Exposing strains to UV light or chemical mutagens to trigger high-yielding mutations.

: Techniques for the long-term maintenance of culture purity and genetic stability. Key Industrial Applications

Despite this, the book remains relevant for —the physics of aeration, the chemistry of media preparation, and the logic of strain selection rarely change.

Methods for extracting and purifying the final product.

Ultimately, while a free PDF is a convenient tool, the true value lies in understanding the timeless principles Casida laid out—principles that continue to drive the biotechnology revolution today.