Our tissues as well as many microorganisms are catalase positive - thats why the bubbles when you pour peroxide on a cut. Organic growth factors commonly called vitamins, these are organic substances required for the growth of an organism but which the organism can not synthesize. Bacterial Growth Bacteria grow by binary fission. Starting with one organism how many organisms would you have after 1,2,3,4,5,6,7,8,9,10,11,12 generations. List examples of both kinds of control.
Negative control refers to disinfection , antisepsis and sterilization .
All are powerful disinfectants. Alcohols remove lipids and disrupt cell membrane. Good for washing skin. Kills vegetative bacterial cells and enveloped viruses well. Not effective on endospores and non-enveloped viruses.