Descriptive and empirical sciences, such as History, are the sciences that collect, observe describe phenomena in order to explain them draw interpretative conclusions about influences, driving forces impacts under given circumstances. Spreadsheet software relational database management systems still dominant tools for quantitative analysis overall data these allowing researchers directly analy...

A promoterless chloramphenicol acetyltransferase gene (cat) was used to construct recA-cat operon fusions to quantitatively examine the transcriptional regulation of the Pseudomonas aeruginosa recA gene in P. aeruginosa PAO. Wild-type P. aeruginosa containing the recA8-cat fusion was treated with methyl methanesulfonate (MMS) and showed immediate induction of chloramphenicol acetyltransferase (...