More accurately: "adjustable pin". Their *loops* are all adjustable
(as opposed to Mitegen or MDL).
Those pins are not very useful if your crystal is already mounted. And
once you've bent that pin, it can't be stored again, because robots and
tongs won't close around them.
They do have the advantage of not sometimes bending back, the way bent
loops do.
On 07/03/2012 07:56, Zhijie Li wrote:
Hampton sells an adjustable mounted loop for this purpose.
http://hamptonresearch.com/product_detail.aspx?cid=24&sid=136&pid=385
<wlmailhtml:%7B35C92305-260C-4820-B40D-05B0D91A0A8F%7Dmid://00000024/%21x-usc:http://hamptonresearch.com/product_detail.aspx?cid=24&sid=136&pid=385>
*From:* Frank von Delft <mailto:[email protected]>
*Sent:* Wednesday, March 07, 2012 1:26 AM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [ccp4bb] How to reduce no. of overlaps
You probably have to tilt your crystal, so that the long axis is
parallel to the beam. We do this routinely: cut a plastic pipette
tip to have a sharp point, then push the loop where it attaches to the
pin, to bend the crystal itself.
You have to identify from your diffraction whether the long axis is
pointing through the face or the edge of the loop. As it's P6,
chances are it's through the face, because long-axis P6 tends to make
flat hexagons which lie flush with the face. So you have to bend so
the face of the loop upwards.
You'll have to practice this first, though, so put up an empty loop.
Top tips:
* Don't breathe! You'll blow the cryostream away.
* Bend the loop towards (rather than away from) the rim edge of
the pin to which it's glued.
* Don't breathe!
* Practise practise practise.
Another thing: most in-house sources allow you to reduce divergence
of the beam. You lose intensity, but no matter, just expose longer.
That also improves overlap.
Cheers
phx
On 07/03/2012 04:56, Dipankar Manna wrote:
Dear Crystallographers,
I am working on a protein having SG P6, the cell parameters are a=
79, b= 79, c= 325. The crystals are forming in big size and with very
good shape. It also diffracting very well in Home source facility
both in terms of resolution and intensity. But the only problem is
the number of overlaps. Its showing much more than the good spots. As
a result the completeness is showing maximum up to 65% even after
collecting 180 degrees. I am unable to get a complete data. I tried
with reducing the oscillation angel to 0.3 degree/0.5 degree but it
did not improve that much. Please give me some suggestions.
Regards,
Dipankar
/Dipankar Manna/
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