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"Wang, E"
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Of ants and dinosaurs
\"In a sunlit clearing in central Gondwana, on an otherwise ordinary day in the late Cretaceous, the seeds of Earth's first and greatest civilization were sown in the grisly aftermath of a Tyrannosaurus' lunch.Throughout the universe, intelligence is a rare and fragile commodity - a fleeting glimmer in the long night of cosmic history. That Earth should harbour not just one but two intelligent species at the same time, defies the odds. That these species, so unalike - and yet so complementary - should forge an alliance that kindled a civilization defies logic. But time is endless and everything comes to pass eventually...The alliance between ants and dinosaurs, was of course, based on dentistry. Yet from such humble beginnings came writing, mathematics, computers, fusion, antimatter and even space travel - a veritable Age of Wonder! But such magnificent industry comes at a price - a price paid first by Earth's biosphere, and then by all those dependent on it. And yet the Dinosaurs refused to heed the Ants' warning of impending ecological collapse, leaving the Ant Federation facing a single dilemma: destroy the dinosaurs, destroy a civilization... or perish alongside them?\"--Publisher.
Image segmentation evaluation: a survey of methods
Image segmentation is a prerequisite for image processing. There are many methods for image segmentation, and as a result, a great number of methods for evaluating segmentation results have also been proposed. How to effectively evaluate the quality of image segmentation is very important. In this paper, the existing image segmentation quality evaluation methods are summarized, mainly including unsupervised methods and supervised methods. Based on hot issues, the application of metrics in natural, medical and remote sensing image evaluation is further outlined. In addition, an experimental comparison for some methods were carried out and the effectiveness of these methods was ranked. At the same time, the effectiveness of classical metrics for remote sensing and medical image evaluation is also verified.
Journal Article
Sleep fragmentation exacerbates myocardial ischemia‒reperfusion injury by promoting copper overload in cardiomyocytes
Sleep disorders increase the risk and mortality of heart disease, but the brain-heart interaction has not yet been fully elucidated. Cuproptosis is a copper-dependent type of cell death activated by the excessive accumulation of intracellular copper. Here, we showed that 16 weeks of sleep fragmentation (SF) resulted in elevated copper levels in the male mouse heart and exacerbated myocardial ischemia–reperfusion injury with increased myocardial cuproptosis and apoptosis. Mechanistically, we found that SF promotes sympathetic overactivity, increases the germination of myocardial sympathetic nerve terminals, and increases the level of norepinephrine in cardiac tissue, thereby inhibits VPS35 expression and leads to impaired ATP7A related copper transport and copper overload in cardiomyocytes. Copper overload further leads to exacerbated cuproptosis and apoptosis, and these effects can be rescued by excision of the sympathetic nerve or administration of copper chelating agent. Our study elucidates one of the molecular mechanisms by which sleep disorders aggravate myocardial injury and suggests possible targets for intervention.
Sleep disorders increase the risk and mortality of heart disease. Here, the authors show that sleep fragmentation results in elevated copper levels in the male mouse heart and exacerbates myocardial ischemia–reperfusion injury with increased myocardial cuproptosis and apoptosis.
Journal Article
Coordination assembly of 2D ordered organic metal chalcogenides with widely tunable electronic band gaps
Engineering the band gap chemically by organic molecules is a powerful tool with which to optimize the properties of inorganic 2D materials. The obtained materials are however still limited by inhomogeneous compositions and properties at nanoscale and small adjustable band gap ranges. To overcome these problems in the traditional exfoliation and then organic modification strategy, an organic modification and then exfoliation strategy was explored in this work for preparing 2D organic metal chalcogenides (OMCs). Unlike the reported organically modified 2D materials, the inorganic layers of OMCs are fully covered by long-range ordered organic functional groups. By changing the electron-donating ability of the organic functional groups and the electronegativity of the metals, the band gaps of OMCs were varied by 0.83 eV and their conductivities were modulated by 9 orders of magnitude, which are 2 and 10
7
times higher than the highest values observed in the reported chemical methods, respectively.
Here, the authors report a new class of 2D materials with inorganic metal chalcogenide layers covered by long-range ordered organic groups. The range of modulation on their band gaps and electrical conductivities are two times and 7 orders of magnitude better than the highest values reported so far.
Journal Article
An R2R3-type MYB transcription factor, GmMYB29, regulates isoflavone biosynthesis in soybean
Isoflavones comprise a group of secondary metabolites produced almost exclusively by plants in the legume family, including soybean [Glycine max (L.) Merr.]. They play vital roles in plant defense and have many beneficial effects on human health. Isoflavone content is a complex quantitative trait controlled by multiple genes, and the genetic mechanisms underlying isoflavone biosynthesis remain largely unknown. Via a genome-wide association study (GWAS), we identified 28 single nucleotide polymorphisms (SNPs) that are significantly associated with isoflavone concentrations in soybean. One of these 28 SNPs was located in the 5'-untranslated region (5'-UTR) of an R2R3-type MYB transcription factor, GmMYB29, and this gene was thus selected as a candidate gene for further analyses. A subcellular localization study confirmed that GmMYB29 was located in the nucleus. Transient reporter gene assays demonstrated that GmMYB29 activated the IFS2 (isoflavone synthase 2) and CHS8 (chalcone synthase 8) gene promoters. Overexpression and RNAi-mediated silencing of GmMYB29 in soybean hairy roots resulted in increased and decreased isoflavone content, respectively. Moreover, a candidate-gene association analysis revealed that 11 natural GmMYB29 polymorphisms were significantly associated with isoflavone contents, and regulation of GmMYB29 expression could partially contribute to the observed phenotypic variation. Taken together, these results provide important genetic insights into the molecular mechanisms underlying isoflavone biosynthesis in soybean.
Journal Article
ZMYND8 protects breast cancer stem cells against oxidative stress and ferroptosis through activation of NRF2
Breast cancer stem cells (BCSCs) mitigate oxidative stress to maintain their viability and plasticity. However, the regulatory mechanism of oxidative stress in BCSCs remains unclear. We recently found that the histone reader ZMYND8 was upregulated in BCSCs. Here, we showed that ZMYND8 reduced ROS and iron to inhibit ferroptosis in aldehyde dehydrogenase-high (ALDHhi) BCSCs, leading to BCSC expansion and tumor initiation in mice. The underlying mechanism involved a two-fold posttranslational regulation of nuclear factor erythroid 2-related factor 2 (NRF2). ZMYND8 increased stability of NRF2 protein through KEAP1 silencing. On the other hand, ZMYND8 interacted with and recruited NRF2 to the promoters of antioxidant genes to enhance gene transcription in mammospheres. NRF2 phenocopied ZMYND8 to enhance BCSC stemness and tumor initiation by inhibiting ROS and ferroptosis. Loss of NRF2 counteracted ZMYND8's effects on antioxidant genes and ROS in mammospheres. Interestingly, ZMYND8 expression was directly controlled by NRF2 in mammospheres. Collectively, these findings uncover a positive feedback loop that amplifies the antioxidant defense mechanism sustaining BCSC survival and stemness.
Journal Article
Evidence for metastable photo-induced superconductivity in K3C60
Excitation of high-Tc cuprates and certain organic superconductors with intense far-infrared optical pulses has been shown to create non-equilibrium states with optical properties that are consistent with transient high-temperature superconductivity. These non-equilibrium phases have been generated using femtosecond drives, and have been observed to disappear immediately after excitation, which is evidence of states that lack intrinsic rigidity. Here we make use of a new optical device to drive metallic K3C60 with mid-infrared pulses of tunable duration, ranging between one picosecond and one nanosecond. The same superconducting-like optical properties observed over short time windows for femtosecond excitation are shown here to become metastable under sustained optical driving, with lifetimes in excess of ten nanoseconds. Direct electrical probing, which becomes possible at these timescales, yields a vanishingly small resistance with the same relaxation time as that estimated by terahertz conductivity. We provide a theoretical description of the dynamics after excitation, and justify the observed slow relaxation by considering randomization of the order-parameter phase as the rate-limiting process that determines the decay of the light-induced superconductor.Evidence for light-induced superconductivity in K3C60 was limited to optical methods due to the short lifetime of the phase. Extending the lifetime from picoseconds to nanoseconds now allows measurement of its negligible electrical resistance.
Journal Article
Effects of ciprofol on postoperative delirium and outcomes in older patients undergoing major thoracic surgery: protocol for a multicentre, prospective, single-blinded, randomised controlled study
IntroductionPostoperative delirium (POD) is a notable complication in older adults undergoing major thoracic surgery and is associated with poor clinical outcomes. Ciprofol, an innovative sedative known for its haemodynamic stability, holds the potential to lower the risk of POD. However, high-quality evidence supporting this claim is limited. The objective of this study is to evaluate the effect of ciprofol compared with propofol on the incidence of POD and postoperative outcomes in older patients undergoing thoracic surgeries.Methods and analysisThis multicentre, prospective, single-blinded, randomised controlled trial will recruit patients aged ≥65 years scheduled for elective thoracoscopic lobectomy or segmentectomy, with an anticipated anaesthesia duration of at least 2 hours. Participants will be randomised to receive either ciprofol (0.25–1.5 mg/kg/hour) or propofol (1–6 mg/kg/hour) in a 1:1 ratio. The primary outcome is the incidence of POD within 7 days postoperatively, assessed via the three-dimensional confusion assessment method. Secondary outcomes include emergence delirium assessed using the confusion assessment method for the intensive care unit, the incidence of combined adverse events during induction and maintenance of anaesthesia, duration of intraoperative hypotension, minimum mean intraoperative arterial pressure, duration of Wavelet Index <40, other adverse events identified during the follow-up period, length of stay, first exhaust time and postoperative first time to taking food. A non-inferiority margin of 5% is applied for sample size calculation, yielding a total of 214 participants, adjusted for a 10% attrition rate.Ethics and disseminationApproval on ethical grounds has been received from the ethics committee of Xuanwu Hospital, Capital Medical University (LinYanShen (2024)-NO.201–003-Revised V.1). We will publish the findings in peer-reviewed journals.Trial registration number NCT06674226.
Journal Article