Microbial Growth
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Microbial Growth - Details
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32 questions
| 🇬🇧 | 🇬🇧 |
| 1.Lag Phase 2.Log Phase 3.Stationary phase 4.Death phase | Phases of Growth (4) |
| Death rate=death of reproduction. Cells begin to encounter environmental stress (endospores would form now) | Stationary phase |
| Lack of nutrients, water, space. Presence of metabolic waste. Oxygen and pH | Environmental stress conditions |
| PH, moisture content, oxidation-reduction potential, nutrient content, antimicrobial constituents, biological structures. | Factors affecting growth (8) |
| Most fresh foods Aw>0.99 | Moisture |
| Remove or bind water | Humectants |
| Thrive in high salt conditions | Halophilic bacteria |
| Tolerate high osmotic pressure | Moderate or facultative halophiles |
| Require high osmotic pressure | Extreme or obligate halophiles |
| -0.61. Can thrive in low Aw | Xerophilic moulds |
| -0.83 Adapts to high salinity | Halotolerant (haloduric) |
| 0.61 Adapted to high sugar or high salt conditions | - Osmophilic yeasts |
| Tolerant of high osmotic pressure | Osmotolerant |
| 0.86 | Lowest Aw for pathogen growth |
| Ease at which the substrate loses of gains electrons | Oxidation/reduction potential |
| Cold loving. 0C-20C | Psychrotrophs |
| Moderate temps. 20C-40C | Mesophile |
| Heat loving. 40C-100C | Thermophiles |
| Endure cold | Psychroduric |
| Endure heat | Thermoduric |
| Needs oxygen for growth | Obligate aerobe |
| Oxygen required at levels below 0.2atm | Microaerophile |
| Can’t grow in presences of oxygen | Obligate anaerobe |
| Oxygen not required for growth but will be utilised if available | Facultative anaerobe |
| Not required and not utilised | Aerotolerant anaerobe |
| Binary Fission | Growth and reproduction method |