Volume 6, Spring 2008 - Saddleback College

36
Saddleback Journal of Biology
Spring 2008
Fall 2007 Biology 3A Abstracts
Urrila, A. S., Hakkarainen, A., Heikkinen, S., Vuori,
K., Stenberg, D., Häkkinen, A., Lundbom, N., and
Porkka-Heiskanen, T. (2003). Metabolic Imaging of
Human Cognition: An fMRI/ 1 H-MRS Study of Brain
Lactate Response to Silent Word Generation. Journal
of Cerebral Blood Flow & Metabolism, 23, 942–948
Weiskopf, R. B., Feiner, J., Hopf, H. W., Viele, M. K.,
Watson, J. J., Kramer, J. H., Ho, R. and Toy, P. (2002).
Oxygen Reverses Deficits of Cognitive Function and
Memory and Increased Heart Rate Induced by Acute
Severe Isovolemic Anemia, Anesthesiology 2002;
96:871–7.
The Effects of pH on Escherichia coli Fermentation
YURIKO KAYAMA
Department of Biological Sciences, Saddleback College, 28000 Marguerite Parkway, Mission Viejo,
CA 92692, USA
The studies of Escherichia coli are closely related to human lives because they live in
mammals’ gastrointestinal and sometimes cause diseases after changing to pathogens. In this
study, the fermentation of E. coli was examined in different pH conditions (pH 1, 3, 5, 7, and 9) at
36 ºC for 24 and 48 hours by measuring gas production. The hypothesis being tested is that gas
production during E. coli fermentation under different pH conditions will be significantly different.
As a result, the gas production in pH 1 was 0.14 ± 0.02 (±se) mls: 0.02 ± 0.02 (±se) mls in pH 3, 0.69
± 0.12 (±se) mls in pH 5, 0.56 ± 0.13 (±se) mls in pH 7, and 0.64 ± 0.13 (±se) mls in pH9. Gas
productions was significantly different between different pH groups (p=0.0002