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January 17, 2011 - Volume 89, Number 3
- p. 32
Science & Technology Concentrates
Nature
The chemical composition of these chiton teeth (dark blue structures on top and bottom of this optical micrograph) has been probed tomographically.
More Science & Technology Concentrates
- 3-D Nanoscale Chemical Maps Of Teeth
- Tomography analysis reveals compositional differences in microscopic tooth structures
- Interfacial Properties Boost Lasing by Quantum Dots
- Two-monolayer-thin alloy layer in core-shell nanocrystals aids optics applications
- Amoebas Found In Treated Drinking Water Worldwide
- Water Treatment: Free-living amoebas that evade common disinfection treatments can host Legionella and other hazardous microorganisms
- Natural Product Sidesteps Drug Resistance In Yeast
- Enzyme inhibitor could lead to new pharmaceuticals
- Red Blood Cell Mimics Circulate Longer When Flexible
- Cross-linking chemistry imparts bio-like property to hydrogel microparticles
- Arsenate-Phosphate Debate Continues
- Review suggests controversy should stimulate interest in studies of enzyme promiscuity
- Gaseous Carbonic Acid Trapped And Analyzed
- Elusive molecule shown to exist in monomeric and dimeric forms
- One-Pot Method Produces Pyrroles
- Reaction converts aromatic alkynes to heterocycles in presence of palladium catalyst
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)
Buried organic-inorganic interfaces in a biological specimen have been imaged with three-dimensional nanoscale resolution and chemical specificity (Nature, DOI: 10.1038/nature09686). The study, which was conducted by Northwestern University materials scientists Lyle M. Gordon and Derk Joester, reveals that individual 5- to 10-nm-wide organic fibers in the teeth of chitons, a type of marine mollusk that chews through rock, have distinct chemical compositions and distributions. These findings suggest distinct functions in otherwise similar tooth structures. The work also demonstrates that atom-probe tomography, a technique typically employed to analyze metallurgical and semiconductor samples, can be used to elucidate hidden structures and chemical features of biological importance. As chiton teeth mature, a relatively soft apatite or iron phosphate core capped by a hard magnetite layer gradually fills and occludes a fibrous organic scaffold. By preparing 3-D chemical maps of the usually hidden fibers and their surroundings, the team observed that sodium and magnesium ions cluster within the fibers in small domains. Furthermore, despite the fibers’ micrometer-scale proximity to one another, some of them exclusively bind only one type of ion, the team says.
- Chemical & Engineering News
- ISSN 0009-2347
- Copyright © 2011 American Chemical Society
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