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May 30, 2011 - Volume 89, Number 22
- p. 45
Science & Technology Concentrates
More Science & Technology Concentrates
- Sniffing Out Black- Currant Structures
- Microwave spectroscopy and quantum chemistry provide gas-phase information on fragrant molecules.
- Organic Layer Smooths Dielectric Films
- Insulating layer in nanoelectronic devices benefits from an organic undercoat.
- Microbe’s Protein Structure Elucidated
- Study finds that arrangement of heme groups forms electron shuttle.
- Pulling Out Protein Complexes
- Antibody-based method isolates proteins from complexes for single-molecule analysis.
- Molecular Constraint Inhibits Peptide Aggregation
- Reversible modification enhances water solubility and simplifies synthesis.
- Peptide-Nanotube Assemblies Create Superstructures
- Specially designed biomolecules coil around nanotubes and guide supramolecular ordering.
- Key Catalyst Support Parameters Identified
- Maximum surface area coupled with 3D interconnectivity enhances catalytic activity and selectivity.
- Scorpion Venom Unfriendly To Fungi
- Peptides and other compounds from stinging critter exhibit fungicidal properties.
Topics Covered
More Science Stories
October 24, 2011
Bryostatins Retain Promise
(October 24, 2011 | Vol. 89 Issue 43 | pp. 10-17)New results in total synthesis reinvigorate a 40-year-old field of research.
For Cave's Art, An Uncertain Future
(October 24, 2011 | Vol. 89 Issue 43 | pp. 38-40)Disagreement on conservation course of action complicates a potential reopening.
Cancer Stem Cells
(October 24, 2011 | Vol. 89 Issue 43 | pp. 41-43)Researchers zero in on the pathways that allow cancer to bounce back after treatment.
What's That Stuff? Blue Jeans
(October 24, 2011 | Vol. 89 Issue 43 | p. 44)Making the iconic pants requires both color-addition and color-removal chemistry.
Shedding Nanoparticles
(October 24, 2011 | Vol. 89 Issue 43 | p. 5)Materials Science: Chemists observe metal objects sloughing off ions to form nanoparticles.
Modifying Messenger RNA
(October 24, 2011 | Vol. 89 Issue 43 | p. 7)Chemical Biology: Methylated bases in mRNA may have roles in gene regulation and obesity.
Lab-On-A-Chip For Planets, Moons
(October 24, 2011 | Vol. 89 Issue 43 | p. 8)Microfluidics: Automated chip is designed to detect extraterrestrial amino acids.
New Editor For Analytical Chemistry
(October 24, 2011 | Vol. 89 Issue 43 | p. 9)Publishing: Jonathan Sweedler to take the helm.
Science & Technology Concentrates
(October 24, 2011 | Vol. 89 Issue 43 | p. 37)
October 17, 2011
Improving Shop Safety
(October 17, 2011 | Vol. 89 Issue 42 | pp. 56-57)Yale updates policies on machine shop use after student death.
Cleaning Acrylics
(October 17, 2011 | Vol. 89 Issue 42 | pp. 58-59)Conservation scientists seek new ways to keep modern paintings looking their best.
Detecting H2S In Vivo (Member Content)
(October 17, 2011 | Vol. 89 Issue 42 | p. 60)Studies could lead to sensitive and selective analyses for tiny signaling agent.
Rules For Design
(October 17, 2011 | Vol. 89 Issue 42 | p. 9)Materials Science: Guidelines predict structures formed by nanoparticles and DNA linkers.
Identifying Modified Cells
(October 17, 2011 | Vol. 89 Issue 42 | p. 11)Molecular Biology: Technique tags and enriches cells genetically altered by nucleases.
Linker-Free Molecular Wires
(October 17, 2011 | Vol. 89 Issue 42 | p. 12)Electronics: Metal-carbon bonds increase electrical conductance.
Asymmetry From A Guest
(October 17, 2011 | Vol. 89 Issue 42 | p. 13)Stereochemistry: Enzymelike pocket that hosts chiral species controls catalyst's enantioselectivity.
Science & Technology Concentrates
(October 17, 2011 | Vol. 89 Issue 42 | pp. 54-56)
Science
View Enlarged Image
A model structure shows glycine-rich peptides wrapping around a carbon nanotube; blue-to-red coloring on the peptide helices indicates N-to-C terminal direction.
Coating carbon nanotubes with peptides can produce structurally specific, tunable macromolecular assemblies, University of Pennsylvania researchers report (Science, DOI: 10.1126/science.1198841). Led by biochemistry professor William F. DeGrado, the group used computational design methods to develop glycine- and alanine-rich helical peptides that wrap into a supercoiled layer around single-walled carbon nanotubes. Glycine or alanine groups are needed on one side of a peptide helix to interface with the nanotube, while residues at helical interfaces direct assembly. Other amino acids in the peptides can be altered to modulate the solubility or stability of the constructs, or functionalize the surface. In one case, DeGrado and colleagues nucleated gold nanoclu sters on the surface of a peptide-coated nanotube, creating an additional ordered layer of nanoparticles on top of the peptide layer. The peptides can also be tuned to bind to specific nanotube geometries. The overall approach provides a way to create defined and controllable structures on an otherwise featureless surface, the authors say.
- Chemical & Engineering News
- ISSN 0009-2347
- Copyright © 2011 American Chemical Society
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