Large-scale studies across the Nature journals create one of the world’s most comprehensive single-cell atlases of Alzheimer’s disease and related neuropsychiatric conditions

Take a second and turn it into trillions of moments. Measure each one. That’s how precisely an atomic clock at Singapore’s Centre for Quantum Technologies (CQT) keeps time – and with record-making accuracy, according to results published in Nature on 23 September.

Due to its unique orbital characteristics, the retrograde geosynchronous orbit (RGSO) has demonstrated substantial potential in the fields of space surveillance and space situational awareness. However, constrained by the direction of Earth's rotation and the tracking, telemetry, and control capabilities of launch sites, the direct launch of satellites into RGSO from Earth must overcome an additional velocity increment of more than approximately 4 km/s, entailing enormous fuel consumption and significant engineering difficulty. Conventional approaches employ lunar gravity assists to transfer from low Earth orbit or geosynchronous transfer orbit to RGSO, yet the velocity increment requirements remain relatively high and the transfer paths are limited. With the increasing development of cislunar space in recent years, an increasing number of spacecraft on cislunar orbits are being launched and deployed. If a spacecraft is placed on standby in cislunar orbits, whether the sensitive dynamical characteristics of the three-body problem in cislunar space can be exploited to achieve low-energy transfer to RGSO has become a key issue for expanding the utilization value of cislunar space assets.

Researchers at the University of Central Florida and Sage Bionetworks used artificial intelligence to identify about 200 FDA-approved drugs with potential to treat rare nerve tumors called schwannomas, narrowing the list to 10 promising candidates.

Climate change is causing many fruit trees to flower earlier, increasing their exposure to damaging late spring frosts. A study led by the University of Göttingen shows that the plant growth regulator ethephon can delay flowering in Kordia – a variety of sweet cherry – potentially protecting blossoms and developing fruitlets from frost. The treatment did not significantly delay flowering in a second sweet cherry or two apple varieties, highlighting the importance of crop and cultivar selection. The results were published in BMC Plant Biology.

Michael Twardowski, Ph.D., an internationally recognized expert in optical oceanography and marine sensing technologies, has been named the Edwin A. Link Ocean Technology and Defense Endowed Professor at Florida Atlantic University’s Harbor Branch Oceanographic Institute. 

Tiny plantlike organisms called phytoplankton that form the base of marine food webs topped by orcas, whales, and sharks usually get eaten or slowly sink to the seafloor, carrying carbon as they go. 

Across most of the ocean, the descent from sunlit surface layers takes weeks. But in the Arctic’s Chukchi Sea, scientists have found that a convergence of currents pushes phytoplankton from under the ice to the seafloor at four times the usual speed. 

Two new papers led by researchers in the lab of Stanford biological oceanographer Kevin Arrigo detail this unusual descent and reveal that blooms of phytoplankton, which use energy from the sun to grow, can be 10 times denser in the darker waters below thick sea ice than out in the open water.