1,720,960 research outputs found
POPULATION SELECTION IN F 3 AND BACKCROSS GENERATION OF Brassica rapa L.
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Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDINGAt the experimental field of Sher-e-Bangla Agricultural University in Dhaka, an
experiment was undertaken from November 2021 to February 2022 with 46
populations of Brassica rapa L. (38 F
3
and 8 BC
2
F
2
populations), to estimate genetic
variability, correlation, heritability, genetic advance, and direct and indirect effects of
different traits for seed yield contributing traits. The analysis of variance exhibited
significant variations in all the attributes among all populations. Days to first
flowering, number of primary branches per plant, days to 80% maturity, siliqua length,
and thousand seed weight exhibited the least difference between genotypic and
phenotypic variance, indicating that the environment less influences these traits. The
number of secondary branches per plant, the number of siliquae per plant, number of
seeds per siliqua, and seed yield per plant however, were found to have high genotypic
and phenotypic coefficients of variation. Days to first flowering, days to 80% maturity,
number of secondary branches per plant, number of seeds per siliqua, siliqua length,
and thousand seed weight all showed high heritability with low genetic advance which
could further be improved by subsequent generation advancing. Number of secondary
branches per plant, number of siliquae per plant, number of seeds per siliqua, and
thousand seed weight showed high heritability along with high genetic advance in
percentage of mean. In breeding program, heritability accompanied by higher genetic
advance as percentage of mean is considered useful in identifying high yielding
genotypes. According to a correlation study, at both the phenotypic and genotypic
levels, seed yield per plant was positively and significantly associated with days to
80% maturity, plant height, number of primary and secondary branches per plant,
number of siliquae per plant, and siliqua length. Through path coefficient analysis, it
was found that there was a direct positive effect on seed yield per plant in terms of
days to 50% flowering, days to 80% maturity, number of primary branches per plant,
number of secondary branches per plant, number of siliquae per plant, siliqua length,
and number of seeds per siliqua. Characters like days to 80% maturity, plant height,
number of primary branches per plant, number of secondary branches per plant,
number of siliquae per plant, siliqua length, number of seeds per siliqua, and seed
yield per plant would be considered while making the selection process. Among 46
populations (38 F
3
and 8 BC
2
F
2
populations), on the basis of short duration 5 F
3
populations such as G4 (81.67 DAS), G16 (81.67 DAS), G26 (80.67 DAS), G27
(82.33 DAS), G28 (80.67 DAS) can be recommended. For high yield 2 F
3
population
such as G37 (9.49 g), and G38 (10.08 g), and 3 BC
2
F
2
populations such as G40 (12.31
g), G45 (10.62 g), and G46 (9.39 g) can be recommended for evaluation trial
DISTRIBUTION, HOST PREFERENCE AND DAMAGE SEVERITY OF MANGO MEALYBUG IN DHAKA CITY AND ITS MANAGEMENT
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Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY
SEMESTER: JULY - DECEMBER, 2015The present study was conducted at the field of Sher-e-Bangla Agricultural University, Sher-e-
Bangla Nagar, Dhaka and 45 thanas of Dhaka city during the period from November, 2015 to
May, 2016 to know the distribution, host preference, damage severity and management of mango
mealybug. Four chemical insecticides and two mechanical bands were evaluated against
mealybug at mango orchard of Sher-e-Bangla Agricultural University campus. Mango mealybug
was recorded from six thanas out of 45 thanas in Dhaka city. Jackfruit was common host at all
locations followed by mango. Comparatively higher infestation occurred on fruit of jackfruit
compared to inflorescence and branch. In case of mango, more infestation occurred on
inflorescences than branch and fruit. Severe infestation was observed on fruit for jackfruit and
inflorescence of mango in most of the locations. Carbaryl was the most effective insecticide
against mango mealybug which reduced maximum population of mango mealybug (86.70% after
7 days and 92.70% after 15 days of spray) followed by Thiamethoxam. Cotton band and
polythene band with grease were found effective for reducing the mealybug populations of
mango tree
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
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