The Experts below are selected from a list of 4581 Experts worldwide ranked by ideXlab platform
Donghyun Kang - One of the best experts on this subject based on the ideXlab platform.
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inactivation of escherichia coli o157 h7 salmonella typhimurium and listeria monocytogenes on cherry tomatoes and oranges by superheated Steam
Food Research International, 2018Co-Authors: Gahee Ban, Donghyun KangAbstract:Abstract This study was performed to compare the effectiveness of Saturated Steam and superheated Steam for the inactivation of Escherichia coli O157:H7, Salmonella typhimurium, and Listeria monocytogenes on the surface of cherry tomatoes and oranges. It also determined the effect of the Steam processes on the color, texture, Vitamin C content, and antioxidant capacity and changes in these parameters during chilled storage. Cherry tomatoes and oranges inoculated with the three foodborne pathogens were treated with Saturated Steam at 100 °C and superheated Steam at 125, 150, 175, and 200 °C for various time intervals. After the cherry tomatoes and oranges were exposed to superheated Steam at 200 °C for 3 or 20 s, all tested pathogens were reduced to below the detection limit (1 or 1.7 log, respectively) without significant changes in color, texture, vitamin C content, and antioxidant capacity (P > .05) at 4 °C for up to 9 days. Our results suggest that superheated Steam treatment can be effective at decreasing pathogen populations when compared to Saturated Steam, without significant quality deterioration, and thus, this technique demonstrates great potential to improve the microbial safety of fresh produce.
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a comparison of Saturated Steam and superheated Steam for inactivation of escherichia coli o157 h7 salmonella typhimurium and listeria monocytogenes biofilms on polyvinyl chloride and stainless steel
Food Control, 2014Co-Authors: Gahee Ban, Hyunjin Yoon, Donghyun KangAbstract:Abstract This study was performed to compare the effectiveness of Saturated Steam (SS) and superheated Steam (SHS) in the inactivation of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes biofilms on polyvinyl chloride (PVC) and stainless steel. Biofilms were formed on PVC and stainless steel coupons by using a mixture of three strains each of three foodborne pathogens at 25 °C. After biofilm development, PVC and stainless steel coupons were treated with SS at 100 °C and SHS at 125, 150, 175, and 200 °C for 5, 10, 20, and 30 s on both sides. The viable cell numbers of biofilms were significantly (p
Gahee Ban - One of the best experts on this subject based on the ideXlab platform.
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inactivation of escherichia coli o157 h7 salmonella typhimurium and listeria monocytogenes on cherry tomatoes and oranges by superheated Steam
Food Research International, 2018Co-Authors: Gahee Ban, Donghyun KangAbstract:Abstract This study was performed to compare the effectiveness of Saturated Steam and superheated Steam for the inactivation of Escherichia coli O157:H7, Salmonella typhimurium, and Listeria monocytogenes on the surface of cherry tomatoes and oranges. It also determined the effect of the Steam processes on the color, texture, Vitamin C content, and antioxidant capacity and changes in these parameters during chilled storage. Cherry tomatoes and oranges inoculated with the three foodborne pathogens were treated with Saturated Steam at 100 °C and superheated Steam at 125, 150, 175, and 200 °C for various time intervals. After the cherry tomatoes and oranges were exposed to superheated Steam at 200 °C for 3 or 20 s, all tested pathogens were reduced to below the detection limit (1 or 1.7 log, respectively) without significant changes in color, texture, vitamin C content, and antioxidant capacity (P > .05) at 4 °C for up to 9 days. Our results suggest that superheated Steam treatment can be effective at decreasing pathogen populations when compared to Saturated Steam, without significant quality deterioration, and thus, this technique demonstrates great potential to improve the microbial safety of fresh produce.
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a comparison of Saturated Steam and superheated Steam for inactivation of escherichia coli o157 h7 salmonella typhimurium and listeria monocytogenes biofilms on polyvinyl chloride and stainless steel
Food Control, 2014Co-Authors: Gahee Ban, Hyunjin Yoon, Donghyun KangAbstract:Abstract This study was performed to compare the effectiveness of Saturated Steam (SS) and superheated Steam (SHS) in the inactivation of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes biofilms on polyvinyl chloride (PVC) and stainless steel. Biofilms were formed on PVC and stainless steel coupons by using a mixture of three strains each of three foodborne pathogens at 25 °C. After biofilm development, PVC and stainless steel coupons were treated with SS at 100 °C and SHS at 125, 150, 175, and 200 °C for 5, 10, 20, and 30 s on both sides. The viable cell numbers of biofilms were significantly (p
Hyunjin Yoon - One of the best experts on this subject based on the ideXlab platform.
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a comparison of Saturated Steam and superheated Steam for inactivation of escherichia coli o157 h7 salmonella typhimurium and listeria monocytogenes biofilms on polyvinyl chloride and stainless steel
Food Control, 2014Co-Authors: Gahee Ban, Hyunjin Yoon, Donghyun KangAbstract:Abstract This study was performed to compare the effectiveness of Saturated Steam (SS) and superheated Steam (SHS) in the inactivation of Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes biofilms on polyvinyl chloride (PVC) and stainless steel. Biofilms were formed on PVC and stainless steel coupons by using a mixture of three strains each of three foodborne pathogens at 25 °C. After biofilm development, PVC and stainless steel coupons were treated with SS at 100 °C and SHS at 125, 150, 175, and 200 °C for 5, 10, 20, and 30 s on both sides. The viable cell numbers of biofilms were significantly (p
Amir Abbas Tanha - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of a tri generation system based on micro gas turbine with a Steam ejector refrigeration system
Energy, 2010Co-Authors: Mohammad Ameri, Ali Behbahaninia, Amir Abbas TanhaAbstract:In the present work, performance of new configuration of Micro-gas turbine cogeneration and tri-generation systems, with a Steam ejector refrigeration system and Heat recovery Steam Generator (HRSG) are studied. A micro-gas turbine cycle produces 200 KW power and exhaust gases of this micro-gas turbine are recovered in an HRSG. The main part of Saturated Steam in HRSG is used through a Steam ejector refrigeration system to produce cooling in summer. In winter, this part of Saturated Steam is used to produce heating. In the first part of this paper, performance evaluation of this system with respect to Energy Utilization Factor (EUF), Fuel Energy Saving Ratio (FESR), thermal efficiency, pinch point temperature difference, net power to evaporator cooling load and power to heat ratio is carried out. It has been shown that by using the present cogeneration system, one can save fuel consumption from about 23% in summer up to 33% in winter in comparison with separate generation of heating, cooling and electricity.
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thermodynamic analysis of a tri generation system based on micro gas turbine with a Steam ejector refrigeration system
Energy, 2010Co-Authors: Mohammad Ameri, Ali Behbahaninia, Amir Abbas TanhaAbstract:Abstract In the present work, performance of new configuration of Micro-gas turbine cogeneration and tri-generation systems, with a Steam ejector refrigeration system and Heat recovery Steam Generator (HRSG) are studied. A micro-gas turbine cycle produces 200 KW power and exhaust gases of this micro-gas turbine are recovered in an HRSG. The main part of Saturated Steam in HRSG is used through a Steam ejector refrigeration system to produce cooling in summer. In winter, this part of Saturated Steam is used to produce heating. In the first part of this paper, performance evaluation of this system with respect to Energy Utilization Factor (EUF), Fuel Energy Saving Ratio (FESR), thermal efficiency, pinch point temperature difference, net power to evaporator cooling load and power to heat ratio is carried out. It has been shown that by using the present cogeneration system, one can save fuel consumption from about 23% in summer up to 33% in winter in comparison with separate generation of heating, cooling and electricity. In the second part of this paper, exergy analysis of the system has been done. It has been shown that combustion chamber; HRSG and heat exchanger are recognized as the largest sources of exergy losses respectively.
J Peters - One of the best experts on this subject based on the ideXlab platform.
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suitability of bacillus subtilis and bacillus stearothermophilus spores as test organism bioindicators for detecting superheating of Steam
International journal of hygiene and environmental medicine, 1997Co-Authors: Gottfried Spicher, J PetersAbstract:: Biological indicators used to test sterilisation procedures for their efficacy consist of a so-called germ carrier to which the microorganisms used as test organisms adhere. In previous papers we demonstrated that carriers made of filter paper on contact with Saturated Steam show superheating while carriers made of glass fibre fleece as well as wetted filter paper do not. Using spores of Bacillus subtilis and Bacillus stearothermophilus as test organisms we have now investigated whether and to what extent carrier superheating affects the characteristic values (t50%) of these biological indicators. The indicators were exposed to Saturated Steam at 100 degrees C (B. subtilis) or 120 degrees C (B. stearothermophilus) under three different exposure conditions: 1. dry (i.e. conditioned to 45% relative humidity before introduction into the sterilising chamber), freely accessible; 2. dry with a substratum and a cover of filter card-board; 3. wet (moistened with twice distilled water before introduction into the sterilising chamber), freely accessible. For previously selected exposure periods, the incidence of indicators with surviving test organisms was determined. The reaction pattern of bioindicators with spores of B. stearothermophilus was different from that of bioindicators with spores of B. subtilis. For B. subtilis, the incidence of bioindicators exhibiting surviving test organisms depended on the nature of the carries as well as on the exposure conditions. On filter paper carriers, t50% increased in the order "wet, freely accessible", "dry, freely accessible", "dry, between filter card-board". On dry and wetted glass fibre fleece, resistance was approximately the same; when the indicators were sandwiched between layers of filter card-board, t50% increased. For B. stearothermophilus, t50% was largely dependent on the carrier material alone. The values obtained for filter paper were invariably much lower than those for glass fibre fleece. As the results show, using spores of B. subtilis it is possible to detect superheating, but the Steam resistance of the spores is relatively low. Spores of B. stearothermophilus are of high Steam resistance but they are practically unsuitable for detecting superheating. It is imperative to search for a test organism the resistance of which against Steam is sufficiently high and which at the same time is capable of reacting to superheating (equivalent to reduced humidity) by a sufficiently large increase in resistance.
