Number Of Bibliographic References Research Articles

A evolução da citação na Revista Portuguesa de Medicina Geral e Familiar: de 2000-2008 para 2009-2015

Objetive: To measure the bibliographic citation of articles previously published in the Portuguese Journal of General Practice and compare these results with previous citation values. Study design: Observational, transversal and descriptive study. Place: Faculty of Medicine, University of Coimbra, Portugal. Population: All issues of the Portuguese Journal of General Practice published between 2009 and 2015 (including). Methods: Systematic review of the total number of bibliographic references, number of bibliographic references in articles published in Portugal and number of bibliographic references in articles published in this journal and available on its website. Comparison with previously published results. Results: Total references were 12.0±11.2 in published articles, 2.4±3.0 in articles published in Portuguese journals and 0.6±1.2 in articles published in this journal. The growth dynamics with respect to previous results are negative for the journal’s references (-33.3), for Portuguese references (-14.3), and for total references (-28.6). Conclusions: The citation values found are low and with negative growth dynamics in relation to those previously published.

The Impact of Article Length on the Number of Future Citations: A Bibliometric Analysis of General Medicine Journals

BackgroundThe number of citations received is considered an index of study quality and impact. We aimed to examine the factors associated with the number of citations of published articles, focusing on the article length.MethodsOriginal human studies published in the first trimester of 2006 in 5 major General Medicine journals were analyzed with regard to the number of authors and of author-affiliated institutions, title and abstract word count, article length (number of print pages), number of bibliographic references, study design, and 2006 journal impact factor (JIF). A multiple linear regression model was employed to identify the variables independently associated with the number of article citations received through January 2012.ResultsOn univariate analysis the JIF, number of authors, article length, study design (interventional/observational and prospective/retrospective), title and abstract word count, number of author-affiliated institutions, and number of references were all associated with the number of citations received. On multivariate analysis with the logarithm of citations as the dependent variable, only article length [regression coefficient: 14.64 (95% confidence intervals: (5.76–23.50)] and JIF [3.37 (1.80–4.948)] independently predicted the number of citations. The variance of citations explained by these parameters was 51.2%.ConclusionIn a sample of articles published in major General Medicine journals, in addition to journal impact factors, article length and number of authors independently predicted the number of citations. This may reflect a higher complexity level and quality of longer and multi-authored studies.

Cambios en las cartas al director publicadas en CIRUGÍA ESPAÑOLA entre 2000 y 2007

To describe the frequency and bibliographic characteristics of letters to the editor in the journal, Cirugía Española published between 2000 and 2007 and to compare the differences in the periods between 2000-2003 and 2004-2007. A descriptive and cross-sectional study, using the letters to the editor published in Spanish surgery between 2000 and 2007, as observation units. The variables considered were: the number of letters according to the volume and year of publication, substantive content of the paper, text length, graphics resources use, number of signatories and their professional profile, institutions of the authors, by origin and number of Autonomous Communities and number of bibliographical references. To meet the second objective, we compared letters from the period 2000-2003 with the period 2004-2007 against the rest of variables considered as a result. We used descriptive statistics and statistical analysis for comparison of distributions (chi2), with a level of significance of p < 0.05, using the SPSS software (Version 15.0). We identified 312 documents classified as letters. Between 2002 and 2005 their number was small. Often referring to clinical cases 187 (59.9%) and related letters, 98 (31.4%). Of those, 81.1% met the standard length of the text and only 6 letters (1.9%) was the use of graphics exceeded. In 122 letters (39.1%) the permitted number of authors was exceeded. They were mostly contributed by surgeons, 238 cases (76.3%), usually a single hospital, with 294 letters (94.2%) mainly from, Catalonia, Andalusia, Madrid and Valencia. Only 58.1% of the letters complied with the permitted number of references. More related letters were published in the last period (59 letters; 42.1%) than during the years 2000-2003 (39 letters; 22.7%) (chi2 = 14.79; p < 0.001). The correct length of the text improved in the second period, 136 (97.1%), compared to the first 117 (68%) (chi2 = 42.67; p < 0.001. The graphics resources were used properly in both periods. The number of signatories ranged between 1 and 5 in 51.2% of cases in the first period compared to 72.9% in the second (chi2 = 15.25; p < 0.001. In both periods analysed the professional profile of the signatories was similar. More than one institution was involved in 10% of the letters in the final period, compared to 2.3% in the first year period (chi2 = 8.36; p = 0.004). The adequacy of the number of permitted references was higher in the final period (87.1%) than in the initial (34.9%) (chi2 = 86.72; p < 0.001). The letters in Cirugía Española journal have regained their previous frequency after a period of stagnation between 2002 and 2005. In the final period of the study there was a marked improvement compared to the first one in most indicators studied.

Frecuencia y características de las cartas al director publicadas en Farmacia Hospitalaria (1995-2006)

To describe the frequency and bibliographical characteristics of letters to the editor published in the Farmacia Hospitalaria journal (hospital pharmacy) between 1995 and 2006. Descriptive and comprehensive study on documents classified as letters to the editor, which were published between 1995 and 2006. Using journal issues as a source, the following variables were identified: number of letters/year, main content, text length (words), language, use of graphs, number of authors and their professional experience, number of participating institutions, origin in terms of autonomous community, number of bibliographical references and their origin. Descriptive statistics were used. A total of 82 letters were identified, with a mean of 7 per year and 1.1 per journal. They were more frequent during the last two years, 43 (52%) of the total, following their practical non-existence between 1998 and 2003. The majority of the letters, 52 (63%), were regarding clinical cases while 23 (28%) were related to publications or were replies to the letters themselves. All letters met the requirements regarding text length, language and use of graphs. The mean number of authors was 3, and in 12 letters (14%) the limit on the number of authors was exceeded. In 56 cases (64%), the letters were written by hospital pharmacists only, however 26 (32%) were written in conjunction with hospital doctors. In 16 of the letters (20%), the authors belonged to one or more institutions. The letters mainly came from Valencia, Catalonia, Madrid and Andalusia. A total of 411 supporting references were gathered. The mean was 5 citations per letter to the editor, between 0 and 15 references, and in 17 cases (21%), the number of references was higher than the accepted limit. Of the total citations, 255 (60%) were from foreign publications. Letters to the editor in Farmacia Hospitalaria significantly increased during the last two years of the period studied and were practically non-existent before this. It is worth noting that many of the letters were written in collaboration with other health professionals and with the support of a number of institutions. It is compulsory that the letters meet publishing requirements, with the exception of a number of authors and references which were published without being thoroughly checked beforehand.

438 — Inverse voltammetry (stripping analysis) in the investigation of biologically important compounds

Some simple considerations concerning adsorption and electrochemical transformation at electrodes point to the possibility of applying these phenomena to analytical processes of biologically important substances, including mechanisms of electrode processes, structure, conformation, etc. Examples quoted include biopolymers, protiens, nucleosides, nucleotides, etc. A considerable number of bibliographic references are given concerning the substances investigated.

Inverse voltammetry (Stripping analysis) in the investigation of biologically important compounds

Abstract Some simple considerations concerning adsorption and electrochemical transformation at electrodes point to the possibility of applying these phenomena to analytical processes of biologically important substances, including mechanisms of electrode processes, structure, conformation, etc. Examples quoted include biopolymers, protiens, nucleosides, nucleotides, etc. A considerable number of bibliographic references are given concerning the substances investigated.