Polymers are large macromolecules composed of many small repeating subunits (monomers) connected via covalent bonds. Both natural and synthetic polymers are created via polymerization of these small molecules (Chemistry 144 Writing Assignment information sheet). The chosen polymer, polytetrafluoroethylene (PTFE) in the form of Teflon®, is a synthetic fluoropolymer of tetrafluoroethylene (Wikipedia, 2015), and is one of the most well-known brand names for PTFE based formulas, owned by DuPont Co.…
The catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, protects the bacteria from the toxic by-products of oxygen metabolism. This enzyme is produced by bacteria that respires using oxygen. The catalase-positive bacteria include strict aerobes. Catalase-negative bacteria may be anaerobes, or they may be facultative anaerobes do not respire using oxygen as a terminal electron acceptor. The test reaction is very fast and obvious bubbles will be seen. 30% Hydrogen peroxide will be drop on a glass slide. The inoculum of 24 hours fresh culture will be picked by using sterile loop and placed on the slide that contain H²O² drop. Bubble formation on the slide will show…
| LabRepQuiz010 Question MC #7: Which of the following is the best written sentence that includes the information below taken from an article written by Dr. Costanza, but avoids plagiarism?…
Purpose: To be familiarized with the science and techniques used to identify different types of bacteria based on their DNA sequences.…
Purpose: to test cohesion and adhesion of distilled H2O, tap H2O, salt H2O, and soapy H2O…
Staphylococcus aureus is very heat resistant and reheating foods will not destroy it, although the bacteria may be destroyed (www.sunysccc.edu). About 30 per cent of healthy humans are carriers of S. aureus, they have the bacteria on their skin without any active infection or disease. Staphylococci hide their antigens to avoid an immune response many different ways to include killing infection-fighting cells (phagocytes), surviving within host infection-fighting cells, and developing a resistance to antibiotics (www. dermnetnz.org)…
A. Water boils at 100C at sea level. If the water in this experiment did not boil at 100 C, what could be the reason?…
The purpose of this lab was to identify two unknown bacteria cultures using various differential tests. The identification of these unknown cultures was accomplished by separating and differentiating possible bacteria based on specific biochemical characteristics. Whether the tests performed identified specific enzymatic reactions or metabolic pathways, each was used in a way to help recognize those specifics and identify the unknown cultures. The differential tests used to identify the unknown cultures were oxidase, catalase, lactose and sucrose fermentation, Kugler/iron agar, nitrate reduction, gelatin hydrolysis, starch hydrolysis, manitol salt, MR-VP, citrate, bile esculin, indole, urease, DNase, and coagulase.…
There are many reasons for identifying an unknown bacterium. The reasons range from medical purposes, such as determining if the unknown could cause ailments in living things or knowing what microorganisms are needed to make antibiotics. The experiment was done by applying methods in order to identify an unknown bacterium.…
What substance is not present in tube S2 for the production of the brown-colored substance?…
Purpose: In this lab, I will observe macroscopic changes that occur when mixing together certain chemicals and household cleaners. The mixing of the chemicals provided with each other and with acid/base indicators demonstrates how matter can change, and how chemistry can be seen with the naked eye. By mixing household cleaners with an acid/base indicator I hope to demonstrate how these changes can be related to everyday life.…
The reason of this experiment was to identify the properties and effects of osmosis. Osmosis can be defined as the diffusion of water through a selectively permeable membrane. (Miller/Levine) Osmosis occurs when there is an area of higher and lower concentration. Osmosis is a type of diffusion. Diffusion is when molecules move from an area of higher concentration to an area of higher concentration. The three types of concentrations are hypotonic, hypertonic, and isotonic. When in comparison to another solution, a hypertonic solution has a lower concentration, a hypertonic solution has a higher concentration, and an isotonic is when the two solutions have an equal concentration. The experiment tested the relationship between the concentration of an egg and solutions of different concentrations. The hypothesis is that an egg placed in distilled water will gain mass while an egg placed in syrup would lose mass.…
PURPOSE: The purpose of this experiment is for the students to get a better knowledge with the laboratory tools and techniques. This experiment taught me how to convert between SI units and standard American units of mass, length, temperature, volume and time as well as how to measure the units. Students become proficient in laboratory techniques such as measuring temperature and volume and calculating within them.…
The first patient type to be selected was normal and then breathing pattern unforced was also selected. The start button was clicked and this produced start of the graph.…
To determine the amount of anti-microbial peptide production by Staphylococcus warneri under various conditions when 2L and 10L Fermented.…