18S Ribosomal DNA
18S may refer to: *18S ribosomal RNA * 18S rRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase * 18SEH See also *S18 (other) S18 may refer to: Aviation * Forks Airport, in Clallam County, Washington, United States * Letov Š-18, a Czechoslovak biplane trainer * Rans S-18 Stinger II, an American ultralight * Saab 18, a Swedish bomber and reconnaissance aircraft * Sikor ...

18S Ribosomal RNA
18S ribosomal RNA (abbreviated 18S rRNA) is a part of the ribosomal RNA. The S in 18S represents Svedberg units. 18S rRNA is an SSU rRNA, a component of the eukaryotic ribosomal small subunit (40S). 18S rRNA is the structural RNA for the small component of eukaryotic cytoplasmic ribosomes, and thus one of the basic components of all eukaryotic cells. 18S rRNA is the eukaryotic cytosolic homologue of 16S ribosomal RNA in prokaryotes and plastids. 18S rRNA is also a homologue of 12S ribosomal RNA in mitochondria. The genes coding for 18S rRNA are referred to as 18S rRNA genes. Sequence data from these genes is widely used in molecular analysis to reconstruct the evolutionary history of organisms, especially in vertebrates, as its slow evolutionary rate makes it suitable to reconstruct ancient divergences. Uses in phylogeny The small subunit (SSU) 18S rRNA gene is one of the most frequently used genes in phylogenetic studies and an important marker for random target polymerase ...
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18S RRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase
18S rRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase (, ''18S rRNA dimethylase Dim1p'', ''Dim1p'', ''ScDim1'', ''m2(6)A dimethylase'', ''KIDIM1'') is an enzyme with systematic name ''S-adenosyl-L-methionine:18S rRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase''. This enzyme catalyses the following chemical reaction : 4 S-adenosyl-L-methionine + adenine1779/ adenine1780 in 18S rRNA 18S may refer to: *18S ribosomal RNA *18S rRNA (adenine1779-N6/adenine1780-N6)-dimethyltransferase *18SEH The Family II is a straight-4 piston engine that was originally developed by Opel in the 1970s, debuting in 1979. Available in a wide ran ... \rightleftharpoons 4 S-adenosyl-L-homocysteine + N6-dimethyladenine1779/N6-dimethyladenine1780 in 18S rRNA DIM1 is involved in pre-rRNA processing. References External links * {{Portal bar, Biology, border=no EC 2.1.1 ...
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18SEH
The Family II is a straight-4 piston engine that was originally developed by Opel in the 1970s, debuting in 1979. Available in a wide range of cubic capacities ranging from 1598 to 2405 cc, it simultaneously replaced the Opel OHV, Opel CIH and Vauxhall Slant-4 engines, and was GM Europe's core powerplant design for much of the 1980s. The engine features a cast iron block, an aluminium head, and a timing belt driven valvetrain. The timing belt also drives the water pump. It was first used in the Opel Kadett D, Ascona B, Corsa, and their corresponding Vauxhall sister models, the Astra, Cavalier, and Nova. Many General Motors subsidiaries, including Daewoo, GM do Brasil, GM Powertrain, and Holden have used this design. By 1986, the Family II unit had completely supplanted the CIH engine as Opel's core 4-cylinder powerplant. although the 6-cylinder versions of the CIH continued in the larger Omega and Senator models until 1995. In 2004, a 2.0 L ''MultiPower'' engine ...
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