Importance and sources of nitrogen - Sharon Long (Stanford)

From a channel Lumen includes in full: Every sampled transcript is a scientist-delivered lecture or technique tutorial (NGS library prep, single-cell methods, fluorescence microscopy, the point spread function, immunology, membrane biology) with no hype, entertainment framing or clickbait. The titles are plainly descriptive course-style headings. The only borderline items are student group project presentations from a course, which are excluded by title pattern for rigor.