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'''Secondary metabolites''' are [[organic compound]]s that are not directly involved in the normal [[cell growth|growth]], [[Biological development|development]], or [[reproduction]] of an organism.<ref name="Fraenkel">{{cite journal |author= Fraenkel, Gottfried S. |title= The raison d'Etre of secondary plant substances |journal= Science |volume=129 |issue= 3361|pages= 1466–1470|year=1959 |month=May |pmid= 13658975 |doi=10.1126/science.129.3361.1466}}</ref> Unlike [[primary metabolite]]s, absence of secondary metabolities does not result in immediate death, but rather in long-term impairment of the organism's [[survivability]], [[fecundity]], or aesthetics, or perhaps in no significant change at all. Secondary metabolites are often restricted to a narrow set of species within a [[phylogenetic]] group.<ref>
 
'''Secondary metabolites''' are [[organic compound]]s that are not directly involved in the normal [[cell growth|growth]], [[Biological development|development]], or [[reproduction]] of an organism.<ref name="Fraenkel">{{cite journal |author= Fraenkel, Gottfried S. |title= The raison d'Etre of secondary plant substances |journal= Science |volume=129 |issue= 3361|pages= 1466–1470|year=1959 |month=May |pmid= 13658975 |doi=10.1126/science.129.3361.1466}}</ref> Unlike [[primary metabolite]]s, absence of secondary metabolities does not result in immediate death, but rather in long-term impairment of the organism's [[survivability]], [[fecundity]], or aesthetics, or perhaps in no significant change at all. Secondary metabolites are often restricted to a narrow set of species within a [[phylogenetic]] group.<ref>
{{cite web | url = http://www.open2.net/sciencetechnologynature/worldaroundus/chemicalplants.html | title = Chemical plants | accessdate = 2008-12-19}}</ref> Secondary metabolites often play an important role in [[plant defense against herbivory]]<ref name="Stamp">{{cite journal |doi= 10.1086/367580 |author= Stamp, Nancy |title= Out of the quagmire of plant defense hypotheses |journal= The Quarterly Review of Biology |volume=78 |issue=1 |pages=23–55 |year=2003 |month=March |pmid= 12661508}}</ref> and other interspecies defenses. Humans use secondary metabolites as medicines, flavorings, and recreational drugs.
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{{cite web | url = http://www.open2.net/sciencetechnologynature/worldaroundus/chemicalplants.html | title = Chemical plants | accessdate = 2008-12-19}}</ref>. Humans use secondary metabolites as medicines, flavorings, and recreational drugs.
   
 
==Categories==
 
==Categories==

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Secondary metabolites are organic compounds that are not directly involved in the normal growth, development, or reproduction of an organism.[1] Unlike primary metabolites, absence of secondary metabolities does not result in immediate death, but rather in long-term impairment of the organism's survivability, fecundity, or aesthetics, or perhaps in no significant change at all. Secondary metabolites are often restricted to a narrow set of species within a phylogenetic group.[2]. Humans use secondary metabolites as medicines, flavorings, and recreational drugs.

CategoriesEdit

Most of the secondary metabolites of interest to humankind fit into categories which classify secondary metabolites based on their biosynthetic origin. Since secondary metabolites are often created by modified primary metabolite synthases, or "borrow" substrates of primary metabolite origin, these categories should not be interpreted as saying that all molecules in the category are secondary metabolites (for example the steroid category), but rather that there are secondary metabolites in these categories.

Small "small molecules"Edit

Big "small molecules", produced by large, modular, "molecular factories"Edit

Non-"small molecules" - DNA, RNA, ribosome, or polysaccharide "classical" biopolymersEdit

See alsoEdit

ReferencesEdit

  1. Fraenkel, Gottfried S. (May 1959). The raison d'Etre of secondary plant substances. Science 129 (3361): 1466–1470.
  2. Chemical plants. URL accessed on 2008-12-19.

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