I'm reading a paper about yeast culture and in the methods, it says:

Then $5$ ml of sterile $M/15\ KH_2PO_4$, was added to the slant,

What is the meaning of $M/15$?

  • $\begingroup$ Can you add the paper itself? or a screenshot of the relevant section? $\endgroup$ – Ashafix Mar 10 '19 at 21:06
  • $\begingroup$ The only interpretation I can think of is a concentration of (1/15) M, i.e. 67 mM. But I've never seen anyone write it this way. $\endgroup$ – Victor Chubukov Mar 11 '19 at 2:36
  • $\begingroup$ @VictorChubukov That's what I thought, thanks $\endgroup$ – libby Mar 11 '19 at 2:49
  • $\begingroup$ @VictorChubukov. That's what it is. I just verified. I don't know much about the history of that though but it is an old notation that is no longer used. Can you please post an answer? $\endgroup$ – WYSIWYG Mar 11 '19 at 14:35

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