CAUTION: Federal (U.S.A.) law restricts this drug to use by or on the order of a licensed veterinarian. DrontalÂ® Plus Taste TabsÂ® (praziquantel/pyrantel pamoate/febantel) Broad Spectrum Chewable Anthelmintic Tablets for Dogs are available in three tablet sizes. Each size is scored for convenient oral administration.
Ozone is also destroyed naturally in the stratosphere, being dissociated by ultraviolet radiation: This is the reaction that is responsible for O3's absorbtion of uv radiation that would otherwise reach earth.
Stratospheric ozone is natu-rally formed in chemical reactions involving ultravioletsunlight and oxygen molecules, which make up 21% ofthe atmosphere. In the first step, sunlight breaks apartone oxygen molecule (O 2) to produce two oxygen atoms(2 O) (see Figure Q2-1).n the strat-osphere, the process begins with an oxygen molecule (O 2) being broken apart by ultraviolet radiation fromthe Sun. In the lower atmosphere (troposphere), ozone is formed in a different set of chemical reactionsinvolving hydrocarbons and nitrogen-containing gases. Stratospheric Ozone Production.