Insertion of heterometals into the NifEN-associated iron–molybdenum cofactor precursor

The cofactors of Mo-, V-, Fe-dependent nitrogenases are believed to be highly homologous in structure despite the different types of heterometals (Mo, V, and Fe) they contain. Previously, a precursor form of the FeMo cofactor (FeMoco) was captured on NifEN, a scaffold protein for FeMoco biosynthesis. This all-Fe precursor closely resembles the Fe/S core structure of the FeMoco and, therefore, could reasonably serve as a precursor for all nitrogenase cofactors. Here, we report the heterologous incorporation of V and Fe into the NifEN-associated FeMoco precursor. EPR and activity analyses indicate that V and Fe can be inserted at much reduced efficiencies compared with Mo, and incorporation of both V and Fe is enhanced in the presence of homocitrate. Further, native polyacrylamide gel electrophoresis experiments suggest that NifEN undergoes a significant conformational rearrangement upon metal insertion, which allows the subsequent NifEN–MoFe protein interactions and the transfer of the cofactor between the two proteins. The combined outcome of these in vitro studies leads to the proposal of a selective mechanism that is utilized in vivo to maintain the specificity of heterometals in nitrogenase cofactors, which is likely accomplished through the redox regulation of metal mobilization by different Fe proteins (encoded by nifH, vnfH, and anfH, respectively), as well as the differential interactions between these Fe proteins and their respective scaffold proteins (NifEN and VnfEN) in the Mo-, V-, and Fe-dependent nitrogenase systems

Health services users with diabetes mellitus: from knowledge to the use of healthcare rights

This descriptive study with qualitative approach analyzes the knowledge of individuals with diabetes mellitus (DM) concerning their health rights. Open interviews were conducted with 12 individuals with DM in a university center in the interior of Sao Paulo, Brazil. Content analysis enabled the identification of two categories: the users’ (lack of) knowledge concerning their rights and the unaware exercise of their rights. The results revealed that despite the legal advancements achieved in public policies, most users with DM are unaware of their rights, although they use the benefits that accrue from law in an unconscious way. Providing complete and sufficient information is essential so that individuals are able to make the best decision in relation to their treatment, preserving their autonomy.Se trata de un estudio descriptivo de abordaje cualitativo, con el objetivo de analizar el conocimiento de los usuarios de los servicios de salud con diabetes mellitus (DM) acerca de sus derechos. Participaron 12 personas con DM atendidas en un centro universitario del interior paulista en 2008, por medio de entrevista abierta. El análisis de contenido temático de los datos posibilitó identificar dos categorías: el (des)conocimiento de los usuarios de los servicios de salud con diabetes sobre sus derechos y el ejercicio no consciente de sus derechos por las personas con DM. Fue posible constatar que, a pesar de los avances legalmente alcanzados por las políticas públicas, la mayoría de los usuarios de los servicios de salud con DM desconoce sus derechos, a pesar de que utilizan los beneficios provenientes de la legislación, de manera no consciente. Se resalta como punto fundamental proveer informaciones completas y suficientes para que la persona pueda tomar la mejor decisión en relación a su tratamiento, preservando su autonomía en los servicios de salud.Estudo descritivo de abordagem qualitativa, e teve como objetivo analisar o conhecimento dos usuários dos serviços de saúde com diabetes mellitus (DM), acerca dos seus direitos. Participaram 12 pessoas com DM, atendidas em um centro universitário do interior paulista, em 2008, por meio de entrevista aberta. A análise de conteúdo temática dos dados possibilitou identificar duas categorias: o (des)conhecimento dos usuários dos serviços de saúde com diabetes sobre seus direitos e o exercício não consciente dos seus direitos pelas pessoas com DM. Foi possível constatar que, apesar dos avanços legalmente alcançados pelas políticas públicas, a maioria dos usuários dos serviços de saúde com DM desconhece seus direitos, embora utilize, de maneira não consciente, os benefícios advindos da legislação. Ressalta-se como ponto fundamental prover informações completas, suficientes para que a pessoa possa tomar a melhor decisão em relação ao seu tratamento, preservando sua autonomia, nos serviços de saúde

Cultural adaptation and validation of an instrument on barriers for the use of research results

ABSTRACT Objective: to culturally adapt The Barriers to Research Utilization Scale and to analyze the metric validity and reliability properties of its Brazilian Portuguese version. Method: methodological research conducted by means of the cultural adaptation process (translation and back-translation), face and content validity, construct validity (dimensionality and known groups) and reliability analysis (internal consistency and test-retest). The sample consisted of 335 nurses, of whom 43 participated in the retest phase. Results: the validity of the adapted version of the instrument was confirmed. The scale investigates the barriers for the use of the research results in clinical practice. Confirmatory factorial analysis demonstrated that the Brazilian Portuguese version of the instrument is adequately adjusted to the dimensional structure the scale authors originally proposed. Statistically significant differences were observed among the nurses holding a Master's or Doctoral degree, with characteristics favorable to Evidence-Based Practice, and working at an institution with an organizational cultural that targets this approach. The reliability showed a strong correlation (r ranging between 0.77 and 0.84, p<0.001) and the internal consistency was adequate (Cronbach's alpha ranging between 0.77 and 0.82). Conclusion: the Brazilian Portuguese version of The Barriers Scale was valid and reliable in the group studied

Model-Derived Dispersal Pathways from Multiple Source Populations Explain Variability of Invertebrate Larval Supply

Background: Predicting the spatial and temporal patterns of marine larval dispersal and supply is a challenging task due to the small size of the larvae and the variability of oceanographic processes. Addressing this problem requires the use of novel approaches capable of capturing the inherent variability in the mechanisms involved. Methodology/Principal Findings: In this study we test whether dispersal and connectivity patterns generated from a biophysical model of larval dispersal of the crab Carcinus maenas, along the west coast of the Iberian Peninsula, can predict the highly variable daily pattern of wind-driven larval supply to an estuary observed during the peak reproductive season (March–June) in 2006 and 2007. Cross-correlations between observed and predicted supply were significant (p,0.05) and strong, ranging from 0.34 to 0.81 at time lags of 26 to+5 d. Importantly, the model correctly predicted observed cross-shelf distributions (Pearson r = 0.82, p,0.001, and r = 0.79, p,0.01, in 2006 and 2007) and indicated that all supply events were comprised of larvae that had been retained within the inner shelf; larvae transported to the outer shelf and beyond never recruited. Estimated average dispersal distances ranged from 57 to 198 km and were only marginally affected by mortality. Conclusions/Significance: The high degree of predicted demographic connectivity over relatively large geographic scales is consistent with the lack of genetic structuring in C. maenas along the Iberian Peninsula. These findings indicate that the dynamic nature of larval dispersal can be captured by mechanistic biophysical models, which can be used to provid