YM (selective medium)

YM Agar and Broth, is a selective growth medium with low pH useful for cultivating yeasts, molds, or other acid-tolerant or acidophilic organisms, while deterring growth of most bacteria and other acid intolerant organisms.{{cite web|url=https://www.bd.com/europe/regulatory/Assets/IFU/Difco_BBL/271210.pdf|title=Xanthine Agar YM Agar • YM Broth|publisher=Becton, Dickinson and Company|access-date=2008-07-13}} It is malt extract medium modified by the addition of yeast extract and peptone.{{cite book|url=https://books.google.com/books?id=qidom58x_KkC&dq=Wickerham+YM+media&pg=PT93|title=Biodiversity and Ecophysiology of Yeasts: The Yeast Handbook |author=Carlos Rosa, Gábor Péter|access-date=2008-07-13|isbn=9783540261001 |date=2005-11-18 |publisher=Springer }}

The 'YM' of the name stands either for 'Yeast and Mold', or 'Yeast extract-Malt extract' depending on the source.

Variations include YMG agar/broth, which contains yeast, malt, and glucose.{{cite web|author1=|title=Yeast and Malt Extract with Glucose Agar Recipe|url=http://www.thelabrat.com/protocols/YMGagar.shtml|website=LabRat|publisher=theLabRat.com|access-date=23 February 2018|language=en|date=2005}}