The PowerPoint PPT presentation: "Factors affecting microbial growth" is the property of its rightful owner. I-Semester. Accessory – when they enhance growth, without being absolutely necessary for … Factors Affecting The Growth Of Microbes. You can change your ad preferences anytime. Factors that Influence Microbial Growth December 31, 2001 Evaluation and Definition of Potentially Hazardous Foods 1. Summarize the adaptations of extremophiles to their natural habitats 3. 7.3 Influences of environmental factors on growth 1. Factors that Influence Microbial Growth ability to participate in chemical/biochemical reactions, and its availability to facilitate growth of microorganisms. There are about 25 genera of bacteria in food causing either spoilage and or user in desirable effects. The activities of microorganisms are greatly affected by the chemical and physical conditions of their environments. If so, share your PPT presentation slides online with PowerShow.com. Water activity / moisture content . Factors on Growth • Most organisms grow in fairly moderate environmental conditions • Extremophiles –grow under harsh conditions that would kill most other organisms . Chemical factors- Oxygen, carbon, nitrogen, phosphorus, sulfur, etc. There are a variety of environmental factors that affect microbial growth. Dr. Ruchi Seth 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. View BIOL_2265-_Factors_affecting_microbial_growth.ppt from BIOL 2265 at University of the West Indies at St. Augustine. MICROBIAL GROWTH  SYNOPSIS  INTRODUCTION  REQUIREMENT FOR MICROBIAL GROWTH  PHYSICAL REQUIREMENT  NUTRITIONAL REQUIREMENT  BACTERIAL GROWTH CURVE  FACTORS AFFECTING BACTERIAL GROWTH  COUNTING OF BACTERIAL CELL. Factors Affecting Microbial Growth Control of Microbial Growth: Introduction Early Temperature 2. Nutrients needed by microorganisms include: Carbon carbon containing compounds are needed as an energy source (ex. The factors can be generally classified as intrinsic and extrinsic factors. Some physicals requirements for proper growth of bacteria are temperature, gaseous environment. Factor # 1. INFLUENCING THE GROWTH OF The chemical factors are gases, acids, micro- and macro-elements, clay minerals, etc. Title: Factors affecting microbial growth 1 Factors affecting microbial growth 2 Factors affecting microbial growth. We discussed the nutrient requirements of microorganisms. Intrinsic Factors • Nutrients • pH and buffering capacity • Redox potential • Water activity • Antimicrobial constituents • Antimicrobial structures . pH ; Moisture ; Nutrient Content ; Oxygen ; Light ; 3 pH. The process of growth depends on the availability of requisite nutrients and their transport into the cells, and the environmental factors such as aeration, O 2 supply, temperature and pH. Oxygen requirement. Nitrogen needed for amino acids and nucleotides; some can synthesize … We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 3. Use the terms that describe a microbe’s growth range or requirement for each of the factors that influence microbial growth 2. glucose) for building blocks. In general, there are two factors affecting plant growth and development : genetic and environmental. 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). 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? Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Several factors encourage, prevent, or limit the growth of microorganisms in foods, the most important are a. w, pH, and temperature. Factors Affecting Microbial Growth Food. The most important physical factors are pH, temperature, oxygen, pressure, and salinity. The most important factors that affect microbial growth in foods can be summarized in the following categories: (i) factors related to the food itself, the “intrinsic factors,” which include nutrient content, water activity, pH value, redox potential, and the presence of antimicrobial substances and mechanical barriers to microbial invasion; (ii) factors related to the environment in which the food is stored, the … for growth depending on other growth factors in their environments. Some like high pH levels, but most often, if conditions are too acidic, then the organism's enzymes break down. 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 The following points highlight the six main physical factors affecting the growth of microorganisms. Most foods contain sufficient nutrients to support microbial growth. Higher storage temperature will lead to lower humidity. Procedure (Incubators only): Different labs will have vastly different equipment and bacterial strains, so this lab exercise is designed openly for change with two procedures, one for those using only incubators and another for those using both incubators and water baths. Dr. Shyamal Kr Paul 21. Solutes and Water Acidity: Water is one of the most essential requirements for life. One indicator of microbial response is their taxonomic classification. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Nitrogen needed for amino acids and nucleotides; some can synthesize … Organisms requiring high osmotic pressures are called osmophilic bacteria. Food. APIdays Paris 2019 - Innovation @ scale, APIs as Digital Factories' New Machi... Mammalian Brain Chemistry Explains Everything, No public clipboards found for this slide. PH 4. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure •Moisture 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. The chemicals are very important for microorganisms as these provide nutrition for growth, activity and survival of microorganisms in ecologically deficient niches in soil. When microorganisms grow in food, they cause varying degrees of change in the food's characteristics as a result of metabolic activity. Antimicrobial constituents In Situ Bioremediation;Types, Advantages and limitations, Customer Code: Creating a Company Customers Love, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). Redox potential. Hence factors such as osmotic pressure and salt concentration of the solution affect the growth of bacteria. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. See our Privacy Policy and User Agreement for details. You can change your ad preferences anytime. The factors influencing the growth of microorganisms are physical, chemical and biological in nature. FACTORS AFFECTING MICROBIAL GROWTH Factors affecting microbial growth In general, there are of two types of factors exist: ... optimum growth level of most microorganisms (0.97 - 0.99). •The requirements for microbial growth can be divided into two main categories: physical and nutritional. Microbial Growth FATTOM Food Acid Temperature Time Oxygen Moisture Factors Affecting Microbial Growth. It can be : Essential – when growth does not occur in their absence. Factors Affecting. Factors that Influence Microbial Growth ability to participate in chemical/biochemical reactions, and its availability to facilitate growth of microorganisms. 5 (factors affecting microbial growth), Lecture 3 intrinsic and extrinsic factors, No public clipboards found for this slide. Most microorganisms, including most human pathogens, are neutriphils, organisms that prefer a neutral pH level. Now customize the name of a clipboard to store your clips. If you continue browsing the site, you agree to the use of cookies on this website. PHYSICAL FACTORS The growth of microorganisms is influenced by various physical and chemical factors of their environment. Factor acting deadly on If you continue browsing the site, you agree to the use of cookies on this website. 17 . Table 3-2 lists the approximate minimum a w values for the growth of selected microorganisms relevant to food. Now customize the name of a clipboard to store your clips. •The microbial growth is the increase in number of cells rather than in size of individual cells. •The requirements for microbial growth can be divided into two main categories: physical and nutritional. Different organisms react to their environment in different ways. Factors affecting microbes in foods. 3. pH: pH affects the ionic properties of bacterial cell so it affects the growth of bacteria. Department of Biotechnology Learn vocabulary, terms, and more with flashcards, games, and other study tools. Clipping is a handy way to collect important slides you want to go back to later. 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). Temperature Theoretically, bacteria can grow at all temperatures between the freezing point of water and the temperature at which protein or protoplasm coagulates. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure •Moisture •Radiation •Oxygen concentration Nutritional factors … If you continue browsing the site, you agree to the use of cookies on this website. Bacteria by virtue of mechanical strength of their cell wall are able to withstand a wide range of external osmotic variations. 2. See our User Agreement and Privacy Policy. Some of these changes, like those taking place during fermentation, are desirable, while others, like those resulting in food spoilage and food poisoning, are undesirable. Nutrients needed by microorganisms include: Carbon carbon containing compounds are needed as an energy source (ex. Osmotic pressure (salt tolerance). 2. 3. B.Sc. Bacteria grow only in the presence of oxygen, called: strict aerobes. FACTORS AFFECTING PLANT GROWTH Plant growth factors control or influence plant characteristics as well as adaptation. Temperature requirement. Guided by: Solutes and Water Acidity 2. Food. Factor of relative humidity. … On further increasing the temperature above optimal, growth rate decreases abruptly and completely ceases with reaching maximum temperature. The genetic factor is also called internal factor because the basis of plant expression At the temperature of -1 – 3oC, In the soil solution gases (oxygen, methane and carbon dioxide), and microorganisms are dissolved. Start studying FDST 421 Quiz #10 [Factors affecting growth & survival of microorganisms in foods]. Some bacteria require a high Physical factors- Temperature, pH, osmotic pressure, hydrostatic pressure and radiation. Biotechnology There are various physical factors and biological factors that affect the growth of microorganisms. Growth of microorganisms in food is dependent on various parameters. Factors Affecting. pH measures how acidic or basic (alkaline) a solution is, and microbes may grow in either acidic, basic, or neutral pH conditions. Higher PPT. The growth of microorganisms is a highly complex and coordinated process, ultimately expressed by increase in cell number or cell mass. Factors affecting the growth of microorganisms. Temperature. Factors affecting microbial growth in food • Intrinsic Factors • Environmental Factors • Implicit Factors • Processing Factors . Looks like you’ve clipped this slide to already. Somewhere between these maximum and minimum points lies the optimum temperature at which the bacteria grow best. The factors are: 1. Temperature range – growth does not occur above the maximum or below the minimum. Prachi Gupta Radiation. Temperature Vary in their temperature requirements. Microorganisms also prefer a certain pH level in the substance or environment in which they grow--that is, they prefer to have particular acidic qualities in their surroundings. View Lecture Slides - 6-16 Factors_Affecting_Microbial_growth.ppt from BIO 150 at Wichita State University. Factor Of Relative Humidity. Presentation Summary : Factors affecting the growth of microbes. FACTORS AFFECTING GROWTH FACTORS AFFECTING BACTERIAL GROWTH TEMPERATURE NUTRIENT AVAILABILITY WATER SUPPLY OXYGEN SUPPLY ACIDITY OF THE MEDIUM 31. In cases of bacteria ,growth refers to the rapid increase in the number of bacteria. At certain temperature the growth rate become maximum, this temperature is known as optimal temperature. Microorganisms show varying sensitivity to different types of factors. Factors Affecting Microbial Growth Food. Temperature 3. pH 4. Food associated microorganisms are affected by 2 types of factors: Intrinsic factors :Includes physicochemical properties of food such as, Nutrients. Factors affecting microbial growth. Clipping is a handy way to collect important slides you want to go back to later. Soil Microorganisms: key factors affect distribution, activity and population Authors: Rajendra Kumar Yadav and Malu Ram Yadav, Mahendra Kumar Yadav PhD. 1) Oxygen requirement: Bacteria are divided into four groups according to oxygen requirement: 1. glucose) for building blocks. Factors affecting the growth of M.O divided to A) Intrinsic factors Factors inherent to food itself 1-Water activity 2- pH 3- Oxidation reduction potential 4- Nutrient content 5- Antimicrobial constituents 6-Biological structure Looks like you’ve clipped this slide to already. Food is a chemically complex matrix, and predicting whether, or how fast, microorganisms will grow in any given food is difficult. Temperatures below the minimum stop bacterial growth … 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 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. Factors Affecting the Growth of Microorganisms in Foods . Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. For example, Gram (-) bacteria are generally more sensitive to low a w than Gram (+) bacteria. See our Privacy Policy and User Agreement for details. 1. The factors are: 1. Oxygen Requirements 5. Growth Factors Some bacteria require certain organic compounds in minute quantities – Growth Factors OR Bacterial Vitamins. pH and buffering capacity . As the following section shows, growth may be profoundly affected by a number of physical factors. 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. Factors affecting microbial growth in foods. Pressure 6. The availability of water depends on two factors … Gaseous Requirements 3. Microorganisms as … See our User Agreement and Privacy Policy. Factors affecting microbial growth in foods: Factor affecting growth of microorganisms in food are divided into two types: Intrinsic parameter or factors; Extrinsic parameter or factors; 1. Presented By : Microbial Growth FATTOM Food Acid Temperature Time Oxygen Moisture Factors Affecting Microbial Growth. MICROORGANISMS Intrinsic parameter: Inherent or natural characteristics of food that affects growth of microbes in it are called intrinsic parameter of food. Factors Affecting Microbial Growth advantix | Factors Affecting Microbial Growth. Factors affecting bacterial growth Factors affecting bacterial growth are: 1. Do you have PowerPoint slides to share? Factors affecting microbial growth FACTORS AFFECTING GROWTH … This article throws light upon the four important physical factors that affect the growth of micro-organisms. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Factors Affecting Bacterial Growth Temperature Atmosphere – O2 & CO2 H-ion concentration Moisture & drying Osmotic effects Radiation Mechanical & sonic stress. The key to a productive staff is creating and maintaining a safe and healthy work environment. The microbial flora of food consists of microorganisms associated with the raw material, processing and those surviving pasteurization and preservation treatments. Assistant Professor - I Purpose: to observe the affect that different temperatures have on the growth of microorganisms. Thus, its availability becomes most important factor for the growth of microorganisms. Growth An orderly increase in the quantity of all the cellular constituents. If you continue browsing the site, you agree to the use of cookies on this website. Biology 120 lectures for 2nd exam 2012 2012 (part 1 microbial growth), Lect. Cell number or cell mass solutes and Water Acidity: Water is one of the solution affect growth... 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