Showing papers by "University of Palermo published in 1971"
72 citations
TL;DR: In animals with chronically implanted electrodes effective stimulation of the amygdala elicits behavioural phenomena comparable with those of psychomotor epilepsy in man, and the effects of the inhibitory activity of the caudate nucleus on focal paroxysmal phenomena in the limbic system are discussed.
68 citations
TL;DR: In this article, the skeleton vibrations associated to Sn-C and Sn-Cl bonds are consistent with square planar configurations of the organotin(IV) halide moieties, where SnCl3 and C3Sn groups would be T-shaped, and Alk2SnCl2 would have trans-dialkyl, trans-dichloro arrangements.
42 citations
TL;DR: The resin of Espeletia grandiflora contains (-)-kaur-16-en-19-ol, (-)- kaur- 16- en- 19-al (not previously isolated from natural sources), (-)-Kaur-15-ene and (--kaur -16-ene-oic acid.
29 citations
TL;DR: In this paper, the nature of methanol solutions of a series of bis(acetylacetone)ethylenediimine adducts of organotin(IV) halides has been studied by electronic and PMR spectroscopy and by osmometry and conductivity.
27 citations
TL;DR: In this paper, a number of novel compounds of dimethyllead(IV) and diphenyllead (IV) moieties with ligands having a rigid geometry when coordinating, have been prepared and characterized.
20 citations
TL;DR: Analysis of nucleolar RNA of sea urchin gastrulae after in vivo labeling with 32 P, [ 3 H]uridine or l - Me - 3 Hmethionine has revealed two peaks of radioactivity due to RNA's heavier than the mature rRNA, which strongly suggest that the 33 S is the rRNA precursor.
20 citations
TL;DR: In this paper, the properties of bis-(salicylaldoximate)-nickel(II), Ni(salox)2, with pyridine, picolines, cyclomethyleneimines are reported.
19 citations
TL;DR: Evidence is presented that radioactivity from [ Me - 3 H]methionine is incorporated into ribosomal RNA at the gastrula, but not at the hatching blastula stage in Paracentrotus lividus under comparable conditions of isotope utilization.
18 citations
01 Jan 1971
TL;DR: The trivial analogy in the structure of barbiturates and pyrimidines has suggested a series of studies, which were undertaken in the Laboratory since 1961 to investigate on the role of some free nucleotides in cerebral activity.
Abstract: The trivial analogy in the structure of barbiturates and pyrimidines has suggested a series of studies, which were undertaken in our Laboratory since 1961 (Bonavita et al., 1960 to investigate on the role of some free nucleotides in cerebral activity.
12 citations
TL;DR: La stimolazione ripetitiva ad alta frequenza del nucleo caudato inibisce la comparsa sia dei fenomeni bioelettrici parossistici focalizzati nell'amigdala e nella corteccia temporale sia oficiali omologabili all'epilessia psicomotoria.
Abstract: In gatti curarizzati ed in gatti portatori di elettrodi a dimora e liberi di muoversi, la stimolazione ripetitiva ad alta frequenza del nucleo caudato inibisce la comparsa sia dei fenomeni bioelettrici parossistici focalizzati nell'amigdala e nella corteccia temporale sia dei fenomeni comportamentali omologabili all'epilessia psicomotoria.
TL;DR: Adriamycin, a new antitumour drug structurally similar to daunomycin, shows evident spectrophotofluorometric characteristics and a transformation of the molecule was revealed in some organs, using the same technique as for tetracyclines.
TL;DR: The process leading to gene recombination can be interrupted in the filamentous bacteria Streptomyces coelicolor by growing mixed cultures on cellophane disks lying on complete medium, which means some markers can be excluded from heteroclones or from recombinant progeny in early samples.
Abstract: The process leading to gene recombination can be interrupted in the filamentous bacteria Streptomyces coelicolor by growing mixed cultures on cellophane disks lying on complete medium. The mycelium is harvested, broken, diluted and the broken hyphae plated at different time intervals. By this means some markers can be excluded from heteroclones or from recombinant progeny in early samples. The recombinant pattern clearly changes with time, with an increase of markers contributed to the recombinant progeny. In crosses between male (NF) and female (UF) strains, the maleness is the first donor trait to appear in the cells of the recipient parent. The fertility factor does not produce a transfer origin on the donor chromosomes; the donor contribution may extend on either side or on both sides of the factor which appears to be compulsory for zygote formation. The longer the time of contact between parental cells, the longer the segment of the donor chromosome contributing to the recombinant progeny. When spores are formed they contain almost exclusively recombinant nuclei derived from segregation processes.
TL;DR: In this paper, the pulsar NP 0532 in the gamma ray region has yielded evidence of pulsed gamma ray emission for energies up to 10 MeV and up to 150 MeV.
Abstract: OBSERVATIONS of the pulsar NP 0532 in the gamma ray region have yielded evidence of pulsed gamma ray emission for energies up to 10 MeV (refs. 1, 2 and Kurfess, to be published). Above this energy, upper limits between 10 MeV and 150 MeV (refs. 3, 4) and above 50 MeV (ref. 5) are indicated. A result above 70 MeV with phase error of 3 ms with respect to optical signal has been given by a counter experiment6.
TL;DR: Using a pseudopotential approach, an approximate wave function for positron-alkali atom bound state was constructed and a number of physical quantities calculated in this paper, including the electronic densities at the positron and the annihilation rates.
TL;DR: In this article, specific and transport properties of a cation and an anion exchange membrane in Na + and Cl -form respectively have been measured in water and dioxane water mixtures.
TL;DR: Skin sections superimposed on fine-grained photographic plates were exposed to ultraviolet light and the images obtained reproduced the microanatomy of tissue in the process of ultraviolet photoabsorption, which gives information on the content and distribution of these substances in normal and altered tissue.
TL;DR: In this paper, the relaxation process of a system of paramagnetic spins linearly interacting with a phonon field is studied in the region of inverted population of the levels, and the peculiar dynamical behaviour of the present model in that region is shown to be in agreement with some recent experimental results.
TL;DR: The CF test appears to be of particular value in the study of diseases usually associated with low-titre Au antigenemia such as chronic hepatitis and cirrhosis, and also in healthy carriers, as it may give a unique quantitative aetiological parameter for the follow-up of acute or chronic AuA-associated liver disease.
Abstract: 1810 serum samples obtained from 315 patients with various liver diseases, 44 with miscellaneous non-hepatic diseases and 1133 healthy subjects were assayed for Australia antigen by complement fixation (CF) and immunodiffusion (ID) tests.
TL;DR: In this paper, the distributions of PbII, TlI and I− between the strongly basic anion exchange resin Amberlite CG-400 and aqueous solutions of NaSCN and KSCN, were investigated.
Journal Article•
01 Mar 1971
TL;DR: It is demonstrated that isolated nuclei of sea urchin embryos are able to incorporate radioactive nucleotides into RNA.
Abstract: It is demonstrated that isolated nuclei of sea urchin embryos are able to incorporate radioactive nucleotides into RNA. Some properties of the incorporation system are described.
TL;DR: Les résultats montrent that le pouvoir agglutinant et lytique des anticorps IgM est respectivement 37 et 100 fois supérieur à celui des deux classes d'anticorps igG, si l'on calcule les rapports par nombre oficiales.
Abstract: Etude comparative des proprietes biologiques des anticorps IgM, IgG1 et IgG2 du rat. Les resultats montrent que le pouvoir agglutinant et lytique des anticorps IgM est respectivement 37 et 100 fois superieur a celui des deux classes d'anticorps IgG. Par contre, en ce qui concerne le phenomene d'Arthus, les anticorps IgM sont moins actifs que les anticorps IgG, si les rapports sont exprimes en poids. Si l'on calcule les rapports par nombre de molecules, les anticorps IgM sont aussi, dans ce cas, plus actifs que les IgG.
TL;DR: The visual system, like the other sensorial systems, is subjected to intrinsic, complex control, originating both in the retina and in the visual cortex, which regulates its input at various levels of the specific pathways.
Abstract: The visual system, like the other sensorial systems, is subjected to intrinsic, complex control, originating both in the retina (CHANG et al., 1959; ARDUINI and HIRAO, 1960; STERIADE, 1967) and in the visual cortex (BUSER et a/., 1963; JASSIK-GERSCHENFELD and ASCHER, 1963; MEULDERS, 1965), which regulates its input at various levels of the specific pathways. However, the visual system is also influenced by subcortical structures which, though not exerting on it a strictly selective control, determine notable modifications in the level of excitability of the cortical sensorial neurons. It is in fact we11 known that activation of the mesencephalic reticular formation, by increasing the level of cortical excitability, produces a facilitation of the potentials evoked in the visual cortex (BREMER and STOUPEL, 1958 and 1959; DUMONT and DELL, 1958 and 1960; BREMER et al., 1960; FUSTER, 1961; FUSTER and DOCTER, 1962). On the other hand, electrical or chemical stimulation of the ventral pontine reticular formation inhibits the potentials evoked in the specific areas of the cerebral cortex and chemical inactivation of the same pontine area causes their facilitation (COURVILLE et al., 1962; DEMETRESCU and DEMETRESCU, 1962b). Again referring to subcortical control of the sensorial afferences, there is however the more recent demonstration of an inhibitory action by the caudate nucleus on activity evoked in the areas of specific projection (DEMETRESCU and DEMETRESCU, 1962a; DEMETRESCU et al.,
TL;DR: In 2015, esophageal cancer (OC) was the 11th most common cancer with 483,000 new cases and the 7th most commonly cause of cancer-related deaths, with 439,000 deaths as mentioned in this paper.
Abstract: In 2015 esophageal cancer (OC) was globally the 11th most common cancer with 483,000 new cases and the 7th most common cause of cancer-related deaths, with 439,000 deaths. Esophageal cancer is a highly lethal disease of older age, sixth to seventh decades, associated with a remarkable decline in health-related quality of life, high mortality, and poor prognosis with an overall 5-year survival no greater than 20%. The two major histological types, squamous cell carcinoma (SCC) and adenocarcinoma (ADC), while sharing the esophageal site, can be considered like two different neoplastic diseases as they differ in their epidemiology, risk factors, pathogenesis, and treatment. Other malignancies such as carcinosarcoma and various types of sarcoma and lymphoma are rare, with an incidence of less than 1% of all esophageal malignant tumors. The management of esophageal carcinoma requires accurate preoperative staging to stratify patients properly. Esophageal cancer treatment is multimodal so that chemotherapy or chemoradiotherapy integrate surgery is the main mode of treatment of locally advanced cancers for most patients. Unfortunately early spread of esophageal cancer and absence of symptoms in patients with early cancer result in the majority of patients presenting with incurable cancer. The primary treatment for patients with metastatic or unresectable cancer is palliation of dysphagia and maintenance of adequate oral nutrition.