西藏波密县天麻产业发展问题研究   总被引：1，自引：0，他引：1  

次仁卓嘎  沈娟 《现代农业科学》2009,(5):269-270

由于西藏波密县农业生产具有地质史独特,地形地貌复杂,气候异常,土壤种类繁多,野生植被多样的特点,给天麻生产带来机遇的同时,又带来了严峻的挑战。笔者主要从西藏波密县天麻生产的现状入手,科学地分析了西藏波密县天麻生产中存在的问题,提出了天麻生产发展的对策。  相似文献   

数学方法在饲料配方设计中的应用     

杨耐德  赵娟 《农产品加工．学刊》2007,(9):91-93

在饲料配方中,数学方法占有非常重要的地位。综述了饲料配方设计中应用的几种数学方法:试差法、线形规划、目标规划、模糊规划、灰线形规划和随机规划等方法,从而为建立科学、合理的饲料配方优化系统奠定良好的基础。  相似文献   

大肠杆菌内毒素多克隆抗体的制备与纯化     

李生  吕娟  胡格  索占伟  段慧琴  穆祥 《勤云标准版测试》2007,(11)

为制备大肠杆菌内毒素多克隆抗体,应用大肠杆菌内毒素作为抗原免疫5周龄家兔,辛酸-硫酸铵法和葡聚糖凝胶层析法分离提纯抗血清,十二烷基磺酸钠-聚丙烯酰胺凝胶(SDS-PAGE)电泳方法鉴定多抗纯度,紫外分光光度计测定抗体蛋白含量,ELISA法检测抗血清效价与交叉反应;大肠杆菌内毒素抗体含量和效价分别为6.95mg/ml和1:12800;成功制备出抗大肠杆菌内毒素多克隆抗体,为大肠杆菌内毒素病诊断试剂盒的研制奠定基础。  相似文献   

Systeme d'aquaculture modulaire integre en zone portuaire     

G Barnabé 《Aquaculture (Amsterdam, Netherlands)》1979,16(4):369-374

This system uses the shelter of the harbour entrance and coastal polluted zones for aquaculture purposes. Water from the open sea is supplied by forced circulation to the rearing area, which is separated from harbour water by a plastic sheet. Rafts, enclosures or cages can be used for intensive rearing of mollusks or fish.  相似文献   

城市森林对周边小气候时空格局的影响     

梁娟  蔺银鼎 《勤云标准版测试》2007,(7)

以对城市森林生态效应的动态评价为目的,研究绿地和非绿地之间的物质交换特点与规律,描述和揭示植物群落的生态效应时空格局。试验对森林周边温度和湿度在空间和时间的梯度变化进行测试。结果表明,杨树林对其周边环境有着明显的降温和增湿效应,中午时段绿地生态场效应最高,下午测试时段对周边空气温湿度的影响与常规是逆反的。  相似文献   

Clinical and pathological effects of the dermonecrotic toxin of Bordetella bronchiseptica and Pasteurella multocida in specific-pathogen-free piglets   总被引：1，自引：0，他引：1  

B Eliás  G Boros  M Albert  S Tuboly  P Gergely  L Papp  I Barna Vetró  P Rafai  E Molnár 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(4):677-688

The role of dermonecrotic toxin (DNT) of Bordetella bronchiseptica and Pasteurella multocida, purified by repeated chromatography in Sephacryl S-200 gel, in the pathogenesis of atrophic rhinitis (AR) of swine was studied bacteriologically, clinically and pathologically. Two-week-old specific pathogen-free (SPF) piglets were parenterally treated with 30 micrograms of DNT 3 times at 2-day interval and 7-week-old piglets were treated with 15 micrograms of DNT twice a week for 5 weeks. In 2- to 3-week-old piglets, both B. bronchiseptica DNT and P. multocida DNT produced nasal turbinate lesions with similar severity, characterized by damage of the cilia, epithelial metaplasia, intensive proliferation of osteoblasts, regressive changes, and diffuse osteocytic osteolysis. In 7- to 12-week-old piglets, treatment with B. bronchiseptica DNT failed to produce progressive changes in the nasal turbinates. Histopathological examination revealed osteogenic processes and osteoid synthesis besides the proliferation of osteoblasts and mild osteocytic osteolysis. Moreover, severe gross pathological lesions developed in the stomach, liver, kidneys, and lymphoid organs. The piglets' appetite and body weight gain gradually decreased during the DNT treatment and in the last week when the toxic signs appeared. Treatment of 7- to 12-week-old piglets with P. multocida DNT resulted in progressive AR. Histopathologically, diffuse osteocytic osteolysis was observed in the nasal turbinates. Neither clinical signs nor pathological lesions of the visceral organs developed in these piglets. The authors emphasize that the DNT of B. bronchiseptica basically differs from that of P. multocida in biological properties, though there are certain similarities between the DNTs.  相似文献   

Experimental infection of laying hens with an adenovirus isolated from ducks showing EDS symptoms     

A Bartha  J Mészáros 《Acta veterinaria Hungarica》1985,33(1-2):125-127

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Novel quinoline alkaloid from trunk bark of Galipea officinalis.     

I Jacquemond-Collet  S Hannedouche  I Fourasté  C Moulis 《Fitoterapia》2000,71(5):605-606

The isolation of N-methyl-4-hydroxy-3-(2',3'-epoxyisobutyl)-2-quinolone (1), a new natural compound, and candicine (2) from Galipea officinalis trunk bark is reported. This is the first report of candicine in the genus Galipea.  相似文献   

Serotypes of Pasteurella haemolytica and Pasteurella trehalosi isolated from farm animals in Hungary.     

L Fodor  J Varga  I Hajtós  T Molnár 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1999,46(4):241-247

The biochemical and serological characteristics of 486 P. haemolytica and 31 P. trehalosi strains (517 in total) isolated from different lesions of cattle, sheep, goats, pigs and poultry were examined. A total of 476 P. haemolytica strains (97.9%) showed the characteristics typical of the former biotype A of P. haemolytica, while 10 isolates (2.1%), all from poultry, could not be biotyped. A total of 481 strains (93.0%) could be assigned to one of the 17 serotypes of P. haemolytica-P. trehalosi and 36 strains (7.0%) could not. The majority (83.6%) of the cattle isolates were serotypes A1 and A2. Among strains isolated from sheep all serotypes of P. haemolytica could be identified with the exception of A14, but serotypes A1, A2, A6, A8 and A5 were the most frequent. The overwhelming majority (94%) of the caprine isolates were A2, other serotypes occurred only sporadically. The pig isolates, which could be isolated only very rarely, represented different serotypes, while none of the 10 strains isolated from poultry could be biotyped or serotyped.  相似文献   

会计核算智能化对企业内部控制的影响     

李娟 《计算机与农业》2011,(2):75-76

分析了会计核算智能化的意义和缺陷,及其对企业内部控制的影响,并指出了会计核算智能化的发展趋势。  相似文献