Abstract
Qualitative and quantitative variations in the production of heteroglucans by three different species of Azotobacteriaceae in the presence of certain antibiotics (penicillin, tetracycline, and polymyxin B) were investigated. The authors found that these substances were produced at a slower rate and in smaller amounts when antibiotics were present. However, study by infrared spectrometry, chromatography, and colorimetry revealed that the most striking changes were qualitative and were caused by the hexuronic acids.
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