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| 1 | Response of Pinus taiwanensis growth to climate changes at its southern limit of Daiyun Mountain, China's Mainland Fujian Province显示文摘The Pinus taiwanensis trees of a Chinese endemic species form pure forests at infertile sites in humid subtropical China, which can aid soil reservation and ecological resiliency at such sites. Herein, we used dendrochronological methods to investigate the growth patterns and their relationship with climate by analyzing 158 cores of 79 P. taiwanensis trees at 4 sites in their southernmost distribution in China's Mainland at Daiyun Mountain in Fujian Province. Tree growths at sites with favorable conditions generally showed an age-related growth trend, which decreased from approximately 5 mm to 0.5 mm in about a century. Trees in moderately stressed environments established high growth in their juvenile periods but were highly susceptible to environmental stresses such as a sharp growth decline in the 1990 s. The temperature in February and the moisture in July are the major limiting factors for most of the tree growths, except for a few extremely stressed P. taiwanensis trees. The growth of the dwarf P. taiwanensis trees, with all ring diameters of the first 20 years less than 4 mm, is mainly limited by the dry climate in May. Under the potential future warming trend, drought stress can be particularly threatening to these dwarf P. taiwanensis trees, which are likely to be the germplasm resources for this species in this region. | CHEN Dan FANG KeYan LI YingJun DONG ZhiPeng ZHANG Yu ZHOU FeiFei | 2016 | Science China Earth Sciences2016，59，2： | 6 |
| 2 | In-situ Synthesis and Characterization of Poly(vinyl alcohol)/Hydroxyapatite Composite Hydrogel by Freezing-thawing Method显示文摘Poly(vinyl alcohol)/hydroxyapatite(PVA/HA) composite hydrogel was successfully in-situ synthesized via three cycles of freezing-thawing. The composition and structure of products were investigated by X-ray diffraction( XRD), Fourier transformed infrared spectroscopy(FTIR) and scanning electron microscopy(SEM). The influence of different preparation methods and contents of material on the mechanical properties of PVA/HA composite hydrogel was discussed through tensile and compressive tests. The template of PVA could avoid the agglomeration of HA particles, which improves the mechanical properties of the composite hydrogel effectively. The tensile strength, modulus and compressive performances of the PVA/HA composite hydrogel prepared by the in-situ synthesis method were better than those of hydrogel obtained by the simple blend metliod. In addition, the effect of the content of PVA, HA, and the pH value on tlie properties of tlie PVA/HA composite hydrogel has been discussed in detail. | MENG Deyue ZHOU Xiuqing ZHENG Keyan MIAO Chong SHENG Ye ZOU Haifeng | 2019 | Chemical Research in Chinese Universities2019，35，3： | 3 |
| 3 | A Thermoregulatory Flexible Phase Change Nonwoven for All‑Season High‑Efficiency Wearable Thermal Management显示文摘Phase change materials have a key role for wearable thermal management,but suffer from poor water vapor permeability,low enthalpy value and weak shape stability caused by liquid phase leakage and intrinsic rigidity of solid–liquid phase change materials.Herein,we report for the first time a versatile strategy for designed assembly of high-enthalpy flexible phase change nonwovens(GB-PCN)by wet-spinning hybrid grapheneboron nitride(GB)fiber and subsequent impregnating paraffins(e.g.,eicosane,octadecane).As a result,our GB-PCN exhibited an unprecedented enthalpy value of 206.0 J g^(−1),excellent thermal reliability and anti-leakage capacity,superb thermal cycling ability of 97.6%after 1000 cycles,and ultrahigh water vapor permeability(close to the cotton),outperforming the reported PCM films and fibers to date.Notably,the wearable thermal management systems based on GB-PCN for both clothing and face mask were demonstrated,which can maintain the human body at a comfortable temperature range for a significantly long time.Therefore,our results demonstrate huge potential of GB-PCN for human-wearable passive thermal management in real scenarios. | Hanqing Liu Feng Zhou Xiaoyu Shi Keyan Sun Yan Kou Pratteek Das Yangeng Li Xinyu Zhang Srikanth Mateti Ying Chen Zhong‑Shuai Wu Quan Shi | 2023 | Nano-Micro Letters2023，15，2： | 1 |
| 4 | Preparation of Nanometric Particles of Aluminum Nitride by Pyrolysis of Diethylaluminun Azide显示文摘Thermal stabilities of diethylaluminum azide were studied by means of theoretical analysis and expriments.The results have shown that diethylaluminum and azid be heated to vigorous refluxing under vacuum(400 Pa) at temperature as high as 420℃ without incident of explosion and decomposes smoothly during 460 ~580℃ to form nanometric particles of aluminum nitride in the aerosol synthesis reactor. A new way of preparing nanometric parties of aluminum nitrideis found. | YE Yaping ZHOU Keyan GAO Thznxian SUN Yu LU Bingling(Applied Science School, USTB, Beijing 100083, China)(School of Chemical Engineering, Dalian University of Technology) | 1997 | International Journal of Minerals,Metallurgy and Materials1997，11，4： | 0 |
| 5 | miRNA-141-5p Affects the Levels of Neutrophil Elastase in Preeclampsia by Regulating MAPK1显示文摘Objective:The objective of this study was to investigate the expression levels of microRNA-141-5p(miRNA-141-5p),MAPK1 and neutrophil elastase in patients with and without preeclampsia(PE),and the relationship between miRNA-141-5p and MAPK1 with respect to the secretion of elastase by neutrophils in patients with PE.Methods:Thirty patients with PE and 30 healthy pregnant(HP)women were recruited from The Second Hospital of Shanxi Medical University,Taiyuan,China,between February 2017 and July 2018.Neutrophils were isolated from 8 mL peripheral blood samples and cultured.We recorded neutrophil count and morphology during culture.Apoptosis was detected by flow cytometry in different groups at 0,24,and 48 h.The expression levels of elastase were detected in neutrophils by enzyme-linked immunosorbent assay,whereas the expression levels of miRNA-141-5p in peripheral blood neutrophils were detected by real-time polymerase chain reaction.We used TargetScanHuman Release 7.2 to analyze the target genes of miRNA-141-5p.The expression of MAPK1 in peripheral blood neutrophils was detected by western blotting.Data were analyzed by SPSS version 21.0 software,and comparisons between groups were carried out with the Studentt test.Results:There was no significant difference between the PE and HP groups(P>0.050)with regard to age or body mass index.The weight of newborns in the PE group(2846.00±600.00 g)was significantly lower than that in the HP group(3055.00±230.68 g).The number of neutrophilic granulocytes(NGs)in blood samples from the PE group was significantly higher than that in the HP group(P=0.003).There was no significant difference between the groups with regard to morphology.Apoptosis in the PE group was delayed when compared with the HP group at different time points.TheP value of apoptosis in the PE and HP groups were respectively 0.790,<0.001 and 0.030 at 0 h,24 h and 48 h.The expression levels of miRNA-141-5p in the PE group were significantly lower than those in the HP group(P<0.050).The expression levels of MAPK1 in neutrophils from the PE group were significantly higher than those in the HP group(P<0.050)by western blot.The expression levels of elastase in neutrophils from the PE group were significantly higher than those in the HP group(P<0.050).Furthermore,the number of NGs in peripheral blood from the PE group was higher than that of the HP group;however,the levels of apoptosis were lower.The expression levels of miRNA-141-5p in NGs decreased,the expression of MAPK1 increased,and the secretion of neutrophil elastase in the NG medium increased in the PE group than those in the HP group.Conclusion:Collectively,our analysis suggested that miRNA-141-5p may be involved in the pathogenesis of PE by regulating the MAPK1 signaling pathway to activate neutrophils and increase the secretion of elastase. | Keyan Cheng Jialei Cui Wenli Zhou Huiqiang Liu Taotao Yang Yonghong Wang | 2022 | Maternal-Fetal Medicine2022，4，4： | 0 |
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