检索结果-南通市图书馆

Fungal contamination of stored automobile-fuels in a tropical environment

Journal of environmental Sciences 2010年第10期22卷 1595-1601页

作者： Carlos E.RODRíGUEZ-rodríguez evelyn rodríguez Rigoberto Blanco Ivannia Cordero Daniel Segura Research Center in Tropical Diseases and Laboratory of Research in Anaerobic Bacteriology Faculty of MicrobiologyUniversity of Costa Rica Department of Chemical engineering School of EngineeringAutonomous University of Barcelona Research Center in electrochemistry and Chemical energy University of Costa Rica

Because of the lack of reports, the base levels of microbial contamination on stored fuels are unknown in tropical regions and it is unclear whether these levels have some influence on fuel quality parameters. Therefore, fungal quality in automobile fuels stored across Costa Rican territory was evaluated during two years according to the standard ASTM D6974-04. For a total of 96 samples, counts and identification of molds and yeasts were performed on regular gas, premium gas and diesel taken from the bottom and superior part of the container tanks. The highest contamination was found on the bottom of the tanks, where an aqueous phase was usually identified, showing populations over the ones present in the hydrocarbon itself （up to 108 CFU/L）. Diesel was the most contaminated fuel （up to 107 CFO/L）; however, an alteration on the physicochemical parameters was not observed in any kind of fuel. Seventy-five mold strains were isolated, Penicillium sp. being the most common genus （45.8% of the samples）, and ten yeast strains, from the genera Candida sp. and Rhodotorula sp. Four of the yeasts were able to grow on diesel as the sole carbon source, at concentrations ranging from 0.5% to 25%. Increasing the frequency of tank cleaning, adding antimicrobial agents and monitoring microbial populations are recommended strategies to improve microbial quality of stored fuels.

关键词： fuel microbial contamination biodegradation molds yeasts

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

Removal of carbofuran is not affected by co-application of chlorpyrifos in a coconut fiber/compost based biomixture after aging or pre-exposure

引用

Journal of environmental Sciences 2016年第8期28卷 182-189页

作者： Juan Salvador Chin-Pampillo Mario Masís-Mora Karla Ruiz-Hidalgo elizabeth Carazo-Rojas Carlos E.RODRíGUEZ-rodríguez Research Center of environmental Contamination (CICA) University of Costa Rica

Biomixtures constitute the biologically active part of biopurification systems（BPS）, which are used to treat pesticide-containing wastewater. The aim of this work was to determine whether co-application of chlorpyrifos（CLP） affects the removal of carbofuran（CFN）（both insecticide/nematicides） in a coconut fiber–compost–soil biomixture（FCS biomixture）, after aging or previous exposure to CFN. Removal of CFN and two of its transformation products（3-hydroxycarbofuran and 3-ketocarbofuran） was enhanced in pre-exposed biomixtures in comparison to aged biomixtures. The co-application of CLP did not affect CFN removal, which suggests that CLP does not inhibit microbial populations in charge of CFN transformation.Contrary to the removal behavior, mineralization of radiolabeled14C-pesticides showed higher mineralization rates of CFN in aged biomixtures（with respect to freshly prepared or pre-exposed biomixtures）. In the case of CLP, mineralization was favored in freshly prepared biomixtures, which could be ascribed to high sorption during aging and microbial inhibition by CFN in pre-exposure. Regardless of removal and mineralization results, toxicological assays revealed a steep decrease in the acute toxicity of the matrix on the microcrustacean Daphnia magna（over 97%） after 8 days of treatment of individual pesticides or the mixture CFN/CLP.Results suggest that FCS biomixtures are suitable to be used in BPS for the treatment of wastewater in fields where both pesticides are employed.

关键词： Biomixture Pesticide Mineralization Toxicity Biopurification system

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

Nitrapyrin effectiveness in reducing nitrous oxide emissions decreases at low doses of urea in an Andosol

引用

Pedosphere 2021年第2期31卷 303-313页

作者： Mayela MONGe-MUÑOZ Segundo URQUIAGA Christoph MÜLLeR Juan Carlos CAMBRONeROHeINRICHS Mohammad ZAMAN Cristina CHINCHILLA-SOTO Azam BORZOUeI Khadim DAWAR Carlos E.RODRíGUEZ-rodrÍguez Ana Gabriela PÉReZ-CASTILLO environmental Pollution Research Center(CICA) University of Costa RicaMontes de Oca 11501(Costa Rica) embrapa Agrobiology Rod.BR 465km 7SeropédicaRJCEP 23891-000(Brazil) Institute of Plant ecology Justus Liebig University GiessenHeinrich-Buff Ring 26Giessen 35392(Germany) School of Biology and environmental Science University College DublinBelfieldDublin 4(Ireland) Soil and Water Management&Crop Nutrition Section Joint FAO/IAEA Division of Nuclear Techniques in Food and AgricultureDepartment of Nuclear Sciences and ApplicationsInternational Atomic Energy AgencyVienna International CentreVienna 1400(Austria) Nuclear Agriculture Research School Nuclear Science and Technology Research Institute(NSTRI)Karaj ***(Iran) Department of Soil and environmental Sciences University of AgriculturePeshawar 25000(Pakistan)

In the tropics,frequent nitrogen(N)fertilization of grazing areas can potentially increase nitrous oxide(N_(2)O)emissions.The application of nitrification inhibitors has been reported as an effective management practice for potentially reducing N loss from the soil-plant system and improving N use efficiency(NUe).The aim of this study was to determine the effect of the co-application of nitrapyrin(a nitrification inhibitor,NI)and urea in a tropical Andosol on the behavior of N and the emissions of N_(2)O from autotrophic and heterotrophic nitrification.A greenhouse experiment was performed using a soil(pH 5.9,organic matter content 78 g kg^(-1),and N 5.6 g kg^(-1))sown with Cynodon nlemfuensis at 60%water-filled pore space to quantify total N_(2)O emissions,N_(2)O derived from fertilizer,soil ammonium(NH_(4)^(+))and nitrate(NO_(3)^(-)),and NUe.The study included treatments that received deionized water only(control,NI).No significant differences were observed in soil NH_(4)^(+)content between the UR and UR+NI treatments,probably because of soil mineralization and NO_(3)^(-)produced by heterotrophic nitrification,which is not effectively inhibited by nitrapyrin.After 56 d,N_(2)O emissions in UR(0.51±0.12 mg N_(2)O-N concluded that the soil organic N mineralization and heterotrophic nitrification are the main processes of NH_(4)^(+)and NO_(3)^(-)production.Additionally,it was found that N_(2)O emissions were partially a consequence of the direct oxidation of the soil's organic N via heterotrophic nitrification coupled to denitrification.Finally,the results suggest that nitrapyrin would likely exert significant mitigation on N_(2)O emissions only if a substantial N surplus exists in soils with high organic matter content.

关键词： autotrophic nitrification heterotrophic nitrification mineral N ^(15)N tracer nitrification inhibitor tropical grass

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

Reline低熔溶剂中铝纳米颗粒和叶状显微组织的电化学形核和长大:温度和工作电极角速度的影响

引用

Transactions of Nonferrous Metals Society of China 2022年第3期32卷 1050-1060页

作者： G.VIDAL-GARCÍA C.e.GUINTO-PANO I.GARCÍA-HeRNÁNDeZ E.RODRíGUEZ-CLeMeNTe P.MORALeS-GIL M.T.RAMÍReZ-SILVA M.ROMeRO-ROMO M.PALOMAR-PARDAVÉ Universidad Autónoma Metropolitana-Azcapotzalco Departamento de MaterialesAv.San Pablo 180 Col.Reynosa-TamaulipasCDMXC.P.02200México Instituto Mexicano del Petróleo Laboratorio de Caracterización de Materiales Sintéticos y NaturalesEje Central Lázaro Cárdenas 152CDMXC.P.07730México Universidad Autónoma Metropolitana-Iztapalapa Departamento de QuímicaAv.San Rafael Atlixco#186Col.VicentinaCDMX.C.P.09340México

利用电化学和表面表征技术,研究在不同温度和工作电极角速度(ω)下,含Al(III)离子的Reline低共熔溶剂中铝在玻碳电极上形核和长大的电化学行为。结果表明,随着温度的升高,Al(III)DeS的还原发生在较低的负电位,而此时伏安图中的电流峰增... 详细信息

利用电化学和表面表征技术,研究在不同温度和工作电极角速度(ω)下,含Al(III)离子的Reline低共熔溶剂中铝在玻碳电极上形核和长大的电化学行为。结果表明,随着温度的升高,Al(III)DeS的还原发生在较低的负电位,而此时伏安图中的电流峰增大,这对Al沉积动力学和热力学条件有利。实际上,由于Al被Al(OH)_(3)(s)和Al_(2)O_(3)(s)钝化,未检测到阳极电流。当ω=0 r/min时,通过由Al三维扩散控制的形核、长大和残余水还原组成的理论模型,分析Al沉积时计时电流图。然而,用于分析不同角速度下的理论模型,其吸附−解吸和扩散控制的形核−长大是同时发生的。用SeM、eDX、XPS和XRD表征沉积物,结果表明,当ω=0 r/min时,形成分布良好的纳米颗粒((78.1±9.5)nm);而当ω=900 r/min时,形成直径约为10μm,由Al、Al(OH)_(3)(s)和γ-A2O3(s)组成的叶状显微组织。

关键词：铝电化学形核低共熔溶剂工作电极角速度温度

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

激光冲击工艺对6061-T6铝合金侵蚀性能的影响（英文）

引用

Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1522-1530页

作者： J.IBARRA E.RODRíGUEZ O.JIMéNeZ G.GóMeZ-ROSAS M.FLOReS J.VeRDUZCO J.CHáVeZ Universidad de Guadalajara Departamento de Ingeniería de Proyectos Universidad de Guadalajara Departamento de Física Centro Universitario de Ciencias Exactas e Ingenierías

采用激光冲击工艺处理6061-T6铝合金,研究了二氧化硅砂对其侵蚀磨损性能的影响。其中冲击角为15°、30°、60°、90°,粒子速率为37和58 m/s,采用两种激光进行辐照。采用3D轮廓测量法表征了侵蚀形貌,并采用SeM研究其侵蚀机理。结果表明... 详细信息

采用激光冲击工艺处理6061-T6铝合金,研究了二氧化硅砂对其侵蚀磨损性能的影响。其中冲击角为15°、30°、60°、90°,粒子速率为37和58 m/s,采用两种激光进行辐照。采用3D轮廓测量法表征了侵蚀形貌,并采用SeM研究其侵蚀机理。结果表明,冲击角较小时,侵蚀磨损最大。侵蚀强度和侵蚀机理不受激光冲击工艺的影响,而与侵蚀的高应变速率有关。侵蚀图之间的差异是由于激光冲击工艺造成的表面粗糙度不同。最大质量损失和最大侵蚀深度分别出现在冲击角度为15°和30°时。最后,发现了明显的侵蚀机理的转移,从低角度的切割机制到90°时的凹坑形成。

关键词： 6061-T6铝合金侵蚀磨损激光冲击工艺

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

Nano to micro size transition of hydroxyapatite in porcine bone during heat treatment with low heating rates

引用

Progress in Natural Science:Materials International 2020年第4期30卷 494-501页

作者： Angélica M.Castillo-Paz Sandra M.Londo?o-Restrepo Liliana Tirado-Mejía M.A.Mondragón Mario E.RODRíGUEZ-García Grupo de Optoelectrónica Instituto Interdisciplinario de las Ciencias Universidad del Quindío Centro de Investigación y de estudios Avanzados del IPN Departamento de Nanotecnología Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma de México Campus Juriquilla

This work focuses on the changes of raw hydroxyapatite obtained from porcine bones during heat treatment with heating rates of 2.5 and 5.0 °C/min between 600 °C and 1100 °C. High-Resolution transmission electron microscopy(HR-TeM) images showed that raw hydroxyapatite was formed by high-ordered nanometric platelet crystals with a length of around 18 nm and width around 7 nm. High-Resolution scanning electron microscopy(HR-SeM) images evidenced the coalescence phenomena during heating giving. It was found that the growth of the crystals and the transition from nano to a micro-size occurred at around 700 °C. And the changes in the full width at half maximum(FWHM) for the characteristic(002) plane of the X-ray diffraction patterns and the FWHM of the characteristic Raman band at 960 cm-1 for ν1 PO43-exhibited the transition from nano to a micro size, that was confirmed by HR-SeM images and the thermogravimetric(TG) analysis. The porosity of the BIOHAp changes from intra nanometric to intercrystalline.

关键词： Bone composition Hydroxyapatite nanoparticles Mineral composition Porosity formation Raman analysis

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Contribution to the understanding of the performance differences between commercial current collectors in Li–S batteries

引用

Journal of energy Chemistry 2021年第11期30卷 295-306,I0007页

作者： A.Benitez F.Luna-Lama ACaballero e.rodriguez-Castellon J.Morales Dpto.Química Inorgánica e Ingeniería Química Instituto Universitario de Nanoquímica(IUNAN)Universidad de Córdoba14071 CórdobaSpain Dpto.de Química Inorgánica Cristalografía y MineralogíaFacultad de CienciasUniversidad de Málaga29071 MálagaSpain

Lithium–sulfur batteries have been recognised as highly promising next-generation batteries, due to their low cost and high theoretical energy density. Despite numerous advances in this technology over the last decade, its commercialisation is still a challenge that has not yet been achieved. Many efforts have been made to improve the problems that these batteries present, mainly by investigating different cathode manufacturing strategies, testing novel Li anodes, new additives in the electrolytes, and modified separators or interlayers. However, the characteristics of the current collectors used in the preparation of the electrodes have been rarely addressed. Three commercial collectors are commonly used in basic research on Li–S batteries: Al foil, carbon coated Al foil (Al-C), and carbon paper (gas diffusion layer, GDL). In this work, a detailed study of the electrochemical response of these commercial collectors has been carried out. The tests were carried out on two S composites formed by carbons of a different natures, commercial carbon black and synthetic N-doped graphene. In addition, the S impregnation method was different, using either melt diffusion at 155 ℃ or ethylenediamine as S solvent, respectively. In both systems, the results were similar – the electrodes supported on GDL delivered higher specific capacities than those supported on Al and Al-C, with minimal differences between the two. Of the different collector properties examined to explain this behaviour, namely Al corrosion, electrical conductivities, surface-level composition, and surface texture, only the latter had a significant effect in the performance of GDL-based electrodes. SeM images revealed a rough and cracked surface formed by the agglomerated carbon particles that give rise to a complex pore system, predominantly consisting of macropores. All of these features are beneficial for a better anchoring of the active material on the collector surface, in addition to enhancing the wettability of the electrolyte and favouring reaction k

关键词： Current collector Carbon paper Aluminum foil Lithium–sulfur battery

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

electrochemical nucleation and growth of aluminum nanoparticles and leaf-like flat microstructures from reline deep eutectic solvent: effect of temperature and angular speed of working electrode

引用

Transactions of Nonferrous Metals Society of China 2021年

作者： G.Vidal-García C.e.Guinto-Pano I.García-Hernández E.RODRíGUEZ-Clemente P.Morales-Gil M.T.Ramírez-Silva M.Romero-Romo M.Palomar-Pardavé Universidad Autónoma Metropolitana-Azcapotzalco， Departamento de Materiales， Av.San Pablo 180 Col.Reynosa-Tamaulipas Universidad Autónoma Metropolitana-Iztapalapa， Departamento de Química

The main objective of this work was to use reline deep eutectic solvent， containing Al（III） ions， for the electrochemical study of the nucleation and growth of aluminum onto a glassy carbon electrode at different temperatures and angular speeds （ω） of the working electrode. In order to fulfill this， electrochemical and surface characterization techniques were used. It was found that as temperature increased， the onset of the Al（III）;reduction occurred at less negative potentials while the current peak of the voltammograms increased. These indicate that Al thermodynamics and kinetics were favored. Practically， no anodic current was detected due to Al passivation by Al（OH）;（s） and γAl;O;（s）. For ω = 0 r/min the Al deposition chronoamperograms were analyzed by a theoretical model comprising Al 3D diffusion-controlled nucleation and growth and residual water reduction. However， those recorded at different angular speeds were analyzed with a theoretical model where adsorption-desorption and diffusion-controlled nucleation-growth occurred simultaneously. The deposits were characterized by SeM， eDX， XPS and XRD. At ω = 0 r/min， formation of well distributed nanoparticles (（78.1± 9.5） nm) were observed， while at ω = 900 r/min the deposit was formed by multiple 10 μm diameter leaf-like flat microstructures， composed by Al， Al（OH）;（s） and γA;O;（s）.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Phylogenetic endemism of the orchids of Megamexico reveals complementary areas for conservation

引用

Plant Diversity 2022年第4期44卷 351-359页

作者： Brandon e.Gutierrez-rodríguez Marilyn Vasquez-Cruz Victoria Sosa Instituto de ecología AC Carretera Antigua a Coatepec 351El Haya91073 XalapaVeracruzMexico Unidad de Genomica Avanzada Laboratorio Nacional de Genomica para La BiodiversidadCentro de Investigaciony Estudios Avanzados IrapuatoLibramiento Norte Carretera Leon Km.9.636821 IrapuatoGuanajuatoMexico

Orchid diversity provides a unique opportunity to further our understanding of biotic and abiotic factors linked to patterns of richness,endemism,and phylogenetic endemism in many regions.However,orchid diversity is consistently threatened by illegal trade and habitat transformation.Here,we identified areas critical for orchid conservation in the biogeographic province of Megamexico.For this purpose,we evaluated orchid endemism,phylogenetic diversity,and phylogenetic endemism within Megamexico and characterized orchid life forms.Our results indicate that the majority of the regions with the highest estimates of endemism and phylogenetic endemism are in southern Mexico and northern Central America,mostly located on the Pacific side of Megamexico.Among the most important orchid lineages,several belong to epiphytic lineages such as Pleurothallidinae,Laeliinae and Oncidiinae.We also found that species from diverse and distantly related lineages converge in montane forests where suitable substrates for epiphytes abound.Furthermore,the southernmost areas of phylogenetic diversity and endemism of Megamexico are in unprotected areas.Thus,we conclude that the most critical areas for orchid conservation in Megamexico are located in southern Mexico and northern Central America.We recommend that these areas should be given priority by the Mexican system of natural protected areas as complementary conservation areas.

关键词： epiphytes Geophytes Orchids Phylogenetic endemism Weighted endemism

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

Non-human primate pluripotent stem cells for the preclinical testing of regenerative therapies

引用

Neural Regeneration Research 2022年第9期17卷 1867-1874页

作者： Ignacio rodríguez-Polo Rüdiger Behr Research Platform Degenerative Diseases German Primate Center-Leibniz Institute for Primate ResearchGöttingenGermany German Center for Cardiovascular Research(DZHK) Partner Site GöttingenGöttingenGermany

Non-human primates play a key role in the preclinical validation of pluripotent stem cell-based cell replacement therapies.Pluripotent stem cells used as advanced therapy medical products boost the possibility to regenerate tissues and organs affected by degenerative diseases.Therefore,the methods to derive human induced pluripotent stem cell and embryonic stem cell lines following clinical standards have quickly developed in the last 15 years.For the preclinical validation of cell replacement therapies in non-human primates,it is necessary to generate non-human primate pluripotent stem cell with a homologous quality to their human counterparts.However,pluripotent stem cell technologies have developed at a slower pace in non-human primates in comparison with human cell systems.In recent years,however,relevant progress has also been made with non-human primate pluripotent stem cells.This review provides a systematic overview of the progress and remaining challenges for the generation of non-human primate induced pluripotent stem cells/embryonic stem cells for the preclinical testing and validation of cell replacement therapies.We focus on the critical domains of(1)reprogramming and embryonic stem cell line derivation,(2)cell line maintenance and characterization and,(3)application of non-human primate pluripotent stem cells in the context of selected preclinical studies to treat cardiovascular and neurodegenerative disorders performed in non-human primates.

关键词： embryonic stem cells induced pluripotent stem cells non-human primates pluripotent stem cells preclinical regeneration reprogramming translational research

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：