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.
A child's hearts normally beat faster than an adult's. A healthy adult heart rate can range from 60 to 100 beats per minute during rest. Kids' heart rates can be as low as 60 beats per minute during sleep and as high as 220 beats per minute during strenuous physical activity. It's normal for athletic kids to have slower resting heart rates, often in the 40s or 50s.