one of a group of cells that develop in the walls of the seminiferous tubules. Spermatogenic cells include spermatogonia, spermatocytes, and spermatidsâall of which are transitional forms between primary sexual cells and spermatozoa.
long-haul optics. Long-haul optics refers to the transmission of visible light signals over optical fiber cable for great distances, especially without or with minimal use of repeaters. Normally, repeaters are necessary at intervals in a length of fiber optic cable to keep the signal quality from deteriorating to the point of non-usability. In long-haul optical systems, the goal is to minimize the number of repeaters per unit distance, and ideally, to render repeaters unnecessary.
Over the Road/Long Haul Truck Drivers Over the road (OTR) truck drivers, also commonly referred to as long haul truck drivers, are usually interstate drivers, traveling hundreds or thousands of miles on the road for days or weeks at a time. Some OTR drivers are intrastate drivers, meaning they travel within one state.