TEMPERATURE - c Facultative either condition(Facultative...

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TEMPERATURE 1. All bacteria grow within temp. range; minimum maximum 2. Optimum - temp. of most rapid reproduction 3. Starting at minimum temp. growth slowly increases Reaches maximum rate at optimum. As temp. continues to rise growth rapidly decreases. 4. Bacteria divided into three groups according to growth temperature : a. Mesophiles - 20 ° C - 45 ° C (50 ° C) Ex. - environmental bacteria, pathogen b. Thermophiles - 45 ° C (50 ° ) - 80 ° C Extreme thermophiles (hyperthermophiles) - up to 110 ° C Ex. - hot springs, volcanoes in ocean, decomposers c. Psychrophiles - 0 ° C - 20 ° C Ex. - cold springs, lakes; polar regions; refrigerator. OXYGEN 1. Bacteria require oxygen for energy production 2. Bacteria can be divided into four groups based on requirement of gaseous oxygen: a. Aerobes - require the presence of gaseous (molecular) oxygen b. Anaerobes - require absence of gaseous oxygen (utilize O in oxygen containing compounds - chemical oxygen).
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Unformatted text preview: c. Facultative - either condition (Facultative anaerobes, facultative aerobes) d. Microaerophilic - require the presence of small amounts of oxygen (2% - 10%) - reduced oxygen tension e. Tubes of broth Brewer jar Candle jar pH 1. Concentration of H + , OH-ions 1 ----------------------------------- 7 ------------------------------14 Acid Neutral Basic 2. Bacteria grow within a pH range 3. Optimum pH - pH at which maximum growth occurs Divided into three groups according to pH range : a. Neutrophiles - 5 to 8 Optimum pH 7.0 - 7.2 b. Acidophiles - 0 to 5 1). Organisms used in fermentation reactions → acid (i.e. vinegar, dairy products) 2). Ex . pathogen: Helicobacter pylori- stomach ulcers c. Alkalinophiles - 8 to 12 Ex : Soil bacteria To culture in lab - add buffers to media to maintain pH. ....
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