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Bacterial toxins — Bacterial Toxins: Introduction and Differences between Exotoxins and Endotoxins
Exotoxins and endotoxins of bacterial toxins Bacterial toxins are of two types...

Colony Morphology of Bacteria: Introduction, Types and Special Features of Bacteria
Introduction of Colony morphology Colony morphology of bacteria is the most common...

Oxidative-Fermentative (OF) Test determines if certain gram-negative bacilli metabolize glucose by fermentation or aerobic respiration (oxidatively). During the anaerobic process of fermentation, pyruvate is converted to a variety of mixed acids depending on the type of fermentation. The high concentration of acid produced during fermentation will turn the indicator, bromthymol blue present in OF basal medium from green to yellow in the presence(oxidatively) or absence of oxygen (fermentatively) .Some nonfermenting gram-negative bacteria metabolize glucose using aerobic respiration and therefore only produce a small amount of weak acids during glycolysis and Krebs cycle. The decrease amount of peptone and increase amount of glucose helps the detection of weak acids so produced. Dipotassium phosphate buffer present in the medium is useful to further promote acid detection. It is also useful to test nonsacchrolytic (have no ability to use the carbohydrate in the media) activities of organisms. — Oxidative Fermentative (OF) Test: Introduction, Principle, Procedure ,Results Interpretation and Limitations
Introduction of Oxidative Fermentative Test OF stands for Oxidative Fermentative test. The...

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Klebsiella aerogenes : Introduction, Morphology, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes | Lactococcus garvieae: Introduction, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes | Dalmau Plate Culture: Introduction, Purpose and Mechanism, Procedure, and Key Morphological Identifiers | Rothia kristinae: Introduction, Pathogenicity, Lab Diagnosis, Treatment, Prevention, and Keynotes | Cord Factor: Introduction, Clinical Significance, and Keynotes