1,720,966 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Betasatellites associated geminivirus diseases, a risk for vegetable crops in the Mediterranean area
Full text linkSome plant viruses are frequently associated with satellite molecules. Their infectious cycle depends on the so-called helper virus for replication, encapsidation, or transmission. Some of these molecules increase severity of viral symptoms and agronomic yield losses. Geminiviruses (family Geminiviridae) are among the most damaging viruses because they affect various important industrial and food crops including cotton, maize, cassava and vegetables crops (tomato, cucurbits). Begomovirus, the largest geminivirus genus comprises more than 300 viral species, which can be associated with satellites of three types, i.e. alphasatellites, betasatellites or deltasatellites. Whereas alphasatellites and deltasatellites are mostly harmless, betasatellites often increase viral symptoms and reduce yields dramatically. Betasatellite, widely distributed in Asia, the Middle East, and Africa, are now reported at the Eastern and Southern doorstep of the Mediterranean Basin. Their spread to new producing areas is matter of concern because all begomovirus species tested so far can be helper of different betasatellites and particularly begomoviruses reported in the Mediterranean, i.e., tomato yellow leaf curl virus (TYLCV) and tomato leaf curl New Dehli virus. The recent invasion of betasatellites in TYLCV infected tomato crops of Israel and Jordan and the fact that the invaded betasatellite can overcome the previously selected plant resistance to TYLCV is an example of the disaster that threaten this region. Moreover, the intensive production of vegetables in this region with year round crops is thought to be conducive for their adaptation and maintenance in this new environment. The main objective of our project is to check the presence /absence of betasatellite in the western part of the Mediterranean Basin and identify the main drivers of their installation, their ecology and interactions with plants and geminiviruses
Betasatellites associated geminivirus diseases, a risk for vegetable crops in the Mediterranean area.
No full textInternational audienc
Betasatellites associated geminivirus diseases, a risk for vegetable crops in the Mediterranean area
No full textSource Agritrop Cirad (https://agritrop.cirad.fr/602567/)International audienceSome plant viruses are frequently associated with satellite molecules. Their infectious cycle depends on the so-called helper virus for replication, encapsidation, or transmission. Some of these molecules increase severity of viral symptoms and agronomic yield losses. Geminiviruses (family Geminiviridae) are among the most damaging viruses because they affect various important industrial and food crops including cotton, maize, cassava and vegetables crops (tomato, cucurbits). Begomovirus, the largest geminivirus genus comprises more than 300 viral species, which can be associated with satellites of three types, i.e. alphasatellites, betasatellites or deltasatellites. Whereas alphasatellites and deltasatellites are mostly harmless, betasatellites often increase viral symptoms and reduce yields dramatically. Betasatellite, widely distributed in Asia, the Middle East, and Africa, are now reported at the Eastern and Southern doorstep of the Mediterranean Basin. Their spread to new producing areas is matter of concern because all begomovirus species tested so far can be helper of different betasatellites and particularly begomoviruses reported in the Mediterranean, i.e., tomato yellow leaf curl virus (TYLCV) and tomato leaf curl New Dehli virus. The recent invasion of betasatellites in TYLCV infected tomato crops of Israel and Jordan and the fact that the invaded betasatellite can overcome the previously selected plant resistance to TYLCV is an example of the disaster that threaten this region. Moreover, the intensive production of vegetables in this region with year round crops is thought to be conducive for their adaptation and maintenance in this new environment. The main objective of our project is to check the presence /absence of betasatellite in the western part of the Mediterranean Basin and identify the main drivers of their installation, their ecology and interactions with plants and geminiviruses
Actualización del estatus de las moscas blancas (Hemiptera: Aleyrodidae) en Jordania con énfasis en el complejo Bemisia tabaci
No full textWhiteflies are economically important plant pests that cause damage to crops worldwide. This study aimed to update the status of whiteflies in Jordan by combining the classical morphological identification and the DNA markers using the mitochondrial cytochrome oxidase I (mtCOI) gene. Over the course of three consecutive years, 111 whiteflies were collected from different geographical regions and different plant hosts in Jordan. The results showed that, in addition to Bemisia tabaci, another nine different whitefly species were identified, including two species that were recorded for the first time in Jordan: Africaleurodes coffeacola, and Tetraleurodes neemani. A special focus has been given to economically important plant pests like the B. tabaci species complex. Three different diagnostic techniques were used to identify B. tabaci putative species based on mtCOI gene. All the collected samples of B. tabaci species complex were identified as Middle East–Asia Minor 1 (MEAM1) putative species.Las moscas blancas son plagas de plantas de importancia económica, que causan daños a cultivos en todo el mundo. Este estudio tuvo como objetivo actualizar el estado de conocimiento sobre las moscas blancas en Jordania, combinando la identificación morfológica clásica y la tecnica del gen de citocromo oxidasa I mitocondrial (mtCOI) como un marcador de ADN. En el transcurso de tres años consecutivos se recolectaron 111 moscas blancas de diferentes regiones geográficas, y de diferentes plantas hospederas. Los resultados mostraron que, además de Bemisia tabaci, existen nueve especies diferentes de mosca blanca; incluso se registraron por primera vez en Jordania dos especies: Africaleurodes coffeacola y Tetraleurodesneemani. Se hizo especial énfasis en el complejo de especies de B. tabaci por su importancia económica. Se utilizaron tres técnicas de diagnóstico diferentes para identificar especies cercanas a B. tabaci basadas en el gen mtCOI. Sin embargo, todas las muestras recolectadas del complejo de especies de B. tabaci se identificaron como especies del complejo de Oriente Medio-Asia Menor 1 (MEAM1)
Betasatellites associated geminivirus diseases, a risk for vegetable crops in the Mediterranean area.
No full textInternational audienc
Betasatellites associated geminivirus diseases, a risk for vegetable crops in the Mediterranean area
No full textSource Agritrop Cirad (https://agritrop.cirad.fr/602567/)International audienceSome plant viruses are frequently associated with satellite molecules. Their infectious cycle depends on the so-called helper virus for replication, encapsidation, or transmission. Some of these molecules increase severity of viral symptoms and agronomic yield losses. Geminiviruses (family Geminiviridae) are among the most damaging viruses because they affect various important industrial and food crops including cotton, maize, cassava and vegetables crops (tomato, cucurbits). Begomovirus, the largest geminivirus genus comprises more than 300 viral species, which can be associated with satellites of three types, i.e. alphasatellites, betasatellites or deltasatellites. Whereas alphasatellites and deltasatellites are mostly harmless, betasatellites often increase viral symptoms and reduce yields dramatically. Betasatellite, widely distributed in Asia, the Middle East, and Africa, are now reported at the Eastern and Southern doorstep of the Mediterranean Basin. Their spread to new producing areas is matter of concern because all begomovirus species tested so far can be helper of different betasatellites and particularly begomoviruses reported in the Mediterranean, i.e., tomato yellow leaf curl virus (TYLCV) and tomato leaf curl New Dehli virus. The recent invasion of betasatellites in TYLCV infected tomato crops of Israel and Jordan and the fact that the invaded betasatellite can overcome the previously selected plant resistance to TYLCV is an example of the disaster that threaten this region. Moreover, the intensive production of vegetables in this region with year round crops is thought to be conducive for their adaptation and maintenance in this new environment. The main objective of our project is to check the presence /absence of betasatellite in the western part of the Mediterranean Basin and identify the main drivers of their installation, their ecology and interactions with plants and geminiviruses
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