检索结果-南通市图书馆

Science China Chemistry 2025年

作者： Wenwen Zhang Huixia xuan Xiaofei xu Jiaming Lou Qingbao Guan Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional Materials College of Materials Science and Engineering Shanghai Key Laboratory of Lightweight Composite Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine Donghua University

For room temperature self-healing triboelectric nanogenerators（TENGs）, the inherent contradiction between mechanical strength and self-healing properties was an urgent problem to be solved. Based on the phenol-carbamate bond, this paper proposed a strategy to design a new molecular structure and coordinate the triple dynamic bonds, which provided a feasible strategy to solve this contradiction. With polytetramethylene ether glycol（M_n= 1,000） as the soft segment in the main chain of polyurethane（PU）, meanwhile methylene diphenyl diisocyanate and 4,4′-dihydroxybiphenyl（BP） as the hard segment and chain extension agent, respectively, the combination of tetrad benzene ring endowed the resultant 4BP-PU with π-π interaction. The effective reversible dissociation and association with hydrogen bond not only bestowed 4BP-PU with high mechanical strength（16.14 MPa）, but also promoted high self-healing efficiency（94.8%） at room temperature. 4BP-PU was selected as the elastic substrate between polydimethylsiloxane and copper sheet to prepare a self-healing TENG to collect energy from natural ***, the rational molecular structure design provided new ideas for developing self-healing materials and fabricating energy harvest electronics.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

农田栽参的研究进展及优势分析

世界科学技术-中医药现代化 2016年第11期18卷 1981-1987页

作者：牛玮浩徐江董林林李西文张连娟陈士林中国中医科学院中药研究所北京100700 鲁东大学生命科学学院烟台264000

农田栽参是生态友好型人参栽培模式,可以保障人参产业的可持续发展。本研究对农田栽参中土壤改良和栽参技术进行了综述,探讨了物理消毒、化学消毒、施肥改土、绿肥回田的措施对参地微生态环境的改善作用,并且介绍了人参栽培的新品种,阐... 详细信息

农田栽参是生态友好型人参栽培模式,可以保障人参产业的可持续发展。本研究对农田栽参中土壤改良和栽参技术进行了综述,探讨了物理消毒、化学消毒、施肥改土、绿肥回田的措施对参地微生态环境的改善作用,并且介绍了人参栽培的新品种,阐述中国与日韩两国在人参栽培模式方面的差异及人参栽培过程中发现的主要病虫害及其防治策略。本研究对农田栽参模式的推广具有指导意义,为人参产业的健康发展提供依据。

关键词：人参农田栽参土壤改良人参新品种栽培模式

Rise of β-furanosyl ribonucleosides as the extant RNA component facilitated by simple divalent transition-metal minerals

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Qianqian Chen Haoxing xu Bingyue Zhao Yeersen Patehebieke Zerun Zhao Xiao Wang School of Chemistry and Chemical Engineering Nanjing University Frontiers Science Center for Critical Earth Material Cycling Nanjing University

The selective nucleoside synthesis through direct condensation between nucleobase and unactivated sugar in aqueous media has long been a formidable obstacle for the early chemical transformations hypothesized to construct the RNAWorld, due to product complexity and the low selectivity of the desired isomer. The preference of β-furanoside, the extant RNA component, has never been documented. Here we report an aqueous ribosylation mediated by divalent transition-metal ions, which unprecedentedly enhances the selectivity of furanosyl ribonucleosides as opposed to the traditionally predominating pyranosyl ones, with the furanoside/pyranoside ratio reaching up to 9/1. Furthermore, β-furanoside stands out for the first time as the most prevalent isomer in the presence of zinc and ammonium salts. The mechanism of this selectivity is elucidated with density functional theory calculations. The selectivity for β-furanoside can be further elevated via the adsorption on a zinc mineral. These findings exhibit as the first example that the selection of nucleosides with the desired, canonical configuration might be completed in the early stage of the RNA-forming process as opposed to later evolution, promoted by simple and widespread transition-metal minerals. The study may also find its value in synthetic chemistry as a guideline for developing a sustainable and selective glycosylation process.

关键词：

Genesis of geothermal water in the hinterland of Guanzhong Basin， China: Insight from hydrochemical and isotopic analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2025年

作者： Jiangxia Wang Panpan xu Hui Qian Yongqi Zang Qiming Wang Zhiyuan Ma School of Water and Environment， Chang'an University Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education， Chang'an University Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources， Chang'an University

The Guanzhong Basin， located in Shaanxi Province， China， has abundant geothermal resources in its hinterland. Focusing on typical thermal reservoir structural units， namely the Xianli fault-step (XL) and Xi'an depression (XA)， this study reveals the genesis of geothermal water by combining hydrochemistry and environmental isotopes. The geothermal waters of XL uniformly correspond to the Na-Cl type with high contents of major ions， while the geothermal water of XA has complex hydrochemical types. The quartz geothermometer (with maximum steam loss) and Na-K-Ca geothermometer are recommended for XL and the quartz geothermometer (with no and maximum steam loss) and Na-K geothermometer for XA. Their temperature ranges are 99-159℃ and 93-146℃， respectively. The circulation depth of geofluids in XL and XA range from 2579 to 4766 m and from 2541 to 4330 m， with mean apparent ages of 21543 and 20345 yr B.P.， respectively. The geothermal water in XL originates from a mixture of sedimentary water and ancient infiltration water， and its formation mode was the vertical heat conduction with cooling process. In contrast， the geothermal water in XA originates from the dual process of cooling and mixing， with the process being dominated by ancient infiltration water and supplementation by modern infiltration water.

关键词：

Ultrastrong room-temperature phosphorescence in cucurbit[8]uril-mediated crystalline supramolecules for ratiometric detection of phenethylamine

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Qingyu Niu Yingxiang Ye Lingna Su xu He Zhiqiang Li Yu Liu School of Chemical Engineering and Technology Hebei University of Technology Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials Science Fujian Normal University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University College of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University

It is a great challenge to modulate purely organic fluorescence-phosphorescence dual emission in aqueous solution because the excited singlet and triplet states are in competition with each other. Herein, we report a crystalline 1:2 host-guest formed by selfassembly of 4-(4-bromophenyl)-pyridinium derivatives and cucurbit[8]uril, in which a rigid environment rich in weak interactions is directly demonstrated. Due to the inhibition of non-radiative transition and stabilization of triplet exciton in the crystalline environment, the crystalline inclusion complex exhibits ultralong room-temperature phosphorescence lifetime of 3.21 ms with an room-temperature phosphorescence(RTP) quantum yield up to 16.29%. Interestingly, the crystalline 1:2 hostguest complex demonstrates the ability of rapid identification and sensitive fluorescence-phosphorescence ratiometric detection behavior toward phenethylamine, a drug analogue, with a limit of detection as low as 27.5 nM. We believe that this study will undoubtedly broaden the utilizing scopes of RTP and offer a novel avenue for psychoactive substances monitoring.

关键词：

Optimization Method for Cross-regional Maximum Power Purchase Capacity in Regional Power Grids Ensuring Supply Scenarios

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Dianwang Jishu/Power System Technology 2025年第1期49卷 232-241页

作者： xu, Hao Jia, Longwen Liu, Zhicheng xu, Jian Huang, Yanbo Liao, Siyang Central China Branch of State Grid Corporation of China Hubei Province Wuhan 430077 China School of Electrical Engineering and Automation Wuhan University Hubei Province Wuhan 430072 China

As multiple levels of electricity markets become intertwined and coupled across different time scales, regional power grids, while serving as hubs for trading channels, also face a series of operational risks, such as network congestion and ensuring security and reliability of supply. In response to the supply security scenario under market-oriented models, based on the analysis of intra-provincial transmission section blocking, an optimization method for inter-regional and inter-provincial power supply capability in the electricity spot market is proposed. Firstly, based on the correlation model of inter-provincial trading channels, inter-provincial physical interconnections, and intra-provincial transmission sections, the mechanism of intra-provincial network congestion formation is analyzed. Secondly, the Gradient Boosting Decision Tree algorithm predicts intra-provincial transmission section blocking, identifying critical sections that form the boundary for electricity purchases in the spot market. Finally, to maximize electricity purchases through inter-regional channels while considering constraints on DC power injection stability, the power supply capability of the target province is optimized. The proposed method is validated by analyzing it based on actual provincial networks. © 2025 Power System Technology Press. All rights reserved.

关键词： Power markets

Differential distribution of PINK1 and Parkin in the primate brain implies distinct roles

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1124-1134页

作者： Yanting Liu Wei Huang Jiayi Wen Xin Xiong Ting xu Qi Wang Xiusheng Chen Xianxian Zhao Shihua Li Xiaojiang Li Weili Yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong-Hongkong-Macao CNS Regeneration Institute of Jinan UniversityJinan UniversityGuangzhouGuangdong ProvinceChina

The vast majority of in vitro studies have demonstrated that PINK1 phosphorylates Parkin to work together in mitophagy to protect against neuronal ***,it remains largely unclear how PINK1 and Parkin are expressed in mammalian *** has been difficult to address because of the intrinsically low levels of PINK1 and undetectable levels of phosphorylated Parkin in small *** this issue is critical for elucidating the in vivo roles of PINK1 and ***,we showed that the PINK1 kinase is selectively expressed as a truncated form(PINK1–55)in the primate *** the present study,we used multiple antibodies,including our recently developed monoclonal anti-PINK1,to validate the selective expression of PINK1 in the primate *** found that PINK1 was stably expressed in the monkey brain at postnatal and adulthood stages,which is consistent with the findings that depleting PINK1 can cause neuronal loss in developing and adult monkey ***1 was enriched in the membrane-bound fractionations,whereas Parkin was soluble with a distinguishable *** double staining experiments showed that PINK1 and Parkin did not colocalize under physiological conditions in cultured monkey astrocytes,though they did colocalize on mitochondria when the cells were exposed to mitochondrial *** findings suggest that PINK1 and Parkin may have distinct roles beyond their well-known function in mitophagy during mitochondrial damage.

关键词： neurodegeneration Parkin Parkinson’s disease PINK1 subcellular distribution

The complex roles of m^(6)A modifications in neural stem cell proliferation, differentiation, and self-renewal and implications for memory and neurodegenerative diseases

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1582-1598页

作者： Yanxi Li Jing xue Yuejia Ma Ke Ye xue Zhao Fangliang Ge Feifei Zheng Lulu Liu xu Gao Dayong Wang Qing Xia Department of Biochemistry and Molecular Biology College of Basic Medical SciencesHarbin Medical UniversityHarbinHeilongjiang ProvinceChina College of Basic Medical Sciences Harbin Medical UniversityHarbinHeilongjiang ProvinceChina Basic Medical Institute Heilongjiang Academy of Medical SciencesHarbinHeilongjiang ProvinceChina Key Laboratory of Heilongjiang Province for Genetically Modified Animals Harbin Medical UniversityHarbinHeilongjiang ProvinceChina Translational Medicine Research and Cooperation Center of Northern China Heilongjiang Academy of Medical SciencesHarbinHeilongjiang ProvinceChina Dongzhimen Hospital Beijing University of Chinese MedicineBeijingChina

N6-methyladenosine(m^(6)A), the most prevalent and conserved RNA modification in eukaryotic cells, profoundly influences virtually all aspects of mRNA metabolism. mRNA plays crucial roles in neural stem cell genesis and neural regeneration, where it is highly concentrated and actively involved in these processes. Changes in m^(6)A modification levels and the expression levels of related enzymatic proteins can lead to neurological dysfunction and contribute to the development of neurological diseases. Furthermore, the proliferation and differentiation of neural stem cells, as well as nerve regeneration, are intimately linked to memory function and neurodegenerative diseases. This paper presents a comprehensive review of the roles of m^(6)A in neural stem cell proliferation, differentiation, and self-renewal, as well as its implications in memory and neurodegenerative diseases. m^(6)A has demonstrated divergent effects on the proliferation and differentiation of neural stem cells. These observed contradictions may arise from the time-specific nature of m^(6)A and its differential impact on neural stem cells across various stages of development. Similarly, the diverse effects of m^(6)A on distinct types of memory could be attributed to the involvement of specific brain regions in memory formation and recall. Inconsistencies in m^(6)A levels across different models of neurodegenerative disease, particularly Alzheimer's disease and Parkinson's disease, suggest that these disparities are linked to variations in the affected brain regions. Notably, the opposing changes in m^(6)A levels observed in Parkinson's disease models exposed to manganese compared to normal Parkinson's disease models further underscore the complexity of m^(6)A's role in neurodegenerative processes. The roles of m^(6)A in neural stem cell proliferation, differentiation, and self-renewal, and its implications in memory and neurodegenerative diseases, appear contradictory. These inconsistencies may be a

关键词： Alzheimer's disease cell self-renewal central nervous system memory microglia nerve regeneration neurodegenerative diseases neurogenesis RNA methylation

在线全文

学校读者我要写书评

暂无评论

煤炭地下气化典型有机物热解产出研究

煤炭工程 2023年第5期55卷 170-174页

作者：辛林吴景王博伟牛茂斐李佳泽徐伟豪王欣尚振杰李华龙马彦山东科技大学安全与环境工程学院山东青岛266590 山东科技大学矿山灾害预防控制-省部共建国家重点实验室培育基地山东青岛266590 山东鲁西发电有限公司山东济宁408300

煤炭地下气化过程中尤其是干馏干燥区,热解产生的大量有机物,会对周围含水层造成潜在的污染风险,严重制约煤炭地下气化的产业化发展。通过对煤样进行200~600℃不同终温下慢速热解,模拟气化通道干馏干燥区无氧条件下的热解反应实验,探究... 详细信息

煤炭地下气化过程中尤其是干馏干燥区,热解产生的大量有机物,会对周围含水层造成潜在的污染风险,严重制约煤炭地下气化的产业化发展。通过对煤样进行200~600℃不同终温下慢速热解,模拟气化通道干馏干燥区无氧条件下的热解反应实验,探究煤热解产生典型有机质种类及含量的变化规律。研究表明,热解温度为200℃时,热解产物中含氧化合物含量最高,高达36.19%,随着温度升高,其含量变化较小;酚类化合物随着热解温度的升高而增多,600℃时含量达到17.97%;芳香烃化合物在原煤中含量较高,温度高于300℃时开始大量释放,占热解总产物的比重较高;在300℃时热解产生了大量脂肪烃化合物,随着温度继续升高其含量不断下降,600℃时脂肪烃含量下降至总产物的10%左右。

关键词：煤炭地下气化低温热解典型有机物 GC-MS

Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng Huang Mudong Tu Hua Li Yong Peng Wei Dou Cailing xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering School of Materials and Energy Lanzhou University College of Chemistry and Chemical Engineering Luoyang Normal University

Designing highly active and stable electrocatalysts of oxygen evolution reaction （OER） is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium（Rh@NiFe-MIL-53）,is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe（OH）2after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center （εd）,accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity （240 mV） with a small Tafel slope of 48.2 mV dec-1and long-term durability (over1270 h at 10 m A cm-2and 110 h at 200 mA cm-2).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： X ray photoelectron spectroscopy