检索结果-南通市图书馆

采用ART技术封闭恒牙防龋的6年临床效果观察

在线全文

学校读者我要写书评

暂无评论

实用口腔医学杂志 2007年第5期23卷 704-707页

作者：万呼春胡德渝李雪范旭 edward c.m.lo christopher J.Holmgren 成都四川大学华西口腔医学院口腔预防医学教研室 610041 香港大学牙学院

目的:评价非创伤性充填(ART)技术对恒牙窝沟封闭后,封闭剂保留及新生龋损发生情况。方法:1996年在四川省德阳市4所中学选取12～13岁儿童140名作191个牙ART封闭。采用WHO的ART标准器械,德国ESPE公司生产的高强度玻璃离子材料,对选择的牙... 详细信息

目的:评价非创伤性充填(ART)技术对恒牙窝沟封闭后,封闭剂保留及新生龋损发生情况。方法:1996年在四川省德阳市4所中学选取12～13岁儿童140名作191个牙ART封闭。采用WHO的ART标准器械,德国ESPE公司生产的高强度玻璃离子材料,对选择的牙面窝沟进行封闭;操作者为经中等口腔专业训练的医生。封闭后每年对ART封闭及牙龋损情况进行评价。结果:封闭后1、2、4、6年的完整保留率分别为75.4%、62.5%、50.0%、34.6%;成功率分别为89.6%、78.8%、68.5%、57.9%。试验后1年没有新生龋牙的发生,试验后2、3年,龋患发生率分别为1.6%、2.8%。试验后4年龋病有明显增加,试验4、5、6年后,龋病发生率分别为8.5%、16.1%、15.0%。结论:ART封闭试验3年的保存率较高、新生龋发生率低;试验6年封闭剂保留率虽然有所降低,但其结果还是令人满意的,预防龋病的效果是显著的。但封闭物脱落3年后,若没有重新修复,新龋患率大幅度上升,作为恒牙龋病防治的措施是适合和可接受的;是一种适合于在学校、社区开展的有效、实用的龋病预防方法。

关键词：龋非创伤性充填窝沟封闭玻璃离子

在线全文

学校读者我要写书评

暂无评论

ART技术封闭恒牙的3年临床效果观察

实用口腔医学杂志 2004年第5期20卷 603-606页

作者：万呼春胡德渝刘红春李雪范旭童冠雄 edward c.m.lo christopher J.olmgren 四川省成都市四川大学华西口腔医学院口腔预防医学教研室 610041 香港大学牙学院

目的 :评价非创伤性充填 (ART)技术对恒牙窝沟封闭后 ,封闭剂保留及新生龋病发生情况。方法 :1996年在四川省德阳市 4所中学选取 12～ 13岁儿童 14 0名作 191个ART封闭。采用WHO的ART标准器械 ,德国ESPE公司生产的高强度玻璃离子材料 ,... 详细信息

目的 :评价非创伤性充填 (ART)技术对恒牙窝沟封闭后 ,封闭剂保留及新生龋病发生情况。方法 :1996年在四川省德阳市 4所中学选取 12～ 13岁儿童 14 0名作 191个ART封闭。采用WHO的ART标准器械 ,德国ESPE公司生产的高强度玻璃离子材料 ,对选择的牙面窝沟进行封闭 ;操作者为经中等口腔专业训练的医生。试验 3年后对ART封闭及牙龋病情况进行评价。结果 :封闭后 1、2、3年的封闭成功率分别为 89.6% ,78.8% ,71.9%。试验后 1年没有新生龋齿的发生 ,试验后 2、3年 ,龋患率较低 ,分别为 1.6% ,2 .8%。结论 :ART封闭试验 3年的保存率较高 ,新生龋发生率低 ;作为恒牙龋病防治的措施是适合和可接受的 ;是一种适合于在学校、社区开展的有效、实用的龋病预防方法。

关键词：龋 ART 窝沟封闭玻璃离子

cO oxidation under lean and stoichiometric conditions over ceriazirconia with very low metal contents(cu,co,Ag and Pt)

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1669-1681,I0002页

作者： J.c.martínez-munuera m.P.Yeste A.García-García mcmA Group Department of Inorganic Chemistry and Institute of MaterialsUniversity of AlicanteCarretera de San Vicente del Raspeig s/n03690San Vicente del RaspeigAlicanteSpain Solid chemistry and catalysis Group Department of Materials ScienceMetallurgic Engineering and Inorganic ChemistryInstitute of Electronic Microscopy and Materials ResearchUniversity of CádizAp.40E-11510Puerto RealCádizSpain

In this work,several ceria-zirconia based catalysts with very lo w(and equimolar) metal contents were prepared,characterised and tested for the cO oxidatio n reaction(under lean and stoichiometric conditions),trying to emulate those conditions found in a diesel oxidation catalyst(DOc) system from a diesel engine and those encountered under gasoline exhaust(λ=1).The metals chosen are cu,co,Ag and Pt(as a reliable benchmark).The results reveal enormous differences among reducibility and catalytic activity despite quite similar structural and textural properties of the catalysts,showing differences among dispersion(Ag-catalyst seems to present a low level of dispersion).This catalyst seems to be characterised,as well,by a strong electronic interaction between ce and Ag centres which is suggested to yield an improved reducibility under H_(2)-TPR ***,the order in catalytic activity(cu>Ag>co≈Pt>>support) seems not to follow the order found in reducibility and the cu-catalyst seems to be the most active independently on the reaction conditions,yielding nearly overlapped cO oxidation catalytic *** restingly,a stro ng correlation between the catalytic activity under the two conditions tested and the OSc values of the ce_(0.8)Zr_(0.2)O_(2)-supported metal catalysts is ***,OSc parameter measured at 150℃ can be used as a relevant descriptor to evaluate the cO oxidation activity at low and medium conversions for the investigated catalysts,much better than the H_(2)-TPR measurements.

关键词： cO oxidation low metal content ceria-zirconia copper species OSc parameter Rare earths

Influence of the Nature of the Incoming Sludge on the Performance of a Vertical Flow Reed Beds in Dakar-Senegal

在线全文

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2024年第6期16卷 429-449页

作者： Elhadji mamadou Sonko Diomaye Dieng maïmouna lo cheikh Diop Laboratoire dEtude Environnemental des milieux Urbains (LEEmUR) Institut des Sciences de lEnvironnement (ISE) Facult des Sciences et Technique (FST) Universit Cheikh Anta Diop de Dakar (UCAD) Dakar-Fann Sngal

This work investigates the influence of the type sludge on drainage, plant development, purification performances and biosolids quality. Drainage properties were measured through the frequency of clogging, the percentage of leachate recovered and the dryness of accumulated sludge. Plant development was measured through the density, the height and the stem diameter. Purification performance was evaluated from the reduction rate. Biosolids quality was measured after 3 months of maturation. The results show that the clogging frequencies were 9.5%;0% and 3.7%;the volume of leachate recovered was 42.2%;20.4% and 24.7% and, the dryness was 33.4%;61.1% and 52.4% for FS-ST, FS-STT and SS respectively. Plants densities were about, with densities 197.1, 171.3 and 178.3 plants/m2 in beds fed respectively with FS-ST, FS-STT and SS. Despite the high removal rates, the concentrations of pollutants in the leachates are above the Senegalese standard NS 05-061 for discharge into the environment. The biosolids are all mature with c/N and NH4+/NO3?ratios lower than 12 and 1 respectively. The biosolids are also rich in organic and mineral elements. The concentrations of Ascaris eggs are higher than the WHO recommendations. These biosolids should be stored for additional time or composted.

关键词： Biosolid Quality Dewatering Performance Planted Drying Beds Purification Performance Sludge Type

Biofabrication of nanocomposite-based scaffolds containing human bone extracellularmatrix for the differentiation of skeletal stem and progenitor cells

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

Bio-Design and manufacturing 2024年第2期7卷 121-136页

作者： Yang-Hee Kim Janos m.Kanczler Stuart Lanham Andrew Rawlings marta Roldo Gianluca Tozzi Jonathan I.Dawson Gianluca cidonio Richard O.c.Oreffo Faculty of medicine Bone and Joint Research GroupCentre for Human DevelopmentStem Cells and RegenerationInstitute of Developmental SciencesUniversity of SouthamptonSouthampton SO166YDUK School of Pharmacy and Biomedical Science University of PortsmouthPortsmouth PO12DTUK School of Engineering Faculty of Engineering and ScienceUniversity of GreenwichGreenwich ME44TBUK center for Life Nano-and Neuro-Science(cLN2S) Italian Institute of Technology00161 RomeItaly

Autograft or metal implants are routinely used in skeletal ***,they fail to provide long-term clinical resolution,necessitating a functional biomimetic tissue engineering *** use of native human bone tissue for synthesizing a biomimeticmaterial inkfor three-dimensional(3D)bioprintingof skeletal tissueis anattractivestrategyfor ***,human bone extracellular matrix(bone-Ecm)offers an exciting potential for the development of an appropriate microenvironment for human bone marrow stromal cells(HBmScs)to proliferate and differentiate along the osteogenic *** this study,we engineered a novel material ink(LAB)by blending human bone-Ecm(B)with nanoclay(L,Laponite®)and alginate(A)polymers using extrusion-based *** inclusion of the nanoﬁller and polymeric material increased the rheology,printability,and drug retention properties and,critically,the preservation of HBmScs viability upon *** composite of human bone-Ecm-based 3D constructs containing vascular endothelial growth factor(VEGF)enhanced vascularization after implantation in an ex vivo chick chorioallantoic membrane(cAm)*** inclusion of bone morphogenetic protein-2(BmP-2)with the HBmScs further enhanced vascularization and mineralization after only seven *** study demonstrates the synergistic combination of nanoclay with biomimetic materials(alginate and bone-Ecm)to support the formation of osteogenic tissue both in vitro and ex vivo and offers a promising novel 3D bioprinting approach to personalized skeletal tissue repair.

关键词： Extracellular matrix Nanoclay Bone 3D bioprinting

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

在线全文

学校读者我要写书评

暂无评论

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

Genomics-driven derivatization of the bioactive fungal sesterterpenoid variecolin:creation of an unnatural analogue with improved anticancer properties

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第1期14卷 421-432页

作者： Dexiu Yan Jemma Arakelyan Teng Wan Ritvik Raina Tsz Ki chan Dohyun Ahn Vladimir Kushnarev Tsz Kiu cheung Ho ching chan Inseo choi Pui Yi Ho Feijun Hu Yujeong Kim Hill Lam Lau Ying lo Law chi Seng Leung chun Yin Tong Kai Kap Wong Wing Lam Yim Nikolay S.Karnaukhov Richard Y.c.Kong maria V.Babak Yudai matsuda Department of chemistry City University of Hong KongHong Kong SARChina iGEm Team“Variecure” City University of Hong KongHong Kong SARChina Department of Biomedical Engineering City University of Hong KongHong Kong SARChina moscow clinical Research center Named After A.S.loginov Moscow 111123Russian Federation

A biosynthetic gene cluster for the bioactive fungal sesterterpenoids variecolin(1)and variecolactone(2)was identified in Aspergillus aculeatus ATcc *** production of 1 and 2 was achieved in Aspergillus oryzae by expressing the sesterterpene synthase VrcA and the cytochrome P450 ***,the replacement of VrcB with homologous P450s from other fungal terpenoid pathways yielded three new variecolin analogues(5-7).Analysis of the compounds’anticancer activity in vitro and in vivo revealed that although 5 and 1 had comparable activities,5 was associated with significantly reduced toxic side effects in cancer-bearing mice,indicating its potentially broader therapeutic *** study describes the first tests of variecolin and its analogues in animals and demonstrates the utility of synthetic biology for creating molecules with improved biological activities.

关键词： Animal studies Anticancer properties Biosynthesis Natural products Sesterterpenoids Synthetic biology Terpene synthases Variecolin

Seminal biomarkers for the evaluation of male infertility

在线全文

学校读者我要写书评

暂无评论

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

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

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.