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American microbiologist Carl Woese established this grouping in 1987, calling it informally the "purple bacteria and their relatives". [12] The group was later formally named the 'Proteobacteria' after the Greek god Proteus, who was known to assume many forms. [13]
The following is a breakdown of the energetics of the photosynthesis process from Photosynthesis by Hall and Rao: [6]. Starting with the solar spectrum falling on a leaf, 47% lost due to photons outside the 400–700 nm active range (chlorophyll uses photons between 400 and 700 nm, extracting the energy of one 700 nm photon from each one)
Photosynthesis (from the Greek phos = light and synthesis = combination) is a biochemical process by which the energy of light is converted into chemical energy in plants, algae, and certain bacteria For more information, see Photosynthesis .
Two families of reaction centers in photosystems can be distinguished: type I reaction centers (such as photosystem I in chloroplasts and in green-sulfur bacteria) and type II reaction centers (such as photosystem II in chloroplasts and in non-sulfur purple bacteria). The two photosystems originated from a common ancestor, but have since ...
Photosynthesis is a process where light is absorbed or harvested by pigment protein complexes which are able to turn sunlight into energy. [5] Absorption of a photon by a molecule takes place when pigment protein complexes harvest sunlight leading to electronic excitation delivered to the reaction centre where the process of charge separation can take place.
stems as the main site of photosynthesis, rather than leaves; compact, reduced, cushion-like, columnar, or spherical growth form; ribs enabling rapid increases in plant volume and decreasing surface area exposed to the sun
The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis or Oxygen Holocaust, [2] was a time interval during the Earth's Paleoproterozoic era when the Earth's atmosphere and shallow seas first experienced a rise in the concentration of free oxygen. [3]
Bacteriorhodopsin is a light-driven H + ion transporter found in some haloarchaea, most notably Halobacterium salinarum (formerly known as syn. H. halobium).The proton-motive force generated by the protein is used by ATP synthase to generate adenosine triphosphate (ATP).