The Moon has a magmatic and thermal history that is distinct from that of the terrestrial planets
. Radioisotope dating of lunar samples suggests that most lunar basaltic magmatism ceased by around ...2.9-2.8 billion years ago (Ga)
, although younger basalts between 3 Ga and 1 Ga have been suggested by crater-counting chronology, which has large uncertainties owing to the lack of returned samples for calibration
. Here we report a precise lead-lead age of 2,030 ± 4 million years ago for basalt clasts returned by the Chang'e-5 mission, and a
U/
Pb ratio (µ value)
of about 680 for a source that evolved through two stages of differentiation. This is the youngest crystallization age reported so far for lunar basalts by radiometric dating, extending the duration of lunar volcanism by approximately 800-900 million years. The µ value of the Chang'e-5 basalt mantle source is within the range of low-titanium and high-titanium basalts from Apollo sites (µ value of about 300-1,000), but notably lower than those of potassium, rare-earth elements and phosphorus (KREEP) and high-aluminium basalts
(µ value of about 2,600-3,700), indicating that the Chang'e-5 basalts were produced by melting of a KREEP-poor source. This age provides a pivotal calibration point for crater-counting chronology in the inner Solar System and provides insight on the volcanic and thermal history of the Moon.
Metal–organic frameworks (MOFs) provide intriguing platforms for the design of responsive materials. It is challenging to mobilize as many components as possible of a MOF to collaboratively ...accomplish multiple responsive properties. Here, reversible photochromism, piezochromism, hydrochromism, ionochromism, and luminescence modulation of an ionic Eu(III) MOF is reported furnished by cationic electron‐deficient viologen units and exchangeable guest anions. Mechanistically, the extraordinarily versatile responsive properties are owed to electron transfer (ET), charge transfer (CT), and energy transfer, involving viologen as electron acceptor, anion as electron donor, luminescing Eu(III) as energy donor, and anion‐viologen CT complex or ET‐generated radical as energy acceptor (luminescence quencher). Moreover, guest anions and waters provide flexible handles to control the ET‐based responsive properties. Water release/reuptake or exchange with organic solvents can switch on/off the response to light, while reversible anion exchange can disenable or awaken the responses to pressure, light, and water release/reuptake. The impacts of water and anions on ET are justified by the high polarity and hydrogen‐bonding capability of water, the different electron donor strength of anions, and the strong I−‐viologen CT interactions. The rich responsive behaviors have great implications for applications such as pressure sensors, iodide detection, and chemical logic gates.
All components (metal, ligand, guest anion, and solvent) of the ionic metal–organic framework are mobilized to participate in stimuli‐induced electron transfer, charge transfer, or energy transfer, resulting in reversible piezochromism, hydrochromism, photochromism, ionochromism, and concomitant luminescence quenching. The responsive properties can be switched on/off through anion and solvent exchange.
The all‐inorganic nature of CsPbI3 perovskites allows to enhance stability in perovskite devices. Research efforts have led to improved stability of the black phase in CsPbI3 films; however, these ...strategies—including strain and doping—are based on organic‐ligand‐capped perovskites, which prevent perovskites from forming the close‐packed quantum dot (QD) solids necessary to achieve high charge and thermal transport. We developed an inorganic ligand exchange that leads to CsPbI3 QD films with superior phase stability and increased thermal transport. The atomic‐ligand‐exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Operando measurements of the temperature of the LEDs indicate that KI‐exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23 % with an electroluminescence emission centered at 640 nm (FWHM: ≈31 nm). These red LEDs provide an operating half‐lifetime of 10 h (luminance of 200 cd m−2) and an operating stability that is 6× higher than that of control devices.
Stable and efficient CsPbI3 perovskite light‐emitting diodes (PLEDs) are demonstrated by resurfacing perovskite with the aid of inorganic ligands (KI). The resurfaced perovskites show a 7× higher phase stability and higher thermal conductivity than in films with organic ligands. The PLEDs exhibit a record‐high external quantum efficiency (EQE) of ≈23 % and a 100‐fold improvement in the operating stability compared to previous EQE devices.
Polyporaceae is one of the most important families of Basidiomycota. Investigations on the species diversity, taxonomy and phylogeny of Polyporaceae in China are carried out. So far 217 species ...belonging to 42 genera are reported from China. Two new genera:
Amylosporia
gen. nov. and
Murinicarpus
gen. nov., twelve new species:
Coriolopsis dendriformis
sp. nov.,
C. hainanensis
sp. nov.,
Funalia cystidiata
sp. nov.,
Haploporus microsporus
sp. nov.,
Perenniporia citrinoalba
sp. nov.,
P. yinggelingensis
sp. nov.,
Picipes hainanensis
sp. nov.,
P. jiajinensis
sp. nov.,
P. pseudovarius
sp. nov.,
Trametes duplexa
sp. nov.,
T. ellipsoidea
sp. nov. and
T. stiptica
sp. nov., and six new combinations,
Amylosporia hattorii
comb. nov.,
Hornodermoporus latissimus
comb. nov.,
Murinicarpus subadustus
comb. nov.,
Picipes pumilus
comb. nov.,
Vanderbylia delavayi
comb. nov. and
Vanderbylia robiniophila
comb. nov., are proposed. All the species are described based on the Chinese collections. Keys to genera of Polyporaceae occurring in China and keys to species of each genus are provided. This monograph provides a revised classification of Polyporaceae in China according to the modern taxonomy. The phylogeny of Polyporaceae from China are reconstructed based on DNA sequences of multiple loci including the internal transcribed spacer (ITS) regions, the large subunit nuclear ribosomal RNA gene (nLSU), the small subunit nuclear ribosomal RNA gene (nSSU), the small subunit mitochondrial rRNA gene sequences (mtSSU), the translation elongation factor 1-α gene (TEF1), the β-tubulin gene (TBB1), the RNA polymerase II largest subunit (RPB1) and second largest subunit (RPB2) genes. In addition, full morphological descriptions, illustrations, color photographs, taxonomic notes, ecology and all the available sequences of Polyporaceae species found from China are provided.
A novel pillared-layered entangled luminescent metal-organic framework Zn
(bpdc)
(BPyTPE) (1) (BPyTPE = (E)-1,2-diphenyl-1,2-bis(4-(pyridin-4-yl)phenyl)ethene) has been designed and constructed. The ...solvent-free 1 exhibits strong blue-green emission with an excellent fluorescence quantum yield of 99% and provides a facile and reversible method to sensitively and quantitatively detect trace pesticide of 2,6-dichloro-4-nitroaniline.
Background and Aims
Tumor metastasis is a major factor of high recurrence and mortality in hepatocellular carcinoma (HCC), but its underlying mechanism remains elusive. We report that PDZ and LIM ...domain protein 1 (PDLIM1) is significantly down‐regulated in metastatic human HCC tissues, which predicts unfavorable prognosis, suggesting that PDLIM1 may play an important inhibitory role during HCC metastasis.
Approach and Results
Functional studies indicate that PDLIM1 knockdown induces epithelial‐to‐mesenchymal transition (EMT) of HCC cells, elevates their invasive capacity, and promotes metastasis in vitro and in vivo, whereas overexpression of PDLIM1 exhibits opposite phenotypes. Mechanistically, PDLIM1 competitively binds to the cytoskeleton cross‐linking protein alpha‐actinin 4 (ACTN4), leading to the disassociation of ACTN4 from F‐actin, thus preventing F‐actin overgrowth. In contrast, loss of PDLIM1 induces excessive F‐actin formation, resulting in dephosphorylation of large tumor suppressor kinase 1 and activation of Yes‐associated protein, thereby promoting HCC metastasis. Moreover, Asn145 (N145) of PDLIM1 is critical for its interaction with ACTN4, and N145A mutation abolishes its regulatory function in Hippo signaling and HCC metastasis.
Conclusions
Our findings indicate that PDLIM1 suppresses HCC metastasis by modulating Hippo signaling, suggesting that PDLIM1 may be a potential prognostic marker for metastatic HCC.
The activation of ferroptosis is a new effective way to treat drug-resistant solid tumors. Ferroptosis is an iron-mediated form of cell death caused by the accumulation of lipid peroxides. The ...intracellular imbalance between oxidant and antioxidant due to the abnormal expression of multiple redox active enzymes will promote the produce of reactive oxygen species (ROS). So far, a few pathways and regulators have been discovered to regulate ferroptosis. In particular, the cystine/glutamate antiporter (System X
c
−
), glutathione peroxidase 4 (GPX4) and glutathione (GSH) (System X
c
−
/GSH/GPX4 axis) plays a key role in preventing lipid peroxidation-mediated ferroptosis, because of which could be inhibited by blocking System X
c
−
/GSH/GPX4 axis. This review aims to present the current understanding of the mechanism of ferroptosis based on the System X
c
−
/GSH/GPX4 axis in the treatment of drug-resistant solid tumors.
The indicator displacement assay (IDA) is for the first time performed within a metal-organic framework (MOF) to achieve ultrasensitive fluorescence turn-on sensing. A Zr(iv) ion MOF (UiO-67-DQ-PsO) ...furnished with electron-deficient diquat units (DQ
, as the receptor) on the wall and electron-rich 1-pyrenesulfonate anions (PsO
, as the fluorescent indicator) in the pores was prepared by postsynthetic anion exchange. The MOF is capable of sensing alkylamines owing to the competing PsO
-DQ
and alkylamine-DQ
charge-transfer interactions, the former interaction causing a fluorescence OFF state and the latter displacing PsO
to trigger its emission. Significant advantages have been demonstrated for the IDA inside the MOF. The turn-on assay exhibits much higher sensitivity and anti-interference than the turn-off sensing using the MOF without indicators (the sensitivity is enhanced by as much as six orders of magnitude to the subnanomolar level). The integration of both the receptor and indicator in the porous solid enables facile regeneration and recyclability of the IDA ensemble. Furthermore, we show that the confined space provided by the MOF significantly enhances the supramolecular interactions to make possible the IDA impossible in solution. This work not only demonstrates a novel conceptual approach to fabricate superior fluorescence turn-on sensors using porous materials but also has important implications for supramolecular chemistry in porous materials.
Ionic metal–organic frameworks (IMOFs) that integrate synergistic Lewis‐acid sites (intrinsic metal centers of the frameworks) and nucleophilic anions (halides encapsulated within pores) are ...intriguing platforms for the design of fully heterogeneous catalytic systems for cycloaddition of CO2 to epoxides. A new, facile and versatile synthetic approach has been used to fabricate triazolium‐based IMOFs for the first time. The approach makes use of azide–alkyne click chemistry and subsequent N‐alkylation to post‐synthetically create a cationic triazolium ring and introduce exchangeable counteranions at the same time. The IMOFs are efficient and recyclable heterogeneous catalysts for CO2 conversion under mild and cocatalyst‐free conditions. In particular, the click‐accessible triazolium ring provides a handle to incorporate further functionality. The MIL‐101‐tzmOH‐Br catalyst, which integrates hydrogen‐bonding hydroxy groups besides metal centers and bromide anions, shows superior catalytic performance under mild conditions.
Click here to convert CO2! An ionic metal–organic framework (IMOF) bearing a CrIII center at the node, a hydroxy group grafted to the cationic linker and a bromide anion encapsulated within the pore is fabricated by facile azide–alkyne click chemistry. The multifunctional IMOF presents superior heterogeneous catalytic activity for cycloaddition of CO2 to epoxides under mild and cocatalyst‐free conditions.
The Mn(II) metal–organic framework with a viologen-based tetracarboxylate ligand exhibits reversible optical (color) and magnetic changes concomitant with stimuli-induced electron transfer from ...carboxylate to viologen. Compression causes a magnetic transformation from ferro- to ferrimagnetic, while water release/reuptake switches the magnetic behavior between ferro- and antiferromagnetic.
PDF
