Topic
Growth medium
About: Growth medium is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 59171 citations. The topic is also known as: culture medium & culture media.
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TL;DR: The effects of decreasing oxygen concentration on growth, polypeptide pattern of newly synthesized proteins and ADH (E.C.1.1.) activity in intact roots of 2 d old wheat seedlings are described and that of rice roots in the same experimental conditions is compared.
31 citations
TL;DR: A combination of meat extract and sodium acetate was identified as a suitable replacement in growth medium for Sporosarcina pasteurii and reduced retardation by 75 % (as compared to yeast extract) without compromising bacterial growth, urea hydrolysis, cell zeta potential, and ability to promote calcium carbonate formation.
Abstract: Microbial-induced calcium carbonate precipitation has been identified as a novel method to improve durability and remediate cracks in concrete. One way to introduce microorganisms to concrete is by replacing the mixing water with a bacterial culture in nutrient medium. In the literature, yeast extract often has been used as a carbon source for this application; however, severe retardation of hydration kinetics has been observed when yeast extract is added to cement. This study investigates the suitability of alternative carbon sources to replace yeast extract for microbial-induced calcium carbonate precipitation in cement-based materials. A combination of meat extract and sodium acetate was identified as a suitable replacement in growth medium for Sporosarcina pasteurii; this alternative growth medium reduced retardation by 75 % (as compared to yeast extract) without compromising bacterial growth, urea hydrolysis, cell zeta potential, and ability to promote calcium carbonate formation.
31 citations
TL;DR: It is reported that the normally rod‐shaped bacterium Escherichia coli can form branched cells, and these were found in strains in which chromosome replication or nucleoid segregation was disturbed, e.g. in minB mutants, intR1 strains, and in strains exhibiting stable DNA replication.
Abstract: Summaryf
We report that the normally rod-shaped bacterium Escherichia coli can form branched cells. These were found in strains in which chromosome replication or nucleoid segregation was disturbed, e.g. in minB mutants, intR1 strains, and in strains exhibiting stable DNA replication. Often, chromosome DNA was found to be located in the branch point of the cells. The branching frequency was dependent upon the growth medium: in rich medium no branched cells were found, whereas in minimal medium containing acetate and casamino acids the frequency of branched cells was increased. The genetic background of the strains also affected the tendency to branch. Furthermore, electron microscopy of thin-sectioned branched cells revealed additional membrane-like structures, which were not observed in wild-type cells. Finally, the branched cells are compared with bacteria that normally branch, and probable causes for branching in E. coli are discussed.
31 citations
TL;DR: The effects of hydrochloric, citric, lactic,osphoric, phosphoric and malic acids in combination with potassium sorbate on the growth of Saccharomyces bailii, SacCharomyces acidifaciens, S. rouxii and S. bisporus were evaluated and a bacteriostatic relationship existed for the other acids employed.
30 citations
TL;DR: Electro-activated sweet whey, a potential prebiotic and antioxidant, could be used as active ingredient in manufacturing functional fermented dairy products after it was shown that EA-whey acts as an antioxidant in regards to cell membrane lipids oxidation by oxygen species and limited their adverse effect on probiotic bacteria during their growth.
30 citations