Lec 10 Bio.docx - Chapter6.1&6.2Lecture10:EukaryoticCells I...

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Chapter 6.1 & 6.2 – Lecture 10: Eukaryotic Cells  1 I. Studying Cells by Microscopy and Cell Fractionation The founders of modern cell biology used  electron microscopes  and  cell fractionation  techniques to dissect eukaryotic cells    Cells are usually too small to be seen by the naked eye, so microscopes were developed to visualize them There are two basic types: o Light microscopes o Electron microscopes II. Light Microscopy  In a  light microscope (LM) , visible light is passed through a specimen and then through glass lenses, which refract (bend) the light, so that the image is magnified Three important parameters of microscopy: o Magnification , the ratio of an object’s image size to its real size o Resolution , the minimum distance between two distinguishable points o Contrast , visible differences in brightness between parts of the sample
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Chapter 6.1 & 6.2 – Lecture 10: Eukaryotic Cells
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  • Summer '14
  • Electron Microscopes

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