prototrophism

English[edit]

prototrophism (uncountable)

(microbiology) Reversion to the growth factor requirements of an ancestral strain.
- 1962, Nikolaĭ Petrovich Dubinin, Problems of Radiation Genetics, page 275:
  Berrie [ 254 ] found that the incubation temperature of the colon bacillus has an influence on the incidence of the mutations returning to prototrophism and streptomycin independence
- 1992, Soviet Genetics - Volume 28, Issues 1-6, page 173:
  These strains enable recording of reverse mutations from auxotrophism on tryptophan to prototrophism .
- 2014, Antoon D. L. Akkermans, Jan Dirk Van Elsas, Frans J. De Bruijn, Molecular Microbial Ecology Manual:
  Auxotrophic mutant strains are readily obtained but they should always be tested for reversion to prototrophism before use.
The ability to obtain nourishment from a single source, such as iron, sulfur, or sunlight or to undergo anabolism.
- 1934, Marcus M. Mason, A Comparison of the Maximum Growth Rate of Various Bacteria Under Optimal Conditions, page 7:
  Bacteria vary greatly in their food requirements from extreme examples of prototrophism and autotrophism to extreme parasitism.
- 1969, Giuseppe Sermonti, Genetics of Antibiotic-producing Microorganisms, page 144:
  The segregation of some markers ( as, for instance, a nutritional requirement versus prototrophism ) is evident only after the examination of the clones derived from the single spores, but the allele segregation has in any case occurred before spore formation.