共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
西方城市发展具有较为明显的阶段性,与其历史发展进程相关联,从早期出现,历经古典时代的辉煌,到中古时期的衰落与复兴,地理大发现后的扩张.工业革命后的大规模发展.城市是人类历史的载体,其自身的概念也在历史实际发展中不断丰富,日益复杂化. 相似文献
3.
近年来,被誉为商业楷模的跨国公司的社会责任问题,一直成为舆论关注的焦点。苹果,一个顶着伟大、辉煌等光环的公司,在社会责任履行上存在的缺陷就如同它的商标一只有着缺口的苹果一样醒目。2011年以来,苹果公司代工企业违规使用正己烷、非法使用童工等事件时有发生。在此问题上,苹果不是唯一的公司。肯德基快餐苏丹红’事件、雀巢奶粉碘含量超标、宝洁SK-II被诉含有害成分、天津德普公司行贿等等。在母国遵纪守法,高度重视企业社会责任 相似文献
4.
介绍了中西方兽药广告宣传的各种表现形式,分析了中西方文化差异对兽药广告宣传的影响,提出了我国兽药广告宣传在融合中西方文化的同时,要多学习西方优秀作品的创意,使之相互融合、相互渗透的发展建议,从而推动我国优秀的兽药企业及兽药产品走向世界。 相似文献
5.
6.
7.
2010年是第十一个五年规划的最后一年,也是新的五年规划的编制年,在这样一个特殊的时刻,作为一个教育工作者,对一直以来深深困扰我们的高职院校的教材编写工作进行了一些思考,希望能提出一点有用的意见和建议.也希望在新的五年里,能够切实有效的提高教学质量,更好的为学生服务. 相似文献
8.
9.
《中国蜂业》2014,(Z4)
蜜蜂微孢子虫已被确认为是导致世界性蜜蜂损失的重要病原之一。因商业目的导致不同地区蜂种栖息地扩张与重叠,使两种原寄主分别为东、西方蜜蜂的微孢子虫(东方蜜蜂微孢子虫和西方蜜蜂微孢子虫)得以在不同蜂种间传播。新病原的入侵在对当地蜜蜂资源造成威胁的同时,外来蜂种成为地区性病害传播的媒介。而迁徙性的蜜蜂饲养模式进一步将这种不利影响放大,进而威胁整个养蜂业的持续发展。研究数据显示,东方蜜蜂微孢子虫在人工饲养蜂群中已取代西方蜜蜂微孢子虫成为优势寄种群,但在自然条件下这两种蜜蜂微孢子虫如何作用饲养蜂群的相关数据缺乏。对东、西方蜜蜂混合饲养蜂场和山区东方蜜蜂隔离蜂场的蜜蜂样本进行两种蜜蜂微孢子虫PCR特异性检测,仅检出东方蜜蜂微孢子虫,且西方蜜蜂蜂群微孢子虫感染率高于东方蜜蜂,混合饲养蜂场东方蜜蜂蜂群微孢子虫感染率高于山区东方蜜蜂隔离蜂场感染率。 相似文献
10.
11.
12.
13.
15.
O Tomori 《Research in veterinary science》1979,26(2):160-164
Three strains of Rift Valley fever virus, namely Nigerian (NIG), Smithburn's neurotropic (SNT), and Lunyo variant (LUN) were compared by complement fixation (CF), neutralisation (N), haemagglutination/haemagglutination-inhibition (HA/HI) and agar gel diffusion (AGD) tests. They showed reciprocal cross-reactivity in CF tests. In N tests, using immune sheep sera, there was reciprocal cross-neutralisation between the NIG and SNT strains, but not with the LUN strain, the antiserum of which neutralised both NIG and SNT antigens whereas the reverse was not the case. When hyperimmune mouse ascitic fluid was employed in N tests, there was cross-reactivity between the three strains. Both the NIG and SNT strains yielded haemagglutinins, but not the LUN strain. Furthermore, by the antibody absorption and AGD techniques, the NIG and SNT strains were found to be identical and distinct from the LUN variant strain. The techniques found most useful in distinguishing between the three strains were HA and AGD. Laboratory neuro-adaptation of the classical pantropic virus did not appear to affect its haemagglutination activity. 相似文献
16.
Cornelia Adlhoch Alexander Wolf Helga Meisel Marco Kaiser Heinz Ellerbrok Georg Pauli 《Veterinary microbiology》2009,139(3-4):270-278
Swine Hepatitis E virus (HEV) can be transmitted from pigs to humans causing hepatitis. A high prevalence of HEV in wild boar populations is reported for several European countries, but actual data for Germany are missing. During the hunting season from October to December 2007 liver, bile and blood samples were collected from wild boars in four different German regions. The samples were tested for HEV RNA by quantitative PCR (qPCR) and anti-HEV IgG antibodies by two different ELISAs and a Line immunoassay. A seroprevalence of 29.9% using ELISA and 26.2% in the Line immunoassay was determined. The seroprevalence rate varied greatly within the analyzed regions. However, qPCR analysis revealed a higher prevalence of 68.2% positive animals with regional differences. Surprisingly, also adult wild sows and wild boars were highly HEV positive by qPCR. Compared to liver and serum samples, bile samples showed a higher rate of positive qPCR results. Sequencing and phylogenetic analysis of a 969 nt fragment within ORF 2 revealed that all isolates clustered within genotype 3 but differed in the subtype depending on the hunting spot. Isolates clustered within genotypes 3i, 3h, 3f and 3e. Within one population HEV isolates were closely related, but social groups of animals in close proximity might be infected with different subtypes. Two full-length genomes of subtypes 3i and 3e from two different geographic regions were generated. The wild boar is discussed as one of the main sources of human autochthonous infections in Germany. 相似文献
17.
18.
19.
2006年11月30日,广东省蚕学会在广州丝绸大厦组织了《粤西地区建设国家级“东桑西移”工程项目优质蚕茧生产基地研讨会》。参加研讨会的除了学会的主要领导,养蚕学组的成员,还有我省主要蚕区遂溪、罗定、郁南、阳山、翁源等县、市的代表。与会代表认真学习了商务部下发的关于实施“东桑西移”工程和国 相似文献