应用核型多角体病毒载体在家蚕和家蚕培养细胞中高效表达人尿激酶原cDNA基因

将人尿激酶原(pro-UK)cDNA分别插入家蚕核型多角体病毒转移载体pBK283和pBF4中,构建成两个重组质粒。所构建的这两个重组质粒与野生型家蚕核型多角体病毒DNA(BmNPV genomic DNA)共转染家蚕培养细胞,经病毒斑实验(Plaque assay)筛选出含pro-UK cDNA的稳定重组病毒株BmNPV-pk1和BmNPV-pk2。将此两株重组病毒分别感染家蚕培养细胞和家蚕幼虫4天后,用酶联免疫测定法(ELISA),纤维蛋白平板溶圈测活法和Western印迹法分析细胞培养上清及细胞和家蚕的体液及组织,证实均有pro-UK表达。家蚕培养细胞的表达量分别为0.0012mg/mL(上清液和10~6细胞)和0.0031mg/mL(上清液和10~6细胞),家蚕幼虫体液的表达量分别为0.0100mg/mL和0.0300mg/mL。从以上结果可看出,家蚕幼虫体液的表达量是培养细胞的10倍,以上表达产物在纤维蛋白平板上测活均有溶纤活性。     

蚕沙替代精料对黑山羊瘤胃细菌数量及多样性的影响

旨在研究蚕沙替代精料对黑山羊瘤胃细菌多样性及瘤胃产甲烷杆菌、产琥珀酸杆菌和黄色瘤胃球菌数量的影响.试验选用35只体重相近(20±1.3 kg)且健康的3月龄乐至黑山羊阉公羊,随机分为5个处理组,每组7只山羊,单栏单饲,对照组饲喂基础精料,试验组(Ⅰ、Ⅱ、Ⅲ和Ⅳ组)分别以25%、50%、75%、100%蚕沙替代基础精料,粗料各组相同,预试期20 d,试验期90 d.试验结束时每个处理组选择4头接近组内平均体重的羔羊屠宰取瘤胃液用于检测瘤胃微生物;采用Real Time-PCR法检测产甲烷杆菌、产琥珀酸杆菌和黄色瘤胃球菌的数量,采用PCR/DGGE法检测瘤胃细菌的多样性.结果表明:(1)蚕沙替代不同水平精料影响瘤胃产甲烷杆菌、产琥珀酸杆菌和黄色瘤胃球菌数量,其中随着蚕沙替代水平增加,产甲烷杆菌有减少趋势,而产琥珀酸杆菌有先减少后增加趋势,黄色瘤胃球菌先增加,而后降低再增加;(2)蚕沙替代不同水平精料影响瘤胃细菌多样性,其中随着蚕沙替代水平增加,瘤胃细菌多样性有减少趋势,若继续增加,几乎无变化.综上,蚕沙替代精料影响黑山羊瘤胃细菌数量和多样性,其中产甲烷杆菌、产琥珀酸杆菌和黄色瘤胃球菌数量变化趋势不尽相同,而细菌多样性有减少趋势.     

Characterization of 17β-estradiol 3-(β-D-glucopyranoside) and 17-(α-D-glucopyranoside) as the metabolites of 17β-estradiol in the cultured ovaries of the silkworm,Bombyx mori

Summary The structures of the metabolites formed upon incubation of 17-estradiol with the ovaries of silkworm,Bombyx mori, have been determined as 17-estradiol 3-(-D-glucopyranoside) (1) and 17-(-D-glucopyranoside) (2) by spectroscopic means.     

浅谈葡萄糖添食对家蚕的作用

葡萄糖是蚕生长主要的供给能量的物质,为蚕合成更多的丝蛋白打下基础。作者通过葡萄糖的添食实验,得出添食葡萄糖对蚕的食下量、全茧量、茧层量有显著提高。同时,添食不同浓度的葡萄糖溶液,调查蚕的食下量、全茧量、茧层量影响程度,得出添食5%葡萄糖溶液对蚕的作用效果明显。     

从蚕沙中提取果胶的研究

以蚕沙为原料,对提取果胶的方法进行研究。通过对酸度(PH)、萃取时间(t)、温度(T)、物料／水等影响因素的探讨,得出了提取果胶的最佳工艺条件。     

Morphology of immature stages of Bittacus choui (Mecoptera: Bittacidae) with notes on its biology

The hangingfly Bittacus choui Hua et Tan, 2007 Hua, B. Z. and Tan, J. L. 2007. A new species of Bittacus Latreille (Mecoptera,Bittacidae) from Daba Mountain in China.. Acta Zootaxon Sin., 32: 455–458.  [Google Scholar] is unique in Bittacidae for having only three instead of four larval instars. Its morphology was studied and illustrated in detail for developmental stages, including egg, larva and pupa. Ultrastructure of eggs, larval head, spiracles and prolegs are provided. The egg is spherical. A single micropyle was observed. The larva is eruciform with a pair of prominent compound eyes and a mid ocellus; the eight pairs of prolegs are unequal in length. Nine pairs of spiracles are located on the prothorax and the first eight abdominal segments respectively; the first instar larva differs from other instars in spiracle number. The somites are unusual, with rows of protuberances bearing distinct setiferous clavate setae. The anal segment terminates in a protrusile sucker. Pupae are exarate and decticous, taking the shape of the adults. The species completes one generation per year, overwintering as a mature larva. Adults emerge in the field from mid‐July to late August.     

Homichloda barkeri (Jacoby) (Coleoptera: Chrysomelidae: Alticinae), a candidate agent for the biocontrol of prickly acacia,Acacia nilotica (Mimosaceae) in Australia

The status of Homichloda barkeri (Jacoby) n. comb. is discussed. A key is presented to four Afrotropical Homichloda species, including fulva n. sp. The eggs, larvae and pupae of H. barkeri are described for the first time. Unusual adult and immature stage characters are discussed in relation to the placement of Homichloda in the Alticinae.     

毒隐翅虫研究进展 1名称,分类与生物学

本文论及毒隐翅虫的学名、俗名、分类与生物学。该属棣于毒隐翅虫亚科的毒隐翅虫族。     

蚕沙在育成鸡配合饲料中饲喂效果观察(初试)

将育成鸡(四月龄)公80只母16只均分为4组,按其营养需要设一基础日粮。分别用4％,8％,12％的蚕沙替代基础日粮中的麦麸,经一个月的饲喂试验,与对照组比较,以4％蚕沙组增重效果差异显著(P<0.05)。试验结果表明,用适量蚕沙替代麦麸饲喂育成鸡,适口性好,无任何不良表现,对育成鸡生长还有明显增重效果。     

西昌蚕茧基地建设的优势、机遇及措施

西昌位于四川省西南部安宁河中段,拥有蚕茧生产得天独厚的气候及市场优势;西部大开发及加入WTO为蚕茧基地建设带来了良好的发展机遇,搞好规划,完善养蚕设施,抓好技术培训是基地建设的根本措施。