烟草普通花叶病与气象条件的关系   总被引：6，自引：0，他引：6  

郑美秀  蒋宗孝 《气象科技》2006,34(6):715-718

分析了气象条件对闽西北烟草普通花叶病(TMV)发生发展的影响。分析得出:温度、湿度、降水及日照等气象因子对TMV发生发展均有明显的影响,但影响程度和关键时段不尽相同,影响最大的是湿度和降水,温度次之,日照最小;TMV始发时温度起主要作用,而流行时起主要作用的是湿度和降水。建立了闽西北地区TMV发生程度的中期预测模式,并提出了防治措施。  相似文献   

骨干网络安全防护技术探讨   总被引：1，自引：2，他引：1  

周琰 《气象科技》2006,34(Z1):65-68

目前网络的开放性和共享性在方便人们使用的同时,也更容易受到攻击,网络安全问题越来越引起人们的关注。文章通过对现有中国气象局骨干网络安全防护系统的简要分析,结合当今主流的网络安全防护理论和相关软硬件技术,阐述了在骨干网络中建立集入侵检测系统、安全漏洞扫描、防火墙系统和防病毒系统于一体的多层次、全方位的网络安全防护体系的必要性,并对骨干网络安全防护系统的改进方向提出了建议。  相似文献   

A study on pathogens of Chinese prawn (Penaeus Chinensis) virus diseases     

Sun Xiu-qin  Zhang Jin-xing 《中国海洋湖沼学报》1995,13(3):284-288

This pathogenic study shows that the viral diseases of Chinese prawns (Penaeus chinensis, O'sbeck) is due to three kinds of viruses: epithelium envelope baculovirus ofPenaeus chinensis (EEBV-PC, detected by the authors in 1993), infections hypodermal and hematopoietic necrosis virus, and hepatopancreatic parvo-like virus, and that the first two viruses seem to be the main pathogens of the epidemic in the northern regions in 1993.  相似文献   

肠道病毒病毒感染的季节和年龄分布特征及其与气象条件的分析     

席林华  刘培宁 《气象科学》2001,21(3):374-378

本文利用苏州市二院和苏州中医院1990-1995年住院病例资料，研究肠道感染，病毒感染的年龄、季节分布特征及其肠道发病住院与气象要素变化的关系，以求探索一定规律、指标供防病保健对策应用。  相似文献   

浅谈计算机病毒的预防工作          下载免费PDF全文

马志强  史如章  秦炜  李志隆  丁耀海 《山西气象》2004,(3):23-24

本文针对目前气象业务工作中常常会遇到计算机被病毒感染的情况，提出了一些预防病毒感染的方法，以减少计算机病毒对业务工作的不利影响。  相似文献   

Microscale gradients of planktonic microbial communities above the sediment surface in a mangrove estuary   总被引：1，自引：1，他引：1  

J.R. Seymour  L. Seuront  J.G. Mitchell 《Estuarine, Coastal and Shelf Science》2007,73(3-4):651-666

The microscale (1 and 4 cm sampling resolution) distributions of chemical (O₂, NH₃, NO₃⁻, NO₂⁻, PO₄³⁻) and biological (Chl a, phytoplankton, bacterioplankton, viruses) parameters were measured in the 16 cm of water immediately overlaying the sediment-water interface (SWI) within a temperate mangrove estuary in South Australia during December 2003 and March 2004. Shear velocities (u_*) during the time of sampling were very low (<0.1 cm s⁻¹), and we consequently predict that resuspension of organisms and materials was negligible. In December 2003, profiles were often characterised by strong gradients in nutrients and organisms, with the highest concentrations often observed within 0.5 cm of the SWI. Microscale patterns in O₂, NH₃, NO₃⁻ and NO₂⁻ indicated that a variety of anaerobic and aerobic transformation processes probably occurred at the SWI and within profiles. Strong gradients in PO₄³⁻ were indicative of nutrient flux across the SWI as a consequence of degradation processes in the sediments. Pico- and nanophytoplankton concentrations were strongly correlated (p < 0.01) to PO₄³⁻, and exhibited 12- and 68-fold changes in abundance, respectively, with highest concentrations observed nearest to the SWI. Several bacterial subpopulations were discriminated using flow cytometry and significant shifts in the ‘cytometric structure’ of the bacterial community were observed within microscale profiles. Two populations of viruses were correlated to the phytoplankton and low DNA (LDNA) bacteria, and each exhibited elevated concentrations within 0.5 cm of the SWI. In March 2004, microscale distributions of O₂ and nutrients were more homogenous than in December 2003, and dissimilar microbial community structure and patterns were observed above the SWI. The patterns observed here support the prediction that benthic processes can strongly influence the ecology of planktonic communities in the overlaying water, and provide further evidence for the existence of microscale variability amongst communities of aquatic microorganisms.  相似文献   

Protective immunity of orange-spotted grouper(Epinephelus coioids) against a nervous necrosis virus isolated from China,and determination of the complete sequences of the virus     

CHEN Xiaoyan  WENG Shaoping  CHEN Shengping  CHEN Zhaoming  HE Jianguo 《海洋学报(英文版)》2007,26(1):101-111

1 IntroductionNervous necrosis virus( NNV) is one of theworldwide pathogens in cultured species and breed-ing from the late 1980s (Bovo et al.,1999; Tan etal., 2001; Breuil et al., 2001; Munday et al.,2002; Lin et al., 2001). The virus is isometric andnon…  相似文献   

应用单克隆抗体检测牙鲆血清中抗淋巴囊肿病毒     

李强战文斌  绳秀珍邢婧 周丽 《中国海洋大学学报(自然科学版)》2007,37(2):243-246

应用杂交瘤单克隆抗体技术制备10株分泌抗牙鲆免疫球蛋白单克隆抗体的杂交瘤细胞。利用单抗2H4，通过间接酶联免疫法（ELISA）对牙鲆血清中抗淋巴囊肿病毒（LCDV）特异性抗体进行了检测。结果表明：无外观症状的牙鲆血清中特异性抗体水平很低（平均OD值为0．092），个别鱼体偏高，证明已感染LCDV，处于潜伏期；患淋巴囊肿病且症状显现的牙鲆血清中特异性抗体水平升高（平均OD值为0．165），患淋巴囊肿病后处于恢复期的牙鲆抗体水平最高（平均OD值为0．231）；健康牙鲆接种LCDV灭活疫苗后，特异性抗体水平显著升高。．  相似文献   

虾池中桡足类及其休眠卵携带对虾白斑综合症病毒的初步调查研究   总被引：2，自引：0，他引：2  

张家松  董双林  董云伟  闫冬春  田相利  刘相义 《中国海洋大学学报(自然科学版)》2007,37(3):405-408,412

探讨对虾白斑综合症(White Spot Syndrome WSS)与虾池中桡足类之间的关系,于2003年5~10月份,在暴发过对虾白斑综合症的池塘中采集桡足类样品共128个,并从冬季底泥样品分离出桡足类休眠卵样品20个,以及此种休眠卵孵化得来的桡足类幼体样品5个。利用PCR斑点杂交法以及巢式PCR法检测样品中对虾白斑综合症病毒(White Spot Syndrome Virus WSSV)携带情况。结果表明,5~10月份桡足类样品中均能检测到阳性样品,总的阳性率为56.3%;其中,5月份样品阳性率为37.5%,6,8,9,10月份各取样1次,每次样品中的阳性率均在60%以上。在20例桡足类休眠卵样品中有1例为阳性,阳性率为5%;并且实验室中孵化此种休眠卵得来的桡足类幼体样品中检测到阳性,阳性率为40%。本研究初步表明,桡足类是WSSV的携带者或传播媒介之一,且冬季池塘底泥中携带WSSV的桡足类休眠卵可萌发出带病毒的桡足类。  相似文献   

辽东湾沿岸海水及贝类中甲肝病毒分布的研究          下载免费PDF全文

樊景凤  宋立超  张喜昌  梁玉波  关道明 《海洋科学》2007,31(2):52-54

用RT-PCR方法检测辽东湾几个重点沿岸海域表层海水和几种经济贝类样品中甲肝病毒的分布。结果表明,6个重点沿岸海域表层海水中均检出甲肝病毒(Hepatitis A virus,HAV),6种经济贝类样品中有4个样品检出甲肝病毒。检测结果显示,辽东湾某些重点沿岸海域受陆源生活污水影响严重,有关部门应加强海洋环境和海产贝类卫生安全监测和管理,以避免引发甲型肝炎暴发流行。  相似文献