Enzo Martinelli (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Another aspect of the representation formula is given.
Camillo De Lellis (2017)
Matematica, Cultura e Società. Rivista dell'Unione Matematica Italiana
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``Lo scopo di questa nota è illustrare, nel modo più elementare possibile, la classificazione dei politopi regolari in ogni dimensione, un risultato raggiunto nella metaÁ dell'ottocento dal grande matematico svizzero Ludwig Schlaefli''.
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.
Giuliano Romano, Marco Tonon (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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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.
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.
Guido Lupacciolu (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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General topological conditions are given for integration cycles of a certain class of integral formulas for holomorphic functions of several complex variables.
Guido Lupacciolu (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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General topological conditions are given for integration cycles of a certain class of integral formulas for holomorphic functions of several complex variables.
Roberto Bertolani, Gian Piero Buonagurelli (1975)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Having found no males during three years of breeding in Macrobiotus dispar the parthenogenesis has been demonstrated. The karyological examination has shown that M. dispar has a diploid meiotic and chiasmatic parthenogenesis and the restitutive process takes place at the beginning of the 2nd oocyte division.
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.
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...
Clara Silvia Roero, Tullio Viola (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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This paper discusses from a historical standpoint the incomplete reasoning of Book I proposition 9 of Archimedes' On the sphere and cylinder and gives a proof, which only uses means available to Archimedes himself. This paper also discusses some demonstrations which, through the centuries, have been proposed to solve this problem. One of these is the previously unpublished proof by Jakob I Bernoulli, which is here reported, recently discovered at the Universitätsbibliothek of Basel. ...
Clara Silvia Roero, Tullio Viola (1981)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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This paper discusses from a historical standpoint the incomplete reasoning of Book I proposition 9 of Archimedes' On the sphere and cylinder and gives a proof, which only uses means available to Archimedes himself. This paper also discusses some demonstrations which, through the centuries, have been proposed to solve this problem. One of these is the previously unpublished proof by Jakob I Bernoulli, which is here reported, recently discovered at the Universitätsbibliothek of Basel. ...
Rocek, Martin
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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...
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...
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...
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...
Francesco Gherardelli (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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We define and study the notions of connections and structures of grassmannian type on complex manifolds.
Francesco Gherardelli (1984)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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We define and study the notions of connections and structures of grassmannian type on complex manifolds.
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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Valerio Scali, Paolo Mosti (1975)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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Seven males of the stick insect B. rossius (out of the twenty collected on the Isola del Giglio in July 1974) have shown a chromosomal rearrangement of a definite kind in all the spermatogonia and spermatocytes I which could be analysed in spite of extensive stickiness. Five of them had a pericentric inversion affecting one of the medium sized autosomes (4 heterozygotes and 1 homozygote); this chromosomal rearrangement appears to be the same in the 5 specimens. For one of the heterozygotes...
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...
Caterina Cassisa (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
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This Note completes the research started in a previous Memoir of the author (see Bibliografia [2]), concerning analytical problems connected with plane stresses in Elasticity. The dimension of the spaces of eigensolutions of the relevant problems is computed.
Caterina Cassisa (1982)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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This Note completes the research started in a previous Memoir of the author (see Bibliografia [2]), concerning analytical problems connected with plane stresses in Elasticity. The dimension of the spaces of eigensolutions of the relevant problems is computed.