检索结果-南通市图书馆

Response of bioaerosol cells to photocatalytic inactivation with ZnO and TiO_(2)impregnated onto Perlite and Poraver carriers

引用

Frontiers of Environmental Science & Engineering 2021年第3期15卷 137-149页

作者： Mariana Valdez-Castillo Sonia Arriaga Environmental Science Department Institute for Scientific and Technological Research of San Luis PotosiIPICYT.Camino Presa San Jose 2055Lomas 4a SeccionCP 78216San Luis PotosiMexico

Bioaerosols are airborne microorganisms that cause infectious sickness,respiratory and chronic health issues.They have become a latent threat,particularly in indoor environment.Photocatalysis is a promising process to inactivate completely bioaerosols from air.However,in systems treating a continuous air flow,catalysts can be partially lost in the gaseous effluent.To avoid such phenomenon,supporting materials can be used to fix catalysts.In the present work,four photocatalytic systems using Perlite or Poraver glass beads impregnated with ZnO or TiO_(2)were tested.The inactivation mechanism of bioaerosols and the cytotoxic effect of the catalysts to^bioaeros^ls were studied.The plug flow photocatalytic reactor treated a bioaerosol flow of 460×10^(6)cells/m^(3)_(air)with a residence time of 5.7 s.Flow Cytometry(FC)was used to quantify and characterize bioaerosols in terms of dead,injured and live cells.The most efficient system was ZnO/Perlite with 72%inactivation of bioaerosols,maintaining such inactivation during 7.5 h due to the higher water retention capacity of Perlite(2.8 mL/gpcriite)in comparison with Poraver(1.5 mL/gperiite).However,a global balance showed that Ti0_(2)/Poraver system triggered the highest level of cytotoxicity to bioaerosols retained on the support after 96 h with 95%of dead cells.SEM and FC analyses showed that the mechanism of inactivation with ZnO was based on membrane damage,morphological cell changes and cell lysis;whereas only membrane damage and cell lysis were involved with Ti0_(2).Overall,results highlighted that photocatalytic technologies can completely inactivate bioaerosols in indoor environments.

关键词： Immobilized catalysts Continuous flow Photocatalysis Bioaerosols Cytotoxicity inactivation mechanism

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Multiple action sites of ultrasound on Escherichia coli and Staphylococcus aureus

引用

Food Science and Human Wellness 2018年第1期7卷 102-109页

作者： Xinyu Liao Jiao Li Yuanjie Suo Shiguo Chen Xingqian Ye Donghong Liu Tian Ding Department of Food Science and Nutrition National Engineering Laboratory of Intelligent Food Technology and EquipmentZhejiang UniversityHangzhouZhejiang 310058China Key Laboratory for Agro-Products Postharvest Handling of Ministry of Agriculture Zhejiang Key Laboratory for Agro-Food ProcessingHangzhouZhejiang 310058China Fuli Institute of Food Science Zhejiang UniversityHangzhou 310058China

Ultrasound,is thought to a potential non-thermal sterilization technology in food industry.However,the exact mechanisms underlying microbial inactivation by ultrasound still remain obscure.In this study,the action modes of ultrasound on both Gram-negative and Gram-positive microorganisms were estimated.From colony results,ultrasound acted as an irreversible effect on both Eshcerichia coli and Staphylococcus aureus without sublethal injury.The result in this study also showed that a proportion of bacteria subpopulation suffered from serious damage of intracellular components(e.g.DNA and enzymes)but with intact cell envelopes.We speculated that the inactivated effects of ultrasound on microbes might more than simply completed disruption of cell exteriors.Those microbial cells who had not enter the valid area of ultrasonic cavitation might be injected with free radicals produced by ultrasound and experienced interior injury with intact exterior structure,and others who were in close proximity to the ultrasonic wave field would be immediately and completely disrupted into debris by high power mechanic forces.These findings here try to provide extension for the inactivation mechanisms of ultrasound on microorganisms.

关键词： Ultrasound inactivation mechanism Reactive oxygen species(ROS) Staphylococcus aureus Escherichia coli

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：