LABORATORIUM VOOR TOEGEPASTE ENZYMOLOGIE EN RADIOBIOLOGIE Cae

No.

DER RUKS-UNIVERSITEIT TE LEIDEN ,
WASSENAARSEWEG 62, TEL. 01710-24441

LEIDEN, __danuary.15%) — , 962.

| STANFORD UNIV.—DEPT. GENETICS

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your request to Professor J.Lederberg,

Dr. Stocker Dept. of Genetics,

at the Lister Stanford University Medical Center,
Institute, London. Palo Alto. California.

as he has the U.S.A.

strain.

JH

Dear Professor Lederberg,

For several months last summer I worked under the
auspices of the U.S. - U.S.S.R. exchange of scientists
program as a guest in the laboratory of Prof.S.Bresler
in Leningrad. With one of his students I began a
project on tranformation of B.subtilis and the effects
of nitrous acid on this system.

The project has now been largely completed by
Bresler's young student, Daniel Perumov, and will be
the basis of his Carfidaat (our Ph.D.) thesis. However,
for final antitvation of his work he writes that he
now needs B.subtilis with linked markers and has
asked me to try to obtain such a strain for him.

I have checked here in the Netherlands where I am
currently working but cannot locate anyone who has
aquired such a strain from either your laboratory or from
Zamenhof's.

The high cotransfer index strain of B. subtilis,

SB 25 ind his, you have described in Proc .Nat.Acad.Scie,
47, 52 in your article with Dr. Nestor would of course
be ideal for Perumov's further work.

Would it be possible for you to have a sample of
this strain sent to me here in the Netherlands for
trarshipment to the Soviet Union? And because this
transshipment necessarily takes so long may I be so bold
as to suggest air mail rather than regular post?

Both I and my Russian colleagues will be greatly
obliged to you for this kindness.

With sincere thanks,

Jets ex

(Joseph Eigner)

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