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Whole-Genome Sequences of Three Plant Growth-Promoting Rhizobacteria Isolated from Solanum tuberosum L. Rhizosphere in Tanzania.
Get PDFThis research article published by the American Society for Microbiology, 2020We present here the complete genome sequences of plant growth-promoting sp. strain MPUS7, sp. strain NGAS9, and sp. strain LUTT5, isolated from rhizosphere soils and tubers of potato ( L.) plants growing in the northern and southern highlands of Tanzania
Characterization of rhizobacteria and their formulation into biofertilizers for potato (solanum tuberosum l.) growth promotion in Tanzania
Get PDFA Thesis Submitted in Fulfillment of the Requirements for the Degree of Doctor of
Philosophy in Life Sciences of the Nelson Mandela African Institution of Science and
TechnologyRhizobacteria and their plant growth-promoting (PGP activities have widely been investigated as
biofertilizers for many crops but rarely for the potato (Solanum tuberosum L.). In the present
study, potato-grown soils from three agro-ecological zones in Tanzania were sampled,
characterized, and a total of 145 rhizobacteria isolated from them. The isolates were screened in
vitro for PGP activities like nutrients solubilization, nitrogen fixation, and phytohormones
production, and 52 most-promising isolates were characterized and identified by 16S-rRNA
sequencing. Their effects on pot-grown potatoes were evaluated against non-inoculated plants as
controls. Klebsiella grimontii MPUS7, Serratia marcescens NGAS9, and Citrobacter freundii
LUTT5 were selected based on their effects on pot-grown potatoes and formulated in different
carrier materials as possible biofertilizers. Their shelf lives were determined as colony-forming
units (CFU) under refrigerated (8
o
C) and room conditions (25 ± 2
o
C) for eight months and their
effects on field-grown potatoes evaluated against recommended fertilizers and non-treated
plants. Data analysis involved XLSTAT (2.3). Significant differences (p ≤ 0.05) were evident for
the fertility-related properties of the sampled soils but not their nutrient contents. Though slightly
acidic (pH < 6.5), non-saline (Electrical conductivity < 1 dS m
-1
), and greater proportions of silt
+ clay (average 46.85 ± 15.18%) than gravel and sand, the soils contained low nutrient levels
which may not be ideal for potato production. The rhizobacteria significantly differed in their invitro
PGP
activities.
Except
for
the
number
of
days
to
emergence
and
flowering,
rhizosphere
soil
pH,
and salinity, potato growth-related parameters like tuber numbers, sizes, weights, and
nutrient contents were enhanced by the rhizobacterial treatments in the screen house by up to
90%. The PM-1 formulation supported the maximum K. grimontii MPUS7 growth (5.3 log-CFU
g
-1
) under refrigeration and C. freundii LUTT5 (4.1 log-CFU g
-1
) under refrigerated and room
conditions but the highest K. grimontii MPUS7 population (3.7 log-CFU g
-1
) was realized in
room-stored PM-4. The formulations also showed varied activities at enhancing potato growth
and most had similar or greater effects on potato growth as the artificial fertilizers and can
effectively be used to replace the use of synthetic fertilizers in potato production systems in
Tanzania
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
In vitro biodegradation of low molecular weight polyethylene using bacteria isolated from Lake Bogoria hot spring and selected landfills in Kenya
No full textStudents' projectThe study aim at determining the potential and assessing the characteristics of bacteria isolated from Lake Bogoria hot spring and selected landfills in Kenya.NACOST
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
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