Experiments that reveal the behaviour of antihydrogen could tell physicists more about the rules that hold the Universe together.
If the Trump administration has questions on global warming, it should direct them to the national academy rather than setting up a spurious ‘red team–blue team’ debate.
Gene-editing experiment pushes scientific and ethical boundaries.
The country wants to use a focus on research to solve its problems and build diplomatic ties in the Middle East.
Officials at the US Environmental Protection Agency are consulting global-warming sceptics as they weigh up a technical review.
One of scientists’ favourite statistics — the P value — should face tougher standards, say leading researchers.
Islands in the region could be rid of the biting insects within a decade.
In the shadow of the Large Hadron Collider, six teams are competing to answer one of the Universe’s deepest existential questions.
News & Views
A state of matter called a quark–gluon plasma is produced in energetic collisions of heavy ions. The rotation of this plasma has been measured for the first time, providing insights into the physics of the strong nuclear force. See Letter p.62
The use of state-of-the-art techniques to study neuronal activity during a navigational task involving sound stimuli broadens our understanding of how neuronal populations produce complex behaviours. See Letter p.92
The molecule fructose-1,6-bisphosphate, which is produced during glucose metabolism, has been shown to mediate cellular sensing of glucose deprivation through an unexpected mechanism. See Letter p.112
The nature of exoplanetary atmospheres is hotly debated. The thermal spectrum of an exoplanet called a hot Jupiter reveals the presence of an analogue of Earth's ozone layer, although its composition is unknown. See Letter p.58
Progress is being made in the use of personalized approaches to create both in vitro and in vivo tumour models that could be used to aid cancer drug-treatment decisions and increase our understanding of how tumours respond to therapy.
Within the human microbiome there is tension between microbes evolving to compete within the host ecosystem, and hosts trying to keep them under control.
Ablation of hypothalamic stem/progenitor cells in mice leads to ageing-related decreases in physiological parameters and lifespan, and the speed of ageing is partially controlled by these cells through the release of exosomal miRNAs.
Observations of the gas-giant exoplanet WASP-121b reveal near-infrared emission lines of water, suggesting that the planet has a stratosphere—a layer in the upper atmosphere where temperature increases with altitude.
The extreme energy densities generated by ultra-relativistic collisions between heavy atomic nuclei produce a state of matter that behaves surprisingly like a fluid, with exceptionally high temperature and low viscosity. Non-central collisions have angular momenta of the order of 1,000ћ, and the resulting fluid may have a strong vortical structure that must be understood to describe the fluid properly. The vortical structure is also of particular interest because the restoration of fundamental symmetries of quantum chromodynamics is expected to produce novel physical effects in the presence of strong vorticity. However, no experimental indications of fluid vorticity in heavy ion collisions have yet been found. Since vorticity represents a local rotational structure of the fluid, spin–orbit coupling can lead to preferential orientation of particle spins along the direction of rotation. Here we present measurements of an alignment between the global angular momentum of a non-central collision and the spin of emitted particles (in this case the collision occurs between gold nuclei and produces Λ baryons), revealing that the fluid produced in heavy ion collisions is the most vortical system so far observed. (At high energies, this fluid is a quark–gluon plasma.) We find that Λ and hyperons show a positive polarization of the order of a few per cent, consistent with some hydrodynamic predictions. (A hyperon is a particle composed of three quarks, at least one of which is a strange quark; the remainder are up and down quarks, found in protons and neutrons.) A previous measurement that reported a null result, that is, zero polarization, at higher collision energies is seen to be consistent with the trend of our observations, though with larger statistical uncertainties. These data provide experimental access to the vortical structure of the nearly ideal liquid created in a heavy ion collision and should prove valuable in the development of hydrodynamic models that quantitatively connect observations to the theory of the strong force.
The hyperfine splitting of antihydrogen has been measured and is consistent with expectations for atomic hydrogen.
A quantum simulation platform based on quantum dots is reported that can operate at relatively low temperatures, and its utility is shown by simulating a Fermi–Hubbard model.
An iron tetraphenylporphyrin complex is shown to catalyse the reduction of carbon dioxide to methane upon visible light irradiation at ambient temperature and pressure.
In situ infrared spectroscopy maps the occurrences of chemical bonds within tiny inclusions in 3,700-million-year-old metasedimentary rocks from West Greenland, finding greater evidence for organic life at this early date.
An anthrax-causing agent, Bacillus cereus biovar anthracis, is a persistent and widespread cause of death for a broad range of mammalian hosts in a tropical rainforest, with important implications for the conservation of mammals such as chimpanzees.
A report of high-depth, short-read sequencing and de novo assemblies for 150 individuals from 50 parent–offspring trios as part of establishing a population reference genome for the GenomeDenmark project.
Calcium imaging data from mice performing a virtual reality auditory decision-making task are used to analyse the population codes in primary auditory and posterior parietal cortex that support choice behaviour.
Imaging in living Arabidopsis roots reveals that protein complexes can change their conformation in a cell-type-dependent manner to regulate specific gene expression programs leading to precise specification and maintenance of particular cell fates within the root meristem.
Inhibition of histone deacetylation allows the transcription factor Ascl1 to bind to key gene loci in Müller glia and drive the functional generation of retinal neurons in adult mice.
Immunization of cows with a recombinant HIV envelope protein leads to the rapid development of potent, broadly neutralizing antibodies against HIV.
Glucose starvation activates AMPK via an AMP/ADP-independent mechanism that involves fructose-1,6-bisphosphate and aldolase.
De-novo-designed RNA molecules are used to construct cellular computing devices that can implement complex logic functions.