1,720,953 research outputs found
Effects of cultivar and planting period on growth, yield, macilage and nutritional composition of corchorus olitorius under field and shade house conditions
Get PDFThesis (M.Sc. (Horticulture)) -- University of Limpopo, 2022The awareness of the nutritional benefit and consumption of the Jew’s mallow (Corchorus olitorius L.) especially in South Africa is low; this is predominantly because of lack of access and availability of the crop in the market. This research aimed to determine to what extent would the planting period affect mucilage, growth, yield and nutritional composition of the selected C. olitorius cultivar under different growing conditions and provide a better understanding and scientific evidence for the producers to maximize production. The experiments were carried out simultaneously, the first experiment (field trial), was on the field and the second (pot trial) in the shade house. Treatment factors were: 2 x growing conditions (field and pot), 4 x planting periods (November, December, January and February) and 3 x C. olitorius cultivars (‘Local’, ‘Oniyaya’ and ‘Amugbadu’). The experiments were carried out as randomised complete block design (RCBD) arranged in split-spilt plot with three replications. Growing condition was the main factor, planting period as the sub-factor, while the cultivars were the sub-subplot factor. Mucilage content, growth and yield parameters were measured and nutritional composition of the crop was determined from harvested plant samples.
Mucilage content of C. olitorius varied with cultivar and growing condition. The significantly (P < 0.05) highest quantity of mucilage at 8 WAT was obtained from Oniyaya cultivar under field condition whereas the least was recorded from Local cultivar under pot condition. The mucilage content of the three cultivars did not differ significantly (P ≤ 0.05) at 6 WAT, however significant (P < 0.01) differences were recorded at 8 WAT. The cultivar Oniyaya produced significantly highest average (184.58 mPa.s) mucilage content at 8 WAT while the lowest average value (124.58 mPa.s) was recorded in the Local cultivar. This implies that Oniyaya cultivar produced the slimiest plants. The mucilage content of Jew’s mallow appears to decline over time; thus, the crop had higher mucilage content when young and tender.
Selected growth parameters such as chlorophyll, number of leaves and stem diameter were significantly affected by the combined effect of cultivar, planting period and growing condition. For example, the average highest chlorophyll content was obtained in Oniyaya cultivar during November period under pot conditions. While the greatest number of leaves at 8 WAT were obtained in Oniyaya and Local cultivars during
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December planting period and in Amugbadu during November period all under the field conditions. All cultivars grown during the February planting period had the lowest average number of leaves.
Growth parameters such as number of branches, plant height and leaf area were not significantly (P ≤ 0.05) affected by the combined effect of cultivar, planting period and growing condition. Significant (P < 0.05) combined effect of cultivar and planting period was recorded on number of C. olitorius branches at 6 WAT. Furthermore, significant interaction between planting period and growing condition was also recorded. The significantly higher number of branches at 6 WAT was obtained from Oniyaya and Amugbadu cultivars during the November planting period. The test crop seedlings transplanted in February had the lowest average number of branches. Comparing the cultivars at 6 and 8 WAT, Oniyaya produced significantly (P < 0.01) higher number of branches than Local. Local cultivar was significantly taller than others under the field condition; while significantly tallest plant was obtained during December period under the same condition. The differences observed in C. olitorius shoot and root fresh and dry masses were not significantly different in their responses in relation to the combined effect of cultivar, planting period and growing condition. However, the significantly highest average fresh shoot mass was obtained during December period and the lowest average values in February planting period.
The combined effect of cultivar, planting date and growing condition had significant (P < 0.01) influence on number of days to 50% flowering; pod formation and pod maturity of C. olitorius. The significantly longest average number of days to 50% flowering was observed in Oniyaya and Amugbadu cultivars during November period under field condition, while Local cultivar flowered at the shortest period, but produced highest number of pods and seed yield during the December planting period under the same condition.
Cultivar, planting date and growing condition had significant (P < 0.01) influence on Zinc contents of C. olitorius. Whereas the three factors had no significant effect on N, Ca, Mg, K, Na, Mn, Fe, P, Al, ash and dry matter contents of the crop. The highest average amounts of N, Mg and K were obtained from Local cultivar during November period while the same cultivar produced the highest average amount of Ca during December period. In conclusion, the mucilage content and fresh shoot mass (which is
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the marketable part of C. olitorius) were optimal in crops grown during the December planting period when the temperatures are at the highest. While better nutritional content of the crop was better attained during the November planting period. Both November and December planting periods allowed C. olitorius to reach its maximum growth capacity, translating to higher yielding parameters than other planting periods
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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