Jump to content

  • Log in with Facebook Log in with Twitter Log in with Windows Live Log In with Google      Sign In   
  • Create Account

Submit your paper to J Biol Methods today!
- - - - -


Quantum Sufficiat/Suffic

  • Please log in to reply
4 replies to this topic

#1 LabLackey



  • Active Members
  • Pip
  • 29 posts

Posted 06 February 2014 - 11:49 AM

Hello, everyone.


A friend and I were discussing the term 'quantum sufficit' or (incorrectly) 'quantum sufficient'.  We understand it to mean adding water to a concentrated stock solution in order to make sufficient working stock; e.g. when making 1.0 L of LB media, you do not add the necessary reagents to 1.0 L of water and mix, you would add it to, say, 750mL of water, mix and pH the solution, then add enough water to get up to 1.0 L.


Does anybody else use the term 'QS'?  I mentioned it today to some coworkers and nobody knew what it meant.


Thanks for your opinions!


[Edited for clarity.]

Edited by LabLackey, 06 February 2014 - 11:50 AM.

#2 bob1


    Thelymitra pulchella

  • Global Moderators
  • PipPipPipPipPipPipPipPipPipPip
  • 6,133 posts

Posted 06 February 2014 - 12:04 PM

I use it as an abbreviation in my lab book - I use it as you do - "make up to final volume"  and have never considered that it might have any other meaning.

#3 Ameya P

Ameya P

    Rervm Cognoscere Cavsas

  • Moderators
  • PipPipPipPipPipPipPipPipPipPip
  • 337 posts

Posted 07 February 2014 - 12:26 AM

I have seen it on medicines actually.  Didn't quite know what it meant, until today.


Thanks, LabLackey! 

NEW!!!! Your next dose of antibiotic - Sugar on CoffeeTableScience!!!! 

Image copyright: Adrian Koh SF.
Replication of this art is strictly prohibited without express permission of the artist

#4 Bio-Lad



  • Active Members
  • PipPipPipPipPip
  • 86 posts

Posted 22 June 2014 - 04:42 AM

I use QS when I'm writing protocols. I picked it up at a pharmaceutical company I used to work at, although I seem to recall my old grad school PI using it, too.

Try pLOT, the a free plasmid mapping tool!


#5 mdfenko


    an elder

  • Active Members
  • PipPipPipPipPipPipPipPipPipPip
  • 3,103 posts

Posted 23 June 2014 - 05:53 AM

i've seen it used in papers and instructions.

talent does what it can
genius does what it must
i do what i get paid to do

Home - About - Terms of Service - Privacy - Contact Us

©1999-2013 Protocol Online, All rights reserved.