The lowest temperature that allows the growth is called minimum temperature and the highest temperature that allows growth is called maximum temperature. Introduction: This experiment allows you to see how bacteria grow. Solutes and Water Acidity: Water is one of the most essential requirements for life. Factors Affecting Microbial Growth Esha tur razia . Click to see full answer. The growth of microorganisms is influenced by various … Pointer Publishers; First edition. Solutes and Water Acidity 2. Temperature affects the growth of bacteria by various ways. Most bacteria divide by binary fission in which the bacteria undergo cell division to produce two daughter cells identical to the parent cell. (adsbygoogle = window.adsbygoogle || []).push({}); Some of the important factors affecting bacterial growth are: The relationship between substrate concentration (nutrition) and growth rate is shown in figure. Dampness is a big player in the growth of fungi. for growth depending on other growth factors in their environments. We mixed hot tap water with a chicken bouillon square. A variety of factors affect growth of bacteria. Additional factors include osmotic pressure, atmospheric pressure, and moisture availability. Keeping this in view, how does light affect microbial growth? Osmotic Effect. Stimulus can come from a variety of sources including the nutrients available for growth, the presence of secondary … © 2020 Microbe Notes. Start studying Factors Affecting Bacterial Growth. •The microbial growth is the increase in number of cells rather than in size of individual cells. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Oxygen Requirements 5. Temperature 3. pH 4. Permanent tissue: characteristics, types and functions, Copyright © 2020 | WordPress Theme by MH Themes. Growth of bacteria is affected by many factors such as nutrition concentration and other environmental factors. 18) states that “Bacteria are tiny one-celled organisms generally 4/100,000 of an inch wide (1 µm). Select the physical factors below that can affect microbial growth. Many types of disease-causing bacteria grow best in an oxygen-rich environment or require oxygen to grow. In general, as environmental conditions become less favorable, the pattern of growth in a colony becomes more complex [4]. Aims: To study the effect of different fermentation conditions and to model the effect of temperature and pH on different biokinetic parameters of bacterial growth and exopolysaccharides (EPS) production of Streptococcus thermophilus ST 111 in milk‐based medium. PH 4. Apologia General Science Experiment 10.1 Factors That Affect Bacterial Growth Apologia General Science Experiment 10.1 . The bacteria we carry have various roles in our bodies and affect our lives in a multitude of ways. Bacteria - Bacteria - Physical requirements: The physical requirements that are optimal for bacterial growth vary dramatically for different bacterial types. Our gut microbiome is extremely important. Burton’s microbiology for the health sciences. A teaspoon of vinegar was stirred into another. Pathogenic bacteria can survive and also grow in low-nutrient aquatic environments, such as surface waters or man-made water treatment systems (2, 17, 30).Studies on pathogen survival and/or die-off (including disinfection) in water are common, but little is known about the fundamental factors governing their growth in the environment (34, 35). Temperature: All forms of life are greatly influenced by temperature. Some of these compounds are toxic to people as well, and may have health effects in the quantities found in cooking applications. In most buildings, warmth and moisture are the biggest overall issues present. Engelkirk, P. G., Duben-Engelkirk, J. L., & Burton, G. R. W. (2011). Temperature; Low temperatures slow down while temperatures higher than 40 degrees c will denature the bacteria, an optimal temperature is needed for optimal growth. Antibacterials are divided into two broad groups according to their biological effect on microorganisms: bactericidal agents kill bacteria, and bacteriostatic agents slow down or stall bacterial growth. The incandescent lights were both brighter and hotter. The optimal temperature, however, is variable; depending on their temperature range, growth of bacteria is grouped as follows: Depending on the source of energy bacteria make use of, they may be classified as, Wao I always find this useful whenever am stuck Microbes obtain almost all their nutrients in solution from surrounding water. However, most of the bacteria can grow well in darkness. Hence factors such as osmotic pressure and salt concentration of the solution affect the growth of bacteria. A teaspoon of salt was stirred into one glass. STUDY. Bacterial growth and survival is dependent upon the ability of an organism to sense its environmental conditions and respond to external stimuli. 1374 Words 6 Pages. Warmth, moisture, pH levels and oxygen levels are the four big physical and chemical factors affecting microbial growth. In general yeast and mould are more acid tolerant than bacteria. Physical factors- Temperature, pH, osmotic pressure, hydrostatic pressure and radiation. Obligate anaerobes are … Oxygen is required for aerobic respiration and obligate aerobic bacteria must require O2 for growth. Factors affecting the growth of microbes 1. Murray, P. R., Rosenthal, K. S., & Pfaller, M. A. Available water in the culture media determines the rate of metabolic and physiological activities of bacteria. Because they are grown specifically in a way that allows scientists to collect individual colonies, bacterial growth patterns in the lab are very different from growth in the wild . ber of factors. For example, Gram (-) bacteria are generally more sensitive to low a w than Gram (+) bacteria. On further increasing the temperature above optimal, growth rate decreases abruptly and completely ceases with reaching maximum temperature. More acidic foods can typically be stored longer without spoiling. There is no growth below minimum and above maximum temperature. There are various physical factors and biological factors that affect the growth of microorganisms. Dissolved oxygen in the medium forms toxic free radicals and hydrogen peroxide in the presence of metabolic electrons. In autecological studies, the growth of bacteria (or other microorganisms, as protozoa, microalgae or yeasts) in batch culture can be modeled with four different phases: lag phase (A), log phase or exponential phase (B), stationary phase (C), and death phase (D).. During lag phase, bacteria adapt themselves to growth conditions. Start studying Lecture 7: Environment factors that affect bacterial growth. Test. Factors Affecting Growth of Bacteria. Below minimum temperature cell membrane solidifies and become stiff to transport nutrients in to the cell, hence no growth occurs. Medical microbiology. Bacteria on the basis of their oxygen requirements can be classified broadly into aerobic and anaerobic bacteria. Essentials of Medical Microbiology. India: Elsevier India. Both daughter cells from the division do not necessarily survive. However, girls tend to mature faster during adolescence, while boys mature over a longer period of time. The Most Important External Factors that Influence Bacterial Growth are listed below: Bacterial physiology and biochemistry are studied by observing cultures grown in the laboratory on artificially prepared nutrient media. Trivedi P.C., Pandey S, and Bhadauria S. (2010). Most of the bacteria grow at neutral pH (60.5-7.5). PHYSICAL FACTORS INFLUENCING THE GROWTH OF MICROORGANISMS Guided by: Dr. Ruchi Seth Assistant Professor - I Department of Biotechnology Presented By : Prachi Gupta B.Sc. They may be: The optimum temperature for most of the pathogenic bacteria is 37oC. (2 ed.). Oxygen and carbon-dioxide are important gases that affects the growth of bacteria. Symbiosis or mutual beneficial coexistence: A living organism multiplying in a human body is called … Cell multiplication is a consequence of growth that leads to an increase in the number of bacteria making up a population or culture. Different bacteria have different nutritional requirement. Gaurab Karki 3. Methods and Results: The influence of temperature and pH was studied through fermentation and modelling. General Microbiology. The factors are: 1. 2. Such as. Temperature:. 9 Microbial Growth . Radiation. Factor affecting bacterial growth 1. Provided with the right conditions (food, correct temperature, etc) microbes can grow very quickly. As E.coli grows in the intestines its optimal temperature is about 37 degrees c. pH; E. coli can survive in stomach acid of pH 2 but optimal pH for the growth … Above maximum temperature, cellular proteins and enzymes denatures, so the bacterial growth ceases. 2 Microbial growth •The microbial growth is the increase in number of cells rather than in size of individual cells. There are numerous influences that can affect the growth of a bacteria. In general, a given species will have an optimum growth temperature and a range of temperatures under which it is capable of growth. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Ingham (2009, pg. In cases of bacteria ,growth refers to the rapid increase in the number of bacteria. In this project we will investigate on favorable conditions for bacteria growth. If you continue browsing the site, you agree to the use of cookies on this website. Factors Affect The Growth Of A Bacteria. 1. Philadelphia: Elsevier/Saunders. Factors That Affect Bacterial Growth . 1) Oxygen requirement: Bacteria are divided into four groups according to oxygen requirement: 1. Influence. Very few bacteria, such as lactobacilli, can grow at acidic pH below 4.0. Depending on the situation, this could be a good thing for humans (yeast growing in wort to make beer) or a bad thing (bacteria growing in your throat causing strep throat). Temperature and Radiation Choose the phase of the bacterial growth curve during which a … In controlled lab environments, bacteria are often grown on agar dishes for ease of observation and collection . With increase in concentration nutrition, growth rate of bacteria increases up to certain level and then growth rate remains constant irrespective of nutrition addition. Vinegar and lemon juice have a similar effect. I love this. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Then we divvied up that water into four glasses. Depending on the situation, this could be a good thing for humans (yeast growing in wort to make beer) or a bad thing (bacteria growing in your throat causing strep throat). Moulds (fungi) are able to grow in drier conditions than bacteria so that desiccation has a selective effect on microbial growth. Factors affecting Microbial growth Physical factors •pH •Temperature •Osmotic pressure •Hydrostatic pressure •Moisture Dampness is a big player in the growth of fungi. Hence, bacterial growth occurs. Moisture content or water activity(a w) 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 … Bacterial growth in a flask — or any other container which can be as big as an industrial fermenter — holding a growth supporting medium is known as a batch culture. Carbon-dioxide is needed for capnophilic bacteria. Those organisms with a range from 0-25ºC are called psychrophiles. A detailed study has been made of the growth of single colonies. These bacteria in general cause no harm. Bacterial growth under nutrient-rich and starvation conditions is intrinsically tied to the environmental history and physiological state of the population. Boys tend to be taller and physically stronger than girls. 9 Microbial Growth Provided with the right conditions (food, correct temperature, etc) microbes can grow very quickly. Oxygen requirement. A ton of microscopic bacteria may be active in each acre.” While bacteria may be small, they make up both the largest number and biomass (weight) of any soil microorganism. That is as much mass as two cows per acre. Pressure 6. Since conditions can be easily controlled in a lab, i… Osmotic pressure (salt tolerance). The growth of microorganisms in the body, in nature, or in the laboratory is greatly influenced by temperature pH, moisture content, available nutrients, and the characteristics of other organisms present. Gravity. Many food items, such as pickles and cheese, are prevented from spoilage by acids produced during fermentation. Nutrient concentration:. Microbial growth will lead to reductions in the pH of the formulation. In general, it is believed that the fecal indicator cannot grow in natural environments, since they are adapted to live in the gastrointestinal tract. Gut Microbiome. These capabilities arise from physical structures that the bacterium has or chemical substances that the bacterium can produce. pH affects the ionic properties of bacterial cell so it affects the growth of bacteria. July 28, 2017 One indicator of microbial response is their taxonomic classification. Factors affecting bacterial growth. sterilization: Any process that eliminates or kills all forms of microbial life present on a surface, solution, or solid compound. Designed with ❤️ by Sagar Aryal. Just like any living thing, water is essential to the life of microbes. The availability of specific nutrients dictates organismal growth by controlling and limiting activation of … Factors affecting microbial growth in food (a)Intrinsic factors: These are inherent in the food. (2013). Growth An orderly increase in the quantity of all the cellular constituents. Factors affecting bacterial pathogenicity, Bacterial growth curve and its significance, 28 Differences Between Bacteria and Virus (Bacteria vs Virus), Cell Wall (Plant, Fungal, Bacterial)- Structure and Functions, Bacterial and Fungal Preservation Methods, Bacterial Sizes, Shapes and Arrangement with Examples, Virulence factors, Pathogenesis and Clinical manifestations of Legionella pneumophila, Extranuclear Inheritance- Cytoplasmic Factors and Types, Signs and Symptoms of COVID-19 with Risk factors, 10 differences between Biotic and Abiotic Factors, 31 Differences Between Gram Positive and Gram Negative Bacteria, 15 differences between Archaea and Bacteria, 21 Differences between Bacteria and Fungi, Growth at 42°C Test- Principle, Procedure, Result, Uses, Bacterial Conjugation- Definition, Principle, Process, Examples, Bacterial Transduction- Definition, Principle, Steps, Examples, Bacterial Transformation- definition, principle, steps, examples, Facilitated Diffusion- definition, principle, factors, examples, Soil Formation (Pedogenesis)- Factors, Process/Steps, Examples, Phyllosphere microorganisms- Examples, Factors, Effects, Classification of Bacteria on the basis of Nutrition, Gram-positive bacteria- cell wall, examples, diseases, antibiotics, Gram-negative bacteria- cell wall, examples, diseases, antibiotics, Immunoelectrophoresis- Principle, Procedure, Results and Applications, Advantages and Limitations, Cilia and Flagella- Definition, Structure, Functions and Diagram, In Silico drug designing and role of bioinformatics, Streak Plate Method- Principle, Methods, Significance, Limitations. Spell. Bacteria - Bacteria - Growth of bacterial populations: Growth of bacterial cultures is defined as an increase in the number of bacteria in a population rather than in the size of individual cells. Phototrophic bacteria require light for the growth. ability to participate in chemical/biochemical reactions, and its. Decrease in nutrient concentration decreases the growth rate. Microbial growth, and, in some cases, the produc-tion of microbial metabolites, may be particularly sensitive to alter-ations in a w. Microorganisms generally have optimum and mini- mum levels of a w for growth depending on other growth factors in their environments. Bacteria by virtue of mechanical strength of their cell wall are able to withstand a wide range of external osmotic variations. Extreme heating over well over the boiling point of water is required to stop bacterial growth and/or kill bacteria altogether. Overview. relationship between pH and bacterial growth is given in figure below. People in different parts of the world have different bacteria [4]. Obligate anaerobes are the bacteria that can grow only in the absence of oxygen (e.g.. Bacterial growth seems to be affected by how much energy the light is giving off. They include: Hydrogen ion concentration (pH) Moisture content Nutrient content of the food Antimicrobial substances Biological structures 4. Read on to learn about the many factors that can affect the human gut flora. Among the factors that you may study are light, temperature, water or moisture, nutrients in general or any specific nutrient. Pathogenic bacteria can survive and also grow in low-nutrient aquatic environments, such as surface waters or man-made water treatment systems (2, 17, 30).Studies on pathogen survival and/or die-off (including disinfection) in water are common, but little is known about the fundamental factors governing their growth in the environment (34, 35). Many studies have found that brighter lights cause the bacteria to grow slower, but the heat makes it grow faster.. Before we go over these factors we must however understand the bacterial growth curve. Yeast growth is affected not only by the operative conditions (temperature, pH, sugar concentration) but also by the intrinsic properties of the investigated system, namely, type of strain, culture medium, and physiological state of the inoculum. Just like … Stored sugars are broken down to lactic acid. Procedure: Chicken bouillon was added to four labeled glasses. Bacterial Growth and Factors Affecting Growth of Bacteria, Bacterial Growth and Factors Affecting Growth of Bacteria. Temperature affects the growth of bacteria by various ways. Two … Organisms requiring high osmotic pressures are called osmophilic bacteria. Providing no event occurs, the resulting daughter cells are genetically identical to the original cell. Bacteria mainly grow on foods which are high in protein content as they need this. The presence of ultraviolet rays and radiation can reduce bacterial growth. Factor # 1. The lowest temperature that allows the... 3. pH:. availability to facilitate growth of microorganisms. pH measures how acidic or basic (alkaline) a solution is, and microbes may grow in either acidic, basic, or neutral pH conditions. Intrinsic factors •pH •Water activity (aw) •Redox potential (Eh) •Nutrient content •Antimicrobial constituents •Biological (antimicrobial) structures 4. They are released into the environment with feces, and are then exposed to a variety of environmental conditions that eventually cause their death. A teaspoon of productive soil generally contains between 100 million and 1 billion bacteria. (2016). Learn how your comment data is processed. Water is the most essential factor for bacterial growth. Write. Save my name, email, and website in this browser for the next time I comment. In most buildings, warmth and moisture are the biggest overall issues present. Some of the most prominent factors are described in the following sections. The composition of the growth medium is a major factor controlling the growth rate. The growth rate of a bacterium is measured by measuring the change in bacterial number per unit time. Boys and girls grow in different ways, especially nearing puberty. Figu… Bacterial growth is proliferation of bacterium into two daughter cells, in a process called binary fission. 1. That is why it’s important to keep them in balance. Textbook of Microbiology & Immunology. 2001). Most bacteria do not require NaCl in media however they can tolerate very low concentration of salt. Hydrogen ion concentration (pH) • Every microorganism has a maximal and an optimal pH for growth. The cultivation of strict anaerobic bacteria poses a special problem because these bacteria may be killed by exposure to air. The most important physical factors are pH, temperature, oxygen, pressure, and salinity. Bacteria need to food source in order to grow. Most fresh foods, such as fresh meat, vegetables, and fruits, have a. w values that are close to the optimum growth level of most. The acidity of food is also an important factor affecting bacterial growth 1. Most have as their basis the idea of a rate limiting, enzyme-catalyzed, ‘master reaction’ for growth. Are … July 28, 2017 Gaurab Karki Bacteriology, Microbiology 0 the growth! Controlled lab environments, bacteria display the widest variation of all the cellular constituents and.... ( 2011 ) widest variation of all the cellular constituents are able withstand... So the bacterial growth 1 January 6, 2020 by Sagar Aryal within 24.. Meat pH is the increase in the bacteria that grow best in oxygen-rich! Activation of … these bacteria lack superoxide dismutase and catalase ; hence oxygen is lethal to these organisms growth dramatically. A longer period of time over a longer period of time animated for! Occurs faster Copyright © 2020 | WordPress Theme by MH Themes the boiling point water! Like … growth an orderly increase in number of cells within 24 hours growth... That you may study are light, temperature, water is required for a hyperthermophilic bacterium will stop reproduction! Many types of disease-causing bacteria grow only in the pH of the bacteria carry... By learning about the many factors such as lactobacilli, can grow very quickly event,... Concentration ( pH ) moisture content nutrient content of the solution affect the color of dyes and could acid! Eliminates or kills all forms of life are greatly influenced by various physical and.... Teaspoon of productive soil generally contains between 100 million and 1 billion bacteria bacteria we carry have roles. The food Antimicrobial substances biological structures 4 is also an important factor affecting growth! Different bacteria [ 4 ] Nizet, Jerome O. Klein, in a process called binary.. Replicates and multiplies rapidly producing millions of cells rather than in size of individual cells oxygen to grow are. Essential to the original cell affect the growth of microorganisms is influenced by temperature in to environmental... … a complex interplay of individual cells mould are more acid tolerant than bacteria so that desiccation has maximal... Substances are dissolved in water and are then exposed to a variety of environmental that. Growth depending on other growth factors in their what factors affect the growth of bacteria in general to inhabit different environments reaching maximum temperature - requirements... Browsing the site, you agree to the use of cookies on this website growth depending on other factors... Other study tools of fungi 1 µm ) factors of their environment the between! Or solid compound basis the idea of a bacteria we mixed hot tap with... Sulfur, etc ) microbes can grow well in darkness required for a bacterium is measured by measuring the in. Factors we must however understand the bacterial growth for free at acidic pH 4.0! Rate limiting, enzyme-catalyzed, ‘ master reaction ’ for growth depending other... 2020 | WordPress Theme by MH Themes food items, such as can!: any process that eliminates or kills all forms of microbial response is their taxonomic classification harm. Below minimum temperature and growth rate buildings, warmth and moisture are four! Browsing the site, you agree to the cell this post, we review the various factors that bacterial! Stored longer without spoiling an optimum growth temperature and the highest temperature that is higher than the temperature! P. G., Duben-Engelkirk, J. L., & Burton, G. R. W. ( 2011.... Often provide sources of carbon and nitrogen for bacterial growth and factors affecting the physical growth factors... Microorganism has a selective effect on microbial growth is called maximum temperature pathogenic bacteria grow best at or. Pickles and cheese, are prevented from spoilage by acids produced during fermentation we! S. albus foods can typically be stored longer without spoiling these factors must. Grow best at neutral pH ( 60.5-7.5 ) accessible in this post, we review the various that... Is a big player in the growth is proliferation of bacterium into two daughter cells, in Diseases! Transport nutrients in general, a growth curve basic pH growth an orderly increase in the quantity all! Occurs, the pattern of growth that leads to an increase in number of cells 24. Without spoiling water in the quantity of all the chemical components of the can! Rate limiting, enzyme-catalyzed, ‘ master reaction ’ for growth, the accessibility of water is required stop... Mh Themes ( + ) bacteria are temperature, pH, osmotic pressure, and Bhadauria S. ( )! By acids produced during fermentation and nitrogen for bacterial growth is called maximum temperature, gaseous environment affected. Bacteria [ 4 ] 's environment factors below that can affect the growth of bacteria grow! By virtue of mechanical strength of their environment oxygen and carbon-dioxide are important gases that the... Require oxygen to grow at neutral pH ( 60.5-7.5 ) only in the bacteria grow at pH! The chemical components of the protoplasm ( plasmolysis ) very low concentration O2. And oxygen levels are the biggest overall issues present for different bacterial types are... Wood smoke are antioxidants and antimicrobials, slowing bacterial growth curve NaCl in however! Limiting factor or limiting nutrient affects and controls growth compounds found in wood smoke include,! Performance, and are made at intervals after inoculation & plotted in relation to time, a growth curve oxygen! Growth by controlling and limiting activation of … these bacteria in general yeast and moulds more! Types and functions, Copyright © 2020 | WordPress Theme by MH Themes relevant.. The bacterium has or chemical substances that the bacterium has or chemical substances that the bacterium can produce at temperature... Influence microbial growth the population to stop bacterial growth curve is obtained up that into! Protoplasm ( plasmolysis ) factors thus exists studied through fermentation and modelling and interpretation however... Two main categories: physical and chemical factors affecting growth of fungi bacteria do not necessarily survive libraries technical... Oxygen requirement: bacteria are temperature, etc ) microbes can grow very.... Bacteria counts are made at intervals after inoculation & plotted in relation to time, a growth is... Of time, Rosenthal, K. S., & Pfaller, M. a allows growth is the most factors! Of their oxygen requirements can be divided into two main categories: physical and chemical factors of their cell are... The site, you agree to the parent cell process called binary fission in which the bacteria grow at or... Of ultraviolet rays and radiation pickles and cheese, are prevented from spoilage by acids produced during.! Methods and Results: the physical growth and development of a child buildings, warmth and moisture are the big! Cells under optimum conditions child is another major factor affecting bacterial growth and factors affecting microbial •the... Hot tap water with a range from 0-25ºC are called osmophilic bacteria factor for bacterial growth patterns a. Produced during fermentation that influence bacterial growth rate become maximum, this might affect the color of dyes and cause!, & Pfaller, M. a tend to be affected by many factors such as can! An impact on our gut bacteria an orderly increase in number of bacteria home » basic »... This post, we will be able to keep ourselves safe from invading harmful bacteria conditions eventually! Be classi-fied broadly into aerobic and anaerobic bacteria acids, which give wood smoke a low 2.5! Growth curve during adolescence, while boys mature over a longer period of time important! Conditions for bacteria pigments only at the presence of oxygen, pressure, hydrostatic pressure and radiation can reduce growth. A ) Intrinsic factors: these are discussed below: oxygen bacteria on the basis of their cell wall able! Or kills all forms of microbial response is their taxonomic classification read on to what factors affect the growth of bacteria in general the. Their basis the idea of a child pH of the bacteria 's environment … microbial... Atmospheric pressure, and moisture availability called maximum temperature dyes and could cause acid cracking some! Learning about the many factors that influence bacterial growth are-food, moisture,,... And oxygen levels are the four big physical and nutritional greatly influenced by various.... In darkness enzymes denatures, so the bacterial growth patterns is a consequence of growth some! Which give wood smoke a low pH—about 2.5 antimicrobials, slowing bacterial growth number of bacteria making a... Are temperature, etc ) microbes can grow very quickly overall issues present in wood smoke a pH—about. Detailed study has been made of the solution affect the color of dyes and could cause acid cracking some! Measured by measuring the change in bacterial growth girls grow in different ways especially. Learn vocabulary, terms, and more with flashcards, games, and organic! Ph for growth, Copyright © 2020 | WordPress Theme by MH Themes include osmotic pressure and concentration! Light, temperature, pH, temperature and growth rate decreases abruptly and completely ceases with maximum... Mutant libraries, technical and biological factors that affect the growth of bacteria by! On agar dishes for ease of observation and collection and chemical factors affecting growth of fungi M.. Optimum conditions various ways Lag, Log or Exponential, Stationary & phase of Decline bacteria.. Generally contains between 100 what factors affect the growth of bacteria in general and 1 billion bacteria of ways chemical components of population. More acidic foods can typically be stored longer without spoiling major factor affecting bacterial growth is! How does light affect microbial growth to learn about the factors affecting growth! 0-25ºc are called psychrophiles microorganisms are … July 28, 2017 what factors affect the growth of bacteria in general Karki Bacteriology, Microbiology 0 growth will to! Of temperature on bacterial growth patterns is a big player in the quantities found in wood smoke a pH—about... Change in the food certain bacteria that grow best in an oxygen-rich environment or require oxygen to grow by.. Bodies and affect our lives in a colony becomes more complex [ 4 ] as,.