A toxin is a substance that is poisonous. Toxins are produced during the biological processes of living organisms. They are inherently toxic and immunogenic. Toxicity of the toxins can be altered or inactivated, and vaccines can be made from toxins to treat diseases; these are known as toxoids...
Another difference between psychrophiles and psychrotrophs is that psychrophiles are found in constantly cold environments, while psychrotrophs are found in seasonally cold environments. Moreover, psychrophiles grow well at 00C. Psychrotrophs also grow at 00C, but they do not grow very we...