MICRO CH2

MICRO CH2 - In library on first floor at reserve desk:...

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In library on first floor at reserve desk: MICROBIOLOGY: An Evolving Science- call number is RX52 Circulates 2hrs BUILDING USE ONLY Chapter 2: Observing the Microbial Cell 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 0.2μm. The smallest eukaryotic cells are 2μm. Cocci- typically have diameter of 2 µm Some microbiologists have proposed that bacteria smaller than 0.2 μm exist in nature, cells referred to as nanobacteria If one considers the space needed to house all essential molecules of life, it is unlikely they could exist within a volume available in a cell less than 0.1 μm. Prokaryotic cells can have a wide variety of cellular morphologies, which are often helpful in identification. Bacterial Shapes 1. Simplest shape is o singular- coccus o plural- cocci Arrangement:
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o Coccus- single cells o Diplococcus- 2 cells o Streptococcus- chains of more than 2 cells o Staphylococcus- grapelike cluster of cells o Tetrads- packets of 4 cells 2. Most common shape is rods o Singular- bacillus o Plural- bacilli Occur singly or in chains 3. Spirals: most common Rigid spiral-shaped bacteria are called spirilla (singular - spirillum) Flexible spiral-shaped bacteria are called spirochetes Vibrio – curved rods Microscopy Simple microscopes o one lens o magnify 50 – 300X Compound microscopes o multiple lenses o Much higher magnification Ones in 2051 lab magnify 1000x Lens System of Compound Microscopes Condenser lens
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MICRO CH2 - In library on first floor at reserve desk:...

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