In this audiophile review, I'm taking a deep dive into the Questyle Sigma DAC and Headphone Amplifier, a portable powerhouse priced competitively against top contenders like the Chord Mojo 2.

A versatile, professional-grade lens with superior light-gathering capability, though there's a compromise to be made in terms of weight. Chromatic aberration and coma are significantly corrected. Why ...

You have full access to this article via your institution. The initiation of bacterial transcription in E. coli serves as a model for transcription in Bacteria, Eukarya and Archaea. This is the first ...

Extracytoplasmic function (ECF) sigma factors constitute a large family of bacterial transcriptional regulators that direct transcription in response to various stresses and have different mechanisms ...