灭幼脲类对玉米螟幼虫的生物活性及防治效果

本文报道灭幼脲类——TH_(6040)对玉米螟幼虫具有很高的生物活性及显著的防治效果。室内测定证明:玉米螟低龄幼虫在含有3ppm浓度TH_(6040)的人工饲料中取食后,存活率降低88～100％。田间试验证明:在春玉米心叶末期施用一次0.045％TH_(6040)颗粒剂,第一代幼虫存活数量降低80％。由此看出,具有改变昆虫生理功能作用的TH_(6040)可应用于玉米螟的综合防治。     

Competence of Aedes albopictus and Culex quinquefasciatus as vector of Dirofilaria immitis after blood meal with different microfilarial density

Aedes albopictus and Culex quinquefasciatus were fed canine blood with different microfilarial density of Dirofilaria immitis ranging from 2500 to 25,000 mff/ml. Larval development in these two mosquito species did not differ significantly. Although C. quinquefasciatus ingested more microfilariae, the number of larvae which developed in A. albopictus was invariably greater than in C. quinquefasciatus. Mortality of the engorged A. albopictus was significantly greater than that of C. quinquefasciatus, and higher microfilarial density raised the mortality in both species. The vector efficiency index of A. albopictus was greater than C. quinquefasciatus at all microfilarial densities, but its survival time was much reduced. Thus, dogs with low microfilarial density are implicated as the main source for the transmission of D. immitis from dogs to mosquitoes.     

Antibacterial effect of chloramphenicol, thiamphenicol and florfenicol against aquatic animal bacteria

The minimum inhibitory concentration (MIC) was measured to evaluate the antibacterial activities of chloramphenicol (CP), thiamphenicol (TP) and florfenicol (FFC) against the aquatic bacterial isolates from soft-shell turtles, fish and shellfish. Amoxicillin (AMPC), oxytetracycline (OTC) and oxolinic acid (OA) were included to compare with above protein synthesis inhibitors. The results showed that the order of MIC range of the isolates from soft-shell turtles for tested drugs was OA>FFC, CP>TP> AMPC, OTC. The percentage of the resistant strains indicated that OA was the lowest (7.14%) and OTC was the highest (85.07%). The order of antibacterial activity against the isolates from fish was OA>FFC>CP>AMPC>OTC>TP. The percentage of the resistant strains revealed that OA (13.64%) and OTC (80.91%) were the lowest and the highest, respectively. For the isolates from shellfish, the order of antimicrobial activity was OA>CP, FFC>AMPC, OTC, TP. TP showed the greatest percentage of the resistant strains (58.7%), but that of OA was the lowest (4.35%). The most common resistant patterns of the isolates from turtles, fish and shellfish were AMPC-OTC, CP-TP-AMPC-OTC, and FFC-CP-TP-AMPC-OTC, respectively. There were partially-complete resistance of the resistant isolates among CP, TP and FFC. The findings indicated that previous treatment might affect the choice of drug to use for aquatic bacterial diseases.     

影响原料奶发酵因素的初探及其控制

通过用保加利亚乳杆菌和嗜热链球菌(1:1)3%的接种量,42.5℃培养,做发酵试验分析,主要存在以下几个因素影响着原料乳的发酵质量:抗生素的残留量、原始酸度和pH值、蛋白含量和总固体含量。通过实验发现脂肪对其影响不大。     

甘露寡糖的研究进展及其在家禽生产中的应用

寡糖作为饲料添加剂是动物营养研究近20年来的热点之一，继抗生素、益生素的研究之后，动物营养学家对寡糖投以极大的关注，其中甘露寡糖是寡糖最重要的组成部分之一。     

让警犬技术强警增效——记全国公安科技工作先进个人

2007年2月27日至28日,全国公安科技大会在北京举行。2月28日,大会对被授予"科技强警示范城市"称号的城市和公安科技"突出贡献奖"、"科技英才奖"、"科技先进集体"的获奖者和单位进行了表彰。中共中央政治局委员、国务委员、公安部部长周永康为受表彰单位和个人颁奖。周永康部长要求,公安机关要把科技强警作为“一把手工程”,加强领导,加大投入,完善公安科技管理机制,推动科技强警的深入开展。要树立人才资源是第一资源的观念,造就一支政治坚定、技术过硬、工作规范、作风严谨的公安科技队伍。广大公安科技工作者要发扬严谨求实、艰苦创业、团结协作、拼搏奉献的精神,学习新知识,掌握新技术,成为科技专家、技术能手。在警犬技术领域,就有这样一些政治坚定、技术过硬的科技专家、技术能手在平凡的警犬技术工作中,做出了不平凡的的贡献。大会的众多科技精英中,来自警犬技术战线的5名科技工作者荣获"全国公安科技工作先进个人"称号。他们分别是公安部警犬技术学校副校长李泰山、公安部南京警犬研究所科研管理科科长刘湖、公安部南昌警犬基地犬病防治所所长徐玉生、公安部昆明警犬基地副主任唐树生、新疆生产建设兵团公安局警犬基地主任张学坤。     

乳源性生长因子对仔猪胃肠道生长发育的影响

猪初乳中含有多种生长因子,包括胰岛素样生长因子、胰岛素和表皮生长因子等。这些乳源性生长因子在促进新生仔猪胃肠道生长发育以及提高损伤黏膜修复等方面起着重要的调节作用。     

浑浊石灰水对柞蚕脓病防治效果试验

柞蚕脓病长期危害我省乃至全国的柞蚕生产,造成较大的经济损失。通过浑浊石灰水对该病的防治试验,为大面积生产防治提供一定的依据和技术储备。     

乳中黄嘌呤氧化还原酶的研究进展

黄嘌呤氧化还原酶属于含钼脱氢酶黄素蛋白家族，是组成乳脂肪球膜的主要蛋白，通过硫酸胺分级沉淀和DEAE-Sepharose柱可从乳脂肪球膜中纯化。XOR作为乳脂肪球膜的膜结合蛋白，在脂肪滴的包裹和分泌中起到重要的结构作用，并且在肠道能够起到一定的抗菌作用。     

不同工艺饲用基质对奶牛生产性能的影响

通过不同生物发酵工艺研究食用菌培养基质开发生态饲料的生产工艺。经对不同工艺食用菌培养基质营养成分和卫生安全主要指标检测及饲养试验筛选，以“活力菌＋糖＋米糠＋水”组合半固体糖化微生物发酵处理工艺效果较明显，发酵时间以7～15d为宜。粗蛋白和粗脂肪分别为14．8％和6．03％，比发酵前增加3．13％和5．12％。粗纤维26．57％，比发酵前降低5．5％。奶牛试验设4个工艺，20％饲用基质试验组与对照组，该工艺组奶料比最高，比对照组高0．56％。