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switching O-O bond formation mechanism between WNA and I2M pathways by modifying the Ru-bda backbone ligands of water-oxidation catalysts

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Journal of Energy Chemistry 2021年第3期30卷 815-821页

作者： Biaobiao Zhang shaoqi Zhan Tianqi Liu Linqin Wang A.Ken Inge Lele Duan Brian J.J.Timmer Oleksandr Kravchenko Fei Li marten s.g.ahlquist Licheng sun Department of Chemistry KTH Royal Institute of Technology10044 StockholmSweden Department of Theoretical Chemistry&Biology School of Engineering Sciences in Chemistry Biotechnology and HealthKTH Royal Institute of Technology10691 StockholmSweden Department of Materials and Environmental Chemistry Stockholm University10691 StockholmSweden Department of Chemistry Southern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina state Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT–KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology(DUT)Dalian 116024LiaoningChina

Understanding the seven coordination and O-O coupling pathway of the distinguished Ru-bda catalysts is essential for the development of next generation efficient water-oxidation catalysts based on earthabundant *** work reports the synthesis,characterization and catalytic properties of a monomeric ruthenium catalyst Ru-bnda(H2 bnda=2,2’-bi(nicotinic acid)-6,6’-dicarboxylic acid)featuring steric hindrance and enhanced hydrophilicity on the *** experimental evidence with systematic density functional theory calculations on the Ru-bnda and related catalysts Ru-bda(H_(2)bda=2,2’-bipyridine-6,6’-dicarboxylic acid),Ru-pda(H_(2)pda=1,10-phenanthroline-2,9-dicarboxylic acid),and Ru-biqa(H_(2)biqa=(1,1’-biisoquinoline)-3,3’-dicarboxylic acid),we emphasized that seven coordination clearly determines presence of Ru^(Ⅴ)=O with high spin density on the ORu^(Ⅴ)=O atom,*** with radical properties,which is one of the necessary conditions for reacting through the O-O coupling ***,an additional factor to make the condition sufficient is the favorable intermolecular faceto-face interaction for the generation of the pre-reactive[Ru^(Ⅴ)=O…O=Ru^(Ⅴ)],which may be significantly influenced by the secondary coordination *** work provides a new understanding of the structure-activity relationship of water-oxidation catalysts and their potential to adopt I2M pathway for O-O bond formation.

关键词： Water oxidation Oxygen evolution Ruthenium O-O bond formation

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Isolation and Identification of Pseudo seven-Coordinate Ru(Ⅲ)Intermediate Completing the Catalytic Cycle of Ru-bda Type of Water Oxidation Catalysts

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CCs Chemistry 2022年第7期4卷 2481-2490页

作者： Tianqi Liu ge Li Nannan shen Linqin Wang Brian J.J.Timmer shengyang Zhou Biaobiao Zhang Alexander Kravchenko Bo Xu marten s.g.ahlquist Licheng sun Department of Chemistry School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10044 Department of Theoretical Chemistry and Biology School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10691 state Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123 Center of Artificial Photosynthesis for solar Fuels School of ScienceWestlake UniversityHangzhou 310024 Nanotechnology and Functional Materials Department of Materials Sciences and EngineeringThe Angstrom LaboratoryUppsala UniversityUppsala 75103 Institute of Artificial Photosynthesis(IAP) State Key Laboratory of Fine ChemicalsDalian University of Technology(DUT)Dalian 116024

Isolation of RuⅢ-bda(17-electron specie)complex with an aqua ligand(2-electron donor)is challenging due to violation of the 18-electron *** considerable efforts have been dedicated to mechanistic studies of water oxidation by the Ru-bda family,the structure and initial formation of the Ru^(Ⅲ)-bda aqua complex are still ***,we challenge this often overlooked step by designing a pocketshape Ru-based complex *** computational studies showed that 1 possesses the crucial hydrophobicity at the Ru^(V)(O)state as well as similar probability of access of terminal O to solvent water molecules when compared with classic Ru-bda *** characterization of single-crystal structures at the Ru^(Ⅱ) and Ru^(Ⅲ) states,a pseudo seven-coordinate“ready-togo”aqua ligand with Ru^(Ⅲ)…O distance of 3.62A was *** aqua ligand was also found to be part of a formed hydrogen-bonding network,providing a good indication of how the Ru^(Ⅲ)-OH_(2)complex is formed.

关键词： Ru-bda water oxidation pseudo seven-coordinate Ru^(Ⅲ)-OH_(2)intermediate water preorganization

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Transposable elements significantly contributed to the core promoters in the human genome

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science China(Life sciences) 2019年第4期62卷 489-497页

作者： marten Kellner Wojciech Maka?owski Institute of Bioinformatics Faculty of Medicine University of Münster

Transposable elements(TEs) are major components of the human genome constituting at least half of it. More than half a century ago, Barbara McClintock and later Roy Britten and Eric Davidson have postulated that they might be major players in the host gene regulation. We have scanned a large amount of data produced by ENCODE project for active transcription binding sites(TFBss) located in TE-originated parts of polymerase II promoters. In total, more than 35,000 promoters in six different tissues were analyzed and over 26,000 of them harbored TEs. Moreover, these TEs usually provide one or more of TFBss in the host promoters, which resulted in more than 6% of active TFBss in these regions located in the TE-originated sequences. Rewiring of transcription circuits played a major role in mammalian evolution and consequently increased their functional and morphological diversity. In this large-scale analysis, we have demonstrated that TEs contributed a large fraction of human TFBss. Interestingly,these TFBss usually act in a tissue-specific manner. Thus, our study clearly showed that TEs played a significant role in shaping expression pattern in mammals and humans in particular. Furthermore, since several TE families are still active in our genome,they continue to influence not only our genome architecture but also gene functioning in a broader sense.

关键词： transposable elements genome evolution gene expression evolution transcription factors transcription binding sites,ENCODE project promoters

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surgical reconstruction of spinal cord circuit provides functional return in humans

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Neural Regeneration Research 2017年第12期12卷 1960-1963页

作者： Thomas Carlstedt Nicholas James marten Risling The Wolfson Centre for Age-Related Diseases King's College London Department of Neuroscience Karolinska Institutet

This mini review describes the current surgical strategy for restoring function after traumatic spinal nerve root avulsion in brachial or lumbosacral plexus injury in man. As this lesion is a spinal cord or central nervous injury functional return depends on spinal cord nerve cell growth within the central nervous system. Basic science, clinical research and human application has demonstrated good and useful motor function after ventral root avulsion followed by spinal cord reimplantation. Recently, sensory return could be demonstrated following spinal cord surgery bypassing the injured primary sensory neuron. Experimental data showed that most of the recovery depended on new growth reinnervating peripheral receptors. Restored sensory function and the return of spinal reflex was demonstrated by electrophysiology and functional magnetic resonance imaging of human cortex. This spinal cord surgery is a unique treatment of central nervous system injury resulting in useful functional return. Further improvements will not depend on surgical improvements. Adjuvant therapy aiming at ameliorating the activity in retinoic acid elements in dorsal root ganglion neurons could be a new therapeutic avenue in restoring spinal cord circuits after nerve root avulsion injury.

关键词： plexus injury root avulsion spinal cord surgery motor sensory recovery adjuvant therapy

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The current performance of biodegradable magnesium-based implants in magnetic resonance imaging:A review

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Bioactive Materials 2021年第12期6卷 4360-4367页

作者： Jonathan Espiritu Martin Meier Jan-marten seitz syntellix Ag HannoverGermany Hannover Medical school HannoverGermany

Magnesium-based implants are re-emerging as a substantial amendment to standard orthopaedic implants.A brief introduction of magnesium(Mg)as a biodegradable material and basic magnetic resonance imaging(MRI)principles are *** review aims to highlight the current performance of these implants during examinations with *** also aim to summarise comparisons between Mg-based implants with current standards to emphasise the promotion of biodegradable implants in clinical practice.A comprehensive search of current literature on Mg-based implants and the utilisation of MRI in the studies was ***,recorded artefact behaviour of Mg-based implants during MRI was investigated.A total of nine studies were included in which MRI was employed to image Mg-based *** those studies,four of the nine discuss artefact production caused by the *** successfully imaged regions of interest over all and produced fewer artefacts than other materials used in the *** was employed in contrast angiography,bone growth observation,bone infection healing,and blood *** capabilities of an implant material are vital to translating products into clinical *** findings presented in this review suggest and support the use of Mg-based implants due to their successful visual compatibility with MRI techniques.

关键词： Magnetic resonance imaging Magnesium Biodegradable implants Medical imaging Patient safety

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C-Terminus-Mediated Voltage gating of Arabidopsis guard Cell Anion Channel QUAC1

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Molecular Plant 2013年第5期6卷 1550-1563页

作者： Patrick Mumm Dennis Imes Enrico Martinoia Khaled A.s. AI-Rasheid Dietmar geiger Irene marten Rainer Hedrich Institute for Molecular Plant Physiology and Biophysics University of Wurzburg Julius-von-Sachs Platz 2 D-97082 Wurzburg Germany Institute of Plant Biology University of Zurich Zollikerstrasse 107 Zurich Switzerland King saud University Zoology Department College of Science PO Box 2455 Riyadh 11451 Saudi Arabia

Anion transporters in plants play a fundamental role in volume regulation and signaling. Currently, two plasma membrane-located anion channel familiesmsLAC/sLAH and ALMTmare known. Among the ALMT family, the root-expressed ALuminium-activated Malate Transporter 1 was identified by comparison of aluminum-tolerant and Al3＋-sensitive wheat cultivars and was subsequently shown to mediate voltage-independent malate currents. In con- trast, ALMT12/QUAC1 （QUickly activating Anion Channel1） is expressed in guard cells transporting malate in an Al3＋- insensitive and highly voltage-dependent manner. so far, no information is available about the structure and mechanism of voltage-dependent gating with the QUAC1 channel protein. Here, we analyzed gating of QUACl-type currents in the plasma membrane of guard cells and QUACl-expressing oocytes revealing similar voltage dependencies and activation- deactivation kinetics. In the heterologous expression system, QUAC1 was electrophysiologically characterized at increas- ing extra- and intracellular malate concentrations. Thereby, malate additively stimulated the voltage-dependent QUAC1 activity. In search of structural determinants of the gating process, we could not identify transmembrane domains com- mon for voltage-sensitive channels. However, site-directed mutations and deletions at the C-terminus of QUAC1 resulted in altered voltage-dependent channel activity. Interestingly, the replacement of a single glutamate residue, which is con- served in ALMT channels from different clades, by an alanine disrupted QUAC1 activity. Together with C- and N-terminal tagging, these results indicate that the cytosolic C-terminus is involved in the voltage-dependent gating mechanism of QUAC1.

关键词： C-terminal deactivation R-type/QUAC-type anion channel single-channel conductance gating modifier.

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New trends and insights in facial fracture treatment in the United states

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Plastic and Aesthetic Research 2023年第1期10卷 615-628页

作者： Ronald K.Akiki Joseph Crozier marten Basta Albert s.Woo Department of Plastic and Reconstructive surgery The Warren Alpert Medical of Brown UniversityProvidenceRI 02903USA

Aim:Facial fractures have multiple etiologies,including motor vehicle collisions,interpersonal violence,falls,and sports-related *** objectives of this study are to reassess,compare,and expand the epidemiologic analysis and postoperative complication rates of facial fracture ***,we sought to compare the length of stay and operative time outcomes between plastic surgeons and non-plastic ***:NsQIP(National surgical Quality Improvement Program)participant databases were queried to identify all patients undergoing facial fracture *** data was divided into two groups and compared by surgeon specialty:patients operated on by a plastic surgeon and patients operated on by a non-plastic *** primary outcomes of interest were operation time and length of *** complications included wound complications,mortality,return to the OR,and major ***:3,354 patients underwent facial fracture repair(2012 to 2016).In men,the most common fracture was mandibular(40.9%);in women,the most frequent was orbital(32.4%).79.6%had single facial fractures and 20.4%had multiple facial *** surgeons’operating time was less than that of non-plastic surgeons(P=0.0007).The average length of stay was higher for the plastic group(mean=1.65 days,plastic)(Pstoperative complication variables showed no statistically significant differences between the plastic and nonplastic ***:Continuous epidemiologic analysis is vital for the proper allocation of healthcare resources to the most affected facial fracture patients in the *** of complication rates between surgical specialties allows a better understanding of the management of facial fracture patients on a national *** data analysis may allow surgeons to better counsel patients preoperatively and improve inter-specialty collaboration.

关键词： Craniofacial trauma plastic surgery population

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Potential Autonomous selfing in gesneria citrina (gesneriaceae),a specialized Hummingbird Pollinated species with Variable Expression of Herkogamy

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Journal of Integrative Plant Biology 2009年第10期51卷 973-978页

作者： Xin-sheng Chen silvana marten-Rodriguez Qing-Jun Li Charles B. Fenster Xishuangbanna Tropical Botanical garden the Chinese Academy of Sciences Mengla 666303 China Department of Biology University of Maryland College Park MD 20742 USA Herbario de la Universidad de Costa Rica Escuela de Biologia Ciudad Universitaria Rodrigo Facio San Pedro San Jose Costa Rica

species with mixed mating systems often demonstrate variable expression of breeding system characteristics and thus represent the opportunity to understand the factors and mechanisms that promote both outcrossed and selfed seed production. Here, we investigate variation in levels of herkogamy （variation in stigma-anther separation distance） in a Puerto Rican population of hummingbird pollinated gesneria citrina Urban. There is significant variation in herkogamy levels among individuals of this species and stigma-anther separation is negatively associated with the ability to set fruits and seeds in the absence of pollinators. The variation in levels of herkogamy may represent a mechanism to ensure the production of some self-fertilized progeny in the absence of hummingbird pollinators. We also describe a novel breeding system in g. citrina, where stamens elongate over time to reach stigma height, but stamen elongation is accelerated by pollination. These results suggest that once the flowers are pollinated, stamen elongation may favor increased pollen removal and siring success, while the reduction in stigma-anther distance no longer imposes the risk of interference between male and female functions. We discuss our findings of breeding system variation in the context of pollination system evolution in an island setting （Antillean islands）.

关键词： mixed-mating pollen limitation pollination system Puerto Rico reproductive assurance stigma-anther separation.

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geochronology and Petrogenesis of Late Carboniferous to Early Permian Basalts in the Central Lhasa subterrane, southern Tibet: Implications for the Evolution of the sumdo Paleo-Tethys Ocean

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Acta geologica sinica(English Edition) 2024年第4期98卷 955-968页

作者： MA Wang LIU Yingchao YANg Zhusen Jan-marten HUIZENgA LI Zhenqing YUE Longlong ZHAO sibo school of Earth sciences and Resources China University of GeosciencesBeijing 100083China Institute of geology Sinoprobe LaboratoryChinese Academy of Geological SciencesBeijing 100037China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Faculty of Environmental sciences and Natural Resource Management Norwegian University of Life SciencesNO-1432ÅsNorway Economic geology Research Centre(EgRU) College of Science and EngineeringJames Cook UniversityTownsvilleQueensland 4811Australia Department of geology University of JohannesburgAuckland Park 2006South Africa

Basalts from the Late Carboniferous to Early Permian are extensively developed in the central Lhasa subterrane, southern Tibet. studying the petrogenesis of these rocks may have implications for the late Paleozoic arc magmatism along the central Lhasa subterrane uncovering more of the evolution of the sumdo Paleo-Tethys Ocean and its dynamic mechanism. Basalt samples from the Luobadui Formation in the Leqingla area, NW of Linzhou City in the central Lhasa subterrane, southern Tibet exhibit arc-like geochemical signatures in a subduction-zone tectonic setting characterized by high Al_(2)O_(3) and low TiO_(2) contents, fractionated REE patterns with low Nb/La ratios and high LREE concentrations, and negative HFsE anomalies. Based on their higher Th/Ce, Nb/Zr, and lower Ba/Th, Pb/Nd ratios, slightly negative to positive ε_(Nd)(t) values, and the relatively high sr-Pb isotopic compositions, these samples were probably derived from partial melting of a depleted mantle source of garnet + spinel lherzolite, metasomatized by subducted sediments around 297 Ma. Modeling of the trace elements indicates that these basalts experienced fractional crystallization of olivine, clinopyroxene and minor plagioclase during magma ascent and eruption. It is proposed that these Late Carboniferous–Early Permian basalts are associated with the northward subduction of the sumdo Paleo-Tethys Ocean seafloor along the southern margin of the central Lhasa subterrane.

关键词： geochemistry northward subduction sumdo Paleo-Tethys Ocean Lhasa terrane Tibet

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Can liver stiffness measurement accurately predict disease progression and clinical outcome in patients with metabolic dysfunction-associated steatotic liver disease and bridging fibrosis or cirrhosis?

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Hepatobiliary surgery and Nutrition 2023年第6期12卷 912-915页

作者： Diederick J.van Doorn Adriaan g.Holleboom R.Bart Takkenberg Joanne Verheij marten A.Lantinga Department of gastroenterology and Hepatology Amsterdam UMCUniversity of AmsterdamAmsterdam Gastroenterology Endocrinology MetabolismAmsterdamThe Netherlands Department of Vascular Medicine Internal MedicineAmsterdam UMCUniversity of AmsterdamAmsterdam Gastroenterology Endocrinology MetabolismAmsterdamThe Netherlands Department of Hepatopancreatobiliary Pathology Amsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands

Diederick *** Doorn1,Adriaan ***2,*** Takkenberg1,Joanne Verheij3,marten ***11Department of gastroenterology and Hepatology,Amsterdam UMC,University of Amsterdam,Amsterdam gastroenterology Endocrinology Metabolism,Amsterdam,The Netherlands;2Department of Vascular Medicine,Internal Medicine,Amsterdam UMC,University of Amsterdam,Amsterdam gastroenterology Endocrinology Metabolism,Amsterdam,The Netherlands;3Department of Hepatopanc Metabolic dysfunction-associated steatotic liver disease(MAsLD)-until recently termed non-alcoholic fatty liver disease(NAFLD)-is a rising cause of chronic liver disease with an estimated global prevalence of 30%(1).

关键词： Cirrhosis liver stiffness steatotic liver disease

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