The Experts below are selected from a list of 59394 Experts worldwide ranked by ideXlab platform
Nathalie Gontard - One of the best experts on this subject based on the ideXlab platform.
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effective moisture diffusivity modelling versus food structure and hygroscopicity
Food Chemistry, 2008Co-Authors: Elisabeth Roca, Valérie Guillard, Bertrand Broyart, Stephane Guilbert, Nathalie GontardAbstract:Effective moisture diffusivities(D-eff) for model food systems presenting distinct structure and water sensibility were identified at various levels of hydration. Experimental moisture sorption kinetics with a controlled atmosphere microbalance were analyzed using distinct Fickian models with specific assumptions. Taking into account the deformation and the External Resistance to mass transfer, higher values of D-eff were identified specially for hygroscopic dense products in the range of high water activity. The difference of impact of the model assumptions on D-eff depending on the investigated water activity range and food material was related to the structure and the equilibrium moisture sorption properties.
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Effective moisture diffusivity modelling versus food structure and hygroscopicity
Food Chemistry, 2006Co-Authors: Valérie Guillard, Bertrand Broyart, Stephane Guilbert, Nathalie GontardAbstract:Effective moisture diffusivities(D-eff) for model food systems presenting distinct structure and water sensibility were identified at various levels of hydration. Experimental moisture sorption kinetics with a controlled atmosphere microbalance were analyzed using distinct Fickian models with specific assumptions. Taking into account the deformation and the External Resistance to mass transfer, higher values of D-eff were identified specially for hygroscopic dense products in the range of high water activity. The difference of impact of the model assumptions on D-eff depending on the investigated water activity range and food material was related to the structure and the equilibrium moisture sorption properties.
Kazunori Yasuda - One of the best experts on this subject based on the ideXlab platform.
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Acute effects of dynamic stretching exercise on power output during concentric dynamic constant External Resistance leg extension.
Journal of strength and conditioning research, 2007Co-Authors: Taichi Yamaguchi, Kojiro Ishii, Masanori Yamanaka, Kazunori YasudaAbstract:The purpose of the present study was to clarify the acute effect of dynamic stretching exercise on muscular performance during concentric dynamic constant External Resistance (DCER, formally called isotonic) muscle actions under various loads. Concentric DCER leg extension power outputs were measured in 12 healthy male students after 2 types of pretreatment. The pretreatments were: (a) dynamic stretching treatment including 2 types of dynamic stretching exercises of leg extensors and the other 2 types of dynamic stretching exercises simulating the leg extension motion (2 sets of 15 times each with 30-second rest periods between sets; total duration: about 8 minutes), and (b) nonstretching treatment by resting for 8 minutes in a sitting position. Loads during measurement of the power output were set to 5, 30, and 60% of the maximum voluntary contractile (MVC) torque with isometric leg extension in each subject. The power output after the dynamic stretching treatment was significantly (p < 0.05) greater than that after the nonstretching treatment under each load (5% MVC: 468.4 +/- 102.6 W vs. 430.1 +/- 73.0 W; 30% MVC: 520.4 +/- 108.5 W vs. 491.0 +/- 93.0 W; 60% MVC: 487.1 +/- 100.6 W vs. 450.8 +/- 83.7 W). The present study demonstrated that dynamic stretching routines, such as dynamic stretching exercise of target muscle groups and dynamic stretching exercise simulating the actual motion pattern, significantly improve power output with concentric DCER muscle actions under various loads. These results suggested that dynamic stretching routines in warm-up protocols enhance power performance because common power activities are carried out by DCER muscle actions under various loads.
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acute effect of static stretching on power output during concentric dynamic constant External Resistance leg extension
Journal of Strength and Conditioning Research, 2006Co-Authors: Taichi Yamaguchi, Kojiro Ishii, Masanori Yamanaka, Kazunori YasudaAbstract:The purpose of the present study was to clarify the effect of static stretching on muscular performance during concentric isotonic (dynamic constant External Resistance [DCER]) muscle actions under various loads. Concentric DCER leg extension power outputs were assessed in 12 healthy male subjects after 2 types of pretreatment. The pretreatments included (a) static stretching treatment performing 6 types of static stretching on leg extensors (4 sets of 30 seconds each with 20-second rest periods; total duration 20 minutes) and (b) nonstretching treatment by resting for 20 minutes in a sitting position. Loads during assessment of the power output were set to 5, 30, and 60% of the maximum voluntary contractile (MVC) torque with isometric leg extension in each subject. The peak power output following the static stretching treatment was significantly (p < 0.05) lower than that following the nonstretching treatment under each load (5% MVC, 418.0 +/- 82.2 W vs. 466.2 +/- 89.5 W; 30% MVC, 506.4 +/- 82.8 W vs. 536.4 +/- 97.0 W; 60% MVC, 478.6 +/- 77.5 W vs. 523.8 +/- 97.8 W). The present study demonstrated that relatively extensive static stretching significantly reduces power output with concentric DCER muscle actions under various loads. Common power activities are carried out by DCER muscle actions under various loads. Therefore, the result of the present study suggests that relatively extensive static stretching decreases power performance.
Andrea Giordano - One of the best experts on this subject based on the ideXlab platform.
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sustainable power production in a membrane less and mediator less synthetic wastewater microbial fuel cell
Bioresource Technology, 2009Co-Authors: Aba Aldrovandi, Enrico Marsili, Loredana Stante, Patrizia Paganin, Silvia Tabacchioni, Andrea GiordanoAbstract:Abstract Microbial fuel cells (MFCs) fed with wastewater are currently considered a feasible strategy for production of renewable electricity. A membrane-less MFC with biological cathode was built from a compact wastewater treatment reactor and fed with synthetic wastewater. When operated with an External Resistance of 250 Ω, the MFC produced a long-term power of about 70 mW/m 2 for 10 months. Denaturing Gradient Gel Electrophoresis (DGGE) analysis of the cathode biomass when the MFC was closed on a 2100 Ω External Resistance showed that the sequenced bands were affiliated with Firmicutes , α - Proteobacteria, β-Proteobacteria , γ - Proteobacteria, and Bacteroidetes groups. When the External Resistance was varied between 250 and 2100 Ω, minimum sustainable Resistance decreased from 900 to 750 Ω, while maximum sustainable power output decreased from 32 to 28 mW/m 2 . It is likely that these effects were caused by changes in the microbial ecology of anodic and cathodic biomass attached to the electrodes. Results suggest that cathodic biomass enrichment in “electroactive” bacteria may improve MFCs power output in a similar fashion to what has been already observed for anodic biomass.
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sustainable power production in a membrane less and mediator less synthetic wastewater microbial fuel cell
Bioresource Technology, 2009Co-Authors: Aba Aldrovandi, Enrico Marsili, Loredana Stante, Patrizia Paganin, Silvia Tabacchioni, Andrea GiordanoAbstract:Microbial fuel cells (MFCs) fed with wastewater are currently considered a feasible strategy for production of renewable electricity. A membrane-less MFC with biological cathode was built from a compact wastewater treatment reactor and fed with synthetic wastewater. When operated with an External Resistance of 250 Omega, the MFC produced a long-term power of about 70 mW/m(2) for 10 months. Denaturing Gradient Gel Electrophoresis (DGGE) analysis of the cathode biomass when the MFC was closed on a 2100 Omega External Resistance showed that the sequenced bands were affiliated with Firmicutes, alpha-Proteobacteria,beta-Proteobacteria, gamma-Proteobacteria, and Bacteroidetes groups. When the External Resistance was varied between 250 and 2100 Omega, minimum sustainable Resistance decreased from 900 to 750 Omega, while maximum sustainable power output decreased from 32 to 28 mW/m(2). It is likely that these effects were caused by changes in the microbial ecology of anodic and cathodic biomass attached to the electrodes. Results suggest that cathodic biomass enrichment in "electroactive" bacteria may improve MFCs power output in a similar fashion to what has been already observed for anodic biomass.
Taichi Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Acute effects of dynamic stretching exercise on power output during concentric dynamic constant External Resistance leg extension.
Journal of strength and conditioning research, 2007Co-Authors: Taichi Yamaguchi, Kojiro Ishii, Masanori Yamanaka, Kazunori YasudaAbstract:The purpose of the present study was to clarify the acute effect of dynamic stretching exercise on muscular performance during concentric dynamic constant External Resistance (DCER, formally called isotonic) muscle actions under various loads. Concentric DCER leg extension power outputs were measured in 12 healthy male students after 2 types of pretreatment. The pretreatments were: (a) dynamic stretching treatment including 2 types of dynamic stretching exercises of leg extensors and the other 2 types of dynamic stretching exercises simulating the leg extension motion (2 sets of 15 times each with 30-second rest periods between sets; total duration: about 8 minutes), and (b) nonstretching treatment by resting for 8 minutes in a sitting position. Loads during measurement of the power output were set to 5, 30, and 60% of the maximum voluntary contractile (MVC) torque with isometric leg extension in each subject. The power output after the dynamic stretching treatment was significantly (p < 0.05) greater than that after the nonstretching treatment under each load (5% MVC: 468.4 +/- 102.6 W vs. 430.1 +/- 73.0 W; 30% MVC: 520.4 +/- 108.5 W vs. 491.0 +/- 93.0 W; 60% MVC: 487.1 +/- 100.6 W vs. 450.8 +/- 83.7 W). The present study demonstrated that dynamic stretching routines, such as dynamic stretching exercise of target muscle groups and dynamic stretching exercise simulating the actual motion pattern, significantly improve power output with concentric DCER muscle actions under various loads. These results suggested that dynamic stretching routines in warm-up protocols enhance power performance because common power activities are carried out by DCER muscle actions under various loads.
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acute effect of static stretching on power output during concentric dynamic constant External Resistance leg extension
Journal of Strength and Conditioning Research, 2006Co-Authors: Taichi Yamaguchi, Kojiro Ishii, Masanori Yamanaka, Kazunori YasudaAbstract:The purpose of the present study was to clarify the effect of static stretching on muscular performance during concentric isotonic (dynamic constant External Resistance [DCER]) muscle actions under various loads. Concentric DCER leg extension power outputs were assessed in 12 healthy male subjects after 2 types of pretreatment. The pretreatments included (a) static stretching treatment performing 6 types of static stretching on leg extensors (4 sets of 30 seconds each with 20-second rest periods; total duration 20 minutes) and (b) nonstretching treatment by resting for 20 minutes in a sitting position. Loads during assessment of the power output were set to 5, 30, and 60% of the maximum voluntary contractile (MVC) torque with isometric leg extension in each subject. The peak power output following the static stretching treatment was significantly (p < 0.05) lower than that following the nonstretching treatment under each load (5% MVC, 418.0 +/- 82.2 W vs. 466.2 +/- 89.5 W; 30% MVC, 506.4 +/- 82.8 W vs. 536.4 +/- 97.0 W; 60% MVC, 478.6 +/- 77.5 W vs. 523.8 +/- 97.8 W). The present study demonstrated that relatively extensive static stretching significantly reduces power output with concentric DCER muscle actions under various loads. Common power activities are carried out by DCER muscle actions under various loads. Therefore, the result of the present study suggests that relatively extensive static stretching decreases power performance.
Valérie Guillard - One of the best experts on this subject based on the ideXlab platform.
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effective moisture diffusivity modelling versus food structure and hygroscopicity
Food Chemistry, 2008Co-Authors: Elisabeth Roca, Valérie Guillard, Bertrand Broyart, Stephane Guilbert, Nathalie GontardAbstract:Effective moisture diffusivities(D-eff) for model food systems presenting distinct structure and water sensibility were identified at various levels of hydration. Experimental moisture sorption kinetics with a controlled atmosphere microbalance were analyzed using distinct Fickian models with specific assumptions. Taking into account the deformation and the External Resistance to mass transfer, higher values of D-eff were identified specially for hygroscopic dense products in the range of high water activity. The difference of impact of the model assumptions on D-eff depending on the investigated water activity range and food material was related to the structure and the equilibrium moisture sorption properties.
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Effective moisture diffusivity modelling versus food structure and hygroscopicity
Food Chemistry, 2006Co-Authors: Valérie Guillard, Bertrand Broyart, Stephane Guilbert, Nathalie GontardAbstract:Effective moisture diffusivities(D-eff) for model food systems presenting distinct structure and water sensibility were identified at various levels of hydration. Experimental moisture sorption kinetics with a controlled atmosphere microbalance were analyzed using distinct Fickian models with specific assumptions. Taking into account the deformation and the External Resistance to mass transfer, higher values of D-eff were identified specially for hygroscopic dense products in the range of high water activity. The difference of impact of the model assumptions on D-eff depending on the investigated water activity range and food material was related to the structure and the equilibrium moisture sorption properties.
