Descargar la presentación
La descarga está en progreso. Por favor, espere
Publicada porCelino Fernandez Modificado hace 9 años
1
Nutrición,Condiciones de Cultivo y Fases de Crecimiento
Temperatura: Psicrófilas: crecen óptimamente en temperaturas bajas < 20 grados C. Mesófilas: crecen óptimamente a temperatura ambiente > grados C Flora normal del cuerpo= comensales Termófilas: Crecen a temperaturas altas
2
pH Mayoría Bacterias patógenas: crecen en ambientes de Ph 6.5- 7.5.
Algunas toleran ambientes ácidos: flora gastrointestinal Otras como Vibrio cholerae crece en pH alcalinos.
3
Requisitos de oxígeno Aeróbicos Anaeróbicos facultativos
Microaerofílicos capneicosrequieren más CO2 que O2 Anaeróbicos estrictos: oxígeno es letal
4
Gas Pak System GasPak Plus® Hydrogen + CO2 with Safety- Shielded Integral Palladium Catalyst Strip For CO2-enriched anaerobic environment.
6
Enlace ?module=Book&func=displayarticle&art_id=7 5
10
http://www. monografias
14
Phases of Growth 4 Phases 1. Lag Phase 2. Log Phase
3. Stationary Phase 4. Death Phase
15
1. Lag Phase Bacteria are first introduced into an environment or media Bacteria are “checking out” their surroundings cells are very active metabolically # of cells changes very little 1 hour to several days
16
2. Log Phase Rapid cell growth (exponential growth)
population doubles every generation microbes are sensitive to adverse conditions antibiotics anti-microbial agents
17
3. Stationary Phase Death rate = rate of reproduction
cells begin to encounter environmental stress lack of nutrients lack of water not enough space metabolic wastes oxygen pH Endospores would form now
18
3. Stationary Phase Death rate = rate of reproduction
cells begin to encounter environmental stress lack of nutrients lack of water not enough space metabolic wastes oxygen pH Endospores would form now
19
4. Death Phase Death rate > rate of reproduction
Due to limiting factors in the environment
Presentaciones similares
© 2024 SlidePlayer.es Inc.
All rights reserved.