Search results for "Population"
showing 10 items of 9945 documents
Recurrent domestication by Lepidoptera of genes from their parasites mediated by Bracoviruses
2015
Bracoviruses are symbiotic viruses associated with tens of thousands of species of parasitic wasps that develop within the body of lepidopteran hosts and that collectively parasitize caterpillars of virtually every lepidopteran species. Viral particles are produced in the wasp ovaries and injected into host larvae with the wasp eggs. Once in the host body, the viral DNA circles enclosed in the particles integrate into lepidopteran host cell DNA. Here we show that bracovirus DNA sequences have been inserted repeatedly into lepidopteran genomes, indicating this viral DNA can also enter germline cells. The original mode of Horizontal Gene Transfer (HGT) unveiled here is based on the integrativ…
Les ménestrels du duc. Musique et politique à la cour de Philippe le Hardi (1364-1404)
1999
Place: Dijon
Migrācijas ietekme uz darba tirgu Latvijā
2017
Bakalaura darba tēma ir "Migrācijas ietekme uz darba tirgu Latvijā" Pētījuma izstrādes mērķis ir identificēt nozīmīgākos iemeslus un raksturot sekas migrācijai, un izstrādāt ieteikumus tās samazināšanai, kā arī izvērtēt kādas sekas migrācija atstāj uz uzņēmējdarbību. Pēc Latvijas iestāšanās Eiropas Savienībā, pieauga Latvijas iedzīvotāju emigrācija uz citām valstīm, līdz ar to Latvija saskaras ar „smadzeņu aizplūdi” un darbaroku trūkumu, dažkārt pārpalikumu. Pētījuma ietvaros ir veikta zinātnisko materiālu, informācijas dažādās publikācijās, aptaujas un interviju izpēte un tās iegūtās informācijas apstrāde un analīze. Empīriski pētnieciska daļa sastāv no Latvijas iedzīvotāju un aizbraukušo …
Density Decline in a Mediterranean Seahorse Population: Natural Fluctuations or New Emerging Threats?
2021
Illegal wildlife trade is considered one of the most serious threats to biodiversity worldwide, along with habitat loss/degradation and overfishing of wild stocks. Seahorses are considered at high risk as these fish represent an important component of traditional Chinese medicine but are also sold as curios and ornamental fish. On a worldwide level, illegal trade is controlled by numerous laws and regulations, but it seems to continue by assuming more dynamic routes. In the Mediterranean Sea, Hippocampus guttulatus formed one of the largest populations at Mar Piccolo di Taranto in South-Eastern Italy. During the routine monitoring of this population in 2016, a dramatic density decrease was …
Cell biology: Refined siRNA screens.
2012
A large set of high-content RNAi screens investigating mammalian virus infection and multiple cellular activities is analysed to reveal the impact of population context on phenotypic variability and to identify indirect RNAi effects.
The role of maternal effects in host-parasite interactions: examination of the development of the immune defense in a colonial seabird, the black-leg…
2004
One of the main aims of evolutionary biology is to understand the mechanisms responsible for the phenotypic variation on which natural selection can act. Maternal effects occur when a mother's phenotype or her environment influence her offspring's phenotype. Despite the importance of such effects for the ecology of host-parasite interactions, their role has been relatively neglected to date. In this thesis, we examined how mothers influence the immune defense of their young in an environment that varies in space and time. This work has primarily focused on a colonial seabird, the black-legged kittiwake (Rissa tridactyla). Using this model, we have first shown that specific maternal antibodi…