1,720,956 research outputs found
Microsatellite analysis of common bean (Phaseolus vulgaris L.) genotypes in Tanzania for diversity in seed iron and zinc micronutrients
No full textJournal articleCommon bean (Phaseolus vulgaris L.) grain has big dietary role in
supplying protein, energy, vitamins, dietary fibre and micronutrients for
millions of people worldwide. In Tanzania, reports have shown existence of
Fe and Zn micronutrient variabilities among the common bean genotypes.
Eighty-four (84) genotypes were collected to study such variability by seed
biochemical and leaf molecular marker analysis. The analyses revealed
significant (p < 0.001) genetic variability for seed Zn and Fe nutrient
contents. Highest seed Fe content was 118 ppm for genotype Kashiransoni
and for seed Zn was 51.81 ppm for Imponzo 5 genotype (both were
collected from NPGRC). With seven (7) SSR primers associated with Fe and
Zn traits, genetic diversity was evaluated. A marker BM154 scored PIC
value 0.967 mean while marker BM160 had a lowest PIC score of 0.899.
Using an estimated genetic similarity value, two main clusters with sub
clusters in the dendrogram were developed. To corroborate the UPGMA
analysis results, a Principal Coordinate Analysis (PCoA) was performed
and displayed outputs into scattered plot presentation. For Fe
micronutrient improvement purposes, Inula was proposed to be crossed
with Kashiransoni while Roba with Imponzo 5 for Zn micronutrient
improvement. Selection was based on both concentrations of nutrients for
each genotype and their genetic similarity distances
Variability of common bean (Phaseolus vulgaris L.) in Tanzania as evidenced by morphological assessment
No full textResearch articleA total of 84 common bean (Phaseolus vulgaris L.) accessions were collected
from different areas of Tanzania serving as source of germplasm. Nineteen agromorphological
traits of 84 common bean accessions were assessed to analyze
the variability as a core objective for this study. Among all the accessions,
40.48% were characterized by indeterminate bush with moderate climbing ability
and pods distributed evenly up to the plant habitus followed by 36.9%. Similarly,
14.29% were the genotypes with indeterminate bush with semi-climbing main
stem and branches habitus genotypes. Also, 14.29% were the genotypes with
the indeterminate bush with prostrate, and 7.14% were the genotypes with
indeterminate bush with erect branches habitus while 1.19% were the genotypes
with determinate bush least. Phonological, quantitative and qualitative traits
were evaluated and their scores were subjected to principal component analysis
and cluster analysis. The phylogenetic tree demonstrated 2 major clusters
which were further divided into sub-clusters. Principal component analysis
accounted for the accumulative variance of 35.78% revealing morphological
variation highly attributed with variables which had greater than 0.2 Eigen
values. The study demonstrated low morphological variation among the
genotypes and emphasized the need to broaden genetic variability of the
common bean in Tanzania. The results of this study can be used to select the
valuable breeding material for use. Besides, molecular markers can be deployed
to assess further the variability and diversity of these genotypes
Variability of common bean (Phaseolus vulgaris L.) in Tanzania as evidenced by morphological assessment
No full textResearch articleA total of 84 common bean (Phaseolus vulgaris L.) accessions were collected
from different areas of Tanzania serving as source of germplasm. Nineteen agromorphological
traits of 84 common bean accessions were assessed to analyze
the variability as a core objective for this study. Among all the accessions,
40.48% were characterized by indeterminate bush with moderate climbing ability
and pods distributed evenly up to the plant habitus followed by 36.9%. Similarly,
14.29% were the genotypes with indeterminate bush with semi-climbing main
stem and branches habitus genotypes. Also, 14.29% were the genotypes with
the indeterminate bush with prostrate, and 7.14% were the genotypes with
indeterminate bush with erect branches habitus while 1.19% were the genotypes
with determinate bush least. Phonological, quantitative and qualitative traits
were evaluated and their scores were subjected to principal component analysis
and cluster analysis. The phylogenetic tree demonstrated 2 major clusters
which were further divided into sub-clusters. Principal component analysis
accounted for the accumulative variance of 35.78% revealing morphological
variation highly attributed with variables which had greater than 0.2 Eigen
values. The study demonstrated low morphological variation among the
genotypes and emphasized the need to broaden genetic variability of the
common bean in Tanzania. The results of this study can be used to select the
valuable breeding material for use. Besides, molecular markers can be deployed
to assess further the variability and diversity of these genotypes
Microsatellite analysis of common bean (Phaseolus vulgaris L.) genotypes in Tanzania for diversity in seed iron and zinc micronutrients
No full textJournal articleCommon bean (Phaseolus vulgaris L.) grain has big dietary role in
supplying protein, energy, vitamins, dietary fibre and micronutrients for
millions of people worldwide. In Tanzania, reports have shown existence of
Fe and Zn micronutrient variabilities among the common bean genotypes.
Eighty-four (84) genotypes were collected to study such variability by seed
biochemical and leaf molecular marker analysis. The analyses revealed
significant (p < 0.001) genetic variability for seed Zn and Fe nutrient
contents. Highest seed Fe content was 118 ppm for genotype Kashiransoni
and for seed Zn was 51.81 ppm for Imponzo 5 genotype (both were
collected from NPGRC). With seven (7) SSR primers associated with Fe and
Zn traits, genetic diversity was evaluated. A marker BM154 scored PIC
value 0.967 mean while marker BM160 had a lowest PIC score of 0.899.
Using an estimated genetic similarity value, two main clusters with sub
clusters in the dendrogram were developed. To corroborate the UPGMA
analysis results, a Principal Coordinate Analysis (PCoA) was performed
and displayed outputs into scattered plot presentation. For Fe
micronutrient improvement purposes, Inula was proposed to be crossed
with Kashiransoni while Roba with Imponzo 5 for Zn micronutrient
improvement. Selection was based on both concentrations of nutrients for
each genotype and their genetic similarity distances
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
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