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Chinese Journal of Chemistry 2023年第17期41卷 2143-2150页

作者： Hongxin Tao Changquan Tang Yunlong Ma Shu-quan Zhang Ruochuan Liao Qisheng Tu Qingdong Zheng State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences155 Yangqiao West RoadFuzhouFujian 350002China State Key Laboratory of Coordination Chemistry College of Engineering and Applied SciencesNanjing UniversityNanjingJiangsu 210023China University of Chinese Academy of Sciences Beijing 100049China Collegeof ZhichengFuzhou UniversityFuzhouFujian 350002China

Comprehensive Summary,The development of novel building blocks with sp3-hybridized-carbon-free conjugated skeletons is important to further advance and enrich nonfullerene acceptors(NFAs),but this remains a challenge due to the lack of strategies to effectively modulate the aggregation behavior of resulting NFAs.Herein,two novel nitrogen-bridged octacyclic ladder-type heteroarenes end-capped with thiophene rings(BTPS)or selenophene rings(BTPSe)are designed and synthesized as the donor cores for constructing NFAs(MQX-2 and MQX-4).It is found that replacing the sulfur atoms(MQX-2)at the outer positions of the heteroarene core with selenium atoms(MQX-4)can effectively modulate the molecular packing mode of the NFAs.The incorporation of selenium atoms induces stronger O···Se noncovalent interaction than O···S,thus promoting the formation of mixed H/J-type aggregates in MQX-4.Benefiting from more electron hopping channels,MQX-4 exhibits higher electron transport(more than 1-fold enhancement)and photovoltaic properties compared to MQX-2,which forms only H-type aggregates.

关键词： Polymer solar cells Electron acceptors Noncovalent interactions Molecular packing Electron transport

Trinuclear Dy(III)Single-Molecule Magnets with Two-Step Relaxation

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Chinese Journal of Chemistry 2023年第20期41卷 2641-2647页

作者： Yi-shu Jin Cai-Ming Liu Yi-quan zhang Hui-Zhong Kou Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084 China Beijing National Laboratory for Molecular Sciences Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing100190 China Jiangsu Key Lab for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210023 China

The reaction of DyCl_(3)·6H_(2)O with a rigid diacylhydrazone ligand(H_(2)L)afforded a trinuclear precursor[Dy_(3)L_(2)Cl_(3)(H_(2)O)_(2)(CH_(3)OH)]Cl_(2)·3CH_(3)OH(1).The replacement of the Cl-ions and the coordinating solvents by the aryloxides ligands(Lx)-yields three trinuclear complexes[Dy_(3)L_(2)(Lx)_(5)]·nsol(x=1,2-naphthol(2);x=2,7-hydroxycoumarin(3);and x=3,phenol(4)).In complexes 2-4,two end Dy^(3+)centers adopt almost identical N_(4)O_(4) coordination sphere of D6h geometry while the central one adopts N_(4)O_(5) coordination sphere in Cs geometry.Magnetic measurements reveal weak antiferromagnetic interactions in the hydrated samples 2e-4e and two-step slow relaxation process under zero dc field with effective energy barriers Ueff of 439 and 91 K,353 and 40 K,466 and 89 K for SR and FR in 2e-4e,respectively.Such dynamic magnetic behaviour for 4 persists in the magnetically diluted sample of 4@Y.Complex 4 possesses the short Dy-O_(aryloxide) bond distance of 2.055(18)Å,and the largest Ueff among the reported linear trinuclear dysprosium complexes.Moreover,the functionalized aryloxides ligands(Lx)-show photoluminescence via intramolecular energy transfer,making 2e-4e luminescent Dy^(3+)SMMs with high energy barriers.

关键词： Coordination modes Lanthanides Crystal structure Ab initio calculations Magnetic properties Luminescence

Revealing the spacing effect of neighboring side-chains in modulating molecular aggregation and orientation of M-series acceptors

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聚集体(英文)

聚集体(英文) 2023年第4期4卷 166-176页

作者： Yunlong Ma Shaoxin Luan Dongdong Cai Shu-quan Zhang Jin-Yun Wang Qisheng Tu Yuhang Zhu Qingdong Zheng State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhouChina College of Zhicheng Fuzhou UniversityFuzhouChina State Key Laboratory of Coordination Chemistry College of Engineering and Applied SciencesNanjing UniversityNanjingChina

Controlling the aggregation of small-molecule acceptors(SMAs)is essential to obtain an optimal morphology and to improve the photovoltaic performance of polymer solar cells(PSCs).However,reducing intermolecular aggregation of SMAs is usually accompanied by the disruption of compact molecular packing thereby leading to their decreased electron mobilities.Here,two novel M-series SMAs(MD1T and MD2T)based on ladder-type heterononacenes with neighboring side-chains separated by one or two thiophene rings are designed and synthesized.It is found that shortening the spacing of the neighboring side-chains of the SMAs can greatly alleviate the intermolecular aggregation and alter the molecular orientation from bimodal edge-on/face-on to predominant face-on while maintaining the compact molecular packing.As a result,a more favorable morphology with smaller domain sizes is formed for the MD1T-based blend films,which greatly improves the charge generation and charge transport for the corresponding PSCs.The best-performing MD1T-based device affords an efficiency of 12.43%,over seven times higher than that of the MD2T-based device.This work reveals the importance of the spacing between the neighboring side-chains in modulating the molecular aggregation and active layer morphology,and the obtained structure-performance relationships shall provide important guidance for designing highly efficient SMAs.

关键词： aggregation molecular orientation neighboring side-chains polymer solar cells small-molecule acceptors

Acupoint Autohemotherapy Attenuates Atopic Dermatitis Lesions by Regulating Th1/Th2 Balance in DNCB-Induced BALB/c Mice

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Chinese Journal of Integrative Medicine 2022年第7期28卷 612-619页

作者： ZENG Zhi-wen HUANG Jin-quan CHEN Yong YU Xiao ZHU Wei zhang Dong-shu School of Traditional Chinese Medicine Southern Medical UniversityGuangzhou 510515China Department of Traditional Chinese Medicine Affiliated Dongguan People's HospitalSouthern Medical UniversityDongguanGuangdong Province 523058China Department of Rheumatology and Immunology Shenzhen People's HospitalThe Second Clinical Medical College of Jinan UniversityShenzhenGuangdong Province 518020China School of Basic Medical Sciences Southern Medical UniversityGuangzhou 510515China Guangzhou Center for Disease Control and Prevention Guangzhou 510515China

Objective: To evaluate the therapeutic effects of acupoint autohemotherapy(A-AHT) on 1-chloro-2,4-dinitrobenzene(DNCB)-induced atopic dermatitis(AD) in mice focusing on regulating T helper 1/T helper 2(Th1/Th2) immune responses. Methods: Thirty BALB/c mice were divided into 5 groups by a random number table, including normal control(NC), AD model(AD), A-AHT, sham A-AHT(sA-AHT), and acupoint injection of normal saline(A-NS) groups, 6 mice per group. Mice were challenged by DNCB for the establishment of experimental AD model. On the 8th day, except for the NC and AD groups, the mice in the other groups received management once every other day for a total of 28 days. For the A-AHT and sA-AHT groups, 0.05 mL of autologous whole blood(AWB) was injected into bilateral Zusanli(ST 36) and Quchi(LI 11) and sham-acupoints(5 mm lateral to ST 36 and LI 11), respectively. The A-NS group was administrated with 0.05 m L of normal saline by acupoint injection into ST 36 and LI 11. Dermatitis severity for dorsal skin of mice was determined using the Severity Scoring of Atopic Dermatitis(SCORAD) every week. The total immunoglobulin E(IgE), interleukin-4(IL-4), and interferon-gamma(IFN-γ) cytokine levels in serum were examined by enzyme-linked immunosorbent assay(ELISA). Spleen Th1/Th2 expression were analyzed via flow cytometry and immunohistochemical assay was used to detect T-box expressed in T cell(T-bet) and GATA-binding protein 3(GATA3) expressions in skin lesions of mice. Results: Compared with the AD group, both A-AHT and sA-AHT reduced the SCORAD index and serum IgE level(P<0.05 or P<0.01);A-AHT, sA-AHT and A-NS down-regulated serum IL-4 level and upregulated IFN-γ/IL-4 ratio(P<0.05 or P<0.01);A-AHT regulated the Th1/Th2 shift specifically and increased the related transcription factors such as T-bet expression and T-bet/GATA3 ratio(P<0.05). Conclusion: A-AHT showed significant effectiveness on the AD model mice, through regulating Th1/Th2 immune responses.

关键词： acupoint autohemotherapy atopic dermatitis Th1/Th2 immunoglobulin E

Habitat heterogeneity and biotic interactions mediate climate influences on seedling survival in a temperate forest

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Forest Ecosystems 2023年第5期10卷 579-588页

作者： Haikun Liu Hang Shi quan Zhou Man Hu Xiao shu Kerong zhang quanfa zhang Haishan Dang Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan430074China University of Chinese Academy of Sciences Beijing100049China

Seedling stage has long been recognized as the bottleneck of forest regeneration,and the biotic and abiotic processes that dominate at seedling stage largely affect the dynamics of forest.Seedlings might be particularly vulnerable to climate stress,so elucidating the role of interannual climate variation in fostering community dynamics is crucial to understanding the response of forest to climate change.Using seedling survival data of 69 woody species collected for five consecutive years from a 25-ha permanent plot in a temperate deciduous forest,we identified the effects of biotic interactions and habitat factors on seedling survival,and examined how those effects changed over time.We found that interannual climate variations,followed by biotic interactions and habitat conditions,were the most significant predictors of seedling survival.Understory light showed a positive impact on seedling mortality,and seedling survival responded differently to soil and air temperature.Effects of conspecific neighbor density were significantly strengthened with the increase of maximum air temperature and vapor pressure deficits in the growing season,but were weakened by increased maximum soil temperature and precipitation in the non-growing season.Surprisingly,seedling survival was strongly correlated with interannual climate variability at all life stages,and the strength of the correlation increased with seedling age.In addition,the importance of biotic and abiotic factors on seedling survival differed significantly among species-trait groups.Thus,the neighborhood-mediated effects on mortality might be significantly contributing or even inverting the direct effects of varying abiotic conditions on seedling survival,and density-dependent effects could not be the only important factor influencing seedling survival at an early stage.

关键词： Seedling survival Extreme interannual climate Negative density-dependence Species coexistence

High-cycle fatigue crack initiation and propagation in laser melting deposited TC18 titanium alloy

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 665-670页

作者： Yang Wang Shu-quan Zhang Xiang-jun Tian Hua-ming Wang Laboratory of Laser Materials Processing and Manufacturing School of Materials Science and Engineering Beihang University

This article examines fatigue crack nucleation and propagation in laser deposited TC18 titanium alloy. The Widmanstatten structure was obtained by double-annealing treatment,. High-cycle fatigue （HCF） tests were conducted at room temperature with the stress ratio of 0.1 and the notch concentration factor Kt = 1. Fatigue cracks initiated preferentially at micropores, which had great effect on the HCF properties. The effect decreased with the decrease of pore size and the increase of distance from the pore location to the specimen surface. The crack initiation region was characterized by the cleavage facets of a lamella and the tearing of β matrix. The soft a precipitated-free zone formed along grain boundaries accelerated the crack propagation. Subsurface observation indicated that the crack preferred to propagate along the grain boundary α or border of a lamella or vertical to a lamella.

关键词： titanium alloys fatigue crack initiation crack propagation laser melting deposition

Patterns of species diversity and its determinants in a temperate deciduous broad-leaved forest

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Forest Ecosystems 2022年第5期9卷 647-656页

作者： Rui He Man Hu Hang Shi quan Zhou Xiao shu Kerong zhang quanfa zhang Haishan Dang Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan430074China University of Chinese Academy of Sciences Beijing100049China

Biodiversity conservation has long been a subject of extreme interest to community ecologists,with a particular focus on exploring the underlying causes of species diversity based on niche and neutral theories.This study aims to identify the potential determinants of species diversity in a deciduous broad-leaved forest in the transitional region from subtropical to temperate climate in China.We collected woody plant data and environmental variables in a fully mapped 25-ha permanent forest plot,partitioned the beta-diversity into local contributions(LCBD)and species contributions(SCBD),and then applied multivariate linear regression analysis to test the effects of biotic and abiotic factors on alpha-diversity,LCBD,and SCBD.We used variation partitioning in combination with environmental variables and spatial distance to determine the contribution of environment-related variations versus spatial variations.Our results showed that the indices of alpha-diversity(i.e.,species abundance and richness)were positively correlated with soil available phosphorus(P)and negatively with slope.For the betadiversity,environment and space together explained nearly half of the variations in community composition.Approximately 60%of the variation of LCBD in the understory layer,40%in the substory layer,and 29%in the canopy layer were jointly explained by topographic,soil and biological variables,with biotic factors playing a dominant role in determining the beta-diversity.Species abundance accounted for a large proportion of the variations in SCBD in each vertical stratum,and niche position(NP)was the ecological trait that significantly affected the variations in SCBD in the substory and canopy layers.Our findings help to gain better understanding on how species diversity in forest ecosystem responds to environmental conditions and how it is influenced by biotic factors and ecological traits of species.

关键词： Alpha-diversity Beta-diversity Vertical strata Multivariate linear regression

Repetitive magnetic stimulation affects the microenvironment of nerve regeneration and evoked potentials after spinal cord injury

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Neural Regeneration Research 2016年第5期11卷 816-822页

作者： Jin-lan Jiang Xu-dong Guo Shu-quan Zhang Xin-gang Wang Shi-feng Wu Scientific Research Center China-Japan Union Hospital Jilin University Department of Orthopedics China-Japan Union Hospital Jilin University Department of Cardiovascular Medicine China-Japan Union Hospital Jilin University Department of Orthopedics Tianjin Nankai Hospital Department of Burns and Plastic Surgery China-Japan Union Hospital Jilin University

Repetitive magnetic stimulation has been shown to alter local blood flow of the brain, excite the corticospinal tract and muscle, and induce motor function recovery. We established a rat model of acute spinal cord injury using the modified Allen＇s method. After 4 hours of injury, rat models received repetitive magnetic stimulation, with a stimulus intensity of 35% maximum output intensity, 5-Hz frequency, 5 seconds for each sequence, and an interval of 2 minutes. This was repeated for a total of 10 sequences, once a day, 5 days in a week, for 2 consecutive weeks. After repetitive magnetic stimulation, the number of apoptotic cells decreased, matrix metalloproteinase 9/2 gene and protein expression decreased, nestin expression increased, somatosensory and motor-evoked potentials recovered, and motor function recovered in the injured spinal cord. These findings confirm that repetitive magnetic stimulation of the spinal cord improved the microenvironment of neural regeneration, reduced neuronal apoptosis, and induced neuroprotective and repair effects on the injured spinal cord.

关键词： nerve regeneration spinal cord injury repetitive magnetic stimulation motor function rats rehabilitation plasticity regenerative microenvironment neural regeneration

Associations of Daytime Napping with Incident Cardiovascular Diseases and Hypertension in Chinese Adults:A Nationwide Cohort Study

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Biomedical and Environmental Sciences 2022年第1期35卷 22-34页

作者： WANG Lu WANG Ke LIU Lin Jiong zhang Yuan Yuan shu Hai Nan WANG Kai ZHOU Pei Xuan zhang Yun quan Department of Nursing Medical CollegeWuhan University of Science and TechnologyWuhan 430065HubeiChina Department of Epidemiology and Biostatistics School of Public HealthWuhan University of Science and TechnologyWuhan 430065HubeiChina Hubei Province Key Laboratory of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065HubeiChina

Objective This study aimed to examine the associations of daytime napping with incident risks of cardiovascular diseases(CVDs)and hypertension(HTN).Methods Data for napping and CVD outcomes in 25 provinces were collected from baseline(2010)and three waves of follow-up(2012-2017)investigations of the China Family Panel Studies.Cox frailty models with random intercepts for the surveyed provinces were used to assess the longitudinal effects of daytime napping on CVD and HTN.Results Compared with non-nappers,30+min nappers had higher risks of CVD and HTN,while no significant associations were observed among<30 min nappers.Incident risks among 30-to<60-min nappers increased by 22%[hazard ratio(HR)1.22,95% confidence interval(CI)1.08-1.39]for CVD and 21%(1.21,1.04-1.41)for HTN,respectively,with corresponding HRs of CVD and HTN of 1.27(1.09-1.47)and 1.38(1.16-1.65)among≥60 min nappers.Nap-associated CVD risks varied by subgroups,with stronger associations in participants with lower body mass index(<24 kg/m^(2)),physically inactive persons,smokers,and participants with longer nighttime sleep(≥7 h/night).Significant effects of daytime napping were observed on rural and northern residents only,highlighting great regional variations in CVD risks associated with napping habits.Conclusions This cohort study revealed strong evidence that long daytime napping(≥30 min)is associated with an increased incidence of cardiovascular events.

关键词： Daytime napping Cardiovascular disease Hypertension Adults Sleep duration

A Novel Two-Nucleotide Deletion of MMADHC Gene Causing cblD Disease in a Chinese Family

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Chinese Medical Journal 2018年第20期131卷 2477-2479页

作者： Chao Wang Yu-Qin zhang shu-Hong zhang Ying-Tao Meng shu-Xiang Lin Chun-quan Cai Jian-Bo shu Department of Genetics Tianjin Pediatric Research Institute Tianjin Children's Hospital Tianjin 300134 China Department of Neurology Tianjin Children's Hospital Tianjin 300134 China Department of Gastroenterology Tianjin Children's Hospital Tianjin 300134 China Department of Neurosurgery Tianjin Children's Hospital Tianjin 300134 China

To the Editor： Vitamin B 12 （cobalamin, Cbl） is essential for normal growth and development in humans. It can be converted into two important active coenzymes, namely adenosyl cobalamin （AdoCbl） and methyJ cobala...

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