C-glycosyl flavones from Peperomia blanda     

Leosvaldo S.M. Velozo  Marcelo J.P. Ferreira  Maria Isabel S. Santos  Davyson L. Moreira  Elsie F. Guimarães  Vicente P. Emerenciano  Maria Auxiliadora C. Kaplan 《Fitoterapia》2009

The methanol extract from aerial parts of the Peperomia blanda (Piperaceae) yielded two C-glycosyl-flavones. Their structures were elucidated on the basis of extensive spectroscopic analysis, including 1D and 2D NMR, chemical transformation and comparison with the related known compounds. The structure of the new flavonoids were established as 4′-methoxy-vitexin 7-O-β-d-xylopyranoside (1) (7-O-β-d-xylopyranosyl-8-C-β-d-glucopyranosyl-4′-methoxy-apigenin) and vicenin-2 (2). The antioxidant activity of both compounds was investigated using the DPPH assay. Both compounds showed only modest activity, with IC50 values of 357.2 µM for 1, and 90.5 µM for 2.  相似文献   

中红侧沟茧蜂逐日产卵规律及子代性分配   总被引：1，自引：0，他引：1  

浑之英  路子云  耿亚玲  潘文亮 《中国生物防治》2005,21(4):218-221

研究了中红侧沟茧蜂在一定的人工繁殖条件下,雌蜂的逐日产卵规律及子代逐日性分配规律。结果表明,成虫羽化后无论交配与否当天均可产卵。如果不进行交配,则进行孤雌产雄生殖。在22±1.5℃、湿度40%~60%、光照强度4700~5100lx条件下,雌蜂寿命平均8.3d,产卵持续时间平均为7d,最长可连续产卵15d。单雌产卵量平均84.4粒,最高可达231粒。中红侧沟茧蜂单雌日产卵量与雌蜂日龄有密切的关系,1~12日龄7.8~17.4粒;13~15日龄1.3~5.0粒;15d时,雌蜂死亡率达90%,存活雌蜂不再产卵。在整个产卵期,中红侧沟茧蜂子代逐日性分配呈现雌性比例逐渐降低的趋势。雌雄比在第1~3d,处于1.36~1.59∶1之间;第4~8d在0.79~1.12∶1之间;9d以后下降为0~0.60∶1。  相似文献   

Analysis and Discussion on Settlement of Disputes under Some Civil Engineering Contract Conditions     

DING Da yong 《保鲜与加工》2002,(1):55-58

Firstly the incapability of supervising engineers in dealing with disputes is discussed. This paper analyzes the similarities and differences between the methods of disputes settlement under the provisions of the new edition of FIDIC Conditions and the two main domestic civil engineering contract conditions.It is argued that the DAB proposed by the new edition of FIDIC Conditions and the dispute mediator suggested by the Irrigation Works, Water and Electrical Works and Civil Engineering Construction Contract are reasonable and necessary.  相似文献   

自带介质血红密孔菌NFZH-1的鉴定及其木质素降解特性     

冯年捷  翟华敏  王传槐 《林产化学与工业》2014,(5)

菌株自带介质可提高其漆酶降解木质素能力,因此自带介质高产漆酶菌株的筛选、鉴定对漆酶的商业应用将起到促进作用。从南京山林地区分离出两株血红密孔菌NFZH-1和NFZH-2,并以杂色云芝为对照,研究了两株血红密孔菌发酵产漆酶和木质素降解特性。首先通过形态学特性鉴定了NFZH-1为自带介质血红密孔菌。其次以愈创木酚为反应底物,平板接种菌株,培养5天,NFZH-1颜色圈较菌丝圈大,且颜色最深;经10天固态发酵,NFZH-1所产漆酶酶活高达23600 U/g,且未检测出木质素过氧化物酶( LiP)和锰过氧化物酶( MnP)。平板显色和固态发酵产酶结果表明自带介质血红密孔菌NFZH-1为漆酶高产菌株。麦草粉经菌株 NFZH-130天降解,木质素降解率、综纤维素降解率分别达56.7%和36.6%,表明血红密孔菌NFZH-1为选择性高木质素降解活性菌株。  相似文献