简介：目的：对粘细菌SorangiumcellulosumSo0157-2的化学成分进行研究。方法：通过色谱层析对提取物进行分离纯化,并通过波谱解析（一维、二维的核磁共振谱和质谱）确定了化合物的结构。结果：分别鉴定为seco-epothiloneA（1）和1-methyl-seco-epothiloneA（2）。结论：化合物1和2都是首次从该菌株中分离得到。其中1是首次分离得到的新天然产物。

简介：NocathiacinI,aglycosylatedthiopeptideantibiotic,displaysexcellentantibacterialactivitiesagainstmultidrugresistantbacterialpathogens.Previously,anovelnocathiacinIformulationforintravenousadministrationhasbeensuccessfullydevelopedanditsaqueoussolubilityisgreatlyenhancedforclinicalapplication.ThepurposeofthepresentstudywastoincreasethefermentationtiterofnocathiacinIandreduceoreliminateanalogousimpuritiesbyscreeningthemediumingredientsusingresponsesurfacemethodology.Afterasysmaticoptimization,awater-solublemediumcontainingquality-controllablecomponentswasdevelopedandvalidated,resultinginanincreaseintheproductionofnocathiacinIfrom150to405.8mg·L-1at150-Lscale.Meanwhile,theanalogousimpuritiesexistedinreportedprocessesweregreatlyreducedoreliminated.Usingoptimizedmediumforfermentation,nocathiacinIwithpharmaceuticallyacceptablequalitywaseasilyobtainedwitharecoveryof67%.Inconclusion,theresultsfromthepresentstudyofferapracticalandefficientfermentationprocessfortheproductionofnocathiacinIasatherapeuticagent.

简介：目的：利用数量化理论方法筛选影响冬凌草Pb含量的关键因子，为冬凌草Pb污染水平预测及调控提供依据。方法：冬凌草Ph质量分数采用等离子发射光谱法测定，生态环境因子为样地调查实测和收集产地环境监测资料相结合，采用数量化方法I拟合曲线分析。结果：经多因子筛选，确定影响冬凌草铅含量（Y）的贡献值最大的关键因子分别为：土壤Pb含量（X1），降水pH值（X6），污染源（X3），公路距离（X4）。结论：建立的冬凌草铅含量预测模型，可为冬凌草药源铅污染程度科学评估和有效防控提供依据。