简介：

简介：

简介：Chinesefir(Cunninghamialanceolata)andpoplar(Populusspp.)woodmealwerephenolatedinthepresenceofsulfuricacidusedasacatalyst.Theeffectsofreactiontimeandreactiontemperatureonthewoodliquefactionwereinvestigated.Theresultsshowedthatthereactiontemperaturehadthegreaterinfluenceontheresiduecontentthanreactiontime.Additionally,theliquefactioncurvefortheChinesefirandPoplarweresimilaringeneral.

简介：Endophyticfungiarewidelyfoundinalmostallkindsofplants.Manyendophyticfungicanproducesomephysiologicalactivecompounds,whicharesametooranalogtothoseisolatedfromtheirhosts.Producingphysiologicalactivecompoundsthroughmicrobialfermentationcangiveanewwaytoresolveresourcelimitationandtofindoutalternativesource.Throughthemethodsoforganicsolventextraction,thinlayerchromatography(TLC)andcolumnchromatography,compoundIwasisolated,purifiedfromtheliquidfermentationmetabolitesofthetaxoids-producedendophyticfungi(Alternaria.alternatavar.taxi1011Y.XiangetLUAn-guo)thatwasscreenedfromthebarkofTaxus.cuspidataSieb.etZucc..CompoundIwasidentifiedasonekindoftaxoidstypeIII,basedontheanalyzingresultsbyusingthemethodsofultravioletspectroscopy(UV),infraredspectroscopy(IR),massspectrometry(MS)andnuclearmagneticresonancespectroscopy(NMR).Thisstudyprovidesacompletedmethodforseparationandpurificationoftheendophyticfungiaswellasstructureidentificationofitsfermentationmetabolite

简介：Ｉ－６９杨插穗分别培养在含有不同浓度Ｃｅ（ＮＯ３）３的营养液中，经快速冷冻、冷冻干燥、无水塑料包埋及干刀薄切片法，用Ｘ－射线能谱微区分析测定Ｃｅ及其它无机离子在茎尖分生组织和叶的不同组织中细胞壁、细胞质、细胞核及叶绿体中的含量及分布。在１０ｐｐｍＣｅ（ＮＯ３）３处理下，茎尖中Ｃｅ的含量比对照组和１００ｐｐｍＣｅ（ＮＯ３）３处理组高出近１倍，叶的亚细胞中的Ｋ、Ｐ、Ｓ、Ｆｅ的含量也呈增加的趋势。特别是Ｍｇ的含量增加显著，在保卫细胞的细胞质中Ｍｇ的含量比对照组高出３．５倍，而在表皮细胞的细胞核和液泡中的含量则比对照组高出近１３倍。但在１００ｐｐｍＣｅ（ＮＯ３）３处理下，无机离子在叶中亚细胞微区间的含量则显著下降