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Introduction There are times in our lives as human beings when people do not feel well A doctor might diagnose them with a disease or an infection There are also times when people do not feel clean This could be a persons feeling after exercising sweating or maybe heshe had not taken a shower in a couple days In any of the preceding scenarios bacteria most likely played a major role in initiating a persons feeling of illness or squalor Sickness can be caused from bacteria Someone may be sick because they ate food contaminated with bacteria or they could have easily taken a sip from the cup of a friend and shared some sort of bacterial disease Bacteria surrounds us everyday every second It is difficult for people to accept this fact because they want to believe they are clean after they shower In relative terms a washed person is clean but they are not free of bacteria Clean is simply an image because bacteria are covering all substances and objects tha t you use to be clean toothbrushes soap and even toilet paper We live in a world of bacteria maybe even a world that evolved from bacteria These microscopic organisms reproduce quickly sometimes even exponentially In the experiment today my class is observing and measuring data of how different factors can influence the rate at which bacteria grows We will use Escherichia coli E coli as our bacteria It is a Gram-negative bacterium that resides in the intestines of humans Laboratory Experiences 34 Before you can fully understand the experiment and it purpose it is important to understand the phases bacteria go through when reproducing in various media In general a bacterial will go through four distinct phases a lag phase log phase stationary phase and a death phase The lag phase shows how bacteria reproduce at a very slow rate at first At this point the cells are preparing
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