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Tough Polymeric Hydrogels Based on Amino Acid Derivative Mediated Dynamic Metal Coordination Bonds

Chinese Journal of Polymer Science 2024年第10期42卷 1578-1588,I0014页

作者： meng Li meng-yuan zhang Wu-Xuan Lei Zhu-Ting Lv Qing-Hua Shang Zheng Zhao Jiang-Tao Li Yi-Long Cheng Engineering Research Center of Energy Storage Materials and Devices Ministry of EducationSchool of ChemistryXi’an Jiaotong UniversityXi’an710049China Polymer Materials&Engineering Department School of Materials Science&Engineering Chang’an UniversityXi’an710064China School of Electrical Engineering Xi’an Jiaotong UniversityXi’an710049China Department of Nuclear Medicine the First Affiliated Hospital of ChinaXi’an Jiaotong UniversityXi’an710049China

Abstract The development of physically crosslinked hydrogels with excellent mechanical and sensing properties is of importance for expanding the practical applications of intelligent soft hydrogel ***,after copolymerization of hydroxyl-containing amino acid derivative N-acryloyl serine(ASer)with acrylamide(AM),we introduce Zr4+through an immersion strategy to construct metal ion-toughened non-covalent crosslinked hydrogels(with tensile strength of up to 5.73 MPa).It is found that the synergistic coordination of hydroxyl and carboxyl groups with Zr^(4+)substantially increases the crosslinking density of the hydrogels,thereby imparting markedly superior mechanical properties compared to hydroxyl-free Zr^(4+)-crosslinked hydrogels,such as N-acryloyl alanine(AAla)copolymerized with AM hydrogels(with tensile strength of 2.98 MPa)Through the adjustment of the composition of the copolymer and the density of coordination bonds,the mechanical properties of the hydrogels can be modulated over a wide ***,due to the introduction of metal ions and the dynamic nature of coordination bonds,the hydrogels also exhibit excellent sensing performance and good self-recovery properties,paving the way for the development of flexible electronic substrates with outstanding comprehensive performances.

关键词： Hydrogel Amino acid Metal coordination Mechanical performance Flexible sensor

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Development and validation of a nomogram for predicting the probability of serious complication in esophageal cancer patients after esophagectomy

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Journal of Nutritional Oncology 2024年第1期9卷 17-24页

作者： Fei-Fei Chong Zhen-Yu Huo meng-yuan zhang Xiu-Mei He Si-Yu Luo Jie Liu Department of Clinical Nutrition Daping HospitalArmy Medical University(The Third Military Medical University)Chongqing 400042China Chongqing Municipal Health Commission Key Laboratory of Intelligent Clinical Nutrition and Transformation Chongqing 400042China and 3Department of Clinical Nutrition The Thirteenth People’s Hospital of ChongqingChongqing 400053China

Background:Esophagectomy remains a procedure with one of the highest complication *** study aimed to develop and validate a model of nomogram for predicting the probability serious postoperative complications for the postoperative esophageal cancer(EC)***:An observational study was conducted at Daping Hospital,China,encompassing 529 postoperative EC patients from December 2014 to November *** independent prognostic factors to craft a predictivemodel,specifically a nomogram,designed to forecast the risk of severe postoperative ***:The incidence of serious complications for postoperative EC patients was 58.1%.A total of seven variables,including age,gender,bleeding volume during the operation(P=0.035),operating time(P=0.031),the Nutritional Risk Screening 2002(NRS 2002)score(P=0.027),the perioperative nutrition screen(PONS)score(P=0.018),and cystatin C levels(P<0.001),were applied to draw the nomogram of predicting serious complications after *** accuracy of predictive value for the model was quantified by Harrell’s C index at 0.690(95%confidence interval=0.596-0.785,P<0.001).Conclusion:We developed a nomogram system to demonstrate exceptional predictive capabilities for postoperative EC patients in forecasting the risk of serious *** results also emphasize the predictive value of the preoperative nutritional risk screening with NRS 2002 and PONS in EC patients undergoing esophagectomy.

关键词： Esophageal cancer Esophagectomy Postoperative complication NRS 2002 Perioperative nutrition screen

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Effect of tadalafil in chronic renal failure rabbits:relevance to erectile dysfunction

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第6期12卷 455-459页

作者： meng-yuan zhang Qiang FU Wei BIAN Department of Urology Provincial Hospital Affiliated to Shandong University Jinan 250021 China

It is of great importance to investigate an effective and reliable medication against chronic renal failure (CRF)-related erectile dysfunction (ED),which aims to improve patients' life *** concentrations of cyclic guanosine monophosphate (cGMP) in the corpus cavernosal smooth muscle of both CRF and control rabbits were *** effects of various concentrations of tadalafil,papaverine,and sodium nitroprusside on the relaxation responses of corpus cavernosal smooth muscle pre-contracted with phenylephrine in CRF rabbits were *** was significant difference in the concentration of cGMP between CRF and control rabbits (P<0.01).Tadalafil had the greatest impacts on CRF rabbits when given the same concentration of papaverine or sodium nitroprusside and particularly significant differences were identified under the concentration levels of 10-5 and 10-4 mol/L (P<0.01).The results suggest that the cGMP concentrations of the corpus cavernosum had been greatly reduced in CRF rabbits compared with control rabbits and that tadalafil may be an ideal medication for use in the treatment of CRF-related ED.

关键词： Chronic renal failure Erectile dysfunction Phosphodiesterase inhibitor Tadalafil

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Structure and Morphology of Poly(ε-caprolactone)Heterogeneous Shish-Kebab Structure Induced by Poly(lactic acid)Nanofibers

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Chinese Journal of Polymer Science 2022年第10期40卷 1223-1232,I0009页

作者： Zhong-Hua Chang Dong-Fang Wang Yi-Yang Xu meng-yuan zhang Qian Li School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China National Center for International Research of Micro-Nano Molding Technology Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

In recent years,the hybrid shish-kebab structure with excellent physical properties and functionalities has attracted much attention because it provides a way of blending nanofibers with different properties into polymer matrix in a regular *** is often not easy to induce the formation of the hierarchically ordered structure for the semi-crystalline polymer in heterogeneous shish-kebab structure.A poly(lactic acid)(PLA)/poly(ε-caprolactone)(PCL)heterogeneous shish-kebab structure,i.e.,the PCL crystals periodically crystallized onto PLA nanofibers,was successfully created and the interfacial crystal morphology of the PLA/PCL heterogeneous shish-kebab structure was observed using scanning electron microscopy and atomic force *** aqueous solution was applied to modify the surface of the PLA nanofibers to produce adsorption sites and carboxyl *** total reflectance Fourier transform infrared spectroscopy(ATR-FTIR)and X-ray diffraction(XRD)results demonstrated that the formation of the heterogeneous shish-kebab structure was mainly due to the hydrogen bonding interaction between the kebab and shish interface,and the growth process of the kebab crystals also promoted the crystallization of the shish *** heterogeneous nanostructure of biodegradable polymers will have great applications in tissue engineering and regenerative medicine.

关键词： Shish-kebab structure PCL PLA Crystallization Surface modification

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Intraoperative systemic vascular resistance is associated with postoperative nausea and vomiting after laparoscopic hysterectomy

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World Journal of Clinical Cases 2020年第20期8卷 4816-4825页

作者： meng-Di Qu meng-yuan zhang Gong-Ming Wang Zhun Wang Xu Wang Department of Anesthesiology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina

BACKGROUND The incidence of postoperative nausea and vomiting(PONV)in patients undergoing laparoscopic hysterectomy is very high compared with other surgeries,even when many prophylactic measures have been ***,the pathogenesis of PONV is *** sex,a history of motion sickness or PONV,nonsmokers,and perioperative opioid use are the most closely related *** the multiple risk factors,suboptimal gastrointestinal(GI)perfusion may be attributed to some cases of PONV,and increased systemic vascular resistance(SVR)may lead to GI *** hypothesis of this research was that SVR is related to *** To investigate the relationship between SVR and PONV in patients undergoing laparoscopic *** A total of 228 patients who underwent elective laparoscopic hysterectomy were included in this prospective observational *** was monitored using a noninvasive hemodynamic monitoring *** indices of SVR,the baseline,mean,area under the curve(AUC),and weighted AUC,were used for *** incidence and severity of nausea and vomiting were evaluated while patients were awake and throughout the intervals from 0 to 2 h,2 to 6 h,and 6 to 24 h starting upon arrival at the post-anesthesia care *** associations between various SVR indices and PONV were investigated by logistic regression.P<0.05 was considered statistically *** The incidence of PONV in the study was 56.14%(128/228),and PONV tended to appear within 6 h after *** variables were significant in univariate analyses,however,only SVR mean[odds ratio(OR)=1.015,95%CI:1.005-1.109,P=0.047]and duration of surgery(OR=1.316,95%CI:1.003-2.030,P=0.012)were associated with PONV after logistic regression ***,patients with high SVR mean were more likely to suffer from PONV after laparoscopic *** average,patients who developed PONV needed more time to tolerate diet and demonstrated poorer sleep quality on the first night

关键词： Postoperative nausea and vomiting Systemic vascular resistance Gastrointestinal perfusion Laparoscopic hysterectomy Prospective observational study Pneumoperitoneum

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Flow characteristics and regime transition of aqueous foams in porous media over a wide range of quality,velocity,and surfactant concentration

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Petroleum Science 2023年第2期20卷 1044-1052页

作者： Bin-Fei Li meng-yuan zhang Zhao-Min Li Anthony Kovscek Yan Xin Bo-Liang Li Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Department of Energy Resources Engineering Stanford UniversityStanfordCA94305USA

Aqueous foam is broadly applicable to enhanced oil recovery(EOR).The rheology of foam as a function of foam quality,gas and liquid velocities,and surfactant concentration constitute the foundation of its *** great variations of the above factors can affect the effectiveness of N2 foam in EOR continuously in complex formations,which is rarely involved in previous relevant *** paper presents an experimental study of foam flow in porous media by injecting pre-generated N2 foam into a sand pack under the conditions of considering a wide range of gas and liquid velocities and surfactant *** results show that in a wide range of gas and liquid velocities,the pressure gradient contours are L-shaped near the coordinate axes,but V-shaped in other *** the surfactant concentration is a strong factor influencing the trend of pressure gradient *** flow resistance is very sensitive to the surfactant concentration in both the high-and low-foam quality regime,especially when the surfactant concentration is less than *** foam quality is an important variable to the flow resistance *** exists a transition point from low-to high-quality regime in a particular flow system,where has the maximum flow resistance,the corresponding foam quality is called transition foam quality,which increases as the surfactant concentration *** results can add to our knowledge base of foam rheology in porous media,and can provide a strong basis for the field application of foams.

关键词： Foam flow regime and transition Porous media Pressure gradient Flow velocity Surfactant concentration Foam quality

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Enhanced potassium storage of carbon nanofibers as binderfree anodes enabled by coupling ultra-small amorphous Sb_(2)O_(3),graphene modification and sulfur doping

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Rare Metals 2024年第1期43卷 51-64页

作者： Zhao Huang Yu-Kang Lou Lin Peng yuan Peng meng-meng Wang Ming zhang College of Railway Transportation Hunan University of TechnologyZhuzhou 412007China College of Semiconductors(College of Integrated Circuits) Changsha Semiconductor Technology and Application Innovation Research InstituteHunan UniversityChangsha 410082China Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education College of Semiconductors(College of Integrated Circuits)Hunan UniversityChangsha 410082China

Considering the intrinsic advantages of natural copiousness and cost-effectiveness of potassium resource,potassium-ion batteries(KIBs) are booming as prospective alternatives to lithium-ion batteries(LIBs) in large-scale energy storage scenarios. Nevertheless, lacking desirable electrodes for reversibly hosting the bulky K+hinders the widespread application of KIBs, and it needs to be urgently solved. Hereon, the porous S-doped Sb_(2)O_(3)-graphene-carbon(SAGC) nanofibers are manufactured through an adjustable and facile approach, which involves electrospinning, in situ etching and sulfuration. The synthesized SAGC is featured by the ultra-small amorphous Sb_(2)O_(3) homogeneously wrapped inside the carbon matrix, as well as the co-incorporation of graphene and sulfur. Tentatively,the SAGC nanofiber sheets are applied as binder-free anodes for KIBs, exhibiting a prominent cycling life(256.72 m Ah·g^(-1) over 150 cycles at 100 m A·g^(-1)) and rate·g^(-1) over 100 cycles at 1 A·g^(-1)). The positive synergy among all the active components accounts for the distinguished performances of the SAGC. By reinforcing the tolerability to the swelling stress, producing the valid electrochemical active sites, and promoting the charge transferring for reversible K+uptake, the SAGC finally renders the excellent cyclability, capacity, and rate capability. Moreover, the extrinsic electrochemical pseudocapacitance characteristics induced by the porous carbon substrate elevate the K-storage capacity of the SAGC as well. It is hoped that the conclusions drawn may offer new insights into a direction for the high-performance binderfree KIB anodes.

关键词： S-doped Sb_(2)O_(3)-graphene-carbon Nanofibers Binder-free Anodes Potassium-ion batteries

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BDSec:Security Authentication Protocol for BeiDou-Ⅱ Civil Navigation Message

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China Communications 2024年第6期21卷 206-218页

作者： Wu Zhijun zhang yuan Yang Yiming Wang Peng Yue meng School of Safety Science and Engineering Civil Aviation University of ChinaTianjin 300300China School of Electronic Information and Automation Civil Aviation University of ChinaTianjin 300300China

Due to the lack of authentication mechanism in BeiDou navigation satellite system(BDS),BD-Ⅱ civil navigation message(BDⅡ-CNAV) are vulnerable to spoofing attack and replay *** solve this problem,we present a security authentication protocol,called as BDSec,which is designed by using China’s cryptography Shangyong Mima(SM) series algorithms,such as SM2/4/9 and Zu Chongzhi(ZUC)*** BDSec protocol,both of BDⅡ-CNAV and signature information are encrypted using the SM4 algorithm(Symmetric encryption mechanism).The encrypted result is used as the subject authentication *** protocol applies SM9 algorithm(Identity-based cryptography mechanism) to protect the integrity of the BDⅡ-CNAV,adopts the SM2 algorithm(Public key cryptosystem) to guarantee the confidentiality of the important session information,and uses the ZUC algorithm(Encryption and integrity algorithm) to verify the integrity of the message authentication serial number and initial information and the information in authentication initialization sub-protocol *** results of the SVO logic reasoning and performance analysis show that BDSec protocol meets security requirements for the dual user identity authentication in BDS and can realize the security authentication of BDⅡ-CNAV.

关键词： BDII civil navigation messages(BDIICNAV) BeiDou navigation satellite system(BDS) identity-based cryptography mechanism navigation message authentication protocol(BDSec)

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Characterization of a smog chamber for studying formation of gas-phase products and secondary organic aerosol

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Journal of Environmental Sciences 2024年第2期136卷 570-582页

作者： Qi yuan Zhuozhi zhang meng Wang Kin Fai Ho Tao Wang Shuncheng Lee Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina School of Public Health and Primary Care The Chinese University of Hong KongShatinHong KongChina

Smog chambers provide a potent approach to explore the secondary organic aerosol formation under varied *** study describes the construction and characterization of a new smog chamber facility for studying the formation mechanisms of gas-phase products and secondary organic aerosol from the photooxidation of volatile organic *** chamber is a 5.4 m^(3) Fluorinated Ethylene Propylene(FEP)Teflon reactor with the potential to perform photooxidation experiments at controlled temperature and relative *** characterizations were conducted for evaluation of stability of environmental parameters,mixing time,background contamination,light intensity,and wall losses of gases and *** photolysis rate of NO_(2)(J_(NO2))ranged from(1.02-3.32)×10^(-3)sec^(-1),comparable to the average J_(NO2)in ambient *** wall loss rates for NO,NO_(2),and O_(3)were 0.47×10^(-4),0.37×10^(-4),and 1.17×10^(-4)min^(-1),while wall loss of toluene was obsoletely found in a 6 hr *** particle number wall loss rates are(0.01-2.46)×10^(-3)min^(-1)for 40-350 nm with an average lifetime of more than one day.A series of toluene photooxidation experiments were carried out in absence of NO_xunder dry *** results of the simulation experiments demonstrated that the chamber is well designed to simulate photolysis progress in the atmosphere.

关键词： Smog chamber Gas-phase oxidation Chamber characterization Chemical mechanism

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Common Injuries and Repair Mechanisms in the Endothelial Lining

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Chinese Medical Journal 2018年第19期131卷 2338-2345页

作者： Ling-Bing meng Kun Chen yuan-meng zhang Tao Gong Department of Neurology Beijing Hospital National Center of Gerontology Beijing 100730 China National Center for Clinical Laboratories Beijing Hospital National Center of Gerontology Beijing 100730 China Department of Internal Medicine Jinzhou Medical University Jinzhou Liaoning 121001 China

Objective：Endothelial cells （ECs） are important metabolic and endocrinal organs which play a significant role in regulating vascular *** ECs,located between the blood and vascular tissues,can not only complete the metabolism of blood and interstitial fluid but also synthesize and secrete a variety of biologically active substances to maintain vascular tension and keep a normal flow of blood and long-term ***,this article presents a systematic review of common injuries and healing mechanisms for the vascular *** Sources：An extensive search in the PubMed database was undertaken,focusing on research published after 2003 with keywords including endothelium,vascular,wounds and injuries,and wound *** Selection：Several types of articles,including original studies and literature reviews,were identified and reviewed to summarize common injury and repair processes of the endothelial ***：Endothelial injury is closely related to the development of multiple cardiovascular and cerebrovascular ***,the mechanism of vascular endothelial injury is not fully *** studies have shown that the mechanisms of EC injury mainly involve inflammatory reactions,physical stimulation,chemical poisons,concurrency of related diseases,and molecular *** progenitor cells play an important role during the process of endothelial repair after such ***＇s more,a variety of restorative cells,changes in cytokines and molecules,chemical drugs,certain RNAs,regulation of blood pressure,and physical fitness training protect the endothelial lining by reducing the inducing factors,inhibiting inflammation and oxidative stress reactions,and delaying endothelial ***：ECs are always in the process of being *** therapeutic targets and drugs were seeked to protect the endothelium and promote repair.

关键词： Endothelium Vascular Wound Healing Wounds and lnjuries

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