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The news media's citations of journals, authors, and papers have been used avant la letre to study the impact of science in the lay press and some characteristics of scientific journalism. In this paper, the concepts of press citation and media impact are outlined by analogy to those of scientific citation and scientific impact, establishing their similarities and differences. Some possibilities of study using press citations counts are also outlined, as well as the development of new bibliometric indicators to measure the media impact of science. The analysis of press citations has advantages over alternative metrics (altmetrics) because the press is the main news producer and offers a more consolidated product with a professional filter. However, press citations also have some limitations, mainly the lack of a database of press citations from scientific journals in the international lay press. [ABSTRACT FROM AUTHOR]

A bibliometric analysis of research production in scientific journals, of the Scopus subject category Food Science, between 2003 and 2013, from seventy-one Spanish institutions with at least fifty works published, is presented. Statistical z tests are used for an evaluation of the degree to which an observed number of top-cited papers (top-10%) for an institution differs from the number expected, on the basis of randomness in the selection of papers. A map has been generated that displays inter-institutional collaboration networks; activity and impact values are displayed. The results show the most active institutions, located primarily in Madrid, Cataluña, Valencia, and Murcia, belong to the Spanish National Research Council (CSIC) and Catalonian research institutions. [ABSTRACT FROM AUTHOR]