Bacterial Growth Requirements Evelyn Lyle ITT Technical Institute Angela Ask‚ MPS January 15‚ 2012 Every organism must find in its environment all of the substances required for energy generation and cellular biosynthesis. The chemicals and elements of this environment that are utilized for bacterial growth are referred to as nutrients. Many bacteria can be identified in the environment by inspection or using genetic techniques. The nutritional requirements of a bacterium such as E Coli are
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Title: Chapter 7: Bacterial Growth Purpose: The purpose of this experiment is to observe the bacterial growth of Escherichia coli under various conditions. Physical factors and nutritional requirements determine the overall concentration of the bacteria. Along with the use of a spectrophotometer and the technique of serial dilution‚ countable colonies can be obtained. Results are plotted on a semi-log graph in order to observe the different growth curves corresponding to optical density (cell
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Unit 3. Assignment 1: Bacterial Growth Rates 1. Mediums that could be used to determine shigellosis include Btilliant Green Agar‚ and Triple Sugar-Iron Agar. Expected results in a confirmed case of shigellosis are as follows: Brilliant Green Agar – Isolated Shigella colonies which do not ferment lactose or sucrose and appear red or white in color with no growth to trace growth on the Agar plate will be present. Triple Sugar-Iron Agar – Presence of Shigella will manifest as a red slant with
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Bacterial growth patterns and the effects of environmental factors on properties of colonies ERIC LI Abstract In this experiment we work with different types of bacteria and experiment with their different properties and how they grow in certain situations. Different samples of bacteria cultures were gathered from different places such as the mouth‚ shaded mulch‚ and from the table top. The samples were collected by using a cotton swab and swiped onto a petri dish filled with nutrient agar. The
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Bacterial growth is the division of one bacterium into two daughter cells in a process called binary fission. Providing no mutational event occurs the resulting daughter cells are genetically identical to the original cell. Hence‚ "local doubling" of the bacterial population occurs. Both daughter cells from the division do not necessarily survive. However‚ if the number surviving exceeds unity on average‚ the bacterial population undergoes exponential growth. The measurement of an exponential bacterial
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Fighting Bacterial Growth The purpose of this lab was to determine the effectiveness of antiseptics‚ disinfectants‚ and antibiotics on bacteria. The hypothesis was that if bleach was used‚ it would be the most effective because bleach is commonly used to clean and disinfect various things. The variables that were tested were antibacterial soap and Scope mouthwash for the antiseptics; bleach and ammonia for the disinfectant; and Cipro‚ erythromycin‚ and tetracycline for the antibiotics. All of these
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Bacteria Growth Requirements Microbiology Life as we now it has ended. What is left you ask? Well it is said the only thing that could survive an incident that could end our known way of life is a roach and a pack or Twinkies. In truth the great survivor would be microorganisms. Microorganisms can survive where most cannot due to their size‚ nutritional needs‚ energy requirements‚ and are very good at adapting to different environments (Black 2008). Microorganisms require two things to
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Effect of Osmotic Stress and Temperature on Microbial Growth BIO 3400-002L – Microbiology Lab 1 Effect of Osmotic Stress and Temperature on Microbial Growth Luiz Felipe Isidoro ABSTRACT Evolution allowed primitive forms of life to develop proteins and enzymes that made it possible for life to evolve under environments with hostile conditions‚ such as high salt and heat. More specifically‚ some bacteria selected genes that code for peptides with stronger intermolecular forces‚ coping
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high and low temperatures; low amounts of oxygen and water; and high levels of salinity‚ acidity‚ alkalinity‚ and radiation. Examples of extreme environments on Earth are hot geysers and oceanic thermal vents‚ Antarctic sea ice‚ and oxygen-depleted rivers and lakes. Organisms that have evolved special adaptations that permit them to live in extreme conditions are called "extremophiles." Photo by: Dmitry Pichugin "Thermophiles" are microorganisms with optimal growth temperatures between 60 and
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Study of Bacterial Growth and Resistance Level to Certain Antibiotics INTRODUCTION Escherichia coli—better known as E. coli—is a gram negative‚ rod shaped bacteria. It is relatively harmless‚ but can occasionally cause food poisoning. It can also provide Vitamin K2. It prevents the establishment of pathogenic bacteria‚ and is associated with or found in the intestinal organ. The antibiotic that E. coli is resistant to is Penicillin. Bacillus subtilis—better known as B. subtilis—is known as
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