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I have found two different abbreviations for the Michaelis constant: $K_\mathrm M$ with capital subscript M, and $K_\mathrm m$ with a regular m. Which form is better for use in an article to be published?

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closed as primarily opinion-based by A.K., Mithoron, Todd Minehardt, aventurin, DSVA Jul 1 '18 at 23:46

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Whatever form that the editors want. $\endgroup$ – MaxW Jun 30 '18 at 22:08
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    $\begingroup$ Many journals or scientific societies have a list of recommended abbreviations. $\endgroup$ – Karl Jul 1 '18 at 11:07
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In page 66 of the 2005 Green Book ("Quantities, Units and Symbols in Physical Chemistry"), IUPAC recommends that $K_\mathrm M$ be used as the symbol for the Michaelis constant. Note that $K$ should be italicised whereas $\mathrm{M}$ should not be italicised.

Thanks to Loong, who points out that the ACS Style Guide (Chapter 10, p 186) actually suggests $K_\mathrm m$. The Style Guide, however, also states that it is "not intended to be exclusive; alternative choices, in many cases, are acceptable".

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