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Fine-Tuning of Structural Distortion and Magnetic Anisotropy by Organosulfonates in Octahedral Cobalt(Ⅱ)Complexes

Chinese Journal of Chemistry 2022年第18期40卷 2193-2202页

作者： Dong Shao fang-Xue Xu Lei Yin hong-Qing Li Yu-Chen Sun Zhong-Wen Ouyang Zhen-Xing Wang Yi-Quan Zhang Xin-Yi Wang State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China Hubei Key Laboratory of Processing and Application of Catalytic Materials College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggangHubei438000 China Jiangsu Key Laboratory for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210097 China Wuhan National High Magnetic Field Centre Huazhong University of Science and TechnologyWuhanHubei430074 China

Precise modulation of the magnetic anisotropy of metal ions remains highly important for the development of high–performance single-molecule magnets(SMMs).We herein reported the synthetic,structural,spectral,magnetic,and computational studies on four mononuclear Co^(Ⅱ) complexes in a distorted octahedral environment.The change of the organosulfonate anions triggers significant modification of the distorted octahedral CoN6 coordination sphere,which enables us to tackle the influence of the structural distortion on the magnetic anisotropy in these complexes.Magnetic measurements revealed that the four complexes possess easy–plane magnetic anisotropy with large and positive zero-field splitting parameters,which decrease with the increasing distortion of the pseudo–octahedral Co^(Ⅱ) coordination geometry.This correlation was further confirmed by high–frequency/–field EPR(HF–EPR)spectra and theoretical calculations.Dynamic magnetic susceptibility measurements indicate that these complexes both exhibit slow magnetic relaxation under an external dc field,indicating the field-induced single-ion magnets(SIMs)of the four complexes.These results indicate that structural distortion plays an important role in the magnetic anisotropy of CoⅡcomplexes and should be carefully considered in the design of molecular complexes with high magnetic anisotropy.

关键词： Cobalt Solid-state structures Magnetic properties Single-molecule magnets /Magnetic anisotropy

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Comparison of cell wall changes of two different types of apple cultivars during fruit development and ripening

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农业科学学报:英文版 2023年第9期22卷 2705-2718页

作者： LI Xiang-lu SU Qiu-fang JIA Rong-jian WANG Zi-dun FU Jiang-hong GUO Jian-hua YANG Hui-juan ZHAO Zheng-yang College of Horticulture Northwest A&F UniversityYangling 712100P.R.China Apple Engineering and Technology Research Center of Shaanxi Province Yangling 712100P.R.China

Fruit development and ripening is a complex procedure(Malus×domestica Borkh.)and can be caused by various factors such as cell structure,cell wall components,and cell wall hydrolytic enzymes.In our study,we focused on the variations in fruit firmness,cell wall morphology and components,the activity of cell wall hydrolytic enzymes and the expression patterns of associated genes during fruit development in two different types of apple cultivars,the hard-crisp cultivar and the loose-crisp cultivar.In this paper,the aim was to find out the causes of the texture variations between the different type cultivars.Cell wall materials(CWMs),hemicellulose and cellulose content were strongly associated with variations in fruit firmness during the fruit development.The content of water soluble pectin(WSP)and chelator soluble pectin(CSP)gradually increased,while the content of ionic soluble pectin(ISP)showed inconsistent trends in the four cultivars.The activities of polygalacturonase(PG),β-galactosidase(β-gal),cellulase(CEL),and pectate lyase(PL)gradually increased in four cultivars.And the activities of PG,β-gal,and CEL were higher in‘Fuji’and‘Honeycrisp’fruit with the fruit development,while the activity of PL of‘Fuji’and‘Honeycrisp’was lower than that of‘ENVY’and‘Modi’.Both four cultivars of fruit cells progressively became bigger as the fruit expanded,with looser cell arrangements and larger cell gaps.According to the qRT-PCR,the relative expression levels of MdACO and Mdβ-gal were notably enhanced.Our study showed that there were large differences in the content of ISP and hemicellulose,the activity of PL and the relative expression of Mdβ-gal between two different types of apple cultivars,and these differences might be responsible for the variations in the texture of the four cultivars.

关键词： apple(Malus×domestica Borkh.) fruit softening cell wall firmness

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涠西南流沙港组页岩储层地质特征及可压性评价

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科学技术与工程 2024年第15期24卷 6241-6253页

作者：姜洪丰柳兵高永德申颍浩王小琼孙中华刘鹏宇白杰吴楠中海石油(中国)有限公司湛江分公司湛江524057 中国石油大学(北京)非常规油气科学技术研究院北京102249

涠西南凹陷流沙港组页岩油资源丰富,但该储层地质条件复杂,储层可压性评价难度较大,亟需开展相关研究。综合岩心物性分析、核磁共振、扫描电镜、岩石热解、X射线衍射和力学实验等资料,分析了流沙港组页岩油储层地质特征,采用耦合脆性指... 详细信息

涠西南凹陷流沙港组页岩油资源丰富,但该储层地质条件复杂,储层可压性评价难度较大,亟需开展相关研究。综合岩心物性分析、核磁共振、扫描电镜、岩石热解、X射线衍射和力学实验等资料,分析了流沙港组页岩油储层地质特征,采用耦合脆性指数、水平应力差异系数和裂隙密度的可压性评价模型对不同类型油页岩进行可压性评价。研究表明,流沙港组页岩孔隙度主要集中在1%~5%,渗透率多小于0.1×10^(-3)μm^(2),储层表现为低孔低渗特征。孔径以微孔、介孔为主,主要集中在0.001~0.05μm,页岩储集空间类型包括晶间孔、有机质孔、粒间孔和微裂隙4种孔隙类型。流二段泥页岩、油页岩的有机质类型分别为Ⅱ_(1)-Ⅱ_(2)型、Ⅰ-Ⅱ_(1)型,普遍处于成熟阶段。储层岩石主要由长英质矿物组成,平均黏土矿物含量为33.24%。夹层型和互层型油页岩脆性较基质型和纹层型油页岩好,岩石储层各向异性较强。可压性评价结果显示:基质型和纹层型油页岩可压性指数较低,页岩油动用难度大;夹层型油页岩可压性指数为51.16%,具有一定的压裂改造潜力;互层型油页岩可压性指数最高,达到了57.03%,建议优先进行储层压裂改造。本研究对深入理解流沙港组页岩油储层地质特征和后期压裂施工具有重要意义。

关键词：流沙港组页岩油地质特征可压性评价涠西南

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Report on Childhood Obesity in China (10): Association of Sleep Duration with Obesity

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Biomedical and Environmental Sciences 2012年第2期25卷 133-140页

作者： MENG Li Ping LIUAi Ling HU xiao Qi ZHANG Qian DU Song Ming fang hong Yun MA Jun XU Gui Fa LI Ying GUO hong Wei DU Lin MA Guan Sheng National Institute for Nutrition and Food Safety Chinese Center for Disease Control and Prevention Beijing 100050 China Beijing University Health Science Center Beijing 100191 China Shandong University Jinan 250012 Shandong China Public Health College Harbin Medical University Harbinl 50081Heilongjiang China Fudan University Shanghai 200032 China Guangzhou Center for Diseases Prevention and Control Guangzhou 510440 Guangdong China

Objectives To explore the association of sleep duration with obesity among children in urban areas of China.Methods A total of 6 576 children（3 293 boys and 3 283 girls） aged 7-11 years were randomly selected from 36 primary schools in 6 metropolitan cities in China.A 7-day Physical Activity Recall was used to assess the sleep duration and physical activity level.The height,weight,waist circumference（WC） and percentage of body fat（%BF,as determined by bioelectrical impedance analysis technique） were measured by following the standardized operation procedures.The information on demography,lifestyle and eating habits was collected with a self-administered questionnaire from participants and their parents.Results The average sleep duration per night in the children was 9.7 h with the decreasing trends along with the increase of age（P0.05）.The sleep duration was negatively associated with body mass index（BMI） and WC in both boys and girls after adjustment for confounders（β value-0.23 and-0.82 for boys,-0.24 and-0.91 for girls,respectively,P0.01）.However,no significant association of sleep duration with %BF was found.Children who slept less than 9.0 h per night had a higher risk for overweight and obesity（OR=1.29,95% CI：1.01,1.64） and abdominal obesity（OR=1.38,95% CI：1.04,1.83） as compared with those who slept for 10.0-10.9 h.Conclusions Short sleep duration is associated with obesity.It is important to ensure adequate sleep duration of children and foster their healthy lifestyle at an early stage of life.

关键词： Sleep duration Obesity Children China

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Investigation of the biological roles of autophagy in appressorium morphogenesis in Magnaporthe oryzae

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第10期9卷 793-796页

作者： xiao-hong LIU Fu-cheng LIN State Key Laboratory for Rice Biology Biotechnology Institute Zhejiang University Hangzhou 310029 China

Magnaporthe oryzae has been used as a primary model organism for investigating fungus-plant interaction. Many researches focused on molecular mechanisms of appressorium formation to restrain this fungal pathogen. Autophagy is a very high conserved process in eukaryotic cells. Recently, autophagy has been considered as a key process in development and differentia-tion in M. oryzae. In this report, we present and discuss the current state of our knowledge on gene expression in appressorium formation and the progress in autophagy of rice blast fungi.

关键词：附着胞基因表达自体吞噬细胞生物学研究

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Uridine alleviates high-carbohydrate diet-induced metabolic syndromes by activating sirt1/AMPK signaling pathway and promoting glycogen synthesis in Nile tilapia(Oreochromis niloticus)

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Animal Nutrition 2023年第3期14卷 56-66页

作者： Nan-Nan Zhou Tong Wang Yu-Xin Lin Rong Xu hong-Xia Wu Fei-Fei Ding fang Qiao Zhen-Yu Du Mei-Ling Zhang Laboratory of Aquaculture Nutrition and Environmental Health(LANEH) School of Life SciencesEast China Normal UniversityShanghai 200241China

Carbohydrates have a protein sparing effect,but long-term feeding of a high-carbohydrate diet(HCD)leads to metabolic disorders due to the limited utilization efficiency of carbohydrates in fish.How to mitigate the negative effects induced by HCD is crucial for the rapid development of aquaculture.Uridine is a pyrimidine nucleoside that plays a vital role in regulating lipid and glucose metabolism,but whether uridine can alleviate metabolic syndromes induced by HCD remains unknown.In this study,a total of480 Nile tilapia(Oreochromis niloticus)(average initial weight 5.02±0.03 g)were fed with 4 diets,including a control diet(CON),HCD,HCD+500 mg/kg uridine(HCUL)and HCD+5,000 mg/kg uridine(HCUH),for 8 weeks.The results showed that addition of uridine decreased hepatic lipid,serum glucose,triglyceride and cholesterol(P<0.05).Further analysis indicated that higher concentration of uridine activated the sirtuin1(sirt1)/adenosine 5-monophosphate-activated protein kinase(AMPK)signaling pathway to increase lipid catabolism and glycolysis while decreasing lipogenesis(P<0.05).Besides,uridine increased the activity of glycogen synthesis-related enzymes(P<0.05).This study suggested that uridine could alleviate HCD-induced metabolic syndrome by activating the sirt1/AMPK signaling pathway and promoting glycogen synthesis.This finding reveals the function of uridine in fish metabolism and facilitates the development of new additives in aquatic feeds.

关键词： Uridine High-carbohydrate diet Metabolism AMPK Nile tilapia

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橡胶外科手套测试分析及监督抽检方案的研究

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合成材料老化与应用 2024年第2期53卷 40-43页

作者：胡晓亮曲翠翠王龙浩甄辉张莉徐方明浙江省医疗器械检验研究院浙江杭州310018􁽈

医用橡胶手套多家实验室比对结果不满意,依据日常检测经验,对检测过程中未规定的工装材料、夹具以及测试步骤提出解决方案,供其他实验室参考。为验证外科手套拉伸性能测试结果与试样裁样方向有关,对外科手套按长度、宽度方向裁样,进行... 详细信息

医用橡胶手套多家实验室比对结果不满意,依据日常检测经验,对检测过程中未规定的工装材料、夹具以及测试步骤提出解决方案,供其他实验室参考。为验证外科手套拉伸性能测试结果与试样裁样方向有关,对外科手套按长度、宽度方向裁样,进行拉伸性能测试。研究表明,老化前、老化后外科手套的拉伸性能,长度方向裁样测试数据优于宽度方向裁样测试数据。根据验证结果,对检测机构和外科手套标准起草单位提出优化意见。为加强外科手套的监管,制定监督抽检的抽检方案,供监管部门参考。

关键词：医用橡胶手套外科手套拉伸性能监督抽检

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Synthesis of surface sulfated BiWO with enhanced photocatalytic performance

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Journal of Environmental Sciences 2012年第12期24卷 2180-2190页

作者： Yongming Ju Jianming hong Xiuyu Zhang Zhencheng Xu Dongyang Wei Yanhong Sang xiaohang fang Jiande fang Zhenxing Wang South China Institute of Environmental Science Ministry of Environmental ProtectionGuangzhou 510655China Center of Material Analysis Nanjing UniversityNanjing 210093China

Sulfated BiWO （SBiWO） was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO （BiWO）. The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visible- light-responsive range without destroying the crystal lattice. Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green （MG） under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps （MPEDL_2） and under visible light （L 〉 420 nm）. The results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 （BiWO） to 0.3328 rain-1 （SBiWO- 1 ）. Similar results were also obtained for the visible light-driven reaction. Furthermore, radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1. This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at k = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed.

关键词： sulfated BiWO photocatalytic Malachite Green visible light microwave

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The roles of cysteines in the heme domain of human soluble guanylate cyclase

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Chinese Chemical Letters 2012年第8期23卷 973-976页

作者： fang fang Zhong xiao xiao Liu Jie Pan Zhong Xian Huang Xiang Shi Tan Department of Chemistry Fudan UniversityShanghai 200433China Institutes of Biomedical Sciences Fudan UniversityShanghai 200433China

Soluble guanylate cyclase（sGC） is a critical heme-containing enzyme involved in NO signaling.The dimerization of sGC subunits is necessary for its bioactivity and its mechanism is a striking and an indistinct issue.The roles of heme domain cysteines of the sGC on the dimerization and heme binding were investigated herein.The site-directed mutations of three conserved cysteines（C78A,C122A and C174S） were studied systematically and the three mutants were characterized by gel filtration analysis,UV-vis spectroscopy and heme transfer examination.Cys78 was involved in heme binding but not referred to the dimerization,while Cys174 was demonstrated to be involved in the homodimerization.These results provide new insights into the cysteine-related dimerization regulation of sGC.

关键词： Human soluble guanylate cyclase sGC Heine domain Cysteine Dimerization

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Identification and characterization of two cleavage fragments from the Aquareovirus nonstructural protein NS80

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Virologica Sinica 2016年第4期31卷 314-323页

作者： Qingxiu Chen Jie Zhang Fuxian Zhang hong Guo Qin fang State Key Laboratory of Virology Wuhan Institute of Virology Chinese Academy of Sciences Wuhan 430071 China University of the Chinese Academy of Sciences Beijing 100039 China

Aquareovirus species vary with respect to pathogenicity,and the nonstructural protein NS80 of aquareoviruses has been implicated in the regulation of viral replication and assembly,which can form viral inclusion bodies(VIBs) and recruit viral proteins to its VIBs in infected cells.NS80 consists of 742 amino acids with a molecular weight of approximately 80 kDa.Interestingly,a short specific fragment of NS80 has also been detected in infected cells.In this study,an approximately58-kDa product of NS80 was confirmed in various infected and transfected cells by immunoblotting analyses using α-NS80 C.Mutational analysis and time course expression assays indicated that the accumulation of the 58-kDa fragment was related to time and infection dose,suggesting that the fragment is not a transient intermediate of protein degradation.Moreover,another smaller fragment with a molecular mass of approximately 22 kDa was observed in transfected and infected cells by immunoblotting with a specific anti-FLAG monoclonal antibody or α-NS80 N,indicating that the 58-kDa polypeptide is derived from a specific cleavage site near the amino terminus of NS80.Additionally,different subcellular localization patterns were observed for the 22-kDa and 58-kDa fragments in an immunofluorescence analysis,implying that the two cleavage fragments of NS80 function differently in the viral life cycle.These results provide a basis for additional studies of the role of NS80 played in replication and particle assembly of the Aquareovirus.

关键词： Aquareovirus nonstructural protein NS80 cleavage fragments subcellular localization functional analysis

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