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中华放射肿瘤学杂志 1996年第2期5卷 31-31页

作者：肖泽芬 theodorec.m.lo

Combining material characterization with single and multi-oxyanion adsorption for mechanistic study of chromate removal by cationic hydrogel

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Journal of Environmental Sciences 2011年第6期23卷 1004-1010页

作者： Irene m.C.lo Samuel C.N.Tang Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina

Cationic hydrogel with magnetic property was synthesized via radical polymerization and its removal capacity of chromate from contaminated water was found to be 200 mg/*** Fourier transform infrared spectroscopy（FT-IR） study,the mechanism of chromate removal by hydrogel was found to be non-specific adsorption,mainly due to ion exchange,as evidenced by the positively charged functional group,trimethyl ammonium-N＋（CH3）3,in the *** were accordingly determined by testing di？erent oxyanion adsorption onto the *** results of the chromate adsorption experiments illustrated that the amount of chromate adsorbed was nearly equal to that of the chloride released from the hydrogel,which is part of the evidence for ion *** and multi-oxyanion adsorption experiments were also performed,and it was demonstrated that ion removal was species independent,but charge dependent,another characteristic of the ion exchange *** was found that the same Langmuir model can be applied to best fit the findings of single and multi-oxyanion adsorption,which further indicates the mechanism of chromate removal is attributed to ion *** view of the above,the background anions compete for adsorption sites with chromate,evidenced by inhibitive chromate removal in the presence of background electrolytes in the batch studies,further echoing the ion exchange mechanism.

关键词： adsorption magnetic hydrogel mechanism ion exchange oxyanion

Seminal biomarkers for the evaluation of male infertility

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Asian Journal of Andrology 2016年第3期18卷 426-433,I0009页

作者： Jared m Bieniek Andrei P Drabovich Kirk C lo Department of Urology Hartford Hospital Hartford CT USA Department of Clinical Biochemistry University Health Network Toronto ON Canada Department ofLaboratory medicine and Pathobiology University of Toronto Toronto ON Canada Department of Surgery Division of Urology Mount Sinai Hospital Toronto ONCanada.

For men struggling to conceive with their partners, diagnostic tools are limited and often consist of only a standard semen analysis. This baseline test serves as a crude estimation of male fertility, leaving patients and clinicians in need of additional diagnostic biomarkers. Seminal fluid contains the highest concentration of molecules from the male reproductive glands, therefore, this review focuses on current and novel seminal biomarkers in certain male infertility scenarios, including natural fertility, differentiating azoospermia etiologies, and predicting assisted reproductive technique success. Currently available tests include antisperm antibody assays, DNA fragmentation index, sperm fluorescence in situ hybridization, and other historical sperm functional tests. The poor diagnostic ability of current assays has led to continued efforts to find more predictive biomarkers. Emerging research in the fields of genomics, epigenetics, proteomics, transcriptomics, and metabolomics holds promise for the development of novel male infertility biomarkers. Seminal protein-based assays of TEXI01, ECm 1, and ACRV1 are already available or under final development for clinical use. Additional panels of DNA, RNA, proteins, or metabolites are being explored as we attempt to understand the pathophysiologic processes of male infertility. Future ventures will need to continue data integration and validation for the development of clinically useful infertility biomarkers to aid in male infertility diagnosis, treatment, and counseling.

关键词： assisted reproductive techniques diagnosis male infertility, semen

Numerical analysis and centrifugal modeling of LNAPLs transport in subsurface system

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Progress in Natural Science:materials International 2006年第4期16卷 416-424页

作者： lo I.m.C. mEEGODA J.N. Department of Civil Engineering Hong Kong University of Science and Technology Hong Kong SARChina Department of Civil and Environmental Engineering New Jersey Institute of Technology USA

The transport of non-aqueous phase liquids (NAPLs) in unsaturated soils and groundwater is an important research topic in geo-environmental engineering. In this paper, the mechanism of light NAPLs (LNAPLs) transport in subsurface system is briefly introduced, and the mass transport equations, fluid flow equations, and the constitutive model of relative permeability - saturation - capillary pressure are discussed. Then the numerical method is introduced to simulate the multiphase flow problems in porous media, and the tempospatial distribution of LNAPLs is obtained. moreover, different boundary conditions are employed in numerical simulation to investigate its effect on transport behavior. To verify the numerical data, centrifugal tests are conducted to model the LNAPLs migration in unsaturated soils and groundwater. The calculation results are agreeable with the experimental findings of centrifugal modeling, which indicates that LNAPLs from leaking point move downwards due to gravity force, and form a high concentration zone above the capillary fringe, and then spread out laterally along the groundwater table. Some LNAPL enters groundwater system to further migrate. The combination of numerical simulation and centrifuge modeling can be a useful means to study the transport behavior of LNAPLs in subsurface system.

关键词： geo-environmental engineering subsurface contamination multiphase flow light non-aqueous phase liquids (LNAPLs) centrifugal modeling technique numerical simulation.

Simultaneous removal of chromium and arsenate from contaminated groundwater by ferrous sulfate:Batch uptake behavior

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Journal of Environmental Sciences 2011年第3期23卷 372-380页

作者： Xiaohong Guan Haoran Dong Jun ma Irene m. C. lo State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong 999077 China

Chromium and/or arsenate removal by Fe（Ⅱ） as a function of pH, Fe（Ⅱ） dosage and initial Cr（Ⅵ）/As（Ⅴ） ratio were examined in batch tests. The presence of arsenate reduced the removal efficiency of chromium by Fe（Ⅱ）, while the presence of chromate significantly increased the removal efficiency of arsenate by Fe（Ⅱ） at pH 6-8, In the absence of arsenate, chromium removal by Fe（Ⅱ） increased to a maximum with increasing pH from 4 to 7 and then decreased with a further increase in pH. The increment in Fe（Ⅱ） dosage resulted in an improvement in chromium removal and the improvement was more remarkable under alkaline conditions than that under acidic conditions. Chromium removal by Fe（Ⅱ） was reduced to a larger extent under neutral and alkaline conditions than that under acidic conditions due to the presence of 10 μtmol/L arsenate. The presence of 20 μmol/L arsenate slightly improved chromium removal by Fe（Ⅱ） at pH 3.9-5,8, but had detrimental effects at pH 6.7-9.8. Arsenate removal was improved significantly at pH 4-9 due to the presence of 10μmol/L chromate at Fe（Ⅱ） dosages of 20-60 μmol/L. Elevating the chromate concentration from 10 to 20μmol/L resulted in a further improvement in arsenate removal at pH 4.0-4.6 when Fe（Ⅱ） was dosed at 30-60 μmol/L.

关键词： chromium removal arsenate removal ferrous iron groundwater treatment

A comparative analysis of alternative approaches to fitting species-abundance models

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Journal of Plant Ecology 2012年第1期5卷 32-45页

作者： Sean R.Connolly loïc m.Thibaut School of marine and Tropical Biology and ARC Centre of Excellence for Coral Reef Studies James Cook UniversityTownsvilleQueensland 4811Australia

Aims Fits of species-abundance distributions to empirical data are increasingly used to evaluate models of diversity maintenance and community structure and to infer properties of communities,such as species *** distributions predicted by several models are the Poisson lognormal(PLN)and the negative binomial(NB)distribution;however,at least three different ways to parameterize the PLN have been proposed,which differ in whether unobserved species contribute to the likelihood and in whether the likelihood is conditional upon the total number of individuals in the *** of these has an analogue for the ***,we propose a new formulation of the PLN and NB that includes the number of unobserved species as one of the estimated *** investigate the performance of parameter estimates obtained from this reformulation,as well as the existing alternatives,for drawing inferences about the shape of species abundance distributions and estimation of species *** We simulate the random sampling of a fixed number of individuals from lognormal and gamma community relative abundance distributions,using a previously developed‘individual-based’bootstrap *** use a range of sample sizes,community species richness levels and shape parameters for the species abundance distributions that span much of the realistic range for empirical data,generating 1000 simulated data sets for each parameter *** then fit each of the alternative likelihoods to each of the simulated data sets,and we assess the bias,sampling variance and estimation error for each *** Findings Parameter estimates behave reasonably well for most parameter values,exhibiting modest levels of median ***,for the NB,median error becomes extremely large as the NB approaches either of two limiting *** both the NB and PLN,>90%of the variation in the error in model parameters across parameter sets is explained by three quantities that corresponded to t

关键词： Poisson lognormal negative binomial Poisson gamma species-abundance distributions species richness

Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(Ⅵ) and P(Ⅴ) removal

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Journal of Environmental Sciences 2014年第12期26卷 2379-2386页

作者： Wei Yao Pinhua Rao Irene m.C.lo Wenqi Zhang Wenrui Zheng School of Chemistry and Chemical Engineering Shanghai University of Engineering Science Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology

Pollutants that exist in anionic species are issues of concern in water treatment. Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties（Qm-chitosan） was prepared and employed to remove chromium（VI） and phosphorus（V）（Cr（VI） and P（V）） from aqueous environments. The Qm-chitosan was characterized by Fourier transform infrared spectrometry（FT-IR）,thermogravimetric analysis（TGA）, energy dispersive X-ray（SEm-EDX） and zeta *** experiments show that Qm-chitosan can effectively remove Cr（VI） and P（V）, and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr（VI） and P（V） removal. The adsorption isotherms of both Cr（VI） and P（V） on the Qm-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P（V）（2.783 mmol/g） was found to be higher than that of Cr（VI）（2.323 mmol/g）, resulting from the size of the H2PO-4ions being smaller than that of the HCr O-4ions. However, the theoretical calculation and experimental results showed that Qm-chitosan had a stronger affinity for Cr（VI） than P（V）. The adsorption–desorption of the Qm-chitosan was evaluated, and high regeneration rates were demonstrated.

关键词： magnetic chitosan Quaternary ammonium Cr(VI) P(V) Adsorption

Autolysosomal acidification impairment as a mediator for TNFR1 induced neuronal necroptosis in Alzheimer’s disease

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Neural Regeneration Research 2024年第9期19卷 1869-1870页

作者： Evridiki Asimakidou Richard Reynolds Anna m.Barron Chih Hung lo Department of Clinical Neurosciences University of CambridgeCambridgeUK Department of Brain Sciences Faculty of MedicineImperial College LondonLondonUK Lee Kong Chian School of medicine Nanyang Technological UniversitySingaporeSingapore

Neuronal necroptosis-an emerging form of regulated cell death associated with neuroinflammatory signaling:Alzheimer’s disease(AD)is characterized by the presence of extracellular amyloid-β(Aβ)plaques and intracellular tau neurofibrillary tangles as well as progressive neuronal *** evidence has suggested that prolonged neuroinflammation with increased levels of cytokines,arising from neuronal injury,innate immune responses from glial cells,and peripheral inflammation,leads to neuronal death and AD progression.

关键词： Alzheimer death tau Aβ

Equilibrium Configurations of Lipid Bilayer membranes and Carbon Nanostructures

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Communications in Theoretical Physics 2013年第2期59卷 213-228页

作者： Ivalo m. mladenov Peter A. Djondjorov mariana Ts. Hadzhilazova Vassil m. Vassilev Institute of Biophysics Bulgarian Academy of Sciences Acad. G. Bonchev Str. Block 21 1113 Sofia Bulgaria Institute of mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Str. Block 4 1113 Sofia Bulgaria

The present article concerns the continuum modelling of the mechanical behaviour and equilibrium shapes of two types of nano-scale objects： fluid lipid bilayer membranes and carbon nanostructures. A unified continuum model is used to handle four different ease studies. Two of them consist in representing in analytic form cylindrical and axisymmetric equilibrium configurations of single-wall carbon nanotubes and fluid lipid bilayer membranes subjected to uniform hydrostatic pressure. The third one is concerned with determination of possible shapes of junctions between a single-wall carbon nanotube and a fiat graphene sheet or another single-wall carbon nanotube. The last one deals with the mechanical behaviour of closed fluid lipid bilayer membranes （vesicles） adhering onto a fiat homogeneous rigid substrate subjected to micro-injection and uniform hydrostatic pressure.

关键词： fluid membranes graphene carbon nanotubes carbon nanostructures junctions variational statement Euler-Lagrange equations natural boundary conditions cell injection adhesion equi- librium shapes

A multifaceted approach towards understanding the peculiar behavior of(α)-hydroxyiminophosphonates

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Organic Chemistry Frontiers 2022年第1期9卷 173-182页

作者： Thomas Toupy Christopher Kune Kristof Van Hecke loïc Quinton Jean-Christophe m.monbaliu Center for Integrated Technology and Organic Synthesis MolSys Research UnitUniversity of LiègeB-4000 Liège(Sart Tilman)Belgium mass Spectrometry Laboratory MolSys Research UnitUniversity of LiègeB-4000 Liège(Sart Tilman)Belgium XStruct Department of ChemistryGhent UniversityKrijgslaan 281-S3B-9000 GhentBelgium

The peculiar isomer-selective reduction of(α)-hydroxyiminophosphonates(oxime isomers)into(α)-hydroxyaminophosphonate(hydroxylamine)derivatives is presented.A library of 16(α)-hydroxyiminophosphonates is prepared and studied via a unique multifaceted approach involving the interplay of NmR,XRD,mS,Im-mS and computational chemistry *** combination of NmR,XRD and HPLC enables the seamless separation,identification and quantification of the oxime isomers(E/Z).Tandem mS(mS/mS)enables the determination of the fragmentation patterns for both *** energy breakdown curves highlight the order of apparition of the fragments as well as their related energy of fragmentation,demonstrating that the strength of the C–P bond in the Z isomers is much weaker than in the E *** chemistry demonstrates that favorable protonation site is isomer-dependent with the phosphonate moiety being the favorable protonation site for the E isomers,while protonation occurs preferentially on the amino moiety for Z isomers regardless of the phosphite *** combination of these various methods led an unprecedented level of characterization of oxime isomers,providing a better uderstanding of the isomer-dependent behavior of(α)-hydroxyiminophosphonates.

关键词： isomers phosphonate moiety