I. Factors that Affect Growth A. •The requirements for microbial growth can be divided into two main categories: physical and nutritional. The factors can be generally classified as intrinsic and extrinsic factors. Most of the bacteria grow at neutral pH (60.5-7.5). Soil Moisture 2. Microorganisms show varying sensitivity to different types of factors. e.g., pH, water activity (a W ), oxidation-reduction potential (Eh), nutrient … Factors Influencing Growth ofMicroorganisms in Food Food Microbiologists must have through understanding of the factors which influence microbial growth The ability of microorganisms to grow or multiply in a … The activities of microorganisms are greatly affected by the chemical and physical conditions of their environments. Factors InfluencingGrowth ofMicroorganisms in Food 2. pH ; Moisture ; Nutrient Content ; Oxygen ; Light ; 3 pH. Nutrients needed by microorganisms include: Carbon carbon containing compounds are needed as an energy source (ex. Microbial Growth * * * * * * * * * * * * * * * * * * * * * * * * * * * * Growth of Microbes Increase in number of cells, not cell size One cell becomes colony of millions of cells Growth of Microbes Control of growth is important for infection control growth of industrial and biotech organisms Factors Regulating Growth Nutrients … Growth of microorganisms in food is dependent on various parameters. A variety of intrinsic and extrinsic factors determine whether microbial growth will preserve or spoil foods, as shown in Table 3.3. Chemical factors ... • Most bacteria grow well within the pH range of 6 - 9 b) alkaliphiles - prefer growth under alkaline conditions (pH 8.0 to 11.5) • many produce enzymes that work well at high pH – useful for the detergent industry The intrinsic and extrinsic factors affecting the growth of … The factors influencing the growth of microorganisms are physical, chemical and biological in nature. In most buildings, warmth and moisture are the biggest overall issues present. figure: pH vs growth rate glucose) for building … Food. Soil Organic Matter 4. Types of Vegetation and its Growth Stages 5. pH affects the ionic properties of bacterial cell so it affects the growth of bacteria. Factors Affecting Microbial Growth Food. Any change in the environmental pH may either enhance the enzyme activity or inhibit the activity (Table 19.2). Intrinsic or food related parameters are those parameters of plants and animal tissues which are inherent part of the tissue. Soil Moisture: Moisture is present in the form of film in soil pores. Microbial growth •The microbial growth is the increase in number of cells rather than in size of individual cells. Title: Factors affecting microbial growth 1 Factors affecting microbial growth 2 Factors affecting microbial growth. Different Seasons. Factors Affecting. Most spoilage bacteria grow best near neutral pH Pathogenic bacteria even more narrow in tolerance range of near neutral Yeast and moulds have much … relationship between pH and bacterial growth is given in figure below. Thus, pH can dramatically affect the growth of microorganisms. Dampness is a big player in the growth … However there are certain bacteria that grow best at acidic or basic pH. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure … Different organisms react to their environment in different ways. Organic and Inorganic Chemicals 3. The major external factors that influence the microbial community in soil are: 1. Factors Influencing Growth of Microorganisms in Food 1. Factor # 1. Each species of microorganisms shows specific pH growth … Factor acting deadly on Microbial Growth FATTOM Food Acid Temperature Time Oxygen Moisture Factors Affecting Microbial Growth. 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