"After Life," "Sperm," "Cities," "Time," "Patient Zero," "Deception," are typical episode titles, and these concepts are elaborated on by Abumrad and Krulwich with seeming spontaneity (this is an illusion, of course — each hour-long episode is tightly edited over the course of six weeks; new episodes will air on public radio throughout the summer).
Two weeks ago, Dennis Publishing began publishing The Week, a quirky news digest that features headlines like "The threat of global warming" along with "The shelf life of sperm" and "Do stupid people die sooner?" (The answer, according to The Week, is yes).
The album opens in suitably droll manner with "Race Of Life", a sperm's story of how he "pulled that one out of the bag" (ahem) and beat his wriggly chums to the egg.
If females mate just once in their life, storing sperm for subsequent reproduction, then wave speed depends on the movement of mated females as well as Y-drive males, and may be faster or slower than in the multiple-mating model, depending on the relative duration of juvenile and adult life stages.
Also in a Swedish freshwater stickleback population the mean life span of sperm in freshwater was 30s with single sperm surviving up to 60s [ 24].
Accessory glands, providing fluids that lengthen the life of the sperm, open into the vasa deferentia.
For Dr. Prentice, life begins when sperm and egg are joined, and a new genome is created.
The epididymis secretes substances that prolong the life of stored sperm and increase their capacity for motility.
It may be fine for normal life, but this sperm has to be frozen and the thawing can kill it.
Scheffer, an American biologist, fictionalised a year in the life of a sperm whale calf, interwoven with observations on these fascinating cetaceans.
And a female shark once gave birth after six years in captivity.So far, the two researchers have identified a promising mixture of proteins, with the unwieldy name of sAPM, which can prolong the active life of ram sperm by several hours, and they hope to tweak this mix to improve its performance.
