简介：ＳｕｒｖｅｙｏｎｂｉｏｌｏｇｉｃａｌｆｏｕｌｉｎｇａｎｄｃｏｒｒｏｓｉｏｎｏｆｖｅｓｓｅｌｓＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｔｈｅｓｔｅｅｌｓｈｅｌｌｖｅｓｓｅｌｓｃａｍｅｉｎｔｏｂｅｉｎｇ，ｂｉｏｌｏｇｉｃａｌｆｏｕｌｉｎｇａｎｄｃｏｒｒｏｓｉｏ...

简介：PolysaccharideextractedfromEnteromorphaproliferapossessedexcellentbiologicalactivities,butitsmolecularweightwasgreatlyhighwhichinfluencedtheactivity.OrganicSehadhigherbiologicalactivitiesandwassaferthaninorganicSespecies.Inthepresentstudy,Enteromorphapolysaccharidewasdegradedtolowmolecularweightbyfree-radicaldegradationmethodofH2O2andascorbicacid.Bysinglefactorandorthogonalexperiments,theoptimaldegradationconditionswerereactiontimeof2h,reactiontemperatureof50℃,H2O2/ascorbicacid(n/n=1:1)concentrationof15mmolL-1,andsolid-liquidratioof1:50(gmL-1).Then,thedegradedpolysaccharidewaschemicallymodifiedtoobtainitsselenidederivativesbynitricacid-sodiumselenitemethod.Theseleniumcontentwas1137.29μgg?1,whilethecontentofsulfateradicalhadnochange.IRspectraindicatedthattheseleniteestergroupwasformed.Degradedpolysaccharideselenidewascharacterizedandevaluatedforantioxidant,antifungalandantibacterialactivities.TheresultsshowedthatdegradedpolysaccharideselenidehadstrongcapacityofscavengingDPPHand·OHfreeradical.IthadsignificantantibacterialpropertiesforEscherichiacoli,BacillussubtilisandSalmonellaspp.,anditalsohadsignificantantifungalpropertiesforAppleanthrax.Theresultascertaineddegradationandselenylationmodificationdidnotchangethemainstructureofpolysaccharides.Itwaspossiblethatfree-radicaldegradationwasaneffectivewayforenhancingantioxidantactivitytodecreasemolecularweightofpolysaccharides.

简介：57个细菌从水取样从海洋的不同纬度和经度是镇定的南部的海洋(印度部门)被孤立。所有isolates能在4点成长吗？？