What does "S" stand for in s30 cell extract ?

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Adam B Shapiro

I believe it means supernatant, as in the supernatant of 30,000 x g centrifugation.

Manesh Nautiyal

Thanks Adam. There are lot of articles are available online for the preparation of s30 cell extract. Could you suggest me some authentic ones for small scale preparation of s30 cell extract?

Ho Leung Ng

Svedberg, a unit for sedimentation rate.

Thanks Ho.

https://en.wikipedia.org/wiki/Svedberg

A procedure for S30 extract preparation from E. coli is in this paper:

http://jb.asm.org/content/194/20/5504.long