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Structural characteristics,anticoagulant and antithrombotic mechanism of a novel polysaccharide from Rosa Chinensis Flos

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Food Science and Human Wellness 2023年第2期12卷 407-415页

作者： Xiaofeng Zhang zhenhua liang Geoffrey Ivan Neil Waterhouse Shengjun Jiang Dongxiao Sun-Waterhouse Jinmei Wang Changyang Ma Wenyi Kang National R&D Center for Edible Fungus Processing Technology Henan UniversityKaifeng 475004China Joint International Research Laboratory of Food&Medicine Resource Function Henan ProvinceKaifeng 475004China School of Chemical Sciences University of AucklandAuckland 1142New Zealand Kaifeng Key Laboratory of Functional Components in Health Food Kaifeng 475004China

This is the first report on a polysaccharide(RCJ2-Ib)isolated from Rosa Chinensis ***2-Ib was obtained through the extraction with water,precipitation with ethanol,separation with DEAE-52 column and purification with DEAE-Sepharose Fast Flow column and Sephadex G100 ***,FT-IR and NMR analyses revealed that RCJ2-Ib(3.3 k Da)was a 1,4-linked polymannuronic acid containing substantialβ-Danomers *** anticoagulant effect of RCJ2-Ib evaluated by using rabbit ear venous blood and an acute blood stasis rat model showed that RCJ2-Ib had obvious anticoagulant activity in regulating endogenous and exogenous coagulation pathways and reducing serum thromboxane B2 and *** addition,RCJ2-Ib could also increase the number of Lactobacillus and Escherichia *** a result,RCJ2-Ib has the potential to inhibit thrombosis and maintain the intestinal environment.

关键词： Rosa Chinensis Flos Polysaccharide isolation Antithrombotic activity Intestinal flora

Heralded entanglement between error-protected logical qubits for fault-tolerant distributed quantum computing

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 25-33页

作者： Jialun Li Zhihao Xie Yachen Li Yansen liang zhenhua Li Tao Li MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of PhysicsNanjing University of Science and TechnologyNanjing 210094China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Quantum error correction is essential for achieving reliable quantum information processing tasks,as it can mitigate the detrimental effects of noise by encoding single-qubit information into a larger quantum ***,the generation of distributed entanglement between logical qubits located within two spatially separated nodes presents a significant resource-intensive challenge that has yet to be *** we present a heralded protocol for generating distributed entanglement between two nonlocal error-protected logical qubits.A high-dimensional single photon can evolve physical qubits into a logical qubit that entangles with the photon and then converts logical qubit-photon entanglement into entanglement between two logical qubits,when the photon state is properly tuned and an effective photon-spin interface between single photons and individual spins is ***,the success of the entanglement generation is heralded by the detection of the photon,and the corresponding efficiency can,in principle,approach *** distinguished features make our protocol highly appealing for future large-scale quantum technologies.

关键词： quantum networks distributed entanglement error-protected logical qubits high-dimensional photons

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佛山市成年居民骨密度CT定量研究

CT理论与应用研究（中英文） 2024年第2期33卷 213-220页

作者：吴伟智方挺松梁振华祝翠玲周静仪佛山市中医院放射科广东佛山528000

目的:研究佛山地区成年人椎体骨密度(BMD)与性别、年龄的关系,探讨本地区不同年龄段BMD均值及各年龄段骨质疏松症(OP)的发病率。方法:对佛山市中医院2021年10月至2023年3月的1 065例(男性648例,女性417例)健康成年人体检者使用定量CT(Q... 详细信息

目的:研究佛山地区成年人椎体骨密度(BMD)与性别、年龄的关系,探讨本地区不同年龄段BMD均值及各年龄段骨质疏松症(OP)的发病率。方法:对佛山市中医院2021年10月至2023年3月的1 065例(男性648例,女性417例)健康成年人体检者使用定量CT(QCT)行椎体BMD检测,按年龄段进行分组;采用t检验和方差分析对不同性别、不同年龄段BMD值进行检验,采用χ2检验和相关分析对不同性别、不同年龄段的OP发病率进行分析。结果:20~29岁、30~39岁、40~49岁及60~69岁、70~79岁不同性别间的BMD差异均有统计学意义,女性BMD在青中年时期高于男性。在40~49岁、50~59岁、60~69岁、70~79岁男性组及30~39、40~49岁、50~59岁、60~69岁女性组中,同性别不同年龄段间的BMD值差异有统计学意义,且随年龄的增长呈下降趋势;同性别不同年龄段的OP发病率差异均有统计学意义,年龄与OP发病率呈正相关关系(r男=0.517,r女=0.636)。结论:佛山市健康成年人QCT测量的椎体BMD与性别、年龄相关,在20~29岁达到峰值,随年龄的增长而下降;从40~49岁开始,OP发病率在男性和女性中随着年龄的增长而增加。

关键词：定量CT 骨密度骨质疏松症相关性

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Strategies for constructing seven-membered rings:Applications in natural product synthesis

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Chinese Chemical Letters 2024年第6期35卷 53-70页

作者： Peng Chen Lijuan liang Yufei Zhu Zhimin Xing zhenhua Jia Teck-Peng Loh College of Advanced Interdisciplinary Science and Technology Henan University of TechnologyZhengzhou 450001China Division of Chemistry and Biological Chemistry School of Chemistry Chemical Engineeringand BiotechnologyNanyang Technological UniversitySingapore 637371Singapore Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Applied Organic Chemistry Department of ChemistryLanzhou UniversityLanzhou 730000China

The seven-membered ring motifs are found in bioactive pharmaceuticals and a wide range of natural products,including alkaloids and terpenoids,which hold significant importance in synthetic chemistry and has garnered considerable attention from both academia and *** the challenges faced in the past decade,the total synthesis of natural products incorporating the non-aromatic cycloheptane skeletons remains a compelling ***,numerous elegant strategies for constructing the sevenmembered ring system have been successfully *** review focuses on the recent advancements in this field from 2017 to April 2023,highlighting key transformations utilized to construct the non-aromatic cycloheptane core structures and serves as a valuable guide for synthetic chemists engaged in the total synthesis of natural products containing seven-membered ring motifs.

关键词： Seven-membered rings Total synthesis Natural products Synthetic strategy Cycloheptane

Tuning microstructures of Mg-Ce-Ni hydrogen storage alloys via Cu and carbon nanotube additions

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Nano Research 2024年第8期17卷 7203-7211页

作者： Linlin Zhang liang Xiong Bingyang Gao Qingyun Shi Ying Wang Zhiya Han zhenhua Zhang Chunli Wang Limin Wang Yong Cheng State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Purification Equipment Research Institute of CSIC Handan 056002China

Mg-based alloys are regarded as highly promising materials for hydrogen *** significant improvements of the properties for Mg-based alloys,challenges such as slow hydrogen absorption/desorption kinetics and high thermodynamic stability continue to limit their practical *** this study,to assess hydrogen storage alloys with enhanced properties,incorporating both internal microstructure modulation through the preparation of amorphous/nanocrystalline structures and surface property enhancement with the addition of Cu and carbon nanotubes(CNTs),the kinetic properties of activation and hydrogenation,thermodynamic properties,and dehydrogenation kinetics are *** results reveal a complementary interaction between the added Cu and CNTs,contributing to the superior hydrogen storage performance observed in sample 7A-2Cu-1CNTs with an amorphous/nanocrystalline structure compared to the other experimental ***,the samples are fully activated after the initial hydrogen absorption and desorption cycle,demonstrating outstanding hydrogenation kinetics under both high and low temperature experimental *** noteworthy is that the hydrogen absorption exceeds 1.8 wt.% within one hour at 333 ***,the activation energy for dehydrogenation is decreased to 64.71 kJ·mol^(–1).This research may offer novel insights for the design of new-type Mg-based hydrogen storage alloys,which possess milder conditions for hydrogen absorption and desorption.

关键词： Mg-Ni-Ce alloy hydrogen storage amorphous/nanocrystalline structure kinetics Cu and carbon nanotubes(CNTs)codoping

THE KINETICS OF CHARGE-ACCUMULATING PROCESS ON THE SURFACE OF PHOTOCONDUCTIVE COATING FILM

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Chinese Journal of Polymer Science 1985年第3期3卷 258-264页

作者：陈德文徐愉梁振华 Institute of Chemistry Academia Sinica Beijing

The charge-accumulating process of polymeric photoconductive coating film used in electro-photography as well as factors controlling the charging rate have been studied, and the characteriza-tion of charging process a... 详细信息

关键词： THE KINETICS OF CHARGE-ACCUMULATING PROCESS ON THE SURFACE OF PHOTOCONDUCTIVE COATING FILM rate TNF

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桄榔粉的开发现状及研究进展

农产品加工 2024年第5期 88-92页

作者：黄洁津兰秀覃杰凤杨海霞马仙花李恒锐梁振华黄小娟广西南亚热带农业科学研究所广西崇左532415

桄榔粉是一种药食同源的特色食物,具有低脂、低热能、高纤维等特点,随着生活水平的不断提高,人们对桄榔粉的需求越来越大。桄榔粉也因其多种功能特性而被各界研究学者关注,在国内取得一定研究进展,但人们对桄榔粉的了解仍有欠缺。因此,... 详细信息

桄榔粉是一种药食同源的特色食物,具有低脂、低热能、高纤维等特点,随着生活水平的不断提高,人们对桄榔粉的需求越来越大。桄榔粉也因其多种功能特性而被各界研究学者关注,在国内取得一定研究进展,但人们对桄榔粉的了解仍有欠缺。因此,从桄榔粉的开采及研究现状、桄榔粉的食用和药用价值、成分分析等进行详细介绍,阐述桄榔种质资源的研究进展及目前桄榔开发存在的问题,为桄榔粉的开发利用和桄榔的可持续发展提供理论基础。

关键词：桄榔粉研究现状营养价值问题对策

从“盲点”到“盲从”--当代文学书写中的都市文化经验

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南方文坛 2008年第1期 38-42页

作者：梁振华北京师范大学文学院讲师

德国历史哲学家奥斯瓦尔德·斯宾格勒（Oswald Spengler）曾这样写道：“一切伟大的文化都是市镇文化，这是一件结论性的事实”，“世界历史是市民的历史，这就是‘世界历史’的真正标准，这种标准把它非常鲜明地同人的历史区分开来。... 详细信息

德国历史哲学家奥斯瓦尔德·斯宾格勒（Oswald Spengler）曾这样写道：“一切伟大的文化都是市镇文化，这是一件结论性的事实”，“世界历史是市民的历史，这就是‘世界历史’的真正标准，这种标准把它非常鲜明地同人的历史区分开来。”在充分肯定市民文化在人类文明进程中不可取代之价值的前提下，他还尤其看重诞生于市镇的一种独有的文化精神的生长力量——“它一旦觉醒起来，

关键词：文化经验文学书写 “盲点” 都市德国历史世界历史市民文化斯宾格勒

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世纪之交中国文学影像化叙事的双向表征

山东社会科学 2006年第8期 33-38页

作者：梁振华北京师范大学文学院北京100875

在媒介变迁的历史语境下,影视对上世纪90年代以来中国文学的整体风貌和存在形态构成了强大冲击。影像化叙事,作为世纪之交中国文学影像化生存最显著的文本表现形态,呈现出双重价值趋向和文化表征:其一,通过借鉴影像思维,促进传统文学文... 详细信息

在媒介变迁的历史语境下,影视对上世纪90年代以来中国文学的整体风貌和存在形态构成了强大冲击。影像化叙事,作为世纪之交中国文学影像化生存最显著的文本表现形态,呈现出双重价值趋向和文化表征:其一,通过借鉴影像思维,促进传统文学文体形式之革新;其二,对影像符号资本与市场逻辑的趋附,导致小说文体的蚀伤或者异化。

关键词：世纪之交中国文学影像化叙事革新异化