The term "specific chemicals" refers to a particular group or category of chemical substances that have specific characteristics and properties. Full definition
They have also discovered that the electron beam can be simultaneously tuned to stimulate specific chemical reactions by using it as a source of energy as well as an imaging tool. (sciencedaily.com)
The site also provides tips for specific chemicals to look out for and avoid in each age group. (theselightfootsteps.com)
With an existing method, they used specific chemical signals to «guide» the stem cells into becoming cells that have the potential to become sperm. (sciencedaily.com)