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| 1 | New insights into eutrophication management:Importance of temperature and water residence time显示文摘Eutrophication and harmful cyanobacterial blooms threaten water resources all over the world.There is a great controversy about controlling only phosphorus or controlling both nitrogen and phosphorus in the management of lake eutrophication.The primary argument against the dual nutrients control of eutrophication is that nitrogen fixation can compensate the nitrogen deficits.Thus,it is of great necessary to study the factors that can significantly affect the nitrogen fixation.Due to the difference of climate and human influence,the water quality of different lakes(such as water temperature,N:P ratio and water residence time)is also quite different.Numerous studies have reported that the low N:P ratio can intensify the nitrogen fixation capacities.However,the effects of temperature and water residence time on the nitrogen fixation remain unclear.Thus,30 shallows freshwater lakes in the eastern plain of China were selected to measure dissolved N_(2) and Ar concentrations through N_(2):Ar method using a membrane inlet mass spectrometer to quantify the nitrogen fixation capacities and investigate whether the temperature and water residence time have a great impact on nitrogen fixation.The results have shown that the short lake water residence time can severely inhibit the nitrogen fixation capacities through inhibiting the growth of nitrogenfixing cyanobacteria,changing the N:P ratio and resuspending the solids from sediments.Similarly,lakes with low water temperature also have a low nitrogen fixation capacity,suggesting that controlling nitrogen in such lakes is feasible if the growth of cyanobacteria is limited by nitrogen. | Feng Zhao Xu Zhan Hai Xu Guangwei Zhu Wei Zou Mengyuan Zhu Lijuan Kang Yulong Guo Xingchen Zhao Zicong Wang Wei Tang | 2022 | Journal of Environmental Sciences2022，34，1： | 2 |
| 2 | Step‑by‑Step Modulation of Crystalline Features and Exciton Kinetics for 19.2%Efficiency Ortho‑Xylene Processed Organic Solar Cells显示文摘With plenty of popular and effective ternary organic solar cells(OSCs)construction strategies proposed and applied,its power conversion efficiencies(PCEs)have come to a new level of over 19%in single-junction devices.However,previous studies are heavily based in chloroform(CF)leaving behind substantial knowledge deficiencies in understanding the influence of solvent choice when introducing a third component.Herein,we present a case where a newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy,named BTP-BO-3FO with enlarged bandgap,brings different morphological evolution and performance improvement effect on host system PM6:BTP-eC9,processed by CF and ortho-xylene(o-XY).With detailed analyses supported by a series of experiments,the best PCE of 19.24%for green solvent-processed OSCs is found to be a fruit of finely tuned crystalline ordering and general aggregation motif,which furthermore nourishes a favorable charge generation and recombination behavior.Likewise,over 19%PCE can be achieved by replacing spin-coating with blade coating for active layer deposition.This work focuses on understanding the commonly met yet frequently ignored issues when building ternary blends to demonstrate cutting-edge device performance,hence,will be instructive to other ternary OSC works in the future. | Bosen Zou Weiwei Wu Top Archie Dela Pena Ruijie Ma Yongmin Luo Yulong Hai Xiyun Xie Mingjie Li Zhenghui Luo Jiaying Wu Chuluo Yang Gang Li He Yan | 2024 | Nano-Micro Letters2024，16，2： | 0 |
| 3 | Phonon anharmonicity and thermal conductivity of two-dimensional van der Waals materials: A review显示文摘Two-dimensional(2D) van der Waals(vdW) materials have extraordinary thermal properties due to the effect of quantum confinement, making them promising for thermoelectric energy conversion and thermal management in microelectronic devices.In this review, the mechanism of phonon anharmonicity originating from three-and four-phonon interactions is derived. The phonon anharmonicity of 2D vdW materials, involving the Grüneisen parameter, phonon lifetime, and thermal conductivity, is summarized and derived in detail. The size-dependent thermal conductivity of representative 2D vdW materials is discussed experimentally and theoretically. This review will present fundamental and advanced knowledge on how to evaluate the phonon anharmonicity in 2D vdW materials, which will aid the design of new structures and materials for applications related to energy transfer and conversion. | Xuefei Yan Bowen Wang Yulong Hai Devesh RKripalani Qingqing Ke Yongqing Cai | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，11： | 0 |
| 4 | Paeonol reduces microbial metabolite α-hydroxyisobutyric acid to alleviate the ROS/TXNIP/NLRP3 pathway-mediated endothelial inflammation in atherosclerosis mice显示文摘Gut microbiota dysbiosis is an avenue for the promotion of atherosclerosis(AS)and this effect is mediated partly via the circulating microbial metabolites.More microbial metabolites related to AS vascular inflammation,and the mechanisms involved need to be clarified urgently.Paeonol(Pae)is an active compound isolated from Paeonia suffruticoas Andr.with anti-As inflammation effect.However,considering the low oral bioavailability of Pae,it is worth exploring the mechanism by which Pae reduces the harmful metabolites of the gut microbiota to alleviate AS.In this study,ApoE--mice were fed a high-fat diet(HFD)to establish an AS model.AS mice were administrated with Pae(200 or 400 mg:kg')by oral gavage and fecal microbiota transplantation(FMT)was conducted.16S rDNA sequencing was performed to investigate the composition of the gut microbiota,while metabolomics analysis was used to identify the metabolites in serum and cecal contents.The results indicated that Pae significantly improved AS by regulating gut microbiota composition and microbiota metabolic profile in AS mice.We also identified a-hydroxyisobutyric acid(HIBA)as a harmful microbial metabolite reduced by Pae.HIBA supplementation in drinking water promoted AS inflammation in AS mice.Furthermore,vascular endothelial cells(VECs)were cultured and stimulated by HIBA.We verified that HIBA stimulation increased intracellular ROS levels,thereby inducing VEC inflammation via the TXNIP/NLRP3 pathway.In sum,Pae reduces the production of the microbial metabolite HIBA,thus alleviating the ROS/TXNIP/NLRP3 pathway-mediated endothelial inflammation in AS.Our study innovatively confirms the mechanism by which Pae reduces the harmful metabolites of gut microbiota to alleviate AS and proposes HIBA as a potential biomarker for AS clinical judgment. | LIU Yarong WU Hongfei WANG Tian SHI Xiaoyan HE Hai HUANG Hanwen YANG Yulong DAI Min | 2023 | Chinese Journal of Natural Medicines2023，21，10： | 0 |
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