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Reversibly enhanced aqueous solubilization of volatile organic compounds using a redox-reversible surfactant

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Journal of Environmental Sciences 2011年第9期23卷 1486-1490页

作者： Yingjie li Senlin tian hong Mo Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650093 China

Surfactant-enhanced remediation （SER） is an effective method for the removal of volatile organic compounds （VOCs） from contaminated soils and *** reuse the surfactant the VOCs must be separated from the surfactant *** water solubility of VOCs can be enhanced using reversible surfactants with a redox-acive group,（ferrocenylmethyl）dodecyldimethylammonium bromide （Fc12） and （ferrocenylmethyl）tetradecanedimethylammonium bromide （Fc14）,above and below their critical micelle concentrations （CMC） under reducing （I ＋） and oxidative （I 2＋） *** CMC values of Fc12 and Fc14 in I ＋ are 0.94 and 0.56 mmol/L and the solubilization of toluene by Fc12 and Fc14 in I ＋ for toluene is higher than the solubilization achieved with sodium dodecyl sulfate,cetyltrimethylammonium bromide and Trition *** solubilization capacity of the ferrocenyl surfactants for each tested VOCs ranked as follows： ethylbenzene toluene *** solubilities of VOCs by reversible surfactant in I ＋ were 30% higher than those in I 2＋ at comparable surfactant *** effects of Fc14 concentrations on VOCs removal efficiency were as follows： benzene toluene ***,an improved removal efficiency was achieved at low ferrocenyl surfactant ***,the reversible surfactant could be recycled through chemical approaches to remove organic pollutants,which could significantly reduce the operating costs of SER technology.

关键词： ferrocenyl surfactant reversibility solubility VOCs

Leaf Responses of Micropropagated Apple Plants to Water Stress:Changes in Endogenous Hormones and Their Influence on Carbohydrate Metabolism

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Agricultural Sciences in China 2007年第1期6卷 58-67页

作者： li tian-hong li Shao-hua Department of Fruit Science College of Agronomy and Biotechnology China Agricultural University Beijing 100094 P.R.China Institute of Botany Chinese Academy of Sciences Beijing 100093 P.R. China

The changes in the concentrations of endogenous hormones and their influence on carbohydrate metabolism in leaves of micropropagated Fuji apple plants were studied under water deficiency stress. The results showed that water stress induced a rapid increase in the concentration of abscisic acid （ABA） and led to a decrease in concentrations of both zeatin and gibberellins （GAs）. The concentration of indole-3-acetic acid （IAA） changed in an independent manner, which was not correlated with the different levels of water stress. With regard to the carbohydrates, the contents of sorbitol and sucrose increased, whereas the content of starch decreased. The increase in the concentration of ABA was significantly correlated with both the increase in the activity of aldose-6-phosphate reductase （A6PR） and the decrease in the activity of sorbitol dehydrogenase （SDH）, indicating that ABA played a regulatory role in sorbitol metabolism. The concentration of ABA was positively correlated to the activity of sucrose-phosphate synthase （SPS） but negatively correlated to the activities of acid invertase （AI） and ADP-glucose-pyrophosphorylase （ADPGppase） in water-stressed plants, which indicated that ABA promoted sucrose synthesis and inhibited sucrose degradation and starch synthesis at the same time. Under conditions of water stress, the decrease in the level of zeatin was accompanied by a decrease in the activities of SDH and ADPGPPase. GAs concentration showed positive correlation with ADPGPPase activity. IAA showed no significant correlation with any of the enzymes tested in this study. The results of this study suggested that ABA might be one of the key factors regulating the distribution of carbohydrates under water stress. The metabolism of sorbitol and starch under conditions of water stress might be regulated by the combined action of many plant hormones.

关键词： micropropagated apple plants water stress enzyme activity hormone correlation analysis

Effect and Functional Mechanism of the Action of Exogenous Gibberellin on Flowering of Peach

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Agricultural Sciences in China 2008年第11期7卷 1324-1332页

作者： AN li-jun JIN liang YANG Chun-qin li tian-hong Department of Fruit Science College of Agronomy and Biotechnology China Agricultural University Beijing 100193 P.R. China

This study was conducted to assess the effect of gibberellin and its possible mechanism of action on peach flower formation. At flower induction, 100 mg L^-1 of gibberellic acid 3 （GA3） was sprayed on the leaves of peach [Prunus persica （L.） Batsch.] cv. Bayuecui. Using anatomy, immunohistochemistry, and semi-quantitation, the in situ distribution of GAs and the expression of the key genes involved in peach flower formation in the apical meristem were studied during flowering differentiation. The results showed that induction of flowering in the Bayuecui peach occurred prior to 10 July in Beijing, China. Flower induction and further differentiation of the peach flower organs were significantly inhibited by leaf-spraying of GA3 at a concentration of 100 mg L^-1 during the induction stage. The flowering rate was only 11.67% after treatment. The distribution of GA1 in the apical meristem varied during the process of flower bud differentiation. From 13 June to 25 July, the GA1 signal from control plants was detected mainly in the vascular bundles at the base of the flower buds. No GA1 signal was detected in the apical meristem. After treatment with GA3, the distribution was similar to that of the control from 13 June to 3 July. On 13 July, a GA1 signal was detected in the apical meristem accompanied by an increase in the GA1 signal in the vascular bundles at the base of the flower buds. The GA1 signal weakened significantly in both the vascular bundles and the apical meristem on 25 July. The expression of the genes PpLEAFY and MADS6 in flower buds could be detected only on 10 October in the GA3-treated plants. The critical period for flower induction of Bayuecui peach in Beijing was in early July, during which time, leaf-spraying with 100 mg L-1 GA3 could effectively inhibit flower induction and further differentiation of the flower buds. GA1 in the gibberellin family was the suppressor for flower induction in peach. Its action was affected by the stage of flower bud di

关键词： peach [Prunus persica (L.) Batsch.] gibberellin flowering induction anatomy immunohistochemistry semiquantitation RT-PCR

Impact of Mo/Ni alloying on microstructural modulation and low-temperature toughness of high-strength low-alloy steel

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Journal of Iron and Steel Research International 2024年第7期31卷 1746-1762页

作者： Wei liu hong-li Zhao Bing-xing Wang Yong tian State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The high-strength low-alloy steel plates with varying Ni/Mo contents were manufactured using the thermos-mechanical control *** investigation was conducted to explore the effect of Ni/Mo microalloying on microstructure evolution and mechanical properties of the *** results revealed that the increase in Ni content from 1 to 2 wt.%reduced the transition temperature of ferrite and the growth range of ferritic grain was narrowed,which promoted grain *** optimized combination of grain size,high-angle grain boundaries(HAGBs),and martensite-austenite(M-A)islands parameter contributed to the excellent impact toughness of S1 steel at-100℃(impact absorbed energy of 218.2 J at-100℃).As the Mo increases from 0 to 2 wt.%,the matrix structure changes from multiphase structure to granular bainite,which increases the average effective grain size to~4.62 pm and reduces HAGBs proportion to~36.22%.With these changes,the low-temperature impact toughness of S3 steel is *** addition,based on the analysis of the characteristics of crack propagation path,it was found that M-A islands with low content(~2.21%)and small size(~1.76 pm)significantly retarded crack propagation,and the fracture model of M-A islands with different morphologies was further ***,correlation between behaviour of delamination and toughness was further analysed by observing delamination size and impact energy parameters.

关键词： High-strength low-alloy steel Microstructural regulation Ni addition Mo addition Crack propagation Low-temperature toughness

Brucellosis of unknown origin with haemophagocytic syndrome:A case report

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World Journal of Clinical Cases 2021年第15期9卷 3649-3654页

作者： li-hong tian Zhi-Gao Dong Xu-Yan Chen lian-Jiang Huang Ping-Ping Xiao Department of Hematology and Rheumatology The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina Department of Laboratory The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina

BACKGROUND Brucellosis is a contagious bacterial disease caused by Brucella species,which is a leading zoonotic disease *** patients with brucellosis have a clear infection source;however,our case had a rare presentation of secondary haemophagocytic lymphohistiocytosis without any epidemiological *** SUMMARY A 50-year-old man was admitted to our hospital with a fever of unknown *** laboratory examinations,such as blood culture and bone marrow biopsy,the patient was diagnosed with brucellosis and secondary haemophagocytic *** antibiotic therapy,the patient was afebrile,and his haemogram recovered to normal,after which he was *** Brucellosis cannot be excluded in patients with clinically unexplained fever,even in those without epidemiologic history.

关键词： Brucella Brucellosis Haemophagocytic syndrome Haemophagocytic lymphohistiocytosis Fever Case report

A study of the effect of local scour on the flow field near the spur dike

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 98-105页

作者： Yu-tian li Jie-Min Zhan Wing-hong Onyx Wai Department of Industrial Design School of Industrial Design and Ceramic ArtFoshan UniversityFoshan 528000China Department of Applied Mechanics and Engineering Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

The flow field near a spur dike such as down flow and horseshoe vortex system(HVS)are susceptible to the topographic changes in the local scouring process,resulting in variation of the sediment transport with *** this study,large eddy simulations with fixed-bed at different scouring stages were conducted to investigate the changes in flow *** results imply that the bed deformation leads to an increase in flow rate per unit area,which represent the capability of sediment transportation by water,in the scour ***,the intensity of turbulent kinetic energy and bimodal motion near the sand bed induced by the HVS were also ***,the peak moments between the two sediment transport mechanisms were ***,understanding the complex feedback mechanism between topography and flow field is essential for the local scour problem.

关键词： Spur dike Local scour Large eddy simulation Down flow Horseshoe vortex system

Melamine Nephrotoxicity is Mediated by Hyperuricemia

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Biomedical and Environmental Sciences 2015年第12期28卷 904-912页

作者： ZHANG Long li hong tian WANG lin lin TRACHTMAN Howard TRASANDE Leonardo WANG Pei Xin liU Jian Meng Institute of Reproductive and Child Health/Ministry of Health Key Laboratory of Reproductive Health Peking University Health Science Center Department of Epidemiology and Health Statistics School of Public HealthPeking University Health Science Center Departments of Pediatrics Environmental Medicine and Population HealthNew York University School of Medicine NYU Wagner School of Public Service NYU Steinhardt School of Culture Education and Human Development

Objective We tested whether melamine nephrotoxicity was exacerbated by urate(a typical component of renal stones in humans)in rats with hyperuricemiainduced by the uricase inhibitor,potassium oxonate(Oxo).Methods Rats were exposed to melamine or Oxo alone or combinations of melamine(200-400 mg/kg)and Oxo(200-600 mg/kg)for 3 consecutive *** injury was evaluated by renal biochemical functions,histomorphology,and lipid *** crystals were analyzed for their *** Nephrotoxicity was minimal in animals administered melamine or Oxo alone,but it was demonstrable in animals administered at least 800 mg/kg of the two compounds *** rats in the 400+600(melamine+Oxo)and 400+400 mg/kg groups and 4 out of 6 in the 200+600 mg/kg group died within 3 days;no rat died in the 200+400 or 200+200 mg/kg ***-dependent renal damage resembling clinical findings in affected patients was observed in rats administered the two *** composition determination revealed the existence of melamine and uric acid in the affected kidneys,resembling human *** Our findings suggest that uric acid plays a key role in melamine-related kidney injury in *** studies should consider uric acid together with melamine when examining adverse effects in humans.

关键词： Melamine Nephrotoxicity Hyperuricemia Urolithiasis

Harmonic State Space Based Impedance Modeling and Virtual Impedance Based Stability Enhancement Control for LCC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 287-298页

作者： Yifeng liu Xiaoping Zhou Quan Chen Hanhang Yin Lerong hong Hao tian Ying Chen Siyuan li the College of Electrical and Information Engineering Hunan UniversityChangsha 410082China the Zhejiang Magtron Intelligent Technology limited Cooperation Jiaxing 314000China the State Grid Qianjiang Electric Power Company Qianjiang 433100China

line commutated converter based high-voltage direct-current(LCC-HVDC)transmissions are prone to harmonic oscillation under weak *** modeling is an effective method for assessing interaction ***,this paper proposes an improved calculation method for the DC voltage and AC currents of commutation stations to address the complex linearization of the commutation process and constructs an overall harmonic state-space(HSS)model of an *** on the HSS model,the closed-loop AC impedances on the LCC-HVDC sending and receiving ends are then derived and *** impedance characteristics of the LCC-HVDC are then analyzed to provide a physical explanation for the harmonic oscillation of the *** effects of the grid strength and control parameters on system stability are also *** improve the impedance characteristics and operating stability of the LCC-HVDC system,a virtual impedance based stability enhancement control is proposed,and a parameter design method is considered to ensure satisfactory phase margins at both the sending and receiving ***,simulation results are presented to verify the validity of the impedance model and virtual impedance based stability enhancement control.

关键词： line commutated converter based high-voltage direct-current(LCC-HVDC)transmission harmonic state space stability analysis harmonic oscillation virtual impedance

Exogeneous metal ions as therapeutic agents in cardiovascular disease and their delivery strategies

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Regenerative Biomaterials 2024年第2期3卷 1-16页

作者： Xiaoqian hong Geer tian Yang Zhu Tanchen Ren Department of Cardiology of the Second Affliated Hospital and State Key Laboratory of Transvascular Implantation Devices Cardiovascular Key Laboratory of Zhejiang ProvinceZhejiang University School of MedicineHangzhou 310o09China Binjiang Institute of Zhejiang University Hangzhou 310053China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Metal ions participate in many metabolic processes in the human body,and their homeostasis is crucial for *** cardiovascular diseases(CVDs),the equilibriums of metal ions are frequently interrupted,which are related to a variety of disturbances of physiological processes leading to abnormal cardiac *** supplement of metal ions has the potential to work as therapeutic strategies for the treatment of *** with other therapeutic drugs,metal ions possess broad availability,good stability and safety and diverse drug delivery *** delivery strategies of metal ions are important to exert their ther-apeutic effects and reduce the potential toxic side effects for cardiovascular applications,which are also receiving increasing *** local delivery strategies for metal ions based on various biomaterials are constantly being *** this review,we comprehensively summarized the positive roles of metal ions in the treatment of cVDs from three aspects:protecting cells from oxidative stress,inducing angiogenesis,and adjusting the functions of ion *** addition,we introduced the transferability of metal ions in vascular reconstruction and cardiac tissue repair,as well as the currently available engineered strategies for the precise delivery of metal ions,such as integrated with nanoparticles,hydrogels and scaffolds.

关键词： metal ions cardiovascular disease tissue engineering oxidative stress angiogenesis ion channel