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andrwisawesome0
20.01.2021 •
Biology
Cultures of a bacterial species were placed in an incubator at 370 C, in an anaerobic jar and in a CO2 incubator. After incubation there was scant growth of cultures in the CO2 incubator and anaerobic jar, but heavy growth of the culture on the incubator shelf. This species is a/an:
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Ответ:
Bacillus anthracis, the causative agent of the human disease anthrax, Bacillus cereus, a food-borne pathogen capable of causing human illness, and Bacillus thuringiensis, a well-characterized insecticidal toxin producer, all cluster together within a very tight clade (B. cereus group) phylogenetically and are indistinguishable from one another via 16S rDNA sequence analysis. As new pathogens are continually emerging, it is imperative to devise a system capable of rapidly and accurately differentiating closely related, yet phenotypically distinct species. Although the gyrB gene has proven useful in discriminating closely related species, its sequence analysis has not yet been validated by DNA:DNA hybridization, the taxonomically accepted "gold standard". We phylogenetically characterized the gyrB sequences of various species and serotypes encompassed in the "B. cereus group," including lab strains and environmental isolates. Results were compared to those obtained from analyses of phenotypic characteristics, 16S rDNA sequence, DNA:DNA hybridization, and virulence factors. The gyrB gene proved more highly differential than 16S, while, at the same time, as analytical as costly and laborious DNA:DNA hybridization techniques in differentiating species within the B. cereus group.
Explanation:
Ответ:
by Using 'quarter' for 15 minutes before or after the hour or having the time set on 5:00pm for example and doing the math on what time it would be 2 hours from now past 12.
Explanation: I hope that makes sense! You could also look it up for more information on what it means or I could help you with that as well<3