The first issue to get settled is that the shape of a bacterium has biological relevance. Portions of this topic have also been discussed by Beveridge, Dusenbery, Koch, and Mitchell. More depth, more examples, and a bit more quantitative treatment can be found in a recent review and the references therein. I will highlight a few research areas that bear on why bacteria have certain morphologies, but only in a brief and qualitative way. What has not been as well explored is why bacteria find it advantageous to exhibit such a prodigious number of different shapes and so the purpose of this article is to examine some of the reasons that lie behind this variety. And, indeed, this approach has produced exciting new information, highlighted by other articles in this issue. This emphasis is understandable because we are both more familiar with and more comfortable with answering how-type questions. The expectation is that by answering this (deceptively) simple question we may acquire knowledge that will point us to a universal mechanism of shape control. Keywords: Coarse Extract, Earthworms, Pheretima sp., Morphological Cells, Salmonella enteritidis, Scanning Electron Microscope (SEM).The discussion of bacterial morphology has been dominated by questions about how a cell manages to create a rod shape, which, of course, is but one example of the more general question of how a cell constructs any shape. However, 5% extract concentration is the optimal concentration in the effect of damage to the morphology of the cells of Salmonella enteritidis bacteria. against Salmonella enteritidis bacteria, the greater the damage caused. In addition, as well as longer contributions and free time, incubation, after being added, crude extract of Pheretima sp. Salmonella enteritidis bacterial cells are damaged consisting of: formed holes in the surface of bacterial cells, bumps on the surface of bacterial cells, shrinkage of bacterial cells, elongation of bacterial cells, and increase in bacterial cells. to changes in cell morphology of Salmonella enteritidis bacteria. Obtained from the results showing the crude extract of Pheretima sp. Observations using a microscope scanner were carried out after agreeing to a 6-hour, 12-hour, and 24-hour extract. Earthworm extraction uses 96% ethanol, and binds to the appropriate bacteria in the exponential phase with extract concentrations of 5% and 10%. using a scanning electron microscope (SEM). This study was aimed at studying changes in the morphology of Salmonella enteritidis bacterial cells after the crude extract of Pheretima sp.
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