In the present work, a comparative study of antibacterial activity and synergistic effects of triangular silver nanoparticles in combination with two standard antibiotics is discussed for Staphylococcus aureus and Pse...In the present work, a comparative study of antibacterial activity and synergistic effects of triangular silver nanoparticles in combination with two standard antibiotics is discussed for Staphylococcus aureus and Pseudomonas aeruginosa. A green route was developed to synthesise silver nanoparticles in which silver oxalate was taken as precursor, black tea leaves extract as surfactant and chitin as a stabilizing agent. A grey coloured colloidal solution of silver nanoparticles was obtained which was characterized by using various techniques like X-ray diffractometer (XRD), transmission electron microscopy (TEM) and UV-visible spectroscopy. Anti-bacterial studies gave approximately equal inhibition zones for both the combinations which states that silver nanoparticles are to be equally effective and synergistic effects were clearly observed in case of P. aeruginosa.展开更多
Pathogen microorganisms exist in various environments such as dairy processing facilities. They are not easily eliminated, and significantly raise the risk of bacterial contamination. The inhibition ability of a novel...Pathogen microorganisms exist in various environments such as dairy processing facilities. They are not easily eliminated, and significantly raise the risk of bacterial contamination. The inhibition ability of a novel type 304 Cu-bearing stainless steel （304CUSS） with nano-sized Cu-rich precipitates against Staph-ylococcus aureus （S. aureus） and Pseudomonas aeruginosa （P. aeruginosa） added whole milk was investigated in this study. The results showed that after 24 h contact, the inhibition rates of the 304CUSS against S. aureus and P. aeruginosa added whole milk reached 99.2% ± 0.3% and 99.3% ± 0.2%, respectively, in contrast with the 304SS. In the plain whole milk, the inhibition rate of the 304CUSS also reached 66.9% ± 2.0% compared with the 304SS. The results demonstrated that the 304CUSS killed majority of the planktonic bacteria, and inhibited sessile bacteria adherence to the steel surface in the whole milk with and without bacteria addition, significantly reducing the bacterial growth rate. These research outcomes explicitly show an application potential of this novel antibacterial stainless steel in the dairy related food industry.展开更多
为提升化妆品中金黄色葡萄球菌检测能力,加强化妆品微生物检测质量控制,增强实验室竞争能力,本实验室参加中国食品药品检验研究院组织的NIFDC-PT-380化妆品中金黄色葡萄球菌检出能力验证。依据能力验证作业指导书和《化妆品卫生规范》(2...为提升化妆品中金黄色葡萄球菌检测能力,加强化妆品微生物检测质量控制,增强实验室竞争能力,本实验室参加中国食品药品检验研究院组织的NIFDC-PT-380化妆品中金黄色葡萄球菌检出能力验证。依据能力验证作业指导书和《化妆品卫生规范》(2015年版)进行金黄色葡萄球菌的检验,同时采用VITEK2 Compact全自动微生物生化鉴定系统和Autof ms 2000全自动微生物质谱检测系统对样品中分离出的菌种进行鉴定。结果显示,3种方法均未检出金黄色葡萄球菌,且样品TC03800053和样品TC03800054均含有2种微生物,分别为表皮葡萄球菌和弗氏柠檬酸杆菌。2个样品能力验证均取得满意结果。此次能力验证证明了内蒙古自治区药品检验研究院实验室能良好地应用《化妆品卫生规范》(2015年版)开展微生物检测,且具备采用多种方法检测化妆品中金黄色葡萄球菌的检验能力。展开更多
Objective Recombinase-aided polymerase chain reaction(RAP)is a sensitive,single-tube,two-stage nucleic acid amplification method.This study aimed to develop an assay that can be used for the early diagnosis of three t...Objective Recombinase-aided polymerase chain reaction(RAP)is a sensitive,single-tube,two-stage nucleic acid amplification method.This study aimed to develop an assay that can be used for the early diagnosis of three types of bacteremia caused by Staphylococcus aureus(SA),Pseudomonas aeruginosa(PA),and Acinetobacter baumannii(AB)in the bloodstream based on recombinant human mannanbinding lectin protein(M1 protein)-conjugated magnetic bead(M1 bead)enrichment of pathogens combined with RAP.Methods Recombinant plasmids were used to evaluate the assay sensitivity.Common blood influenza bacteria were used for the specific detection.Simulated and clinical plasma samples were enriched with M1 beads and then subjected to multiple recombinase-aided PCR(M-RAP)and quantitative PCR(qPCR)assays.Kappa analysis was used to evaluate the consistency between the two assays.Results The M-RAP method had sensitivity rates of 1,10,and 1 copies/μL for the detection of SA,PA,and AB plasmids,respectively,without cross-reaction to other bacterial species.The M-RAP assay obtained results for<10 CFU/mL pathogens in the blood within 4 h,with higher sensitivity than qPCR.M-RAP and qPCR for SA,PA,and AB yielded Kappa values of 0.839,0.815,and 0.856,respectively(P<0.05).Conclusion An M-RAP assay for SA,PA,and AB in blood samples utilizing M1 bead enrichment has been developed and can be potentially used for the early detection of bacteremia.展开更多
Animal models are essential for the development of new anti-infectious drugs.Although some bacterial infection models have been established in rodents,small primate models are rare.Here,we report on two bacterial infe...Animal models are essential for the development of new anti-infectious drugs.Although some bacterial infection models have been established in rodents,small primate models are rare.Here,we report on two bacterial infection models established in tree shrew（Tupaia belangeri chinensis）.A burnt skin infection model was induced by dropping 5×106 CFU of Staphylococcus aureus on the surface of a wound after a third degree burn.This dose of S.aureus caused persistent infection for 7 days and obvious inflammatory response was observed 4 days after inoculation.A Dacron graft infection model,2×106 CFU of Pseudomonas aeruginosa also caused persistent infection for 6 days,with large amounts of pus observed 3 days after inoculation.These models were used to evaluate the efficacy of levofloxacin（LEV） and cefoperazone（CPZ）,which reduced the viable bacteria in skin to 4log10 and 5log10 CFU/100 mg tissue,respectively.The number of bacteria in graft was significantly reduced by 4log10 CFU/mL treatment compared to the untreated group（P0.05）.These results suggest that two bacterial infection models were successfully established in tree shrew using P.aeruginosa and S.aureus.In addition,tree shrew was susceptible to P.aeruginosa and S.aureus,thus making it an ideal bacterial infection animal model for the evaluation of new antimicrobials.展开更多
碘伏消毒液由碘与聚醇醚类表面活性剂络合而成,为了解其杀菌效果及其他相关性能,采用悬液定量杀菌试验和理化分析方法进行了实验室观察。结果,以含有效碘250 mg/L该消毒液对金黄色葡萄球、大肠杆菌和绿脓杆菌作用1.5 m in,杀灭对数值均&...碘伏消毒液由碘与聚醇醚类表面活性剂络合而成,为了解其杀菌效果及其他相关性能,采用悬液定量杀菌试验和理化分析方法进行了实验室观察。结果,以含有效碘250 mg/L该消毒液对金黄色葡萄球、大肠杆菌和绿脓杆菌作用1.5 m in,杀灭对数值均>5.00,对白色念珠菌作用1.5 m in,杀灭对数值>4.00。现场试验结果表明,用含有效碘2500 mg/L该消毒剂对志愿者手和手臂皮肤擦拭消毒3 m in,对自然菌的杀灭对数值均>1.00。将该消毒液原液于37℃恒温保存6个月,有效碘含量下降率为0.99%。结论,洗得宝碘伏消毒液杀菌效果良好,稳定性较好。展开更多
文摘In the present work, a comparative study of antibacterial activity and synergistic effects of triangular silver nanoparticles in combination with two standard antibiotics is discussed for Staphylococcus aureus and Pseudomonas aeruginosa. A green route was developed to synthesise silver nanoparticles in which silver oxalate was taken as precursor, black tea leaves extract as surfactant and chitin as a stabilizing agent. A grey coloured colloidal solution of silver nanoparticles was obtained which was characterized by using various techniques like X-ray diffractometer (XRD), transmission electron microscopy (TEM) and UV-visible spectroscopy. Anti-bacterial studies gave approximately equal inhibition zones for both the combinations which states that silver nanoparticles are to be equally effective and synergistic effects were clearly observed in case of P. aeruginosa.
基金financially supported by the National Natural Science Foundation of China(Nos.51101154 and 51371168)the National Basic Research Program of China(No.2012CB619101)the UK Royal Academy of Engineering(RAEng.1213RECI052)
文摘Pathogen microorganisms exist in various environments such as dairy processing facilities. They are not easily eliminated, and significantly raise the risk of bacterial contamination. The inhibition ability of a novel type 304 Cu-bearing stainless steel （304CUSS） with nano-sized Cu-rich precipitates against Staph-ylococcus aureus （S. aureus） and Pseudomonas aeruginosa （P. aeruginosa） added whole milk was investigated in this study. The results showed that after 24 h contact, the inhibition rates of the 304CUSS against S. aureus and P. aeruginosa added whole milk reached 99.2% ± 0.3% and 99.3% ± 0.2%, respectively, in contrast with the 304SS. In the plain whole milk, the inhibition rate of the 304CUSS also reached 66.9% ± 2.0% compared with the 304SS. The results demonstrated that the 304CUSS killed majority of the planktonic bacteria, and inhibited sessile bacteria adherence to the steel surface in the whole milk with and without bacteria addition, significantly reducing the bacterial growth rate. These research outcomes explicitly show an application potential of this novel antibacterial stainless steel in the dairy related food industry.
文摘为提升化妆品中金黄色葡萄球菌检测能力,加强化妆品微生物检测质量控制,增强实验室竞争能力,本实验室参加中国食品药品检验研究院组织的NIFDC-PT-380化妆品中金黄色葡萄球菌检出能力验证。依据能力验证作业指导书和《化妆品卫生规范》(2015年版)进行金黄色葡萄球菌的检验,同时采用VITEK2 Compact全自动微生物生化鉴定系统和Autof ms 2000全自动微生物质谱检测系统对样品中分离出的菌种进行鉴定。结果显示,3种方法均未检出金黄色葡萄球菌,且样品TC03800053和样品TC03800054均含有2种微生物,分别为表皮葡萄球菌和弗氏柠檬酸杆菌。2个样品能力验证均取得满意结果。此次能力验证证明了内蒙古自治区药品检验研究院实验室能良好地应用《化妆品卫生规范》(2015年版)开展微生物检测,且具备采用多种方法检测化妆品中金黄色葡萄球菌的检验能力。
基金funded by the National Key R&D Program of China[2021YFC2301102]National Natural Science Foundation of China[82202593]Key R&D Program of Hebei Province[223777100D].
文摘Objective Recombinase-aided polymerase chain reaction(RAP)is a sensitive,single-tube,two-stage nucleic acid amplification method.This study aimed to develop an assay that can be used for the early diagnosis of three types of bacteremia caused by Staphylococcus aureus(SA),Pseudomonas aeruginosa(PA),and Acinetobacter baumannii(AB)in the bloodstream based on recombinant human mannanbinding lectin protein(M1 protein)-conjugated magnetic bead(M1 bead)enrichment of pathogens combined with RAP.Methods Recombinant plasmids were used to evaluate the assay sensitivity.Common blood influenza bacteria were used for the specific detection.Simulated and clinical plasma samples were enriched with M1 beads and then subjected to multiple recombinase-aided PCR(M-RAP)and quantitative PCR(qPCR)assays.Kappa analysis was used to evaluate the consistency between the two assays.Results The M-RAP method had sensitivity rates of 1,10,and 1 copies/μL for the detection of SA,PA,and AB plasmids,respectively,without cross-reaction to other bacterial species.The M-RAP assay obtained results for<10 CFU/mL pathogens in the blood within 4 h,with higher sensitivity than qPCR.M-RAP and qPCR for SA,PA,and AB yielded Kappa values of 0.839,0.815,and 0.856,respectively(P<0.05).Conclusion An M-RAP assay for SA,PA,and AB in blood samples utilizing M1 bead enrichment has been developed and can be potentially used for the early detection of bacteremia.
基金financially supported by the Project from the Chinese Academy of Sciences (KSCX2-EW-R-11)the Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences&Yunnan Province (KSCX2-EW-J-23)Science and Technology Department of Yunnan Province (2011C1139)
文摘Animal models are essential for the development of new anti-infectious drugs.Although some bacterial infection models have been established in rodents,small primate models are rare.Here,we report on two bacterial infection models established in tree shrew（Tupaia belangeri chinensis）.A burnt skin infection model was induced by dropping 5×106 CFU of Staphylococcus aureus on the surface of a wound after a third degree burn.This dose of S.aureus caused persistent infection for 7 days and obvious inflammatory response was observed 4 days after inoculation.A Dacron graft infection model,2×106 CFU of Pseudomonas aeruginosa also caused persistent infection for 6 days,with large amounts of pus observed 3 days after inoculation.These models were used to evaluate the efficacy of levofloxacin（LEV） and cefoperazone（CPZ）,which reduced the viable bacteria in skin to 4log10 and 5log10 CFU/100 mg tissue,respectively.The number of bacteria in graft was significantly reduced by 4log10 CFU/mL treatment compared to the untreated group（P0.05）.These results suggest that two bacterial infection models were successfully established in tree shrew using P.aeruginosa and S.aureus.In addition,tree shrew was susceptible to P.aeruginosa and S.aureus,thus making it an ideal bacterial infection animal model for the evaluation of new antimicrobials.
文摘碘伏消毒液由碘与聚醇醚类表面活性剂络合而成,为了解其杀菌效果及其他相关性能,采用悬液定量杀菌试验和理化分析方法进行了实验室观察。结果,以含有效碘250 mg/L该消毒液对金黄色葡萄球、大肠杆菌和绿脓杆菌作用1.5 m in,杀灭对数值均>5.00,对白色念珠菌作用1.5 m in,杀灭对数值>4.00。现场试验结果表明,用含有效碘2500 mg/L该消毒剂对志愿者手和手臂皮肤擦拭消毒3 m in,对自然菌的杀灭对数值均>1.00。将该消毒液原液于37℃恒温保存6个月,有效碘含量下降率为0.99%。结论,洗得宝碘伏消毒液杀菌效果良好,稳定性较好。
