1,720,966 research outputs found
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
Isolation, identification and pathogenicity of local entomopathogenic bacteria as biological control agents against the wild cochineal Dactylopius opuntiae (Cockerell) on cactus pear in Morocco
No full textThe Opuntia ficus-indica (L.) cactus, a crucial crop in Morocco, is threatened by the wild cochineal, Dactylopius opuntiae (Cockerell). The aim of this research was to investigate the efficacy of nine bacterial strains against both D. opuntiae nymphs and adults females applied individually or after black soap in the laboratory, greenhouse, and field conditions. Using the partial 16S ribosomal DNA, the bacterial isolates were identified as Pseudomonas koreensis, Pseudomonas sp., Burkholderia sp. and Bacillus sp. Under laboratory conditions, the insecticidal activity of P. koreensis strain 66Ms.04 showed the level mortality (88%) of adult females’ at 108 CFU/mL, 7 days after application. At a concentration of 108 CFU/mL, P. koreensis strain 66Ms.04 and Pseudomonas sp. (strains 37 and 5) caused 100% nymphs mortality rate three days after application. Under greenhouse conditions, the use of P. koreensis strain 66Ms.04 at 108 CFU/mL following the application of black soap (60 g/L) demonstrated the maximum levels of females and nymphs’ mortalities with 80 and 91.25%, respectively, after 8 days of treatment. In field conditions, the combined application of the P. koreensis strain 66Ms.04 at 108 CFU/mL with black soap at 60 g/L, for an interval of 7 days, significantly increased the mortality of adult females to 93.33% at 7 days after the second application. These findings showed that the combined treatment of P. koreensis strain 66Ms.04 with black soap can be a potent and eco-friendly pesticide against D. opuntiae
Agricultural biocontrol potential of bacterial volatile organic compounds (bVOCs) for enhanced crop protection
No full textPlant diseases and insect pests present significant challenges to agricultural productivity, while nutritional deficiencies impede plant growth. Recent research has focused on plant growth-promoting rhizobacteria (PGPR), which regulate soil microbial populations and play an important role in geochemical nutrient cycles. Among the emerging strategies, volatile organic compounds (VOCs) produced by soil and plant microbiota offer promising eco-friendly alternatives to synthetic pesticides, with potential applications in disease control, growth promotion, and stress resistance.
This review explores the diverse applications of bacterial volatile organic compounds (bVOCs) in agriculture, detailing the progression from understanding their composition to their practical implementation in the field. Emphasizing their environmentally friendly nature, bVOCs have shown efficacy in controlling pathogenic fungi and insects, inducing plant stress resistance, and promoting growth. Furthermore, leveraging VOC-'omics approaches can help unravel the complexities of bacterial volatile metabolites and their pathways, providing unique insights into their biocontrol mechanisms. This knowledge paves the way for developing innovative biological solutions to enhance sustainability in agriculture. Additionally, the review analyzes recent patent trends, showcasing notable inventions in bVOCs technologies and formulations, over the past decade. However, despite these advancements, challenges such as high processing costs and lengthy screening procedures remain significant barriers to widespread adoption. Overcoming these obstacles and ensuring plant quality through continued research are crucial for accelerating the integration of VOCs into mainstream agricultural practices
Chemical Composition and Insecticidal Potential of Six Essential Oils from Morocco against Dactylopius opuntiae (Cockerell) under Field and Laboratory Conditions
No full textThe prickly pear Opuntia ficus-indica L. has an important economic role as a
source of food for human consumption, for cosmetic and pharmaceutical purposes, and as fodder
for livestock in Morocco. This crop is now attacked by a new sap-sucking insect pest, the wild-scale
Dactylopius opuntiae (Cockerell). The aim of this study was to investigate the insecticidal potential of
essential oils as alternative to synthetic insecticides for the control of D. opuntiae nymphs and adult
females under laboratory and field conditions. Results revealed that Mentha pulegium and Origanum
vulgare oils provided a rich source of bioactive compounds and exhibited high contact toxicity against
D. opuntiae. In addition, M. pulegium and O. vulgaris oils applied in combination with black soap
induced the highest toxic activity on adult females under field conditions.
Abstract: The carmine cochineal Dactylopius opuntiae (Cockerell) is the major insect pest of the prickly-
pear cactus Opuntia ficus-indica (L.) in Morocco. The present study investigated the insecticidal
activities of six essential oils (EOs) against nymphs and adult females of D. opuntiae applied singly or
in combination with a detergent under laboratory and field conditions. Under laboratory conditions,
M. pulegium and O. vulgare L. essential oils showed a high level of insecticidal activity at 5%, with 98%
and 92% females’ mortality, respectively, 5 days after treatments. The M. pulegium and O. vulgaris
oils at 5% applied in combination with black soap at (60 g/L) induced the highest toxic activity
on adult females, 100% and 96% at 5 days after treatments, respectively. Under field conditions,
M. pulegium and O. vulgare oils at 5% in combination with black soap (60 g/L) showed the highest
adult female mortalities with 96.33 and 92.56%, respectively, 7 days after the first application. The
double application of M. pulegium oil at 5% significantly increased the mortality of adult females up
to 91%, 5 days after the second spray. GC-MS analysis revealed that the most abundant constituent
of M. pulegium and O. vulgare oils was pulegone (84.69%) and durenol (76.53%), respectively. These
findings showed that the use of M. pulegium and O. vulgare in combination with black soap or in
double sprays could be incorporated in the management package for the control of the wild cochineal
D. opuntiae, as a safe and natural alternative to chemical insecticide
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