简介：

简介：Amutant(GQQ-M6)ofaSponge-Derivedstreptomycessp.GQQ-10obtainedbyUV-inducedmutationwasusedforproducingprodiginines(PGs).Singlefactorexperimentsandorthogonalarraydesign(OAD)methodswereemployedformediumoptimization.Inthesinglefactormethod,theeffectsofsolublestarch,glucose,soybeanflour,yeastextractandsodiumacetateonPGsproductionwereinvestigatedindividually.InthesubsequentOADexperiments,theconcentrationsofthese5keynutritionalcomponentscombinedwithsalinitywerefurtheradjusted.ThemutantstrainGQQ-M6gavea2.2-foldhigherPGsproductionthanthatoftheparentstrain;OADexperimentsofferedaPGsyieldof61mgL-1,whichwas10timeshigherthanthatoftheinitialGQQ-10strainundertheoriginalcultivationmode.

简介：SixactivecompoundsareisolatedfromthemarinebryozoanBugulaneritina,inhabitingtheNanwanBayintheSouthChinaSea,usingthebioassay-guidedmethodwithacombinationofextractionandpartitionationwithsuitablesolventsaswellasmultiplecolumnchromatographies(SephadexLH-20,ODSandpreparativeHPLC).Theirstructuresareidentifiedasknownbryostatins-bryostatins4,5,6,10,11and18throughintensiveanalysisofthedataofhighresolution2DNMR(600MHz,DQF-COSY,TOCSY,HMQCandROESY)andESI-MS.Amongthem,bryostatins10,11and18areforthefirsttimeobtainedfromthisbryozoanintheSouthChinaSeaandtheyshowsignificantantineoplasticactivitiesinvitro.

简介：基于2011年12月和2012年6月洪、枯季大潮北港上段河道水域的现场水文观测资料,以及1999、2002、2003、2004、2005、2006、2007、2010年历史水文测验资料,分析潮流历时、流速、优势流和含沙量等水沙现状和变化特征,并探讨近年来该水域水沙变化的主要影响因素。结果表明：（1）目前北港上段河道水域落潮占主导优势;青草沙水库和长江大桥建成后,落潮优势明显增强,洪季大潮涨、落潮垂线平均含沙量减少,枯季大潮涨、落潮垂线平均含沙量增多;（2）流域径流量的季节性变化是造成北港上段河道水域垂线平均流速洪季大、枯季小的主要原因;大型工程的建设是该水域落潮优势增强的主要影响因素;北港上段河道水域含沙量变化可能与近岸工程建设、入海泥沙量减少等因素有关。

简介：根据2004年5-11月我国鱿钓船在北太甲洋生产数据，结合表温资料，按经纬度1°×1°的格式，利用Marlneexplorer4．0软件作图进行分析。结果表明，5—7月在160°E以东海域作业，产量较低；8—10月在150°-160°E海域作业，为生产作业的产量高峰期，占总产量的62．5％；11月在150°E以西海域作业，产量也较低。在150°E以两海域CPUE最高，150°-160°E中部海域次之，160°E以东海域最低。作业渔场的适宜表温呈现出季节性变化。各月适宜表温分别为：5月12℃～14℃；6月15℃～16℃；7月14。C～16℃；8月18℃～19℃；9月16℃～17℃；10月15℃～16℃；11月12℃～13℃。K-S检验表明，卜述表温可作为寻找中心渔场的指标。

简介：AWRF-Chemmodelincludingacomprehensivegas-phasenitrogenchemistrymodulewasusedtosimulateaseveredusteventappearingintheeasternChinaon19-25March,2002.ThemodelingresultwellreproducedPM10concentrationsinvariousdistancesfromthedustsourcesandthetransportpathwayoftheduststrom.TheresultsshowedthatboththeconcentrationsandthedrydepositionfluxesofPM10increasedovertheChinaseasduringthedusteventfollowingthepassageofacoldfrontsystem.ThemaximumfluxesofPM10intheYellowSeaandtheEastChinaSeaduringthedusteventwere5.5and8.4timesofthosebeforetheevent,respectively.However,thetemporalvariationsofthedrydepositionfluxesofparticulateinorganicnitrogendifferedovertheYellowSeafromthoseovertheEastChinaSea.NitrateandammoniuminthewholenorthernChinarapidlydecreasedbecauseoftheintrusionofdust-loadedairon19March.ThedustplumearrivedintheYellowSeaon20March,decreasingtheparticulateinorganicnitrogeninmassconcentrationaccordingly.TheminimumdrydepositionfluxesofnitrateandammoniumintheYellowSeawereabout3/5and1/6ofthosebeforethedustarrival,respectively.Incontrast,whenthedustplumecrossedovertheYangtzeDeltaarea,itbecameabundantinnitrateandammoniumandincreasedtheconcentrationsanddrydepositionfluxesofparticulateinorganicnitrogenovertheEastChinaSea,wherethemaximumdrydepositionfluxesofnitrateandammoniumincreasedapproximatelyby4.1and2.6timesofthosepriortothedustarrival.