The preparations of the racemic [Cr(ox)(AA)2]ClO4 salts (AA = en, RS-pn and tn) are described. These have been resolved by the method of racemic modifications using the monohydrogen dibenzoyl-(+)-tartrate anion and the less soluble diastereoisomerides have been assigned to Nike Air Max 90 Pas Cher
the Δ absolute configuration on the basis of the measured circular dichroism spectra.
A primitive variable, least-squares finite element formulation for inviscid, compressible flow is proposed. A unique feature of the formulation is the representation of groups of variables rather than single variables. Numerical solutions are presented for two-dimensional, subcritical flow about circular and elliptic cylinders and two representative airfoils.
A new electron cryomicroscopic reconstruction of an actin–scruin bundle from Limulus sperm reveals details about the enormous structural plasticity within F-actin. The twist and tilt of the actin subunits show very large deviations from ideal F-actin, providing clues about actin dynamics.
Corrosion behaviour of different P/M stainless steels have been studied through immersion and potenciodinamic tests. The studied materials were two austenitic and ferritic grades, and different duplex steels obtained both from prealloyed powders, Air Max 87 Leopard
and through mixing ferritic and austenitic powders at different percentages.