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[Yeast] Yeast effected by dog food?

Eleanor Compton via yeast%40net.bio.net (by Els from w3z.co.uk)
Wed Nov 28 14:20:20 EST 2007

I wouldnt normally send emails to people i dont know out of the blue so im sorry, but i need help. 

I'm currently doing my biology AS coursework on the effects of certain substances on yeast respiration, using the breaking down of glucose for the reaction and dcpip indicater to see the rate of reaction.
I've used Iams dog biscuits with the ingredients 
Chicken, chicken by-product meal, corn meal, ground whole grain sorghum, ground whole grain barley, chicken meal, chicken fat (preserved with mixed tocopherols, a source of vitamin E, and citric acid), fish meal (source of fish oil), dried beet pulp (sugar removed), natural chicken flavor, dried egg product, brewers dried yeast, potassium chloride, salt, flax meal, choline chloride, ferrous sulfate, dicalcium phosphate, dl-methionine, zinc oxide, vitamin E supplement, ascorbic acid, manganese sulfate, copper sulfate, manganous oxide, vitamin A acetate, calcium pantothenate, biotin, rosemary extract, thiamine mononitrate (source of vitamin B1), vitamin B12 supplement, niacin, riboflavin supplement (source of vitamin B2), inositol, pyridoxine hydrochloride (source of vitamin B6), vitamin D3 supplement, potassium iodide, folic acid, cobalt carbonate 

When i did the experiment it slowed down the reaction of the dcpip indicater, but this doesnt nessercarly mean it was to do with yeast respiration.

Does anyone know if any of these ingredience effect the respiration of yeast or enzymes used in any way?

I'd be so greatful if anyone had any useful information,
>From eleanor.
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