Soil and Cultivar Type Shape the Bacterial Community in the Potato Rhizosphere

The rhizospheres of five different potato cultivars (including a genetically modified cultivar) obtained from a loamy sand soil and two from a sandy peat soil, next to corresponding bulk soils, were studied with respect to their community structures and potential function. For the former analyses, we performed bacterial 16S ribosomal RNA gene-based PCR denaturing gradient gel electrophoresis (PCR-DGGE) on the basis of soil DNA; for the latter, we extracted microbial communities and subjected these to analyses in phenotype arrays (PM1, PM2, and PM4, Biolog), with a focus on the use of different carbon, sulfur and phosphorus sources. In addition, we performed bacterial PCR-DGGE on selected wells to assess the structures of these substrate-responsive communities. Effects of soil type, the rhizosphere, and cultivar on the microbial community structures were clearly observed. Soil type was the most determinative parameter shaping the functional communities, whereas the rhizosphere and cultivar type also exerted an influence. However, no genetically modified plant effect was observed. The effects were imminent based on general community analysis and also single-compound analysis. Utilization of some of the carbon and sulfur sources was specific per cultivar, and different microbial communities were found as defined by cultivar. Thus, both soil and cultivar type shaped the potato root-associated bacterial communities that were responsive to some of the substrates in phenotype arrays

Diversity of Bacteria Associated with Bursaphelenchus xylophilus and Other Nematodes Isolated from Pinus pinaster Trees with Pine Wilt Disease

The pinewood nematode (PWN), Bursaphelenchus xylophilus, has been thought to be the only causal agent of pine wilt disease (PWD), however, since bacteria have been suggested to play a role in PWD, it is important to know the diversity of the microbial community associated to it. This study aimed to assess the microbial community associated with B. xylophilus and with other nematodes isolated from pine trees, Pinus pinaster, with PWD from three different affected forest areas in Portugal. One hundred and twenty three bacteria strains were isolated from PWN and other nematodes collected from 14 P. pinaster. The bacteria strains were identified by comparative analysis of the 16S rRNA gene partial sequence. All except one Gram-positive strain (Actinobacteria) belonged to the Gram-negative Beta and Gammaproteobacteria. Most isolates belonged to the genus Pseudomonas, Burkholderia and to the family Enterobacteriaceae. Species isolated in higher percentage were Pseudomonas lutea, Yersinia intermedia and Burkholderia tuberum. The major bacterial population associated to the nematodes differed according to the forest area and none of the isolated bacterial species was found in all different forest areas. For each of the sampled areas, 60 to 100% of the isolates produced siderophores and at least 40% produced lipases. The ability to produce siderophores and lipases by most isolates enables these bacteria to have a role in plant physiological response. This research showed a high diversity of the microbial community associated with B. xylophilus and other nematodes isolated from P. pinaster with PWD

Repercussões fonoaudiológicas na Síndrome de Seckel: estudo de caso

Resumo: Síndrome de Seckel, trata-se de condição rara e de herança autossômica recessiva, hereditário, caracterizada por um severo retardo de crescimento intra-uterino, baixa estatura proporcional, microcefalia com queixo retraído e pequeno, nariz grande e curvo, em alguns casos retardo mental, várias anomalias congênitas em face, crânio e esqueleto, entre outras malformações. O objetivo deste estudo foi identificar as manifestações fonoaudiológicas encontradas nesta Síndrome, a partir do relato de um caso clínico, de um paciente do gênero masculino, de 09 anos de idade, encaminhado pela odontopediatria, com queixa de alteração no padrão respiratório. Foi realizada avaliação fonoaudiológica que abordou: descrição física, aspectos das funções estomatognáticas, da linguagem oral e escrita, da voz e audição e dos aspectos cognitivos. Para complementação do diagnóstico fonoaudiológico, foram realizadas avaliações ortodôntica, otorrinolaringológica e fisioterapêutica. Com relação às funções estomatognáticas, a criança apresentou respiração de modo oral, mastigação com preensão dos alimentos nos dentes laterais, mastigação unilateral, com lábios entreabertos e movimentos exagerados da musculatura perioral; deglutição com interposição de língua e participação da musculatura orofacial. Fala com articulação imprecisa e travada, devido à limitação de abertura de boca. No tocante à voz, o paciente apresentou tempo máximo de fonação reduzido, laringe em posição elevada, ressonância nasal, ataques vocais suaves e intensidade fraca. Não fora observada nenhuma alteração na linguagem oral e escrita. A escassez de estudos relatando manifestações fonoaudiológicas na Síndrome de Seckel, associada à raridade de ocorrência, justifica o interesse em realizar este estudo, para colaboração de maior conhecimento por parte dos fonoaudiólogos e profissionais de saúde

µ-Calpain Conversion of Antiapoptotic Bfl-1 (BCL2A1) into a Prodeath Factor Reveals Two Distinct alpha-Helices Inducing Mitochondria-Mediated Apoptosis

Anti-apoptotic Bfl-1 and pro-apoptotic Bax, two members of the Bcl-2 family sharing a similar structural fold, are classically viewed as antagonist regulators of apoptosis. However, both proteins were reported to be death inducers following cleavage by the cysteine protease µ-calpain. Here we demonstrate that calpain-mediated cleavage of full-length Bfl-1 induces the release of C-terminal membrane active α-helices that are responsible for its conversion into a pro-apoptotic factor. A careful comparison of the different membrane-active regions present in the Bfl-1 truncated fragments with homologous domains of Bax show that helix α5, but not α6, of Bfl-1 induces cell death and cytochrome c release from purified mitochondria through a Bax/Bak-dependent mechanism. In contrast, both helices α5 and α6 of Bax permeabilize mitochondria regardless of the presence of Bax or Bak. Moreover, we provide evidence that the α9 helix of Bfl-1 promotes cytochrome c release and apoptosis through a unique membrane-destabilizing action whereas Bax-α9 does not display such activities. Hence, despite a common 3D-structure, C-terminal toxic domains present on Bfl-1 and Bax function in a dissimilar manner to permeabilize mitochondria and induce apoptosis. These findings provide insights for designing therapeutic approaches that could exploit the cleavage of endogenous Bcl-2 family proteins or the use of Bfl-1/Bax-derived peptides to promote tumor cell clearance

Contribuições da consciência fonológica e nomeação seriada rápida para a aprendizagem inicial da escrita

RESUMO Objetivo: investigar a contribuição da consciência fonológica e nomeação seriada rápida para a aprendizagem inicial da escrita. Métodos: participaram do estudo 100 crianças, na faixa etária de três a seis anos e onze meses, matriculadas na educação infantil de uma creche e uma escola municipal da cidade do Recife. Utilizou-se como instrumentos de avaliação o Teste de Consciência Fonológica, a tarefa de Nomeação Seriada Rápida e um roteiro de avaliação da escrita. Os dados foram transcritos e analisados conforme a estatística descritiva e inferencial. Resultados: observou-se que o aumento da faixa etária está diretamente relacionado ao desenvolvimento dos níveis de consciência fonológica, assim como com a diminuição dos erros e do tempo para execução das tarefas de NSR. Verificou-se que as crianças com mais de quatro anos, tiveram um desempenho em consciência fonológica aquém do esperado para sua idade. Dentre as habilidades de consciência fonológica, a consciência silábica obteve melhores índices de pontuações, podendo-se observar grande dificuldade dos participantes nas tarefas de consciência fonêmica. Com relação a escrita, a maioria das crianças estavam na fase pré-silábica. Foi possível verificar correlações significantes entre as habilidades de consciência fonológica com a nomeação seriada rápida e escrita. Conclusão: a consciência fonológica e nomeação seriada rápida contribuem para a aprendizagem inicial da escrita, sendo importante o estímulo destas habilidades antes do ciclo de alfabetização, o que pode favorecer este processo e sinalizar, precocemente, eventuais problemas de aprendizagem. O baixo desempenho nas tarefas pode ser sugestivo da influência de fatores socioeducacionais, devendo-se considerar o contexto de vida da criança e as experiências educativas vivenciadas na família e escola

Metabolomic profiles of hepatocellular carcinoma in a European prospective cohort

Background: Hepatocellular carcinoma (HCC), the most prevalent form of liver cancer, is difficult to diagnose and has limited treatment options with a low survival rate. Aside from a few key risk factors, such as hepatitis, high alcohol consumption, smoking, obesity, and diabetes, there is incomplete etiologic understanding of the disease and little progress in identification of early risk biomarkers. Methods: To address these aspects, an untargeted nuclear magnetic resonance metabolomic approach was applied to pre-diagnostic serum samples obtained from first incident, primary HCC cases (n = 114) and matched controls (n = 222) identified from amongst the participants of a large European prospective cohort. Results: A metabolic pattern associated with HCC risk comprised of perturbations in fatty acid oxidation and amino acid, lipid, and carbohydrate metabolism was observed. Sixteen metabolites of either endogenous or exogenous origin were found to be significantly associated with HCC risk. The influence of hepatitis infection and potential liver damage was assessed, and further analyses were made to distinguish patterns of early or later diagnosis. Conclusion: Our results show clear metabolic alterations from early stages of HCC development with application for better etiologic understanding, prevention, and early detection of this increasingly common cancer.This work was supported by the French National Cancer Institute (L’Institut National du Cancer; INCA; grant number 2009-139; PI: M. Jenab). AF received financial support (BDI fellowship) from the Centre National de la Recherche Scientifique (CNRS) and Bruker Biospin. The coordination of EPIC is financially supported by the European Commission (DG-SANCO) and the International Agency for Research on Cancer. The national cohorts are supported by Danish Cancer Society (Denmark); Ligue Contre le Cancer, Institut Gustave Roussy, Mutuelle Générale de l’Education Nationale, and Institut National de la Santé et de la Recherche Médicale (INSERM) (France); Deutsche Krebshilfe, Deutsches Krebsforschungszentrum (DKFZ), and Federal Ministry of Education and Research (Germany); Hellenic Health Foundation (Greece); Italian Association for Research on Cancer (AIRC), National Research Council, Associazione Italiana per la Ricerca sul Cancro-AIRC-Italy, and AIRE-ONLUS Ragusa, AVIS Ragusa, Sicilian Government (Italy); Dutch Ministry of Public Health, Welfare and Sports (VWS), Netherlands Cancer Registry (NKR), LK Research Funds, Dutch Prevention Funds, Dutch ZON (Zorg Onderzoek Nederland), World Cancer Research Fund (WCRF), and Statistics Netherlands (the Netherlands); European Research Council (ERC; grant number ERC-2009-AdG 232997) and Nordforsk, and Nordic Center of Excellence Programme on Food, Nutrition and Health (Norway); Health Research Fund (FIS), Regional Governments of Andalucía, Asturias, Basque Country, Murcia (No. 6236) and Navarra, and ISCIII RETIC (RD06/0020) (Spain); Swedish Cancer Society, Swedish Scientific Council, and Regional Government of Skåne and Västerbotten (Sweden); Cancer Research UK, Medical Research Council, Stroke Association, British Heart Foundation, Department of Health, Food Standards Agency, and Wellcome Trust (UK)