The halogen gas inside a halogen lamp causes the evaporated tungsten to redeposit on the filament. This process, along with high pressure inside the capsule, slows down deterioration of the filament, improves lumen maintenance and extends the lampâs service life.
The mean heart rate as obtained in this study (246 beats min â1, with a range of 207â314 beats min â1) is within the range given by several authors in chicken embryos. In a previous study () we reported heart rate values ranging between 250 and 270 beats min â1 on days 19 and 20 of incubation.
The normal rate for an adult is 60 to 80 beats per minute. Women have a slightly higher average rate than men. The pulse of an infant ranges from 120 to 140 beats per minute. Rates for children vary according to the size and the age of the child. normal pulse for infants range from 90 to 170 and the rate gradually decreases up to age 14 when it is equal to the normal adult pulse rate of 60 to 100. b. Body Build and Size. A short, fat person may have a higher rate than a tall, slender person.