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Funds for research were insufficient. The source of illumination was not bright enough until recently. Materials used to manufacture X-ray tubes were difficult to obtain. X-ray microscopes were too complicated to operate.
see viruses directly develop the electron microscope later on understand more about the distribution of the chemical elements discover single-celled plants anal animals they had never seen before
Transmission(透射) electron microscope Scanning electron microscope Differential centrifugatioin(差速离心) X-ray crystallography
The detail seen through a microscope. Sources of illumination for microscopes. A new kind of microscope. Outdated microscopic techniques.
They will probably replace electron microscopes altogether. They will eventually he much cheaper to produce than they are now. They will provide information not available from other kinds of microscopes. They will eventually change the illumination range that they now use.
To begin a discussion, of sixteenth-century discoveries. To put the X-ray microscope in a historical perspective. To show how limited its uses are. To explain how it functioned.
Combustion gases flow through the tubes Flames impinge on the tubes Combustion occurs in the tubes Water flows through the tubes
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