HI All--

You can also check out:

Icon isotopes (various salts, etc.): http://www.iconisotopes.com/
Isotec (SigmaAldrich, "sulfur metal"): 
http://www.sigmaaldrich.com/Area_of_Interest/Chemistry/Stable_Isotopes__ISOTEC_.html

and don't forget the Isogeochem webpage (suppliers):
http://www.eeb.cornell.edu/isogeochem/Stable%20Isotope%20Suppliers.htm

take care

gerry

Matheus Carvalho wrote:
> You could try to talk to these people, they seem to
> produce labeled gypsum:
>
> http://www.cena.usp.br/labs/labisoestav.htm
>
> The site is in Portuguese, though.
>
> Regards,
>
> Matheus
>
>
> --- Stephen MacAvoy <[log in to unmask]> escreveu:
>
>   
>> Greetings Isotopers,
>>
>> I'm planning a "pulse-chase" experiment with stable
>> sulfur isotopes and was wondering if anyone knew a
>> place to purchase 34S labeled cysteine or
>> methionine? or perhaps labeled sulfate minerals
>> (gypsum)?  
>>
>> I'm interested in labeling microbes living on leaves
>> in an aquatic environment, then feeding the 34-S
>> enriched (hopefully) to grazers.
>>
>> I could do this just using natural abundance, but am
>> exploring the alternatives.
>>
>> Any ideas would be much appreciated!
>>
>> Thanks
>>
>> Steve MacAvoy
>>
>>
>>
>>     
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