青饲牧草地化学除草试验报告

对６种青饲牧草用７种除草剂进行除草试验。证明播后苗前墨西哥类玉米用４０％阿特拉津胶悬剂０．９０ｋｇ（ａｉ）／ｈｍ＾２；Ｍ－８１Ｅ饲用高粱与串叶松香草适宜用６０％丁草胺乳油０．９０ｋｇ（ａｉ）／ｈｍ＾２；苏丹草适宜用６０％丁草胺乳油０．９０ｋｇ９ａｉ）／ｈｍ＾２与２５％绿麦隆可湿性粉剂０．９４ｋｇ（ａｉ）／ｈｍ＾２，紫苏用１２％恶草灵乳油０．２７ｋｇ（ａｉ）／ｈｍ＾２与８４％ｃｈｉｎｃｈ乳油１．８９     

Attempts at Preventing Further Spread of Bovine Virus Diarrhoea Virus (BVDV) Infection in 5 Danish Dairy Herds in which BVDV had been Isolated

In 5 herds in which bovine virus diarrhoea virus (BVDV) had been isolated, all animals were bled for virological and serological examination. After the herd blood test, follow up blood tests were made on calves born up to 6 months later in 1 herd, 9 months later in 1 herd and up to 12 months later in 3 herds. Persistently infected animals (PI animals) were removed and after a time period a small herd sample of 10 animals that were born after removal of the PI animals were examined for BVDV antibodies.At the herd blood test a total of 21 PI animals were detected. During the follow up period another 25 PI animals were born.Among animals in the small herd samples collected after removal of the PI animals, antibody positive animals were found in the 2 herds with the shortest follow up period. In the 3 herds with a 1 year follow up period there were no antibody carriers in the herd sample.It seems possible to prevent further spread of infection with BVDV if all animals in the herds as well as animals born during the following year are examined and PI animals removed.     

Feline leukemia virus detection by immunohistochemistry and polymerase chain reaction in formalin-fixed, paraffin-embedded tumor tissue from cats with lymphosarcoma.

The prevalence of feline leukemia virus (FeLV) antigen and DNA was assessed in formalin-fixed, paraffin-embedded tumor tissues from 70 cats with lymphosarcoma (LSA). Tissue sections were tested for FeLV gp70 antigen using avidinbiotin complex (ABC) immunohistochemistry (IHC); DNA was extracted and purified from the same tissue blocks for polymerase chain reaction (PCR) amplification of a 166 base pair region of the FeLV long terminal repeat (LTR). Results were related to antemortem FeLV enzyme-linked immunosorbent assay (ELISA) for serum p27 antigen, anatomic site of LSA, and patient age. Viral DNA was detected by PCR in 80% of cases and viral antigen by IHC in 57% of cases. Seventeen cases were PCR-positive and IHC-negative; one case was PCR-negative and IHC-positive. Clinical records included FeLV ELISA results for 30 of 70 cats. All 19 ELISA-positive cats were positive by PCR and IHC; of the 11 ELISA-negative cats that were negative by IHC, seven were positive by PCR. When evaluated according to anatomic site, FeLV DNA and antigen were detected less frequently in intestinal LSAs than in multicentric and mediastinal tumors. Lymphosarcoma tissues from cats < 7 yr were several fold more likely to be positive for FeLV antigen by IHC than were tumors from cats > or = 7 yr. However, there was no significant difference in PCR detection of FeLV provirus between LSAs from cats < 7 yr and those > or = 7 yr.(ABSTRACT TRUNCATED AT 250 WORDS)     

Influence of Low Light Irradiance on Grain Filling in Rice (Oryza saliva L.) cultivars

Time course of grain filling pattern in two rice (Oryza sativa L.) cultivars, grown under normal and low light intensities, was studied. The number of spikelets, partially filled grains and high density grains were monitored at a 5 day interval during grain filling period from uniform panicles tagged at anthesis. The low light tolerant cultivar Swarnaprabha had more high density grains and less partially filled grains throughout the grain filling period and at harvest compared to cultivar Ratna under both normal and low light intensities. Further, the opening of spikelets in two flushes in Swarnaprabha seemed to result in a more efficient resource allocation and hence better yield as compared to Ratna, in which the opening of spikelets was in a single flush on day 10.     

Teratogenicity testing of BI 58 EC (38% dimethoate) in chicken embryos with special respect to degradation of the active ingredient.

The insecticide formulation BI 58 EC was tested for teratogenicity in chicken embryos, with particular reference to degradation of the active ingredient (dimethoate) after the treatment of embryonated eggs. The pesticide was diluted in water to a concentration level of 0.8%, and the emulsion was injected into the air space in a volume of 0.1 ml/egg, or hen's eggs were treated by the immersion technique. Residues of dimethoate were measured in the samples on days, 13, 15 and 19 of the incubation of chicken embryos, and morphological examinations were performed simultaneously. Analytical chemistry data indicated a slower degradation of dimethoate in embryos after the immersion of eggs, and cyllosis was remarkable in this group among the sporadic developmental anomalies. The liver tissues of both treated groups exhibited severe fatty infiltration.     

蚕沙中黄酮类化合物的提取工艺

采用L9(3^4)正交试验设计对浙江海宁蚕沙中黄酮类化合物的热回流提取工艺进行了优化，所得出最佳工艺条件为；乙醇浓度为30％，料液比1：30，提取时间3h。     

装修与电气

本文着重地论述了由装修而引发的电气安全技术问题已到了不容忽视的程度。就此问题作 者提出了自己的观点及解决办法。     

新引进国外牧草品种比较试验

为了适应我市奶业发展的需要，２０００年我们从国外新引进牧草品种４６个，第一批将９个冬季牧草品种在南平市大横现代农业科技园区引种园进行品种比较试验研究，现将这些品种试种、田间观察、考种测产及生产情况比较材料总结如下：１材料与方法１．１供试品种参试的牧草品种共有９个，即：白三叶（Trifoliumrepens）、紫花苜蓿（Medicagosativa）、多花甜皂角（Aeschynomenesp）、蒺藜草（Aesehynomenesp）、稷（Panicomcoloratum）、多花黑麦草（Loliumsp）、多年生黑麦草（Loliumperenne）、冬油菜（Kozepor）、春小黑麦（Narla）。…     

面对WTO谈成都蚕业的发展出路

面对WTO，蚕业必须深化改革，加快体制改革和技术创新，从调整结构、区域化布局，探索桑地流转机制，扩大生产规模，加强生产基础，扶持龙头企业，扶持产业化，提质上档，提升蚕业内在竞争力，应对“入世”。成都蚕业的发展必须要顺应形势和战略转变，这既是蚕业生产今后的指导思想和发展方向，又是进一步地发展和振兴成都蚕业的战略重点和工作重点。本就成都蚕业发展历程、产业化现状、制约因素、发展方向、对策措施等提出一些粗浅的认识。