New mutants of Phycomyces blakesleeanus for B-Carotene production

Article Abstract:

Microbiological research shows that genetically mutated zygomycete Phycomyces blakesleeanus produce beta-carotene. Modifications to the carS gene were made using N-methyl-N'-nitrosoguanidine. Around nine milligrams of beta-carotene per gram of dry mass were produced from genetically-modified strain S556 microorganisms. As much as 33 milligrams of beta-carotene were produced when carS mutants are crossed with carF segregants. Beta-carotene production increases markedly during the later stages of the growth cycle.

Gene mutations, Gene mutation, Genetic aspects, Beta carotene, Mucormycosis

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Comamonas testosteroni colony phenotype influences exopolysaccharide production and coaggregation with yeast cells

Article Abstract:

The colony phenotype of the Comamonas testosteroni strain affects exopolysaccharide production and coaggregation with yeast cells due to the mucoid- vs nonmucoid-colony forming activities of the phenotype. Exopolysaccharide production in this strain is unstable and yields either mucoid or nonmucoid colonies. The absence or presence of environmental factors such as chemical and nutritional stress, determine the dominance of mucoid-colony forming or nonmucoid-colony forming activities.

Phenotype, Phenotypes, Yeast fungi, Yeasts (Fungi)

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Exopolysaccharide-producing bacteria from sugar beets

Article Abstract:

Research was conducted to examine exopolysaccharide-producing bacteria from sugar beets. Microorganisms were isolated from sugar beets collected from different parts of Finland. The samples, which were obtained from the inside or surface of the beet were streaked onto agar plates. Results showed that 170 of the 600 samples yielded exopolysaccharides, wherein 35% were heteropolysaccharides. Five isolates were classified as Leuconostoc mesenteroides.

Microbial polysaccharides, Sugar beets, Sugar beet

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