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.
Subsidiary of Norwegian Air Shuttle, Norwegian Long Haul has initiated routes to Bangkok, transatlantic routes to New York City and Fort Lauderdale in 2013 and will expand in 2014 with routes to Los Angeles, Oakland / San Francisco and Orlando (Florida), all from Scandinavia.