Studies on radiation pasteurisation of medium fatty fish 3. Storage properties of white pomfret (Stromateus cinereus) fillets

White pomfret fillets packed under aerobic conditions had a limited shelf life of 8 days as against 10 days for samples packed under vacuum and stored at 0-2°C. Irradiation and subsequent storage of the fillets under vacuum at 0-2°C exhibited shelf lives of 30, 50 and 60 days for radiation doses of 0.1, 0.3 and 0.5 Mrad respectively in contrast to aerobically packed fillets which showed only 20, 35 and 50 days of storage life for the same levels of radiation doses and developed yellow discolouration and rancid odours

Atomistic Studies of Defect Nucleation during Nanoindentation of Au (001)

Atomistic studies are carried out to investigate the formation and evolution of defects during nanoindentation of a gold crystal. The results in this theoretical study complement the experimental investigations [J. D. Kiely and J. E. Houston, Phys. Rev. B, v57, 12588 (1998)] extremely well. The defects are produced by a three step mechanism involving nucleation, glide and reaction of Shockley partials on the {111} slip planes noncoplanar with the indented surface. We have observed that slip is in the directions along which the resolved shear stress has reached the critical value of approximately 2 GPa. The first yield occurs when the shear stresses reach this critical value on all the {111} planes involved in the formation of the defect. The phenomenon of strain hardening is observed due to the sessile stair-rods produced by the zipping of the partials. The dislocation locks produced during the second yield give rise to permanent deformation after retraction.Comment: 11 pages, 13 figures, submitted to Physical Review

Copper-mediated synthesis of coumestans via C(sp2)-H functionalization: Protective group free route to coumestrol and 4′-O-methylcoumestrol

A simple and efficient two step synthesis of coumestans is described. The key reaction in the synthesis is the use of easily available Cu(OAc)2 for C[sbnd]H functionalization of 3-(2-hydroxyphenyl)coumarin to give coumestan ring system via formal oxidative cyclization. This approach provided a short protective group free route to naturally occurring coumestrol and 4′-O-methylcoumestrol. © 2017 Elsevier Lt

Copper-mediated synthesis of coumestans via C(sp2)-H functionalization: Protective group free route to coumestrol and 4′-O-methylcoumestrol

A simple and efficient two step synthesis of coumestans is described. The key reaction in the synthesis is the use of easily available Cu(OAc)2 for C[sbnd]H functionalization of 3-(2-hydroxyphenyl)coumarin to give coumestan ring system via formal oxidative cyclization. This approach provided a short protective group free route to naturally occurring coumestrol and 4′-O-methylcoumestrol. © 2017 Elsevier Lt

Domino Wittig-Diels Alder reaction: Synthesis of carbazole lignans

A convenient two step protocol for the synthesis of carbazole lignans involving Domino Wittig reaction/Diels Alder reaction followed by aromatization with DDQ is described. The main step of this protocol involves interaction between 2- or 3-indolecarboxyaldehydes and cinnamyl 2-(triphenylphosphoranylidene)acetates. ©2016 Elsevier Ltd. All rights reserved

Domino Wittig-Diels Alder reaction: Synthesis of carbazole lignans

A convenient two step protocol for the synthesis of carbazole lignans involving Domino Wittig reaction/Diels Alder reaction followed by aromatization with DDQ is described. The main step of this protocol involves interaction between 2- or 3-indolecarboxyaldehydes and cinnamyl 2-(triphenylphosphoranylidene)acetates. ©2016 Elsevier Ltd. All rights reserved