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.
Tools Used by Scientists. Scientists use complex and precise tools to perform research. In the field, scientists use highly accurate measuring devices to find data about how a system or process works. To record and analyze the data they find, scientists often use powerful software programs and computers. Depending on the type of research they do, scientists may use dozens of tools in the course of one research project. (michaeljung/iStock/Getty Images)