Search Publications
Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm
Tsuchiya, Fuminori; Yoshida, Nao; Terada, Naoki +11 more
Dust storms on Mars play a role in transporting water from its lower to upper atmosphere, seasonally enhancing hydrogen escape. However, it remains unclear how water is diurnally transported during a dust storm and how its elements, hydrogen and oxygen, are subsequently influenced in the upper atmosphere. Here, we use multi-spacecraft and space te…
BepiColombo mission confirms stagnation region of Venus and reveals its large extent
André, N.; Fedorov, A.; Barabash, S. +42 more
The second Venus flyby of the BepiColombo mission offer a unique opportunity to make a complete tour of one of the few gas-dynamics dominated interaction regions between the supersonic solar wind and a Solar System object. The spacecraft pass through the full Venusian magnetosheath following the plasma streamlines, and cross the subsolar stagnatio…
The Tharsis mantle source of depleted shergottites revealed by 90 million impact craters
Baratoux, D.; Towner, M. C.; Lagain, A. +8 more
The only martian rock samples on Earth are meteorites ejected from the surface of Mars by asteroid impacts. The locations and geological contexts of the launch sites are currently unknown. Determining the impact locations is essential to unravel the relations between the evolution of the martian interior and its surface. Here we adapt a Crater Det…
Electromechanical coupling mechanism for activation and inactivation of an HCN channel
Dai, Gucan; Aman, Teresa K.; DiMaio, Frank +1 more
Pacemaker hyperpolarization-activated cyclic nucleotide-gated (HCN) ion channels exhibit a reversed voltage-dependent gating, activating by membrane hyperpolarization instead of depolarization. Sea urchin HCN (spHCN) channels also undergo inactivation with hyperpolarization which occurs only in the absence of cyclic nucleotide. Here we applied tra…
Distinct axial and lateral interactions within homologous filaments dictate the signaling specificity and order of the AIM2-ASC inflammasome
Matyszewski, Mariusz; Zheng, Weili; Lueck, Jacob +5 more
Inflammasomes are filamentous signaling platforms integral to innate immunity. Currently, little is known about how these structurally similar filaments recognize and distinguish one another. A cryo-EM structure of the AIM2PYD filament reveals that the architecture of the upstream filament is essentially identical to that of the adaptor…
Geology of the InSight landing site on Mars
Rodriguez, S.; Forget, F.; Hauber, E. +44 more
The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) spacecraft landed successfully on Mars and imaged the surface to characterize the surficial geology. Here we report on the geology and subsurface structure of the landing site to aid in situ geophysical investigations. InSight landed in a degraded impact cr…
X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary
Shu, Xinwen; Jiang, Ning; Li, Shuo +8 more
Optical transient surveys have led to the discovery of dozens of stellar tidal disruption events (TDEs) by massive black hole in the centers of galaxies. Despite extensive searches, X-ray follow-up observations have produced no or only weak X-ray detections in most of them. Here we report the discovery of delayed X-ray brightening around 140 days …
Phosphorus-rich stars with unusual abundances are challenging theoretical predictions
Masseron, Thomas; García-Hernández, D. A.; Zamora, Olga +4 more
Almost all chemical elements have been made by nucleosynthetic reactions in various kind of stars and have been accumulated along our cosmic history. Among those elements, the origin of phosphorus is of extreme interest because it is known to be essential for life such as we know on Earth. However, current models of (Galactic) chemical evolution u…
Structural insights into the mechanism of rhodopsin phosphodiesterase
Ikuta, Tatsuya; Shihoya, Wataru; Sugiura, Masahiro +9 more
Rhodopsin phosphodiesterase (Rh-PDE) is an enzyme rhodopsin belonging to a recently discovered class of microbial rhodopsins with light-dependent enzymatic activity. Rh-PDE consists of the N-terminal rhodopsin domain and C-terminal phosphodiesterase (PDE) domain, connected by 76-residue linker, and hydrolyzes both cAMP and cGMP in a light-dependen…
Evidence of ubiquitous Alfvén pulses transporting energy from the photosphere to the upper chromosphere
Wang, Yuming; Liu, Jiajia; Erdélyi, Robert +2 more
The multi-million degree temperature increase from the middle to the upper solar atmosphere is one of the most fascinating puzzles in plasma-astrophysics. Although magnetic waves might transport enough energy from the photosphere to heat up the local chromosphere and corona, observationally validating their ubiquity has proved challenging. Here, w…