Sp09MicroLab3SelectionDifferentiation

Sp09MicroLab3SelectionDifferentiation - observed...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
University of Texas at Austin BIO126L Course Instructor: Pratibha Saxena Spring 2009 Lab 3: Selection and Differentiation Purpose To observe the effects of environmental conditions on the growth of microbial organisms, through organism 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 microorganism can effect the growth of another. As stated in the lab manual, the
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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, also, adequately demonstrated selection due to the presence of crystal violet and bile salts, which select against gram positive organisms. It also differentiates which organisms ferment lactose because it contains neutral red....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern