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.
When untreated, atrial flutter often leads to a rapid heart beat. During atrial flutter, the atrium can beat up to 300 times a minute, and every second beat gets through to the ventricle, resulting in a pulse rate in the range of 150 beats per minute (the normal heart beat is 60 to 90 beats per minute).