Welcome to Biological Science Advanced Studies. This site is designed for biology students of A-level, AS and A2, covering the related topics in Biology and Human Biology.
The electron microscope is first removed of air. The electron is beamed and inteferes with the specimen. The electrons are emitted by cathode and accelerate by annode, they absorb or pass through specimen and collected on florescent or film. The pictures are 3D and come in black and white.
SAM
the electron beam is directed onto a sample. the electrons dont pass through specimen.
they are bounced off the sample
the final image in 3D the maginfication is X100 000
TEM
the electron beam passes through the sample.
electrons pass throgh the denser parts less easily giving contrast to the image
the image is 2D
maginfication is X500 000
The electron microscope is first removed of air. The electron is beamed and inteferes with the specimen. The electrons are emitted by cathode and accelerate by annode, they absorb or pass through specimen and collected on florescent or film. The pictures are 3D and come in black and white.
SAM
the electron beam is directed onto a sample. the electrons dont pass through specimen.
they are bounced off the sample
the final image in 3D the maginfication is X100 000
TEM
the electron beam passes through the sample.
electrons pass throgh the denser parts less easily giving contrast to the image
the image is 2D
maginfication is X500 000