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Margaret E Gibson
July 20, 2009
Microbiology
Dr. Metera

Lab Report 3: Labs 7 and 8- Metabolism and Biochemical Tests

Abstract
This experiment focused on metabolism and biochemical tests. The goal of performing these tests was to differentiate microbes from one another and to compare how metabolic and biochemical processes differ from species to species. The tests performed include: the Fermentation of Sugars Test (sucrose, glucose, and lactose), the Urease Test, the Fermentation of Lactose Test, the Sulfide Indole Mobility (SIM) Test, the Nitrate Reduction Test, the Protein Hydrolysis Test, the Catalase Test, and the Cytochrome Oxidase Test. The microbes that were tested during this lab were: Escherichia coli, Bacillus cereus, the unknown, Proteus vulgaris, Staphylococcus epidermis, Enterobacter aerogenes, the control, and Pseudomonas fluorescens. The microbes tested during these various tests were looking for which would: reduce sulfur/produce sulfate, produce indole, or possess motility, reduce nitrate, and contain protease, catalase and oxidaase. Introduction

The purpose of these labs was to observe various metabolic processes by determining the pH of certain bacteria, determining if the bacteria was urease positive or negative, determining which bacteria ferment which sugar(s) during fermentation, and determining if bacteria are lactose fermenters and non-lactose fermenters. Metabolic processes can also be observed by determining if bacteria reduce sulfur/produce sulfate, produce indole, or possess motility, determining which bacteria are able to reduce nitrate, determining if bacteria contain protease, determining if bacteria contain catalase, and determining if bacteria contain oxidase. The tests performed to determine these metabolic processes include: the Fermentation of Sugars Test (sucrose, glucose, and lactose), the Urease Test, the Fermentation of Lactose Test, the Sulfide Indole Mobility (SIM) Test, the Nitrate Reduction Test, the Protein Hydrolysis Test, the Catalase Test, and the Cytochrome Oxidase Test. The bacteria tested include: Escherichia coli, Bacillus cereus, the unknown, Proteus vulgaris, Staphylococcus epidermis, Enterobacter aerogenes, the control, and Pseudomonas fluorescens. The different types of microbes studied in this experiment include: Escherichia coli, Bacillus cereus, Proteus vulgaris, Staphylococcus epidermis, Enterobacter aerogenes, and Pseudomonas fluorescens. Escherichia coli is mainly found in animal feces and comprises their intestines as well (US Food and Drug Administration). Bacillus cereus is a known medium of food poisoning and causes vomiting and abdominal cramps (Todar). Proteus vulgaris is connected with food spoilage of meat, poultry, and seafood and may cause diarrhea in infants (Schenectady Country Community College). Staphylococcus epidermis often infects hospital patients with weak immune systems in catheter wounds (European Bioinformatics Institute). Enterobacter aerogenes is the source of numerous infections such as bacteremia, lower respiratory tract infections, skin and soft tissue infections, urinary tract infections (UTIs), endocarditis, intra-abdominal infections, septic arthritis, osteomyelitis, and ophthalmic infections (E Medicine). Pseudomonas fluorescens are able to grow in various conditions such as soil, water, and plant habitats (European Bioinformatics Institute). Several hypotheses arise during this experiment due to the many subjects being tested. However, since there are numerous tests being performed, a more general hypothesis can be ascertained. The hypothesis for all tests in both Lab 7 and Lab 8 is that the outcome of the tests will produce the desired results in order to differentiate various species of bacteria from one another and to reveal certain characteristics of metabolic and biochemical processes. Materials and Methods

Lab 7
For Part A of Lab 7, label...
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