alkenones

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alkenones [′al·kə‚nōnz]

(geology)

Long-chain (37-39 carbon atoms) di-, tri-, and tetraunsaturated methyl and ethyl ketones produced by certain phytoplankton (coccolithophorids), which biosynthetically control the degree of unsaturation (number of carbon-carbon double bonds) in response to the water temperature; the survival of this temperature signal in marine sediment sequences provides a temporal record of sea surface temperatures that reflect past climates.

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No references found			Many papers discus the controlling mechanisms that may have forced major climate change, such as geographical and oceanographic changes during the Late Ordovician or changing ocean gateways in the Cenozoic, while others discuss biological and chemical proxies that can be used to track ancient climate change, such as the use of Ca/Mg ratio of foraminifer tests or alkenones from surface- dwelling marine-algae. Deep-time perspectives on climate change; marrying the signal from ... by SciTech Book News			alkaline soil Alkaline Storage Battery alkaline tide alkaline wash Alkaline-Earth Metal alkaline-earth metals alkaline-earth oxide alkaline-manganese cell alkalinity alkaliphile alkaloid Alkaloids alkalometry alkalosis Alkama Ibn Abada alkamine Alkan, Charles Henri Valentin alkane Alkanes Alkanet alkannin alkanolamine alkaptonuria Alkar process alkene alkenones Alkhanchurt Valley Alkhimov, Vladimir Alkhimov, Vladimir Sergeevich Alkino Alkio, Santeri Alkmaar Alkonost alkoxide alkoxy Alksnis, Adams Eduards Alksnis, Iakov Alksnis, Iakov Ivanovich alkyd paint alkyd resin Alkyd Resins alkyl alkyl group alkyl halide alkylamine alkylaryl sulfonates alkylate alkylate bottom alkylated gasoline alkylation alkylbenzene sulfonates			alkaptonuria Alkaptonuric ochronosis Alkaptonuric ochronosis Alkaptonuric ochronosis Alkar process Alkargen Alkarsin Alkarsin Alkaseltzer Alkaseltzer Alkatraz Alkatraz Island alkavervir Alkazar AlkB ALKC Alkek Velodrome Park Advisory Council Alkekengi Alken Alken Alken alkene alkene alkene Alkenes Alkenes Alkenes Alkenol Alkenol Alkenol alkenones Alkenyl Alkenyl Alkenyl Alkeran Alkeran Alkermes Alkermes mineral Alkermes, Inc. Alkhanchurt Valley Alkhimov, Vladimir Alkhimov, Vladimir Sergeevich Alkhurma hemorrhagic fever virus Alki Point ALKIADT Alkibiades Alkibiades alkide alkie alkies alkine alkine alkine Alkino Alkinoos Alkinoös Alkínoös Alkio, Santeri

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