We analysed the production, impact factor of, and scientific collaboration involved in viticulture and oenology articles associated with South African research centres published in international journals during the period 1990-2009. The articles under scrutiny were obtained from the Science Citation Index database, accessed via the Web of Knowledge platform. The search strategy employed specific viticulture and oenology terms and was restricted to the field 'topic'. The results showed that 406 articles were published during the review period, with the most number of publications being in the South African Journal of Enology and Viticulture (n = 34), American Journal of Enology and Viticulture (n = 16) and Journal of Agricultural and Food Chemistry (n = 16). The articles were published by 851 authors from 236 institutions. The collaboration rate was 3.7 authors per article, having grown over the two decades examined. The most productive institutions (i.e. those receiving a greater number of citations) were Stellenbosch University (219 published articles and 2592 citations) and the Agricultural Research Council (49 published articles and 454 citations), both from South Africa. Graphical representation of co-authorship networks identified 18 groups of authors and a single network of institutions whose core is Stellenbosch University. In conclusion, we have identified a significant growth in South African viticulture and oenology research in recent years, with a high degree of internationalisation and a constant level of domestic collaboration.

Objective: The aim of this study was to analyze patterns of scientific collaboration and the visibility generated by coauthorship of articles on smoking among different countries on a world-wide basis through the Science Citation Index-Expanded (SCI-expanded) from 1999 to 2003. Material and methods: We selected articles on smoking resulting from collaboration among different countries in the SCI-Expanded (1999-2003). The underlying networks of collaboration among countries were analyzed by comparing production (number of articles published), visibility (number of citations received) and centrality (node degree, intermediation and proximity). Results: A total of 3,484 articles were obtained, in which 5,008 institutions from 79 countries participated. The most productive country was the United Kingdom, with Germany and France in the second and third places. The United Kingdom also published the largest number of articles with inter-institutional collaboration (570 articles), with the USA and Germany in second and third places. The USA published the largest number of articles with international collaboration with the United Kingdom and France in the second and third places. All countries received a greater number of citations for articles resulting from international and inter-institutional collaboration than for those performed without collaboration. Networks of collaboration were completely connected through a single component and the annual increase in size of these inter-country networks was due to new countries joining the periphery of the network. Conclusions: We found a positive correlation between international and inter-institutional collaboration and the number of citations received by articles on smoking research. The number of citations per year remained constant throughout the 5-year study period.

Objetivo: El objetivo de este trabajo fue establecer los patrones de colaboración científica internacional y la visibilidad que genera la coautoría de artículos sobre tabaquismo en relación a países, a través del Science Citation Index-Expanded (SCI-Expanded) en el periodo de 1999 a 2003. Material y métodos: Se seleccionaron los artículos de colaboración sobre tabaquismo entre países en SCI-Expanded (1999-2003). Se analizaron las redes de colaboración subyacente entre países, comparando su productividad (número de artículos producidos), su visibilidad (número de citas recibidas) y centralidad (grado nodal, intermediación y proximidad). Resultados: Se recuperaron 3.484 artículos en los que habían participado 5.008 instituciones de 79 países. Reino Unido fue el más productivo, seguido de Alemania y Francia. Reino Unido fue, asimismo, el país que publicó más artículos (570) de colaboración interinstitucional, seguido de Estados Unidos y Alemania. Sin embargo, Estados Unidos fue el que publicó más artículos en colaboración internacional, seguido de Reino Unido y Francia. Todos los países recibieron más citas por sus artículos de colaboración interinstitucional o internacional que por los publicados sin ningún tipo de colaboración. Las redes de colaboración se encuentran completamente conectadas en un único componente, y el aumento que experimenta anualmente el tamaño de estas redes entre países se realiza a expensas de países nuevos en la periferia de la red. Conclusión: Existe una correlación positiva entre la colaboración internacional e interinstitucional y el número de citas que recibe un artículo. La citación de artículos se mantiene constante a lo largo del periodo analizado.

Objective: The aim of this study was to analyze patterns of scientific collaboration and the visibility generated by coauthorship of articles on smoking among different countries on a world-wide basis through the Science Citation Index-Expanded (SCI-expanded) from 1999 to 2003. Material and methods: We selected articles on smoking resulting from collaboration among different countries in the SCI-Expanded (1999-2003). The underlying networks of collaboration among countries were analyzed by comparing production (number of articles published), visibility (number of citations received) and centrality (node degree, intermediation and proximity). Results: A total of 3,484 articles were obtained, in which 5,008 institutions from 79 countries participated. The most productive country was the United Kingdom, with Germany and France in the second and third places. The United Kingdom also published the largest number of articles with inter-institutional collaboration (570 articles), with the USA and Germany in second and third places. The USA published the largest number of articles with international collaboration with the United Kingdom and France in the second and third places. All countries received a greater number of citations for articles resulting from international and inter-institutional collaboration than for those performed without collaboration. Networks of collaboration were completely connected through a single component and the annual increase in size of these inter-country networks was due to new countries joining the periphery of the network. Conclusions: We found a positive correlation between international and inter-institutional collaboration and the number of citations received by articles on smoking research. The number of citations per year remained constant throughout the 5-year study period.

Objetivo: El objetivo de este trabajo fue establecer los patrones de colaboración científica internacional y la visibilidad que genera la coautoría de artículos sobre tabaquismo en relación a países, a través del Science Citation Index-Expanded (SCI-Expanded) en el periodo de 1999 a 2003. Material y métodos: Se seleccionaron los artículos de colaboración sobre tabaquismo entre países en SCI-Expanded (1999-2003). Se analizaron las redes de colaboración subyacente entre países, comparando su productividad (número de artículos producidos), su visibilidad (número de citas recibidas) y centralidad (grado nodal, intermediación y proximidad). Resultados: Se recuperaron 3.484 artículos en los que habían participado 5.008 instituciones de 79 países. Reino Unido fue el más productivo, seguido de Alemania y Francia. Reino Unido fue, asimismo, el país que publicó más artículos (570) de colaboración interinstitucional, seguido de Estados Unidos y Alemania. Sin embargo, Estados Unidos fue el que publicó más artículos en colaboración internacional, seguido de Reino Unido y Francia. Todos los países recibieron más citas por sus artículos de colaboración interinstitucional o internacional que por los publicados sin ningún tipo de colaboración. Las redes de colaboración se encuentran completamente conectadas en un único componente, y el aumento que experimenta anualmente el tamaño de estas redes entre países se realiza a expensas de países nuevos en la periferia de la red. Conclusión: Existe una correlación positiva entre la colaboración internacional e interinstitucional y el número de citas que recibe un artículo. La citación de artículos se mantiene constante a lo largo del periodo analizado.