Specific application of UV analyzer

The application of ultraviolet analyzer to fluorescence technology, the application of ultraviolet analyzer in biochemistry and molecular biology research mainly includes the following aspects: 1. Qualitative of substances: Different fluorescent substances have different excitation and emission s---

How much stapler knowledge

In 1869, Thomas Briggs of Boston, Massachusetts, invented a machine that could break a wire and bend it into a U shape, then use it to nail the pages, and finally bend it to properly hold the book. it is good. In 1894, he used a manufacturing process in which the iron wire was first rolled and be---