Endophytic Methylobacterium extorquens expresses a heterologous beta-1,4-endoglucanase A (EglA) in Catharanthus roseus seedlings, a model host plant for Xylella fastidiosa

Based on the premise of symbiotic control, we genetically modified the citrus endophytic bacterium Methylobacterium extorquens, strain AR1.6/2, and evaluated its capacity to colonize a model plant and its interaction with Xylella fastidiosa, the causative agent of Citrus Variegated Chlorosis (CVC). AR1.6/2 was genetically transformed to express heterologous GFP (Green Fluorescent Protein) and an endoglucanase A (EglA), generating the strains ARGFP and AREglA, respectively. By fluorescence microscopy, it was shown that ARGFP was able to colonize xylem vessels of the Catharanthus roseus seedlings. Using scanning electron microscopy, it was observed that AREglA and X. fastidiosa may co-inhabit the C. roseus vessels. M. extorquens was observed in the xylem with the phytopathogen X. fastidiosa, and appeared to cause a decrease in biofilm formation. AREglA stimulated the production of resistance protein, catalase, in the inoculated plants. This paper reports the successful transformation of AR1.6/2 to generate two different strains with a different gene each, and also indicates that AREglA and X. fastidiosa could interact inside the host plant, suggesting a possible strategy for the symbiotic control of CVC disease. Our results provide an enhanced understanding of the M. extorquens-X. fastidiosa interaction, suggesting the application of AR1.6/2 as an agent of symbiotic control.

Expressões utilizadas por familiares ao relatarem experiências de conviver com o adoecimento mental

OBJETIVO: Identificar as expressões usadas por familiares para descrever a experiência de conviver com o adoecimento mental. MÉTODOS: Tratase de pesquisa que realizou análise dos relatos de familiares por meio do software Analyse Lexicale par Contexte d'um Ensemble de Segments de Texte (ALCESTE), contendo metodologia de análise de dados qualitativos que se adapta a qualquer domínio de investigação, em que se pretenda tratar material textual. RESULTADOS: A análise realizada pelo ALCESTE forneceu quatro classes agrupadas duas a duas: Classe 2 -- início da doença e Classe 4 -- início do tratamento; Classe 1 -- convivência e Classe 3 - cotidiano. CONCLUSÃO: Os momentos descritos pelos familiares foram identificados por expressões, palavras e termos usados pelos mesmos em suas narrações. A principal contribuição deste estudo foi trazer a linguagem dos familiares para descrever os momentos do adoecimento por meio de uma metodologia de análise mais distante do pesquisador.