We present a new approach to study the structure of the impact factor of academic journals. This new method is based on calculation
of the fraction of citations that contribute to the impact factor of a given journal that come from citing documents in which
at least one of the authors is a member of the cited journal's editorial board. We studied the structure of three annual impact
factors of 54 journals included in the groups “Education and Educational Research” and “Psychology, Educational” of the Social
Sciences Citation Index. The percentage of citations from papers authored by editorial board members ranged from 0% to 61%.
In 12 journals, for at least one of the years analysed, 50% or more of the citations that contributed to the impact factor
were from documents published in the journal itself. Given that editorial board members are considered to be among the most
prestigious scientists, we suggest that citations from papers authored by editorial board members should be given particular
Despite increasing interest in the bacterium, the methodology for Clostridium difficile recovery has not yet been standardized. Cycloserine–cefoxitin fructose taurocholate (CCFT) has historically been the most used medium for C. difficile isolation from human, animal, environmental, and food samples, and presumptive identification is usually based on colony morphologies. However, CCFT is not totally selective. This study describes the recovery of 24 bacteria species belonging to 10 different genera other than C. difficile, present in the environment and foods of a retirement establishment that were not inhibited in the C. difficile selective medium. These findings provide insight for further environmental and food studies as well as for the isolation of C. difficile on supplemented CCFT.