Showing papers by "University of Palermo published in 1984"
TL;DR: Oxygen isotope analyses of water in blood of humans and domestic pigs indicate that the oxygen isotope fractionation effects between ingested water and body water are the same in all specimens of the same species as mentioned in this paper.
929 citations
TL;DR: In this paper, the authors studied the existence of nontrivial solutions for the boundary value problem, where λ is a real parameter and Δ is the relative Laplace-Beltrami operator.
Abstract: In this paper we study the existence of nontrivial solutions for the boundary value problem { − Δ u − λ u − u | u | 2 ⁎ − 2 = 0 in Ω u = 0 on ∂ Ω when Ω⊂Rn is a bounded domain, n ⩾ 3, 2 ⁎ = 2 n ( n − 2 ) is the critical exponent for the Sobolev embedding H 0 1 ( Ω ) ⊂ L p ( Ω ) , λ is a real parameter. We prove that there is bifurcation from any eigenvalue λj of − Δ and we give an estimate of the left neighbourhoods ] λ j ⁎ , λj] of λj, j∈N, in which the bifurcation branch can be extended. Moreover we prove that, if λ ∈ ] λ j ⁎ , λj[, the number of nontrivial solutions is at least twice the multiplicity of λj. The same kind of results holds also when Ω is a compact Riemannian manifold of dimension n ⩾ 3, without boundary and Δ is the relative Laplace-Beltrami operator.
148 citations
82 citations
TL;DR: The results of the study suggest that treatment of peripheral occlusive vascular disease by a drug improving blood fluidity through correction of hemorheological and hemostasiological factors turns especially promising and beneficial since the action centers finally on the languishing microcirculation in the ischemic tissue.
Abstract: The effect of a 3 month daily administration of 800 mg pentoxifylline (Trental 400 bds) or placebo was assessed under double blind crossover design in 18 patients (12 males and 6 females) with peri...
75 citations
TL;DR: In this paper, the authors presented the calcareous nannofossil biostratigraphy of the Capo Rossello section (Sicily), which suggests that a sedimentary gap exists at the contact between the Trubi and the overlying Monte Narbone Formation, close to the top of the proposed Zanclean stratotype.
73 citations
14 May 1984
72 citations
69 citations
TL;DR: In this article, the concentration of pentanol in the ternary system was analyzed using a mass-action model for the alcohol distribution in micellar solutions and the partial molar volume of alcohol bound to the micelles and the ratio between the binding constant and the aggregation number of the surfactant were calculated.
Abstract: Densities of the ternary system water-sodium dodecylsulfate (NaDS)-pentanol and of the binary systems butanol-octane and pentanol-octane were measured at 15, 25, and 35 °C. The apparent molar volume of pentanol in the ternary system was analyzed using a mass-action model for the alcohol distribution in micellar solutions. The partial molar volume of alcohol bound to the micelles and the ratio between the binding constant and the aggregation number of the surfactant are calculated. The partial molar volume binding constant, is discussed in terms of solubilization sites of the alcohol in the micelles whereas the binding constant is compared with that derived from the Nernstian partition constant previously obtained calorimetrically. From the binding constant and Poisson statistics the distribution function of the number of alcohol molecules per micelle, as a function of the concentration of alcohol and of surfactant, are calculated. The derived distribution functions show that a large amount of alcohol can be solubilized in the micelles so that alcoholic mixed micelles can be predicted when the concentration of pentanol is greater than that of NaDS.
56 citations
TL;DR: In this paper, structural properties of LDPE samples were investigated for various periods both in the absence and the presence of a light stabilizer system, taking into account previous structural results for the same samples.
40 citations
TL;DR: In this paper, the 1-amino-3-one-1-butenyl complexes trans-PdCl{C(NHR)CHCOMe}(PPh 3 ) 2 ] (IIa, R = p -C 6 H 4 OMe; IIb, Me) were characterized by IR, 1 H and 31 P NMR spectra.
39 citations
TL;DR: The results support the view that there is an occupational risk factor related to a rural environment in blood donors from Palermo and Mussomeli and Ustica that is related to Rickettsia conorii.
Abstract: 963 sera from contacts, persons from various localities, and blood donors were examined with a commercially produced kit for micro-immunofluorescence for the presence of antibodies to Rickettsia conorii . 10·6% of sera were serologically positive. The higher rates of positivity were observed in sera of contacts (19%) and persons from Mussomeli (20%) and Ustica (18·4%), the lower rates in blood donors from Palermo (3·5%). These results support the view that there is an occupational risk factor related to a rural environment.
TL;DR: IgA-ICs were found to be associated with the presence of microangiopathy, suggesting that they may play a role in the pathogenesis of the late diabetic complications.
TL;DR: The data point to the occurrence of different immunoregulatory abnormalities in newly diagnosed Type 1 diabetic patients, especially in OKT8+ and OKT4+ cells, further proof of the role of cellular autoimmunity in the pathogenesis of the early phases of Type 1 diabetes.
Abstract: Humoral and cell-mediated disorders in Type 1 (insulin-dependent) diabetes suggest that an imbalance of immunoregulatory T-cell subsets exists In 23 newly diagnosed (onset < 3 months) and 21 long-standing Type 1 diabetic patients, T lymphocyte subsets were analyzed using monoclonal antibodies (OKT3, OKT4, OKT8, OKM1) The newly diagnosed patients showed a reduction with a significant difference from healthy controls in total T cells (OKT3+: 581 ±85% versus 707±80%), helper/inducer cells (OKT4+: 338 ±70% versus 471 ±83%), suppressor/cytotoxic cells (OKT8+: 185±73% versus 32 ± 68%) and monocytes (OKM1+: 115±38% versus 199±52%) (p< 0001) The long-standing diabetic patients also revealed a low number of immunoregulatory T cells compared with control subjects, although to a lesser extent (p< 001–005) The helper/suppressor ratio (OKT4+/OKT8+) was higher in newly diagnosed patients than in control subjects (22±13 versus 15±03; p< 002) When compared with 95% tolerance limits in the control subjects, the reduction of OKT8+ cells in the newly diagnosed diabetic patients appeared more marked: the mean (185%) coincided with the lower limit of normal subjects (183%) Ten of the newly diagnosed Type 1 diabetic patients had a value below the normal lower limit Our data point to the occurrence of different immunoregulatory abnormalities in newly diagnosed Type 1 diabetic patients, especially in OKT8+ and OKT4+ cells The imbalance in T lymphocyte subsets is further proof of the role of cellular autoimmunity in the pathogenesis of the early phases of Type 1 diabetes
TL;DR: Lip cancer was significantly associated with fair, brown, or red hair, and association with tobacco smoking was not significant after adjustment for socioeconomic status; risk increased exponentially with the number of ethnic characteristics of northern European populations.
Abstract: Incidence rates of lip cancer in males in Ragusa (Sicily) are amongst the highest in Europe [age-standardized rate (world) for 1980-82: 7.5 per 100,000]. A case-control study was conducted on 53 male cases and 106 controls matched for sex, age (+/- 2 1/2 years), residence and hospital from which cases had been drawn. Individual interviews were carried out for the evaluation of ethnic, environmental, pathologic and occupational risk factors. Lip cancer was significantly associated with: fair, brown, or red hair (relative odds = 2.3), blue eyes (r.o. = 5.3), fair skin (r.o. = 8.0), sensitivity to sunburns (r.o. = 4.1), working outdoors (r.o. = 4.9), coexistence of non-specific lesions of exposed body parts (r.o. = 12,2), low socioeconomic status (r.o. = 15.8), farming (r.o. = 2.6) and working in greenhouses (r.o. = 12.0). Recall of recurrent Herpes labialis was not significantly associated; also association with tobacco smoking was not significant after adjustment for socioeconomic status. Risk increased exponentially with the number of ethnic characteristics of northern European populations.
TL;DR: In this article, a stable step-by-step procedure is proposed to evaluate the mean square response of a linear system with several degrees of freedom, subjected to earthquake ground motion.
TL;DR: No functional localization of the effects of claustrum activation were found within the motor areas and the observed results are consistent with the hypothesis that the claustrums may play a role in movement organization.
TL;DR: In this paper, the dynamic shakedown of discrete elastic-perfectly plastic structures under a specified load history is studied using the dynamic characteristics of the structure provided by modal analysis.
Abstract: Dynamic shakedown of discrete elastic-perfectly plastic structures under a specified load history is studied using the dynamic characteristics of the structure provided by modal analysis. Several statical and kinematical theorems are presented, including lower and upper bound theorems for the minimum adaptation time of the structure. In the formulation of the kinematical theorems a crucial role is played by the appropriate definition of ≪admissible plastic strain cycle≫.
TL;DR: Carboxylation par CO 2 de chloro-1 propane, -butane, α-chlorotoluene, dichlorobenzene, chloro 1 naphtalene et chloro -1p ethylbenzene en presence d'une anode de Al dans DMF-bromure de tetrabutylammonium as mentioned in this paper.
Abstract: Carboxylation par CO 2 de chloro-1 propane, -butane, α-chlorotoluene, dichlorobenzene, chloro-1 naphtalene et chloro-1p ethylbenzene en presence d'une anode de Al dans DMF-bromure de tetrabutylammonium
TL;DR: In this article, the clectrocarboxylation of benzal chloride to -chlorophenylacetic and phenylmalonic acids is realized in diaphragmless cells with aluminium sacrificial anodes.
TL;DR: In this article, a Reducing Capacity (RC) monitoring unit was installed at Soffione, the most active fumarole in the Solfatara system, and the measured CH4 content at an extimated depth of 3.5 km.
Abstract: Geochemical surveillance of the Phlegraean Fields area has been intensified since 1983, in response to the increased uplift rate (brady-seismic activity). Fumarolic gases from Solfatara (Pozzuoli) were sampled and analyzed monthly. A Reducing Capacity (RC) monitoring unit was installed at Soffione, the most active fumarole in the Solfatara system. The preliminary analysis of the RC temporal variations suggest they are consistent with the rate of the seismic energy release. The composition of fumarolic gases indicates that the equilibrium temperature and pressure are higher than those of sampling. The observed variations in CH4 content are explained as an increase of pressure (from 1982 to the end of 1983) of about 70% at an extimated depth of 3–3.5 km. Finally, during 1983, there were no geochemical indications of both rising magma and significant accumulation of energy at shallow depth.
TL;DR: Chromosome studies of five patients with myelofibrosis and myeloid metaplasia were carried out on bone marrow cells and/or on peripheral blood without PHA, finding one patient, a woman aged 75, showed a constitutional karyotype 46,XX,inv(5)( p15q11 ).
TL;DR: In this article, the influence of the nature and chemical composition of the starting material, pH and concentration of the mineralizing agent (NaOH) and reaction temperatures and time on the zeolitization process is discussed and compared to the performance of Lipari pumice.
TL;DR: Exploitation des consequences de la thermodynamique generalisee en appliquant ses equations a un gaz de Bose degenere ou la condensation de Boses-Einstein a lieu as discussed by the authors.
Abstract: Exploitation des consequences de la thermodynamique generalisee en appliquant ses equations a un gaz de Bose degenere ou la condensation de Bose-Einstein a lieu. Formes particulieres de ces equations, qui gouvernent la dissipation, pour 4 He. Equation du second son
TL;DR: Electrophysiological relationships between the claustrum and the motor cortex were studied in cats preliminarily anesthetized with ketamine and then with chloralose and the results show a functional linkage between the confusional structure and the efferent cells of the Motor cortex.
TL;DR: In this article, a new irregular, monocyclic diterpene, bonandiol (1), has been isolated from Bonannia graeca and the structure of the structure has been deduced from spectral data and chemical evidence.
TL;DR: In this paper, the authors measured the H2O, CO2 and H2S outputs at the Solfatara of Pozzuoli and a map of the exhaling areas has also been made.
Abstract: The H2O, CO2 and H2S outputs at the Solfatara of Pozzuoli have been measured and a map of the exhaling areas has also been made. The energy released at the surface by the fluids has been estimated to be 1019 ergs/day. The presence of aquifers at Phlegraean Fields increases the phreatic and phreatomagmatic explosion risk. Our results suggest that even if an uprising magma may interact with water at depth, an explosion could occur only at the shallow levels of a few hundred meters. Since the transfer of energy toward the surface is favoured by the presence of fractures, a detailed analysis of the deep fracture network would help to evaluate the risk levels of the various areas of Phlegraean Fields.
TL;DR: A number of new complexes of R 2 Sn IV with adenosine, guanosine, inosine, cytidine and uridine were synthesized by reaction of ribonucleosides with diorganotin oxide in hot methanol as mentioned in this paper.
TL;DR: The endocrine study showed in most patients a gonadotropin behaviorsimilarto that observed inclassical polycystic ovary (PCO) syndrome and Prolactin levels were slightly increased in basal conditions and presented an exaggerated response to TRH stimulation.
Abstract: We describe 5 adult women with severe hirsutism due to late onset 21-hydroxylase deficiency. Diagnosis was performed on the finding of high serum 17-hydroxyprogesterone (170HP) levels with a marked hyperresponse to an ACTH test. The endocrine study showed in most patients a gonadotropin behaviorsimilarto that observed inclassical polycystic ovary (PCO) syndrome. Prolactin levels were slightly increased in basal conditions and presented an exaggerated response to TRH stimulation.
TL;DR: In this paper, the fault-tree construction algorithm was tested with a real control system and was found to be generally good (with minor discrepancies) for proportional controllers, but somewhat lacking if integral control action is used.
TL;DR: It was concluded that the most accurate screening plain in cirrhotic patients suspected of having HCC with alpha‐fetoprotein values below 500 mg/ml would consist of ultrasonography followed, as clinically indicated, by ultrasonographic or laparoscopic guided biopsy.
Abstract: A total of 67 cirrhotic patients with clinically suspected neoplastic degeneration and low alpha-fetoprotein levels were assessed prospectively with ultrasound and gold (198Au) scintigraphy. Ultrasound showed space-occupying lesions in 22 of the 24 patients who had a final diagnosis of hepatocellular carcinoma (HCC) (sensitivity, 95.8%) and excluded the presence of HCC in 37 of the 43 patients with cirrhosis only (specificity, 86.0%; efficiency, 90.8%). Scintigraphy demonstrated a cold defect in 22 of the 24 patients who had a final diagnosis of HCC (sensitivity, 95.8%) and excluded the presence of HCC in 22 of the 43 patients with cirrhosis only (specificity, 51.1%; efficiency, 69.8%). It was concluded that the most accurate screening plain in cirrhotic patients suspected of having HCC with alpha-fetoprotein values below 500 mg/ml would consist of ultrasonography followed, as clinically indicated, by ultrasonographic or laparoscopic guided biopsy.