Search results for "Segregation"

Convergent Evolution in Intracellular Elements: Plasmids as Model Endosymbionts

2018

Endosymbionts are organisms that live inside the cells of other species. This lifestyle is ubiquitous across the tree of life and is featured by unicellular eukaryotes, prokaryotes, and by extrachromosomal genetic elements such as plasmids. Given that all of these elements dwell in the cytoplasm of their host cell, they should be subject to similar selection pressures. Here we show that strikingly similar features have evolved in both bacterial endosymbionts and plasmids. Since host and endosymbiont are often metabolically tightly intertwined, they are difficult to disentangle experimentally. We propose that using plasmids as tractable model systems can help to solve this problem, thus allo…

Una segregazione paradossale e multi-scalare: il caso del quartiere ZEN di Palermo

2016

L’articolo affronta la questione della segregazione nel quartiere ZEN di Palermo (Sicilia). L’impianto teorico dialoga con la letteratura anglosassone, ma ne prende le distanze nel tentativo di individuare alcune specificità locali del caso. L’obiettivo è duplice: intanto indentificare alcuni “movimenti geostorici” che hanno caratterizzato il quartiere, collegando a ciascuno di questi una fase del processo segregativo; inoltre, rappresentare la segregazione del quartiere in forma cartografica, mediante l’uso di alcuni ideogrammi e mappe mentali. This article deals with the issue of segregation in the ZEN district of Palermo, Sicily. The theoretical framework is built around Anglo-Saxon refe…

Synergy of spatial frequency and orientation bandwidth in texture segregation

2021

Defining target textures by increased bandwidths in spatial frequency and orientation, we observed strong cue combination effects in a combined texture figure detection and discrimination task. Performance for double-cue targets was better than predicted by independent processing of either cue and even better than predicted from linear cue integration. Application of a texture-processing model revealed that the oversummative cue combination effect is captured by calculating a low-level summary statistic (\(\Delta CE_m\)), which describes the differential contrast energy to target and reference textures, from multiple scales and orientations, and integrating this statistic across channels wi…

Rasisms un noziegumi Voltera Moslija detektīvromānos "Velns zilā kleitā", "Sarkanā nāve" un "Balts tauriņš"

2019

Bakalauradarbs „Rasisms un kriminālsVolteraMoslijadetektīvromānos „Velnszilākleitā”, „Sarkanānāve” un „Baltstauriņš”” analizēnosauktus romānus ar uzsvaru uz aprakstītas kriminālas situācijas un rasismu ASV kopumā un Kalifornijā. Ņemot vērā ka romāni pieder pie daiļliteratūras un autora situācijas redzējums var atšķirties no reālas situācijas ASV četrdesmitajos un piecdesmitajos gados, ir savākta un apkopota informācija par rasisma un segregācijas vēsturi ASV, lai izprastu, cik patiess priekšstats par situāciju autors dod. Bakalaura darba mērķis ir atrast rasisma un segregācijas piemērus romānos; saprast, kā atrastie piemēri ilustrē rasisma, augstu ieslodzīto un apsūdzēto afroamerikāņu īpats…

El proyecto mapa escolar de Valencia: Análisis de la zonificación educativa de la ciudad de Valencia

2018

The research project Mapa Escolar de Valencia (School Map of Valencia) was born out of an agreement between the City Council and the University of Valencia in order to carry out an investigation of the compulsory education system of the city and propose, if necessary, modifications to the current school zoning. The project is structured in several research areas. An analysis of the specialized scientific literature and public policies concerning education and schooling has been done, and it is currently analysing the evolution of quantitative and qualitative data on compulsory schooling in Valencia, its school zoning, the representations of education and the school climate in the city schoo…

RB acute loss induces centrosome amplification and aneuploidy in murine primary fibroblasts

2006

AbstractBackgroundIncorrect segregation of whole chromosomes or parts of chromosome leads to aneuploidy commonly observed in cancer. The correct centrosome duplication, assuring assembly of a bipolar mitotic spindle, is essential for chromosome segregation fidelity and preventing aneuploidy. Alteration of p53 and pRb functions by expression of HPV16-E6 and E7 oncoproteins has been associated with centrosome amplification. However, these last findings could be the result of targeting cellular proteins in addition to pRb by HPV16-E7 oncoprotein. To get a more detailed picture on the role of pRb in chromosomal instability and centrosome amplification, we analyzed the effects of the acute loss …

Wnt signaling recruits KIF2A to the spindle to ensure chromosome congression and alignment during mitosis

2021

Canonical Wnt signaling plays critical roles in development and tissue renewal by regulating β-catenin target genes. Recent evidence showed that β-catenin–independent Wnt signaling is also required for faithful execution of mitosis. However, the targets and specific functions of mitotic Wnt signaling still remain uncharacterized. Using phosphoproteomics, we identified that Wnt signaling regulates the microtubule depolymerase KIF2A during mitosis. We found that Dishevelled recruits KIF2A via its N-terminal and motor domains, which is further promoted upon LRP6 signalosome formation during cell division. We show that Wnt signaling modulates KIF2A interaction with PLK1, which is critical for K…

Cartes et élections : la construction des circonscriptions électorales aux Etats-Unis, entre égalité et équité

2003

Maps and Elections : The Construction of Electoral Districts in the USA. Decennal census-led redistricting in the United States is the occasion for court actions focused nowadays on the political representation of ethnic minorities. Computer tools make possible the building of districts specifically tailored for Blacks or Hispanics, but blatant racial gerrymandering is now rejected by the US Supreme Court. This paper examines the most relevant judicial decisions and describes several local cases.

Citrate-nitrate auto-combustion synthesis of perovskite-type nanopowders: A systematic approach

2009

Rethinking Civil Society in Development: Scales and Situated Hegemonies

2016

Ethnic residential segregation is often explained with the claim that ‘immigrants don’t want to integrate—they prefer to stick together with co-ethnics’. By contrast, mixed neighbourhoods are seen as crucial for achieving social cohesion. In line with spatial assimilation theory there is a normative assumption that people interact with those living nearby. From interviews on neighbourhood qualities and locations valued by Oslo residents of Turkish, Somali and Polish backgrounds, we raise questions about the validity of two assumptions: that most immigrants want to live in the same neighbourhoods as co-ethnics; and that they want to live close to co-ethnics because they do not want to integr…