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The Joshua Lederberg Papers

Title:
Letter from Joshua Lederberg to Barbara J. Bachmann pdf (125,676 Bytes) transcript of pdf
Letter from Joshua Lederberg to Barbara J. Bachmann
Description:
Item is handwritten. Item is a photocopy.
Number of Image Pages:
2 (125,676 Bytes)
Date:
1993-06-15 (June 15, 1993)
Creator:
Lederberg, Joshua
Recipient:
Bachmann, Barbara J.
Rights:
This item is in the public domain. It may be used without permission.
Relation:
Lederberg Grouping: Correspondence F
Box Number: 39
Folder Number: 62a
Unique Identifier:
BBAQAZ
Accession Number:
78
Document Type:
Letters (correspondence)
Language:
English
Format:
application/pdf
image/tif
Physical Condition:
Good
Series: Correspondence, 1935-2002
SubSeries: 1985-1999
Folder: Bachmann, Barbara J.
Transcript:
[stamped, Professor Joshua Lederberg
The Rockefeller University
New York, N Y 10021-6399]
[stamped, JUN 15 1993]
Dear Barbara --
Unscrambling "K-12"s.
I've gone through a number of notes and other sources and I don't have anything more to contribute than what I sent you. I presume the labels on my own cultures would have had some further distinctions but I don't have those.
There is an outside chance that "K-12" acquisitions were given distinctive W-strain numbers but if so I haven't found that.
F. Orskov in Copenhagen may have more old strains; and perhaps Charlie Yanofsky at Stanford can trace Clifton's cultures.
Strains in the 58- and 679- auxotrophic series would have been subcloned out of Clifton's K12 by Ed Tatum in 1944.
As you know my active involvement with K-12 cultures ended roughly 1959. until restarted in 1990.
Yours
Josh.
[END PAGE ONE]
[BEGIN PAGE TWO]
As I go through my notes I am reminded that I had very little occasion to use "K-12" per se. Almost all our experiments used auxotrophs in Ed Tatum's 58- and 679- lineage.
Exception: W1244 is a "K-12" selected for azide-resistance 11/10/49.
That date would precede the imports mentioned by Larry Morse. Do you have it?
W1485 equals "K12" lambda-sensitive. but that's later. October 1950.
J.
Metadata Last Modified Date:
2007-01-12
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