从樟巢螟自然死亡的虫尸体内分离得到1株具有较高毒力的致病菌LS-1,对其生防潜能进行评估。经过形态学特征、16S r DNA序列分析,确定该菌株LS-1为粘质沙雷氏菌(Serratia marcescens);以浓度为3.38×10~8cfu/m L的该菌对樟巢螟幼虫...从樟巢螟自然死亡的虫尸体内分离得到1株具有较高毒力的致病菌LS-1,对其生防潜能进行评估。经过形态学特征、16S r DNA序列分析,确定该菌株LS-1为粘质沙雷氏菌(Serratia marcescens);以浓度为3.38×10~8cfu/m L的该菌对樟巢螟幼虫进行室内生物测定:感染第3天和第5天,樟巢螟的死亡率分别为50%和71.67%,校正死亡率分别为47.36%和69.1%;以浓度为3.38×10~8cfu/m L、3.38×10~7cfu/m L、3.38×10~6cfu/m L、3.38×10~5cfu/m L 4个浓度梯度对二化螟幼虫进行室内生物测定,感染第4天,水稻二化螟幼虫的死亡率分别为90.67%、86.67%、84%、82.67%,校正死亡率分别为87.51%、82.17%、78.57%、76.79%。结果说明该菌株对控制螟蛾类害虫具有较好的效果,研究为下一步开发螟蛾类绿色生物杀虫剂提供了研究基础。展开更多
Opioid crisis continues to gain ground in the United States with little regards to color or economic status.More than 800 people die weekly from opioid-related overdosestotally well over 42,000 deaths in 2016,and the ...Opioid crisis continues to gain ground in the United States with little regards to color or economic status.More than 800 people die weekly from opioid-related overdosestotally well over 42,000 deaths in 2016,and the number is rising.Surprisingly,the opioid overdose deaths involved an estimated 40%prescription opioid abuse.As reported by the National Drug Institute(2017),opioid addiction is often described as an“equal opportunity”problem that can afflict people from all races and walks of life.Unlike the crack crises of the past,the present opioid epidemic has extremely impacted White Americans not only the rural and poor,but also suburban and middle class or affluent.Further,current opioid overdoses deaths have increased for Whites,Blacks,and Hispanics,they have increased to a far greater degree for White Americans.Efforts to battle the increasing opioid epidemic have moved from incarceration to using legislation to limit the prescriptions being distributed.State and federal laws are being enacted to placing limitations on opioid prescriptions.展开更多
文摘从樟巢螟自然死亡的虫尸体内分离得到1株具有较高毒力的致病菌LS-1,对其生防潜能进行评估。经过形态学特征、16S r DNA序列分析,确定该菌株LS-1为粘质沙雷氏菌(Serratia marcescens);以浓度为3.38×10~8cfu/m L的该菌对樟巢螟幼虫进行室内生物测定:感染第3天和第5天,樟巢螟的死亡率分别为50%和71.67%,校正死亡率分别为47.36%和69.1%;以浓度为3.38×10~8cfu/m L、3.38×10~7cfu/m L、3.38×10~6cfu/m L、3.38×10~5cfu/m L 4个浓度梯度对二化螟幼虫进行室内生物测定,感染第4天,水稻二化螟幼虫的死亡率分别为90.67%、86.67%、84%、82.67%,校正死亡率分别为87.51%、82.17%、78.57%、76.79%。结果说明该菌株对控制螟蛾类害虫具有较好的效果,研究为下一步开发螟蛾类绿色生物杀虫剂提供了研究基础。
文摘Opioid crisis continues to gain ground in the United States with little regards to color or economic status.More than 800 people die weekly from opioid-related overdosestotally well over 42,000 deaths in 2016,and the number is rising.Surprisingly,the opioid overdose deaths involved an estimated 40%prescription opioid abuse.As reported by the National Drug Institute(2017),opioid addiction is often described as an“equal opportunity”problem that can afflict people from all races and walks of life.Unlike the crack crises of the past,the present opioid epidemic has extremely impacted White Americans not only the rural and poor,but also suburban and middle class or affluent.Further,current opioid overdoses deaths have increased for Whites,Blacks,and Hispanics,they have increased to a far greater degree for White Americans.Efforts to battle the increasing opioid epidemic have moved from incarceration to using legislation to limit the prescriptions being distributed.State and federal laws are being enacted to placing limitations on opioid prescriptions.
