polk at molbiol.ox.ac.uk polk at molbiol.ox.ac.uk
Thu Mar 31 11:22:43 EST 1994

In article <1994Mar31.153500.1 at molbiol.ox.ac.uk>, polk at molbiol.ox.ac.uk writes:
> In article <1994Mar31.123756.460 at chmeds.ac.nz>, mkennedy at chmeds.ac.nz (Martin Kennedy) writes:
>> In article <2n2ha1$39c at quartz.ucs.ualberta.ca>, asimmond at gpu.srv.ualberta.ca (Andrew Simmonds) writes:
>>> I am sure this has been covered before....
>>> I am having trouble getting TIGHT bands with Northern blots from 
>>> formaldehyde RNA gels...  When I cut off the ladder from the gel and look 
>>> at it sideways the bands are "tilted" i.e. ( / )  and I am sure this is a 
>>> problem when I transfer the RNA to a membrane causing the wide bands I am 
>>> seeing.  I put 2.2M formaldehyde in the gel and use a standards MOPS 
>>> buffer...
>>> Might anybody suggest a better way?
>>> Andrew Simmonds
> Martin Kennedy replied
>> I seem to remember someone round here having the same problem, due to
>> formaldehyde diffusing out of the gel...... etc
 Hi there,
 See Biotechniques vol 14;380-381
 ie put formaldehyde in the buffer (note 0.22 M final conc in gel and buffer).
 Hope this helps.....it improved resolution for me.
 regards from ianP
 Ian Polkinghorne                        SIG: If I can now see a little further
 NERC Institute of Virology                   it's only because my glasses were
 and Environmental Microbiology               cleaned for me... ANON
 Mansfield Rd, Oxford  UK
 polk at molbiol.ox.ac.uk

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