[ccp4bb]: Please teach about twinning

[Kunchithapadam Swaminathan <nathan@ima.org.sg>]

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Dear :

In connection with the twinning discussion, I am open to admit that many of
us are in the situation:

Everything you wanted to know about twinning but afraid to ask

Can some experienced and kind soul (including the program authors) post a
mini tutorial, with protocols, pointers and computer program steps, for:

1.  Symptoms of twinning (and details of the buzz words like twin factor,
merohedral and hemihedral twinning)
2.  Data collection, reduction and correction 
3.  Structure determination and refinement

Obviously, there is a fear if you realize that a crystal is twinned and
immediately we just throw the crystal away or pretend to do something, which
leads to nowhere.

With regards,
Swami
************************************************
Dr. Kunchithapadam SWAMINATHAN
Assistant Professor
Department of Biological Sciences
The National University of Singapore
Blk S3 # 04-06, Science Drive 3
Singapore 117543
Phone: (65) 6874 7932
Fax:   (65) 6779 2486
Email: dbsks@nus.edu.sg
http://www.dbs.nus.edu.sg/Staff/swami.htm

(and)

Senior Scientist
Institute of Molecular Agrobiology
The National University of Singapore
1 Research Link, Singapore 117604
Phone: (65) 6872 7408
Fax:   (65) 6872 7007
Email: nathan@ima.org.sg
http://research.ima.org.sg/research/struct_bio/swami/

Homephone: (65) 6278 6929
Handphone: (65) 9877 3780
************************************************