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Responses of source-sink manipulations on yield production and sucrose synthase activity in grains of selected rice (Oryza sativa L.) varieties
Get PDFThe unbalanced allocation pattern of assimilate within panicle has contributed to a
significant reduction in grain yield. Thus, the present research was undertaken to assess
the physiological factors influencing assimilate partitioning pattern of Malaysian rice
varieties. The first study was conducted for determining the genotypic variations on
yield and yield components among different rice varieties, so as to identify few
components limiting the rice yield. Ten Malaysian rice varieties (Sri Malaysia, Kadaria,
Seberang, Pulut Siding, MR84, MR219, MR211, MR167, MR103, MR263) were grown
in polybag culture under glasshouse condition. The significant correlation between
grain yield and harvest index (r = 0.38*) indicated that the remobilization of assimilate
from the vegetative parts of plant is critical to improve the grain yield. However, the
negative correlation between grain size and the filled grain in the basal spikelet (r = -
0.43***), suggested that there was an unbalanced assimilate partitioning pattern among
all ten rice varieties. Similarly, less than 100% of the filled grain resulted for all ten rice
varieties.
In studying the grain filling process, the second study was conducted for evaluating and
elucidating the response of source-sink manipulations on; (a) the grain yield and yield
components, and (b) the trend of sucrose synthase (SuS) activity in the grains among
different rice varieties, respectively. Five Malaysian rice varieties (MR263, MR219,
MR167, MR84, Pulut Siding) from the first study were subjected to four treatments; i.e.
50% flag leaf cutting, 25 and 50% spikelet removal, and control. Manipulations on
grain number have decreased the grain yield in all five rice varieties. The 25 and 50%
spikelet removal have increased the grain size of varieties MR167 and Pulut Siding, as
well as the filled grain in the basal spikelet of variety MR84, thus lowering their grain
yield reduction (less than 25 and 50%). The filled grain was greater in the apical
spikelets, suggested that there might be an inadequate supply of assimilate to the basal
spikelets. The flag leaf cutting has reduced about 9 - 14% of grain yield, as well as the
filled grains (4 – 11%) in all five rice varieties.
Reducing the source strength (flag leaf cutting) did not significantly affect the sucrose
content in the apical and basal grains because of the compensation from other vegetative
parts of the plant. The 25 and 50% spikelet removal created a situation of lower sink
demand which contributed to the higher SuS activity in the apical (2 - 9%) and basal
grains (3 – 21%) thereby reduced the sucrose accumulation in grains. The positive
correlation between the SuS activity and sucrose content revealed that the sink strength
influenced the sucrose accumulation in grains. However, the SuS activity, especially in
the basal grains of varieties MR263, MR219, MR167, and Pulut Siding, was more
sensitive under the adverse condition of the source-sink manipulations.
Through the study, the grain yield can be increased through increased in biomass
production or assimilate partitioning to the sink, which would require to study the grain
filling process further. Less than 80% of filled grain for varieties MR263, MR219,
MR167, and MR84 suggested that their grain yield was limited by the source strength.
The significant increment of grain size and more than 80% of filled grain for variety
Pulut Siding suggested that the grain yield was limited by both the source strength and
sink capacity. With a limited assimilate from the source parts, the assimilate
partitioning trend would be depended on the sink strength (eg. SuS activity). The lower
SuS activity could be one of the reasons causing the lower starch content and higher
sucrose accumulation in the basal grains
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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