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Latest Ester Stories

2008-05-16 06:00:00

By Lawrie, Kirsten J Meredith, Paul; McGeary, Ross P ABSTRACT The isolation, structure determination and chemical characterization of eumelanins has been plagued by their very low solubility in organic solvents. To gain insights into the structure and reactivity of these unusual and important biologic macromolecules and to pave the way for their use in electronics, we have prepared soluble melanins via the synthesis of monomeric precursors containing lipophilic substituents. Two such...

2007-09-19 09:01:49

By Adebayo, Muritala A Karioti, Anastasia; Skaltsa, Helen; Ogunwande, Isiaka A Key Word Index Securidaca longepedunculata, Polygalaceae, essential oil composition, methyl salicylate. Introduction Nigeria is blessed with a diversity of flora, most of which has remained unexploited for their chemical constituents and biological potentials. Securidaca longepedunculata Fers. (Polygalaceae) is commonly used as a medicine in many parts of Africa. In Nigeria, the plant is commonly employed for...

2007-06-07 06:00:30

By Jirovetz, Leopold; Buchbauer, Gerhard; Schmidt, Erich; Stoyanova, Albena S; Et al Abstract Commercially available geraniol and nerol, as well as some derivatives, were analyzed for their purity using GC and GC/MS. The olfactoric quality of the samples was evaluated by professional perfumers. Antimicrobial testings using an agar dilution and an agar diffusion method were done to obtain information about their activities against some Gram-(+) and Gram-(-) bacteria, as well as the yeast...

2007-02-14 09:01:01

By Gupta, Neal S; Briggs, Derek E G; Pancost, Richard D Graptolites are important fossils in Early Palaeozoic assemblages. Preserved graptolite periderm consists dominantly of an aliphatic polymer, immune to base hydrolysis. It contains no protein even though its structure, and chemical analyses of the periderm of the living relative Rhabdopleura, indicate that it was originally collagen. This anomaly was previously interpreted as the result of replacement by macromolecular material from...


Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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