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随着兽医临床医学的迅速发展.血常规检验已成为兽医临床医生最常用的实验室诊断手段之一。血常规检验是指对血液中有形成分如红细胞、白细胞、血小板等指标进行质和量的分析.也是为动物血液病及相关系统疾病的诊断和鉴别提供重要信息的途径之一。血常规分析仪具有重复强、方便、快捷、高效等特点。在兽医临床诊断中血常规检查起着重要作用。但由于血细胞分析影响因素颇多.如动物个体差异、采样送检方法失当、仪器误差等因素均可引起血常规分析结果错误。笔者结合兽医临床血常规检验的实际情况.总结了血常规检测的影响因素并提出了有效使用血常规检查结果的方法。 相似文献
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锅炉由于受到设计、制造、工作环境等因素的影响,其在使用过程中,故障难以避免,为了能够在检查周期到来之前,保证锅炉正常使用,相关部门应该有计划、有组织的对锅炉进行检验,在检验时,要遵循相应的要求,否则会影响检验效果.本文主要通过对锅炉检验必要性分析的分析,对锅炉检验要求进行了研究,希望能够为锅炉检验工作的顺利进展提供帮助. 相似文献
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我们在机械加工过程中经常会出现一定程度的误差,当然,有些误差是不可避免的,但有些却是由于其它的因素导致的,是可以避免的,而这些误差导致加工精度下降,从而影响了工件的质量。因此,我们必须对如何减少误差以及怎样提高工件的加工精度进行系统的研究。本文介绍了机械加工精度的概念和内容,并对机械加工过程中产生误差的原因进行了分析,提出了有效地解决办法。 相似文献
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<正>评价饲料产品质量,首先需要对其成分进行检测,但任何检测都会存在误差,即系统误差和偶然误差。系统误差是由于仪器的某些不完善、测量技术或实验方法不够完善而造成的。此种误差可以通过技术和设备的进步而消除。偶然误差是随机的,产生的原因无法控制,即偶然误差总是存在,只能尽量减少,不能完全消除。通常通过多次测量取平均值可以减小偶然误差。但在多次重复试验中,平 相似文献
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在进行电气测量时,根据误差性质的不同,测量误差一般分为系统误差、偶然误差和疏失误差。测量人员在工作中应正确了解测量仪器的特点以及测量误差产生的原因掌握正确的测量技术和方法,尽量减少误差并剔除误差,这样能确保我们的测量质量。 相似文献
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谭建宁 《青海畜牧兽医杂志》2001,31(6):32-32
由于受设备条件的制约 ,青海省目前乳品加工企业及个体牛奶营销户仍将牛奶的酒精检验 ,作为牛奶检测的主要手段 ,但是由于此检验法自身的缺陷 ,加之奶牛饲喂管理不当及环境等各种应激因素影响 ,造成牛奶酸度在正常值范围而作酒精检验时却呈阳性反应 ,给牛奶生产者造成一定的经济损失 ,鉴于此 ,现就牛奶的酒精检验作一浅谈。由于酒精对乳酪蛋白有脱水作用 ,同时酒精与牛奶混合过程中又产生化合热 ,这种化合热被认为有加强牛奶中酪蛋白的凝固力 ,以此来观察脱水后的酪蛋白对热的稳定性反应。由于这些作用 ,酒精对酸度偏高的牛奶 ,因细菌繁殖而… 相似文献
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Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
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Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
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在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
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近几年,世界饲用添加剂市场增长较快,预计今后将进一步增长,据世界粮农组织(FAO)首领会议的倡议,到2015年,将使世界营养不良的人口削减一半,其间,肉制品将会以每年2%的速度增长,特别是加快猪肉和禽肉增长。这将促进世界添加剂,尤其是蛋氨酸和赖氨酸需求量的增加。 相似文献
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