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21.
Conková E Laciaková A Kovác G Seidel H 《Veterinary journal (London, England : 1997)》2003,165(3):214-220
Fusarial toxins are toxic metabolites produced mostly by toxigenic micromycetes of genus Fusarium. Dominant mycotoxins of this group include trichothecenes, moniliformin, zearalenone, and fumonisins. Recently, special attention has been paid to these toxins because of their harmful effects on both animals and humans. On the basis of the available literature, we review here the characteristics of major fusarial mycotoxins with an emphasis on their toxic effects on animals. The most important fusarial mycotoxins, their sources, and their pathology including clinical signs, necropsy findings, as well as changes in haematological, biochemical, and immunological indices, are addressed. 相似文献
22.
基于大涡模拟动态亚格子湍流模型和三维时均N-S方程,应用非结构网格的滑移网格技术,进行了混流式水轮机全流道动静干扰的三维非定常湍流计算。捕捉到了水轮机各过流部件内的流场随时间的变化情况。计算结果表明水轮机中的水流处于复杂的湍流运动状态,随着时间的推移,水轮机内部湍流运动变化剧烈,得到的计算结果更接近实际流场的分布。 相似文献
23.
以具体工程小清河济南城区段为例,研究水库型河道在确定主河槽河岸设计高程应考虑的影响因素。提出对于既有景观功能又有防洪要求的河道,主河槽河岸设计高程应分汛期与非汛期进行考虑,综合防洪要求及景观效果确定所需高程。 相似文献
24.
研究节水农业补偿办法是基于现行的水资源管理及水价政策,仅从这些方面进行政策实施,不可避免地会造成农户的利益损失,从而导致社会福利下降,这与政府公共事业的建设是背而驰的.因此,节水农业补偿一直是节水农业管理的重要内容，它直接影响到节水农业的顺利进行。新疆奎屯河灌区在针对提高水价与采用节水设备如何进行补偿中进行了有益的实践。 相似文献
25.
Chinese scientists started to fully synthesize the Bacillus thuringiensis （B0 CrylA gene in 1991. By the end of 1992, Biotechnology Research Institute of Chinese Academy of Agricultural Sciences （BRI-CAAS） successfully synthesized the full size of GFM CrylA gene, which was a fusion gene of CrylA（b） and CrylA（c）. In 1998, patent of the core technology titled in ＂Genes Encoding Insecticidal Proteins, Construction Of Expression Vectors And Their Application＂ （Patent No. ZL 95 1 19563.8; International Patent Classification No. C12N 15/32） was granted to BRI-CAAS in China. So far, a series of genetic engineering technology have been developed by BRICAAS and successfully received patent protection, including Bt＋CpTI genes （Application No. 98102885.3） for cotton bollworm, GNA gene （Application No. 98120233.0） for aphid, fungal disease-resistant genes （Application No. 99100393.4, 99100394.2） for cotton Fusarium and Verticillium wilt. 相似文献
26.
Sak B Kvác M Petrzelková K Kvetonová D Pomajbíková K Mulama M Kiyang J Modrý D 《Folia parasitologica》2011,58(2):81-86
Abstract: Two hundred and seventeen captive great apes (150 chimpanzees, Pan troglodytes; 14 bonobos, Pan paniscus; 53 western gorillas, Gorilla gorilla) and 20 personnel from thirteen European zoos and two African sanctuaries were sampled and examined in order to determine the occurrence ofEnterocytozoon bieneusi and species of Encephalitozoon in faecal specimens and to compare the epidemiological situation between zoos and sanctuaries. Microsporidia were detected at all sampling sites. Sequence analyses of ITS amplicons generated by using microsporidia-specific primers determined the presence ofmicrosporidia in 87 samples including 13 humans; since two cases of simultaneous occurrence of Encephalitozoon cuniculi and Enterocytozoon bieneusi were identified, 89 full-length ITS sequences were obtained, namely 78 Encephalitozoon cuniculi genotype I, five E. cuniculi genotype II, two E. hellem 1A and four Enterocytozoon bieneusi. No Encephalitozoon intestinalis-positive samples were identified. This is the first report of Encephalitozoon species and Enterocytozoon bieneusi genotypes in captive great apes kept under various conditions and the first record of natural infection with E. hellem in great apes. A comparison of zoos and sanctuaries showed a significantly higher prevalence of microsporidia in sanctuaries (P<0.001), raising a question about the factors affecting the occurrence of microsporidia in epidemiologically and sanitarily comparable types of facilities. 相似文献
27.
依据当前我国农村电网的某些特点，介绍了一种可靠性较高，节能效果显著,技术经济性较好的D/Y变换调容变压器的技术特点及其在农网改造中的应用。并对变压器损耗进行了相关分析及其在相同情况下使用常用的电力变压器的技术指标进行了对照分析，得出在农网改造中，使用这一新型变压器选型方案，不仅可克服当前农村电网的某些不足，还可对以后的增容留有一定的灵活性。 相似文献
28.
Zemanová J Lukác N Massányi P Trandzík J Burócziová M Nad P Capcarová M Stawarz R Skalická M Toman R Koréneková B Jakabová D 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2007,54(6):281-286
In this study, the concentration of nickel in stallion, bull, ram, boar and fox semen, and its relation with spermatozoa quality was analyzed. The concentration of nickel in semen was 0.20 mg kg(-1) in stallion, 0.12 mg kg(-1) in bull, 0.31 mg kg(-1) in ram, 0.06 mg kg(-1) in boar and 0.36 mg kg(-1) in fox. Seminal nickel concentration was significantly higher (P < 0.05) in foxes than that in bulls and significantly higher (P < 0.01) in rams and foxes in comparison with boars. Evaluation of total pathological spermatozoa revealed the highest number in stallions followed by rams, bulls, boars and foxes. In bull, ram and boar semen, separated flagellum, flagellum torso and knob-twisted flagellum were predominant. Knob-twisted flagellum, separated flagellum and flagellum torso were found in increased number in stallion semen and broken flagellum in fox semen. Correlation analysis in bulls indicated a high positive correlation between seminal nickel and separated flagellum (r = 0.76) and medium positive correlation between nickel and flagellum torso (r = 0.62), and in rams a high positive correlation between nickel and separated flagellum (r = 0.77). Medium positive correlation was found between nickel and separated flagellum (r = 0.43) and between nickel and other pathological spermatozoa (r = 0.45) in boars. 相似文献
29.
从地形、气候、作物种类、水源条件四个方面进行分析，对兵团的节水灌溉进行节水灌溉工程分区，将兵团的节水灌溉工程划分为六大区域，为各地、师（局）、团场探求一个相对科学合理的节水灌溉工程形式，并指出节水灌溉发展方向。 相似文献
30.
针对目前国内小型水电站设备陈旧、技术落后、运行安全性差等实际情况，提出了一种集控制、保护、操作、通信于一体的综合自动控制装置方案。这种控制装置结构简洁、高可靠、易维护，有效地提高电站运行效率，确保安全，减少运行维护成本，实现了小水电站“无人值班”和“信息化管理”。该控制装置的问世将改变我国小水电现有运行现状,对提高电厂的经济运行具有特别重要的意义，有利于推动我国农村小水电的自动化水平。 相似文献