Because a colony on plate could be formed by more than one cell.
Introduction to basic techniques in microscopy involves light microscopy, laser scanning, types of dyes, the cell, electron microscopy, differential interface microscopy, histological stains and histochemical stains.
Dark field microscopy (dark ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image. As a result, the field around the specimen (i.e. where there is no specimen to scatter the beam) is generally dark.
Transmission electron microscopy
No
Transmission electron microscopy
Field Emission Scanning Electron Microscopy
Microscopy Society of America was created in 1942.
Depending on what microscopy you are doing.. Bacterial microscopy starts with 40x and Blood smear microscopy at 10x.
Robert F. Bils has written: 'Electron microscopy' -- subject(s): Electron microscopy, Laboratory manuals, Microscopy, Electron
The term "fluorescence microscopy" is a type of light microscopy in which the specimen is irradiated at wavelengths that excite fluorochromes. In medicine, it is used to detect antigens.
Electron microscopy gives higher resolution, but it's expensive, slow, and cumbersome. And for many things, it's not needed.