BIOL 2051 Chapter Notes - Chapter 2: Diplococcus, Spiral Bacteria, Lf-Space

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18 Jun 2014
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Size of prokaryotes: prokaryotes are generally smaller than eukaryotes, small size allows nutrients to reach all parts of cell quickly, prokaryotic cells can be as small as 0. 2 m. The smallest eukaryotic cells are 2 m: cocci - typically have diameter of 2 m, some microbiologists have proposed that bacteria smaller than 0. 2 m exist in nature, cells referred to as nanobacteria. Bacterial shapes: simplest shape is sphere, singular-coccus, plural-cocci, arrangement: Microscopy: simple microscopes, one lens (like a magnifying glass, magnify 50 300x, compound microscopes, multiple lenses, much higher magnification. 3 ability to distinguish between 2 objects that are close together. Correct each other"s: use shorter wavelength. Blue light is shortest wavelength so gives highest resolution. Increase numerical aperture (measure of the light gathering ability of objective lens) Immersion oil (special oil with same refraction as glass) Light bends as it passes through specimen into air- reduces resolving power.

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