1,721,037 research outputs found
Anagrus incarnatus 之發生及對二種稻蝨寄主卵之偏好性
No full textField surveys were conducted in several, sites to study occurrence of Anagrus incarnatus Haliday and its parasitism on eggs of rice brown plant-hopper (BPH). A. incarnatus population increased with the increment of BPH at first and second cropping seasons. It peaked during the ripening stage of rice plants at about 46% parasitism at Si-chou in both cropping seasons. The host preference of A. incarnatus to eggs of Nilaparvata lugens Stal (BPH) and small brown planthopper, Laodelphax striatellus (Fallen) (SBPH) was determined in the laboratory by free- and no-choice tests. The parasitoid preferred BPH to SBPH eggs in a free choice test. More A. incarnatus foraged on rice plants infested with BPH eggs than those infested with SBPH eggs, and more A. incarnatus progeny emerged from BPH than from SBPH eggs. The relationship between BPH infesting densities and the emergent A. incarnatus is linear regardless if rice variety is suscep tible or resistant to BPH. The impact of the parasitoid on rice planthop pers is discussed.
本試驗於本省中部地區調查卵寄生蜂Anagrus incornotus Haliday之發生及對稻蝨之寄生率，結果顯示無論一、二期作，該蜂族群隨其寄主褐飛蝨密度之增加而上升，其寄生率之高峰在水稻成熟期，而以溪州之46％為最高。室內以自由選擇與無選擇試驗進行測定該蜂對褐飛蝨與斑飛蝨卵之偏好性，結果顯示該蜂對褐飛蝨卵俱偏好性，較喜在產有褐飛蝨卵之稻株上找尋寄主產卵，而較少於產有斑飛蝨卵之稻株上尋找。無論水稻品種為感蟲或較抗蟲者，該蜂羽化數與褐飛蝨接蟲密度呈直線關係。同時，自被寄生之褐飛蝨卵羽化之該蜂數，遠比自被寄生之斑飛蝨卵者為多。該蜂乃本省稻蝨之有效卵蜂
兩種赤眼卵寄生蜂在五種定溫之發育與自寄主卵之相對回收率
No full textTrichogramma embryopha gum Hartig and T. ostriniae Pang & Chen were compared their development in eggs of Ostrinia furnacalis Hülbner at five constant temperatures of 14, 18, 22, 26, and 30℃ in laboratory. T. ostriniae failed to develop at 14℃, and both species decreased their developmental period as the temperature increased. T. embryopha gum performed better in parasitism under 22℃, significantly lived longer especially at 18 and 26 CC, had highly significantly lower female sex ratio at 30℃, and predominated over T. ostriniae in recovery percentage from host eggs.
室內測定二種赤眼卵寄生蜂，Trichogramma embryophagum與T. ostriniae 在14,18,22,26及30℃等五種定溫下，在亞洲玉米螟卵內之發育。結果顯示T. ostriniae在14℃時不能完成嶺育，且兩種卵寄生蜂之嶺育期隨溫度之升高而縮短。T. embryophagum在溫度低於22℃時，對玉米螟卵之寄生率優於T. ostriniae；其雌蜂壽命較本地種為長，尤以在18與26℃時二者呈顯著差異；該蜂在30℃時之雌性比極明顯較T. ostriniae為低，但其自寄主卵之回收率，則比此本地種為優
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Platygaster hiemalis Forbes在抗性小麥品種對瘦蚊之寄生
No full textLaboratory studies were conducted to determine the effects of three wheat cultivars, “Knox 62” “CaldwelI” and “Monon”, on the Hessian fly Mayetiola destructor (Say) and its parasitoid Platygaster hiemalis Forbes. The number of Hessian flies that survived from egg to flaxseed stage, the number of Hessian flies parasitized by P. hiemalis, and the average number of parasitoids produced within each parasitized pupa were used to determine the cultivar and the interaction effects on the Hessian fly as well as on the parasitoid. The fewest Hessian fly survived, and the smallest parasitism was found on Knox 62 and were significantly different from those on other cultivars. Results showed that a cultivar with highly antibiosis against the Hessian fly could also reduce the effectiveness of this parasitoid. However, resistant cultivars and parasitoid complemented each other in reducing the numbers of the Hessian fly.
室內測定Knox 62、Caldwell及Monon三種小麥品種與寄生蜂Platyaster hiemalis Forbes及二者之交感作用對小麥癭蚊存活數、被寄生數及自被寄生癭蚊蛹羽化之P. hiemaIis蜂數等之影響，結果顯示Knox 62品種上，癭蚊之存活率與被寄生率均最低且與其他品種者差異顯著，此說明具高度抗生作用之小麥品種可減低瘦蚊密度但亦能影響該種蜂之寄生效果，雖然如此，一般而言，抗蟲小麥品種與P. hiemalis寄生蜂二者可相輔相成，合力降低小麥癭蚊之族群密度
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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