Physical Parameters for Bacterial Growth PDF
Document Details
SAGE University Bhopal
Ms. Mahima Borkar
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Summary
This document details physical parameters that affect bacterial growth, such as temperature, pH, oxygen, osmotic pressure, and light. It is suitable for undergraduate microbiology students.
Full Transcript
Physical parameters for bacterial growth Ms. Mahima Borkar Assistant Professor SAGE University Bhopal physical parameters for bacterial growth. 1. Temperature Psychrophiles: Thrive in cold environments (-20°C to 10°C). Mesophiles: Optim...
Physical parameters for bacterial growth Ms. Mahima Borkar Assistant Professor SAGE University Bhopal physical parameters for bacterial growth. 1. Temperature Psychrophiles: Thrive in cold environments (-20°C to 10°C). Mesophiles: Optimal growth between 20°C and 45°C; includes most human pathogens. Thermophiles: Grow best at higher temperatures (45°C to 80°C). Hyperthermophiles: Thrive in extremely hot environments (80°C to 121°C).. 2. pH Levels Acidophiles: Optimal growth at low pH (below 5.5). Neutrophiles: Grow best in neutral pH environments (pH 6.5-7.5). Alkaliphiles: Thrive in high pH environments (above 8.0). 3. Oxygen Requirements Obligate Aerobes: Require oxygen to grow. Obligate Anaerobes: Cannot survive in the presence of oxygen. Facultative Anaerobes: Can grow with or without oxygen. Microaerophiles: Require low oxygen levels. Aerotolerant Anaerobes: Do not require oxygen but are not harmed by it. 4. Osmotic Pressure Halophiles: Require high salt concentrations to grow. Osmotolerant Bacteria: Can survive in varying osmotic conditions. 5. Hydrostatic Pressure some bacteria, particularly deep-sea bacteria (barophiles), are adapted to survive under high-pressure conditions. 6. Light Some bacteria, like phototrophs, use light as an energy source. UV light can also inhibit or kill bacteria by damaging their DNA.
