Cultures in an embryonated hen’s egg
Important sites of growth for viruses, chlamydiae (bedsoniae), and rickettsias are the yolk sac and the embryonic membranes of the developing chick embryo. Bacteria are occasionally grown in this way and then examined using compound binocular microscopes.
Cultivation of microbes in cell cultures
Cell (tissue) cultures are composed of animal cells in […]

Media that by virtue of their ingredients distinguish organisms growing together are differential media. Examples include eosin-methylene blue (EMB) agar and MacConkey agar, used in the differentiation of the gram-negative bacteria of the intestinal tract. The incorporation of lactose into such differential media makes possible a sharp separation in colonial characteristics between the organisms that […]

INTERRELATIONS
Symbiosis
Certain species of bacteria grow well together, and the associated species accomplish harm¬ful or beneficial results that neither does alone. For instance, the staphylococci and influenza bacilli that can be seen using a compound binocular microscope, multiply more rapidly when grown together than either does when grown alone. This is known as synergism.
Symbiosis refers […]