Extracellular enzymes with glucanase activities are an important component of actinomycete-fungus antagonism. Streptomyces sp. EF-14 has been previously identified as one of the most potent antagonists of Phytophthora spp. A beta-1,6-glucanase (EC 3.2.1.75; glucan endo-1,6-beta-glucosidase) was purified by four chromatographic steps from the culture supernatant of strain EF-14 grown on a medium with lyophilized cells of Candida utilis as main nutrient source. The glucanase level in this medium followed a characteristic pattern in which the rise of beta-1,6-glucanase activity always preceded that of beta-1,3-glucanase. The molecular mass of the enzyme was estimated to be 65 kDa and the pI approximately 5.5. It hydrolyzed pustulan by an endo-mechanism generating gentiobiose and glucose as final products. Laminarin was not hydrolyzed indicating that the enzyme does not recognize beta-1,6-links flanked by beta-1,3-links. No significant clearing of yeast cell walls in liquid suspensions or in agar plates was observed indicating that this beta-1,6-glucanase is a non-lytic enzyme. This is the first beta-1,6-glucanase characterized from an actinomycete.
Deux réformes successives, la mise en place de groupes de médecine de famille (GMF) et l’instauration de centres de santé et de services sociaux (CSSS) et de réseaux locaux de services (RLS), ont été introduites depuis 2002 au Québec. Celles-ci ont donné naissance à une nouvelle dynamique entre le réseau public et les partenaires de la communauté, dont les médecins, pour l’organisation des services de première ligne. La collaboration entre intervenants autrement isolés se développe et leurs initiatives se font plus importantes. Certaines conditions permettant la valorisation de la première ligne se mettent aussi en place. Le présent article résume les changements en cours et décrit plus particulièrement comment les médecins en pratique privée et les institutions publiques profitent de cette opportunité pour trouver des solutions à leurs attentes respectives
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