上海市禽源阿贡纳沙门氏菌耐药性及脉冲场凝胶电泳分型研究

To investigate the antimicrobial resistance and molecular types of S.agona strains isolated from poultry in Shanghai from 2010 to 2011,K-B method recommended by WHO was used to detect 14 strains of S.agona from poultry.Results were analyzed according to the breakpoints of CLSI,PFGE was used for molecular typing.14 strains were sensitive to 5 kinds of antibiotics.High resistant to sulfisoxazole and high moderate sensitivity to streptomycin.14 strains of S.agona were classified to 6 PFGE patterns.Some S.agona strains isolated from 2010 to 2011 were showed highly homology.Meanwhile,the relativity between antimicrobial susceptibility and PFGE patterns was remarkable.     

雏鸭饲粮锰适宜水平的研究

采用玉米-豆饼型饲粮(含Mn19ppm),对210只1日龄北京雏鸭进行补锰试验,试验分7组,锰添加水平(试剂级MnSO_4·H_2O)按1～7组顺序依次为0,20,45,60,85,110,135ppm,试验期3周,研究雏鸭饲粮锰适宜水平。结果为,饲粮锰水平不影响雏鸭体增重,日采食量和饲料转化率(P>0.05);胫骨锰浓度随饲粮锰水平增加呈线性上升(P<0.01);肝、肾、胰、心组织锰浓度和肝脏含锰的SOD酶活性可与饲粮锰水平拟合为相应的二次曲线模式(P<0.001),上述软组织锰浓度和肝SOD酶活性达到平衡时,所需饲粮锰依次为110.05,100.00,122.91,113.99和116.00ppm。综合试验结果考虑,雏鸭饲粮锰适宜水平为110ppm。     

世纪之交中国家禽业发展的几点思考

１民营、股份制企业逐渐成为中国家禽行业的主力军改革开放２１年来,中国家禽业是我国畜牧业中发展最为迅速、群体生产规模最大、市场经济介入最早、社会贡献最大行业。禽蛋生产连续十几年保持世界第一,禽肉生产也不甘落后,已连续６年以上保持世界第二。据估测,１９９９年禽蛋总量为２２５９．３９万吨,人均禽蛋占有量１７ｋｇ,达到发达国家水平（１７～１８ｋｇ）;禽肉生产总量为１２３０．６万吨,人均禽肉占有量９ｋｇ,已超过世界平均水平（８～９ｋｇ）。中国家禽业缘何在此短短二十年里取得如此骄人的成绩,根本原因之一是改革开放政策和…     

禽蛋自动控温摊床温水孵化新技术及其应用

采用自动控温仪摊床温水孵化蛋４批，其结果是受旧平均孵化率达９１．５６％，其中最高达９２．９９％，平均健雏率达９７．０１％，均已达到 了目前报宾国产优质电孵化器的孵化水平。该方法是对传统化法的改进，但其规模远远超过了传统方法。与电孵化器相比，仅孵化效果相当，而且还具有规模可任意调控、造价低廉、操作方便、节能、雏禽成活率高等优点。     

浅谈早稻生产的几个问题

要夺取早稻生产的持续增产,扩大早稻种植面积,选择适宜品种,选准栽培方式,培育健壮秧苗,建立高产群体是五项关键措施。     

传统顺流干燥与间歇式顺流干燥工艺的对比试验研究

在自行研制的顺流干燥试验台上，利用水稻对传统流干燥工艺与间歇式顺流干燥工艺进行对比试验研究，确定较佳缓苏时间，总结间歇式顺流干燥工艺的特点。     

赤霉素对发育的大豆种子中同化物卸出和积累的影响

用微注射法将不同浓度的赤霉素 (GA3 )引入开花后 30 d的大豆种子幼胚的 2片子叶中间的质外体空间 ,同时给叶片饲喂 14 CO2 ,以种皮和子叶中放射性强度来比较分析 GA3 对同化物卸出的影响。分析了种皮和子叶中的酸性转化酶活性 ,发现 GA3 1× 10 -5mol.L-1使种皮中酸性转化酶活性提高而子叶中酶活性降低 ,从而促进种皮同化物的卸出和向子叶的分配。实验结果还表明 ,引入 GA3 影响了种子内源脱落酸 (ABA)水平 ,而且子叶中的 ABA含量变化和同化物积累相关 ,GA3 1× 10 -5mol.L-1使子叶中 ABA水平上升 ,伴随总糖、蔗糖和蛋白质的积累增加 ,GA3 1× 10 -4 mol.L-1却使 ABA水平下降 ,而且物质积累也减少     

农村10kV配电变压器常见故障分析及防范

农村配电变压器损坏时有发生。为了减少配电变压器故障机率、提高农村电网供电可靠性,就配电变压器常见的故障类型及故障原因进行分析,找出避免和解决配电变压器故障的直观方法,提出必须进行变压器特性试验及综合分析,才能准确可靠地找出故障原因。同时,要重视运行前的测试和运行中的维护,以减少变压器的故障机率。     

危害薤（藠头）的大蒜根螨防治药剂筛选

薤又称藠头,是我国特色蔬菜。近年来随着薤种植面积的扩大，大蒜根螨（RhizoglyphusalliiButetWang）对薤的为害也迅速加重。大蒜根螨群集于薤地下肉质鳞茎处取食为害，受害鳞茎细小，虫量高时鳞茎由外向内腐烂，干燥时外层表皮变褐；地上部表现生长缓慢，叶片细少、发黄，基部叶片逐渐黄枯并向心叶扩展，重发田块常断垄绝收。     

Adsorption of Microcystin LR and LW on Suspended Particulate Matter (SPM) at Different pH

The occurrence of microcystins (MC) during aquatic blooms of cyanobacteria in eutrophicated freshwater body has increasingly become an environmental and health concern worldwide. An experimental study was conducted to investigate the adsorption of two common variants of microcystins, MCLR and MCLW, onto SPM at different pH values. The results showed that most microcystins spiked into an SPM solution with the concentration of 0.25g/l was adsorbed onto solids at pH3 (>95%) and 7 (>85%). At pH13, the proportion of adsorbed microcystin decreased to 8–29% for MCLR and 38–47% for MCLW. The adsorption of MCLR and MCLW onto SPM fitted well with S type of Freundlich isotherm except for pH3 at which L type of Freundlich isotherm was suitable for MCLW. At pH3 and 7, linear isotherm was also able to describe the adsorption of MCLR and MCLW. The adsorption of MCLR and MCLW decreased significantly with the elevated pH, which is consistent with the pH-dependent hydrophobicity.