Davana： A New Host Plant for Ralstonia solanacearum from India

Ralstonia solanacearum infecting Davana （Artemisia pallens Wall.） from commercial nurseries in India was isolated on modified semi selective media （SMSA）. Here, we report a new host for Ralstonia solanacearum i.e. davana. It has huge demand in medicinal and aromatic industries. Isolate was confirmed as race-l, biovar-3 by morphological, physiological, biochemical and pathogenicity studies. Two sets of primers （OLI 1 ＆ Y2 and Y 1 ＆ Y2） were used in this study. Further, the identity of the isolate was confirmed by serological diagnostic kit obtained from International Potato Research Center, Lima, Peru and single chain variable fragment antibody specific to Ralstonia solanacearum used to confirm the casual organism.     

A New Host for Meloidogyne incognita （Kofoid ＆ White 1919） Chitwood, 1949 （Nemata： Tylenchida） in Turkey： Potato

Potato is the main material of nutrition comes after the wheat and, is subjected to attacks of different plant parasitic nematodes which cause serious damages in our country. Especially, root-knot nematodes cause serious crop losses on them. Due to usage oflnfested seeds, parasitic nematodes are increasing from year to year. In our country, so far, many infested hosts of Meloidogyne incognita （Kofoid ＆White, 1919） Chitwood, 1949 were detected but there is no report on investigation on potato. During this study, adult females of root-knot nematodes were obtained via extracting gals of 133 tuber samples, collected potatoes fields in the Marmara region especially Balikesir, Bilecik, Bursa, Canakkale, Edirne, Istanbul, Kirklareli, Kocaeli, Sakarya and Tekirdag provinces during 2007-2008. During identification the species, second stage larvae were taken into consideration as well as genital preparations of adult females. For the identification classical methods were used together with molecular methods. As result, M. incognita was detected, only species detected among the Meloidogyne genus upon the 10 provinces investigated in Edirne province, Bosna village. This is the first report of the infestation of this species potato and also in Marmara Region.     

基于汽车行驶记录仪的嵌入式USB主机系统的设计应用

以汽车行驶记录仪为背景,在CH375芯片基础上,给出了一种简单、实用的嵌入式USB主机系统的设计方案.并详细阐述了USB主机系统的相关协议、硬件接口电路和相应的软件设计方法.     

渔船主机余热远红外线烘干装置的探讨

节约能源是国家发展生产的长期性战略方针。海洋捕捞业属于耗能大户,整个捕捞业的耗能约占水产业总耗能量的70％。渔船的燃油消耗在生产成本中占有相当大的比例,吨鱼耗油量(因作业形式的不同而不同)在0.5—1.0吨之间。更严重的是,由于能源紧张,议价油成倍地涨价,有时在渔汛季节甚至买不到油,造成渔船停港待油的情景。在柴油机消耗的燃油总量中,转化为有用功的只有35—45％左右,随废气排到大气所带走的热量也相当于这个比例,约占30—43％。因此,废气的余热利用成了节能工作者十分紧迫的课题。     

介绍一种适宜于艉滑道渔轮用主机——6300ZC2型柴油机

艉滑道渔轮在国外已被广泛使用，国内正处于试用推广阶段。为使这种具有优越的拖网作业特点的优良船型更好更多地使用于我国水产渔业，宁波动力机厂设计、制造了适宜于渔滑道渔轮的6300ZC2型柴油机。     

CQL气胎离合器

目前，我国渔船主机前端装置普遍采用摩擦离合器驱动甲板渔捞机械。由于该离合器是刚性连接，安装时，轴线对准要求高，在使用中又往往存在较大的机械振动，接合不稳定，严重时甚至会发生断轴等现象。我公司借鉴日本尾滑道渔轮主机前端输出与甲板液压渔捞机械配套的先进设备及技术，结合国内渔轮的工况及现有工艺条件，在1982年试制成功CQL-600型(原称DFA-1型)气眙离合器，于1983年8月接受浙江省渔船联合设计室的委托，     

渔轮主机机座复板加工工具简介 可搬动的磨床

渔轮主机底座板的技术要求，不允许向纵桁内侧倾斜，表面光洁度△↓s，用平板检验时其接触点每25平方毫米不少于3点。其目的都是为了保证主机安装质量，达到(在螺栓旋紧之前)用塞尺0．05毫米不应塞进深度15毫米，在边缘四周能塞进的范围不超过35％的效果。几年来，我厂为了满足这一质量要求，均采用传统的铲刮办法。     

Stem Borer Species Composition on Maize and Two Non-Cereal Hosts in the Forest Zone of Kisangani,DRC

Lepidopteran stem borers are the most damaging pests of maize in Sub-Saharan Africa. Despite the growing importance of maize in the forest zone of Democratic Republic of Congo, no data is available regarding stem borer pest species present and their relative importance. It is thus important to gather information likely to guide future research in this area. This study was undertaken to catalogue stem borer pest species identity and assess their relative infestation levels on maize. Surveys were carried out in wild and cultivated habitats in Kisangani. Five species were collected on maize, i.e., Sesamia calamistis Hampson （1910）, Eldana saccharina Walker （1865）, Busseola fusca Fuller （1901）, Chilo sp. Strand （1913）, and Mussidia nigrivenella Ragonot （1888）. In the wild habitats, Poenoma serrata Hampson, B. fusca and S. calamistis were collected on Pennisetum purpureum whereas Chilo sp. was collected on Panicum maximum. Our results suggest that P. maximum might affect the population dynamics of Chilo sp. whereas P. purpureum is expected not to influence the population dynamics of other stem borers owing to its scarcity in the interior of the forest.     

DCLH—120型渔船主机电磁离合传动装置研制报告

我省群众渔船目前使用的前端离合器,绝大部分为70年代研制的手动圆锥磨擦离合器,难于适应渔业生产的发展。本型电磁离合器控制电压24V,额定扭矩1200N·m,适用转速500-1500r·P·min,可满足生产要求,而且传动效率高、操作方便、适应性广,是渔船技术改造的较理想的更新产品。     

Inlfuence of Host Shift on Genetic Differentiation of the Oriental Fruit Fly,Bactrocera dorsalis

Invasion of the oriental fruit lfy, Bactrocera dorsalis, into new niches containing different food sources （a process referred to as host shift）, may cause population genetic differentiation and sympatric speciation. To attempt to infer that experimentally, test populations were established by transferring a subset of the original populations, which had been grown on banana for many generations, onto navel orange, and then subculturing the navel orange population and banana population for at least 20 generations. Four pairs of SSR primers with high polymorphism on laboratory strains were used to detect population genetic differentiation. All six tested populations （the 5th, 10th and 15th generations of B. dorsalis fed on banana and navel orange, respectively） were found to have low genetic diversity. Furthermore, the genetic diversity of the navel orange populations was found to decline after being crossed for several generations. Populations initially were deviated from Hardy-Weinberg equilibrium, however, equilibrium was achieved with increasing numbers of generations in both of the host populations. Limited gene lfows were found among the six populations. The Nei’s standard genetic distances between the two host populations of the same generation were initially low, but increased with generation number. Genetic distances between banana and navel orange populations of the same generation were lower than genetic distances between different generations grown on the same host plant. Analysis of molecular distance （AMOVA） results based on generation groups and host groups demonstrated that genetic variation among generations was greater than that between the two host populations. The results indicated that population genetic differentiation occurred after the host shift, albeit at low level. Biogeography and taxonomy of the B. dorsalis complex revealed that speciation of B. dorsalis might be tightly associated with host shift or host specialization of B. dorsalis following dispersal.