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Displaying similar documents to “Sintesi di RNA in embrioni di Xenopus trattati con LiCl”

Su possibili stati termici della crosta granitica

Luigi Forni (1983)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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Possible thermal states of the granite crust. Apart from transient thermal regiments, the thermal state of the granite crust is solely determined by the flow from the upper mantle and the distribution of radiogenic sources (Birch et alii, 1968). In wiew of this premiss, a study was made of four actual thermal situations to determine both the development of radiogenic heat and that ascribable to the flow from the upper mantle. It was found that: a) the temperature increases caused by...

Su possibili stati termici della crosta granitica

Luigi Forni (1983)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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Possible thermal states of the granite crust. Apart from transient thermal regiments, the thermal state of the granite crust is solely determined by the flow from the upper mantle and the distribution of radiogenic sources (Birch et alii, 1968). In wiew of this premiss, a study was made of four actual thermal situations to determine both the development of radiogenic heat and that ascribable to the flow from the upper mantle. It was found that: a) the temperature increases caused by...

Una teoria-quadro per i fondamenti della matematica

Ennio De Giorgi, Marco Forti (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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We propose a "natural" axiomatic theory of the Foundations of Mathematics (Theory Q) where, in addition to the membership relation (between elements and classes), pairs, sets, natural numbers, n-tuples and operations are also introduced as primitives by means of suitable ground classes. Moreover, the theory Q allows an easy introduction of other mathematical and logical entities. The theory Q is finitely axiomatized in § 2, using a first-order language with a binary relation ∈ (membership)...

Alcune proprietà degli spazi quasi algebrici

Fulvio Lazzeri, Alberto Tognoli (1969)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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A q-algebraic function is an analytic function that is in the algebraic closure of the ring of polynomials. In this work we study the q-algebraic spaces (i.e. the ringed spaces that locally are isomorphic to the locus of zeros of a finite number of q-algebraic functions) and we prove, for instance, that any q-algebraic, compact, connected manifold of 𝐑 n is homogeneous (in the q-algebraic sense).

Una teoria-quadro per i fondamenti della matematica

Ennio De Giorgi, Marco Forti (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Similarity:

We propose a "natural" axiomatic theory of the Foundations of Mathematics (Theory Q) where, in addition to the membership relation (between elements and classes), pairs, sets, natural numbers, n-tuples and operations are also introduced as primitives by means of suitable ground classes. Moreover, the theory Q allows an easy introduction of other mathematical and logical entities. The theory Q is finitely axiomatized in § 2, using a first-order language with a binary relation ∈ (membership)...

Un'osservazione sulle classi di Fitting normali

Guido Zappa (1981)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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We prove that a Fitting class of finite soluble groups is normal if and only if it verifies the condition α ) (see n. 2). Unlike the definition of normal Fitting class, this condition is “constructive”.

Un'osservazione sulle classi di Fitting normali

Guido Zappa (1981)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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We prove that a Fitting class of finite soluble groups is normal if and only if it verifies the condition α ) (see n. 2). Unlike the definition of normal Fitting class, this condition is “constructive”.

Simmetria delle soluzioni di equazioni ellittiche semilineari in R N

Alberto Farina (1999)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

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Nella prima parte di questa Nota si dimostrano dei risultati di simmetria unidimensionale e radiale per le soluzioni di Δ ⁢ u + f ⁢ u = 0 in R N . Questi risultati sono legati a due congetture (De Giorgi, 1978 e Gibbons, 1994) riguardanti la classificazione delle soluzioni dell’equazione Δ ⁢ u + u ⁢ 1 - u 2 = 0 in R N . Si dimostra, in particolare, la seguente generalizzazione della congettura di Gibbons: se N > 1 e se l’insieme degli zeri di u è limitato nella direzione ν , allora u ⁢ x = u 0 ⁢ ν ⋅ x , ovvero, u è unidimensionale. Nella seconda parte...

Ricerca di conformazioni di minima energia potenziale intramolecolare mediante un nuovo metodo di minimizzazione globale.

Camillo Tosi, Raffaella Pavani, Roberto Fusco, Filippo Aluffi-Pentini, Valerio Parisi, Francesco Zirilli (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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A recent method for the global optimization of a real valued function defined in the n -dimensional euclidean space has been applied to the detection of the most stable conformation of a molecule. The method, inspired by the quantum mechanical theory of diffusion across potential barriers, finds the deepest minimum of the intramolecular energy hypersurface by following the asymptotic behaviour of the paths of a system of stochastic differential equations. As an example of its application,...

Sul collasso di un ammasso di materia disgregata. Nota II

Dionigi Galletto (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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With reference to Nota I, the hypothesis that the cluster 𝒰 is spherical is substituted by the hypothesis that it has an isotropic behaviour with respect to a given frame of reference ℐ O with origin in an element O internal to 𝒰 . The kinematical behaviour of 𝒰 during the collapse with respect to the frames of reference with origin in the elements of 𝒰 and in translatory motion with respect to ℐ O is studied. This behaviour is the same with respect to each of such frames, which are in translatory...

Ricerca di conformazioni di minima energia potenziale intramolecolare mediante un nuovo metodo di minimizzazione globale.

Camillo Tosi, Raffaella Pavani, Roberto Fusco, Filippo Aluffi-Pentini, Valerio Parisi, Francesco Zirilli (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Similarity:

A recent method for the global optimization of a real valued function defined in the n -dimensional euclidean space has been applied to the detection of the most stable conformation of a molecule. The method, inspired by the quantum mechanical theory of diffusion across potential barriers, finds the deepest minimum of the intramolecular energy hypersurface by following the asymptotic behaviour of the paths of a system of stochastic differential equations. As an example of its application,...

Sul collasso di un ammasso di materia disgregata. Nota II

Dionigi Galletto (1985)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Similarity:

With reference to Nota I, the hypothesis that the cluster 𝒰 is spherical is substituted by the hypothesis that it has an isotropic behaviour with respect to a given frame of reference ℐ O with origin in an element O internal to 𝒰 . The kinematical behaviour of 𝒰 during the collapse with respect to the frames of reference with origin in the elements of 𝒰 and in translatory motion with respect to ℐ O is studied. This behaviour is the same with respect to each of such frames, which are in translatory...

Sintesi di acidi ribonucleici e di proteine nelle diverse regioni dell'embrione di Xenopus laevis

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...

Ulteriori osservazioni sulla rigenerazione del mesencefalo in Xenopus laevis (Daudin). Istologia del tetto ottico normale e rigenerato

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...

Sulla terminazione nel ponte delle afferenze propriocettive dei muscoli estrinseci dell'occhio

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...

Sottospazi invarianti per operatori lineari T-invarianti rispetto ad un gruppo di omeomorfismi

Lucilla Bassotti Rizza (1986)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti

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Theory of T -invariant linear operators which was considered for a group of congruences [2], [3] is now extended to a group of homeomorphisms. An analysis is carried out in order to establish to what extent the main results of the previous theory still hold under the actual very general assumptions.

Questo numero è primo? Sì, forse, dipende ...

Luisella Caire, Umberto Cerruti (2006)

Bollettino dell'Unione Matematica Italiana

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In this paper we outline some algorithms answering the question if a given number is prime: primally criteria, that are deterministic (they positively reply yes or not) and unconditional, but inefficient (technically not polynomial-time); algoritms that are efficient, but only probabilistic (to say they give absolute certainty if they answer not, whereas they only give a low boundary of the probability for the number to be prime if they answer yes); algorithms that are the same time...

Sottospazi invarianti per operatori lineari T-invarianti rispetto ad un gruppo di omeomorfismi

Lucilla Bassotti Rizza (1986)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Similarity:

Theory of T -invariant linear operators which was considered for a group of congruences [2], [3] is now extended to a group of homeomorphisms. An analysis is carried out in order to establish to what extent the main results of the previous theory still hold under the actual very general assumptions.

Assenza di nucleoside fosfondasi purinica e deficit selettivo grave dei linfociti T

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...

Proprietà e possibile ruolo regolativo della N—formil—tetraidrofolato: metionil-tRNA transformilasi in Euglena gracilis

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...