Analytical instrumentation in the journals "Nature" and "Science" for 2001-2017. Webometric analysis

A webometric analysis of the journals Nature and Science for 2001-2017 was carried out. For each year selected 10 most cited articles. The number of links was determined by the Web of Science and Google Scholar. It was found that, of 170 articles, at least 85 are directly related to analytical instrumentation. The formal selection criterion was the presence in the article of the mention of any analytical instrument (for example, a sequencer). The dynamics of citing articles was also analyzed and an easily interpreted mathematical model of the citation process was proposed. The time dependence of the number of citations is adequately described by the product of the logistic dependence and a linearly decreasing function. The first factor is characteristic of any population process with restrictions. The second factor can be interpreted as the effect of the obsolescence of scientific information. The characteristic time interval for achieving zero citation for the group of publications in question is significantly less than for medium- and low-quoting articles in journals of the American Chemical Society