检索结果-南通市图书馆

Effectiveness of a microabrasion technique using 16% HCL with manual application on fluorotic teeth: A series of studies

引用

World Journal of Clinical Cases 2020年第4期8卷 743-756页

作者： Martina Nevárez-Rascón Nelly Molina-Frechero edith adame Ethel Almeida Uriel Soto-Barreras Enrique Gaona Alfredo Nevárez-Rascón Facultad de Odontología Maestría en EstomatologíaUniversidad Autónoma de ChihuahuaChihuahua 31000México División de Ciencias Biológicas y de la Salud Universidad Autónoma MetropolitanaXochimilco 04960México

BACKGROUND Dental fluorosis is caused by excessive fluoride ingestion during tooth *** a consequence,there is a higher porosity on the enamel surface,which causes an opaque *** The aim of this study was to identify a dental intervention to improve the smile in patients with tooth *** aims were to relate the stain size on fluorotic teeth with the effectiveness of stain removal,enamel loss and procedure time using a manual microabrasion technique with 16%hydrochloric acid(HCL).METHODS An experimental study was carried out on 84 fluorotic teeth in 57 adolescent patients,33 females and 24 males,with moderate to severe *** means,standard deviations and percentages were analyzed using nonparametric statistics and ArchiCAD 15 software was used for the variables including stain size and effectiveness of stain *** The average enamel loss was 234μm and was significantly related to the procedure time categorized as 1-4 min and 4.01-6 min,resulting in a P>*** microabrasion technique using 16%HCL was effective in 90.6%of patients and was applied manually on superficial stains in moderate and severe *** time was less than 6 min and enamel loss was within the acceptable *** Microabrasion is a first-line treatment;however,the clinician should measure the average enamel loss to ensure that it is within the approximate range of 250μm in order to avoid restorative treatment.

关键词： Microabrasion of the enamel Dental fluorosis Enamel stains Fluorotic teeth Hydrochloric acid 16% Stain removal

来源：

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

The evolution of sexual imprinting in socially monogamous populations

引用

Current Zoology 2015年第6期61卷 1043-1061页

作者： edith INVERNIZZI R. Tucker GILMAN Faculty of Life Sciences University of Manchester C. 1249a Michael Smith Building Dover Street Manchester M 13 9PL UK

Sexual imprinting is a common mechanism of mate preference learning. It is thought to influence how traits evolve and in some cases to promote speciation. Recently there has been increasing interest in how sexual imprinting itself evolves. Theoretical work on polygynous mating systems predicts that females will evolve paternal imprinting, which means they learn to prefer phenotypes expressed by their fathers. In nature however, females of some species learn to prefer phenotypes expressed by their mothers instead. We used a dynamical systems model and tools from adaptive dynamics to study how sexual imprinting evolves in species with socially monogamous mating systems. We considered cases in which the target trait for imprinting is un- der viability selection but is not a reliable signal of paternal investment. Thus, the target trait signals the genetic benefits rather than the parental care benefits of mate choice. When mating is socially monogamous and there is some extra-pair patemity, we show that maternal imprinting can be favored over paternal imprinting. Counterintuitively, females often become choosier when selecting social partners in systems where extra-pair mating is more frequent. That is, females may be more selective when choosing social partners that will sire a smaller percentage of their offspring. Our results offer new testable hypotheses, and ad- vance our understanding of the mechanisms that drive the evolution of mate choice strategies in nature .

关键词： Sexual imprinting Mate preference learning Monogamy Extra-pair mating Evolution Model

来源：

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

Treatment of Helicobacter pylori infection in atrophic gastritis

引用

World Journal of Gastroenterology 2018年第22期24卷 2373-2380页

作者： edith Lahner Marilia Carabotti Bruno Annibale Medical-Surgical Department of Clinical Sciences and Translational Medicine Sant'Andrea Hospital University Sapienza

Helicobacter pylori(Hp) is a major human pathogen causing chronic, progressive gastric mucosal damage and is linked to gastric atrophy and cancer. Hp-positive individuals constitute the major reservoir for transmission of infection. There is no ideal treatment for Hp. Hp infection is not cured by a single antibiotic, and sometimes, a combined treatment with three or more antibiotics is ineffective. Atrophic gastritis(AG) is a chronic disease whose main features are atrophy and/or intestinal metaplasia of the gastric glands, which arise from long-standing Hp infection. AG is reportedly linked to an increased risk for gastric cancer, particularly when extensive intestinal metaplasia is present. Active or past Hp infection may be detected by conventional methods in about two-thirds of AG patients. By immunoblotting of sera against Hp whole-cell protein lysates, a previous exposure to Hp infection is detected in all AG patients. According to guidelines, AG patients with Hp positivity should receive eradication treatment. The goals of treatment are as follows:(1) Cure of infection, resolution of inflammation and normalization of gastric functions;(2) possible reversal of atrophic and metaplastic changes of the gastric mucosa; and(3) prevention of gastric cancer. An ideal antibiotic regimen for Hp should achieve eradication rates of approximately 90%, and complex multidrug regimens are required to reach this goal. Amongst the factors associated with treatment failure are high bacterial load, high gastric acidity, Hp strain, smoking, low compliance, overweight, and increasing antibiotic resistance. AG, when involving the corporal mucosa, is linked to reduced gastric acid secretion. At a non-acidic intra-gastric p H, the efficacy of the common treatment regimens combining proton pump inhibitors with one or more antibiotics may not be the same as that observed in patients with Hp gastritis in an acid-producing stomach. Although the efficacy of these therapeutic regimens has

关键词： Atrophic gastritis Preneoplastic condition Intestinal metaplasia Helicobacter pylori Eradication treatment

来源：

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

Real-time air pollution monitoring with sensors on city bus

引用

Digital Communications and Networks 2020年第1期6卷 23-30页

作者： Sami Kaivonen edith C.-H.Ngai Department of Information Technology Uppsala UniversitySweden

This paper presents an experimental study on real-time air pollution monitoring using wireless sensors on public transport *** study is part of the GreenIoT project in Sweden,which utilizes Internet-of-Things to measure air pollution level in the city center of *** deploying low-cost wireless sensors,it is possible to obtain more fine-grained and real-time air pollution levels at different *** sensors on public transport vehicles complement the readings from stationary sensors and the only ground level monitoring station in *** paper describes the deployment of wireless sensors on Uppsala buses and the integration of the mobile sensor network with the GreenIoT *** experiments have been conducted to evaluate the communication quality and data quality of the system.

关键词： Smart city Internet-of-Things Mobile sensor network Air pollution monitoring

来源：

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

Toluene degradation by a water/silicone oil mixture for the design of two phase partitioning bioreactors

引用

Chinese Journal of Chemical Engineering 2017年第10期25卷 1512-1518页

作者： Maxime Guillerm Annabelle Couvert Abdeltif Amrane edith Norrant Audrey Breton éric Dumont Erole Nationale Supérieure de Chimie de Rennes UMR CNRS 6226 11 allee de Beaulieu CS 5083K 35708 Rennes Cedex 7 France UCB BioPharma sprl Avenue de l'Industrie B 1420 Braine l'Alleud Belgum Total S.A CSTJF Avenue Larribau CA 374 64018 Pau Cedex France UMR CNRS 6144 GEPEA IMT-Atlantique La Chantrerie 4 rue Alfred Kastler B.P. 20722 44307 Nantes Cedex 3 France

Toluene degradation performances were studied in a 10 L Two-Phase Partitioning Bioreactor(TPPB).The liquid phase consisted of a mixture of water and PDMS 50(Poly Di Methyl Siloxane,*** oil,viscosity of 46 m Pa·s) in the volume ratio of 75%/25%.Two series of experiments were carried out:in the first,the reactor was sequentially supplied with toluene whereas in the second,toluene was continuously *** sludge from the wastewater treatment plant of Beaurade(Rennes,France) was used at an initial concentration of 0.5 dry mass g·(mixture L)^(-1).The elimination capacity(EC) was investigated as well as the change in biomass concentration over *** biodegradation was very ef ficient(removal ef ficiency,RE=100%) for toluene flows ranging from 0.2 to 1.2 ml·h^(-1),corresponding to elimination capacities of up to 104 g·m^(-3)·h^(-1).For a toluene flow of 1.2 ml·h^(-1),the biomass concentration measured at the end of the experiment was 4.7 dry mass g·(mixture L)^(-1).The oxygen concentration in the liquid phase was clearly not a limiting factor in these operating *** on these results,an extrapolation leading to the design of a large-scale pilot TPPB can now be considered to study toluene degradation performances in industrial conditions.

关键词： Degradation Toluene Silicone oil Multiphase reactor Biomass

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Using Location based Augmented Reality to Improve Destination Image of China-Beijing:Role of Immersive Experience,User Engagement,Perceived Service Quality and Authenticity

Using Location based Augmented Reality to Improve Destinatio...

引用

作者： Vikih edith Vefemsi 山西大学

学位级别：硕士

旅游业正蓬勃发展,过去七年中全球旅游业保持持续增长。中国旅游业现已发展成为国内经济最重要的支柱产业之一。“旅游目的地形象”这一概念表示游客对特定目的地的综合感知和印象。如今,人们认为良好的旅游目的地形象是带动旅游业发展... 详细信息

旅游业正蓬勃发展,过去七年中全球旅游业保持持续增长。中国旅游业现已发展成为国内经济最重要的支柱产业之一。“旅游目的地形象”这一概念表示游客对特定目的地的综合感知和印象。如今,人们认为良好的旅游目的地形象是带动旅游业发展的重要因素。因此,在旅游业中,旅游目的地形象和沉浸式体验这两个概念获得广泛关注。本研究运用实证主义哲学,基于演绎方法的定量研究,旨在探讨通过提升沉浸体验给旅游目的地形象所带来的影响,并分析通过提升游客的实际用户体验、感知服务质量和感知真实性给旅游目的地形象所带来的间接影响。本研究针对422位旅客通过在线问卷调查的方式收集了与上述变量相关的数据,所有旅客均为到访北京并在旅行期间使用基于地理位置的增强现实技术（LBAR）的人。样本采集针对性强,采样技术便捷。分析结果表明,提升旅客的沉浸式体验不仅对旅游目的地形象影响显著,而且对于旅客的用户体验、感知服务质量和感知真实性给旅游目的地形象所带来的间接影响,影响也较为显著。基于SEM假设检验,证实本研究中提出的所有假设都是正确的。故本研究对于未来旅游业发展以及增强现实技术在旅游业中的应用具有重要意义。

关键词：增强现实技术沉浸式体验旅游目的地形象用户体验感知服务质量感知真实性

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Rare earth element geochemistry in soils along arid and semiarid grasslands in northern China

引用

Ecological Processes 2022年第1期11卷 386-399页

作者： Yi‑Wen Cao Xiao‑Ming Liu Chao Wang edith Bai Nanping Wu CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Department of Earth Marine and Environmental SciencesUniversity of North Carolina‑Chapel HillChapel HillNC 27515USA Key Laboratory of Geographical Processes and Ecological Security of Changbai Mountains School of Geographical SciencesNortheast Normal UniversityChangchun 130024China Institute of Deep‑Sea Science and Engineering Chinese Academy of SciencesSanya 572000China

Background:Rare earth elements(REE)are a group of trace elements that behave geochemically *** fractionation patterns normalized to reference materials provide a powerful tool for documenting *** processes are particularly difficult to illustrate with respect to contemporary and past climate *** this study,we characterize the rare earth element(REE)contents in bulk soils and respective geochemical fractions(e.g.,exchangeable,carbonate‑bound,reducible,and oxidizable fractions)and to decipher the relationships between REE geochemistry components and climatic factors across a large‑scale northern China transect(NCT).Results:Across the NCT,bulk REE concentrations ranged from 55.2 to 241.1μg g^(−1)with a main portion in the residual fraction(49–79%),followed by oxidizable fraction(2–40%),reducible fraction(3–22%),carbonate‑bound fraction(0.1–16%),and negligible exchangeable *** REE contents of geochemical components(carbonate‑bound,reducible,and oxidizable)in topsoils correlated to climate factors(mean annual precipitation,mean annual temperature,potential evaporation,and aridity index(AI)).The normalized abundances to the upper continental crust(UCC)composition show that the middle REE was generally enriched than the light REE and heavy REE in topsoils along the *** overall UCC‑normalized bulk REE patterns in topsoils and subsoils were similar,characterized by weak negative Ce anomalies and positive Eu ***:Our data in topsoils and depth profiles collectively suggest that cycling of REE was primarily regulated by abiotic processes in area with AI*** similar UCC normalized patterns in topsoils suggest that the REE was originated from a common source with limited influences from other sources(e.g.,atmospheric dusts and anthropogenic contribu‑tions).Our results to some extent provide evidence for

关键词： Rare earth elements Soil Grassland Northern China Aridity index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reaction mechanism of azoreductases suggests convergent evolution with quinone oxidoreductases

引用

Protein & Cell 2010年第8期1卷 780-790页

作者： Ali Ryan Chan-Ju Wang Nicola Laurieri Isaac Westwood edith Sim Department of Pharmacology University of OxfordMansfield RoadOxfordOX13QTUK

Azoreductases are involved in the bioremediation by bacteria of azo dyes found in waste *** the gut flora,they activate azo pro-drugs,which are used for treatment of inflammatory bowel disease,releasing the active component 5-aminosalycilic *** bacterium *** has three azoreductase genes,paAzoR1,paAzoR2 and paAzoR3,which as recombinant enzymes have been shown to have different substrate *** mechanism of azoreduction relies upon tautomerisation of the substrate to the hydrazone *** report here the characterization of the *** azoreductase enzymes,including determining their thermostability,cofactor preference and kinetic constants against a range of their favoured *** expression levels of these enzymes during growth of *** are altered by the presence of azo *** is shown that enzymes that were originally described as azoreductases,are likely to act as NADH quinone *** low sequence identities observed among NAD(P)H quinone oxidoreductase and azoreductase enzymes suggests convergent evolution.

关键词： azoreductase enzyme mechanism NAD(P)H quinone oxidoreductase enzyme characterisation convergent evolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Formation,stabilization and chemical demulsification of crude oil-in-water emulsions:A review

引用

Petroleum Research 2022年第4期7卷 459-472页

作者： edith Yonguep Kashala Fabrice Kapiamba Katende Jonathan Kabamba Mahabubur Chowdhury Department of Chemical Engineering Cape Peninsula University of TechnologySymphony WayPO Box 1906Bellville7535Cape TownSouth Africa Department of Civil Architectural and Environmental EngineeringMissouri University of Science and TechnologyRollaMO65401USA

The crude oil recovery process is frequently associated with the formation of stable emulsions due to factors such as turbulent flow in pipelines and the presence of surface-active substances that naturally occur in crude *** emulsions are undesirable for the petroleum industry because their destruction/treatment adds to the overall production cost and causes the loss of valuable amounts of crude ***,it is essential,for economic and environmental reasons,to optimize the crude oil demulsification *** effective treatment of crude oil emulsions requires understanding of the process and factors leading to their formation and *** this sense,suitable treatment methods and possible preventive measures to avoid their formation can be *** present study reviews recent oilfield emulsion types and the factors responsible for their formation and *** different demulsification techniques employed were then extensively *** tech-niques include mechanical,thermal,electrical,and chemical methods with different demulsification mechanisms affected by many factors such as emulsions type and properties,demulsifiers characteris-tics,presence of solids stabilized emulsions,*** demulsification efficiency depends on the operating parameters of the process,the economics involved,and the environmental impact,which are the main factors considered in selecting a suitable demulsification *** research on the demulsifi-cation of crude oil emulsions should focus on real crude oil emulsions studies at a pilot scale level,the effect of aging on crude oil emulsions,the combination of multiple demulsification techniques and their synergistic effects,and the use of natural,ecofriendly demulsifiers.

关键词： Crude oil Enhanced oil recovery Emulsions Stabilization Demulsification Surfactants Demulsifiers Coalescence

来源：

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

Adhesion of PBO Fiber in Epoxy Composites

引用

Journal of Donghua University(English Edition) 2007年第2期24卷 173-177页

作者： MADER edith MELCHER Steffen 刘建文高尚林 Leibniz Institute of Polymer Research Dresden Hohe Strasse 601069 DresdenGermany

The high mechanical and thermal performance of poly p-phenylene- 2, 6 - benzobisoxazole （ PBO ） fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T. However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet （UV） irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fibermatrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the harrier effect of the finish. For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy （AFM） topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fi

关键词： PBO fiber composites interface adhesion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：