Overview of Anaerobic Bacteria - Infectious Diseases. Bacteria can be classified by their need and tolerance for O2: Facultative: Grow aerobically or anaerobically in the presence or absence of O2. Microaerophilic: Require a low O2 concentration (eg, 5%) and, for many, a high CO2 concentration (eg, 1. Obligate anaerobic: Are incapable of aerobic metabolism but are variably tolerant of O2. Obligate anaerobes replicate at sites with low oxidation- reduction potential (eg, necrotic, devascularized tissue).
Obligate anaerobes replicate at sites with low oxidation-reduction potential (eg, necrotic, devascularized tissue).
Oxygen is toxic to them. Obligate anaerobes have been categorized based on their O2 tolerance: Strict: Tolerate only . Many anaerobes produce tissue- destructive enzymes, as well as some of the most potent paralytic toxins known. Usually, multiple species of anaerobes are present in infected tissues; aerobes are frequently also present (mixed anaerobic infections). Clues to anaerobic infection include. Polymicrobial results on Gram stain or culture.
Gas in pus or infected tissues. Foul odor of pus or infected tissues. Necrotic infected tissues. Site of infection near mucosa where anaerobic microflora normally reside.
- Enzyme production by obligate intestinal anaerobic bacteria isolated from oscars (Astronotus ocellatus), angelfish (Pterophyllum scalare).
- Tween sleep-disordered breathing and metabolic dysfunc-tion. Metabolic syndrome (MetS), a cluster of risk factors. The energy that all obligate aerobes require for survival is derived from the reduction of molecular oxygen (O 2) by nutrients to yield carbon 2 2 2.
- Genetic, and metabolic identity of each microorganism. Life span measurements conducted in Saccharomyces cerevisiae, the first microbe to gain popularity as a model of.
- Chapter 32: Principles of Food Microbiology I. PRINCIPLES OF FOOD MICROBIOLOGY A. Food is an ecosystem in which microorganisms compete to metabolize the nutrients, making endproducts such as acids, alcohols and gas.
- The major groups of microorganisms based on their relationship to Eh for growth are aerobes, anaerobes, facultative aerobes, and microaerophiles.
Chapter 17 Metabolism .