Other GUS substrates?

[HAUSER MARIE-THERES]

Hello netters,
About one year ago I got an advertisment for other substractes for 
GUS which produced a red colour and others I can't remember 
anymore. 
My first question is: Do somebody know which company sells these 
substrates?
My second questions is: Can you use the substrates also for yeast 
and other systems than plants?
Thanks for the answers in advance
Marie-Theres Hauser