Extracytoplasmic function (ECF) sigma factors are a distinct subset of sigma factors that enable bacteria to respond robustly to a myriad of environmental challenges. By directing RNA polymerase to ...

The meaning of Sigma in statistical analysis is a function of whether you use the upper or lower case of the letter. The ...

Evaluating a unique, niche lens such as the Sigma 15mm f/1.4 DG DN Art Diagonal Fisheye can be a tricky task, with aspects that might be considered flaws viewed instead as an intentional and desirable ...