Copy number of P elements, KP/full-sized P element ratio and their relationships with environmental factors in Brazilian Drosophila melanogaster populations

The P transposable element copy numbers and the KP/full-sized P element ratios were determined in eight Brazilian strains of Drosophila melanogaster. Strains from tropical regions showed lower overall P element copy numbers than did strains from temperate regions. Variable numbers of full-sized and defective elements were detected, but the full-sized P and KP elements were the predominant classes of elements in all strains. The full-sized P and KP element ratios were calculated and compared with latitude. The northernmost and southernmost Brazilian strains showed fewer full-sized elements than KP elements per genome, and the strains from less extreme latitudes had many more full-sized P than KP elements. However, no clinal variation was observed. Strains from different localities, previously classified as having P cytotype, displayed a higher or a lower proportion of KP elements than of full-sized P elements, as well as an equal number of the two element types, showing that the same phenotype may be produced by different underlying genomic components of the P-M system.

Losing identity: structural diversity of transposable elements belonging to different classes in the genome of Anopheles gambiae

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Reflexão e identidade profissional do professor de LE: que histórias contam os futuros professores?

Este artigo relata os resultados de um estudo realizado com alunas de graduação em Letras, Português - Língua Estrangeira (Inglês, Espanhol, Italiano, Japonês, Francês e Alemão). Objetivou verificar as metáforas, regras da prática e princípios que as alunas identificaram durante um processo de reflexão sobre suas formações profissionais. Foi possível identificar o impacto desses elementos em seus processos individuais de desenvolvimento de identidades como professoras. O resultado foi um conjunto de histórias biográficas escritas (fontes de experiências) nas quais as participantes se baseavam para constituir suas identidades profissionais como professoras de línguas estrangeiras. Nesses processos, elas puderam construir ligações significativas entre os aspectos teóricos evidenciados nas leituras que realizaram durante o período da pesquisa e os vários eventos marcantes de suas narrativas orais acerca da carreira profissional. A associação dos vários aspectos de suas histórias pessoais às questões teóricas que foram discutidas durante a pesquisa revela processos de construções de identidades profissionais como professoras de línguas estrangeiras.

Foreign Direct Investment in Latin America and the Caribbean 2007

Includes bibliography

Foreign Direct Investment in Latin America and the Caribbean 2008

Includes bibliography

Foreign Direct Investment in Latin America and the Caribbean 2010

Includes bibliography

Foreign Direct Investment in Latin America and the Caribbean 2011

Includes bibliography

Foreign Direct Investment in Latin America and the Caribbean 2012

Includes bibliography

International trade in Latina America and the Caribbean 2009: crisis and recovery

Includes bibliography

Maritime transport liberalization and the challenges to further its implementation in Chile

Includes bibliography

Evolutionary dynamics of retrotransposable elements Rex1, Rex3 and Rex6 in neotropical cichlid genomes

Background: Transposable elements (TEs) have the potential to produce broad changes in the genomes of their hosts, acting as a type of evolutionary toolbox and generating a collection of new regulatory and coding sequences. Several TE classes have been studied in Neotropical cichlids; however, the information gained from these studies is restricted to the physical chromosome mapping, whereas the genetic diversity of the TEs remains unknown. Therefore, the genomic organization of the non-LTR retrotransposons Rex1, Rex3, and Rex6 in five Amazonian cichlid species was evaluated using physical chromosome mapping and DNA sequencing to provide information about the role of TEs in the evolution of cichlid genomes. Results: Physical mapping revealed abundant TE clusters dispersed throughout the chromosomes. Furthermore, several species showed conspicuous clusters accumulation in the centromeric and terminal portions of the chromosomes. These TE chromosomal sites are associated with both heterochromatic and euchromatic regions. A higher number of Rex1 clusters were observed among the derived species. The Rex1 and Rex3 nucleotide sequences were more conserved in the basal species than in the derived species; however, this pattern was not observed in Rex6. In addition, it was possible to observe conserved blocks corresponding to the reverse transcriptase fragment of the Rex1 and Rex3 clones and to the endonuclease of Rex6. Conclusion: Our data showed no congruence between the Bayesian trees generated for Rex1, Rex3 and Rex6 of cichlid species and phylogenetic hypothesis described for the group. Rex1 and Rex3 nucleotide sequences were more conserved in the basal species whereas Rex6 exhibited high substitution rates in both basal and derived species. The distribution of Rex elements in cichlid genomes suggests that such elements are under the action of evolutionary mechanisms that lead to their accumulation in particular chromosome regions, mostly in heterochromatins. © 2013 Schneider et al.; licensee BioMed Central Ltd.

Investigando o processo ensino-aprendizagem de LE in-tandem: aprendizagem da língua francesa em contexto digital

Pós-graduação em Estudos Linguísticos - IBILCE

Foreign Direct Investment in Latin America and the Caribbean 2013

Includes bibliography.

Foreign Direct Investment in Latin America and the Caribbean 2009

Includes bibliography.

Foreign Direct Investment in Latin America and the Caribbean 2015

In previous editions of Foreign Direct Investment in Latin America and the Caribbean, the year given on the cover and in the title was the year for which data were presented. Starting with this edition, however, the title carries the year in which the report is published, consistently with the practice for the other flagship reports published by ECLAC. As a result, there is no 2014 edition of Foreign Direct Investment.