, the mechanism of induction seems to be connected to the transfer of chirality from the solute to the solvent via chiral conformations of the latter. Sterochemical and analytical applications are briefly discussed.
TL;DR: In this paper, the qualitative features for four-jet events arising from the QCD radiation process and from multi-parton scattering were compared at collider energies, and experimental tests discriminating between the two reaction mechanisms were presented.
TL;DR: In this article, the role played by transient rheology in the interpretation of mantle viscosity is reexamined by comparing the amplitude responses with the data of secular variation of J(2), the relative sea-level histories at sites well within the ice margins and at the ice margin like the city of Boston.
Abstract: The role played by transient rheology in the interpretation of mantle viscosity is reexamined. The investigation has been carried out by comparing the amplitude responses with the data of secular variation of J(2), the relative sea-level histories at sites well within the ice margins and at the ice margin like the city of Boston. A linear Burgers body rheology has been assumed in ther lower mantle. The data near the edge of the ice load proves most sensitive to the transient viscosity structure. The non-monotonic behavior of sea-level data near Boston can be explained both by a steady-state lower mantle viscosity of 10 to the 22nd P with a thick lithosphere and by a transient lower mantle rheology but with a thin lithosphere. The long-term viscosity of the lower mantle in this second model has a steady-state value of around 5 x 10 to the 23rd P.
TL;DR: Neuropeptide Y-like immunoreactivity in the heart and great vessels coexists with that for catecholamines and is likely to originate from sympathetic ganglia.
Abstract: The localization and distribution of neuropeptide Y-like immunoreactivity in the guinea-pig heart were studied by use of immunohistochemical methods. A widespread distribution of immunoreactive processes was observed in all regions of the heart. They occur either singly or together with several other immunoreactive processes and are most often aligned parallel to the myocardial bundles. A dense network of processes is present in the region of both the sinuatrial and atrioventricular nodes and single fibers are occasionally observed to be closely associated with nodal ganglion cells. Positive cell bodies were not seen within the heart. All small, medium and large coronary vessels are surrounded by a dense network of immunoreactive processes. A rich innervation at the media-adventitia junction of the aorta, pulmonary trunk, superior and inferior vena cava was also observed. Comparison of adjacent sections stained with antisera directed to avian pancreatic polypeptide, carboxyl-terminal hexapeptide of pancreatic polypeptide or neuropeptide Y demonstrated a very similar immunoreactive pattern, suggesting that these antisera are reacting with the same or a closely related substance. Likewise, the same immunoreactive patterns were observed in adjacent sections incubated in antiserum to neuropeptide Y or tyrosine hydroxylase, and analysis of elution-restained sections demonstrated that the same processes contain both neuropeptide Y- and tyrosine hydroxylase-like immunoreactivity. Neuropeptide Y- and tyrosine hydroxylase-like immunoreactivity was reduced by the same magnitude after treatment with the sympathetic neurotoxin 6-hydroxydopamine, but it was not affected by the primary sensory neurotoxin capsaicin. Furthermore, the pattern of neuropeptide Y- and tyrosine hydroxylase-like immunoreactivity did not match the staining patterns observed with antisera to vasoactive intestinal polypeptide or substance P or with the acetylcholinesterase staining pattern. In conclusion, neuropeptide Y-like immunoreactivity in the heart and great vessels coexists with that for catecholamines and is likely to originate from sympathetic ganglia.
TL;DR: Four girls affected with the Rett syndrome showed stereotyped hand movements and psychomotor regression beginning in the first or second year of life after initially normal development, with total loss of language, a severe gait, and chewing and swallowing disturbances.
Abstract: Four girls affected with the Rett syndrome showed stereotyped hand movements and psychomotor regression beginning in the first or second year of life after initially normal development, with total loss of language, a severe gait, and chewing and swallowing disturbances. Breathing during active wakefulness was abnormal, with clusters of arrhythmic, tachypneic and irregular respiratory acts, intermixed with prolonged apneic episodes causing cyanosis and even fainting. On the other hand, breathing was regular during both NREM and REM sleep stages. Breathing impairment in the Rett syndrome is characterized by an inability to maintain normal respiratory patterns during wakefulness, and represents a functional disturbance of the behavioral control of breathing, which occurs during active wakefulness.
TL;DR: In this paper, the effects of free convection on the laminar flow of water through a circular duct having essentially constant wall heat transfer rate per unit length of the duct and circumferentially uniform wall temperature were investigated.
Abstract: This investigation considers the effects of free convection on the laminar flow of water through a circular duct having essentially constant wall heat transfer rate per unit length of the duct and circumferentially uniform wall temperature. The effect of the Reynolds and Rayleigh number variations on heat transfer results has been analysed for both horizontal and inclined pipe. The experiment has covered the range of the inlet Reynolds number from 200 to 2300, and of the Rayleigh number from 6,000 to 70,000. The effect of pipe inclination has been investigated for slope angle values up to 60°, with laminar ascending flow.
TL;DR: A highly flocculent, non-H(2)S-forming wine yeast strain with a high fermentation rate and high ethanol production was obtained.
Abstract: Hybridization by spore conjugation was used to develop new and improved wine yeasts of Saccharomyces cerevisiae. The procedure was achieved with diploid, homothallic strains with high sporulation frequency and high spore viability. The method was verified by crossing flocculent and non-H(2)S-forming strains. Single-spore descendants of the hybrids were studied by tetrad analysis with regard to the aforementioned characters and the other two winemaking traits, i.e., ethanol production and fermentation rate. A highly flocculent, non-H(2)S-forming wine yeast strain with a high fermentation rate and high ethanol production was obtained.
TL;DR: Volkensin, a highly toxic protein from the roots of Adenia volkensii, was purified by affinity chromatography on acid-treated Sepharose 6B and determined the amino acid, amino sugar, and neutral sugar composition of the protein.
TL;DR: Symptomless coeliac disease is a commoner cause of short stature than is hypopituitarism; by use of the IFL-AGA test it is possible to select patients for biopsy, thereby identifying most of the coeliasis patients.