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10 nanoseconds, also a casual term for a short period of time. microsecond: 10 −6 s: One millionth of a second. Symbol is μs millisecond: 10 −3 s: One thousandth of a second. Shortest time unit used on stopwatches. jiffy (electronics) ~ 10 −3 s: Used to measure the time between alternating power cycles. Also a casual term for a short ...
1 fs: The cycle time for ultraviolet light with a wavelength of 300 nanometres; The time it takes light to travel a distance of 0.3 micrometres (μm). 7.58fs: The period of vibration of a hydrogen molecule. 140 fs: The time needed for electrons to have localized onto individual bromine atoms 6 Ångstrom apart after laser dissociation of Br 2. [11]
Gestational age is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual fertilization. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization. Nevertheless, menstruation has historically been the only means of ...
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The perinatal period (from Greek peri, "about, around" and Latin nasci "to be born") is "around the time of birth". In developed countries and at facilities where expert neonatal care is available, it is considered from 22 completed weeks (usually about 154 days) of gestation (the time when birth weight is normally 500 g) to 7 completed days ...
This special time period is called "full term". [63] Whenever possible, waiting for labor to begin on its own in this time period is best for the health of the mother and baby. [17] The decision to perform an induction must be made after weighing the risks and benefits, but is safer after 39 weeks. [17] Events after 42 weeks are considered ...
The odds of a quintuplet pregnancy are 1 in over 50 million. Even with IUI, the odds of quintuplets are still exceedingly rare, since five mature follicles would (in theory) have been seen prior ...
Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [15] For optimal pregnancy chance, there are recommendations of sexual intercourse every 1 or 2 days, [ 16 ] or every 2 or 3 days. [ 17 ]
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