Experimental constraints on fluid-rock reactions during incipient serpentinization of harzburgite
Klein, Frieder
2014-10-20
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The bioactivity directed analysis of the extract from a sponge of the genus Sarcotragus led to the isolation of a series of bioactive sesterterpenes, of which variabilin (1a) was the major component. The sesterterpenes (29a), (30) and (31a), along with the related C₂₁ furanoterpene (32), were present in lesser amounts. The unequivocal assignment of the stereochemistry of the 20,21 double bond in variabilin as 20(Z) was achieved through examination of the22-O-methyl derivative (1b) of variabilin and the isolation of the variabilin isomer (29a) with the 20(E) stereochemistry.
Variabilin was also isolated from a sponge of the genus lrcinia. The four related bioactive sesterterpenes (33b), (34b), (35b), and (36b) together with (31b) were isolated from a methylated extract from the same sponge.
Variabilin autooxidised in the presence of...
Boron nitride nanotubes were functionalized by microperoxidase-11 in aqueous media, showing improved catalytic performance due to a strong electron coupling 10 between the active centre of microperoxidase-11 and boron nitride nanotubes. One main application challenge of enzymes as biocatalysts is molecular aggregation in the aqueous solution. This issue is addressed by immobilization of enzymes on solid supports which 15 can enhance enzyme stability and facilitate separation, and recovery for reuse while maintaining catalytic activity and selectivity. The protein-nanoparticle interactions play a key role in bio-nanotechnology and emerge with the development of nanoparticle-protein “corona”. Bio-molecular coronas provide a 20 unique biological identity of nanosized materials.1, 2 As a structural analogue to carbon nanotubes (CNTs), Boro...
