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Characterization of Leaf-Inspired Microfluidic Chips for Pumpless Fluid Transport

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Journal of Bionic Engineering 2014年第1期11卷 109-114页

作者： Jiankang He mao mao Dichen Li Yaxiong Liu Zhongmin Jin State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi 'an 710049 P. R. China

Microfluidic networks are extensively used in miniaturized lab-on-a-chip systems. However, most of the existing micro- channels are simply designed and the corresponding microfluidic systems commonly require external pumps to achieve effec- tive fluid transport. Here we employed microfabrication techniques to replicate naturally-optimized leaf venations into synthetic hydrogels for the fabrication of pumpless microfluidic chips. The unique properties of leaf-inspired microfluidic network in convectively transporting fluid were characterized at different inclination angles. Flow velocity inside these microfluidic net- works was quantitatively measured with Particle Image Velocimetry （PIV）. Mass diffusion from biomimetic microfluidic network to surrounding bulk hydrogels was investigated. The results demonstrate that the leaf-inspired microfluidic network can not only effectively transport fluid without the use of external pumps, but also facilitate rapid mass diffusion within bulk hy- drogel chips. These leaf-inspired microfluidic networks could be potentially used to engineer complex pumpless or- gan-on-a-chip systems.

关键词： leaf-inspired microfluidic network pumpless lab-on-a-chip system biomimetics

Dynamic steric confinement effect expands the frontier of Cu-catalyzed asymmetric propargylic aminations

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Science China Chemistry 2024年第10期67卷 3181-3183页

作者： Peng Chen mao-mao Zhang Wen-Jing Xiao Liang-Qiu Lu Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079China Wuhan Institute of Photochemistry and Technology Wuhan 430082China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics(LICP)Chinese Academy of SciencesLanzhou 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Chiralα-tertiary amines and related azacycles are commonly found in many natural products,pharmaceuticals and agrochemicals[1].Copper-catalyzed asymmetric propargylic amination(APA)reactions have been established as a reliable method to access enantio-enriched propargylic amines,largely due to the seminal contribution of Nishibayashi et al.[2]and van Maarseveen et al.[3]in 2008.

关键词： catalyzed asymmetric amines

Pyrolysis-GC/MS of Menthyl Esters of N-Benzoxycarbonyl Amino Acid

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Chemical Research in Chinese Universities 2010年第2期26卷 198-203页

作者： mao mao GU Cheng-zhi YIN Hao SONG Qin-hua LI Qlan-rong Hefei National Laboratory for Physical Sciences at Microscale Department of Chemistry University of Science and Technology of China Hefei 230026 R R. China Department of Chemistry Shihezi University Shihezi 832003 P. R. China

With the aid of a Pyrolysis-GC/TOF MS technique, the pyrolysis behaviour of two menthyl esters of N-benzoxycarbonyl amino acid was investigated. A clear pattern emerges involving the cleavage of the bond linking the menthyl ring to the carboxy group, followed by further degradation of the fragments. The major pyroproducts were p-menth-l-ene pyrolysed at a higher temperature or p-menth-2-ene pyrolysed at a lower temperature, and various derivatives of cyclohexene pyrolyzed from the menthyl ring. In addition, some of the products were also iden- tified as derivatives of benzene from the pyrolysis of benzyloxyl moiety.

关键词： Menthyl esters of N-benzoxycarbonyl amino acid Py-GC/MS Pyrolysis

Investigation of stressful life events in patients with systemic sclerosis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第11期9卷 853-856页

作者： Yue CHEN Ji-zhong HUANG Yu QIANG Jin WANG mao-mao HAN Department of Geriatrics the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Department of Surgery Hangzhou Tongji Hospital Hangzhou 310012 China

Objective: To assess the occurrence of stressful life events in the year before the initiation of systemic sclerosis. Methods: A consecutive series of 40 patients with systemic sclerosis (mean age (56.3±11.9) years, mean disease duration (4.3±3.1) years; 32 females and 8 males), including 28 with diffuse cutaneous scleroderma and 12 with limited cutaneous scleroderma, were evaluated. A control group of 40 healthy subjects free of systemic sclerosis also was included. Socioeconomic status was inves- tigated and Paykel's interview for recent life events (a semi-structured research interview covering 64 life events) was conducted. Results: Patients with systemic sclerosis showed higher percentages of lower education (72.5%) and working class (82.5%), and reported more stressful life events (P<0.05), such as exits (P<0.05), undesirable events (P<0.01), and uncontrolled events (P<0.001), when compared with the control. More events that had an objective negative impact (P<0.001) were also reported in systemic sclerosis patients than in the control. These results are in accordance with a multifactorial model of pathogenesis in systemic sclerosis. Conclusion: We reported a strong relationship between stressful life events and the initiation of systemic sclerosis. Our findings are consistent with current understanding of the extensive links of behavioral responses to stress with neurophysiological and biochemical processes.

关键词： Systemic sclerosis (SSc) Life events Stress Pathogenesis

Advanced biofabrication strategies for biomimetic composite scaffolds to regenerate ligament-bone interface

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Biosurface and Biotribology 2021年第4期7卷 187-205页

作者： Nan Jiang mao mao Xiao Li Weijie Zhang Jiankang He Dichen Li State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’anShaanxiChina Department of Surgical Oncology Shaanxi Provincial People’s Hospital(Third Hospital of Medical College of Xi’an Jiaotong University)Xi’anShaanxiChina NMPA Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi’an Jiaotong UniversityXi’anShaanxiChina Department of Knee Joint Surgery Hong Hui HospitalHealth Science CenterXi’an Jiaotong UniversityXi’anShaanxiChina

The natural ligament-bone interface features gradient changes in matrix composition,architecture and cell phenotype,which play critical roles in reliable ligament fixation and smooth loading *** such organisations in artificial composite tissue-engineering scaffolds is important for realising functional fixation between ligament implants and host ***,the authors aim to provide a comprehensive review on the latest strategies to fabricate biomimetic composite scaffolds for the regeneration of ligament-to-bone *** biomimetic composite scaffolds are divided into stratified and gradient scaffolds,which are characterised as layer-specific and continuous changes,respectively,in scaffold materials and/or *** strategies for different types of composite scaffolds are *** effects of material/structural changes on cellular morphology,cell differentiation,in vivo osteointegration and multi-tissue interface regeneration are ***,the potential challenges and future perspectives in engineering biomimetic composite scaffolds for ligament-bone interface regeneration are discussed.

关键词： biofabrication biomimetic composite scaffolds gradient scaffolds ligament stratified scaffolds

Construction of a few-layer g-C_3N_4/α-MoO_3 nanoneedles all-solid-state Z-scheme photocatalytic system for photocatalytic degradation

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Journal of Energy Chemistry 2019年第2期28卷 65-71页

作者： Xiaoni Zhang Jianjian Yi Hanxiang Chen mao mao Liang Liu Xiaojie She Haiyan Ji Xiangyang Wu Shouqi Yuan Hui Xu Huaming Li School of the Environment and Safety Engineering Institute for Energy ResearchJiangsu University

The suppression of the recombination of electrons and holes(e–h) and the enhancement of the light absorption of semiconductors are two key points toward efficient photocatalytic ***,we report a few-layer g-C_3N_4/α-MoO_3 nanoneedles(flg-C_3N_4/α-MoO_3 NNs) all-solid-state Z-scheme mechanism photocatalyst synthesized via a typical hydrothermal method in a controlled *** recombination of the photo-induced e–h pairs could be effectively restrained by the Z-scheme passageway between the flg-C_3N_4 and α-MoO_3 NNs in the composite,which could also promise a high redox ability to degrade *** it became possible for the prepared photocatalyst to absorb light in a wide range of *** detailed mechanism was studied by electron spin-resonance spectroscopy(ESR).The low-dimensional nanostructure of the two constituents(α-MoO_3 NNs with one-dimensional structure and flg-C_3N_4 with two-dimensional structure) endowed the composite with varieties of excellent physicochemical properties,which facilitated the transfer and diffusion of the photoelectrons and increased the specific surface area and the active *** 10 wt% flg-C_3N_4/α-MoO_3 NNs showed the best photocatalytic performance toward RhB degradation,the rate of which was 71.86%,～2.6 times higher than that ofα-MoO_3 NNs.

关键词： Flg-C3N4 α-MoO3 nanoneedles All-solid-state Z-scheme mechanism Low-dimensional nanostructure Photocatalytic degradation

Does delaying ureteral stent placement lead to higher rates of preoperative acute pyelonephritis during pregnancy?

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World Journal of Clinical Cases 2022年第3期10卷 802-810页

作者： mao-mao He Xiao-Ting Lin Ming Lei Xiao-Lan Xu Zhi-Hui He Department of Obstetrics and Gynecology The First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510120Guangdong ProvinceChina Department of Urology The First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510120Guangdong ProvinceChina

BACKGROUND Pregnancy with renal colic may cause pyelonephritis,decreased renal function,systemic infection and even shock in pregnant women,and cause premature birth and other adverse pregnancy *** surgery is necessary,the relationship between timing of the operation and the outcome of the mother and child are not *** To investigate the association between time to ureteral stent placement and clinical outcomes of patients with renal colic during *** In this retrospective study,pregnant women with renal colic who underwent surgery were *** preoperative acute pyelonephritis(PANP),pregnancy outcome,and length of hospital stay(LOS)were compared between the two *** 100 patients were included in the analysis,median age was 30 *** time to ureteral stent placement was 48 h(interquartile range,25-96 h),and 32 patients(32%)were diagnosed with *** was closely related to hospitalization costs,re-admission to the hospital due to urinary tract infection after surgery and premature *** analysis found that stone location and time from pain to admission were related to *** Both early and delayed surgery are safe and effective for the treatment of renal colic during *** surgery may be superior to a delayed procedure due to shorter *** pregnant patients with renal colic,delayed surgery within 48 h is not related to the clinical outcome of the mother and ***,the time from pain to hospital admission was related to PANP.

关键词： Renal colic Ureteral stent placement Acute pyelonephritis Pregnancy

The effects of maltodextrin/starch in soy protein isolate–wheat gluten on the thermal stability of high-moisture extrudates

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Journal of Integrative Agriculture 2023年第5期22卷 1590-1602页

作者： XIE Si-han WANG Zhao-jun HE Zhi-yong ZENG mao-mao QIN Fang Benu ADHIKARI CHEN Jie State Key Laboratory of Food Science and Technology Jiangnan UniversityWuxi 214122P.R.China Collaborative Innovation Center of Food Safety and Quality Control Jiangnan UniversityWuxi 214122P.R.China Analysis Centre Jiangnan UniversityWuxi 214122P.R.China School of Science RMIT UniversityMelbourneVIC 3083Australia

This study aimed to investigate the interaction between maltodextrin/starch of different molecular weight distributions and soy protein isolate (SPI)–wheat gluten (WG) matrix during high-moisture *** maltodextrins (dextrose equivalent (DE):10 and 20) and wheat starch were extruded with SPI–WG blend in a system of 65,70,and 75%moisture to investigate their effects on texture and thermal *** 5%maltodextrin (DE10) in the SPI–WG matrix improved the fiber structure and thermal *** wheat starch was thoroughly gelatinized during subsequent sterilization,the fiber structure and thermal stability were also *** was found that the plasticization caused by small-molecular weight saccharides and enhanced phase separation caused by large-molecular weight saccharides changed the melting temperature of blends and significantly improved the texture and thermal stability of extrudates.

关键词： high-moisture extrusion protein saccharide fiber structure textural properties rheology plasticization phase separation

3D printing in space:from mechanical structures to living tissues

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International Journal of Extreme Manufacturing 2024年第2期6卷 378-387页

作者： mao mao Zijie Meng Xinxin Huang Hui Zhu Lei Wang Xiaoyong Tian Jiankang He Dichen Li Bingheng Lu State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China National Medical Products Administration(NMPA)Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China National Innovation Platform(Center)for Industry-Education Integration of Medical Technology Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China National Innovation Institute of Additive Manufacturing Xi’an 710000People’s Republic of China

3D printing stands at the forefront of transforming space exploration,offering unprecedented on-demand and rapid manufacturing *** adeptly addresses challenges such as mass reduction,intricate component fabrication,and resource *** the obstacles posed by microgravity and extreme environments,continual advancements underscore the pivotal role of 3D printing in aerospace *** its primary function of producing space structures,3D printing contributes significantly to progress in electronics,biomedicine,and resource *** perspective delves into the technological advantages,environmental challenges,development status,and opportunities of 3D printing in *** its crucial impact,we anticipate that 3D printing will unlock innovative solutions,reshape manufacturing practices,and foster self-sufficiency in future space endeavors.

关键词： 3D printing in space space manufacturing microgravity