Cell Cultivations
The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of

600-700nm
300-400nm
400-500nm
500-600nm

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Cell Cultivations
The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because

they lack murein in their cell wall
All of these
they contain 80S, as opposed to 70S, ribosomes
they contain ether-linked isoprenoids in their plasma membrane

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Cell Cultivations
Balanced growth is defined as

cultures undergoing balanced growth while maintaining a constant chemical composition
balancing the growth while controlling the temperature
balancing the growth while changing the nutrient composition
balancing the growth while controlling the pH

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