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.
Up to 180 beats per minute may be normal until a year of age. Large adult dogs can have a resting heart rate of 60 to 100 beats per minute, while small adult dogs can have a normal heart rate of 100 to 140 beats per minute. Heart rate can increase with normal exercise or emotional responses like excitement or stress.