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鸭传染性浆膜炎又称鸭疫里氏杆菌病,俗称新鸭病或鸭败血症,原名鸭巴氏杆菌病,是由鸭疫里氏杆菌引起鸭、火鸡和其他禽类的一种急性或慢性传染病。该病的临诊表现特点是,病禽困倦、缩颈,眼与鼻孔有分泌物,排绿色稀粪,到后期出现神经症状如转圈、抽搐。其病理变化主要特点为纤维素性心包炎、肝周炎、气囊炎以及干酪性输卵管炎和脑膜炎。目前,鸭传染性浆膜炎在我国各省养鸭区域均有发 相似文献
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鸭传染性浆膜炎是由鸭疫里默氏杆菌引起的雏鸭一种传染病,主要侵害1-8周龄的小鸭。介绍了鸭传染性浆膜炎发生流行特点,总结了其诊断与防治方法,以期为鸭传染性浆膜炎的防治提供参考。 相似文献
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从信阳市临床疑似鸭传染性浆膜炎发病樱桃谷鸭中分离菌进行形态、培养特征、生化试验和动物试验,鉴定为鸭疫里默氏杆菌。 相似文献
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鸭传染性浆膜炎俗称鸭疫巴氏杆菌病,是由鸭疫里默氏杆菌引起鸭的一种急性或慢性接触性传染病,给养鸭业带来很大损失,直接影响养鸭户的经济效益。现将1例鸭传染性浆膜炎的诊治情况介绍如下: 相似文献
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1992年10月底,泉州市郊两个养鸭户的两批丽佳雏鸭相继于15日龄左右发生一种以萎顿、软脚、眼界有分泌物、下痢和摇头、角弓反张等神经症状为特征的疫病.根据临诊和病理学检查和病原学检验,分离出一株血清Ⅰ型鸭疫巴氏杆菌,确诊为鸭传染性浆膜炎.为国内另一鸭品种发生本病的首次报道. 相似文献
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为研制鸭传染性浆膜炎二价灭活疫苗,以鸭疫里默氏菌血清1型 RAf63株和2型 RAf34株为菌种,培养,灭活,浓缩,混合后制成二价灭活疫苗。2倍量接种6 d 樱桃谷鸭测定疫苗的安全性;接种6 d 樱桃谷鸭,免疫后5、10、14、21、35、49、63、70 d,进行攻菌试验,测定疫苗的免疫原性。结果表明,该疫苗安全,免疫后14 d 产生保护,保护率为90%,免疫持续期可达60 d。研制成功可用于预防由血清1型和2型鸭疫里默氏菌引起的鸭传染性浆膜炎。 相似文献
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ICP-OES法同时测定果蔬中铅、砷、镉、铬、铜、锡含量 总被引:2,自引:0,他引:2
果蔬样品经混酸消化后,控制一定的酸度,定容后应用等离子体发射光谱法(ICP-OES)对果蔬中铅、砷、镉、铬、铜、锡六种有害重金属进行测定,研究了分析测定条件,方法简单快速。测定结果表明,五种元素的加标平均回收率在91.0%~107%之间。其RSD均小于3.5%。按该方法进行处理及测定铅、砷、镉、铬、铜、锡,在选择的测定条件下最低检出限分别为0.0006 mg/kg、0.0003 mg/kg、0.00003 mg/kg、0.00005 mg/kg、0.00003 mg/kg、0.0006 mg/kg。 相似文献
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引:63,自引:0,他引:63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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本试验以菜豆品种先行者为试材,采用32孔、50孔两种规格穴盘,设置10、15、20、25 d等4个苗龄段,通过研究不同穴盘规格和苗龄对菜豆性状及产量的影响,筛选出适合菜豆育苗的穴盘规格和适宜的苗龄。结果表明:穴盘育苗的营养面积增大,菜豆产量随之增加,25 d苗龄条件下,32孔穴盘的前期产量和总产量均显著高于50孔穴盘;随着苗龄的增长,菜豆的前期产量和总产量呈增加趋势,其中25 d苗龄的产量显著高于其他苗龄。综合上述各项指标,菜豆育苗阶段,10 d苗龄可选用32孔、50孔穴盘,15 d以上秧苗选用32孔穴盘为宜。 相似文献
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WILLIAMS TI 《Science (New York, N.Y.)》1960,132(3436):1296-1297
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通过野外调查、标本采集、分类学研究及资料考证,基本摸清了贵州樟科、莲叶桐科、景天科、堇菜科、柳叶菜科、鹿蹄草科、柿科、山矾科、木犀科等9个科药用植物资源的种类与地理分布.结果发现贵州现有樟科药用植物49种4变种,莲叶桐科药用植物5种,景天科药用植物21种,堇菜科药用植物19种1变种,柳叶菜科药用植物20种4变种,鹿蹄草科药用植物7种1变种,柿科药用植物9种1变种,山矾科药用植物12种,木犀科药用植物30种3变种.其中,4种为贵州特有药用植物,40种5变种为贵州药用新资源. 相似文献
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The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites. 相似文献
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The finding of appreciable quantities of p,p'-DDT after feeding o,p'-DDT to rats led to the proposal of a theory, that an isomeric metabolic conversion occurs. The presence of p,p'-DDT as an impurity in supposedly pure samples of o,p'-DDT is the correct explanation for the appearance of p,p'-DDT. Purified o,p'-DDT and (14)C-labeled o,p'-DDT yielded no data to support the idea that o,p'-DDT is converted to the p,p'-DDT isomer. 相似文献
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重金属稀土元素污染在水生物体内的生物富集 总被引:2,自引:0,他引:2
对铅、镉、汞以及镧、铈在鲤鱼体内的生物富集作用进行了室内试验和讨论。结果表明,重金属及稀土元素在鱼体各部位均有较强的富集作用,其中肌肉部分富集能力较弱,内脏富集能力最强;鱼体各部位对重金属及稀土元素的富集作用随时间的增加而增加,在一定的时间后趋于平衡;并且,鱼体中各部位对重金属及稀土元素的生物富集作用存在较大差异。 相似文献