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causal virus
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  “causal virus”译为未确定词的双语例句
     A NOTE ON THE TARO MOSAIC AND ITS CAUSAL VIRUS OCCURRING IN GUANGZHOU
     广州芋花叶病及其病原病毒的初步研究简报
短句来源
     Results of electron microscope observe proved that the shape and size of causal virus found from infection leaf was similar with DMV. A preliminary conclusion is that taro of the two varieties were infected by DMV.
     进一步的电镜观察结果表明:两个品种的感病叶片上都发现了与DMV形状、大小相似的病毒粒子,初步认为在这两个品种上普遍发生芋花叶病毒病。
短句来源
     The writers are of the opinion that the causal virus enitity of the rosettedisease of wheat in North China is one of the regional strains of the northerncereal mosaic virus,however,the MRDV-might frequently be present in thediseased plants in fields.
     小麦丛矮病毒很可能是北方禾谷花叶病毒的一种地方性株系。
短句来源
     Since the symptom expressions of Guangdoug garlic mosaic disease and Canada garlic mosaic disease are similar and the size of the causal virus in Canada is similar to the size of 12×500-700nm virus particle existing in Guangdong garlic, we consider that these two causal viruses are identical, and belong to the garlic mosaic virus(GMV) of the potyvirus group.
     金山火蒜病毒中长度为500—700nm的粒体与加拿大大蒜花叶病毒粒体大小相同,其交互血清反应均为阳性,表明它们属同一种病毒,同为马铃薯Y组的大蒜花叶病毒(GMV)。 其他两种病毒的归属有待进一步研究解决。
短句来源
  相似匹配句对
     On Jewish Virus
     计算机病毒“犹太人”
短句来源
     A NOTE ON THE TARO MOSAIC AND ITS CAUSAL VIRUS OCCURRING IN GUANGZHOU
     广州芋花叶病及其病原病毒的初步研究简报
短句来源
     Virus counter
     病毒计数器
短句来源
     Studies on the Causal Factors and Control of Maize Rough Dwarf Virus
     玉米粗缩病发病因素及防治研究
短句来源
     Causal Relation Analysis
     效应关联分析
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  causal virus
Biological, morphological and serological properties of grapevine berry inner necrosis virus (GINV), the causal virus of grapevine berry inner necrosis disease occurring in Japan, were compared with those of several known trichoviruses.
      
The causal virus was isolated on the chorioallantoic membrane (CAM) of developing chicken embryos where it induced large yellowish-white pock lesions, 3-4 mm in diameter, by the fifth or sixth day post-inoculation.
      
Taken together, these findings indicate that it is very likely that the replicative ability of the causal virus was as vigorous as that of HBV in hepatitis B e antigen-positive asymptomatic carriers with markedly high viral titers.
      
We consider the causal virus under study a strain of potato-virus Y, possibly related to the necotic strains.
      
The present study showed that the causal virus of fowl glioma had good ability to integrate and replicate in the myocardium.
      
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Isolations and routine diagnosis of the causal virus of a mosaic disease of adzuki-bean,which was usually very common and severe in Peking,were made during 1962 and 1963.Thesymptoms produced on the adzuki-bean plants after being inoculated with the virus isolatewere the same as those observed in fields,namely chlorotic blotches or mild mottling of the firstleaves and mosaics,slight puckering,rolling,convex cupping and marginal identation of thelater developed leaves.The infected plants usually became...

Isolations and routine diagnosis of the causal virus of a mosaic disease of adzuki-bean,which was usually very common and severe in Peking,were made during 1962 and 1963.Thesymptoms produced on the adzuki-bean plants after being inoculated with the virus isolatewere the same as those observed in fields,namely chlorotic blotches or mild mottling of the firstleaves and mosaics,slight puckering,rolling,convex cupping and marginal identation of thelater developed leaves.The infected plants usually became stunted and developed numerous budsin rosttes at each node.This virus isolate was demonstrated to live in vitro (ca.20℃ to 22℃) for 24 hours,toressist a thermal inactivation up to 60-65℃ for ten minutes and to endure a dilution up to1:3,000 to 1:4,000.Transmission of this virus through adzuki-bean and cowpea seeds was demonstrated andthe percentages of transmission were 1.6% and 17.2% respectively.Myzus persicae Sulz.,Rhopalosiphum pseudobrassicae Davis,Aphis gossypii Glover andMacrosiphum pisi Kalt.were able to transmit the virus in greenhouse tests and their efficienciesof transmission followed the order mentioned above.Some species of leguminosae,including Vigna sinensis (1.) Endl.,V.cylindrica (L.)Skeels.Phaseolus vulgaris L.var.,Pisum sativum L.,Dolichos lablab,L.,Vicia fabaL.,Glycine soja Sieb.et Zucc.were readily infected and did not show any necroticensiformis Dc.was very difficult,if not impossible,to infect and did not show any necroticspots.Other legumes tested,including Phaseolus mungo L.,Cassia mimosoides L.,Lupinusperennis L.,Lathyrus palustris L.,Astragalus sinicus L.,Trifolium repens L.and T.hybridumL.were found to be immune.Some members of Solanaceae,Cucurbitaceae,Amaranthaceae,Compositae,Cruciferae,Umbelliferae and Chenopodiaceae were inoculated,however,none ofthem was infected except Spinacea oleracea Mill.,Matthiola sp.and Cheiranthus cherii.Onleaves of the last named plant minute chlorotic spots were produced,but not very consistent.The writers were of the opinion that the so-called cowpea mosaic viruses so far reportedmight be assembled into two main groups:one with short longevity in vitro of usually notexceeding 72 hours and the other with rather long longevity of 15 to 20 days.To the formerbelonged the virus isolates of Mclean (1941),Yu (1946),Snyder (1942) and Hino (1960),whileto the latter belonged the isolates of Dale (1949),Capoor & Varma (1956),Semangoen (1958),Chant (1962) and Robert & Robert (1962).The former group was considered to be AsparagusBean Mosaic Virus (AbMV) and the latter retained the name Cowpea Mosaic virus (CpMV).The present isolate evidently agreed mainly with the AbMV although having some minordiscrepancies and therefore it was considered to be a distinct strain of the Asparagus BeanMosaic Virus.

赤豆花叶病在北京相当严重,病株达10—40%。病株分离物用常规汁液摩接法接于赤豆幼苗,初生透明褪绿小点或轻微斑驳,后表现花叶及疱斑,重者叶扭折畸形,叶缘缺刻,株矮,(?)小而少。同一病毒接种于豇豆(Vigna sinensis L.)上,与赤豆上的症状无明显的差别。这个病毒的物理属性为:致死温度60—65℃10分钟,稀释限点1∶3000—1∶4000,体外存活仅24小时。病株所结种子有传毒能力,视寄主不同而有所差异,赤豆种子发病率仅1.6%,而豇豆种子发病率为17.2%。桃蚜、豆蚜、棉蚜及菜缢管蚜皆能传播此病毒。寄主范围为多种豆科作物,如豇豆、藊豆、大豆、蚕豆及芸豆、豌豆,黎科的菠菜,十字花科的桂竹香、紫罗栏等。除在桂竹香上生褪绿小点外,余均表现系统花叶症。但不侵染紫云英、绿豆、山扁豆、三叶草、苜蓿、黄瓜、南瓜、烟草、藜、千日红、苋及芹菜等。据此,作者等认为它不是黄瓜花叶病毒的株系,亦不同于日野的赤豆花叶病毒(豇豆花叶病毒的一个株系),与典型的长豇豆花叶病毒有较多的共同点,因此认为是长豇豆花叶病毒(AbMV)种羣中的一个新株系。

In North China a rosette disease of wheat had been revealed to be causedby the northern cereal mosaic virus(NCMV).However,from wheatplants wi-th rosette symptoms collected from fields a virus entity similar to the maizerough dwarf virus(MRDV)was frequently isolated in addition to the northerncereal mosaic virus.Both viruses were transmitted by the planthopper Ladel-phax strietellus.The wheat plants infected-by the northern cereal mosaic virusalone showed chlorotic stripes and streaks on leaves,abnormal abundance...

In North China a rosette disease of wheat had been revealed to be causedby the northern cereal mosaic virus(NCMV).However,from wheatplants wi-th rosette symptoms collected from fields a virus entity similar to the maizerough dwarf virus(MRDV)was frequently isolated in addition to the northerncereal mosaic virus.Both viruses were transmitted by the planthopper Ladel-phax strietellus.The wheat plants infected-by the northern cereal mosaic virusalone showed chlorotic stripes and streaks on leaves,abnormal abundance of til-lering and various degrees of dwarfing.The wheat plants infected by the MR-DV alone showed dwarfing of the plants,darkening of the green leaves(blucdwarf)and stiffness of the leaf blades.Furthermore the number of tillers mi-ght be reduced and heading was poor.Inoculation tests demonstrated that NC-MV did not attack maize.In the mixed-infections of the two virusse in whe-at plants,the symptoms were either of the NCMV type or of the MRVD ty-pe according to the predominance of one of the two viruses in the plants.Ge-nerally the symptoms of NCMV might mask the MRDV symptoms.Electronmicroscopic studies of the ultrathin sections of the NCMV infected wheat leavesrevealed bullet-shaped particles measured 40—70×270—400 nm,This measure-ment is littl(?)different from that of Japanese author.No MRDV particles werefound in the above studied ultrathin sectionsof typical rosette deiseased wheatleaves.The writers are of the opinion that the causal virus enitity of the rosettedisease of wheat in North China is one of the regional strains of the northerncereal mosaic virus,however,the MRDV-might frequently be present in thediseased plants in fields.

在田间的小麦丛矮病非典型病株申常常分离到北方禾谷花叶病毒(NCMV)及玉米粗缩病毒(MRDV)两种病原物。单独用前者接种,仅表现小麦丛矮症,单独用后者接种,仅表现小麦蓝矮症,即植株矮化、暗绿、分蘖减少,叶坚挺。两者混合侵染时,往往表现两者的混合症状,但以何种病毒占优势而倾向于优势病毒的症状。典型丛矮症植株中电镜检出弹状病毒粒体,40—70×270—400nm尺度与日本报导的稍异。典型丛矮病株中不存在玉米粗缩病毒的粒体。小麦丛矮病毒很可能是北方禾谷花叶病毒的一种地方性株系。

The mosaic-type degeneration of potato has been very widely spread and serious in Guangdong province. By keeping on roguing the diseased plants in the seed-patato fields every year, however, the incidence of the disease has been kept under 10-5% for more than 30 years in some localities. The yield was 2500 catties/mou , and up to more than 5,000 catties/mou in some cases.An investigation was made in 1962-1965. According to the results of the studies on indicator plants, host ranges, modes of transmission, physical...

The mosaic-type degeneration of potato has been very widely spread and serious in Guangdong province. By keeping on roguing the diseased plants in the seed-patato fields every year, however, the incidence of the disease has been kept under 10-5% for more than 30 years in some localities. The yield was 2500 catties/mou , and up to more than 5,000 catties/mou in some cases.An investigation was made in 1962-1965. According to the results of the studies on indicator plants, host ranges, modes of transmission, physical properties and serological reactions (only on potato virus X), it was found that the most important causal viruses were potato virus X and potato virus Y.A total of 940 potato plants belonging to 23 varieties grown in different localities of the province were tested with indicator plants.The results showed that nearly all diseased plants contained potato viruses "X + Y" or potato virus Y alone,while most of the healthy looking plants contained only virus X or none at all . Among the 23 varieties , 7 varieties that seemed to be immune to the disease contained neither virus X nor virus Y. The soil temperature during the growing season in the potato producing area was found to be optimum for the growing of potato. The insect vectors, cotton aphid and peach aphid, were found to be quite common in the fields.It was thus concluded that most patato varieties grown in the province were rather resistant to virus X but rather susceptible to virus Y, that the incidence and prevalence of the disease in each crop were mainly the results of new infections of virus Y transmitted by the aphid vector in the growing season, and that roguing of the diseased plants, eliminated only the plants which showed prominant symptoms as a result of planting virus Y- infected seed tubers or early infection of virus Y in the early stage of growth, but did not eliminate those which showed no obvious symptoms as a result of late infection in the late stage of growth, As a consequence , the seed-tubers of these late infected plant served as the source of the primary inoculum for the next crop.

花叶型退化病在广东普遍而严重发生,但中山、潮汕等地一些农民通过选种(淘汰病株)几十年来把此病压低到10—5%以下。 根据指示植物、寄主范围、传病方式、物理性质和血清反应(只试x病毒)等试验结果,我们鉴定了广东马铃薯花叶型退化病株中最普遍存在的两种病毒为马铃薯病毒x和马铃薯病毒y。 从23个品种940株“健株”和表现不同程度退化的植株中进行分离接种鉴定,结果表明,表现退化的植株绝大多数含“x+y”或y;“健株”绝大多数仅含x不含y,少数既不含x也不含y。其中有7个品种还分离不到x。土温测定结果表明广东中山等地冬种马铃薯的土温基本适合于马铃薯生长,田间黄皿诱蚜结果表明y的传病媒介蚜虫(棉蚜和桃蚜)是存在的。因此,认为在广东本病的流行是由于新侵染所引起。农民选种防病的原理在于每年把带病毒y的种薯所长出的和早期感染病毒y的症状明显的病株和薯块除去,留下没有感染的健株和少数后期感染而症状不明显的病株的薯块作种薯,因而每年都能把病毒控制到10—5%以下。

 
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