21. In some experimental regimes, some of the bacterial culture is periodically removed and added to fresh sterile medium. 22. It's also not soured by a bacterial culture ; it's soured by adding either tartaric acid or lemon juice. 23. Clinical diagnosis of " H . influenzae " is typically performed by bacterial culture or latex particle agglutinations. 24. The cheese is typically aged between 12 and 52 weeks in rectangular blocks of, coated with a bacterial culture . 25. For single-celled eukaryotes, such as yeast, the isolation of pure cultures uses the same techniques as for bacterial cultures . 26. They are produced in Austria by Gegenbauer, using a special bacterial culture and aged in oak barrels for eight years. 27. "Then do you have any Cheez Wiz ? " asks Bossy, explaining that it's a delicious creamy orange bacterial culture . 28. Thus, they are responsible for maintaining the stability and viability of the bacterial culture throughout the product s shelf life. 29. However diagnosis should be confirmed using laboratory tests such as bacterial culture , PCR, agar gel precipitation, ELISA and serum agglutination. 30. Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24 48 hours before performing the test.