A judge has been expected to rule in a court battle between Penney and Macy's over whether Macy's has an exclus | ASSOCIATED PRESS. 24/7 Wall St. : Brick-and-mortar retailers have been suffering from slow economic activity for years, as well as from increased competition from online retailers. The rise in store closings is a prominent sign of their struggles.
Gel electrophoresis is one of the principal tools of molecular biology. The basic principle is that DNA, RNA, and proteins can all be separated by means of an electric field and size.
An electron microscope uses electrons to observe the structure and morphology of things at small scales (down to a fraction of a nanometer). The main types of electron microscopes are the Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and the Scanning Transmission Microscope (STEM). Electron microscopes have a wide range of applications in science and technology. To unlock this lesson you must be a Study.com Member.