Hence the name. In the past, the main disadvantage of asynchronous induction motors was the difficulty of varying their speed. That is no longer an issue, thanks to modern semiconductor controls.

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However, the highest IL-10 level was observed at day 40 in BBDR rats, compared with day 60 in BBDR.lyp/lyp rats, indicating asynchronous induction of regulatory components in the two BB sub-strains.