SNIP measures contextual citation impact by weighting citations based on the total number of citations in a subject field.
SJR is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and a qualitative measure of the journal’s impact.
The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
© Thomson Reuters Journal Citation Reports 2015
To calculate the five year Impact Factor, citations are counted in 2014 to the previous five years and divided by the source items published in the previous five years.
© Journal Citation Reports 2015, Published by Thomson Reuters
Life Sciences is an international journal publishing articles that emphasize the molecular, cellular, and functional basis of therapy. The journal emphasizes the understanding of mechanism that is relevant to all aspects of human disease and translation to patients. All articles are rigorously reviewed.
The Journal favors publication of full-length papers where modern scientific technologies are used to explain molecular, cellular and physiological mechanisms. Articles that merely report observations are rarely accepted. Recommendations from the Declaration of Helsinki or NIH guidelines for care and use of laboratory animals must be adhered to. Articles should be written at a level accessible to readers who are non-specialists in the topic of the article themselves, but who are interested in the research. The Journal welcomes reviews on topics of wide interest to investigators in the life sciences. We particularly encourage submission of brief, focused reviews containing high-quality artwork and require the use of mechanistic summary diagrams.
Manuscripts should present novel preclinical findings addressing questions of biological significance to human disease. Studies that fail to do so may be rejected without review. Quantitative conclusions must be based on truly quantitative methods. Life Sciences does not publish work on the actions of biological extracts of unknown chemical composition. Compounds studied must be of known chemical structure and concentration. The study must be reproducible; materials used must be available to other researchers so they can repeat the experiment. Clinical studies may be considered if they expand understanding of mechanism, but the journal does not encourage clinical trial reports.
Four common reasons for rejection include: out of scope (the manuscript does not conform to the goal of identification of mechanisms related to therapy for human disease); too preliminary (manuscript is based on a limited amount of experimental data diminishing significance); lack of novelty (manuscript is well done but does not address a significant question); unidentified structure (actions of biological extracts of unknown chemical composition).