BSC 114 Chapter Notes - Chapter 6: Fibronectin, Integrin, Plant Cell
20 Sep 2016
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Section 6. 1: biologists use microscopes and the tools of biochemistry to study cells. Microscopes were invented in 1590 and further defined during the 1600s. Light microscope (lm)- visible light is passed through the specimen then through glass lenses. Resolution- a measure of the clarity of the specimen. Inversely related to the wavelength of the light. Contrast- the difference in brightness between the light and dark areas of an image. Organelles- the membrane-enclosed structures within eukaryotic cells. Electron microscope- focuses a beam of electrons through the specimen or onto its surface. Scanning electron microscope (sem)- especially useful for detailed study of the topography of a specimen o. Electron beam scans the surface of the sample. Excites electrons on the surface, and these secondary electrons are detected by a device that translates the pattern of electrons into an electronic signal sent to a video screen.
