Contents
27 January 2017
Vol 355, Issue 6323
Vol 355, Issue 6323
Contents
This Week in Science
Editorial
Editors' Choice
Products & Materials
- New Products
A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.
In Brief
In Depth
- Metallic hydrogen created in diamond vise
Controversial claim may end 80-year quest for solid metal, but doubts remain.
- The Trump era: 10 questions
New president confronts a host of science-related issues.
- Brazil's ‘doomsday’ scenario
Grants in Rio go unpaid as science coffers are raided.
- Regulators drop controversial biospecimen consent proposal
Researchers had pushed against Common Rule provision.
- Big studies clash over fetal growth rates
New paper takes aim at global reference charts for unborn babies.
- Can dark matter vanquish controversial rival theory?
Challenge from modified Newtonian dynamics rebutted.
- Japanese military entices academics to break taboo
Critics assail expansion of dual-use research program.
Feature
- Out of bounds
How a dispute at Harvard led to a grad student's forced mental exam and an extraordinary restraining order against a prominent scientist.
- The polluted brain
The microscopic particles sifting from freeways and power plants don't just harm your heart and lungs. They may also attack your brain.
Working Life
Letters
Books et al.
- Back to the future
An epidemiologist takes a long view of our fraught relationship with the environment
- Darwin's American ascendancy
In a country on the brink of war, abolitionists found inspiration in On the Origin of Species
Policy Forum
- Challenges in researching terrorism from the field
Research must focus on how youth are engaged
Perspectives
- Cracking the problem of ice nucleation
Electron microscope data explain why feldspars are key to nucleating ice particles in clouds
- Seeing the forest through the trees
Remote-sensing data identify functional trait variation in tropical forests
- When degradation spurs segregation
A proteasome controls chromosome pairing and recombination during gamete formation
- Polynitrogen chemistry enters the ring
A cyclo-N5− anion has been synthesized as a stable salt and characterized
Association Affairs
Research Articles
- An N-end rule pathway that recognizes proline and destroys gluconeogenic enzymes
Gid4 is the Pro/N-recognin of a Pro/N-end rule pathway in yeast that targets N-terminal proline and adjacent motifs.
- Active sites in heterogeneous ice nucleation—the example of K-rich feldspars
Atmospheric ice nucleation on feldspar dust occurs at surface defects.
Reports
- Anomalously low electronic thermal conductivity in metallic vanadium dioxide
Charge and heat transport decouple in a strongly correlated electron system.
- Synthesis and characterization of the pentazolate anion cyclo-N5ˉ in (N5)6(H3O)3(NH4)4Cl
A ring of five nitrogen atoms has been stabilized and crystallographically characterized in a salt.
- Two- and three-body contacts in the unitary Bose gas
Interferometric measurements in a strongly interacting gas of 39K atoms quantify three-body correlations.
- Photosensitized, energy transfer-mediated organometallic catalysis through electronically excited nickel(II)
Photoexcited iridium can transfer energy to a nickel catalyst to access a C–O bond-forming pathway.
- Airborne laser-guided imaging spectroscopy to map forest trait diversity and guide conservation
Large-scale mapping of tropical forest trait diversity offers an approach for conservation.
- Gender stereotypes about intellectual ability emerge early and influence children’s interests
By age 6, girls become less likely to associate brilliance with their own gender and tend to avoid intellectually challenging activities.
- A chemical genetic roadmap to improved tomato flavor
Genomic analysis shows what genes to put back to reinstate flavor in tomatoes.
- IgG antibodies to dengue enhanced for FcγRIIIA binding determine disease severity
Immunoglobulin subclass IgG1, which lacks fucosyl residues, is implicated in severe dengue disease during secondary infections.
- Overlapping memory trace indispensable for linking, but not recalling, individual memories
In mice, repeated simultaneous reactivation of two initially separated memory traces links them together.
- A SUMO-ubiquitin relay recruits proteasomes to chromosome axes to regulate meiotic recombination
The cellular proteostasis machinery helps direct chromosome pairing and recombination during germ cell division.
- Control of meiotic pairing and recombination by chromosomally tethered 26S proteasome
The cellular proteostasis machinery helps direct chromosome pairing and recombination during germ cell division.
- Experimental measurement of binding energy, selectivity, and allostery using fluctuation theorems
A fluctuation theorem for ligand binding allows binding energies to be extracted from single-molecule pulling experiments.
- RPA binds histone H3-H4 and functions in DNA replication–coupled nucleosome assembly
The replication protein A complex plays a role in the assembly of new nucleosomes on newly replicated DNA strands.
Technical Comments
From the AAAS Office of Publishing and Member Services
About The Cover
COVER Solanum lycopersicum "sugary" tomatoes. Consumers love to hate the flavor of modern commercial tomatoes, especially compared with heirloom varieties. Chemical and genetic profiling of hundreds of modern and heirloom tomatoes shows why modern varieties are less flavorful and provides the information necessary for recovery of good flavor through breeding guided by molecular genetics. See page 391.
Photo: Fred Michel