Cytomegalovirus(CMV)infection of the gastrointestinal (GI)tract has been reported in both immunocompetent and,more frequently,in immunocompromised patients.We describe a case of a 19-year-old male who developed CMV in...Cytomegalovirus(CMV)infection of the gastrointestinal (GI)tract has been reported in both immunocompetent and,more frequently,in immunocompromised patients.We describe a case of a 19-year-old male who developed CMV infection of the terminal ileum while receiving immunosuppression for lupus nephritis. This was a distinctly unusual site of infection which clinically mimicked Crohn's ileitis.We note that reports of terminal ileal CMV infection have been infrequent. Despite a complicated hospital course,ganciclovir therapy was effective in resolving his symptoms and normalizing his ileal mucosa.This report highlights the importance of accurate histological diagnosis and clinical follow-up of lupus patients with GI symptoms undergoing intense immunosuppression.展开更多
[Objective] The aim of this study was to analyze and forecast the transmission trend of highly pathogenic porcine reproductive and respiratory syndrome（HP-PRRS）by mathematical model.[Method]The pigs were divided int...[Objective] The aim of this study was to analyze and forecast the transmission trend of highly pathogenic porcine reproductive and respiratory syndrome（HP-PRRS）by mathematical model.[Method]The pigs were divided into the susceptible population S,the incidence population I and the removed population R.Dynamics models of transmission rate β（t）,recovery rate γ（t）and incidence rate δ（t）were analyzed,and the mathematical models of diseased pigs each day I（t）and healthy pigs each day H（t）of HP-PRRS were established in transmission process.[Result]Transmission rate β（t）,recover rate γ（t）and incidence rate δ（t）were conformed to the results of the actual figures,and the mathematical models of diseased pigs each day I（t）and healthy pigs each day H（t）of HP-PRRS were accorded with the objective law of transmission.[Conclusion]This mathematical model could be better used to analyze the transmission trend of HP-PRRS.展开更多
In longwall mines, atmospheric pressure fluctuations can disturb the pressure balance between the gob and the ventilated working area, resulting in a phenomenon known as ‘‘gob breathing". Gob breathing triggers...In longwall mines, atmospheric pressure fluctuations can disturb the pressure balance between the gob and the ventilated working area, resulting in a phenomenon known as ‘‘gob breathing". Gob breathing triggers gas flows across the gob and the working areas and may result in a condition where an oxygen deficient mixture or a methane accumulation in the gob flows into the face area. Computational Fluid Dynamics(CFDs) modeling was carried out to analyze this phenomenon and its impact on the development of an explosive mixture in a bleeder-ventilated panel scheme. Simulation results indicate that the outgassing and ingassing across the gob and the formation of Explosive Gas Zones(EGZs) are directly affected by atmospheric pressure changes. In the location where methane zones interface with mine air, EGZ fringes may form along the face and in the bleeder entries. These findings help assess the methane ignition and explosion risks associated with fluctuating atmospheric pressures.展开更多
文摘Cytomegalovirus(CMV)infection of the gastrointestinal (GI)tract has been reported in both immunocompetent and,more frequently,in immunocompromised patients.We describe a case of a 19-year-old male who developed CMV infection of the terminal ileum while receiving immunosuppression for lupus nephritis. This was a distinctly unusual site of infection which clinically mimicked Crohn's ileitis.We note that reports of terminal ileal CMV infection have been infrequent. Despite a complicated hospital course,ganciclovir therapy was effective in resolving his symptoms and normalizing his ileal mucosa.This report highlights the importance of accurate histological diagnosis and clinical follow-up of lupus patients with GI symptoms undergoing intense immunosuppression.
文摘[Objective] The aim of this study was to analyze and forecast the transmission trend of highly pathogenic porcine reproductive and respiratory syndrome（HP-PRRS）by mathematical model.[Method]The pigs were divided into the susceptible population S,the incidence population I and the removed population R.Dynamics models of transmission rate β（t）,recovery rate γ（t）and incidence rate δ（t）were analyzed,and the mathematical models of diseased pigs each day I（t）and healthy pigs each day H（t）of HP-PRRS were established in transmission process.[Result]Transmission rate β（t）,recover rate γ（t）and incidence rate δ（t）were conformed to the results of the actual figures,and the mathematical models of diseased pigs each day I（t）and healthy pigs each day H（t）of HP-PRRS were accorded with the objective law of transmission.[Conclusion]This mathematical model could be better used to analyze the transmission trend of HP-PRRS.
基金the financial support of the National Institute for Occupational Safety and Health–United States(No.211-2014-60050)
文摘In longwall mines, atmospheric pressure fluctuations can disturb the pressure balance between the gob and the ventilated working area, resulting in a phenomenon known as ‘‘gob breathing". Gob breathing triggers gas flows across the gob and the working areas and may result in a condition where an oxygen deficient mixture or a methane accumulation in the gob flows into the face area. Computational Fluid Dynamics(CFDs) modeling was carried out to analyze this phenomenon and its impact on the development of an explosive mixture in a bleeder-ventilated panel scheme. Simulation results indicate that the outgassing and ingassing across the gob and the formation of Explosive Gas Zones(EGZs) are directly affected by atmospheric pressure changes. In the location where methane zones interface with mine air, EGZ fringes may form along the face and in the bleeder entries. These findings help assess the methane ignition and explosion risks associated with fluctuating atmospheric pressures.
