Bacterium have a internal structure that is more complicated than it seems at first. The first part of the bacterium is the plasma membrane which is a selectively permeable barrier that is the boundary of the cell. (Prescott 40) The next portion of a bacterium is the cytoplasmic matrix. The cytoplasmic matrix is the substance lying between the plasma membrane and the nucleoid. (Prescott 45) Although it is generally featureless in a microscopes it can be packed with ribosomes and is generally highly organized. (Prescott 45) The next one is the nucleiod of a bacterium.(Prescott 40) This is the area within a bacterium in which the genetic material of the cell is located. (Prescott 49) The n

The method usually used for estimating the growth of bacteria is the " viable count" method. (Stephenson 50) When the total count of the bacteria is plotted against time it shows a growth curve. (Stephenson 50) Such curves are divided into eight differing phases.(Thimann 623) The first phase of the growth curve is an initial stationary phase in which no growth occurs. (Thimann 623) The second phase is one of an increasing rate of growth these first two phases constitute the lag phase. (Thimann 623) The reason for the lag phase is this when you first put bacteria in a culture they need time to get into a state of growth called the embryonic stage. (Thimann 625) This stage can be identified by observing the cells. The bacteria grow to a greater size than normal. (Thimann 625) The third phase is called the logarithmic growth stage.(Stephenson 50) During logarithmic growth stage the rate of increase remains constant and the cell size returns to normal. (Stephenson 50) The fourth phase is one of decreasing cell growth with many cells dying off. (Thimann 623) The fifth phase of cell growth is where the cells reach the maximum population of bacteria that the medium can support with growth and death balanced out. (Thimann 624) The sixth phase is one of increasing death rate. (Thimann 624) The seventh phase is the "logarithmic" death phase which is the inverse of the logarithmic growth phase. (Thimann 624). The

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Approximate Word count = 954
Approximate Pages = 4 (250 words per page double spaced)