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( Jenny M. Blamey ) 생화학분자생물학회 2012 BMB Reports Vol.45 No.2
Glutamate dehydrogenase from axenic bacterial cultures of a new microorganism, called GWE1, isolated from the interior of a sterilization drying oven, was purified by anion-exchange and molecular-exclusion liquid chromatography. The apparent molecular mass of the native enzyme was 250.5 kDa and was shown to be an hexamer with similar subunits of molecular mass 40.5 kDa. For glutamate oxidation, the enzyme showed an optimal pH and temperature of 8.0 and 70oC, respectively. In contrast to other glutamate dehydrogenases isolated from bacteria, the enzyme isolated in this study can use both NAD+ and NADP+ as electron acceptors, displaying more affinity for NADP+ than for NAD+. No activity was detected with NADH or NADPH, 2-oxoglutarate and ammonia. The enzyme was exceptionally thermostable, maintaining more than 70% of activity after incubating at 100oC for more than five hours suggesting being one of the most thermoestable enzymes reported in the family of dehydrogenases. [BMB reports 2012; 45(2): 91-95].
Facilitating Change: Roles of the Early Childhood Literacy Coach
Martha Buell,Myae Han,Katrin L. Blamey,Carol Vukelich 환태평양유아교육연구학회 2010 Asia-Pacific journal of research in early childhoo Vol.4 No.2
This qualitative study sought to explicate the roles Early Childhood Literacy coaches played in a federally-funded project to improve early language and literacy instruction for preschool children. Across three Head Start sites, participants included classroom teachers, literacy coaches, center coordinators, and program coordinators. Structured interviews were conducted and analyzed to understand the roles assumed by coaches who served preschool teachers.
Resistance to Hypoosmotic Shock of Liposomes Containing Novel Pigments from an Antarctic Bacterium
Correa-Llanten, Daniela N.,Amenabar, Maximiliano J.,Blamey, Jenny M. The Korean Society for Microbiology and Biotechnol 2012 한국미생물·생명공학회지 Vol.40 No.3
Although the antioxidant capacity of carotenoids and their role in regulating membrane fluidity have been well studied, their ability to confer resistance to hypoosmotic shock is poorly understood. In this work, we analyzed the effect of a mixture of carotenoid pigments obtained from an Antarctic microorganism belonging to the genus Pedobacter on liposomal resistance to hypoosmotic conditions. Intercalation of pigments into liposomal structures resulted in an improvement of membrane resistance by decreasing the percentage of calcein released in comparison to that by liposomes without pigments. Due to these properties, such pigments could be useful for biotechnological applications.
Resistance to Hypoosmotic Shock of Liposomes Containing Novel Pigments from an Antarctic Bacterium
Daniela N. Correa-Llanten,Maximiliano J. Amenabar,Jenny M. Blamey 한국미생물·생명공학회 2012 한국미생물·생명공학회지 Vol.40 No.3
Although the antioxidant capacity of carotenoids and their role in regulating membrane fluidity have been well studied, their ability to confer resistance to hypoosmotic shock is poorly understood. In this work, we analyzed the effect of a mixture of carotenoid pigments obtained from an Antarctic microorganism belonging to the genus Pedobacter on liposomal resistance to hypoosmotic conditions. Intercalation of pigments into liposomal structures resulted in an improvement of membrane resistance by decreasing the percentage of calcein released in comparison to that by liposomes without pigments. Due to these properties, such pigments could be useful for biotechnological applications.
Antioxidant Capacity of Novel Pigments from an Antarctic Bacterium
Daniela N. Correa-Llantén,Maximiliano J. Amenábar,Jenny M. Blamey 한국미생물학회 2012 The journal of microbiology Vol.50 No.3
In Antarctica microorganisms are exposed to several conditions that trigger the generation of reactive oxygen species, such as high UV radiation. Under these conditions they must have an important antioxidant defense system in order to prevent oxidative damage. One of these defenses are pigments which are part of the non-enzymatic antioxidant mechanisms. In this work we focused on the antioxidant capacity of pigments from an Antarctic microorganism belonging to Pedobacter genus. This microorganism produces different types of pigments which belong to the carotenoids group. The antioxidant capacity of a mix of pigments was analyzed by three different methods: 1,1-diphenyl-2-picrylhydrazyl, ROS detection and oxygen electrode. The results obtained from these approaches indicate that the mix of pigments has a strong antioxidant capacity. The oxidative damage induced by UVB exposure to liposomes was also analyzed. Intercalated pigments within the liposomes improved its resistance to lipid peroxidation. Based on the analysis carried out along this research we conclude that the antioxidant properties of the mix of pigments protect this bacterium against oxidative damage. These properties make this mix of pigments a powerful antioxidant mixture with potential biotechnological applications.
Resistance to Hypoosmotic Shock of Liposomes Containing Novel Pigments from an Antarctic Bacterium
( Correa Llanten ),( Daniela N. ),( Maximiliano J. Amenabar ),( Jenny M. Blamey ) 한국미생물생명공학회(구 한국산업미생물학회) 2012 한국미생물·생명공학회지 Vol.40 No.3
Although the antioxidant capacity of carotenoids and their role in regulating membrane fluidity have been well studied, their ability to confer resistance to hypoosmotic shock is poorly understood. In this work, we analyzed the effect of a mixture of carotenoid pigments obtained from an Antarctic microorganism belonging to the genus Pedobacter on liposomal resistance to hypoosmotic conditions. Intercalation of pigments intoliposomal structures resulted in an improvement of membrane resistance by decreasing the percentage of calcein released in comparison to that by liposomes without pigments. Due to these properties, such pigments could be useful for biotechnological applications.