Study of the combined effects of strong electronic correlations with spin-orbit coupling (SOC) represents a central issue in quantum materials research. Predicting emergent properties represents a huge theoretical problem since the presence of SOC implies that the spin is not a good quantum number. Existing theories propose the emergence of a multitude of exotic quantum phases, distinguishable by either local point symmetry breaking or local spin expectation values, even in materials with simple cubic crystal structure such as Ba2NaOsO6. Experimental tests of these theories by local probes are highly sought for. Our local measurements designed to concurrently probe spin and orbital/lattice degrees of freedom of Ba2NaOsO6 provide such tests. Here we show that a canted ferromagnetic phase which is preceded by local point symmetry breaking is stabilized at low temperatures, as predicted by quantum theories involving multipolar spin interactions.

Respiration, the core of mitochondrial metabolism, depends on the function of five respiratory complexes. Many respiratory chain-related proteins are encoded by the mitochondrial genome and their RNAs undergo post-transcriptional modifications by nuclear genome-expressed factors, including pentatricopeptide repeat (PPR) proteins. Maize () is a classic mutant with small kernels and delayed development. Through positional cloning, we found that encodes an E-subgroup PPR protein localized in mitochondria. Sequencing analysis indicated that Dek10 is responsible for the C-to-U editing at-61, -62, and-550 sites, which are specific editing sites in monocots. The defects of these editing sites result in significant reduction of Nad3 and the loss of Cox2. Interestingly, the assembly of complex I was not reduced, but its NADH dehydrogenase activity was greatly decreased. The assembly of complex IV was significantly reduced. Transcriptome and transmission electron microscopy (TEM) analysis revealed that proper editing of and is critical for mitochondrial functions, biogenesis, and morphology. These results indicate that the E-subgroup PPR protein Dek10 is responsible for multiple editing sites in and, which are essential for mitochondrial functions and plant development in maize.

No abstract

This paper aims to improve the hydrothermal stability and catalytic activity of metal–organic frameworks (MOFs), which are believed to play an important role in the practical applications of MOFs in catalysis. Our strategy is to incorporate graphite oxide into a typical MOF, namely HKUST-1 (Cu3(BTC)2, BTC = 1,3,5-benzenetricarboxylic acid; HKUST = Hong Kong University of Science and Technology), and the properties of MOF are successfully tailored by use of this strategy. The obtained MOF/graphite oxide composites show enhanced porosity with high surface areas and some meso/macropores. For the composite containing 8.7 wt % of graphite oxide, the surface area reaches 1257 m2 g–1, which is obviously higher than pure HKUST-1 (841 m2 g–1). The pore structure of composites favors the access of reactant molecules to active sites and accelerates mass transfer in channels. Furthermore, the incorporation of graphite oxide creates a more hydrophobic environment surrounding metallic sites, which prevents the coordination bonds from attacking by water molecules and presents better affinity of active sites to organic reactants. Hence, the hydrothermal stability of MOF as well as the catalytic performance with regard to both activity and reaction rate are greatly improved. For the composite incorporating 8.7 wt % of graphite oxide, the conversion of styrene oxide in the ring-opening reaction can reach 74.1% after reaction for only 20 min, which is much higher than pure HKUST-1 (10.7%). More importantly, the catalytic activity can be well recovered without any loss even after six cycles. The excellent hydrothermal stability, catalytic activity, and reusability make our materials highly promising for use as heterogeneous catalysts in practical applications.

Highlights Most of the patients with COVID-19 who need to be admitted to hospital are older. Older patients with COVID-19 had much more co-morbidity, complications and mortality. Age, SOFA score, APACHEⅡ score, platelet count＜125 × 109/L, d-dimer, creatinine＞133 μmol/L, interleukin-6, and lung consolidation on admission were independent risk factors for severe cases among older patients with COVID-19. More attention should be paid to older patients with COVID-19.

A typical metal–organic framework, MOF-5, was hybridized with attapulgite, producing the composites with enhanced hydrostability and catalytic performance.

In the top panel of Fig. 4D, the bottom part of Stage I and the top part of Stage II-III images show an overlap. This is permissible since spermatogenesis is a continuous process from stage I to stage XII in seminiferous tubules and the panels are all from the same animal. The authors have, however, added an explanation to the legend to avoid any misunderstanding. The authors mistakenly used the wrong merge image for WT histone H4 in the bottom row when assembling Fig. 2C. The corrected and original figure panels are shown below.

No abstract