检索结果-南通市图书馆

Primary percutaneous coronary intervention in a COVID-19 patient with ST-segment elevation myocardial infarction after lung transplantation:a case report

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第5期21卷 411-415页

作者： tian-ming xuan Xing-xiang WANG Xiang-yuan PU Wei-li HAN Xiao-gang GUO Department of Cardiology the First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China Department of Lung Transplantation the First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China

本文首次报告了重症新型冠状病毒肺炎(COVID-19)感染接受肺移植并行急症冠脉介入治疗的病例。通过对多学科协作成功救治的总结,为重症COVID-19救治提供经验。我们发现,重症COVID-19感染在肺移植术后可能出现多种危险因素诱发心肌梗死,... 详细信息

本文首次报告了重症新型冠状病毒肺炎(COVID-19)感染接受肺移植并行急症冠脉介入治疗的病例。通过对多学科协作成功救治的总结,为重症COVID-19救治提供经验。我们发现,重症COVID-19感染在肺移植术后可能出现多种危险因素诱发心肌梗死,急症冠脉介入治疗是救治此类患者的重要手段。

关键词：新型冠状病毒肺炎(COVID-19) 肺移植心肌梗死冠脉介入治疗

Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Yuan tian Jiang-Bo Chen Jie Ying Ge tian Yu-xuan Xiao Yi Lu Si-ming Wu Wei Geng Ling Shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering and Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-Sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction （OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion （Cl–） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline （1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

关键词：

Cu^(2+)污染下农作物叶片特征光谱探究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2025年第1期45卷 264-271页

作者：张超吴轩杨可明齐钒宇夏天中国地质调查局发展研究中心北京100037 中国地质大学(北京)地球科学与资源学院北京100083 全国地质资料馆北京100037 中国矿业大学(北京)地球科学与测绘工程学院北京100083 中国资源卫星应用中心北京100094

为探究重金属胁迫下农作物污染响应的敏感叶型及谱段,设计了室外温室环境下的不同铜胁迫梯度玉米花盆试验。以玉米叶片为探究对象,利用仪器测定了出穂期玉米叶片的高光谱反射率数据以及叶片中重金属含量数据,为研究提供了基础数据。从... 详细信息

为探究重金属胁迫下农作物污染响应的敏感叶型及谱段,设计了室外温室环境下的不同铜胁迫梯度玉米花盆试验。以玉米叶片为探究对象,利用仪器测定了出穂期玉米叶片的高光谱反射率数据以及叶片中重金属含量数据,为研究提供了基础数据。从频率域角度,结合时频分析的方法设计了叶片光谱探测法(LSDM),获得了重金属铜胁迫下敏感叶型及谱段,为农作物重金属监测提供技术支撑。根据玉米的生长过程,从老叶(O)、中叶(M)、新叶(N)光谱350~1300 nm的全谱段和子谱段角度进行探究。(1)对铜胁迫下玉米叶片的高光谱反射率数据进行双微分(SOD)和包络线移除(CR),转换到频率域上,结合时频分析的方法进行Daubechies小波6层分解。(2)根据信号异常点、小波高值点和SODCR曲线高值点,定义玉米叶片的光谱异常参数(SAP)。异常变化反射率ACR(异常反射率与其后一个相邻波段反射率差值的绝对值);异常小波系数AWC(异常小波系数与其后一个相邻波段小波系数差值的绝对值);异常SODCR值ASV(异常点SODCR值与其后一个相邻波段SODCR值差值的绝对值)。通过光谱异常参数与玉米叶片重金属含量的相关关系,探究对铜污染响应敏感的叶型及谱段。结果表明,叶片光谱探测法LSDM能高效地对玉米叶片弱信息进行增强,并准确定位出重金属铜胁迫引起的光谱异常谱段位置,异常变化范围集中在350~800 nm内;光谱异常参数能定量地衡量玉米叶片在重金属铜胁迫下的光谱异常;在不同铜胁迫梯度下,玉米新叶(N)为敏感叶型,敏感谱段为蓝边、绿峰、黄边、红谷。该研究有望为其他谷类农作物及其冠层尺度重金属监测提供技术支撑。

关键词：重金属胁迫玉米叶片高光谱敏感叶型敏感谱段

Modular assembly of complex C-alkyl glycoside enabled via cooperative NHC and photoredox catalysis

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Rui-Qiang Jiao ming Li Xi Chen Mei-Ze Xu tian Ding Xiao-Ping Gong Zhuo-Mei Li Xue-Yuan Liu Yong-Min Liang State Key Laboratory of Applied Organic Chemistry Lanzhou University College of Chemistry and Chemical Engineering Northwest Normal University

C-Alkyl glycosides are found in natural products and are indispensable in drug development programs,owing to their diverse range of medicinal ***-component reactions involving glycosyl radical addition are well documented and proved efficient for the C-alkyl glycosides ***,multicomponent reactions for the rapid and controllable construction of structurally diversified C-alkyl glycosides in a single step remains a significant challenge due to the issues associated with balancing reactivity,compatibility,and ***,we report an NHC and photoredox co-catalyzed three-component method to access complex and valuable C-alkyl *** protocol exhibits broad substrate scope and excellent chemoand ***,nine types of sugars are compatible with this *** addition,the generality of this catalytic strategy was further highlighted by the potential for scalable production,the feasibility of further modifications of the products and its successful application in the late-stage functionalization of pharmaceutical skeletons.

关键词：

Facile Synthesis of Polyisothioureas via Alternating Copolymerization of Aziridines and Isothiocayanates

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第3期42卷 292-298,I0005页

作者： Hao-tian Zhang ming-Xin Niu Qi Zhang Chen-Yang Hu xuan Pang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Materials Science and Engineering Jilin UniversityChangchun 130025China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Isothiourea is an important class of sulfur-containing molecules showing unique catalytic and biological activities. As such,polyisothiourea is envisioned to be an interesting type of polymer that potentially exhibits a number of interesting properties. However, there is no access to synthesizing well-defined polyisothiourea, and currently isothiourea-containing polymers are mainly prepared by immobilizing onto other polymer's side chain. Herein, we report the first facile synthesis of polyisothioureas via alternating copolymerization of aziridines and isothiocayanates. Mediated by the catalytic system of phosphazene superbases/alcohol, a broad scope of aziridines and isothiocayanates could be transformed into polyisothioureas with adjustable substitutions(11 examples). The structures of obtained polyisothioureas were fully characterized with ^(1)H-NMR, ^(13)C-NMR, and ^(1)H-^(13)C HMBC NMR. Moreover, the polyisothioureas show tunable thermal properties depending on substitutions on the isothiourea linkages. The novel structure of these polyisothioureas will enable a powerful platform for the discovery of nextgeneration functional plastics.

关键词： Polyisothioureas Alternative copolymer Aziridines Isothiocayanates

Clinicopathologic Characteristics and Survival of Patients with Rare Malignant Ovarian Yolk Sac Tumors:A Population-based Analysis

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2021年第2期41卷 342-347页

作者： tian WANG Bo WANG Shi-xuan WANG ming-fu WU Deparment of Obstetrics and Gynecology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Yolk sac tumors (YSTs) are rare malignant germ cell tumors that usually affect youngfemales. To date, there have been few studies on YSTs. We evaluated the relationship betweenclinicopathologic characteristics of patients with ovarian YSTs and disease outcome based onSurveillance, Epidemiology, and End Results data. The K aplan-Meier method and log-rank testwere used to evaluate differences in survival rates. Data for 269 patients were analyzed. Theincidence of YSTs among ovarian germ cell tumors (OGCTs) cases was 0.4%;median patient agewas 22.0 years, and most tumors were unilateral. Patients presented with distant metastasis (37.5%),localized disease (49. 1%), and regional spread (8.9%). American Joint Committee on Cancer stagewas available for 13 patients (stage IA, n=2;stage IC, n=1;stage IA, n=1;stage IB, n=3;stageIlC, n=2;and stage IV, n=4). Survival rates at 1, 3, and 5 years were 91.0%, 84.0%, and 83.2%,respectively, for overall survival (OS) and 92.0%, 85.4%, and 84.5%, respectively, for disease-specific survival (DSS). The 5-year OS and DSS of patients with ovary tumors were 91.5% and92.9%, respectively, compared to 74.8% and 77.2%, respectively, for those with extra-ovarianspread (P50 years was associated with shorter OS and DSS(both P<0.001), whereas no associatios of OS and DSS were observed with pathologic grade (P=0.49for OS and 0.52 for DSS). In summary, YSTs are typically unilateral, of a high grade, and localizedto the ovary;extra-ovarian spread has a poor outcome, and postmenopausal women have worseprognosis than premenopausal women.

关键词： yolk sac tumor clinical characteristic prognosis SEER

Nonlinear Masking and Iterative Learning Decryption for Secure Communications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2015年第3期12卷 297-306页

作者： ming-xuan Sun College of Information Engineering Zhejiang University of Technology

Typical masking techniques adopted in the conventional secure communication schemes are the additive masking and modulation by multiplication. In order to enhance security, this paper presents a nonlinear masking methodology, applicable to the conventional schemes. In the proposed cryptographic scheme, the plaintext spans over a pre-specified finite-time interval, which is modulated through parameter modulation, and masked chaotically by a nonlinear mechanism. An efficient iterative learning algorithm is exploited for decryption, and the sufficient condition for convergence is derived, by which the learning gain can be chosen. Case studies are conducted to demonstrate the effectiveness of the proposed masking method.

关键词： Secure communication masking convergence learning algorithms nonlinearities.

Gastrointestinal involvement in systemic lupus erythematosus:Insight into pathogenesis, diagnosis and treatment

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第24期16卷 2971-2977页

作者： tian, Xin-Ping Zhang, xuan Chinese Acad Med Sci Peking Union Med Coll Peking Union Med Coll Hosp Dept Rheumatol Beijing 100730 Peoples R China

Systemic lupus erythematosus (SLE) is an autoimmune inflammatory disease characterized by the presence of a plethora of autoantibodies and immune complex formation. Virtually every system and organ can be affected by SLE. Gastrointestinal symptoms are com-mon in SLE patients, and more than half of them are caused by adverse reactions to medications and viral or bacterial infections. Though not as common as lu-pus nephritis, SLE-related gastrointestinal involvement is clinically important because most cases can be life-threatening if not treated promptly. Lupus mesenteric vasculitis is the most common cause, followed by pro-tein-losing enteropathy, intestinal pseudo-obstruction, acute pancreatitis and other rare complications such as celiac disease, inflammatory bowel diseases, etc. No specific autoantibody is identified as being associated with SLE-related gastroenteropathy. Imaging studies, particularly abdominal computed tomography scans, are helpful in diagnosing some SLE-related gastroen-teropathies. Most of these complications have good therapeutic responses to corticosteroids and immu-nosuppressive agents. Supportive measures such as bowel rest, nutritional support, antibiotics and proki-netic medications are helpful in facilitating functional recovery and improving the outcome.

关键词： Systemic lupus erythematosus Systemic Vasculitis Gastroenteropathy

Reversible Mechanochemistry Enabled Autonomous Sustaining of Robustness of Polymers—An Example of Next Generation Self-healing Strategy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第5期39卷 545-553,I0005页

作者： ming-xuan Li Min-Zhi Rong ming-Qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Guangdong Provincial Key Laboratory of High Performance Polymer CompositesSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Even under low external force,a few macromolecules of a polymer have to be much more highly stressed and fractured first due to the inherent heterogeneous *** the materials keep on working under loading,as is often the case,the minor damages would add up,endangering the safety of *** we show an innovative solution based on mechanochemically initiated reversible cascading variation of metal-ligand *** loading,crosslinking density of the proof-of-concept metallopolymer networks autonomously increases,and recovers after ***,the stress-induced tiny fracture precursors are blocked to grow and then *** entire processes reversibly proceed free of manual intervention and *** proposed molecular-level internal equilibrium prevention mechanisms fundamentally enhance durability of polymers in service.

关键词： Metal-ligand complexations Polyurethane Mechanochemistry Mechanical properties Robustness