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carbon-bridged atomically dispersed platinum on MOF-derived ZnO/c for selective photocatalytic oxidation of NO into Nitrates and Nitrites

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cARBON 2023年第1期214卷

作者： Hu, Lizhen Liu, Jiayou Huang, Xiaoxiang Nie, Qianqian Liu, Penglei Tan, Zhongchao Yu, Hesheng China Univ Min & Technol Sch Chem Engn & Technol Xuzhou 221116 Jiangsu Peoples R China Univ Waterloo Dept Mech & Mechatron Engn 200 Univ Ave West Waterloo ON N2L 3G1 Canada Tsinghua Univ Dept Energy & Power Engn Beijing 100084 Peoples R China Univ Waterloo Dept Mech & Mechatron Engn Waterloo ON N2L 3G1 Canada

Using nanoclusters and single atoms with unique activity to replace nanoparticles is a promising strategy to enhance catalyst activity. However, stable loading of nanoclusters and single atoms remain a challenge. This paper reports atomically dispersed Pt bridged with metal-organic framework (MOF)-derived ZnO/c through carbon atoms (Pt-ZnO/c), by impregnation combined with calcination, for photocatalytic oxidation of NO. The MOF-derived ZnO/c has a larger specific surface area than pure ZnO. The presence of c enhances the visible light absorption, promotes the migration of photogenerated carriers, and more importantly facilitates the stabilization of Pt single atoms through Pt-c interactions. The Pt species present in the Pt-ZnO/c catalysts in the form of single atoms and nanoclusters. The Pt-ZnO/c catalysts show high NO conversion rates and selectivity towards NO3 /NO2  ions formation. Specifically, the NO conversion rate of 81.9% is much higher than those of ZnO/c (31.4%) and Pt nanoparticles loaded ZnO/c (Pt NPs-ZnO/c, 58.6%). In addition, the selectivity of NO3 /NO2  (i. e., 98.6%) formation over the Pt-ZnO/c catalyst is much higher than that of NO2 (i.e., 1.4%). Furthermore, the photocatalysis tests and ESR results suggest that the Pt single atoms and nanoclusters can enhance the oxidation of NO by promoting the production of O2 & BULL;- and OH & BULL;. The DFT results also reveal that single Pt atoms promote the adsorption of O2 and H2O to form O2 & BULL;- and OH & BULL;. More importantly, OH & BULL;can promote the selective oxidation of NO to NO3  /NO2  ions. In addition, the projected density of states of single Pt atoms loaded on the ZnO/c catalysts show that the presence of c atom bridge favors the stability of single Pt atoms because of the interaction between c and Pt atoms. This work provides a new strategy for the design of single-atom-loaded metal oxide catalysts.

关键词： Photocatalytic oxidation Single Pt atoms Nanoclusters ZnO c Selective NO oxidation

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Preparation of Mo-doping LiFePO4/c by carbon reduction method

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MATERIALS AND MANUFAcTURING PROcESSES 2021年第4期36卷 419-425页

作者： Zhang, Yu Shao, Zhongcai Zhang, Yu Shenyang Ligong Univ Sch Environm & Chem Engn Shenyang Liaoning Peoples R China

A Mo-doping LiFe1-xMoxPO4/c cathode material was synthesized via carbothermal reduction route, and the effect of the content of Mo on the structure and electrochemical performance of LiFePO4/c was studied. XRD results revealed doping of Mo did not change the olivine structure of LiFePO4/c, but also formed the Li+ vacancies, which contribute to increase the diffusion rate of Li+. The experimental results further demonstrated that among the Mo-doping samples, the LiFe0.98Mo0.02PO4/c exhibited the best cycle performance and rate performance. After 100 cycles at 0.1 c, its discharge specific capacity reached 143.2 mAh center dot g(-1), which was about 10 mAh center dot g(-1) higher than that of pure phase LiFePO4/c. The capacity retention rate was 98%. When cycling at a rate of up to 5 c, the discharge specific capacity of LiFe0.98Mo0.02PO4/c can still be maintained above 90 mAh center dot g(-1), indicating that Mo doping was an effective method to improve LiFePO4/c electrochemical performance.

关键词： composite cathode LiFePO4 c Mo-doping electrochemical

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clinical relevance of donor-specific antibodies directed at HLA-c: A long road to acceptance

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HLA 2021年第1期97卷 3-14页

作者： Visentin, Jonathan couzi, Lionel Taupin, Jean-Luc CHU Bordeaux Lab Immunol & Immunogenet Hop Pellegrin Pl Amelie Raba Leon F-33076 Bordeaux France Univ Bordeaux CNRS ImmunoConcEpT Bordeaux France CHU Bordeaux Hop Pellegrin Serv Nephrol Transplantat Dialyse & Aphereses Pl Amelie Raba Leon Bordeaux France Hop St Louis Lab Immunol & Histocompatibilite 1 Ave Claude Vellefaux Paris France Univ Paris INSERM UMR976 Paris France Univ Paris Inst Rech St Louis Paris France

In solid organ transplantation (SOT), the clinical relevance of donor-specific antibodies (DSA) directed at anti-HLA-A, -B, -DR and -DQ antigens is largely recognized while it is still a matter of debate for DSA directed at HLA-c. In this review, we summarize the peculiarities of HLA-c among class I HLA antigens as well as their immunogenicity, which underlie the clinical relevance of HLA-c locus and anti-HLA-c DSA in SOT. Many factors, both intrinsic and extrinsic to the HLA-c gene and HLA-c protein, explain its lower expression in comparison with HLA-A and -B. This lower expression can explain the apparent lower immunogenicity of HLA-c leading to a lower prevalence and strength of anti-HLA-c antibodies. Nevertheless, HLA-c antigens are truly immunogenic and preformed anti-HLA-c DSA are clinically relevant. Indeed, anti-HLA-c DSA are able to bind donor cells and to activate the complement pathway both ex vivo and in vivo. In line with this, numerous clinical studies now show that preformed DSA directed at native HLA-c molecules induce poorer graft outcomes. We then plead for the inclusion of HLA-c in all transplant allocation systems and we propose a strategy to cope with anti-HLA-c DSA in SOT. Beyond SOT, anti-HLA-c antibodies generate a growing interest in the allo-HcT, transfusion and obstetrics fields, while new concepts such as the role of the "missing-self" in solid organ rejection places HLA-c as an inescapable actor in transplant tolerance.

关键词： antibody‐ mediated rejection anti‐ HLA antibodies donor‐ specific antibodies HLA HLA‐ c pregnancy transfusion transplantation

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中间层厚度对cr3c2-Nicr / DLc复合涂层腐蚀磨损行为的影响

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中国表面工程 2024年

作者：何东青梁瑞瑞冯子涵尚伦霖兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室中国科学院兰州化学物理研究所固体润滑国家重点实验室

HVOF / PVD复合设计可提高DLc薄膜的耐腐蚀磨损性能，但中间层厚度对其腐蚀磨损行为的影响尚未明确。通过探究不同中间层厚度cr3c2-Nicr / DLc复合涂层在3.5wt.% Nacl溶液中的腐蚀行为以及在开路电位、动电位极化和阴极保护条件下的腐... 详细信息

HVOF / PVD复合设计可提高DLc薄膜的耐腐蚀磨损性能，但中间层厚度对其腐蚀磨损行为的影响尚未明确。通过探究不同中间层厚度cr3c2-Nicr / DLc复合涂层在3.5wt.% Nacl溶液中的腐蚀行为以及在开路电位、动电位极化和阴极保护条件下的腐蚀磨损行为，分析腐蚀与磨损的协同关系，从而揭示其腐蚀磨损机理。结果表明，中间层厚度的变化对复合涂层的电化学性能影响甚微。在腐蚀磨损过程中，随着中间层厚度的增加，腐蚀与磨损的交互作用造成的材料损失逐渐降低，尤其当中间层为100 μm时，摩擦对腐蚀的促进作用最小（1.738%），此时复合涂层表现出最佳的耐腐蚀磨损性能。在复合涂层的整体腐蚀磨损评估中，纯腐蚀以及摩擦促进腐蚀导致的材料损耗占比均较小，这表明在腐蚀磨损过程中，磨损是导致材料损耗的主要原因。这一研究有望推动金属陶瓷涂层与碳基薄膜在海洋环境中的复合应用，并为发展高性能海洋耐磨蚀HVOF / PVD复合防护体系提供新思路和新途径。

关键词： cr c -Nicr/DLc复合涂层腐蚀磨损中间层厚度交互作用

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consistent c-bar radial-basis Galerkin method for finite strain analysis

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ADVANcES IN ENGINEERING SOFTWARE 2023年 186卷

作者： Areias, P. Pouca, M. c. P. Vila Parente, M. P. L. Jorge, R. M. Natal Inst Super Tecn Ave Rovisco Pais1 P-1049001 Lisbon Portugal IDMEC Inst Engn Mecan Lisbon Portugal Univ Porto Fac Engn Rua Dr Roberto FriasS N P-4200465 Porto Portugal

For finite-strain problems of quasi-incompressible materials, with hyperelastic and hyperelasto-plastic behavior, we develop a mixed polynomial-enriched radial-basis function (RBF) interpolation. It is characterized by decoupling quadrature and polynomials for the deviatoric and volumetric terms of the right cauchy-Green tensor. With an enriched interpolation, first and second derivatives of the deformation gradient are continuous. A finite-element mesh is employed for quadrature purposes with the corresponding distribution of Gauss points. In terms of discretization, linear, quadratic and cubic polynomials are combined and function support is established from the number of pre-assigned nodes. Due to the adoption of a Lagrangian kernel, finite strain elasto-plastic constitutive developments are based on the Mandel stress. combined with the c technique, these developments are found to be convenient from an implementation perspective, as RBF formulations for finite strain plasticity have been limited in terms of generality and amplitude of deformations in the quasi -incompressibility case. Three benchmark tests are successfully solved, and it was found that a combination of reduced integration with a deviatoric cubic basis and volumetric quadratic basis provides superior results in the quasi-incompressible case. Numerical testing shows very good convergence behavior of the results. Besides absence of locking with selective interpolation, outstanding Newton convergence was observed regardless of strain levels.

关键词： Enriched radial-basis functions Galerkin method Quasi-incompressibility Selective quadrature Selective interpolation Meshless Finite strain plasticity c

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correlation between serum factor VIII:c levels and deep vein thrombosis following gynecological surgery

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BIOENGINEERED 2021年第2期12卷 9668-9677页

作者： Liu, Jiayi Sang, cuiqin Zhang, Zhenyu Jiang, Ying Wang, Shuzhen Li, Yao Shi, Xiao Capital Med Univ Beijing Chao Yang Hosp Dept Obstet & Gynecol Beijing 100020 Peoples R China Capital Med Univ Beijing Daxing Hosp Dept Obstet & Gynecol Beijing Peoples R China

Deep vein thrombosis (DVT) is common in patients following gynecological surgery. coagulation factor VIII (FVIII) is an important part of the human coagulation system, and FVIII:c is a component of FVIII with anticoagulant activity. 800 patients who underwent gynecological surgery were enrolled. General clinical data were harvested, and pre - and postoperative serum FVIII levels were determined. Lower-extremity ultrasound examination and/or postoperative pulmonary angiography were performed. Related data were analyzed statistically. DVT was the first manifestation of venous thromboembolism in all cases. There were a total of 46 cases, and the incidence of DVT was 5.8%. Progression to pulmonary embolism was confirmed in 16 cases, with an incidence of 2.0%. The independent risk factors for DVT after gynecological surgery were postoperative FVIII:c levels (odds ratio [OR] = 1.01), age (OR = 6.57), and operation time >= 3 hours (OR = 2.90) (P < 0.05). When the FVIII:c level was greater than the 75th centile (>= 150 IU/dL), the risk of DVT was 2.99 times higher than that below the 25th centile (<100 IU/dL) (P < 0.05). When combined with the risk factor of operation time >= 3 hours, the risk increased to 3.17 times (P = 0.10). When combined with age >= 60 years, the risk was significantly increased, reaching 12.0 times (P < 0.05). Serum FVIII:c levels are an independent risk factor for DVT after gynecological surgery. Higher levels increase the risk of DVT after gynecological surgery, and they may have a dose-dependent relationship. A synergistic effect exists in combination with other risk factors, which further increases the risk.

关键词： Deep vein thrombosis coagulation factor viii coagulation factor viii c

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c, O, and Sr Isotope Geochemistry of the Vendian Shuram-Wonoka Anomaly and Associated Metasedimentary Rocks in the Inner Part of the Patom Upland (central Siberia)

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LITHOLOGY AND MINERAL RESOURcES 2021年第5期56卷 390-417页

作者： Pokrovsky, B. G. Bujakaite, M., I Kolesnikova, A. A. Petrov, O. L. Khlebnikov, M. S. Russian Acad Sci Geol Inst Moscow 119017 Russia

The Imnyakh Formation (1500-1800 m thick), which is developed east of the Mama-Bodaibo Synclinorium (inner zone of the Patom Upland), comprises crystalline limestones (marbles) and carbonate shales (metamorphic marls). The carbon and strontium isotope compositions (delta c-13(av) = -9.0 +/- 0.4 parts per thousand, Sr-87 /Sr-86 = 0.70810-0.70845) in these rocks are completely identical to those in unmetamorphosed limestones of the Zhuya Group (outer zone) and the Torgo Formation (adjacent part of the Siberian Platform), which are comparable with the global Ediacaran c isotope anomaly (Shuram-Wonoka event). Metamorphism was not accompanied by the removal of Sr whose content in marbles of the Imnyakh Formation are as high (up to 6290 mu g/g) as in limestones of the Zhuya Group in the deepest parts of the Patom paleobasin. Thus, metamorphism was only manifested in the depletion of rocks with the heavy oxygen isotope by 3-4 parts per thousand (delta O-18(av) = 17.2 +/- 1 parts per thousand), relative to unmetamorphosed limestones. carbonates of the pre-Imnyakh black carbonate-bearing shales and deep black crystalline limestones in the Khomolkha and Ugakhan formations are characterized by wide variations of delta c-13 (-4.0 to 7 parts per thousand) and delta O-18 (15.2 to 23.4 parts per thousand), indicating strong postsedimentary alterations. Nevertheless, their Early Vendian (Early Ediacaran) age is confirmed by such features as position in the section, abnormally high delta c-13 values, and the minimum value Sr-87 /Sr-86 = 0.70753 recorded in a sample with the Sr content of 11700 mu g/g. Although the isotope systems of carbonates in the Sogdiondon and Vitim formations (delta c-13 -14.2 to -3.7 parts per thousand, delta O-18 12.2 to 13.4 parts per thousand, and 8(87)Sr/Sr-86 0.71120 to 0.71337) occurring at the Neoproterozoic sequence base in the Zhuya River underwent even stronger modification, it is possible that delta c-13 values in these formations were initially ne

关键词： c O and Sr isotope geochemistry chemostratigraphy Vendian Ediacaran Shuram-Wonoka event central Siberia

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cERATOcYSTIS MANGINEcANS AND NOT c. FIMBRIATA A THREAT TO PROPAGATED AcAcIA SPP. IN SABAH, MALAYSIA

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JOURNAL OF TROPIcAL FOREST ScIENcE 2023年 35卷 16-26页

作者： Barnes, I Rauf, M. R. Abdul Fourie, A. Japarudin, Y. Wingfield, M. J. Univ Pretoria Forestry & Agr Inst FABI Dept Biochem Genet & Microbiol ZA-0002 Pretoria South Africa Dept Res & Dev Sabah Softwoods Berhad Tawau Sabah Malaysia

Acacia mangium plantations in Sabah, Malaysia are seriously affected by a vascular wilt and canker disease caused by a species of ceratocystis. A similar and devastating disease occurs in Indonesia and is caused by the fungal pathogen ceratocystis manginecans. A closely related fungus, ceratocystis fimbriata sensu stricto, is a common soil-borne pathogen of sweet potato (Ipomoea batatas) in areas of Malaysia where A. mangium is grown. This study characterised the species causing wilting on A. mangium and compared it with the I. batatas pathogen using DNA sequence-based comparisons used artificial inoculations to assess the effect of the A. mangium pathogen on Acacia auriculiformis and Acacia crassicarpa and considered the ability of the sweet potato pathogen to cause disease on the three Acacia species. DNA sequence comparisons confirmed that isolates from diseased A. mangium were c. manginecans and those on sweet potato were c. fimbriata s.s. ceratocystis manginecans was pathogenic on all Acacia spp., with A. mangium being most susceptible followed by =A. auriculiformis and A. crassicarpa. Pathogenicity tests showed that c. fimbriata s.s. from sweet potato is not able to cause disease on any of the three Acacia spp. considered. This study also confirmed that c. manginecans is the primary cause of ceratocystis canker and wilt disease in Sabah and that the sweet potato fungus, c. fimbriata s.s., poses no threat to propagated Acacia spp.

关键词： Acacia mangium canker disease ceratocystidaceae c manginecans fungal disease wilt disease

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c/N ratios inform sustainable aerobic denitrification for nitrogen pollution control: Insights into the key parameter from a view of metabolic division

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JOURNAL OF cLEANER PRODUcTION 2023年第1期414卷

作者： Zhang, Meng Lu, Huifeng cai, Lei Sun, Pan Ma, Bin Li, Junchi chen, Guangsuo Ruan, Yunjie Zhejiang Univ Inst Agr Bioenvironm Engn Coll Biosyst Engn & Food Sci Hangzhou 310058 Peoples R China Zhejiang Univ Coll Environm & Resource Sci Dept Environm Engn Hangzhou 310058 Peoples R China Zhejiang Univ Rural Dev Acad Hangzhou 310058 Peoples R China Zhejiang Prov Key Lab Water Pollut Control & Envir Hangzhou Peoples R China Zhejiang Gongshang Univ Coll Food Sci & Biotechnol Lab Microbial Resources Hangzhou 310035 Peoples R China Zhejiang Univ Inst Soil & Water Resources & Environm Sci Coll Environm & Resource Sci Hangzhou 310058 Peoples R China

Aerobic denitrification is a feasible and sustainable process for nitrogen removal in environmental protection. The c/N ratio was the vital one that has a significant impact on the performance. However, comprehension of the c/N ratio effect on this bioprocess was not well clarified. In this study, the response of an aerobic denitrifier (Pseudomonas balearica strain RAD-17) to the c/N ratio was investigated from a view of metabolism. It was found that a high total nitrogen (TN) removal efficiency of about 95% was achieved with the dosing c/N ratio of 7.5, while only a slight increase when the dosing c/N ratios were further increased to a high range of 10-30. The carbon validity was out of sync with TN removal and a balance between the two was realizable at a dosing c/N ratio of 7.5 based on the economic consideration. Moreover, weakened assimilation while enhanced respiration along with the increased c/N ratios was revealed, evidenced by the decreased net intracellular nitrogen and increased nitrogenous gas proportions in nitrogen balance analysis. The growth characteristics in terms of cell number and OD600 showed a division for the high flux of nitrate and organics directed to assimilation and respiration, respectively. The expression levels of carbon and nitrate metabolism-related function genes in P. balearica supported the results above. The c/N ratio of 5.0-7.5 was supposed to be the turning region for the metabolism division between assimilation and respiration in aerobic denitrifying. The results are expected to offer a guideline for the decision made for organics supply for the aerobic denitrification process and support its sustainable application.

关键词： Aerobic denitrification c N ratio Nitrogen balance Growth characteristics Functional genes Metabolic division

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RPO-14c技术及其在有机地球化学研究上的应用

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海洋地质与第四纪地质 2024年

作者：马海悦包锐中国海洋大学海洋化学理论与工程技术教育部重点实验室

基于沉积物样品的热稳定性进行分析和表征是稳定有机碳性质研究的常用方法，反映和重建了有机碳在环境中的演化和循环过程。热裂解/氧化(Ramped Pyrolysis/Oxidation，RPO)-14c分析技术及其应用是目前有机地球化学研究的前沿领域，也是... 详细信息

基于沉积物样品的热稳定性进行分析和表征是稳定有机碳性质研究的常用方法，反映和重建了有机碳在环境中的演化和循环过程。热裂解/氧化(Ramped Pyrolysis/Oxidation，RPO)-14c分析技术及其应用是目前有机地球化学研究的前沿领域，也是研究沉积物有机碳埋藏与保存过程的有效方法。本文初步介绍了RPO-14c分析的测试方法和基本原理，阐述了热裂解/氧化及14c分析的装置细节，指出了包括装置改造、温度控制等在内的技术改进及与不同方法的联用拓展。RPO-14c分析技术在有机地球化学领域的沉积物研究方面得到了较广泛的应用：①揭示有机碳迁移、改造和保存机制；②改进沉积物年代学；③示踪沉积物记录的环境污染。RPO-14c能够对不同热稳定性有机碳进行高效分离，因此沉积物有机碳在自然环境中产生、迁移、改造、埋藏的过程能够借助热解特征得以重建，进而反演和评估全球范围内的有机碳循环机制和碳汇格局。最后，总结了该技术在海洋有机碳表征方面的应用前景及未来发展方向，对未来在更广泛的研究区域开展相关研究具有启示意义。

关键词：热裂解/氧化沉积物有机碳 c 碳循环

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