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Giambattista Scarpi (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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The development of velocity distribution in plane laminar flow is examined, neglecting inertial terms in respect to viscous ones. A solution is given, which satisfies all boundary conditions.
Attilio Adami (1983)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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The flow inside the hydraulic jump is interpreted in terms of diffusion of a two-dimensional turbulent jet. The classical theoretical-experimental results of turbulent diffusion can be consequently utilized and, on the basis of continuity and momentum equations, the water depth and the distribution of flow velocity for any cross section are shown to be determined for given Froude number of upstream flow.
Attilio Adami (1983)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The flow inside the hydraulic jump is interpreted in terms of diffusion of a two-dimensional turbulent jet. The classical theoretical-experimental results of turbulent diffusion can be consequently utilized and, on the basis of continuity and momentum equations, the water depth and the distribution of flow velocity for any cross section are shown to be determined for given Froude number of upstream flow.
Annastella Gambini, Paolo Crosti, Paolo Tortora, Giovanni Lucchini, Renato Bianchetti (1974)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The properties of N-formyl-tetrahydrofolate: methionyl-tRNA transformylase from Euglena gracilis were studied and compared with those of the E. coli enzyme. The Euglena enzyme, functioning in formylation of met-tRNA initiator of organellar protein synthesis, shows a partial requirement of Mg, with an optimum of 5 mM, stimulation by K, Km for N-formyl-THFA 2.5 x 10 M. These properties are different from those of the bacterial enzyme. For example the affinity for the substrate N-formyl-THFA...
Anna Stagni (1973)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The ultrastructural aspects of some cellular types in Aelosoma have been investigated. Aelosomatidae are aquatic Oligochaetes in which the asexual reproduction isvery common, while sexual individuals are rare or, in some species, have never been observed. Asexual reproduction occurs by fission and regenerative processes precede the separation of the daughter zooid. In this work are described the ectodermal cells of the parent's body (including gland cells) and the blastematic cells of...
Giovanni Palmieri, Rolando Marini, Ermanno Manni (1972)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Cells responsive to stretching individual eye muscles were identified electrophysiologically in the medial dorso-lateral part of the semilunar ganglion of the Lamb. The destruction of such a cellular pool was followed by degeneration of some spindles in those eye muscles whose stretch had elicited responses of the gasserian cells and of some nervous fibers in the ophthalmic branch, in the sensory trigeminal root and in the ipsilateral descending trigeminal tract. The degenerations ended...
Giorgio Maria Innocenti, Tullio Manzoni (1973)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Intracellular records were obtained from 31 neurones isolated from the first somatosensory cortical projection area of chloralose-anaesthetized cats. These neurones, which are part of a wider sample of 197 cells recorded extracellularly during the same experiments, were all tested with the electrical stimulation of peripheral receptive fields (PRF) and hence classified as somatotopic (contralateral, specific PRF) or non-somatotopic (wide and bilateral PRF). Upon PRF shocks, sequences...
Luigi Stazi (1986)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The intrinsically conservative dynamics of a particle with scalar structure are considered; it is known that in terms relative to an arbitrary Galilean frame of reference the problem is resolved by a canonical system with non-singular hamiltonian also involving the external field.
Luigi Stazi (1986)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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The intrinsically conservative dynamics of a particle with scalar structure are considered; it is known that in terms relative to an arbitrary Galilean frame of reference the problem is resolved by a canonical system with non-singular hamiltonian also involving the external field.
Brunello Bedosti, Michele Caputo (1986)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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The first catalogue of tsunamis of the Italian coasts (Caputo, Faita 1984) is updated to include the information contained in the chronicles of natural phenomena recently found. Events which have not been reported in the previous catalogue are here listed with decimals, new information on events appearing in the previous catalogue are listed with the same number. Events in the Aegean sea which may have caused tsunamis on the Italian coast are also reported; they may be useful for further...
Brunello Bedosti, Michele Caputo (1986)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The first catalogue of tsunamis of the Italian coasts (Caputo, Faita 1984) is updated to include the information contained in the chronicles of natural phenomena recently found. Events which have not been reported in the previous catalogue are here listed with decimals, new information on events appearing in the previous catalogue are listed with the same number. Events in the Aegean sea which may have caused tsunamis on the Italian coast are also reported; they may be useful for further...
Sergio Filoni, Vito Margotta, Giancarlo Gibertini (1971)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The histology of normal and regenerated optic lobes was examined in young specimens of Xenopus laevis by applying the Golgi-Cox method. In the operated animals the unilateral ablation of the optic lobe has been performed at the early larval stages (48-51) and at the later larval stages (55-56), according to Nieuwkoop and Faber. From our observations we drew the following conclusions: 1) The histological features of the optic tectum of Xenopus laevis are essentially similar to those of...
Anna Stagni, M. Luisa Sini-Rubatta, Vincenza Morini (1980)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Observations prolonged for two months show how aged Aelosoma viride specimens increase their asexual reproductive power. Treatment of this species with some neuropharmacological agents (norepinephrine, amphetamine, reserpine) demonstrate that: 1) noradrenaline excites the growth by increasing the number of segments; 2) amphetamine excites the growth but inhibits asexual reproduction; 3) reserpine is strongly toxic; 4) growth and asexual reproduction appear as two partially separated...
Cataldo Agostinelli (1958)
Bollettino dell'Unione Matematica Italiana
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Rocek, Martin
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Marisa Leonardi Cigada, Fiorenza Laria De Bernardi, Anna Maria Scarpetti Bolzern (1975)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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An analysis of RNA and protein synthesis has been carried out on Xenopus laevis embryos, cut into two portions, during the early stages of their development. Actinomycin D was employed to inhibit the synthesis. The action of actinomycin on synthesis is stronger during gastrulation than during neurulation. In each stage a correlation between RNA synthesis inhibition and protein synthesis inhibition has been observed. In the ventral fragments of the neurula the ratio between the two inhibitions...
Raffaele Casnedi, Sergio Mosna (1970)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In the southwestern part of the Tertiary Basin of Piedmont (near Mondovi-Cuneo), the presence of a thick sequence of lower Miocene has been recognized. The lithological and micropaleontological peculiarities have been described, emphasizing the variations in the sedimentation environments during this Epoch; a typical littoral deposition is followed, during the Langhian, by a neritic facies.
Daniela Esu (1980)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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An Upper Pleistocene (post-“Ostian”) fossiliferous outcrop rich in lacustrine molluscan fauna has come to light near Rome (Flaminia Road). Before in the same tufaceous layer some remains of a steppe-elephant and a deer were also discovered. The molluscan fauna is formed by 8 lacustrine and 4 terrestrial species; they indicate a climate colder than present and open environment without arboreous vegetation or with rare restricted woody land.
Luigi Amerio (1965)
Bollettino dell'Unione Matematica Italiana
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Giorgio Maria Giacometti, Alvaro Da Ros, Maurizio Brunori (1973)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The paper reports a study on the kinetics of the transition between acid and alkaline Aplysia myoglobin. The results, obtained with the temperature-jump method, show that the observed relaxation effect corresponds to a perturbation of the equilibrium between the protonated and deprotonated forms of the protein. The pH dependence of the data and their analysis suggest that the process involves a proton-linked conformational change of the protein, in agreement with independent experiments....
Rosa Maria Corbo (1979)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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We studied a 22 months-old girl with severe selective T-cell deficiency and no measurable purine nucleoside phosphorylase activity in the RBC and granulocytes. No inhibitor was found in the patient's erythrocytes. Her parents are second cousins and their red cells exhibited about half the normal level of NP activity. The identification of heterozygotes within a three generation pedigree confirms that PNP deficiency is inherited as a mendelian autosomal trait and that erythrocytes can...
Dionigi Galletto, Bruno Barberis (1985)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Starting from the considerations developed in [4], it is shown that the only forces at a distance exerted among the elements of an isolated spherical cluster of incoherent matter which, preserving homogeneity, is collapsing are those expressed by Newton's law of gravitation and those of the elastic type. Furthermore the reverse is shown, that is if the forces at a distance are of these two types during the collapse the homogeneity is preserved.
Dionigi Galletto, Bruno Barberis (1985)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Starting from the considerations developed in [4], it is shown that the only forces at a distance exerted among the elements of an isolated spherical cluster of incoherent matter which, preserving homogeneity, is collapsing are those expressed by Newton's law of gravitation and those of the elastic type. Furthermore the reverse is shown, that is if the forces at a distance are of these two types during the collapse the homogeneity is preserved.
Roberto Bertolani (1972)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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The chromosome morphology and number in somatic and germinal mitoses were studied in some species of Macrobiotus. Most of these species (M. areolatus, M. coronifer, M. harmsworthi, M. hufelandii and bisexual biotype of M. richtersi) have 2n = 12 chromosomes, but in two acquatic species with similar morphology (M. dispar and M. pullari) 2n = 10 chromosomes are found. The chromosome number in males and females of M. areolatus and M. richtersi is the same. In the ripening oocytes and in...
Domenico Fusco (1980)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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In this paper we determine a class of first order quasi-linear hyperbolic systems in conservative form involving two independent and two dependent variables which are not deducible, in general, from a variational principle but can be reduced to a Godunov’s symmetric form [5], [6] where the coefficient of the field spatial derivative is a constant matrix. That enables us to extend to these systems several results obtained by G. Boillat in [8], [9] and concerning with shocks in quasi-linear...
Giuliano Romano, Marco Tonon (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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An ancient settlement at Veronella Alta (Verona) has been examined with respect to the astronomical orientation. The principal axis of the construction (in form of an egg) is directed to the azimuth of the sunrise at the winter solstice. A possible geometric method for the construction of the plan of the settlement has been investigated.