If you continue browsing the site, you agree to the use of cookies on this website. INTRINSIC FACTORS : OXIDATION- REDUCTION POTENTIAL OR REDOX POTENTIAL The growth of microorganisms in food differs if the growth medium will act as electron donor or electron receptor. Factors Affecting Microbial Growth advantix | Factors Affecting Microbial Growth. We discussed the nutrient requirements of microorganisms. Presented By : In general, there are two factors affecting plant growth and development : genetic and environmental. View Lecture Slides - 6-16 Factors_Affecting_Microbial_growth.ppt from BIO 150 at Wichita State University. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Factors affecting microbial growth. Factors Affecting Microbial Growth Food. Temperatures below the minimum stop bacterial growth … Factor of relative humidity. Different organisms react to their environment in different ways. Use the terms that describe a microbe’s growth range or requirement for each of the factors that influence microbial growth 2. The PowerPoint PPT presentation: "Factors affecting microbial growth" is the property of its rightful owner. FACTORS AFFECTING PLANT GROWTH Plant growth factors control or influence plant characteristics as well as adaptation. If you continue browsing the site, you agree to the use of cookies on this website. APIdays Paris 2019 - Innovation @ scale, APIs as Digital Factories' New Machi... Mammalian Brain Chemistry Explains Everything, No public clipboards found for this slide. Do you have PowerPoint slides to share? pH ; Moisture ; Nutrient Content ; Oxygen ; Light ; 3 pH. Oxygen requirement. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure •Moisture •Radiation •Oxygen concentration Nutritional factors … See our Privacy Policy and User Agreement for details. 3. Temperature range – growth does not occur above the maximum or below the minimum. Bacteria by virtue of mechanical strength of their cell wall are able to withstand a wide range of external osmotic variations. Growth An orderly increase in the quantity of all the cellular constituents. Biology 120 lectures for 2nd exam 2012 2012 (part 1 microbial growth), Lect. Most fresh foods, such as fresh meat, vegetables, and fruits, have a w values that are close to the optimum growth level of most microorganisms (0.97 to 0.99). Factors Affecting Microbial Growth Control of Microbial Growth: Introduction Early glucose) for building blocks. Factors Affecting The Growth Of Microbes. Antimicrobial constituents •The microbial growth is the increase in number of cells rather than in size of individual cells. As the following section shows, growth may be profoundly affected by a number of physical factors. Bacteria grow only in the presence of oxygen, called: strict aerobes. I-Semester. Factors Affecting Bacterial Growth Ksu PPT Presentation Summary : The effect to which salt concentration causes changes in bacterial growth depends on the osmotic balance required for such growth. Food. Temperature 3. pH 4. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Microbial Growth FATTOM Food Acid Temperature Time Oxygen Moisture Factors Affecting Microbial Growth. Temperature 2. Somewhere between these maximum and minimum points lies the optimum temperature at which the bacteria grow best. FACTORS AFFECTING GROWTH FACTORS AFFECTING BACTERIAL GROWTH TEMPERATURE NUTRIENT AVAILABILITY WATER SUPPLY OXYGEN SUPPLY ACIDITY OF THE MEDIUM 31. Factor # 1. Osmotic pressure (salt tolerance). It can be : Essential – when growth does not occur in their absence. Thus, its availability becomes most important factor for the growth of microorganisms. Presentation Summary : Factors affecting the growth of microbes. Physical factors- Temperature, pH, osmotic pressure, hydrostatic pressure and radiation. Now customize the name of a clipboard to store your clips. When microorganisms grow in food, they cause varying degrees of change in the food's characteristics as a result of metabolic activity. See our User Agreement and Privacy Policy. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure •Moisture Microbial Growth FATTOM Food Acid Temperature Time Oxygen Moisture Factors Affecting Microbial Growth. Factors Affecting. The key to a productive staff is creating and maintaining a safe and healthy work environment. 3. The growth of microorganisms is a highly complex and coordinated process, ultimately expressed by increase in cell number or cell mass. The chemicals are very important for microorganisms as these provide nutrition for growth, activity and survival of microorganisms in ecologically deficient niches in soil. Dr. Ruchi Seth If so, share your PPT presentation slides online with PowerShow.com. 2. Factors affecting microbial growth in food • Intrinsic Factors • Environmental Factors • Implicit Factors • Processing Factors . Department of Biotechnology Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Factors Affecting the Growth of Microorganisms in Foods . Micro-organism has an absolute demand for water, however, the exact amount of water needed for growth of microorganisms varies.This parameter helps us to understand the movement of water from the environment to the cytoplasm or from cytoplasm to the environment.The water requirement of microorganisms is expressed in physical form, called water activity(a w). Some bacteria require a high Title: Factors affecting microbial growth 1 Factors affecting microbial growth 2 Factors affecting microbial growth. Intrinsic parameter: Inherent or natural characteristics of food that affects growth of microbes in it are called intrinsic parameter of food. Growth Factors • Some microbes have the enzymes and biochemical pathways needed to synthesize all cellular components using minerals and sources of energy, carbon, nitrogen, phosphorus and sulfur. Most fresh foods, such as fresh meat, vegetables, and fruits, have a w values that are close to the optimum growth level of most microorganisms (0.97 to 0.99). Microorganisms show varying sensitivity to different types of factors. Factors Affecting Bacterial Growth Temperature Atmosphere – O2 & CO2 H-ion concentration Moisture & drying Osmotic effects Radiation Mechanical & sonic stress. Temperature Vary in their temperature requirements. … Now customize the name of a clipboard to store your clips. Nitrogen needed for amino acids and nucleotides; some can synthesize … Purpose: to observe the affect that different temperatures have on the growth of microorganisms. for growth depending on other growth factors in their environments. Most spoilage bacteria grow best near neutral pH Pathogenic bacteria even more narrow in tolerance range of near neutral Yeast and moulds have much greater tolerance to acidic (lower) pH ; 4 One indicator of microbial response is their taxonomic classification. Factors Affecting Microbial Growth Food. Water activity / moisture content . Solutes and Water Acidity: Water is one of the most essential requirements for life. There are various physical factors and biological factors that affect the growth of microorganisms. Guided by: Assuming these are present in an adequate supply, what other factors do we need to consider in order to provide favourable conditions for microbial growth? Factor Of Relative Humidity. Temperature Theoretically, bacteria can grow at all temperatures between the freezing point of water and the temperature at which protein or protoplasm coagulates. The most important physical factors are pH, temperature, oxygen, pressure, and salinity. 3. pH: pH affects the ionic properties of bacterial cell so it affects the growth of bacteria. Redox potential. Solutes and Water Acidity 2. Growth Factors Some bacteria require certain organic compounds in minute quantities – Growth Factors OR Bacterial Vitamins. The factors are: 1. Factors on Growth • Most organisms grow in fairly moderate environmental conditions • Extremophiles –grow under harsh conditions that would kill most other organisms . MICROBIAL GROWTH
SYNOPSIS
INTRODUCTION
REQUIREMENT FOR MICROBIAL GROWTH
PHYSICAL REQUIREMENT
NUTRITIONAL REQUIREMENT
BACTERIAL GROWTH CURVE
FACTORS AFFECTING BACTERIAL GROWTH
COUNTING OF BACTERIAL CELL. Table 3-2 lists the approximate minimum a w values for the growth of selected microorganisms relevant to food. Assistant Professor - I •The requirements for microbial growth can be divided into two main categories: physical and nutritional. Oxygen Requirements 5. You can change your ad preferences anytime. 1. Soil Microorganisms: key factors affect distribution, activity and population Authors: Rajendra Kumar Yadav and Malu Ram Yadav, Mahendra Kumar Yadav PhD. Organisms requiring high osmotic pressures are called osmophilic bacteria. On further increasing the temperature above optimal, growth rate decreases abruptly and completely ceases with reaching maximum temperature. At the temperature of -1 – 3oC, There are about 25 genera of bacteria in food causing either spoilage and or user in desirable effects. Factors affecting microbial growth in foods. If you continue browsing the site, you agree to the use of cookies on this website. Scholar, Division of Soil Science and Agricultural chemistry, ICAR-IARI, New Delhi-110012 Introduction: Soil microorganisms (Flora & Fauna), just like higher plants depends entirely on soil for their nutrition, growth and activity. Summarize the adaptations of extremophiles to their natural habitats 3. Most foods contain sufficient nutrients to support microbial growth. If you continue browsing the site, you agree to the use of cookies on this website. The genetic factor is also called internal factor because the basis of plant expression MICROORGANISMS The factors can be generally classified as intrinsic and extrinsic factors. There are a variety of environmental factors that affect microbial growth. Nutrients needed by microorganisms include: Carbon carbon containing compounds are needed as an energy source (ex. Higher storage temperature will lead to lower humidity. In the soil solution gases (oxygen, methane and carbon dioxide), and microorganisms are dissolved. Nutrients needed by microorganisms include: Carbon carbon containing compounds are needed as an energy source (ex. Chemical factors- Oxygen, carbon, nitrogen, phosphorus, sulfur, etc. Looks like you’ve clipped this slide to already. Biotechnology Factor acting deadly on Microorganisms as … Accessory – when they enhance growth, without being absolutely necessary for … Nitrogen needed for amino acids and nucleotides; some can synthesize … INFLUENCING THE GROWTH OF Hence factors such as osmotic pressure and salt concentration of the solution affect the growth of bacteria. B.Sc. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Some like high pH levels, but most often, if conditions are too acidic, then the organism's enzymes break down. Pressure 6. View BIOL_2265-_Factors_affecting_microbial_growth.ppt from BIOL 2265 at University of the West Indies at St. Augustine. 1) Oxygen requirement: Bacteria are divided into four groups according to oxygen requirement: 1. Factors affecting microbial growth FACTORS AFFECTING GROWTH … The activities of microorganisms are greatly affected by the chemical and physical conditions of their environments. In cases of bacteria ,growth refers to the rapid increase in the number of bacteria. The growth of microorganisms is influenced by various physical and chemical factors of their environment.
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