检索结果-南通市图书馆

Chromium transformation driven by iron Redox cycling in basalt-derived paddy soil with high geological background values

引用

Journal of Environmental Sciences 2023年第3期125卷 470-479页

作者： Ke Zhang Yang Yang Wenting Chi Guojun Chen Yanhong Du Shiwen Hu Fangbai Li Tongxu Liu Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China

The flooding and drainage of paddy fields has great effects on the transformation of heavy metals, however, the transformation of Cr in basalt-derived paddy soil with high geological background values was less recognized. The typical basalt-derived paddy soil was incubated under alternating Redox conditions. The Cr fractions and the dynamics of Fe/N/S/C were examined. The HCl-extractable Cr increased under anaerobic condition and then decreased during aerobic stage. The UV-vis spectra of the supernatant showed that amounts of colloids were released under anaerobic condition, and then re-aggregated during aerobic phase. The scanning transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS) revealed that Fe oxides were reduced and became dispersed during anaerobic stage, whereas Fe(Ⅱ) was oxidized and recrystallized under aerobic condition. Based on these results, a kinetic model was established to further distinguish the relationship between the transformation of Cr and Fe. During anaerobic phase, the reduction of Fe(Ⅲ) oxides not only directly released the structurally bound Cr, but also enhanced the breakdown of soil aggregation and dissolution of organic matter causing indirect mobilization of Cr. During aerobic phase, the oxidation of Fe (Ⅱ) and further recrystallization of newly formed Fe(Ⅲ) oxides might induce the re-aggregation of soil colloids and further incorporation of Cr. In addition,the kinetic model of Cr and Fe transformation was further verified in the pot experiment.The model-based findings demonstrated that the Cr transformation in the basalt-derived paddy soil with high geological background values was highly driven by Redox sensitive iron cycling.

关键词： Chromium Paddy soil Iron oxides Redox High geological background

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Intracellular Redox potential-driven live-cell synthesis of CdSe quantum dots in Staphylococcus aureus

引用

Science China Chemistry 2024年第3期67卷 990-999页

作者： Cai-Qin Wu An-An Liu Xu Li Jia-Wei Tu Juan Kong Ling-Ling Yang Jian-Hong Jia Chuan Wang Bin Hu Zhi-Xiong Xie Dai-Wen Pang The Institute for Advanced Studies College of Chemistry and Molecular SciencesCollege of Life SciencesHubei Key Laboratory of Cell HomeostasisWuhan UniversityWuhan 430072China Research Center for Analytical Sciences College of ChemistryState Key Laboratory of Medicinal Chemical BiologyTianjin Key Laboratory of Biosensing and Molecular RecognitionFrontiers Science Center for New Organic MatterFrontiers Science Center for Cell Responsesand Haihe Laboratory of Sustainable Chemical TransformationsNankai UniversityTianjin 300071China

Biosynthesized semiconductor quantum dots(QDs) have bright fluorescence,adjustable particle sizes,and environmental friendliness,endowing them with convenience and potential for biological applications.Due to the unclear mechanism of the cellular environment on the live-cell synthesis of QDs,it is still difficult to regulate their optical properties.Here,the critical role of the intracellular Redox environment in regulating the fluorescence properties of biosynthesized CdSe QDs in Staphylococcus aureus(S.aureus) has been elucidated.The glutathione peroxidase(GPx) activity directly affects the intracellular H_(2)O_(2) produced in the SeO_(3)^(2-) reduction,which further manipulates the glutathione Redox cycle to determine the content of low-valence Seintermediates.As a result,the fluorescence intensity of the synthesized CdSe QDs increases by 60% in the GPx overexpressed cells.The cellular Redox potential that is controlled by the GSH Redox cycle provides the driving force for the reduction of SeO_(3)^(2-),facilitating the synthesis of CdSe QDs in S.aureus cells.The proposed mechanism of the cellular Redox state provides a new perspective for regulating the synthesis of semiconductor nanomaterials in live cells.

关键词： Redox H_(2)O_(2) peroxidase quantum dot Staphylococcus aureus

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TGA factors promote plant root growth by modulating Redox homeostasis or response

引用

Journal of Integrative Plant Biology 2022年第8期64卷 1543-1559页

作者： Xiaochen Hu Liyun Yang Mengfei Ren Lin Liu Jing Fu Hongchang Cui State Key Laboratory of Crop Stress Biology for Arid Areas College of Life SciencesNorthwest A&F UniversityYangling 712100China Department of Biological Science Florida State UniversityTallahasseeFL 32306USA

To identify novel regulators of stem cell renewal,we mined an existing but little explored cell typespecific transcriptome dataset for the Arabidopsis root.A member of the TGA family of transcription factors,TGA8,was found to be specifically expressed in the quiescent center(QC).Mutation in TGA8 caused a subtle root growth phenotype,suggesting functional redundancy with other TGA members.Using a promoter::HGFP transgenic approach,we showed that all TGA factors were expressed in the root,albeit at different levels and with distinct spatial patterns.Mutant analyses revealed that all TGA factors examined contribute to root growth by promoting stem cell renewal,meristem activity,and cell elongation.Combining transcriptome analyses,histochemical assays,and physiological tests,we demonstrated that functional redundancy exists among members of cladesⅡandⅤor those in cladesⅠandⅢ.These two groups of TGA factors act differently,however,as their mutants responded to oxidative stress differently and quantitative reverse transcription polymerase chain reaction assays showed they regulate different sets of genes that are involved in Redox homeostasis.Our study has thus uncovered a previously unrecognized broad role and a mechanistic explanation for TGA factors in root growth and development.

关键词： Arabidopsis thaliana quiescent center reactive oxygen species Redox root apical meristem TGA family

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A dual-switching spin-crossover framework with Redox regulation and guest response

引用

Science China Chemistry 2023年第6期66卷 1744-1749页

作者： Long-Fei Wang Si-Guo Wu Ze-Yu Ruan Ai-Qi Jian Wen Cui Zhao-Ping Ni Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China CNRS Centre de Recherche Paul PascalPessac F-33600France

A dual-switching spin crossover metal-organic framework(SCO-MOF)[Fe(TPB){Pt^(Ⅱ)(CN)_(4)}]·3iPrOH·4H_(2)O(TPB=1,2,4,5-tetra(pyridin-4-yl)benzene)is developed via the combination of Redox-active framework and tunable guests.The reversible structural transformation between[Pt^(Ⅱ)(CN)_(4)]^(2-) and[Pt^(Ⅳ)Br_(2)(CN)_(4)]^(2-)moieties can be manipulated by Redox post-synthetic modification(PSM),which results in the change of SCO behaviors from step-wise to one-step.The influences of the oxidative addition of bromides on the ligand field splitting of Fe side are further explored by density functional theory calculations.Besides,the modulation of hysteretic four-/three-step,one-step and four-step SCO behaviors can be achieved by tuning the composition of guest molecules.Therefore,the combination of electronic bistability,Redox reaction and guest recognition in a homogeneous lattice provides a utility platform for designing multi-responsive molecule-based materials.

关键词： spin crossover iron(Ⅱ) post-synthetic modification Redox host-guest interaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sequence-sorted Redox-switchable hetero[3]rotaxanes

引用

Organic Chemistry Frontiers 2022年第1期9卷 64-74页

作者： Marius Gaedke Henrik Hupatz Felix Witte Susanne M.Rupf Clara Douglas Hendrik V.Schröder Lukas Fischer Moritz Malischewski Beate Paulus Christoph A.Schalley Institut für Chemie und Biochemie der Freien Universität Berlin Arnimallee 2014195 BerlinGermany Institut für Chemie und Biochemie der Freien Universität Berlin Arnimallee 2214195 BerlinGermany Institut für Chemie und Biochemie der Freien Universität Berlin Fabeckstr.34/3614195 BerlinGermany

From a library of five crown ether macrocycles with different ring sizes and Redox-active moieties,such as tetrathiafulvalene(TTF)and naphthalene dimiide(NDI),directional heterocircuit[3]rotaxanes were constructed.Using an axle with two binding sites with different steric accessibility,the concept of integrative self-sorting was applied to program the sequence of functional units in heteropseudo[3]rotaxanes.Depending on binding strength and ring size of the smaller macrocycles,different heteropseudo[3]rotaxane selectivities and stabilities were determined by 2D NMR spectroscopy and tandem mass spectrometry.A heteropseudo[3]rotaxane with rotaxane-like behaviour was isolated chromatographically,displaying electrochemically“frustrated”properties.A robust synthetic procedure was developed allowing the synthesis of four new hetero[3]rotaxanes incorporating specific sequences of functional units.Sequence pseudoisomeric rotaxanes which have the naphthalene diimide subunit at two different positions show distinct electrochemical properties.DFT calculations suggest that this differences could arise from a folding of the structure,in which the Redox-active moieties stack with a stopper unit.This study presents a blueprint for the construction of hetero[3]rotaxanes with sequential control of the functional units along the track of the axle and paves the way to extend the functionality of mechanically interlocked molecules.

关键词： properties Redox Sequence

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Polysaccharide extract from Rosa laevigata fruit attenuates inflammatory obesity by targeting Redox balance and gut interface in high-fat diet-fed rats

引用

Food Science and Human Wellness 2023年第2期12卷 442-453页

作者： Xuejiao Zhang Chenzhong Jin Han Liu Yihong Hu Yunyun Zhou Weiguo Wu Si Qin Lab of Food Function and Nutrigenomics College of Food Science and TechnologyHunan Agricultural UniversityChangsha 410128China College of Food and Chemical Engineering Shaoyang UniversityShaoyang 422000China Collaborative Innovation Center for Field Weeds Control Hunan University of HumanitiesScience and TechnologyLoudi 417000China

Low-molecular-weight polysaccharides(RLPs)extracted from Rosa laevigata fruits showed multiple biofunctions in Asia.This study aimed to investigate its anti-inflammatory obesity effect in high-fat dietfed rats and further elucidated the underlying molecular mechanism by multi-omics methods.The results showed that RLPs administration had significantly restored immune organ indexes and reduced body weight gain.RNA-seq revealed that the effect of RLPs was partially attributed to its regulation on PPARs signaling by increasing the expressions of Scd,Acox3 and Hmgcs2,and on other Redox-related pathways by decreasing the expressions of Cyp2 e1,Il1-r1 and Lbp.Moreover,16 S rRNA sequencing coupled with metagenome sequencing showed that RLPs had significantly reduced the ratio of Firmicutes/Bacteroidetes from 8.01 to2.37,and significantly increased the relative abundances of Alistipes,Prevotella,and Akkermansia from 0.36%,1.10%and 2.61%to 0.65%,2.37%and 4.42%,respectively.Spearman correlation analysis result indicated that the abundances of Lachnospiraceae,Prevotella and Bacteroidales were significantly negatively correlated with obesity phenotype,liver function and inflammatory factors.These results revealed that RLPs exerted significant anti-inflammatory obesity property partially via regulation on gut microbiota interface and the Redox balance.Therefore,RLPs could be a promising functional food resource with the potential for Redox imb alance-related diseases chemoprevention.

关键词： Rosa laevigata Polysaccharides Multi-omics Redox Gut microbiota

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Early Diagenetic Dolomite as a Potential Archive of PaleoRedox Fluctuations in an Early Tonian Marine Basin?

引用

Acta Geologica Sinica(English Edition) 2022年第2期96卷 607-620页

作者： KANG Junyao LI Chenqing DONG Lin XIAO Shuhai Key Laboratory of Orogenic Belts and Crustal Evolution MOEBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Department of Geosciences Virginia TechBlacksburgVA 24060U.S.A.

The Tonian Period witnessed important environmental changes and critical evolutionary innovations. Published iron speciation data suggest a global Redox transition of mid-depth seawaters from euxinic to ferruginous in early Tonian, but details of this transition remain unknown. This study explores Tonian stromatolitic carbonates as a possible archive of paleoenvironmental changes, through the investigation of dolomitic limestones and dolostones associated with stromatolites of the Weiji Formation in the Huaibei region of North China. Three types of dolomitization are recognized on the basis of petrographic and geochemical data. Type Ⅰ and Ⅱ dolomitization resulted in dolomitic limestones characterized by LREE depletions, MREE enrichments, positive yttrium anomalies, and a lack of europium anomalies, indicating early diagenetic dolomitization, possibly in the iron reduction zone and under the influence of bottom seawater. The lack of cerium anomalies in these carbonates suggests anoxia in shallow marine environments. The coexistence of ferroan/non-ferroan dolomite crystals and overgrowth bands is interpreted as possible evidence for rapid fluctuations between iron-rich and iron-depleted conditions in pore-waters or seawaters. In contrast, type Ⅲdolomitization resulted in pervasively dolomitized stromatolitic carbonates and likely represents late diagenetic processes. This study highlights the potential of early diagenetic dolomite as an archive for paleoenvironmental investigations.

关键词： Redox early diagenesis rare earth elements dolomite Neoproterozoic North China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bromine and oxygen Redox species mediated highly selective electro-epoxidation of styrene

引用

Organic Chemistry Frontiers 2022年第2期9卷 436-444页

作者： Yuchi Zhang Asma Iqbal Jiantao Zai Shu-Yu Zhang Hongran Guo Xuejiao Liu Ibrahim ul Islam Hira Fazal Xuefeng Qian Shanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai200240P.R.China

Olefin epoxidation is an essential transformation and arouses great interest among the scientific community for the key role of epoxide in the chemical industry.Traditional methods suffer from harmful oxidants and require harsh operating conditions and complex separation processes.Electro-epoxidation through bromine Redox reactions is an eco-friendly strategy.However,the lack of efficient electrodes always limits the selectivity of epoxidation and results in massive energy consumption.Herein,we found that GF-CoS_(2)/CoS heterostructures anchored on graphite felt(GF-CoS_(2)/CoS)can efficiently facilitate the generation of bromine Redox species on the anode.The synergistic cooperation between the bromine Redox species and oxygen Redox species(generated on a graphite rod cathode)can establish a benign electro-epoxidation system for olefin substrates in an ambient environment.Under the optimized reaction conditions,the epoxidation of styrene can achieve a yield of 97% at 30 mA cm^(-2).Importantly,the applied voltage(4-5 V)is roughly half of the Pt-based electrode system(7.8-9.3 V),hence,saving half of the energy.We demonstrated that our proposed strategy could also be applied to other olefins.Because of the simple,sustainable,and economic advantages of the epoxidation process,we believe this strategy is highly desirable for technical applications.

关键词： Redox epoxidation styrene

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A C_(54)B_(2) Polycyclic π-System with Bilayer Assembly and Multi-Redox Activity

引用

CCS Chemistry 2023年第4期5卷 876-884页

作者： Liuzhong Yuan Jiaxiang Guo Yue Yang Kaiqi Ye Chuandong Dou Yue Wang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012

Doping heteroatoms into polycyclic aromatic hydrocarbons(PAHs)is an efficient strategy to achieve fascinating electronic structures and materials.However,nanoscale B-doped PAHs remain very challenging because of the intrinsic instability of the boron atom and the lack of suitable precursors.In this study,we report a C_(54)B_(2) polycyclicπ-system with one embedded 1,4-diboron-substituted benzene subunit,which was successfully synthesized from doubly B-doped heptazethrene.Thismolecule represents not only the largest B-doped PAH by far but also an unprecedented B-doped nanographene.The fully zigzag-armchair-edged structure creates a planar conformation,thus leading to its unique bilayer assembly behavior.More importantly,it possesses intriguing electronic structure and optoelectronic properties,such as very broad light absorption that covers 350–750 nm,sharp near-infrared fluorescence with a band width of only 26 nm,and reversible five-step Redox capability,all of which are rarely observed for other B-doped PAHs.In addition,this molecule displays distinctive local aromaticity that cannot be reproduced via the reductive manipulation of an allcarbon congener.

关键词： boron polycyclic aromatic hydrocarbons near-infrared fluorescence Redox aromaticity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Triphenylamines consisting of bulky 3,5-di–tert–butyl–4-anisyl group:Synthesis, Redox properties and their radical cation species

引用

Chinese Chemical Letters 2022年第4期33卷 1870-1874页

作者： Manfei Zhou Lijun Mao Yan-Fei Niu Xiao-Li Zhao Xueliang Shi Hai-Bo Yang Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China

Triphenylamine(TPA) derivatives have been widely used as useful building blocks for diverse functional materials because of their excellent Redox activity. Most of the molecular structures of TPA-based organic functional materials contain 4-anisyl groups, which on one hand could reduce their oxidation potential and on the other hand significantly delocalize the spin density of the resultant TPA radical cation species and enhance their stability. However, molecular-level investigation of the Redox behavior of triphenylamines consisting of 4-anisyl group and the electronic structures of their radical cation species has not been reported in the literature. Herein, we design a series of triphenylamines consisting of one, two, or three 3,5-di–tert–butyl–4-anisyl groups and investigate their Redox behaviors and corresponding radical cation species. We disclose that the resonance hybrid and steric protection could both contribute to the stability of triphenylamine radical cations. Moreover, further oxidation leads to an unexpected oxidative demethylation. The findings in this work may reveal new insights for the understanding of the unique Redox properties of 4-anisyl substituted triphenylamines.

关键词： Triphenylamine Radical cation Stability Redox Steric protection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：