Showing papers by "University of Naples Federico II published in 1971"
TL;DR: A new C-21 furanoterpene, furospongin-I (III), related to nitenin (I) and dihydronitenin(II), has been isolated from the sponges Spongia officinalis and Hippospongia communis.
56 citations
TL;DR: The overall number of nuclei per mg wet tissue declines between early and late ontogeny; the decline is chiefly in the suboesophageal lobes; in the vertical lobes there is no change in nuclear concentration.
37 citations
TL;DR: Preliminary studies indicate that leucine amide and some di- and tripeptides are rapidly hydrolyzed by brush border membrane prepared from rat small intestine.
34 citations
TL;DR: Angiographic studies made on a group of patients affected by lesions of different nature affecting the petrous portion of temporal bone have shown that the roentgenological visualization of the internal auditory artery offers greater accuracy in diagnosing expanding processes in the region of the ponto-cerebellar angle and opens new horizons for the study of those diseases of the ear.
Abstract: The authors have made a full anatomical description and roentgenological study of the internal auditory or labyrinthine artery. The internal auditory artery seldom arises from the basilar trunk and reaches the inner ear without giving off collateral branches to the cerebellum; more often it originates as a branch of the cerebello-labyrinthine artery near to the internal auditory meatus. The first segment of the internal auditory artery goes through the pontocerebellar cistern (precanalicular or cisternal segment) ending with a slight angle close to the internal auditory meatus; at this level the intracanalicular segment arises and follows the inferior wall of the internal auditory canal with a fluctuating path. Angiographic studies made on a group of patients affected by lesions of different nature affecting the petrous portion of temporal bone have shown that the roentgenological visualization of the internal auditory artery offers greater accuracy in diagnosing expanding processes in the region of the ponto-cerebellar angle and opens new horizons for the study of those diseases of the ear, in the pathogenesis of which a vascular factor plays an important role.
16 citations
TL;DR: In the title compound, the biacetyl bis-(N-methyl, N-phenyl)osazone acts as a tridentate ligand, the nitrogen atoms bonding via the lone pairs as discussed by the authors.
Abstract: In the title compound, the biacetyl bis-(N-methyl,N-phenyl)osazone acts as a tridentate ligand, the nitrogen atoms bonding via the lone pairs.
11 citations
TL;DR: In this paper, the authors extended the wet contaminant test method for use with switching surges and evaluated the performance of five different insulator types under various levels of contamination, including front time and tail time on critical flashover voltages.
Abstract: The "wet contaminant" test method, originally developed for use with alternating voltage, is extended for use with switching surges. In order to evaluate insulators under conditions where dry bands would form, it was found necessary to first energize the contaminated insulators with alternating voltage before applying the surges. Included in the investigation are the effect of front time and tail time on the critical flashover voltages, and a comparison of the switching surge performance of five insulator types under various levels of contamination.
8 citations
TL;DR: It is demonstrated that TAT inactivation proceeds in rat liver homogenates when an acid buffer is used and this inactivation is due to a thermolabile protein system which is probably composed of two components.
5 citations
TL;DR: A ribonuclease from the hepatopancreas of Octopus vulgaris has been purified 900-fold and shows one band upon electrophoresis in polyacrylamide gels and is homogenous with respect to size as shown by analytical ultracentrifugation.
5 citations
01 Jan 1971
TL;DR: In this paper, the influence of geometrical and physical parameters of a contaminating layer on the flashover of small flat surfaces was analyzed using the wet-contaminant method and the alternating and direct flashover voltages were related to different values and distributions of thickness, width and resistivity of the contaminant layer.
Abstract: Tests were carried out to analyse the influence of geometrical and physical parameters of a contaminating layer on the flashover of small flat surfaces. The wet-contaminant method was used, and the alternating and direct flashover voltages were related to different values and distributions of thickness, width and resistivity of the contaminant layer. The results show that the flashover voltage of a polluted strip depends strongly on the surface conductivity and slightly on the layer width and thickness. The nonuniformity of the parameters giving rise to the surface conductivity over the length of the polluting layer does not affect the flashover voltage.
4 citations
TL;DR: From a genetic point of view all these forms of Werdnig-Hoffmann disease should be included into one and the same group.
Abstract: Two members of an Italian family are affected with progressive spinal muscular atrophy. One, a male, has had the disease since his early infancy and, though severely disabled, is still living at the age of 13. In his sister, the first symptoms appeared at the age of 15, and the disease seems to be rapidly advancing. Their parents were consanguineous. Their mother, however, married twice, her second marriage being nonconsan-guineous and producing no affected children. The study of this family and an analysis of the literature led to the following conclusions: (a) early onset of the disease does not necessarily mean that the course will be malignant; (b) the disease usually has a similar onset and course in subjects belonging to the same family. In many families, however (and these have been examined in the present paper) malignant Werdnig-Hoffmann disease is found to coexist with the Werdnig-Hoffmann disease with a prolonged course, the Wohlfart-Kugelberg-Welander disease with infantile onset, and the Wohlfart-Kugelberg-Welander disease with juvenile onset. We feel, therefore, that from a genetic point of view all these forms should be included into one and the same group.
3 citations
TL;DR: In this article, a modified version of the discrete maximum principle is used for the optimal determination of the switching points and input vectors for a given curve, where each point satisfies a linear differential equation of a general type with input vector constant in each interval.
Abstract: A given curve is approximated by a sequence of arcs pieced together continuously in such a way that each arc satisfies a linear differential equation of a general type with input vector constant in each interval. A computer algorithm based on a modified version of the discrete maximum principle for the optimal determination of the switching points and input vectors is outlined.
Journal Article•
TL;DR: The trichogrammatid Chaetostricha miridiphaga spec.
Abstract: Chaetostricha miridiphaga spec. nov. (Hymenoptera: Chalcidoidea), reared from eggs of Lygidolon laevigatum Reut. (Hemiptera: Miridae), is descriptionbed and figured. Dr D. P. Annecke, Plant Protection Research Institute, Pretoria, submitted to me for determination a trichogrammatid reared from eggs of Lygidolon laevigatum Reut. (Hemiptera: Miridae). It represents an interesting new species of the genus Chaetostricha Walk. and is descriptionbed here.
01 Jan 1971
01 Jan 1971
TL;DR: In this article, the slip theory of elasto-plastic buckling of structures is studied and a brief outline of its developments is given. But it is not clear how to evaluate the plastic response of the strain-hardening materials under a sudden change of loading and the real difficulties hide.
Abstract: The formulation of a theory of elasto-plastic buckling of structures is a research of a theoretical and applied interest. Such a problem requires the evaluation of the plastic response of the strain-hardening materials under a sudden change of loading and here the real difficulties hide. Next we sketch a brief outline of the slip theory and of some of its developments. In fact, to our opinion, for the aim of this research the slip theory seems to be sufficiently precise in its predictions.
TL;DR: Daily administration of betamethasone antagonized both the thinning of the strands of the adrenaline-storing cells and the enlargement of the vascular sinuses and the relative ratio adrenaline/noradrenaline-stored cells is decreased.
01 Jan 1971
TL;DR: In this article, the authors present an introductory discussion of the phenomena of buckling and instability of plastic structures, making use of elementary models with a limited number of degrees of freedom and of the associated yield profiles (yield loci).
Abstract: This paper presents an introductory discussion of the phenomena of buckling and instability of plastic structures, making use of elementary models with a limited number of degrees of freedom and of the associated yield profiles (yield loci). It is in fact felt that yield profiles have been unjustly neglected in this field (one exception worth remembering is a so far little-noticed paper by Boyce [1]), while they have been an essential tool in the development of the general theory of plastic structures and continua, where their use made it possible to overcome many of the mathematical difficulties arising from the non-uniform constitutive laws.
TL;DR: It is concluded that the depletion of adrenaline by AMG is indirect and must be considered functional and the fall of adrenal steroids in the blood perfusing the medulla is likely to exert a permissive role in the depletion.
01 Jan 1971