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Potential transformation of organic matter by microbes in cryoconite,Tibetan Plateau

Science China Earth Sciences 2024年第6期67卷 1978-1989页

作者： Bixi GUO Yongqin LIU Kevin xu zHONG Quan SHI Chen HE Qiang zHENG Ruanhong CAI State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for the Pan-Third Pole Environment Lanzhou UniversityLanzhou 730000China Department of Earth Oceanand Atmospheric SciencesUniversity of British ColumbiaVancouverBC V6T 1Z4Canada State Key Laboratory of Heavy Oil Processing Petroleum Molecules Engineering Center(PMEC)China University of PetroleumBeijing 102249China State Key Laboratory for Marine Environmental Science Collage of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Key Laboratory of Marine Carbon Sequestration Xiamen UniversityXiamen 361005China

Microorganisms play an essential role in the glacier carbon cycle;how they transform organic matter in mountain glacial cryoconite remains to be ***,we applied ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)and deep sequencing of 16S rRNA gene,to investigate the temporal microbial transformation of dissolved organic matter(DOM)of the Tibetan Plateau *** the 60-day incubation,we found that DOM in cryoconite underwent a three-stage transformation,with decreasing bioavailability over *** microbial community did not change much in the first week while degrading DOM molecules that were associated with higher H/C_(wa)and lower O/C_(wa).During days 15-30,DOM composition remained stable while microbial diversity *** day 60,the DOM was microbially converted into a higher state of recalcitrance,with higher values of aromatic index,O/C_(wa),and lower H/C_(wa),which contained molecules containing more *** among various microbial taxa,like Cyanobacteria,Bacteroidota,Gammaproteobacteria,Firmicutes,and Actinobacteriota,drove the DOM transformation in *** study sheds light on the in-situ transformation of DOM composition meditated by microbial populations in cryoconite at a temporal scale,providing new insights into understanding the microbial roles in the glacier organic carbon transformation.

关键词： Cryoconite Dissolved organic matter Biodegradation Microbial community Temporal variation

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Drilling-based measuring method for the c-φ parameter of rock and its field application

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International Journal of Mining Science and Technology 2024年第1期34卷 65-76页

作者： Bei Jiang Fenglin Ma Qi Wang Hongke Gao Dahu zhai Yusong Deng Chuanjie xu Liangdi Yao State Key Laboratory for Tunnel Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China

The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ. In this paper, a new rock cutting analysis model that considers the influence of the rock crushing zone(RCz) is built. The formula for an ultimate cutting force is established based on the limit equilibrium principle. The relationship between digital drilling parameters(DDP) and the c-φ parameter(DDP-cφ formula, where c refers to the cohesion and φ refers to the internal friction angle) is derived, and the response of drilling parameters and cutting ratio to the strength parameters is analyzed. The drillingbased measuring method for the c-φ parameter of rock is constructed. The laboratory verification test is then completed, and the difference in results between the drilling test and the compression test is less than 6%. On this basis, in-situ rock drilling tests in a traffic tunnel and a coal mine roadway are carried out, and the strength parameters of the surrounding rock are effectively tested. The average difference ratio of the results is less than 11%, which verifies the effectiveness of the proposed method for obtaining the strength parameters based on digital drilling. This study provides methodological support for field testing of rock strength parameters.

关键词： Digital drilling Rock crushing zone c-u parameter Measurement method Field application

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Multifunctional Film Assembled from N‑Doped Carbon Nanofiber with Co–N_(4)–O Single Atoms for Highly Efficient Electromagnetic Energy Attenuation

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Nano-Micro Letters 2024年第11期16卷 359-376页

作者： Jia xu Bei Li zheng Ma Xiao zhang Chunling zhu Feng Yan Piaoping Yang Yujin Chen College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001People’s Republic of China Key Laboratory of In‑Fiber Integrated Optics College of Physics and Optoelectronic EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China

Single-atom materials have demonstrated attractive physicochemical ***,understanding the relationships between the coordination environment of single atoms and their properties at the atomic level remains a considerable ***,a facile waterassisted carbonization approach is developed to fabricate well-defined asymmetrically coordinated Co–N_(4)–O sites on biomass-derived carbon nanofiber(Co–N_(4)–O/NCF)for electromagnetic wave(EMW)*** such nanofiber,one atomically dispersed Co site is coordinated with four N atoms in the graphene basal plane and one oxygen atom in the axial ***-depth experimental and theoretical studies reveal that the axial Co–O coordination breaks the charge distribution symmetry in the planar porphyrin-like Co–N_(4) structure,leading to significantly enhanced dielectric polarization loss relevant to the planar Co–N_(4) ***,the film based on Co–N_(4)–O/NCF exhibits light weight,flexibility,excellent mechanical properties,great thermal insulating feature,and excellent EMW absorption with a reflection loss of−45.82 dB along with an effective absorption bandwidth of 4.8 *** findings of this work offer insight into the relationships between the single-atom coordination environment and the dielectric performance,and the proposed strategy can be extended toward the engineering of asymmetrically coordinated single atoms for various applications.

关键词： Co single atoms Asymmetric coordination structure Axial oxygen coordination Electromagnetic wave absorption Multifunctional film

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Efficient Spin-Flip between Charge-Transfer States for High-Performance Electroluminescence, without an Intermediate Locally Excited State

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Research 2024年第1期2023卷 339-349页

作者： Donghai zhang Shanshan Jiang Xiaodong Tao Fulin Lin Lingyi Meng xu-Lin Chen Can-zhong Lu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China FuzhouFujian 350108China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamenFujian 361021China University of Chinese Academy of Sciences Beijing 100049China

Thermally activated delayed fluorescence(TADF)materials with both high photoluminescence quantum yield(PLQY)and fast reverse intersystem crossing(RISC)are strongly desired to realize efficient and stable organic light-emitting diodes(OLEDs).Control of excited-state dynamics via molecular design plays a central role in optimizing the PLQY and RISC rate of TADF materials but remains ***,3 TADF emitters possessing similar molecular structures,similar high PLQYs(89.5%to 96.3%),and approximate energy levels of the lowest excited singlet states(S_(1)),but significantly different spin-flipping RISC rates(0.03×10^(6) s^(−1) vs.2.26×10^(6) s^(−1))and exciton lifetime(297.1 to 332.8μs vs.6.0μs)were systematically synthesized to deeply investigate the feasibility of spin-flip between charge-transfer excited states(^(3)CT–^(1)CT)transition.

关键词： transition lifetime desired

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zinc finger protein 831 promotes apoptosis and enhances chemosensitivity in breast cancer by acting as a novel transcriptional repressor targeting the STAT3/Bcl2 signaling pathway

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Genes & Diseases 2024年第1期11卷 430-448页

作者： Jun Fan zhe zhang Hongqiang Chen Dongjiao Chen Wenbo Yuan Jingzhi Li Yong zeng Shimeng zhou Shu zhang Gang zhang Jiashen Xiong Lu zhou Jing xu Wenbin Liu Yan xu Department of Breast and Thyroid Surgery Daping HospitalArmy Medical University(Third Military Medical University)Chongqing 400042China Institute of Toxicology College of Preventive MedicineArmy Medical University(Third Military Medical University)Chongqing 400038China Department of Environmental Health College of Preventive MedicineArmy Medical University(Third Military Medical University)Chongqing 400038China Anesthesia and Intensive Care Chinese University of Hong KongHong Kong SAR 999077China School of Public Health Xinxiang Medical UniversityXinxiangHenan 453003China School of Public Health China Medical UniversityShenyangLiaoning 110122China

Emerging evidence suggested that zinc finger protein 831(zNF831)was associated with immune activity and stem cell regulation in breast ***,the roles and molec-ular mechanisms of zNF831 in oncogenesis remain ***831 expression was significantly diminished in breast cancer which was associated with promoter CpG methylation but not *** over-expression of zNF831 suppressed breast cancer cell proliferation and col-ony formation and promoted apoptosis in vitro,while knockdown of zNF831 resulted in an opposite ***-proliferation effect of zNF831 was verified in *** analysis of public databases and transcriptome sequencing both showed that zNF831 could enhance apoptosis through transcriptional regulation of the JAK/STAT *** and luciferase report assays demonstrated that zNF831 could directly bind to one specific region of STAT3 promoter and induce the transcriptional inhibition of *** a result,the attenuation of STAT3 led to a restraint of the transcription of Bcl2 and thus accelerated the apoptotic *** of STAT3 diminished the apoptosis-promoting effect of zNF831 in breast cancer cell ***,zNF831 could ameliorate the anti-proliferation effect of capecitabine and gemcitabine in breast cancer cell *** findings demonstrate for the first time that zNF831 is a novel transcriptional suppressor through inhibiting the expression of STAT3/Bcl2 and promoting the apoptosis process in breast cancer,suggesting zNF831 as a novel biomarker and potential therapeutic target for breast cancer patients.

关键词： Apoptosis Breast cancer Chemosensitivity STAT3 zNF831

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岩石圈内榴辉岩的命运

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中国科学：地球科学 2024年第3期54卷 897-901页

作者：王振胜徐义贤中国地质大学地质过程与矿产资源国家重点实验室武汉430074 浙江省地学大数据和地球深部资源重点实验室浙江大学地球科学学院杭州310058

1榴辉岩及其黏性排出的概念榴辉岩是由洋壳或陆壳岩石在俯冲、碰撞等构造埋深作用下,增压到1~1.5GPa以上,发生超高压变质作用(ultra-high pressure metamorphism)而生成的以石榴子石和绿辉石为主要矿物组成的特殊岩石类型.深源捕虏体研... 详细信息

1榴辉岩及其黏性排出的概念榴辉岩是由洋壳或陆壳岩石在俯冲、碰撞等构造埋深作用下,增压到1~1.5GPa以上,发生超高压变质作用(ultra-high pressure metamorphism)而生成的以石榴子石和绿辉石为主要矿物组成的特殊岩石类型.深源捕虏体研究表明克拉通岩石圈地幔中也存在一定量的榴辉岩,可能与早期俯冲或地幔柱活动有关(Aulbach和Smart, 2023).

关键词：超高压变质作用石榴子石绿辉石深源捕虏体榴辉岩岩石类型克拉通岩石圈地幔柱活动

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Anti-lymphangiogenesis for boosting drug accumulation in tumors

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2161-2175页

作者： Chunling Wang Junchao xu Xiaoyu Cheng Ge Sun Fenfen Li Guangjun Nie Yinlong zhang CAS Key Laboratory for Biomedical Effects of Nanomaterials&Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Sino-Danish College University of Chinese Academy of SciencesBeijing 100190China Sino-Danish Center for Education and Research Beijing 100190China Department of Bioengineering University of PennsylvaniaPhiladelphiaPA 19104USA School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China

The inadequate tumor accumulation of anti-cancer agents is a major shortcoming of current therapeutic drugs and remains an even more significant concern in the clinical prospects for *** strategies aiming at regulating the intratumoral permeability of therapeutic drugs have been explored in preclinical studies,with a primary focus on vascular regulation and stromal ***,these methods may trigger or facilitate tumor metastasis as a ***,there is an urgent need for innovative strategies that boost intratumoral drug accumulation without compromising treatment *** another important factor affecting drug tumor accumulation besides vasculature and stroma,the impact of tumor-associated lymphatic vessels(LVs)has not been widely *** the current research,we verified that anlotinib,a tyrosine kinase inhibitor with anti-lymphangiogenesis activity,and SAR131675,a selective VEGFR-3 inhibitor,effectively decreased the density of tumor lymphatic vessels in mouse cancer models,further enhancing drug accumulation in tumor *** combining anlotinib with therapeutic drugs,including doxorubicin(Dox),liposomal doxorubicin(Lip-Dox),and anti-PD-L1 antibody,we observed improved anti-tumor efficacy in comparison with monotherapy ***,this strategy significantly reduced tumor metastasis and elicited stronger anti-tumor immune *** work describes a new,clinically transferrable approach to augmenting intratumoral drug accumulation,which shows great potential to address the current,unsatisfactory efficacies of therapeutic drugs without introducing metastatic risk.

关键词： drugs angiogenesis metastasis

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Advances in ice avalanches on the Tibetan Plateau

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Journal of Mountain Science 2024年第6期21卷 1814-1829页

作者： TANG Minggao LI Guang zHAO Huanle xu Qiang WU Guangjian YANG Wei GUO Daojing State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China

As some of the greatest natural disasters in the cryosphere,ice avalanches(IAs)seriously threaten lives and cause catastrophic damage to the resource environment,but a comprehensive overview of the state of knowledge on IAs remains *** summarized 63 IAs on the Tibetan Plateau(TP)since the 20th century,of which,over 20 IAs occurred after the 21st *** distributions of IAs are mainly concentrated in the southeastern and northwestern TP,and the occurrence time of IAs is mostly concentrated from July to *** highlight recent advances in mechanical properties and genetic mechanisms of IAs and emphasize that temperature,rainfall,and seismicity are the inducing *** failure modes of IAs are summarized into 6 categories by examples:slip pulling type,slip toppling type,slip breaking type,water level collapse type,cave roof collapse type,and wedge failure ***,we deliver recommendations concerning the risk assessment and prediction of *** results provide important scientific value for addressing climate change and resisting glacier-related hazards.

关键词： Ice avalanche Global warming Genetic mechanism Risk assessment Tibetan Plateau

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A process-oriented approach for identifying potential landslides considering time-dependent behaviors beyond geomorphological features

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 961-978页

作者： Xiang Sun Guoqing Chen Xing Yang zhengxuan xu Jingxi Yang zhiheng Lin Yunpeng Liu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China China Railway Eryuan Engineering Group Co.Ltd. Chengdu610031China Power China Chengdu Engineering Co.Ltd. Chengdu610072China

Geomorphological features are commonly used to identify potential ***,overemphasis on these features could lead to *** research proposes a process-oriented approach for potential landslide identification that considers time-dependent *** method integrates comprehensive remote sensing and geological analysis to qualitatively assess slope stability,and employs numerical analysis to quantitatively calculate aging ***,a time-dependent stability calculation method for anticlinal slopes is developed and implemented in discrete element software,incorporating time-dependent mechanical and strength reduction *** considering the time-dependent evolution of slopes,this method highlights the importance of both geomorphological features and time-dependent behaviors in landslide *** method has been applied to the Jiarishan slope(JRS)on the Qinghai-Tibet Plateau as a case *** results show that the JRS,despite having landslide geomorphology,is a stable slope,highlighting the risk of misjudgment when relying solely on geomorphological *** work provides insights into the geomorphological characterization and evolution history of the JRS and offers valuable guidance for studying slopes with similar landslide ***,the process-oriented method incorporating timedependent evolution provides a means to evaluate potential landslides,reducing misjudgment due to excessive reliance on geomorphological features.

关键词： Geomorphological features Evolution history Time-dependent stability calculation Landslides identification Qinghai-Tibet Plateau

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Responses of plant diversity and soil microorganism diversity to nitrogen addition in the desert steppe,China

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Journal of Arid Land 2024年第3期16卷 447-459页

作者： YE He HONG Mei xu xuehui LIANG zhiwei JIANG Na TU Nare WU zhendan College of Grassland Resources and EnvironmentInner Mongolia Agricultural UniversityInner Mongolia Key Laboratory of Soil Quality and Nutrient ResourcesHohhot 010018China Key Laboratory of Agricultural Ecological Security and Green Development at University of Inner Mongolia Hohhot 010018China

Nitrogen(N)deposition is a significant aspect of global change and poses a threat to terrestrial *** impact of plant-soil microbe relationships to N deposition has recently attracted considerable *** microorganisms have been proven to provide nutrients for specific plant growth,especially in nutrient-poor desert steppe ***,the effects of N deposition on plant-soil microbial community interactions in such ecosystems remain poorly *** investigate these effects,we conducted a 6-year N-addition field experiment in a Stipa breviflora *** steppe in Inner Mongolia Autonomous Region,*** N treatment levels(N0,N30,N50,and N100,corresponding to 0,30,50,and 100 kg N/(hm2•a),respectively)were applied to simulate atmospheric N *** results showed that N deposition did not significantly affect the aboveground biomass of desert steppe plants.N deposition did not significantly reduce the alfa-diversity of plant and microbial communities in the desert steppe,and low and mediate N additions(N30 and N50)had a promoting effect on *** variation pattern of plant Shannon index was consistent with that of the soil bacterial Chao1 index.N deposition significantly affected the beta-diversity of plants and soil bacteria,but did not significantly affect fungal *** conclusion,N deposition led to co-evolution between desert steppe plants and soil bacterial communities,while fungal communities exhibited strong stability and did not undergo significant *** findings help clarify atmospheric N deposition effects on the ecological health and function of the desert steppe.

关键词： soil microorganisms plant-microbial community interaction plant diversity nitrogen deposition desert steppe

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