1,721,127 research outputs found
(39(4):303-314)Reaction of Rice Varieties and Selections to Blast in the Uniform Blast Nurseries
No full text水稻抗稻熱病統一病圃自民國63年至78年，16年間先後計檢定2,118個水稻品種（系）。水稻罹病情形因年度及地區而異。一般言之，稉稻品種（系）較秈稻者易罹稻熱病，尤以穗稻熱病為甚。稉稻品種（系）在第1期作亦較第2期作容易罹病，而秈稻者適相反。水稻品種（系）對葉與穗稻熱病之抵抗性反應成顯著之正相關，惟尚有少數例外。又水稻品種（系）在旱田式病圃對葉稻熱病之反應與其在水田式病圃者頗為一致，但其發病程度較水田式病圃者嚴重。本省育成之抗病品種目前多數已淪為感病，此顯示加強選育持久性抗病品種之重要性，尤其是稉稻。A total of 2,118 rice varieties and selections were tested for their reaction to blast at two to five uniform blast nurseries during a 16-year period from 1974 to 1989. The incidence of blast varied with years and nurseries. In general, Japonica rices were more susceptible to the disease than Indicas, particularly to the panicle blast. Entries of Japonica type appeared more severe to blast in the first crop season while the Indicas were more sensitive in the second crop season. The reaction of rice varieties and selections to leaf blast was significantly correlated with that to the panicle blast, although a lack of agreement was observed in certain entries. Blast incidence recorded in the upland nursery was also observed to be closely related to that recorded in the paddy nursery, though the degree of incidence in the upland nursery was more severe than that in the paddy nursery. Unfortunately, most of newly developed blast-resistant varieties were easy to be breakdown and became susceptible within a period of 1 to 3 years after they were released for commercial cultivation in a wide area, this suggests the importance of developing more stable and longer lasting resistance to blast in rice, particularly for Japonica rice
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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
Full text linkWe 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
Full text linkWe 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
(20(3):12-20)水稻品種對褐飛蝨（Nilaparvata lugens Stal)之抵抗性研究
No full textEighteen rice varieties introduced from the International Rice Research Institute (IRRI) and four local commercial varieties were evaluated for their resistance to the brown planthopper in the first and second crops of 1970 at the Chiayi Agricultural Experiment Station. Among IRRI introductions, H 105, Muthumanikam, and IR 9-60 were rated as highly resistant; Mudgo, ASD 7, Kayama MGL 2, Vellanlangalayan, IR 747 B2-6-3 and IR 1154-243 as resistant; PTB 18 as moderately resistant; DV 139 and AC 435 as moderately susceptible; DK 1, Bir-tsan No.3, IR 8, and IR 20 as susceptible, and Pankhari 203 and Zenith as highly susceptible. Four local commercial varieties Chianan 8, Tainan 5, Kaohsiung shen 2, and Taichung native 1 all fell in the category of being highly susceptible.
The evidence from F1, F2, and F3 generations of the category of being highly susceptible. IR 9-60 and susceptible varieties Taichung native 1 and IR 8 fitted the hypothesis that resistance to the brown planthopper in rice strain IR 9-60 is conditioned by a single recessive gene.
嘉義農業試驗分所於民國59年第1、2期作檢定水稻品種對褐飛蝨之抵抗性反應。初步結果顯示，由國際稻米研究所引進之18個品種系中，H 105, Muthumanikam及IR 9-60屬於極抗級；Mudgo，ASD 7 Kayama MGL 2，Vellanlangalayan , IR 747 B5-6-3,及IR 1154-243 屬於抗級；PTB 18屬於中抗級；DV 139及AC 435屬於中感級；DK 1, Bir-tsan No.3, IR 8 及 IR 20屬於感級；而Pankhari 203及 Zenith則屬於極感級。本省推廣品種嘉南 8 號，臺南 5 號，高雄秈 2 號，及臺中在來1號均屬於極感級。
抗蟲品系 IR 9-60，感蟲品種臺中在來1號與IR 8所得Fl, F2及F3雜交後裔對褐飛蝨之反應顯示水稻品系IR 9-60所具抗蟲性，符合於1對隱性因子所控制之假設
(25(1):1-6)STUDIES ON THE GRAIN DORMANCY AND SHATTERING HABIT OF LONG-GRAIN INDICA RICE
No full text為明瞭新育成推廣之長粒型秈稻品種嘉農秈6.8.11號之種子休眠性，適當的稻種預措方法及脫粒性等以謀發揮其優越之生產潛力，減少損失，於63年二期作至64年一期作在本分所進行本試驗。結果摘錄如下：
1. 嘉農秈品種具有長短不同的短期休眠性，嘉農秈6號之休眠期最長，約為兩週左右，嘉農秈8號次之，約為7天前後，而嘉農秈11號似未具休眠性；故嘉農仙6.8號之稻種在收穫乾燥後至少須分別存放兩週或一週以上，而嘉農秈11號之稻種亦應充分乾燥後方可供下期作播種之用。
2. 稻穀收穫後，須充分乾燥至含水量在13度以下，一期作在播種前須浸種48~72小時，催芽24小時；而二期作應浸種24小時，催芽24小時，方能確保稻種之發芽車與發芽整齊度。
3. 嘉農秈三個品種均屬於較易脫粒之品種，尤以嘉農秈8號最易脫粒，嘉農秈11號次之，而以嘉農秈6號較難脫粒；又嘉農秈6.8號有隨著成熟度之增加而愈易脫粒之現象，應適時採收以減少田間損失率；但嘉農秈11號具有愈成熟愈不易脫粒特性，故其採收延誤時應無嚴重之損失。
This experiment was aimed to study the grain dormancy, seed pretreatments and
shattering habit of new-improved long grain Indica rice varieties Chianung sen 6, 8 and 11 in order to exploit their full potentiality and reduce the possible losses. The trial was conducted from the second crop of 1974 to first crop of 1975 at the Chia-yi Agricultural Experiment Station. The results are summaried as follows:
1. The dormancy period of Chianung sen varieties differed significantly. Chianung sen 6 appeared to have the longest dormant period of two weeks and Chianung sen 8 had dormant period of 7 days, while Chianung sen 11 had no appreciable period of dormancy. Hence, the grains for seed purpose should be stored for one or two weeks before seeding for Chianung sen 6 and 8. The grains of Chianung sen 11 should also be properly dried.
2. In order to obtain satisfactory and faster germination, the grains of Chianung sen varieties should be dried to the moisture content of less than 13 percent and soaked 48-72 hours with presprouting treatment of 24 hours in the first crop season. It should also be soaked 24 hours with 24 hours of presprouting in the second crop.
3. The degree of grain shattering of Chianung sen varieties was in the order of Chianung sen 8, 11 and 6, i. e. Chianung sen 6 gave greater resistance to shattering than Chianung sen 11 and 8.On the other hand, the shattering resistance of Chianung sen 6 and 8 decreased with the progress of ripening, but the opposite was true with Chianung sen 11. Thus, Chianung sen 6 and 8 must he harvested at the proper stage of maturity, while the losses from shattering may be light for Chianung sen 11 even if it is harvested over-ripe
(20(1):57-60)INHERITANCE OF RESISTANCE TO BROWN PLANTHOPPER IN RICE VARIETY, MUDGO
No full text嘉義農業試驗分所59年第二期作以人工接種方法檢定臺中在來1號 × Mudgo 之 F1,F2及F3雜交後裔與IRS × Mudgo之F2植株，以及其親本對褐飛蝨之抵抗性，初步試驗結果，顯示水稻品種Mudgo所具抗蟲性為由一對顯性遺傳因子所控制。
The experiment was conducted at the Chia-yi Agricultural Experiment Station in the second crop of 1970. The reaction of F1, F2 plants and F3 families of T (N) 1 × Mudgo, and the F2 plants of IR8 × Mudgo were evaluated under artifical infestation with brown planthopper nymphs. Mudgo is highly resistant to the brown planthopper whereas IR8 and T (N) 1 are susceptible to this instect.
The results obtained are summarized as follows:
1.The F1 plants of T (N) 1 × Mudgo were as resistant as Mudgo, showing that the resistance to the brown planthopper in Mudgo is completely dominant.
2.The reaction of F2 plants of T (N) 1 × Mudgo and IR8 Mudgo to the brown planthopper agreed satisfactorily to the probability for monogenic inheritance, indicating that the resistance of Mudgo is controlled by one dominant gene.
3.The homozygous resistant, segregating, and homozygous susceptible F3 lines of T (N) 1 × Mudgo were close to an expected ratio of 1:2:1. This results further support the hypothesis that resistance to the brown planthopper in the variety Mudgo is conditioned by a single dominant gene
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