Contents
Vol 313, Issue 5783
Contents
This Week in Science
Editorial
Editors' Choice
NetWatch
Departments
Products & Materials
News of the Week
ScienceScope
Random Samples
Newsmakers
News Focus
Letters
Books
Policy Forum
Perspectives
Review
Brevia
- Nuclear Gene Indicates Coat-Color Polymorphism in Mammoths
The sequence of the melanocortin receptor gene from mammoth DNA indicates the presence of two alleles, which may have specified light or dark hair coloration.
Research Articles
- Hox Control of Organ Size by Regulation of Morphogen Production and Mobility
The small size of the Drosophila hindwing results from spatial restriction of the critical morphogen by binding proteins not expressed in the larger forewing.
- Hierarchical Action and Inhibition of Plant Dicer-Like Proteins in Antiviral Defense
RNA silencing blocks infection and long-distance transport of infecting viruses in Arabidopsis.
Reports
- The Geometry of Musical Chords
Chords can be mapped as points onto a many-fold surface, on which consonant chords cluster together, connected by melodic lines that reveal western harmony and counterpoint.
- A High-Brightness Source of Narrowband, Identical-Photon Pairs
A laser-cooled cloud of cesium atoms trapped in a cavity provides a large number of near-identical photon pairs needed for quantum-computing applications.
- Surface Crystallization in a Liquid AuSi Alloy
The surface of a particular gold-silicon mixture heated above its melting point becomes crystalline even though the alloy forms only glassy solid phases at lower temperatures.
- Probing the Solvent-Assisted Nucleation Pathway in Chemical Self-Assembly
Spectroscopy reveals that even-numbered carbon chains in a solvent help direct the self-assembly of phenylenevinylene oligomers into helical stacks.
- Photoproduction of Proton Gradients with π-Stacked Fluorophore Scaffolds in Lipid Bilayers
Visible light creates a transmembrane pH gradient and a pore by producing chares on opposite ends of fluorophores that span the membranes of lipid vesicles.
- Hydrogen Isotopes in Eocene River Gravels and Paleoelevation of the Sierra Nevada
Hydrogen isotope data from clay minerals in ancient stream cobbles imply that the Sierra Nevada in California have been high mountains since about 50 million years ago.
- Antibiotic Stress Induces Genetic Transformability in the Human Pathogen Streptococcus pneumoniae
In addition to selecting for resistance, antibiotic treatment of Streptococcus bacteria stimulates exchange of genetic material among individuals, further enhancing resistance and virulence.
- Presymptomatic Detection of Prions in Blood
Infectious prions can be detected in the blood of infected hamsters before they exhibit any signs of illness.
- Prion-Induced Amyloid Heart Disease with High Blood Infectivity in Transgenic Mice
Transgenic mice with a soluble form of the prion protein develop heart disease and high blood levels after infection with the scrapie prion.
- The Importance of Demographic Niches to Tree Diversity
Data from a vast long-term survey of tropical forests contradict the prevailing view that tree species richness results from variability in rates of recruitment and mortality.
- A Single Amino Acid Mutation Contributes to Adaptive Beach Mouse Color Pattern
An allele of the melanocortin receptor found in mice adapted for living on beach sand is responsible for their light fur.
- Decay of Endoplasmic Reticulum-Localized mRNAs During the Unfolded Protein Response
When stressed, cells selectively degrade those messenger RNAs that encode secretory proteins, preventing overloading of the endoplasmic reticulum.
- Polo-Like Kinase Cdc5 Controls the Local Activation of Rho1 to Promote Cytokinesis
In yeast, regulatory enzymes work together to activate actin in the contractile ring, causing it to constrict and separate daughter cells during cell division.
Technical Comments
