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When it is "on", the rotating magnet has its N pole in one half of the base, and the S pole in the other half. The two halves of the base plus the rotating magnet form a sort of horseshoe magnet. When its attached to a piece of metal (across the two halves of the base) it makes a magnetic circuit which it is very strong.
These two steps have different reaction rates, the first one is reversible and faster than the second reaction, which is slower, so this means that the determining step is the second reaction and this is used to determine the observed reaction rate.
There are two series of essential fatty acids: one has a double bond three carbon atoms away from the methyl end; the other has a double bond six carbon atoms away from the methyl end. Humans lack the ability to introduce double bonds in fatty acids beyond carbons 9 and 10, as counted from the carboxylic acid side. [ 35 ]