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.
Product Description. The Long Haul is an innovative product that extends the bed of a truck so that much more can be carried. The Long Haul makes it possible to carry materials up to 16 feet long in a regular truck. With The Long Haul, the need for a trailer is gone. Trailers are expensive, hard to navigate, and burdensome to store.