Search results for "Segregation"

Structural features of selected protic ionic liquids based on a super-strong base

2019

Protic ionic liquids (PIL) were prepared from a super-strong base 1,7-diazabicyclo[5.4.0]undec-7-ene (DBU) and super-strong acids, trifluoromethane sulfonic acid (TfOH), and (trifluoromethanesulfonyl)-(nonafluorobutylsulfonyl)imide, (IM14H), ([DBUH][TfO] and [DBUH][IM14], respectively; the latter for the first time) and their chemical and physical properties and structural features have been explored using a synergy of experimental and computational tools. The short range order in neat DBU, as well as the long range structural correlations induced by charge correlation and hydrogen bonding interactions in the ionic liquids, have been explored under ambient conditions, where these compounds …

Very high titanium content mesoporous silicas

2001

Titanium content in mesoporous titanosilicate catalysts has been modulated up to a minimum Si/Ti value of 1.9 by using complexing agents able to coordinate both Si and Ti atoms and harmonize the reactivity of the resulting precursors avoiding subsequent phase segregation and leading to chemically very homogeneous materials. El Haskouri, Jamal, Jamal.Haskouri@uv.es ; Beltran Porter, Aurelio, Aurelio.Beltran@uv.es ; Beltran Porter, Daniel, Daniel.Beltran@uv.es ; Amoros del Toro, Pedro Jose, Pedro.Amoros@uv.es

Grasslands and Shrublands of the Mediterranean Region

2020

The Mediterranean Region extends to the 1.6% of the world’s land surface and more than the half of the Mediterranean-type ecosystems of the world. The remarkable species richness in the Mediterranean Region mainly originates from an exceptional habitat diversity and the presence of several natural barriers facilitating the segregation and differentiation of local taxa and biocoenoses. In this article, we deal with the habitats characterized by grasslands and shrublands that clearly show the adaptations to what could be called “the Mediterranean syndrome”, i.e., the intrazonal Mediterranean grasslands and shrublands (MG&S). The main driving forces of the adaptive radiation and high biodi…

Unravelling diet composition and niche segregation of colonial waterbirds in a Mediterranean wetland using stable isotopes

2021

Lifestyle-Induced Microbial Gradients: An Indian Perspective

2019

Introduction: Urbanization is a globally pervasive trend. Although urban settings provide better access to infrastructure and opportunities, urban lifestyles have certain negative consequences on human health. A number of recent studies have found interesting associations between the structure of human gut microbiota and the prevalence of metabolic conditions characterizing urban populations. The present study attempts to expand the footprint of these investigations to an Indian context. The objectives include elucidating specific patterns and gradients based on resident habitat and lifestyles (i.e., tribal and urban) that characterize gut microbial communities. Methods: Available 16S rRNA …

Peer ethnicity and achievement: a meta-analysis into the compositional effect

2010

This study reports a meta-analysis on the effects of ethnic minority share in school on achievement test scores. Best evidence from the studies that have appeared thus far on this topic shows that these compositional effects appear small in general, but may be larger when the ethnic minority group is African Americans in the USA, than when the minority group consists of immigrants. A high share of students from an ethnic minority group seems to affect the achievement from students belonging to the same ethnic group more, than the achievement of students belonging to the ethnic majority or to other ethnic minority groups. Effects of the share of immigrants on test scores of ethnic majority s…

Confine: unione vs separazione

2019

Parlare di confini e cittadinanza fa riflettere su quanto complesso possa essere dare una definizione univoca del termine confine e che prescinda dai diversi contesti culturali ed ambiti disciplinari. Il dibattito attorno a questo termine, che spesso viene collegato a quello di separazione, fa riflettere come un semplice concetto di linea, anche immaginaria, può innescare valutazioni e approfondimenti sul termine stesso come su altri che spesso vengono utilizzati come sinonimi o messi in relazione con esso. Confine, quindi, un termine complesso, articolato, discusso, controverso a volte pericoloso. Ma è proprio discutendone, al di fuori di stretti confini disciplinari, che si potrà recup…

Primi dati sull’uso dell’habitat in una popolazione siciliana di Natrix natrix.

2013

First data about the habitat use in a population of Natrix natrix from Sicily. In the present paper the preliminary results of an investigation carried out on a Sicilian population of the grass snake (Natrix natrix) are reported. The leading aim of this study is to compare habitat use among three different classes of individuals (males, females, immatures), using as input the density of observations in four habitat types. Field studies were conducted beside a reservoir (“Lago di Scanzano”), located about 40 km from Palermo (western Sicily). Our results indicate spatial and temporal differences among groups. Young individuals were observed more frequently between April and May along wet mead…

The grass is always greener on the other side of the fence: the effect of misperceived signalling in a network formation process

2007

Social and economic networks are becoming increasingly popular in the last ten years, because of both the application of game theory to the network formation processes4, and the study of stochastic processes that fit the statistical properties of real world social networks.5 In the very recent years there have also been attempts to combine the contribution of these two streams of research, trying to find strategic models whose equilibria resemble the empirical data.6 A well known source of debate in the game theoretical approach is the incompatibility between stability and efficiency: in most of the models Nash equilibria are actually not the network architectures that maximize the overall …

Procesos recientes de segregación e incorporación de municipios en Andalucía. ¿La fusión o la cooperación como solución al minifundismo local?

2020

El mapa municipal andaluz está compuesto en la actualidad por 785 municipios, aunque esta realidad política, administrativa y territorial ha experimentado un auge importante de los fenómenos segregacionistas durante el período constitucional, siendo especialmente numerosos durante la última década, con la creación de 14 municipios, con base jurídica mayoritaria en la Ley de Autonomía Local deAndalucía (2010). Con la Ley, estatal, de Racionalización y Sostenibilidad de la Administración Local (2013), se han endurecido las condiciones para la segregación, estableciéndose el umbral poblacional mínimo de 5.000 habitantes y su viabilidad financiera. El objetivo de esta investigación es profundiz…