Answer
Sterilizing liquids was made possible by Zsigmondy's filters, which played a pivotal role in the advancement of microbiology. These filters, crafted from collodion, provided a means to remove bacteria and other microorganisms from liquids, thereby enabling the isolation and study of specific microorganisms. This breakthrough significantly contributed to the understanding of microbiology and paved the way for advancements in fields such as medicine and biotechnology.