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Pam Shelton Biology Undergraduate, Health Science Concentration Tennessee Technological University

Effects of pH on the Growth of Staphylococcus aureus , Streptococcus agalactiae , and Escherichia coli species. Pam Shelton Biology Undergraduate, Health Science Concentration Tennessee Technological University. Project Summary. Harmful bacteria in environement

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Pam Shelton Biology Undergraduate, Health Science Concentration Tennessee Technological University

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  1. Effects of pH on the Growth of Staphylococcus aureus, Streptococcus agalactiae, and Escherichia coli species Pam Shelton Biology Undergraduate, Health Science Concentration Tennessee Technological University

  2. Project Summary • Harmful bacteria in environement • Helpful to know about their growth • Monitor growth of pathogens at varying pH levels • Expect each organism will have different optimal pH • Expect organisms will have similar ranges

  3. Introduction/Background • Staphylococcus aureus • “responsible for a wide range of human disease, including septicemia; endocarditis and pneumonia; and wound, bone and joint infection (Feil et al 2003).” • “associated with nosocomial infections (Caiazza and O’Toole 2003).”

  4. Introduction (cont) • Streptococcus agalactiae • Group B Streptococcus • “most common cause of bacterial infection in the newborn (Curtis et al 2003).” • “leading cause of bacterial sepsis, pneumonia, and meningitits in neonates (Tettlin et al 2002).”

  5. Introduction (cont) • Escherichia coli • Associated with food products • “presence of feces on meat products is a primary source of foodborne pathogens, such as Escherichia coli 0157:H7 (Ashby 2003).”

  6. Introduction (cont) • All cause disease if present in large amounts or immune system is compromised • Learning about growth allows for development of ways to limit growth

  7. Objective/Hypothesis • Hypothesis: Various bacteria require different pH levels in order to grow properly. • Objective: To determine the pH range and optimal pH for the growth of Staphylococcus aureus, Streptococcus agalactiae, and Escherichia coli

  8. Methods and Material • Tube growth method (Kelly et al 2003) • Growth broth ranging from pH 0 to pH 14 • Inoculate with bacteria • Incubate and Record growth • Narrow growth broth pH range (e.g. 7.0, 7.2, 7.4,etc) • Inoculate with bacteria • Incubate and Record growth • Link to Data Form

  9. Methods/Materials (cont) • Method performed for each organism in three trials • Eliminates experimental error • Average of values used as final result • Held constant with each organism and trial • Amount of bacteria used for inoculation • Temperature of incubator • Time of incubation • Broth composition (except pH determinate)

  10. Expected Results and Benefits • Each organism will prefer unique optimal pH • Significantly larger number of growth in this tube • pH ranges similar in all three organisms • All will grow in a wide range of tubes • Yet, with varying amounts of growth • Information used to develop chemical nature of products (cleaners, soap, etc)

  11. Project Timelines • Topic Selection: Aug 20, 2003- Aug 27, 2003 • Title Selection: Aug 20,2003- Sept 3, 2003 • Research Matrix Development: Sept 3, 2003- present • Locating Literature Reveiws: Sept 3, 2003 – present • Hypothesis Development: Sept 10, 2003- Sept 17, 2003 • Creating Data Forms: Sept 24, 2003- October 1, 2003 • Power Point Presentation: Oct 1, 2003- present • Research Proposal Development: Oct 1, 2003- present • Research: Oct 15, 2003- Oct 29, 2003 • Poster Development: Nov 5, 2003- Nov 12, 2003 • Manuscript Preparation: Aug 20, 2003- Dec 3, 2003

  12. Literature Cited • Ashby, K., Wen, J., Chowdhury, P., Casey, T., Rasmussen, M., Petrich, J. 2003. Fluorescence of dietary porphyrins as a basis for real-time detection of fecal contamination on meat. Journal of Agriculture and Food Chemistry 51: 3502-3507. • Caiazza, N., O’Toole, G. 2003. Alpha-toxin is required for biofilm formation by Staphylococcus aureus. Journal of Bacteriology 185: 3214-3217. • Curtis, J., Kim, G., Wehr, N., Levine, R. 2003. Group B Streptococcal phospholipid causes pulmonary hypertension. Proceedings of the National Academy of Sciences of the United States of America 100: 5087-5090. • Feil, E., Cooper, J., Grundmann, H., Robinson, D., Enright, M., Berendt, T., Peacock, S., Smith, J., Murphy, M., Spratt, B., Moore, C., Day, N. 2003. How clonal is Staphylococcus aureus? Journal of Bacteriology 185: 3307-3316. • Kelly, C., Rudd, J., Hobka, M. 2003. Effects of pH on mercury uptake by an aquatic bacterium: Implications for hg cycling. Environmental Science and Technology 37: 2941-2946. • Tettelin, H., Masignani, V., Cieslewicz, M., Eisen, J., Peterson, S., Wessels, M., Paulsen, I., Nelson, K., Margarit, I., Read, T., Madoff, L., Wolf, A., Beanan, M., Brinkac, L., Daugherty, S., DeBoy, R., Durkin, A., Kolonay, J., Madupu, R., Lewis, M., Radune, D., Fedorova, N., Scanlan, D., Khouri, H., Mulligan, S., Carty, H., Cline, R., Van Aken, S., Gill, J., Scarselli, M., Mariani, M., Vegni, F., Maione, D., Rinaudo, D., Rappuoli, R., Telford, J., Kasper, D., Grandi, G., Fraser, C. 2002. Complete genome sequence and comparative genomic analysis of an emerging human pathogen, serotype V Streptococcus agalactiae. Proceedings of the National Academy of Sciences of the United States of America 99: 12391-12396.

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