نتایج جستجو برای: chemostats
تعداد نتایج: 252 فیلتر نتایج به سال:
The veterinary use of antimicrobial drugs in food producing animals may result in residues in food, that might modify the consumer gut flora. This review compares three model systems that maintain a complex flora of human origin: (i) human flora associated (HFA) continuous flow cultures in chemostats, (ii) HFA mice, and (iii) human volunteers. The "No Microbial Effect Level" of an antibiotic on...
The effect of the growth rate and oxygen transfer rate on Debaryomyces hansenii physiology was studied using xylose-limited and oxygen-limited chemostat cultures respectively, and complemented with enzymatic assays. Under xylose-limited chemostat (oxygen-excess) neither ethanol nor xylitol was produced over the entire range of dilution rate (D). The maximal volumetric biomass productivity was 2...
To evaluate microbiological safety of tulathromycin on human intestinal bacteria, tulathromycin (0, 0.1, 1, 10, and 100 μg/mL) was added into Chemostats. Before and after drug exposure, we monitored (1) population, SCFA products, antimicrobial resistance, and colonization resistance of gut microbiota, and (2) the antimicrobial resistance genes, transferability, virulent genes, pathogenicity of ...
Here we present results from laboratory experiments using Pseudo-nitzschia spp. isolated from Monterey Bay, California grown under constant temperature and irradiance. We demonstrate substantial clonal variability and variable toxicity depending on harvest time and nutrients. We also show that Si limitation can directly affect photosynthetic performance and looks functionally like iron and nitr...
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