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.
1 The resting adult heart rate is normally 60 to 100 beats per minute. 2  Athletes or people on certain medications may have a lower resting normal rate. 3  The normal heart rate for children aged 1 to 8 years is 80 to 100 beats per minute.  The normal heart rate for infants age 1 to 12 months is 100 to 120 beats per minute.