Electron Microscopy 1 PDF

Preview

Summary

Notes on Electron Microscopy Biology A-Level OCR A...

Description

Electron Microscopy (1)  The light microscope is not the only type of microscope used by biologists.  By the 1950s biologists had developed two other types of microscope: the electron microscope and the laser scanning confocal microscope.  Each microscope type has its strengths and weaknesses, and tends to be used to observe different things. Types of Electron Microscopes There are two types of electron microscopes: Transmission electron microscope (TEM)  Electron pass through and around the specimen, giving some contrast - the image is 2D with magnification of x500,000 Scanning electron microscopes (SEM)  Electron do not go through or pass around the sample but reflect off – the image is 3D with magnification of x100,000 Colored Images  All electron microscopes cannot see in color because, unlike light microscopes, there is only one wavelength transmitting (electrons)  The color has to be ‘educatedly’ guessed at and then added...