Factors affecting growth of bacteria

Hey people out there.
This is my very first presentation which I'm sharing with you all.
hope whatever you are looking for you'll get it in there.
This presentation explains various factors that affect the growth of bacteria in environment.

1. FACTORS AFFECTING GROWTH OF BACTERIA BY: DIVYA BHARDWAJ SEMESTER 1 ST SESSION- 2017-2018 FOOD MICROBIOLOGY AND TOXICOLOGY

2. Microbial Growth

3. Growth of Microbes Increase in number of cells, not cell size One cell becomes colony of millions of cells

4. Control of growth is important for infection control growth of industrial and biotech organisms Growth of Microbes

5. OXYGEN REQUIREMENT TEMPERATURE REQUIREMENT pH OSMOTIC PRESSURE LIGHT WATER CARBON DIOXIDE FACTORS AFFECTING THE GROWTH OF BACTERIA ARE :

6. ON THE BASIS OF OXYGEN REQUIREMENT, BACTERIA ARE DIVIDED INTO 4 GROUPS : STRICT AEROBES STRICT ANAEROBES FACULTATIVE ANAEROBES MICROAEROPHILIC 1: OXYGEN REQUIREMENT

7. (A) STRICT AEROBES : BACTERIA GROWS ONLY IN PRESENCE OF OXYGEN. EXAMPLE: PSEUDOMONAS STRICT ANAEROBES: BACTERIA GROWS ONLY IN THE ABSENCE OF OXYGEN. EXAMPLE : CLOSTIDIUM FACULTATIVE ANAEROBES : BACTERIA WHICH CAN GROW IN PRESSENCE AS WELL AS IN ABSENCE OF OXYGEN. EXAMPLE: CHOLERA VIBRIO MICROAEROPHILIC: BACTERIA CAN GROW IN LITTLE AMOUNT OF OXYGEN. EXAMPLE : STREPTOCOCCUS

8. IN OUR BODY: THE AEROBIC PLACES ARE : SKIN , EYE , MOUTH , THROAT , NOSE. THE ANAEROBIC PLACES ARE : DEEP IN TISSUES , LARGE INTESTINE. THE MICROAEROBIC PLACES ARE : UPPER PART OF STOMACH

9. BACTERIA ARE DIVIDED INTO 3 GROUPS ACCORDING TO TEMPERATURE REQUIREMENT: PSYCHROPILLIC : GROWS IN COLD TEMPERATURE i.e. TEMPERATURE BETWEEN 4-10 DEGREE CELCIUS. MESOPHILLIC : GROWS IN MODERATE TEMPERATURE i.e. TEMPERATURE BETWEEN 15-45 DEGREE CELCIUS. THERMOPHILIC : GROWS AT HIGH TEMPERATURE i.e. TEMPERATURE BETWEEN 45-90DEGREE CELCIUS . Each has a minimum, optimum, and maximum growth temperature 2: TEMPERATURE REQUIREMENT

10. Fig. 7.8

11. ON THE BASIS OF pH , BACTERIA ARE OF 3 TYPES: SOME GROW IN ACIDIC MEDIUM KNOWN AS ACIDOPHILLIC . PH BETWEEN 3-6. SOME GROWS IN BASIC OR ALKALINE MEDIUM KNOWN AS BASOPHILLIC OR ALKELOPHILLIC . PH BETWEEN 8-10. MOST BACTERIA GROWS IN NEUTRAL PH i.e. 7 KNOWN AS NEUTROPHILES . pH

12. BACTERIA VARIES IN THEIR SALT TOLERANCE : SOME CANNOT TOLERATE HIGH CONCENTRATION OF SALT. SOME CAN TOLERATE MEDIUM CONCENTRATION OF SALT. SOME CAN TOLERATE HIGH CONCENTRATION OF SALT KNOWN AS HALOPHILES . 4: OSMOTIC PRESSURE

13. BACTERIA PREFER TO GROW IN DARKNESS . PHOTOCHROMOGENIC MYCOBACTERIUM PRODUCES PIGMENT WHEN INCUBATED IN LIGHT . PATHOGENIC BACTERIA, DONOT REQUIRE LIGHT TO SURVIVE, BUT CAN BE DESTROYED BY UV LIGHT. PHOTOSYNTHETIC BACTERIA ARE COMPROSED OF GREEN AND PURPLE BACTERIA, AND USE LIGHT TO PHOTOSYNTHESIZED THEIR FOOD.THIS TYPE OF ORGANISM LIVES IN THE ENVIRONMENT, PRIMARILY WATER. 5: LIGHT

14. WATER IS ONE OF THE MOST ESSENTIAL REQUIREMENTS FOR LIFE.THUS , ITS AVAILABILITY BECOMES MOST IMPORTANT FACTOR FOR GROWTH OF MICROORGANISMS. MOISTURE IS AN ESSENTIAL REQUIREMENT FOR PHYSICAL GROWTH AS 80% OF MOISTURE IS REQUIRED GFOR GROWTH. 6: WATER

15. SMALL AMOUNT OF CO2 IS REQUIRED BY ALL BACTERIA WHICH IS USUALLY MADE AVAILABLE ENDOGENEOUSLY AS A RESULT OF CELLULAR METABOLISIM OR BY THE CO2 PRESENT IN THE ATMOSPHERE. 7: CARBON DI OXIDE

16. THANK YOU