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Lab 3 - microorganism can effect the growth of another As...

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Heather Oslund 9-22-08 M 2-5 BME 2.106 Desk/ Locker #16 Lab 3: Selection and Differentiation Purpose To observe the effects of environmental conditions through microbial interactions, antibiotic sensitivity, oxygen tolerance and pH tolerance. To observe selection and differentiation through the use of varying mediums. Discussion This lab was valuable in showing how certain environmental conditions affect organisms and more importantly that these conditions can be used for selection and differentiation. The microbial interactions experiment showed how other species of
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Unformatted text preview: microorganism can effect the growth of another. As stated in the lab manual, the observed interactions are examples of commensalisms whereas the antibiotic sensitivity (if the antibiotic was produced directly by another organism near the test organism instead of on disks) would be considered antagonism. Ultimately these growth inhibitors or promoters can be valuable to select one organism out of many (selection). The MacConkey Agar plates adequately demonstrated selection and differentiation as I explained on page III-18....
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