Search results for "SEGR"

Differential competitive ability between sexes in the dioecious Antennaria dioica (Asteraceae)

2012

† Background and Aims Differences in competitive ability between the sexes of dioecious plants are expected as a result of allocation trade-offs associated with sex-differential reproductive costs. However, the available data on competitive ability in dioecious plants are scarce and contradictory. In this study sexual competition was eval- uated using the dioecious plant Antennaria dioica in a common garden transplantation experiment. † Methods Male and female plants were grown for 3 years either in isolation, or in competition with a plant of the same sex or the opposite sex. Flowering phenology, sexual and asexual reproduction, plant growth, nutrient content and arbuscular mycorrhizal col…

Deepen Into the Social Segregation of Secondary Schools in the Community of Madrid

2021

Recientes estudios han mostrado que la segregación escolar por nivel socioeconómico en la Comunidad de Madrid es muy alta, la más alta de España, y una de las más elevadas de Europa. Esta investigación profundiza en el conocimiento de la segregación escolar por nivel socioeconómico en educación secundaria con datos recientes mediante la consecución de tres objetivos: a) estimando su magnitud con diversas estrategias, calculando su perfil para 19 grupos minoritarios y comparándola con otras Comunidades; b) estudiando el papel de los centros públicos, privados concertados y no concertados; y c) determinando la aportación del programa de bilingüismo a la segregación. Se realiza una explotación…

The distribution of sexual reproduction of the geographic parthenogenEucypris virens(Crustacea: Ostracoda) matches environmental gradients in a tempo…

2013

Niche segregation may prevent competitive exclusion and promote local coexistence. This typically results in the occupation of different habitats. In the freshwater ostracod Eucypris virens (Jurine, 1820), the distribution of sexual and parthenogenetic populations in the temporary Lake Caracuel, central Spain, was not homogeneous. Parthenogens were found everywhere including the littoral, whereas sexuals were restricted to the centre. We investigated the hypothesis that spatial distribution responded to ecological differences. We studied the ecological significance of this segregation by linking environmental data to male presence, sexual fraction, ploidy, and genetic structure of our model…

Topoisomerase II inhibition and high yield of endoreduplication induced by the flavonoids luteolin and quercetin

2006

Luteolin and quercetin are widely distributed plant flavonoids that possess a variety of chemical and biological activities, including free-radical scavenging and antioxidant activity. Recently, both flavonoids have been reported to inhibit DNA topoisomerases I and II (topo I and topo II), a property that, together with their ability to induce DNA and chromosome damage, has made them candidate anticancer compounds. In the present study, we confirmed that both compounds are topo II inhibitors by conducting a comparative study of their effect on topo II activity from Chinese hamster ovary AA8 cells. Because interference with the function of topo II to resolve DNA entanglement at the end of re…

The Segre embedding of the quantum conformal superspace

2018

In this paper study the quantum deformation of the superflag Fl(2|0, 2|1,4|1), and its big cell, describing the complex conformal and Minkowski superspaces respectively. In particular, we realize their projective embedding via a generalization to the super world of the Segre map and we use it to construct a quantum deformation of the super line bundle realizing this embedding. This strategy allows us to obtain a description of the quantum coordinate superring of the superflag that is then naturally equipped with a coaction of the quantum complex conformal supergroup SL_q(4|1).

From the theory of “congeneric surd equations” to “Segre's bicomplex numbers”

2015

We will study the historical pathway of the emergence of Tessarines or Bicomplex numbers, from their origin as "imaginary" solutions of irrational equations, to their insertion in the context of study of the algebras of hypercomplex numbers.

Some families of big and stable bundles on $K3$ surfaces and on their Hilbert schemes of points

2021

Here we investigate meaningful families of vector bundles on a very general polarized $K3$ surface $(X,H)$ and on the corresponding Hyper--Kaehler variety given by the Hilbert scheme of points $X^{[k]}:= {\rm Hilb}^k(X)$, for any integer $k \geqslant 2$. In particular, we prove results concerning bigness and stability of such bundles. First, we give conditions on integers $n$ such that the twist of the tangent bundle of $X$ by the line bundle $nH$ is big and stable on~$X$; we then prove a similar result for a natural twist of the tangent bundle of $X^{[k]}$. Next, we prove global generation, bigness and stability results for tautological bundles on $X^{[k]}$ arising either from line bundles…

Zemes un vides zinātnes

2011

Approvvigionamento di flussi e dati tramite il dispositivo telefonico altrui

2019

Il contributo affronta il tema delle indagini digitali tramite dispositivo telefonico. Ci si chiede mediante quali mezzi di ricerca della prova si possono acquisire tutte le informazioni utili alle indagini contenute in un telefono cellulare e se, per il buon esito delle stesse, sia consentito servirsi incondizionatamente del dispositivo, procedendo a una immediata ispezione o perquisizione, ovvero se non sia più opportuno che l'apparecchio venga sottoposto a sequestro e, con l'ausilio di esperti, procedere all'analisi e all'acquisizione dei dati ivi contenuti mediante un accertamento tecnico che, in molti casi, può assumere il connotato della irripetibilità. Ci si chiede, inoltre, se è rag…

Persistence of Occupational Segregation: The Role of the Intergenerational Transmission of Preferences

2007

This article provides an explanation of the evolution and persistence of the women's segregation in jobs with less on-the-job training opportunities within the framework of an overlapping generations model with intergenerational transmission of preferences. ‘Job-priority’ and ‘family-priority’ preferences are considered. Firms’ policy and the distribution of women's preferences are endogenously and simultaneously determined in the long run. The results show though the gender gap in training will diminish, it will also persist over time. This is because both types of women's preferences coexist at the steady state due to the socialisation effort of parents to preserve their own cultural valu…