iron oxide and yeast growth

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echinococcosis
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Joined: Thu Jan 25, 2007 11:43 pm

iron oxide and yeast growth

Post by echinococcosis » Thu Jan 25, 2007 11:52 pm

i just finished doing a lab about the effects of iron (III) oxide on the growth of yeast. i measured the respiration of the yeast (i attached balloons to the top of flasks), as well as the amount of foam they produced. after 3 hours, the yeast with no iron oxide added filled the balloon with the most air but the yeast with the most iron (20g) had the most foam. what would be a possible scientific explaination for these results? i don't understand why iron would cause more foam but less respiration overall.

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