The words contained in this file might help you see if this file matches what you are looking for:

...Electron microscopy em is an beam which focused into a small probe across the surface of specimen first electromagnetic lens was developed in by hans busch microscope follows same principle compound but uses electrons as illumination source instead light microscopes allow biologists to explore cells more details observe organelles such mitochondria ribosomes endoplasmic reticulum er golgi apparatus and lysosomes heavy metals lead are used stain prior examine via visible than surrounding cytoplasm defects cell s easily seen scientific laboratories many industries forensics nanotechnology mining disadvantages it large machines training required very expensive specimens lot preparation mounted plastic means that only dead can be viewed there two types scanning sem mode action for similar however beams behave like waves focus using magnetic field rather ordinary lenses metallic coating biological achieve up x magnification resolution components electrical not optical materials glass optics...