|
Diatom Genera
A diatom (Neo-Latin ''diatoma''), "a cutting through, a severance", from el, διάτομος, diátomos, "cut in half, divided equally" from el, διατέμνω, diatémno, "to cut in twain". is any member of a large group comprising several genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and constitute nearly half of the organic material found in the oceans. The shells of dead diatoms can reach as much as a half-mile (800 m) deep on the ocean floor, and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by transatlantic winds from the African Sahara, much of it from the Bodélé Depression, which was once made up of a system o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Dangeard
Pierre Jean-Louis Dangeard (18 February 1895 in Poitiers, France – 23 August 1970 in Pléneuf-Val-André, France) was a French Botany, botanist. He was the son of botanist and Mycology, mycologist Pierre Augustin Dangeard and brother of geologist and Oceanography, oceanographer, Louis Dangeard. Biography Pierre Dangeard was born on 18 February 1895 in Poitiers, France. Four years earlier his father had relocated from Caen to take up a botany professorship at the ''Académie des Sciences'', the scientific faculty of the University of Poitiers, and a year after his move, had married the 20-year-old Henriette Louise Labrosse. Dangeard was the second of four siblings. His elder brother Henri died in 1899 at the age of six. Pierre thus became the eldest of the children and followed in his father's footsteps to become a botanist. In 1909 the family moved to Paris after Dangeard's father was offered and accepted a position at the prestigious ''Académie des Sciences''. After re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
