need help-mysterious problem

[Philipp Pagel]

> I loaded for example 8 wells of the ten available.
> After this I stained the gel with Sypro Orange (and took a photo) in order
> to see if I have the same loading in each well (20 ug total proteins/ well).
> Each time the 2-3 central lanes are straight but the lateral lanes are
> curved toward the sides (convex look).

Your gel is smiling at you! ;-)

Two common reasons:
	- differences in salt concentration among the different lanes or
	  just high salt concentration of all samples
	- temperature differences along the gel

For the first problem try a different extraction buffer or dialyse the
salt out. It also helps to load the empty wells with a dummy sample
(extraction buffer + loading buffer).

If for some reason you have temperature problems you can try to run the
gel with a stirbar in the tank and put it on a stir-plate. Or keep
mixing the buffer with a pump.

cu
	Philipp

-- 
Dr. Philipp Pagel                                Tel.  +49-89-3187-3675
Institute for Bioinformatics / MIPS              Fax.  +49-89-3187-3585
GSF - National Research Center for Environment and Health
Ingolstaedter Landstrasse 1
85764 Neuherberg
Germany