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  • sterol
  • 5-alpha-Cholestane is the non-hydroxy, hydrogenated form of cholesterol and is useful as an internal standard for studies involving sterols.1 Cholesterol is a sterol that is essential for all animal life, being critical for membrane permeability and fluidity and for many cellular functions. (universalbiologicals.com)
  • Organic
  • 24-isopropyl cholestane is an organic molecule produced by specific sponges and marine algae. (wikipedia.org)
  • However, there are several arguments against causally linking 24-isopropyl cholestane to sponges based on considerations of marine algae and the potential alteration of organic molecules over geologic time. (wikipedia.org)
  • The Westphalen-Lettré rearrangement is a classic organic reaction in organic chemistry describing a rearrangement reaction of cholestane-3β,5α,6β-triol diacetate with acetic anhydride and sulfuric acid. (wikipedia.org)
  • High
  • High abundance of cholestane relative to the others has been interpreted as the presence of rhodophytes. (wikipedia.org)
  • High abundances of 24-isopropyl cholestane are identified in the Precambrian rocks from the Hufq supergroup in Oman, suggesting the presence of sponges prior to the Cambrian explosion. (wikipedia.org)