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Origin and nature of cold seep in northeastern Dongsha area,South China Sea:Evidence from chimney-like seep carbonates

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Chinese Science Bulletin 2013年第30期58卷 3689-3697页

作者： HAN XiQiu yang kehong HUANG Yongyang Key Laboratory of Submarine Geosciences State Oceanic Administration Second Institute of Oceanography State Oceanic Administration Guangzhou Marine Geological Survey

The occurrence of seep carbonates is one of the characteristic features for cold seep sites at continental *** carbonates documented the venting history of methane-rich *** to the chemoherm carbonates and carbonate pavements which formed on the sediment-water interface,chimney-like seep carbonates precipitated around fluid conduits below the sediment-water interface therefore better recording information of the past fluid flow and *** the chimney-like seep carbonate samples from the northeastern Dongsha area of the South China Sea were studied to understand the origin and nature of the venting fluids and their potential relationship with gas hydrate deposits underneath the *** on the occurrence,morphology,petrology,mineralogy and C-and O-isotope compositions,combined with present and past bottom water temperatures and the timing of methane release events,the oxygen isotopic fractionation between calcite and water were used to estimate the equilibriumδ18O values of the precipitating ***δ13C values ranging from 56.33‰to 42.70‰V-PDB and thus clearly show that the studied chimneys were mainly derived from biogenic methane *** calculated equilibriumδ18O values of the precipitating fluids ranged from 1.9‰0.3‰to 0.6‰0.3‰V-SMOW,with an average of 1.4‰0.3‰V-SMOW which is heavier than those of seawater even at the last glacial *** is considered that the formation of chimney-like carbonates was closely related to methane hydrate dissociation in the *** methane hydrates contributed as much as45.7%of water to the venting *** is suggested that the climate and environmental changes(***-level lowering,down-cutting canyons and mass wasting)are the major mechanisms maybe responsible for the destabilization of methane hydrates in the study *** extensive occurrence of seep carbonates indicates that a large amount of the methane released from methane hydrate dissociation has been effectively captured

关键词：冷泉碳酸盐岩南海东北部群岛海域中国南海烟囱东沙性质甲烷水合物

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Evolution and diagenetic implications of framboids in the methane-related carbonates of the northern Okinawa Trough

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Acta Oceanologica Sinica 2021年第12期40卷 114-124页

作者： kehong yang Zhimin Zhu Yanhui Dong Fengyou Chu Weiyan Zhang Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Authigenic carbonate samples were collected from the northern Okinawa *** on their carbon and oxygen isotopes,these samples were found to be methane-related carbonates precipitated by the anaerobic oxidation of methane(AOM).Petrological analysis revealed numerous framboidal pyrites that had been partly *** order to trace the variation and diagenetic information of these framboidal pyrites,their diameters and geochemical components were studied using an electron *** results showed that their diameters varied from 4μm to 17μm(n=60;geometric mean of 9.9μm)and were of a normal *** diameters of single pyrite that formed the framboidal pyrites varied from 1μm to 2μ*** framboidal pyrites with diameters of 6–14μm accounted for~80%of the *** geometric mean of 9.9μm indicates that they are probably diagenetic pyrites that were precipitated in a lower dysoxic environment(weakly oxygenated bottom waters).The S/Fe ratio of the framboidal minerals ranged from 0 to 1.67,and the pyrite content of single framboid varied between 0%and 86.4%.Therefore,numerous pyrites were oxygenated to iron oxides or oxyhydroxides,and were retained as pseudomorphism *** size of framboidal pyrites precipitated in cold seeps can be used to trace the redox environment;however,acquisition of additional data via investigation of different cold seeps is necessary to obtain more persuasive results.

关键词： framboidal pyrite grain size S/Fe ratio methane-related carbonate

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Petrology and geochemistry of cold seep carbonates from the northern Okinawa Trough,East China Sea:implications to early diagenesis

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Journal of Oceanology and Limnology 2022年第4期40卷 1388-1403页

作者： kehong yang Zhimin ZHU Yanhui DONG Weiyan ZHANG Fengyou CHU Key Laboratory of Submarine Geosciences&Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China

Carbonate samples were collected from the northern Okinawa Trough in the East China Sea in *** petrology,mineralogy,carbon and oxygen isotopes,and rare earth elements(REEs)of these samples were ***,high-Mg calcite,and dolomite were the main carbonate minerals,the contents of which varied greatly among the carbonate *** observations revealed the common occurrence of framboidal ***δ^(13)C values of carbonates varied from-53.7‰to-39.3‰(average of-47.3‰based on Vienna Pee Dee Belemnite(V-PDB),n=9),and theδ^(18)O values ranged from 0.6‰to 3.4‰(average of 1.9‰;V-PDB,n=9).The carbon and oxygen isotope characteristics indicated that the carbonates precipitated during the anaerobic oxidation of *** carbon source was a mixture of thermogenic methane and biogenic methane,possibly with a greater contribution from the *** oxygen isotope data showed that gas hydrate dissociation occurred during carbonate *** Ce anomalies suggested that the carbonates precipitated in an anoxic environment.A slight enrichment of middle REEs(MREEs)could be attributable to the early *** structures,minerals,oxygen isotopes,and MREEs all indicated that the carbonates experienced some degree of early ***,the infl uence of early diagenesis should be considered when using geological and geochemical proxies to reconstruct original methane seepage environments.

关键词： authigenic carbonate carbon and oxygen isotopes rare earth elements(REEs) anaerobic oxidation of methane(AOM) northern Okinawa Trough

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Linking Monsoon Activity with River-Derived Sediments Deposition in the Northern South China Sea

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Journal of Ocean University of China 2019年第5期18卷 1098-1104页

作者： GE Qian XU Dong YE Liming yang kehong YAO Zhigang Key Laboratory of Submarine Geosciences State Oceanic AdministrationHangzhou 310012China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China Key Laboratory of Physical Oceanography Ocean University of ChinaQingdao 266100China

The history of the East Asian monsoon(EAM)since Last Glacial Maximum is reconstructed based on records in a sediment core retrieved from the northern South China *** provenance of organic carbon and the EAM’s evolution are investigated using combined organic carbon,grain size,and AMS 14 C dating *** to the strong winter monsoon,the marine organic matter was dominated in the sediments,andδ13 C of organic matter was high during the last glacial *** the Holocene,the primary productivity decreased and the dilution effect of riverine inorganic clastics ***,the total organic carbon contents andδ13 C values decreased,and terrestrial organic matter content increased in the core *** 4μm grain size fraction,as the environmental sensitive grain size component,is determined to reconstruct the paleoclimatic *** the last glacial period,the contents of 4μm grain size component were mainly controlled by the sea level *** the Holocene,the influence of the sea level changes weakened and the roles of current system and provenance *** correlation between the EAM and solar insolation forcing is also discussed in this paper.

关键词： organic carbon grain size sea level current system South China Sea East Asian monsoon

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Geochemical characteristics of platinum-group elements in polymetallic nodules from the Northwest Pacific Ocean

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Acta Oceanologica Sinica 2020年第8期39卷 34-42页

作者： Zhongrong Qiu Yanhui Dong Weilin Ma Weiyan Zhang kehong yang Hongqiao Zhao Key Laboratory of Submarine Geosciences Ministry of Natural ResourcesHangzhou 310012China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China

Polymetallic nodules and cobalt (Co)-rich crusts are enriched in platinum-group elements (PGEs),especially platinum (Pt) and may be important sinks of *** present,little information is available on PGEs in polymetallic nodules,and their geochemical characteristics and the causes of PGEs enrichment are *** PGEs of polymetallic nodules from abyssal basin in the Marcus-Wake Seamount area of the Northwest Pacific Ocean are reported and compared with the published PGEs data of polymetallic nodules and Co-rich crusts in the *** total PGEs (ΣPGE) content of polymetallic nodules in study area is 258×10^–9) in average,markedly higher than that of Clarion-Clipperton Zone (CCZ) nodules (ΣPGE=127×10^–9) and lower than that of Co-rich crusts in the Marcus-Wake Seamount (ΣPGE=653×10^–9),similar to that of Co-rich crusts in the South China Sea(ΣPGE=252×10^~–9).The CI chondrite-normalized PGEs patterns in different regions of polymetallic nodules and cobalt-rich crusts are highly consistent,with all being characterized by positive Pt and negative Pd anomalies These results,together with those of previous studies,indicate that PGEs in polymetallic nodules and Co-rich crusts are mainly derived directly from *** contents of polymetallic nodules from the study area are negatively correlated with water depth,and Pt/ΣPGE ratios in nodules there are also lower than those of the Corich crusts in the adjacent area,indicating that sedimentary water depth and oxygen fugacity of ambient seawater are the possible important controlling factors for Pt accumulation in crusts and nodules.

关键词： platinum-group elements polymetallic nodules Co-rich crusts Marcus-Wake Seamount

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The spatial multiscale variability of heavy metals based on factorial kriging analysis: A case study in the northeastern Beibu Gulf

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Acta Oceanologica Sinica 2015年第12期34卷 137-146页

作者： ZHAO Jianru CHU Fengyou JIN Xianglong WU Qingsong yang kehong GE Qian JIN Lu Graduate School China University of GeosciencesWuhan Key Laboratory of Submarine Geosciences State Oceanic Administration Key Laboratory of Engineering Oceanography Second Institute of Oceanography State Oceanic Administration School of Earth Sciences Zhejiang University

Factorial kriging analysis is applied to the research on the spatial multiscale variability of heavy metals in submarine. It is used to analyze the multiscale spatial structures of seven heavy metals, Ni, Cu, Zn, Pb, Cr, As and Cd in the surface sediment from the northeastern of Beibu Gulf, identify and separate spatial variations at different scales of heavy metals, and discuss the provenance of heavy metals and the influencing factors. The results show that the existence of three-scale spatial variations those consist of nugget effect, a spherical structure with range of 30 km（short-range scale） and a spherical structure with range of 140 km（long-range scale） in the linear model of coregionalization fitted. The spatial distribution features of seven heavy metals at short-range scale reflect ＂spot-like＂ or ＂stripe-like＂ local-scale spatial variations; the spatial distribution features of the seven heavy metals at long-range scale represent ＂slice-like＂ regional-scale spatial variations. At local scale, Zn, Cr, Ni,Cu, Pb and Cd are derived primarily from parent materials of Hainan Island, Leizhou Peninsula and Guangxi land, whose spatial distribution characteristics are controlled by granularity of sediments, while As is influenced dominantly by human pollution components from Hainan Island and Leizhou Peninsula. At regional scale, Zn,Cr, Ni and Cu originate primarily from parent rock materials of Leizhou Peninsula and Hainan Island, secondly from Guangxi land; As originated primarily from parent rock materials from Hainan Island, secondly from Leizhou Peninsula and Guangxi land. These metals are transported and migrated with sediments dominated by the anticlockwise circulation of Beibu Gulf year-round, deposited in ＂convergence center＂, forming the whole sedimentary pattern in direction of NWW-NNW at regional scale. The difference in distribution type between As and other metals at regional scale is mainly due to their different geochemical behavior.

关键词： spatial multiscale variability heavy metals factorial kriging analysis sediments northeastern Beibu Gulf

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JAK/STAT信号通路在乳腺癌中的研究进展

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广西医学 2024年第1期46卷 139-144页

作者：谢珠珠杨柯鸿冯文静钱荣华湖南中医药大学医学院血管生物学与转化医学湖南省高校重点实验室湖南省长沙市410208

恶性肿瘤已成为威胁全人类生命健康的重大公共卫生问题,其中乳腺癌是全球女性发病率最高的恶性肿瘤。现阶段针对乳腺癌的常规治疗方法(如手术、放疗、化疗等)的副作用较大,患者预后仍不理想,因此迫切需要更有效的治疗手段。在乳腺癌中,J... 详细信息

恶性肿瘤已成为威胁全人类生命健康的重大公共卫生问题,其中乳腺癌是全球女性发病率最高的恶性肿瘤。现阶段针对乳腺癌的常规治疗方法(如手术、放疗、化疗等)的副作用较大,患者预后仍不理想,因此迫切需要更有效的治疗手段。在乳腺癌中,Janus激酶(JAK)/信号转导子及转录激活因子(STAT)信号通路与细胞凋亡、侵袭转移、耐药性、肿瘤免疫等方面相关。JAK/STAT信号通路的异常会促进乳腺癌的发生与发展。本文从细胞凋亡、侵袭转移、耐药性、肿瘤免疫等角度对JAK/STAT信号通路介导乳腺癌发生与发展的作用机制,以及该信号通路在乳腺癌治疗中的应用进行综述,以期为乳腺癌防治的深入研究提供参考。

关键词：乳腺癌 Janus激酶/信号转导子及转录激活因子信号通路作用机制治疗综述

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羟基积雪草酸对乳腺癌MCF-7细胞增殖、凋亡和自噬的影响

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湖南中医药大学学报 2024年第5期44卷 771-777页

作者：谢珠珠杨柯鸿冯文静邹攀钱荣康钱荣华湖南中医药大学医学院血管生物学与转化医学湖南省高校重点实验室湖南长沙410208 广西壮族自治区南溪山医院广西桂林541002 钱荣康诊所湖南娄底417700

目的探讨羟基积雪草酸(madecassic acid,MA)对乳腺癌MCF-7细胞增殖、凋亡及自噬的影响。方法将MCF-7细胞分为阴性对照组、不同浓度的MA(80、100、120、140、160μmol/L)组、不同浓度的他莫昔芬(10、20、30、40、50、35μmol/L)组,干预24... 详细信息

目的探讨羟基积雪草酸(madecassic acid,MA)对乳腺癌MCF-7细胞增殖、凋亡及自噬的影响。方法将MCF-7细胞分为阴性对照组、不同浓度的MA(80、100、120、140、160μmol/L)组、不同浓度的他莫昔芬(10、20、30、40、50、35μmol/L)组,干预24、36、48 h。初步确定MA发挥抗乳腺癌作用的最佳浓度和最佳时间后,采用MTT法检测细胞活力,计算相应的半抑制浓度(half maximal inhibitory concentration,IC50)值;流式细胞术检测细胞凋亡;JC-1荧光探针检测线粒体膜电位变化;Western blot法检测细胞增殖蛋白细胞核抗原蛋白(proliferating cell nuclear antigen,PCNA)、自噬蛋白苄氯素-1(Beclin-1)、微管相关蛋白1轻链3-Ⅱ/Ⅰ(microtubule-associated protein1 light chain 3Ⅱ/Ι,LC3Ⅱ/Ι)、螯合体1(protein 62,p62)的蛋白相对表达水平。透射电镜检测自噬小体。结果发挥抗肿瘤作用的他莫昔芬最佳浓度为35μmol/L,MA最佳浓度为140μmol/L,最佳时间均为48 h。与阴性对照组相比,MA140μmol/L组和他莫昔芬35μmol/L组的细胞凋亡率,细胞荧光相对强度以及LC3Ⅱ/Ⅰ、Beclin-1蛋白相对表达水平均升高(P<0.05,P<0.01);PCNA、P62蛋白相对表达水平降低(P<0.05,P<0.01)。与MA 140μmol/L组相比,他莫昔芬35μmol/L组细胞凋亡率、细胞荧光相对强度以及Beclin-1蛋白相对表达水平明显升高(P<0.01),PCNA蛋白相对表达水平明显降低(P<0.01)。阴性对照组MCF-7细胞膜完整,核膜清晰,细胞形态良好;MA 140μmol/L组细胞膜、细胞核形态不规则,线粒体基质密度较高、嵴扩张,可见自噬小体;他莫昔芬35μmol/L组细胞膜局部溶解、破损,可见双核仁,线粒体肿胀、基质溶解,可见自噬小体。结论MA可抑制乳腺癌MCF-7细胞的增殖、诱导细胞凋亡和自噬。

关键词：乳腺癌羟基积雪草酸增殖凋亡自噬 MCF-7细胞

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Utilizing dual-pathway energy transfer in upconversion nanoconjugates for reinforced photodynamic therapy

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Nano Research 2024年第4期17卷 2941-2948页

作者： Ruohao Zhang Yu Lu Yifei Zhou kehong Lv Xinyu Fu Jitong Gong Shuang Yao Xiaozhen Wang Jing Feng Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China College of Chemistry Jilin UniversityChangchun 130012China Department of Breast Surgery General Surgery Centerthe First Hospital of Jilin UniversityChangchun 130021China Department of Chemistry Tsinghua UniversityBeijing 100084China

Enhancing the therapeutic effect of existing treatments or developing new non-invasive treatments are important measures to achieve high-efficiency treatment of malignant *** therapy(PDT)is an emerging treatment modality,and the key for achieving high-efficiency PDT is to select light with strong tissue penetration depth and enhance the generation of reactive oxygen species(ROS).Although the upconversion nanoparticles(UCNPs)modified with the photosensitizers could achieve PDT with strong penetration depth under near-infrared light irradiation,the ROS generated by traditional single-pathway PDT is still ***,we developed a novel nanoconjugate(UCNP-Ce6/AIEgen)for dual-pathway reinforced PDT,in which the UCNPs were co-modified with chlorin e6(Ce6)and luminogen with aggregation-induced emission(AIEgen).Due to the presence of AIEgen,UCNP-Ce6/AIEgen could avoid aggregation-caused luminescence quenching in biological water environments and convert upconversion luminescence(UCL)of UCNPs to Ce6-activatable ***,under the irradiation of 808 nm laser,UCNP-Ce6/AIEgen can not only undergo direct lanthanide-triplet energy transfer to activate Ce6,but also convert the UCL of UCNPs to the light that can activate Ce6 through Fӧrster resonance energy transfer to generate more ROS,thus promoting tumor cell *** work broadens the applications of nanoconjugates of lanthanide-based inorganic materials and organic dyes,and provides a conception for reinforced PDT of tumors.

关键词： upconversion nanoparticle aggregation-induced emission direct lanthanide-triplet energy transfer Förster resonance energy transfer photodynamic therapy

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南海北部甲烷渗漏系统环境变化的碳、氧同位素记录

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地球科学（中国地质大学学报） 2016年第7期41卷 1206-1215页

作者：杨克红于晓果初凤友董彦辉国家海洋局第二海洋研究所浙江杭州310012 国家海洋局海底科学重点实验室浙江杭州310012

冷泉碳酸盐岩记录了甲烷渗漏活动和流体组分随时间的变化过程,对示踪冷泉系统沉积环境变化具有非常重要的意义.对南海北部获取的冷泉碳酸盐岩进行了碳、氧同位素剖面研究,并对南海北部冷泉碳酸盐岩的碳、氧同位素变化范围进行了统计分析... 详细信息

冷泉碳酸盐岩记录了甲烷渗漏活动和流体组分随时间的变化过程,对示踪冷泉系统沉积环境变化具有非常重要的意义.对南海北部获取的冷泉碳酸盐岩进行了碳、氧同位素剖面研究,并对南海北部冷泉碳酸盐岩的碳、氧同位素变化范围进行了统计分析.研究结果及已发表的δ13 C和δ18 O剖面数据表明,南海北部冷泉碳酸盐岩剖面的δ13 C和δ18 O之间普遍存在相关性,相关系数R2最高可达0.933 1.经统计,南海北部冷泉碳酸盐岩样品δ13 C和δ18 O均具有较大的变化范围,其最大变化分别为34.50×10-3和5.89%(Vienna Pee Dee Belemnite,V-PDB).冷泉碳酸盐岩δ13 C和δ18 O的相关性特征可能指示了初始流体的变化、后期矿物形成/重结晶作用、渗漏系统较为复杂或者成岩作用等环境变化信息.对不同碳酸盐岩样品来说,δ13 C的变化主要由海水的参与程度决定,而δ18 O的变化可能与温度和Mg元素参与方解石沉淀的程度有关.

关键词：同位素甲烷渗漏冷泉碳酸盐岩南海北部环境地质

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