RESUMO
Magnetotactic bacteria (MTB) response to the magnetic field can be classified into north-seeking (NS) and south-seeking (SS), which usually depends on their inhabiting site in the North and South Hemisphere, respectively. However, uncommon inverted polarity was observed on both hemispheres. Here, we studied magnetotactic multicellular prokaryotes (MMPs) from a coastal lagoon in Brazil collected in April and August 2014. MMPs from the first sampling period presented both magnetotactic behaviors, while MMPs collected in August/2014 were only SS. Phylogenetic analysis based on the 16S rRNA coding gene showed that these organisms belong to the Deltaproteobacteria class. The 16S rRNA gene sequences varied among MMPs regardless of the sampling period, and similarity values were not related to the type of magnetotactic response presented by the microorganisms. Therefore, differences in the magnetotactic behavior might result from the physiological state of MMPs, the availability of resources, or the instability of the chemical gradient in the environment. This is the first report of NS magnetotactic behavior on MMPs from the South Hemisphere.
Assuntos
Deltaproteobacteria , Brasil , Deltaproteobacteria/genética , Metaloproteinases da Matriz/genética , Filogenia , RNA Ribossômico 16S/genéticaRESUMO
Uma das alternativas para manter o idoso ativo a fim de melhorar as capacidades funcionais e a qualidade de vida (QV) é o treinamento de força (TF). Porém, existem variáveis que devem ser consideradas na prescrição do TF como a velocidade de movimento. O objetivo do presente estudo foi realizar uma revisão sistemática para verificar o impacto de programas de TF realizados com diferentes velocidades de movimento na capacidade funcional e qualidade de vida em idosos saudáveis. Após seleção de artigos nas bases de dados Pubmed, Scopus e Web of Science foram encontrados 282 artigos, contudo, após a aplicação dos critérios de inclusão e exclusão foram considerados elegíveis 13 artigos para a revisão. Desses, 10 evidenciaram melhora na funcionalidade do grupo treinamento de força em alta velocidade (TFAV) ou resultado similar comparado ao treinamento tradicional (TT), dois encontraram resultados inalterados para ambos os grupos e um indicou que o grupo TT teve melhoras nos testes funcionais comparado ao TFAV. Quanto à QV, somente dois artigos avaliaram esta variável e foi observado resultado positivo utilizando o TFAV. Assim, foi observado que grande parte dos estudos sugere a realização do TFAV em detrimento do TT visando melhora ou manutenção da funcionalidade e QV. (AU)
One of the alternatives to keep the elderly active in order to improve functional capacities and quality of life (QL) is resistance training (RT). However, there are variables that should be considered in the prescription of RT as the speed of movement. The aim of the present study was to carry out a systematic review to verify the impact of RT programs carried out with different movement speeds on functional capacity and quality of life in healthy elderly people. After selecting articles in the Pubmed, Scopus and Web of Science databases, 282 articles were found, however, after applying the inclusion and exclusion criteria, 13 articles were considered eligible for review. Of these, 10 showed improvement in the functionality of the high-speed resistance training group (HSRT) or similar result compared to traditional training (TT), two found results unchanged for both groups and one indicated that the TT group had improvements in functional tests compared to HSRT. As for QL, only two articles evaluated this variable and a positive result was observed using HSRT. Thus, it was observed that most studies suggest the performance of HSRT at the expense of TT in order to improve or maintain functionality and QL. (AU)