海南省库蠓二新种(双翅目:蠓科)(英文)

本文描述在海南省发现的库蠓二新种:尖峰库蠓和开裂库蠓。     

中国食蚜蝇科—新属新种(英文)

本文记述了中国食蚜蝇科Syrphidae、管蚜蝇亚科Eristalinae、管蚜蝇族Eristalini的一新属:艳管蚜蝇属Pseudomeromacrus gen.nov.和新种 刺茎艳管蚜蝇Pseudomeromacrus setipenitus Li,sp.nov.模式标本保存于华南农业大学植保系昆虫标本室。     

三种蚜虫对植物挥发性次生物质触角电位反应的比较研究(英语)

用触角电位法研究了大豆蚜、棉蚜和桃蚜对39种挥发性次生化合物的反应,结果如下:1)绿叶气味化合物及其异构体的去极化电压远强于萜烯类;具有6个碳原子的醇类和醛类是最有活性的化合物.2)大豆蚜和棉蚜对醛类和脂类的反应要比对相应的醇类强,这与桃蚜的实验结果刚好相反.3)蚜虫嗅觉系统所显示的活性与刺激化合物的结构有关,醇类和醛类刺激所引起的EAG饱和的要比不饱和的强.4)大豆春迁蚜对萜烯衍生物(醇、醛、脂)的触角电位反应高于棉蚜,而对萜烃化合物的反应刚好相反.5)各种化合物引起的EAG峰形不同;牛儿醇、癸醇和香茅醇刺激所引起的波形回复最慢,而在直链饱和醇中随着碳原子数的增加而回复速度减慢.     

寡毛实蝇属三新种：（双翅目：实蝇科）

本文记述的3新种,即广西实蝇Dacus(Zeugodacus)guangxianus、近黑颜实蝇D.(Zeugodacus)parater和那大实蝇D.(Asiadacus)nadanus,是1982-1985年在南方各地果园中用诱蝇酮(cue-lure)诱获的,寄主不明。所有模式标本均存放于北京农业部植物检疫实验所。在此谨向提供标本的同志致谢。     

Water Striders:The Biomechanics of Water Locomotion and Functional Morphology of the Hydrophobic Surface(Insecta:Hemiptera-Heteroptera)

Water striders are insects living on the water surface, over which they can move very quickly and rarely get wetted. We measured the force of free walking in water striders, using a hair attached to their backs and a 3D strain gauge. The error was calculated by comparing force and data derived from geometry and was estimated as 13%. Females on average were stronger (1.32 mN) than males (0.87 mN), however, the ratio of force to weight was not significantly different. Compared with other lighter species, Aquarius paludum seems stronger, but the ratio of force to weight is actually lower. A. paludum applies about 0.3 mN·cm-1 to 0.4 mN·cm-1 with its mid-legs, thus avoiding penetrating the surface tension layer while propelling itself rapidly over the water surface.We also investigated the external morphology with SEM. The body is covered by effectively two layers of macro-and micro-hairs, which renders them hydrophobic. The setae are long (40 um-60 um) and stiff, being responsible for waterproofing, and the microtrichia are much smaller (<10 um), slender, and flexible, holding a bubble over the body when submerged.     

An expression profile of human α-lactalbumin in the milk of transgenic mouse

a-lactalbumin(a-Lac),amajorwheyprotein,isacalciummetalloprotein,thathasbeenfoundinallmilksstudiedsofar.ItinteractswithUDP-galactosyl-transferasetoformthelactosesynthetaseandthusmightbeakeyproteinforlactogenesis.Lactosesyn-thetaseispostulatedtobetherate-limitingenzymeforlactosebiosynthesis.Theincreaseda-Lacactivitycanproducesufficientlactosesynthetaseforthesynthesisoflactose,andinmilkyieldbydrawingwaterintomilk,sincelactoseisanosmoreactivemolecule.Transgenicswineoverexpressingbovinea-lactalbu…     

Adenovirus-mediated expression of pig α(1,3) galactosyltransferase reconstructs Gal α(1,3) Gal epitope on the surface of human tumor cells

INTRODUCTIONGal a(1, 3) Gal (gal epitope) is a carbohydrate epitope, which is produced in large amounton the cells of pigs, mice and New World monkey(monkey of South America) by the glycosylationenzyme G alal 1 ) 4G IcNAc3- a- D- galactosyltransferase[or(1, 3)GT; EC2.4.1.511111. This enzyme is active in the Golgi appaxatus of cells and transfers galactose from the sugandonor uridine diphoSphate galactose (UDP-galactose) to the acceptor Nacetyllactosamine residue (Galaal-4GlcNAc-R…     

关于几种避孕植物药的药理初筛及成份预试

本文对云南滇西地区民间用于避孕和绝育秘方中的槌果藤,野花椒寄生、花椒寄生、螃蟹树寄生、鸡矢藤及野花椒的醇提取物进行了小鼠最大耐受量测定及小鼠抗生育实验,结果表明,花椒寄生、螃蟹树寄生的醇提取物具有明显抗生育活性,槌果藤也具有一定的抗生育作用。此外,还对槌果藤、野花椒寄生进行了化学成份预试。     

生精细胞凋亡相关基因

细胞凋亡(apoptosis)是一种基因控制的细胞生理性自杀行为,用以维持细胞数量的相对恒定,可由某种刺激或抑制剂的移除而激活。在哺乳动物精子发生过程中,各级生精细胞都会发生相应的凋亡,通过严格调控以确保成熟精子生成的数量和质量。生精细胞的凋亡是一个许多基因参与的复杂的不可逆过程,其中Bcl-2/Bax基因族、p53基因、Fas-Fasl基因、C-myc基因、CREM基因、HSP基因族、c-Kit/SCF基因、Insl3基因、iNOS基因、BMP8B基因、TR基因和存活蛋白(survivin)基因等发挥了重要作用。研究哺乳动物睾丸生精细胞凋亡相关基因,有利于了解生精细胞凋亡机制,为进一步阐明精子发生的调控机制,预防和治疗精子发生相关疾病提供重要的理论依据。