Plant-beneficial Pseudomonas and Bacillus have been extensively studied and applied in biocontrol of plant diseases. However, there is less known about their interaction within two-strain synthetic communities (SynCom). Our study revealed that Pseudomonas protegens Pf-5 inhibits the growth of several Bacillus species, including Bacillus velezensis. We established a two-strain combination of Pf-5 and DMW1 to elucidate the interaction. In this combination, pyoluteorin conferred the competitive advantage of Pf-5. Noteworthy, pyoluteorin-deficient Pf-5 cooperated with DMW1 in biofilm formation, production of metabolites, root colonization, tomato bacterial wilt disease control, as well as in cooperation with beneficial bacteria in tomato rhizosphere, such as Bacillus spp. RNA-seq analysis and RT-qPCR also proved the pyoluteorin-deficient Pf-5 mutant improved cell motility and metabolite production. This study suggests that the cooperative effect of Bacillus-Pseudomonas consortia depends on the balance of pyoluteorin. Our finding needs to be considered in developing efficient SynCom in sustainable agriculture.
Abstract Highly efficient green and red perovskite quantum dots (PeQDs) light‐emitting diodes (PeQDLEDs) have been achieved. However, blue PeQDLEDs, especially those with the relatively short wavelengths (<470 nm) meeting National Television System Committee blue standard, have struggled to match the high efficiency and stability of their red and green counterparts. The main critical problems are the low photoluminescence quantum yield (PLQY) and poor stability of PeQDs, as well as the unfavorable device structure. Herein, a strategy of codoping Mn 2+ and Ni 2+ in CsPb(Br 1.8 Cl 1.2 ) is developed to improve the PLQY and thermal stability of PeQDs due to the defect passivation and enhanced formation energy. Meanwhile, the valence band position of PeQDs is elevated to reduce the hole injection barrier benefitting from the synergetic codoping strategy. As a result, the PeQDLEDs based on codoped PeQDs exhibit the maximum external quantum efficiency (EQE) of 3.31% with the emission peak located at 469 nm, and lifetime exceeding 8 min. The work provides a new avenue to achieve efficient and stable pure blue PeQDLEDs.
High entropy electrode materials have attracted extensive attention due to their excellent structure stability during cycling, leading to super long cycle life. However, the traditional equimolar strategy is not suitable for electrode materials if high-capacity is considered. Here, we successfully prepare LiNi0.5Mn1.5O4 cathode with high stability and long cycle life, by using a multiple-element doping strategy (medium entropy). Combining differential scanning calorimetry (DSC), Raman spectra and X-ray photoelectron spectroscopy, it is found that Co, Cr, Al co-doped LiNi0.5Mn1.5O4 (medium entropy sample) exhibits disordered structure ( ) with limited Mn3+ and enriched Al3+ on the surface, which can inhibit the dissolution of Mn2+ ions and surface side reaction. With disordered structure, the Li+ ion diffusivity in co-doped LiNi0.5Mn1.5O4 is improved, leading to better rate performance. In-situ X-ray diffraction indicates mostly solid solution process in co-doped LiNi0.5Mn1.5O4 and less volume change (5.4% vs. 5.8% in undoped sample) during charge-discharge. Owing to the better structure and interface stability, co-doped LiNi0.5Mn1.5O4 shows excellent cycle stability, with 92% capacity retention after 500 cycles at 1C rate. Meanwhile, the specific capacity of the medium entropy sample is even increased from 132 mAh/g to 138 mAh/g, proving the advantage of medium entropy strategy in electrode materials.
The ion migrations in lead halide perovskite (LHP)‐based devices are complex processes due to the generation of charges and migration multipaths. The migrating ions are generated mainly from element defects and dislocation defects, and transport along paths of element vacancies and grain boundaries. In this regard, it is of interest to investigate the different influences of the two defect types and paths. Herein, the current–voltage hysteresis and X‐ray photoelectron spectra of almost‐dislocation‐free LHP single crystals (LHPSCs) with different halide components are investigated. The ions cannot migrate in iodine‐based LHPSCs. A decrease in halide vacancy content in a bromine–chlorine‐based perovskite single crystal can effectively limit the ion migration. This study provides useful insights to understand the different dominant factors determining the ion migration in LHPs.
Dual-gate InGaZnO thin-film-transistors were fabricated to demonstrate their feasibility as phototransistors by fully exploiting the perovskite quantum dots (QDs) with superior quantum yield. Here, we show that by coupling the top-gate photo sensing polymethyl methacrylate (PMMA)/CsPbBr 3 QDs hybrid insulator with the classic SiO 2 bottom-gate insulator, the phototransistor can exhibit a combination of excellent detective performance (3.75 × 10 12 Jones detectivity and 1 × 10 3 A/W responsivity) and electrical performance (small 3-V threshold voltage, 0.53-V/decade substhreshold slop, and 0.1-V hysteretic threshold voltage's shift). Additionally, this dual-gate phototransistor exhibits high stability and accelerated detecting speed (<;100 μs) due to the inorganic perovskite QDs/PMMA hybrid gate insulator. Our results suggest that in a proper device architecture, perovskite nanomaterials can be promising candidates for cost-effective, high-performance phototransistor.
Background:: China's thin and extremely thin coal seam resources are widely distributed and rich in reserves. These coal seams account for 20% of the recoverable reserves, with 9.83 billion tons of industrial reserves and 6.15 billion tons of recoverable reserves. Objective: Due to the complex geological conditions of the thin coal seam, the plow mining method cannot be effectively popularized, and the drum mining method is difficult to be popularized and applied in small and medium-sized coal mines, so it is necessary to find other more advantageous alternative mining methods. Methods: The equipment integrates mining operations, conveying operations, and supporting operations, and is suitable for mining short and extremely thin coal seam with a height of 0.35m-0.8m and width of 2m-20m. It has the advantages of the low body of the shearer, no additional support on the working face, and small underground space. The mining efficiency of thin coal seam and very thin coal seam can be improved and the mining cost can be reduced. Results: Thin coal seam shear mining combines mining, conveying, and supporting processes together and has the advantages of a low fuselage, no extra support required for the working face, and feasibility in a small underground space. Conclusion: The summarized mining method can improve the mining efficiency of thin and extremely thin coal seams, reduce mining costs, and incorporate green mining practices, which take both mining economy and safety into account.
The irregular shape of mineral particles directly affects the angle of repose, bulk density and the interaction behavior between particles and contact surface. This paper presents a dataset of spatial data and shape parameters collected from 172 coal and gangue particles. The investigated materials were coal and gangue particles. The sample sizes were 37 (gangue particles) and 135 (coal particles). The particle surface models were obtained by Wiiboox 3D scanner and Reeyee_v2.5.0 software. Each particle was scanned 8 times in different directions. The final scanning model was obtained by stacking two scanning surfaces, and the shape parameters such as length ratio, flatness ratio and Zingg index were obtained by the final scanning model. This dataset is particularly useful for researchers and engineers, who want to investigate the shape of coal and gangue particles, or who want to test or benchmark measurement methods concerning the three-dimensional morphology of particles.
The irregular shape of mineral particles directly affects the angle of repose, bulk density and the interaction behavior between particles and contact surface. This paper presents a dataset of spatial data and shape parameters collected from 172 coal and gangue particles. The investigated materials were coal and gangue particles. The sample sizes were 37 (gangue particles) and 135 (coal particles). The particle surface models were obtained by Wiiboox 3D scanner and Reeyee_v2.5.0 software. Each particle was scanned 8 times in different directions. The final scanning model was obtained by stacking two scanning surfaces, and the shape parameters such as length ratio, flatness ratio and Zingg index were obtained by the final scanning model. This dataset is particularly useful for researchers and engineers, who want to investigate the shape of coal and gangue particles, or who want to test or benchmark measurement methods concerning the three-dimensional morphology of particles.
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