简介:在实验课中要遵循实验教学规律,充分发挥教师的主导作用,对学生实际操作给予有计划、有针对性地指导,不做"巡逻兵",不做顺手牵羊式的巡回指导.要重视实验课前的预习,培养学生良好的预习习惯.要将"严格要求"贯穿于实验教学的整个过程,保障实验活动的有序、有质量地进行,同时还要做好实验的总结.通过这样组织、实施实验课的教学,学生就可以在完成学习任务的同时,能力素质得到提高,为学生以后的学习发展奠定一定的能力基础.
简介:TheobjectiveofthisresearchwastoexamineifcertainstrainsofBacillusbacteria,couldsurviveindrypowderproductsandifso,couldthebacteriadegradeorganiccontaminantsinsalinewastewateronaship.Aspartofthestudy,weisolated7domesticatedstrainsnamedNY1,NY2,…,andNY7,thestrainNY6showedtohavethebestperformancefororganicmatterdegradationandcouldsurviveindrypowdermorethan3months.NY6wasidentifiedasBacillusaerius,basedonthemorphologicalandphysic-chemicalproperties.Itsoptimalgrowthconditionswereasfollows:salinitywas2%;temperaturewas37℃;pHwasin6.5-7.0;bestratioofC:N:Pwas100:5:1.ThecapabilityofitsdrypowderforChemicalOxygenDemand(COD)removalwas800mgCOD/ginsynthesizedmarinewastewaterwith2%salinity.Thesporesinthedrypowderwere1.972×108g-1.