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The cover shows a model of a solar eruption in progress. In this week's issue, Tahar Amari and his colleagues suggest that one phenomenon could control the nature and behaviour of all such eruptions. There are two types of eruption: eruptive, which result in coronal mass ejections, and confined, which do not. The exact origin of confined eruptions has been hotly debated between two alternatives: topological complexity in the magnetic structure above the Sun's surface, or an unstable twisted magnetic flux rope. Amari and his team show that the latter process is more likely. To study this, the researchers focused on an eruption that took place in October 2014, predicting its evolution using a two-stage model. Their work reveals a strong multilayer magnetic cage (orange) in which a twisted flux rope (blue) develops. The magnetic energy of the rope increases over the course of several hours before the eruption, but is still not enough to break all of the layers of the cage. However, the twist in the rope is enough to trigger an instability that results in partial destruction of the cage. The resistance of the cage to the assault from the rope determines the type and amount of energy released in the eruption. If the rope is stronger than the cage and can break free, the result is eruptive; if the cage is stronger than the rope, the eruption is confined. Understanding the conditions that lead to solar eruptions may help to predict the events that might affect satellites, communications and ground-based power generation. Cover image: Tahar Amari/Centre de Physique Théorique, CNRS-Ecole Polytechnique
Analysis and modelling of locomotor characteristics of two pursuit predator–prey pairs show that hunts at lower speeds enable prey to use their maximum manoeuvring capacity and favour prey survival.
In a basket trial design, the efficacy of the pan-HER kinase inhibitor neratinib is tested in patients with 21 different tumour types, and responses are determined by mutation and tissue type, and are restricted to HER2-mutant cancers.
A kinetic model is proposed to predict the probability of dG•dT misincorporation across different polymerases, and provides mechanisms for sequence-dependent misincorporation.
Cryo-electron microscopy and single-molecule studies reveal that the adaptors BICDR1 and HOOK3 recruit two dynein molecules to dynactin and thereby increase the force and speed of the dynein–dynactin microtubule motor.
The observed electromagnetic emission from GW170817 suggests that a ‘cocoon’ of mildly relativistic material was released as a jet transferred its energy to the neutron-rich dynamical ejecta from the merger.
Measurements and modelling of a large confined eruption on the Sun show that its evolution is controlled by a multilayer magnetic cage containing a twisted flux rope, which can sometimes be ejective.
Many-body two- and three-string states are realized experimentally in the antiferromagnetic Heisenberg–Ising chain SrCo2V2O8 in strong longitudinal magnetic fields.
A process is described for the transformation of bulk wood into a low-cost, strong, tough, lightweight structural material, by the partial removal of lignin and hemicellulose followed by hot-pressing to densify the natural wood.
Contrary to the hopes of policymakers, fossil fuel subsidy removal would have only a small impact on global energy demand and carbon dioxide emissions and would not increase renewable energy use by 2030.
A dated phylogeny and spatial distribution data for Chinese angiosperms show that eastern China has tended to act as a refugium for older taxa whereas western China has acted as a centre for their evolutionary diversification.
Gene enhancer knockout phenotypes and analysis of enhancer activity patterns show that developmental genes are regulated by multiple redundant enhancers in mouse embryos.
The activity of dopamine neurons in the substantia nigra pars compacta before movement initiation affects the probability and vigour of future movements.
Measurement of human plasma amyloid-β biomarkers using immunoprecipitation coupled with mass spectrometry reliably predicts individual brain amyloid-β status and has potential clinical utility.
Analysis at high temporal and spatial resolution shows that the number and dynamics of SNARE proteins available during exocytosis determines the size and stability of fusion pores.