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The stereocomplex Crystallites Improve the stability of Biodegradable Poly(L-lactic acid)/Poly(D-lactic acid) Melt-Blown Nonwovens

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CHINEsE JOURNAL OF POLYMER sCIENCE 2025年第2期43卷 368-379页

作者： Yu, Jin-shuo Huan, Yue-Wei Pan, Hong-Wei Liu, Zhi-Gang Zhao, Yan Tan, Zhi-Yong Bian, Jun-Jia Yang, hui-Li Zhang, hui-Liang Chinese Acad sci Changchun Inst Appl Chem Key Lab Polymer Ecomat Changchun 130022 Peoples R China Changchun Univ Technol Coll Mat & Engn Engn Res Ctr Synthet Resin & Special Fiber Sch Chem EngnMinist Educ Changchun 130012 Peoples R China shandong Fufeng Fermentat Co Ltd Linyi 276600 Shandong Peoples R China Jilin COFCO Biochem Co Ltd Natl Engn Res Ctr Corn Deep Proc Changchun 130033 Peoples R China

Poly(lactic acid) (PLA) is a biodegradable and eco-friendly polymer that is increasingly being incorporated into various applications in contemporary society. However, the limited stability of PLA-based products remains a significant challenge for their broader use in various applications. In this study, poly(L-lactic acid)(PLLA)/poly(D-lactic acid) (PDLA) melt-blown nonwovens were prepared by melt spinning. The structure, thermal properties, thermal stability, biodegradability and crystalline morphology of the melt-blown nonwovens were investigated. DsC and WAXD confirmed the formation of stereocomplex (sC) crystallites in the PLLA matrix. The storage modulus (G '), loss modulus (G ''), and complex viscosity (divided by eta*divided by) of the PLLA/PDLA blend increased with an increase in sC crystallite content. The thermal degradation temperatures of PLLA/PDLA melt-blown nonwovens increased with the incorporation of sC crystallites, and the maximum rate of decomposition increased to 385.5 degrees C, thus enhancing the thermal stability. Compared with neat PLLA melt-blown nonwovens, the hydrophobicity of PLLA/PDLA melt-blown nonwovens was improved, and WCA increased to 139.7 degrees. The sC crystallites were more resistant to degradation by proteinase k compared to neat PLLA. However, the degradation rate of PLLA/PDLA melt-blown nonwovens remained at a high level. This work provides an effective strategy to obtain high-performance PLLA melt-blown nonwovens.

关键词： PLLA PDLA Melt-blown nonwovens stereocomplex crystallites Thermal stability Enzymatic degradation

specific Heat Capacity and Coordination Number of Nano-Confined Transcritical Water

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Journal of Thermal science 2025年第02期 498-509页

作者： ZHANG Bowei JIANG kun ZHANG Jie JIN hui state key Laboratory of Multiphase Flow in Power Engineering(skLMF) Xi'an Jiaotong University

In the field of nano energy,investigating the specific heat capacity and coordination number of nano-confined water is highly significant for gaining a better understanding of the energy and microstructure of confined *** this work,we employed the method of molecular dynamics（MD） simulation to calculate the specific heat capacity at constant volume and coordination number of water molecules confined in carbon nanotubes（CNTs） under different conditions（T=600-700 k,P=21.776 and 25 MPa,CNT diameter=0.949-5.017nm）.The results showed that near the critical point,the specific heat capacity at constant volume of confined water was lower than that of bulk water,and the energy fluctuation showed a trend of first increasing and then remaining unchanged with the increase of temperature and CNT *** them,the saturation point of temperature is 650 k（reduced pressure Pr=1） and 660 k（Pr=1.15）,and the saturation point of CNT diameter is 2.034 ***,the pseudo-critical temperature of confined water was the same as bulk water,and it increased with the increase of critical ***,with the increase of CNT diameter,the coordination number of confined water increased rapidly,and reaches the saturation state when the CNT diameter is 2.034 *** investigation revealed the mass and energy characteristics of nano-confined water near the critical point,which could provide guidance for the critical phase transition of nano-confined water.

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Effects of Chlorine-Based Fertilizers on Tomato Growth under soilless Culture

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Phyton-International Journal of Experimental Botany 2025年第1期94卷 243-250页

作者： Fei Li Meili Ding hui Yuan siping Wang Bin Liang College of Agriculture and Forestry Technology Weifang Vocational CollegeWeifang262737China College of Resources and Environment Qingdao Agricultural UniversityQingdao266109China

This study investigated the effects of chlorine-based fertilizers under varying nitrogen solution concentrations in a soilless culture system. The experiment included four nitrogen solution concentration levels, with nitrogen concentrations of 6 mmol/L (C1), 12 mmol/L (C2), 18 mmol/L (C3), and 24 mmol/L (C4). Each nutrient concentration level was further divided into four chloride ion treatments (R1, R2, R3, and R4), where 100%, 60%, 33%, and 0% of the NH4+ and k+ ions were derived from NH4Cl and kCl, respectively. The length, surface area and volume of root were significantly higher by 25.3%~136.9%, 40.1%~173.1%, 27.9%~178.0%, respectively, in the R4 treatment than in the R1 and R2 treatments at flowering stage. The aboveground biomass and yield in the R4 treatment were significantly higher, by approximately 15.6%~43.5% and 16.6%~28.6%, respectively, than in the R1, R2, and R3 treatments at the picking stage. The C3 and C4 treatments significantly decreased biomass and yield by 31.9%~50.2% and 20.7%~50.5%, respectively, compared to the C1 and C2 treatments at the picking stage. Besides, the higher nutrient solution increased the incidence of blossom-end rot. In conclusion, high concentrations of chloride ions in nutrient solutions, especially when the Cl− concentration exceeded 10 mmol/L, have been shown to inhibit tomato growth in soilless culture systems. Therefore, replacing sulfur-based fertilizers by chlorine-based fertilizers is not recommended for tomato production under the studied conditions.

关键词： sand culture chloride ion nitrogen solution concentration tomato yield blossom-end rot

stem-leaf saponins of Panax notoginseng attenuate experimental Parkinson's disease progression in mice by inhibiting microglia-mediated neuroinflammation via P2Y2R/PI3k/AkT/NFκB signaling pathway

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Chinese Journal of Natural Medicines 2025年第1期23卷 43-53页

作者： hui Wu Chenyang Ni Yu Zhang Yingying song Longchan Liu Fei Huang Hailian shi Zhengtao Wang Xiaojun Wu shanghai key Laboratory of Compound Chinese Medicines The Ministry of Education (MOE) Key Laboratory for Standardization of Chinese Medicines Institute of Chinese Materia Medica The MOE Innovation Centre for Basic Medicine Research on Qi-Blood TCM Theories Shanghai University of Traditional Chinese Medicine

stem-leaf saponins from Panax notoginseng(sLsP) comprise numerous PPD-type saponins with diverse pharmacological properties; however, their role in Parkinson's disease(PD),characterized by microglia-mediated neuroinflammation, remains unclear. This study evaluated the effects of sLsP on suppressing microglia-driven neuroinflammation in experimental PD models, including the 1-methyl-4-phenylpyridinium(MPTP)-induced mouse model and lipopolysaccharide(LPs)-stimulated BV-2 microglia. Our findings revealed that sLsP mitigated behavioral impairments and excessive microglial activation in models of PD, including MPTP-treated mice. Additionally, sLsP inhibited the upregulation of inducible nitric oxide synthase(i NOs) and cyclooxygenase-2(COX2) and attenuated the phosphorylation of PI3k,protein kinase B(AkT), nuclear factor-κB(NFκB), and inhibitor of NFκB protein α(IκBα) both in vivo and in vitro. Moreover, sLsP suppressed the production of inflammatory markers such as interleukin(IL)-1β, IL-6, and tumor necrosis factor alpha(TNF-α) in LPs-stimulated BV-2cells. Notably, the P2Y2R agonist partially reversed the inhibitory effects of sLsP in LPstreated BV-2 cells. These results suggest that sLsP inhibit microglia-mediated neuroinflammation in experimental PD models, likely through the P2Y2R/PI3k/AkT/NFκB signaling pathway. These novel findings indicate that sLsP may offer therapeutic potential for PD by attenuating microglia-mediated neuroinflammation.

关键词： Microglia NFκB Neuroinflammation P2Y2 receptor stem-leaf saponins of Panax Notoginseng

Pharmacological Mechanism of Chinese Medicine in systemic Lupus Erythematosus:A Narrative Review

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Chinese Journal of Integrative Medicine 2025年第2期31卷 157-169页

作者： ZHU Bo-yu LIU Zhi-chao ZHAO Zhen-xi HUANG hui-ping ZHANG Na XIA Jia CHEN Wei-wei Department of Rheumatology Shanghai Municipal Hospital of Traditional Chinese MedicineShanghai University of Traditional Chinese MedicineShanghai(200071)China

systemic lupus erythematosus(sLE)is a chronic autoimmune disorder affecting multiple systems,characterized by the development of harmful autoantibodies and immune complexes that lead to damage in organs and *** medicine(CM)plays a role in mitigating complications,enhancing treatment effectiveness,and reducing toxicity of concurrent medications,and ensuring a safe ***,CM mainly solves the disease comprehensively through multi-target and multi-channel regulation process,therefore,its treatment mechanism is often complicated,involving many molecular *** review introduces the research progress of pathogenesis of sLE from the aspects of genetics,epigenetics,innate immunity and acquired immunity,and then discusses the molecular mechanism and target of single Chinese herbal medicine and prescription that are commonly used and effective in clinic to treat sLE.

关键词： systemic lupus erythematosus Chinese medicine natural extracts treatment review

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Genesis of geothermal water in the hinterland of Guanzhong Basin， China: Insight from hydrochemical and isotopic analysis

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Journal of Earth science 2025年

作者： Jiangxia Wang Panpan Xu hui Qian Yongqi Zang Qiming Wang Zhiyuan Ma school of Water and Environment， Chang'an University key Laboratory of subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education， Chang'an University key Laboratory of Eco-hydrology and Water security in Arid and semi-arid Regions of Ministry of Water Resources， Chang'an University

The Guanzhong Basin， located in shaanxi Province， China， has abundant geothermal resources in its hinterland. Focusing on typical thermal reservoir structural units， namely the Xianli fault-step (XL) and Xi'an depression (XA)， this study reveals the genesis of geothermal water by combining hydrochemistry and environmental isotopes. The geothermal waters of XL uniformly correspond to the Na-Cl type with high contents of major ions， while the geothermal water of XA has complex hydrochemical types. The quartz geothermometer (with maximum steam loss) and Na-k-Ca geothermometer are recommended for XL and the quartz geothermometer (with no and maximum steam loss) and Na-k geothermometer for XA. Their temperature ranges are 99-159℃ and 93-146℃， respectively. The circulation depth of geofluids in XL and XA range from 2579 to 4766 m and from 2541 to 4330 m， with mean apparent ages of 21543 and 20345 yr B.P.， respectively. The geothermal water in XL originates from a mixture of sedimentary water and ancient infiltration water， and its formation mode was the vertical heat conduction with cooling process. In contrast， the geothermal water in XA originates from the dual process of cooling and mixing， with the process being dominated by ancient infiltration water and supplementation by modern infiltration water.

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Cereal-legume intercropping stimulates straw decomposition and promotes soil organic carbon stability

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science China Life sciences 2025年

作者： Wei Wang Meng-Ying Li Qing-hui Wen Yue Ma Zhi-Ming Zhang Muhammad Maqsood Ur Rehman Fei Mo Hong-Yan Tao Bao-Luo Ma Joann k.Whalen You-Cai Xiong state key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems College of Ecology Lanzhou University school of Ecology and Environmental science Yunnan University College of Agronomy Northwest A&F University Ottawa Research and Development Centre Agriculture and Agri-Food Canada Department of Natural Resource sciences McGill University

Increasing carbon（C） sequestration and stability in agricultural soils is a key strategy to mitigate climate change towards C neutrality. Crop diversification is an initiative to increase C sequestration in fields, but it is unclear how legume-based crop diversification impacts the functional components of soil organic carbon（sOC） in dryland, including the formation and transformation of particulate organic carbon（POC） and mineral-associated organic carbon（MAOC）. We investigated the decomposition of straw residues, the fate of photosynthesized C,as well as the formation of MAOC and POC fractions using an in situ13C labeling technique in the soybean-wheat intercropping, soybeanmaize intercropping and their respective monocropping systems, with and without cover crops. After 4-year treatments, the total sOC content in bulk soil remained unchanged, while MAOC content increased significantly by 5.6% with intercropping. Moreover, the in situ13C labeling results confirmed that more photosynthesized C was transferred to MAOC, and less was retained in the POC fraction. Intercropping significantly increased total soil N and mineral N content by 15.3% and 13.4%, respectively, and decreased soil and microbial C/N ratio by11.3% and 17.4%, respectively. This outcome, therefore, relieved microbial N limitation and accelerated straw residue ***, the potential of MAOC formation was strengthened for better sOC persistence. Our study suggests that legume-based crop diversification can effectively enrich N and support POC transformation to MAOC, accordingly contributing to the persistent sOC pool and thus potentially achieving C neutrality under climate change in dryland agroecosystems.

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Pronounced impact of size and shape effects on creep rupture life of a k439B superalloy combustion chamber casting simulator

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China Foundry 2025年

作者： Wen-tong Liu Yi-dong Wu Lei Gao Jing-yang Chen Cheng-bo Xiao Xi-dong hui state key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing science and Technology on Advanced High Temperature structural Materials Laboratory Beijing Institute of Aeronautical Materials

The size and shape effect(ssE) of components has become a critical issue for mechanical properties, application reliability, and processing. In this study, the creep rupture life(CRL) of components with different wall thicknesses and positions in a combustion chamber casing simulator made of k439B superalloy was investigated. The intrinsic mechanisms of the ssE were explored from the dendrite structure, volume fraction and size of the γ' phase, and element segregation, etc. It is shown that this casting exhibits a strong ssE of creep rupture life, characterized by a significant difference in the CRL values up to 60% with the variation of wall thickness and position in the casing. In terms of casting technology, the influence of ssE on CRL is actually determined by the cooling rate. The ssE on the creep rupture life originates from the dendrite structure(such as the secondary dendrite arm spacing), volume fraction size of the γ' phase in the dendrite trunk, and elements segregation rate. This work may have implications for the design and application of engineering components with large sizes and complex structures.

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官话方言知庄章组读音类型及演变的三个阶段

古汉语研究 2025年第1期 14-29,126页

作者：石慧南京师范大学文学院江苏东南京210097

文章将官话方言知庄章组的读音归纳为五种主要分合类型,据五种分合类型的历史来源及演变,可将官话方言知庄章组的历时演变归纳为三个阶段:1)中唐以后庄组三等字在南北音出现i介音脱落与保留两种演变方向,进而形成宋元时期南北音知庄章... 详细信息

文章将官话方言知庄章组的读音归纳为五种主要分合类型,据五种分合类型的历史来源及演变,可将官话方言知庄章组的历时演变归纳为三个阶段:1)中唐以后庄组三等字在南北音出现i介音脱落与保留两种演变方向,进而形成宋元时期南北音知庄章组两种分合模式;2)元以后北音进一步演变为合一型,开口知二庄与知三章对立型,知二庄与知三章对立型;南音演变为庄组二分型,以上四种类型基本奠定了现代官话方言知庄章组的读音;3)明清以后部分方言在以上四种类型基础上演变为新的类型,如开合口对立型。此外,知庄章组的历时演变一定程度反映了官话方言的亲疏关系以及近代官话的分化情况。

关键词：官话方言知庄章组近代官话