Uteshev is a family name of Kazakh origin.
| This disambiguation page lists articles associated with the title Uteshev. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism. External fertilization typically occurs in water or a moist area to facilitate the movement of sperm to the egg. The release of eggs and sperm into the water is known as spawning. In motile species, spawning females often travel to a suitable location to release their eggs. However, sessile species are less able to move to spawning locations and must release gametes locally. Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce. Environmental factors and timing are key challenges to the success of external fertilization. While in the water, the male and female must both release gametes at similar times in order to fertilize the egg. Gametes spawned into the water may also be washed away, eaten, or damaged by external factors.
Veniamin Efimovich Basner was a Russian composer. He was recognized by the Soviet Union as a People's Artist of Russia and a State prize-winner. An asteroid called 4267 Basner, discovered in 1971, was named in his honour. He was a member of the St Petersburg Union of Composers.
Carl L. Faingold, Ph.D. is a neuroscientist, a Distinguished Professor in the Department of Pharmacology of Southern Illinois University School of Medicine in Springfield, Illinois; he is a founding faculty member of both the department and the School of Medicine. He has had an extensive career as a medical and graduate student educator as well as a researcher into brain mechanisms. He is a specialist in the actions of drugs on brain activity at the level of the single neuron as it relates to networks of neurons in awake behaving animals.