Spot the difference puzzles are sometimes known as 'Photo hunt' games. The goal is to find a number of differences between two near-identical images, which may be drawings, computer graphics, or photographs. SpotTheDifference.com offers you a massive selection of puzzles and games at all levels of difficulty.
The catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, is produced by bacteria that respire using oxygen, and protects them from the toxic by-products of oxygen metabolism.he catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, is produced by bacteria that respire using oxygen, and protects them from the toxic by-products of oxygen metabolism.
The ANA, or antinuclear antigen, is a blood test for a cell antigen, or protein. It is a screening test that is reported as either positive or negative. If the it is positive, then the lab performs what is called a reflex to titer, which is a test that determines how strong the result is. For example, if the ANA is positive, then the titer may be reported as 1:40, which is weak, or as 1:320, which is strong.