An aldehyde differs from a ketone because of its hydrogen atom attached to its carbonyl group, making aldehydes easier to oxidize. Ketones don't have a hydrogen atom bonded to the carbonyl group, and are more resistant to oxidation.
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WGS-84 is a world wide datum and is the master datum for use with a gps. Garmin always stores internal information in this datum. The origin is the center of the earth and then a ellipse is defined using the major and minor axis.ime is used in your gps to calculate position. The time used by your gps is a special gps time that is transmitted as part of the satellite message. In addition the satellite transmits information in the form of leap seconds adjustments to permit your unit to adjust the clock display to agree with standard UTC time.