Search results for "Coloni"
showing 10 items of 1017 documents
Polymorphism in Developmental Mode and Its Effect on Population Genetic Structure of a Spionid Polychaete, Pygospio elegans
2012
Population genetic structure of sedentary marine species is expected to be shaped mainly by the dispersal ability of their larvae. Long-lived planktonic larvae can connect populations through migration and gene flow, whereas species with nondispersive benthic or direct-developing larvae are expected to have genetically differentiated populations. Poecilogonous species producing different larval types are ideal when studying the effect of developmental mode on population genetic structure and connectivity. In the spionid polychaete Pygospio elegans, different larval types have been observed between, and sometimes also within, populations. We used microsatellite markers to study population st…
Recolonization after habitat restoration leads to decreased genetic variation in populations of a terrestrial orchid.
2012
Colonization is crucial to habitat restoration projects that rely on the spontaneous regeneration of the original vegetation. However, as a previously declining plant species spreads again, the likelihood of founder effects increases through recurrent population founding and associated serial bottlenecks. We related Amplified Fragment Length Polymorphism markers genetic variation and fitness to colonization history for all extant populations of the outcrossing terrestrial orchid Dactylorhiza incarnata in an isolated coastal dune complex. Around 1970, D. incarnata suffered a severe bottleneck yet ultimately persisted and gradually spread throughout the spatially segregated dune slacks, aided…
Founder population size and number of source populations enhance colonization success in waterstriders.
2002
Understanding the factors that underlie colonization success is crucial both for ecological theory and conservation practices. The most effective way to assess colonization ability is to introduce experimentally different sets of individuals in empty patches of suitable habitat and to monitor the outcome. We translocated mated female waterstriders, Aquarius najas, into 90 streams that were not currently inhabited by the species. We manipulated sizes of propagules (from 2 to 16 mated females) and numbers of origin populations (one or two). Three origin populations were genetically different from each other, but they were less than 150 km from the streams of translocation. The results demonst…
TGF-β Suppresses Tumor Progression in Colon Cancer by Inhibition of IL-6 trans-Signaling
2004
Alterations of TGF-beta signaling have been described in colorectal cancer, although the molecular consequences are largely unknown. By using transgenic mice overexpressing TGF-beta or a dominant-negative TGF-betaRII, we demonstrate that TGF-beta signaling in tumor infiltrating T lymphocytes controls the growth of dysplastic epithelial cells in experimental colorectal cancer, as determined by histology and a novel system for high-resolution chromoendoscopy. At the molecular level, TGF-beta signaling in T cells regulated STAT-3 activation in tumor cells via IL-6. IL-6 signaling required tumor cell-derived soluble IL-6R rather than membrane bound IL-6R and suppression of such TGF-beta-depende…
Colonization of America by Drosophila subobscura: association between Odh gene haplotypes, lethal genes and chromosomal arrangements.
2004
The colonization of America by Drosophila subobscura has been a unique exper iment in nature that has allowed us to explore the effects of evolution on a continental scale. To analyze this evolutionary event, nucleotide sequences of the Odh (Octanol dehydrogenase) gene were obtained for 43 lethal chromosomal lines from colonizing populations of North America and 5 from South America, in addition to 5 chromosomal lines from Europe with different viabilities and 2 from laboratory marker stocks. Since 10 different Odh haplotypes were found in America, the minimum number of colonizers would be 5 (or 3 mated females). Only one Odh haplotype was found in American O(5) inversions confirming that o…
Simultaneous Aurora-A/STK15 overexpression and centrosome amplification induce chromosomal instability in tumour cells with a MIN phenotype
2007
Abstract Background Genetic instability is a hallmark of tumours and preneoplastic lesions. The predominant form of genome instability in human cancer is chromosome instability (CIN). CIN is characterized by chromosomal aberrations, gains or losses of whole chromosomes (aneuploidy), and it is often associated with centrosome amplification. Centrosomes control cell division by forming a bipolar mitotic spindle and play an essential role in the maintenance of chromosomal stability. However, whether centrosome amplification could directly cause aneuploidy is not fully established. Also, alterations in genes required for mitotic progression could be involved in CIN. A major candidate is represe…
Fonctions de la dystopie en contexte postcolonial
2023
Cette conférence visait à démontrer le caractère politique de la dystopie en s'appuyant sur la notion de "présentisme" (Hartog), de "littérature d'intervention" (Gefen) et sur l'idée qu'il y a une "repolitisation" de la littérature contemporaine (Besson, Gefen). Après une exploration du caractère éminemment réaliste du genre, quelques exemples ont été abordés: la trilogie "Maddaddam" de Margaret Atwood; quelques dystopies sud-africaines: "Moxyland" (L. Beukes), "Green Valley" (L. Greenberg) et le diptyque "North" et "South" de F. Owen.
Colonización territorial, razón ilustrada y particularidades valencianas en la nueva población de Benadressa (Castelló de la Plana)
2008
El presente artículo analiza la proyección de una nueva población en el interior de la Plana de Castelló (N. del País Valenciano), un proceso de colonización territorial realizado al amparo de la reposición del denominado Fuero o Privilegio Alfonsino (segunda mitad del s.XVIII). El ejemplo de Benadressa permite comprender las complejas relaciones de poder e ideología que se dieron en este tipo de planes, de iniciativa privada pero insertados plenamente en el proyecto económico y territorial de la Ilustración. A su vez, se trata de un capítulo más de las profundas transformaciones sufridas por la Plana de Castelló en la Edad Moderna, principalmente basadas en el avance de la superficie culti…
Le due Algeri di Pontecorvo: spazi sociali nella lotta all’indipendenza
2021
Nel breve saggio si riflette sul ruolo del cinema come mezzo capace di mostrare lo spazio come luogo di lotta politica. Attraverso l’ascolto e la narrazione degli “attori” locali, nell’elaborazione dei loro pensieri, si è costruito il film ma anche una metodologia della ricerca. Pontecorvo affronta il tema della violenza mostrandone tutti i lati oscuri, ne ricostruisce l’escalation senza dimenticare che il centro della storia è la resistenza anticoloniale. Su queste basi, il saggio, mostra come lo spazio di Algeri sia frammentato in due (colonizzatori e colonizzati) e come la lotta sfrutti le caratteristiche topologiche della città
The Spanish Creation of the Philippines: The Birth of a Nation
2017
This chapter examines the human background of the country from its early settlement to the end of the Spanish colonial era. Different theories have been presented to explain the initial settlement of the country. The Austronesian societies developed a social structure and patterns of commerce that were not completely erased by the Spanish colonization following the discovery travels of Magellan and others, and the conquest of the islands by Legazpi in the sixteenth century. Spanish control meant the imposition of the Catholic Church as a powerful element of organization in the countryside, and the development of cities following colonial Spanish guidelines. Manila was central to a large mar…