6 research outputs found
Trust and control interrelations: New perspectives on the trust control nexus
This article is the post-print version of the published article that may be accessed at the link below. Copyright @ 2007 Sage Publications.This article introduces the special issue on New Perspectives on the Trust-Control Nexus in Organizational Relations. Trust and control are interlinked processes commonly seen as key to reach effectiveness in inter- and intraorganizational relations. The relation between trust and control is, however, a complex one, and research into this relation has given rise to various and contradictory interpretations of how trust and control relate. A well-known discussion is directed at whether trust and control are better conceived as substitutes, or as complementary mechanisms of governance. The articles in this special issue bring the discussion on the relationship between both concepts a step further by identifying common factors, distinctive mechanisms, and key implications relevant for theory building and empirical research. By studying trust and control through different perspectives and at different levels of analysis, the articles provide new theoretical insights and empirical evidence on the foundations of the trust-control interrelations
Detection of siderophores in endophytic bacteria Methylobacterium spp. associated with Xylella fastidiosa subsp. pauca Detecção de siderĂłforos nas bactĂ©rias endofĂticas Methylobacterium spp. associadas com Xylella fastidiosa subsp. pauca
The objective of this work was to study the production of siderophores by endophytic bacteria Methylobacterium spp., which occupy the same ecological niche as Xylella fastidiosa subsp. pauca (Xfp) in citrus plants. The siderophore production of Methylobacterium strains was tested according to chromeazurol agar assay test (CAS), CsĂĄky test (hydroxamate-type) and Arnow test (catechol-type). In addition, the ability of Xfp to use siderophores, in vitro, produced by endophytic bacteria as source of iron, was evaluated. All 37 strains of Methylobacterium spp. tested were CAS-positive for siderophore production. Methylobacterium spp. produced hydroxamate-type, but not catechol-type siderophores. In vitro growth of Xfp was stimulated by the presence of supernatant siderophores of endophytic Methylobacterium mesophilicum.<br>O objetivo deste trabalho foi estudar a produção de siderĂłforos pelas bactĂ©rias endofĂticas Methylobacterium spp., que ocupam o mesmo nicho ecolĂłgico que Xylella fastidiosa subsp. pauca (Xfp), em plantas cĂtricas. A produção de siderĂłforos, pelas linhagens de Methylobacterium, foi testada por meio do ensaio de cromoazarol-ĂĄgar (chromeazurol agar assay-CAS), teste de CsĂĄky (tipo hidroxamato) e do teste de Arnow (tipo catecol). AlĂ©m disso, a habilidade de Xfp em utilizar siderĂłforos produzidos por bactĂ©rias endofĂticas, como fonte de ferro, in vitro, foi avaliada. Todas as 37 linhagens de Methylobacterium spp. testadas foram positivas para a produção de siderĂłforos, pelo teste CAS-ĂĄgar. Methylobacterium spp. foram capazes de produzir siderĂłforos do tipo hidroxamato, mas nĂŁo do tipo catecol. O crescimento in vitro de Xfp foi estimulado pela presença de siderĂłforos no sobrenadante de Methylobacterium mesophilicum endofĂtica