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Encyclopedia > Prochlorococcus

Prochlorococcus is a genus of marine cyanobacteria that now includes some three dozen species, differentiated on the basis of their ribosomal DNA. Sallie W. Chisholm of the Massachusetts Institute of Technology, Robert J. Olson of the Woods Hole Oceanographic Institution, and "other collaborators" (according to the Scientific American article listed in the "References" section) gave the genus that name. It was originally assumed that Prochlorococcus was related to Prochloron and other chlorophyll b containing bacteria, called prochlorophytes, but it is now known that they form several separate lines of cyanobacteria. In biology, a genus (plural genera) is a grouping in the classification of living organisms having one or more related and morphologically similar species. ... The worlds oceans as seen from the South Pacific Ocean (from Okeanos, Greek for river, the ancient Greeks noticed that a strong current flowed off Gibraltar, and assumed it was a great river); covers almost three quarters (71%) of the surface of the Earth, and nearly half of the... Orders The taxonomy of the Cyanobacteria is currently under revision. ... Ribosomal DNA (rDNA) are sequences encoding ribosomal RNA. These sequences regulate amplification and transcription initiation and contain transcribed and nontranscribed spacer segments. ... The Massachusetts Institute of Technology, or MIT, is a university located in the city of Cambridge, Massachusetts, USA. MIT is one of the worlds leading research institutions in science and technology, as well as in numerous other fields, including management, economics, linguistics, political science, and philosophy. ... The Woods Hole Oceanographic Institution (WHOI) is devoted to scientific research and science- and engineering-education leading to MS and PhD degrees in oceanography and related fields. ... Scientific American is a popular-science magazine, published monthly since August 28, 1845, making it the oldest continuously published magazine in the United States. ...

Prochlorococcus may be most abundant organism on Earth.
Prochlorococcus may be most abundant organism on Earth.

Marine cyanobacteria are to date the smallest known photosynthetic organisms: Prochlorococcus is the smallest at just 0.5 to 0.8 micrometres across. Possibly they are also the most plentiful species on Earth: a rich drop of surface seawater may contain 100,000 cells. Prochlorococcus is ubiquitous between 40°N and 40°S and dominates in the oligotrophic (nutrient poor) regions of the oceans. The light harvesting pigment complement of Prochlorococcus is unique, consisting predominantly of divinyl derivatives of chlorophyll a (Chl a2) and b (Chl b2) and lacking monovinyl chlorophylls. Prochlorococcus occupies two distinct niches, leading to the nomenclature of the low light (LL) and high light (HL) groups, which vary in pigment ratios (LL possess a high ration of chlorophyll b2: a2 and HL low b2: a2), light requirements, nitrogen and phosphorus utilization, copper and virus sensitivity. Image File history File links Download high resolution version (3000x3002, 6358 KB) The Blue Marble: This photo is of Africa, Antarctica, and the Arabian Peninsula as taken en route to the Moon by Apollo 17s Harrison Schmitt on December 7, 1972. ... Image File history File links Download high resolution version (3000x3002, 6358 KB) The Blue Marble: This photo is of Africa, Antarctica, and the Arabian Peninsula as taken en route to the Moon by Apollo 17s Harrison Schmitt on December 7, 1972. ... Leaf. ... In biology and ecology, an organism (in Greek organon = instrument) is a complex adaptive system of organs that influence each other in such a way that they function as a more or less stable whole and have properties of life. ... In biology, a species is the basic unit of biodiversity. ... Earth is the third-closest planet to the Sun. ...


References

  • Steve Nadis, "The Cells That Rule the Seas: The ocean’s tiniest inhabitants, notes biological researcher Sallie W. Chisholm, hold the key to understanding the biosphere—and what happens when humans disrupt it", Scientific American. December 2003, pp 52f.

  Results from FactBites:
 
Prochlorococcus - Wikipedia, the free encyclopedia (309 words)
Prochlorococcus is a genus of marine cyanobacteria that now includes some three dozen species, differentiated on the basis of their ribosomal DNA.
Prochlorococcus is ubiquitous between 40°N and 40°S and dominates in the oligotrophic (nutrient poor) regions of the oceans.
Prochlorococcus occupies two distinct niches, leading to the nomenclature of the low light (LL) and high light (HL) groups, which vary in pigment ratios (LL possess a high ration of chlorophyll b2: a2 and HL low b2: a2), light requirements, nitrogen and phosphorus utilization, copper and virus sensitivity.
  More results at FactBites »

 
 

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