First Advisor

Byron E. Lippert

Term of Graduation

Spring 1971

Date of Publication

5-24-1971

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Biology

Department

Biology

Language

English

Subjects

Algae, Plants -- Effect of antibiotics on

DOI

10.15760/etd.1450

Physical Description

1 online resource (v, 46 pages)

Abstract

The nature of the action of penicillin on the cell walls of bacteria is reviewed. The composition of bacterial cell walls is compared to cell walls of blue-green algae.

The test organisms used were thermophilic: Anacystis nidulans grew optimally at 35⁰C, whereas Synechococcus lividus grew best at 45⁰ C. Growth was recorded by reading optical densities.

Cells of these two thermophilic blue-green algae were treated with varying dosages of penicillin and streptomycin. Penicillin inhibited growth of Anacystis nidulans and Synechococcus lividus in concentrations of 3.0 µg/ml and 0.03 µg/ml respectively. However, when 0.3 µg/ml of penicillin was added to Anacystis nidulans, an initial lag phase of growth was observed. Possible reasons for this lag are suggested and results of pertinent experiments are discussed. No similar lag was noted in Synechococcus lividus.

Streptomycin inhibited growth of both species when present in 0.03 µg/ml.

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In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Persistent Identifier

https://archives.pdx.edu/ds/psu/10115

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