Dimensional reduction at a quantum critical point

Article Abstract:

The Bose-Einstein condensate of spin triplets in the three-dimensional Mott insulator BaCu[Si.sub.2][O.sub.6] has provided an experimentally verifiable example of dimensional reduction at a quantum critical point (QCP). The results have shown that dimensionality acquires an emergent nature, although the individual particles move on a three-dimensional lattice, their collective behavior occurs in lower-dimensional space.

New Mexico, Barium Compounds, Analysis, Bose-Einstein condensation, Properties, Spin coupling

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Structure of the molybdopterin-bound Cnx1G domain links molybdenum and copper metabolism

Article Abstract:

Two high-resolution crystal structures of Cnx1G in complex with molybdopterin and with adenylated molybdopterin (molybdopterin-AMP), a mechanistically important intermediate is presented. The unexpected identification of copper bound to the molybdopterin dithiolate sulphurs in both structures, coupled with observed copper inhibition of Cnx1G activity, provides a molecular link between molybdenum and copper metabolism.

Molybdenum Compounds, Copper, Chemical properties

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Carbon nanotubes in an ancient Damascus sabre

Article Abstract:

High-resolution transmission electron microscopy is used to examine the Damascus sabre steel from the seventeenth century, which has indicated that the blade contains carbon nanotubes as well as cementite nanowires. This microstructure might provide insight into the banding pattern of the ultrahigh-carbon steel created from an ancient recipe that was lost long ago.

Germany, Hydrochloric Acid, Observations, Steel, Optical properties, Transmission electron microscopes, Mechanical properties, Nanotubes

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