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[×ÊÔ´] ¡¶Science¡·(»¯Ñ§¡¢²ÄÁÏ)Á¬ÔØ----(12 September 2008)

CHEMISTRY: Bringing Stability to Highly Reduced Iron-Sulfur Clusters
Eckard M¨¹nck and Emile L. Bominaar
Science 12 September 2008: 1452-1453.
Summary: A synthetic mimic of the most reduced iron-sulfur cluster in electron-transfer proteins shows a remarkable resemblance to protein-bound clusters.

Imaging of Transient Structures Using Nanosecond in Situ TEM
Judy S. Kim, Thomas LaGrange, Bryan W. Reed, Mitra L. Taheri, Michael R. Armstrong, Wayne E. King, Nigel D. Browning, and Geoffrey H. Campbell
Science 12 September 2008: 1472-1475.
Rapidly pulsing electrons through a transmission electron microscope allows imaging of localized cooling and phase separation along a propagating reaction front in a laminate.

Degradation of microRNAs by a Family of Exoribonucleases in Arabidopsis
Vanitharani Ramachandran and Xuemei Chen
Science 12 September 2008: 1490-1492.
A class of nucleases specific for short single-stranded RNAs is found to degrade microRNAs in Arabidopsis; their mutation results in numerous developmental defects.

Activation of Aldehyde Dehydrogenase-2 Reduces Ischemic Damage to the Heart
Che-Hong Chen, Grant R. Budas, Eric N. Churchill, Marie-H¨¦l¨¨ne Disatnik, Thomas D. Hurley, and Daria Mochly-Rosen
Science 12 September 2008: 1493-1495.
A compound that activates the mitochondrial enzyme aldehyde dehydrogenase-2 reduces the extent of heart damage in a rodent model of heart attack.

Conformational Switch of Syntaxin-1 Controls Synaptic Vesicle Fusion
Stefan H. Gerber, Jong-Cheol Rah, Sang-Won Min, Xinran Liu, Heidi de Wit, Irina Dulubova, Alexander C. Meyer, Josep Rizo, Marife Arancillo, Robert E. Hammer, Matthijs Verhage, Christian Rosenmund, and Thomas C. S¨¹dhof
Science 12 September 2008: 1507-1510.
Published online 14 August 2008 [DOI: 10.1126/science.1163174] (in Science Express Reports)
The synaptic vesicle protein that mediates membrane fusion during exocytosis also regulates the rate and extent of this process by controlling vesicle tethering.

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Science (19 September 2008)

CHEMISTRY: Fluorous Tags Unstick Messy Chemical Biology Problems
Dennis P. Curran
Science 19 September 2008: 1645-1646.
Summary: Separation and identification of biological molecules from complex mixtures can be made easier with fluorinated labeling groups and separation media

Transient Electronic Structure and Melting of a Charge Density Wave in TbTe3
F. Schmitt, P. S. Kirchmann, U. Bovensiepen, R. G. Moore, L. Rettig, M. Krenz, J.-H. Chu, N. Ru, L. Perfetti, D. H. Lu, M. Wolf, I. R. Fisher, and Z.-X. Shen
Science 19 September 2008: 1649-1652.
Published online 14 August 2008 [DOI: 10.1126/science.1160778] (in Science Express Reports)
Photoemission spectroscopy is extended to reveal the dynamics of correlated electronic phase transitions, showing how ordered electrons "melt" upon heating of TbTe3.

Coupled Superconducting and Magnetic Order in CeCoIn5
M. Kenzelmann, Th. Strässle, C. Niedermayer, M. Sigrist, B. Padmanabhan, M. Zolliker, A. D. Bianchi, R. Movshovich, E. D. Bauer, J. L. Sarrao, and J. D. Thompson
Science 19 September 2008: 1652-1654.
Published online 21 August 2008 [DOI: 10.1126/science.1161818] (in Science Express Reports)
Unlike other superconductors, magnetic ordering coexists with and is stabilized by superconductivity in the exotic superconductor CeCoIn.

Shape Changes of Supported Rh Nanoparticles During Oxidation and Reduction Cycles
P. Nolte, A. Stierle, N. Y. Jin-Phillipp, N. Kasper, T. U. Schulli, and H. Dosch
Science 19 September 2008: 1654-1658.
Pyramidal rhodium nanoparticles flatten upon surface oxidation at high temperatures but revert upon reduction, allowing the study of how structure affects catalytic activity.

Polymer Pen Lithography
Fengwei Huo, Zijian Zheng, Gengfeng Zheng, Louise R. Giam, Hua Zhang, and Chad A. Mirkin
Science 19 September 2008: 1658-1660.
Published online 14 August 2008 [DOI: 10.1126/science.1162193] (in Science Express Reports)
An array that can support millions of thin, flexible polymer pens can be used to deposit tiny molecular ink dots of variable size over large areas.

4D Electron Diffraction Reveals Correlated Unidirectional Behavior in Zinc Oxide Nanowires
Ding-Shyue Yang, Changshi Lao, and Ahmed H. Zewail
Science 19 September 2008: 1660-1664.
Ultrafast electron diffraction reveals that exciting the electrons of a zinc oxide nanowire causes a sudden extension, more than a hundred times longer than expected from heating.

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2Â¥2008-09-20 13:17:48
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