Vol 304, Issue 5677
SoilsThe Final Frontier
Introduction to special issue
This Week in Science
Products & Materials
News of the Week
Archameides' spirals in ancient Chinese jade rings may have been carved with a simple machine three centuries or more before such machines were invented in the West.
When large particles of a palladium catalyst are replaced with nanoparticles, fluctuations in the number of CO molecules interacting with the catalyst drive oxidation reaction without hysteresis.
Opi1p, a transcription factor that represses phospholipid biosynthesis in yeast, is reversibly sequestered on the endoplasmic reticulum depending on the level of phosphatidic acid in the membrane.
A superconducting loop that amplifies the signal from a small magnetic resistor allows detection of minute magnetic fields at much higher temperatures than previously thought possible.
The enzyme chloroperoxidase has an FeIV-OH species that makes it more basic, reducing its redox potential to levels that preserve its polypeptide chains while still allowing it to be a powerful oxidizer.
An ocean drill core east of New Zealand shows that glaciers there varied in step with Antarctic climate during the past 370,000 years of a 3.9-million-year record.
A 130-million-year isotopic record of seawater sulfate reveals several excursions in Earth's atmospheric oxygen content and also indicates that volcanism and hydrothermal activity decreased about 50 million years ago.
As limbs develop, the transcription factor HOX participates at two different stages: first to specify the asymmetrical formation of digits, then to help form different finger types.
The calcium pump moves ions across cell membranes by phosphorylation-induced occlusion of one end of the pore to prevent ions from slipping backward; relaxing this high-energy state releases the ions on the other side.
Linker histones, proteins known to suppress gene activity by condensing chromatin, also activate genes involved in muscle development by binding to other regulatory proteins.
A human enzyme that can degrade the chitin of insect exoskeletons also regulates allergic inflammation in asthma, reinforcing the similarities between immune responses to parasitic and allergic stimuli.
A smart dog can learn new words rapidly and hold them in memory for up to 4 weeks, perhaps employing a basic learning mechanism that humans also use.