遮阴对10种野生观赏植物生长及生理特性的影响

为了探讨野生观赏植物在遮阴条件下的生态适应性及寻求适度的遮阴比例,选取兰州地区10种野生观赏植物为试验材料,比较测定不同光强生境(全光照、25%、50%、70%遮光率)对10种野生观赏植物生长和生理生化的影响。结果表明,角茴香(Hypecoum erectum)和驴蹄草(Caltha palustris)含水率随着遮阴度的增加而增加,小花草玉梅(Anemone rivularis)在75%遮阴度时干重最大,显著高于其余遮阴处理及全光照(CK)(P0.05);藤本铁线莲(Clematis florida)可溶性糖含量随着遮阴度的增加而减少,鹅绒委陵菜(Potentilla anserina)、角茴香、水杨梅(Geum aleppicum)和驴蹄草的叶绿素含量随着遮阴度的增加而增加;东方草莓(Fragaria orientalis)、角茴香和驴蹄草在全光照下丙二醛的含量显著高于其它处理(P0.05),香青(Anaphalis sinica)和水杨梅在75%遮阴度下丙二醛含量较高。综上所述,香青、莓叶委陵菜(Potentilla chinensis)、藤本铁线莲和野棉花(A.vitifolia)比较适合全光照生长;鹅绒委陵菜、小花草玉梅、东方草莓、角茴香和水杨梅可以忍耐适当的遮阴环境;驴蹄草适合在遮阴条件下生长。     

保持公羊精液卫生无菌的措施

公羊包皮、四肢被毛、母台羊、采精及精液处理环境条件、饲养条件、人员操作、精液稀释液等十大因素可能是造成精液污染的主要因素。因此,必须从上述各方面采取技术措施保持精液卫生无菌。     

绿脓假单胞菌致死海豚的病理变化

1997年～1998年青岛市海豚表演馆饲养的3只海豚小青、小红、小黑分别于1997年9月、1998年2月、5月因绿脓假单胞菌感染而引起发病. 　　……     

火鸡精液液态低温保存

本文研究了3种稀释液在0～5℃下保存火鸡精液的效果及稀释液pH值、稀释比例和卵黄浓度对精子存活力的影响。原精及稀释精液Ⅰ、Ⅱ、Ⅲ不保存时,受精率分别为71.7％,64.03％,63.29％和63.77％(P<0.05);在0～5℃下保存48h后,原精完全丧失受精率(0％),而稀释精液Ⅰ、Ⅱ、Ⅲ的受精率分别为52.40％,45.30％和20.33％(P<0.01)。火鸡精液在0～5℃保存过程中,pH值降低,原精比稀释精液降低程度大。在本研究条件下,pH6.5和1:3稀释最适合于火鸡精子的存活,稀释液中添加5％或10％卵黄可提高火鸡精子的存活力。     

氨基脲人工抗原的合成及其多克隆抗体的制备

目的合成氨基脲人工抗原并制备其多克隆抗体。方法以氨基脲(SEM)和对醛基苯甲酸(CP)为原料合成半抗原(CP-SEM),并采用碳化二亚胺法和混合酸酐法将其分别与牛血清白蛋白(BSA)和鸡卵清蛋白(OVA)偶联,合成氨基脲人工抗原。以氨基脲人工抗原(CPSEM-BSA)为免疫原免疫Balb/c小鼠,利用间接ELISA法测定其抗体效价。结果经薄层层析、红外光谱和元素分析等方法鉴定合成半抗原即为CP-SEM。紫外扫描、聚丙烯酰胺凝胶电泳结果表明人工抗原合成成功。免疫获得抗氨基脲的多克隆抗体,其抗体效价为1:64000。结论氨基脲人工抗原合成成功,并获得抗氨基脲的多克隆抗体。     

初情期前母猪垂体细胞LH和FSH的释放及其对GnRH类似物的反应

利用垂体细胞单层培养模型研究了30，60，90，120和150日龄北京黑猪母猪垂体细胞LH和FSH的释放及其对LRH－A3反应能力。结果表明，猪垂体细胞LH和FSH释放对LRH－A3的反应呈S形剂量依赖型同线。LH基础释放量和LRH－A3刺激的最大释放量在不同日龄间没有显著差异，说明初情期前母猪垂体细胞已达最大LH释放和对GnRH反应的能力。FSH的基础释放量和LRH－A3刺激的最在释放量在30日龄与60日龄之间无差异，但90日龄以后垂体细胞FSH的释施量随日龄增大而降低，提出可能由于垂体在体内时受过抑制素的作用。     

猪传染性胃肠炎诊断与不同治疗方法的疗效观察

本研究针对鱼台县疑似患猪传染性胃肠炎的30～45日龄仔猪,通过临床症状、病理剖检和猪传染性胃肠炎病毒抗体检测ELISA诊断试剂盒确诊为猪传染性胃肠炎。随机抽取四圈57头患猪,按圈分成4组,分别用黄芪多糖-紫锥菊注射液+复方硫酸安普霉素注射液穴位注射、黄藤素注射液+氟苯尼考注射液、黄芪多糖注射液+烟酸诺氟沙星溶液、利巴韦林注射液+硫酸庆大霉素注射液治疗。试验结果表明:黄芪多糖-紫锥菊注射液+复方硫酸安普霉素注射液穴位注射的组方在该地区的治疗效果最好,其次是黄藤素注射液+氟苯尼考注射液的组方、黄芪多糖注射液+烟酸诺氟沙星溶液组方,利巴韦林注射液+硫酸庆大霉素注射液的组方的效果最差。     

Immune responses of orange-spotted grouper,Epinephelus coioides,against virus-like particles of betanodavirus produced in Escherichia coli

Betanodaviruses are the causative agents of viral nervous necrosis (VNN), a serious disease of cultured marine fish worldwide. Virus-like particles (VLPs) are one of the good novel vaccine candidates to control this disease. Until now, betanodavirus vaccine studies mainly focused on the humoral immune response and mortality after virus challenge. However, little is known about the activation of genes responsible for cellular and innate immunity by vaccines. In the present study, VLPs of orange-spotted grouper nervous necrosis virus (OGNNV) were produced in prokaryotes and their ability to enter Asian sea bass cells was the same as native virus, suggesting that they possess a similar structure to OGNNV. VLPs immunogenicity was then determined by intramuscularly vaccinating Epinephelus coioides at different concentrations (1.5 or 15 μg g^?1 fish body weight, FBW) and immunizing frequencies (administration once, twice and thrice). A single vaccination with the dosage of 1.5 μg g^?1 FBW is enough to provoke high titer antibodies (average 3 fold higher than that of negative control) with strong neutralizing antibody titer as early as 1 week post immunization. Furthermore, quantitative PCR analysis revealed that eleven genes associated with humoral, cellular and innate immunities were up-regulated in the liver, spleen and head kidney at 12 h post immunization, correlating with the early antibody response. In conclusion, we demonstrated that VLP vaccination induced humoral immune responses and activated genes associated with cellular and innate immunity against betanodavirus infection in orange-spotted grouper.     

Leucine markedly regulates pancreatic exocrine secretion in goats

Four goats (30.1 ± 1.3 kg) with common bile duct re‐entrant catheter and duodenal catheter were used to evaluate the effects of duodenal leucine infusion on pancreatic exocrine secretion and plasma parameters with two 4 × 4 Latin square design experiments. In the long‐term infusion experiment, goats were fed twice daily [700 g/day, dry matter (DM) basis] at 8:00 and 18:00 hours and were duodenally infused with 0, 3, 6, 9 g/day leucine for 14 days. Pancreatic juice and jugular blood samples were collected over 1‐h intervals for 6 h daily from d 11 to 14 days to encompass a 24‐h day. In the short‐term experiment, goats were infused leucine for 10 h continuously at the same infusion rate with Experiment 1 after feed deprivation for 24 h repeated every 10 days. Pancreatic juice and blood samples were collected at 0, 1, 2, 4, 6, 8 and 10 h of infusion. The results showed that the long‐term leucine infusion did not affect pancreatic juice secretion, protein output, trypsin and lipase secretion and plasma insulin concentration, but linearly increased α‐amylase secretion. No changes in pancreatic protein and lipase secretion were observed in the short‐term infusion. Pancreatic juice and α‐amylase secretion responded quadratically, with the greatest values observed in the 3 and 6 g/day leucine respectively. Trypsin secretion linearly decreased, while plasma insulin concentration increased linearly with increased leucine infusion. The results demonstrated that duodenal leucine infusion dose and time dependently regulated pancreatic enzyme secretion not associated with the change in plasma insulin concentration.