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Agricultural Sciences 2013年第12期4卷 654-665页

作者： marcela silva-gomez John A. Quiroz-Gamboa Francisco C. Yepes María F. Maya Adriana Santos Lilliana M. Hoyos-Carvajal Jardín Botánico de San Andrés Universidad Nacional de Colom-bia Sede Caribe San Andrés Colombia Universidad Nacional de Colombia Sede Medellín Medellín Colombia

An evaluation of the incidence of Crypticerya multicicatrices and Maconellicoccus hirsutus in Colombian Seaflower Biosphere Reserve in San Andrés, Providence and Santa Catalina islands, from mid-August to mid-November 2012 was made. 38 locations were sampled, and 34% of sites tested show an incidence of C. multicicatrices oscillating between a range of 80%-100%, 24% with 40%-80% of incidence, 18% between 10%-40% and 24% with a range of 0%-10%. The occurrence of M. hirsutus fluctuated between 0.5% and 17%. There were seven genera of ants associated C. multicicatrices and 94 hosts of this agriculturally important insect and we found high incidence of associated sooty mold in C. multicicatrices hosts. Observations also contained some developmental stages of C. multicatrices.

关键词： Colombia’s Caribbean Insular Pink Hibiscus Mealybug Multicicatrices Fluted Scale Sap Sucking Insects Honey Dew Sooty Mold

Diversity of mycorrhizal fungi and soil indicative species in coastal plantations of northeast Brazil

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Journal of Forestry Research 2021年第3期32卷 1203-1211页

作者： Olmar Baller Weber Maria Cátia Barroso da silva Cristiane Figueira da silva Diva Correia Deborah dos Santos Garruti marcela Claudia Pagano Embrapa Agroindústria Tropical Rua Dra.Sara Mesquita2270PiciFortalezaCeará60511-110Brazil Centro de Ciências E Tecnologia Universidade Estadual Do CearáAv.Dr.Silas Munguba1700Campus do ItaperiFortaleza 60740-000Brazil Universidade Federal Rural Do Rio de Janeiro BR 465 Km 7 Seropédica RJSeropédicaRio de Janeiro CEP 23890-000Brazil Universidade Federal de Minas Gerais Av.Antonio Carlos6627PampulhaBelo Horizonte 31270-001Brazil

The aim of this work was to evaluate arbuscular mycorrhizal(AM)fungi as soil indicators and the mycorrhization of native and exotic tree species planted in the Acaraúbasin,a transition area from the coast to the Brazilian semiarid *** with 6-year-old trees of four native and three non-native species as well as one non-forested area were evaluated in terms of the diversity of AM fungi in the mycorrhizosphere and the root colonization by AM and ectomycorrhizal(EcM)***-four AM fungi were identified;Claroideoglomus etunicatum,Glomus sinuosum,Paraglomus albidum,Acaulospora laevis,and Acaulospora brasiliensis were abundant in the forest ***,dominance,evenness and richness indices of AM fungi were higher in plots with native *** root samples were colonized by AM fungi and only A nadenanthera colubrina,Acacia mangium,Casuarina equisetifolia and Eucalyptus urophylla formed associations with EcM *** morphotypes served as soil indicators for coverings with the native species Astronium fraxinifolium and Colubrina *** species may favor the proliferation of rarer AM *** fungi–plant relationships may be important in the management of forest systems,and the evidence with mycorrhizal associations allows the inclusion of Brazilian species in tropical reforestation.

关键词： Acacia mangium Arbuscular mycorrhizal fungi Brazilian species Casuarina equisetifolia Ectomycorrhizal fungi Eucalyptus urophylla

Analysis of the microbial communities in soils of different ages following volcanic eruptions

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Pedosphere 2020年第1期30卷 126-134页

作者： marcela HERNáNDEZ marcela CALABI Ralf CONRAD Marc G.DUMONT Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Str.10Marburg 35043(Germany) Scientific and Technological Bioresource Nucleus Universidad de La FronteraTemuco(Chile) School of Biological Sciences University of SouthamptonSouthampton SO171BJ(UK)

Volcanism is a primary process of land *** provides a model for understanding soil-forming processes and the role of pioneer bacteria and/or archaea as early colonizers in those new *** objective of this study was to identify the microbial communities involved in soil *** was extracted from soil samples from the Llaima volcano in Chile at sites destroyed by lava in different centuries(1640,1751,and 1957).Bacterial and archaeal 16 S r RNA genes were analyzed using quantitative polymerase chain reaction(q PCR)and Illumina Mi Seq *** showed that microbial diversity increased with soil age,particularly between the 1751 and 1640 *** archaeal communities,Thaumarchaeota was detected in similar abundances in all soils,but Euryarchaeota was rare in the older *** analysis of bacterial 16 S r RNA genes showed high abundances of Chloroflexi(37%),Planctomycetes(18%),and Verrucomicrobia(10%)in the youngest *** and Acidobacteria were highly abundant in the older soils(16%in 1640 and 15%in 1751 for Acidobacteria;38%in 1640 and 27%in 1751 for Proteobacteria).The microbial profiles in the youngest soils were unusual,with a high abundance of bacteria belonging to the order Ktedonobacterales(Chloroflexi)in the 1957 soil(37%)compared with the 1751(18%)and 1640(7%)*** this study,we show that there is a gradual establishment of the microbial community in volcanic soils following an eruption and that specific microbial groups can colonize during the early stages of recovery.

关键词： 16S rRNA gene extreme environment high-throughput sequencing Ktedonobacterales microbial diversity pioneer microbe recolonization soil formation volcanic deposit

MnFe2O4 nanoparticles as new catalyst for oxidative degradation of phenol by peroxydisulfate

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Journal of Environmental Sciences 2017年第3期29卷 269-277页

作者： marcela Stoia Cornelia Muntean Bogdan Militaru Faculty of Industrial Chemistry and Environmental Engineering Politehnica University TimisoaraR0-300223 TimisoaraRomania Research Institute for Renewable Energy Politehnica University TimisoaraRO-300006TimisoaraRomania

Manganese ferrite nanopowder was prepared by thermal decomposition at 400℃ of the gel synthesized from manganese and iron nitrates and polyvinyl alcohol. X-ray diffractometry evidenced that manganese ferrite was formed as single crystalline phase at this temperature. Scanning electron microscope images evidenced the formation of very fine spherical particles （d 〈 11 nm） of manganese ferrite, with specific surface area of 147 m2/g. The powder obtained at 400℃ was used as a catalyst for the oxidative degradation of phenol in aqueous solutions, in the presence of potassium peroxydisulfate as oxidant. High phenol removal efficiencies above 90% were reached at： pH 3-3.5, phenol initial concentration around 50 mg/L, peroxydisulfate：phenol mass ratio 10：1, and catalyst dose 3 g/L. Total organic carbon measurements showed that the degradation of phenol goes, under these conditions, to mineralization in an extent of 60%.

关键词： Manganese ferriteNanoparticlesPhenolPeroxydisulfateCatalytic oxidation

Variations in productivity and wood properties of Amazonian tachi-branco trees planted at diff erent spacings for bioenergy purposes

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Journal of Forestry Research 2021年第1期32卷 211-224页

作者： Marilene Olga dos Santos silva marcela Gomes da silva Lina Bufalino Maíra Reis de Assis Delman de Almeida Goncalves Paulo Fernando Trugilho Thiago de Paula Protásio Rural Federal University of Amazonia/UFRA Perimetral Ave.Terra FirmeBelémPA 66077-830Brazil Federal University of Lavras/UFLA Francisco Sales St.CentroLavrasMG 37200-000Brazil Brazilian Agricultural Research Corporation/Eastern Amazonia Embrapa Dr.Enéas Pinheiro BySt.MarcoBelémPA 66095-903Brazil Rural Federal University of Amazonia/UFRA PA-275 Rd.Zona RuralParauapebasPA 68515-000Brazil

Marilene Olga dos Santos silva 1·marcela Gomes da silva 1·LTachi-branco(Tachigali vulgaris,*** da silva&***)is a leguminous tree species native to the Amazon rainforest that has drawn attention for its remarkably fast growth,a required trait for biomass/bioenergy *** evaluations of biomass production and wood properties of *** planted in homogeneous plantations at diff erent spacings in the Amazonian state of Pará,Brazil,biomass of 7-year-old trees was quantifi ed for individual trees and the entire *** was also sampled to assess properties relevant to bioenergy *** choice for spacing dimension for planting nonclonal *** should consider whether the priority is greater productivity per tree,achieved with greater spacings(9.0 m 2 and 12.0 m 2),or productivity per area,achieved with closerina Bufalino 1·Maíra Reis de Assis 2·Delman de Almeida Goncalves 3·Paulo Fernando Trugilho 2·Thiago de Paula Protásio 4 spacings(6.0 m 2 and 7.5 m 2).Genetic variability of the *** seed stand and/or high heritability of wood traits overcame the eff ect of diff erent spacing on all morphological,physical,chemical and energetic properties of *** *** species has moderate basic density when cultivated at spacings larger than 6 m 2 and net heating value above 7.95 MJ/kg,which is suitable for bioenergy *** high variation in wood properties within tree spacing is strongly indicative of great potential for genetic *** fast growth and the suitable moderate wood basic density confi rm the outstanding potential of homogeneous plantations of *** for providing wood for bioenergy.

关键词： Basic density Heating value Planting density Tachigali vulgaris

Impact Sensitivity in Respect of the Crystal Lattice Free Volume and the Characteristics of Plasticity of Some Nitramine Explosives

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含能材料 2015年第12期23卷 1186-1191页

作者： Svatopluk Zeman marcela JUNGOV Qi-Long YAN Institute of Energetic Materials Faculty of Chemical TechnologyUniversity of Pardubice

The relationship between the crystal lattice free volume,ΔV,and impact sensitivity,E_(dr),of ten nitramines has been analyzed. It was found that this relationship is not uniquely determined,i. e. it is not given only by their own ΔV values but fundamentally by the type and intensity of the intermolecular forces in the nitramine crystals. Also,relationships between the E_(dr)values,on the one hand,and bulk modulus,K,and shear modulus,G,on the other,have been the subject of discussion not only for pure cyclic nitramines but also for their PBXs,bonded by a poly-fluoro binder. The closest linear correlation exists between the E_(dr)values and dimensionless K·G^(-1) ratio which indicates the plasticity range. A similar relationship is valid also for the ΔV values. Relationships of the E_(dr) and / or ΔV values with the shear modulus or to the K·G^(-1) ratio reflect an unusual behavior of ε-HNIW to which the published morphological instability of this particular HNIW version might also be related.

关键词：爆破器料含能材料烟火器材材料学

Determinant variables on the isotopic values of particulate organic matter in a neotropical floodplain

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Journal of Oceanology and Limnology 2024年第4期42卷 1173-1185页

作者： Vinícius de ANDRADE URBANO Matheus MAXIMILIAN RATZ SCOARIZE Gustavo HENRIQUE ZAIA ALVES Driele DELANIRA-SANTOS marcela da silva CAETANO Evanilde BENEDITO Departamento de Biologia(DBI) Laboratório de Ecologia EnergéticaUniversidade Estadual de Maringá(UEM)Maringá87020-900Brasil Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais(PEA) Universidade Estadual de Maringá(UEM)Maringá87020-900Brasil Departamento de Biologia Geral Universidade Estadual de Ponta Grossa(UEPG)Campus UvaranasPonta Grossa 84030-900Brasil Australian Rivers Institute(ARI) Griffith UniversityNathan QLD 4111Australia

Particulate organic matter(POM)is an important energy source for aquatic consumers,understanding its origin and composition is essential for understanding the energetic dynamics of aquatic *** aim of this study was to analyze the relationship between POM and phytoplankton(isotopic values and chlorophyll concentration)and abiotic variables during dry and rainy *** was conducted in rivers and lagoons in the floodplain of the Upper Paraná*** found a greater difference in ^(δ13)C values of POM between sampling points than between seasons,indicating that the composition of regional sources influences the composition of POM more than dry and rainy *** addition,the concentration of chlorophyll during the dry season was positively correlated with ^(δ13)C values during that rainy ***,we found a relationship between factors limiting the growth of phytoplankton and ^(δ13)C values of POM,such as phosphate ions,indicating that variables that regulate phytoplankton growth tend to influence the composition of POM in river ***,maintaining the variables that regulate the phytoplankton community is of fundamental importance for the composition of POM,an important energy source in aquatic environments.

关键词： freshwater wetland stable isotopes food web subtropical environment

Spontaneous bacterial peritonitis:A severe complication of liver cirrhosis

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World Journal of Gastroenterology 2009年第44期15卷 5505-5510页

作者： Jan Lata Oldich Stiburek marcela Kopacova Department of Internal Medicine and Hepatogastroenterology University Hospital and Faculty of MedicineMasaryk University637 00 BrnoCzech Republic 2nd Department of Medicine Charles University in PrahaFaculty of Medicine at Hradec KraloveUniversity Teaching Hospital500 05 Hradec KráloveCzech Republic

This report presents a survey of current knowledge concerning one of the relatively frequent and severe complications of liver cirrhosis and associated ascites-spontaneous bacterial peritonitis. Epidemiology,aetiology... 详细信息

关键词： Liver cirrhosis Portal hypertension Ascites Spontaneous bacterial peritonitis

Towards full predictions of temperature dynamics in McNary Dam forebay using OpenFOAM

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Water Science and Engineering 2013年第3期6卷 317-330页

作者： Yu-Shi WANG marcela POLITANO Ryan LAUGHERY IIHR-Hydroscience and Engineering The University of Iowa Iowa City U.S. Army Corps of Engineers Walla Walla District Walla Walla

Hydroelectric facilities impact water temperature; low velocities in a reservoir increase residence time and enhance heat exchange in surface layers. In this study, an unsteady three-dimensional model was developed to predict the temperatm＇e dynamics in the McNary Dam forebay. The model is based on the open-source code OpenFOAM. RANS equations with the Boussinesq approximation were used to solve the flow field. A： realizable k-ε model that accounts for the production of wind turbulence was developed. Solar radiation and convective heat transfer at the free surface were included. The result of the model was compared with the field data collected on August 18, 2004. Changes in diurnal stratification were adequately predicted by the model. Observed vertical and lateral temperature distributions were accurately captured. Results indicate that the model can be used as a numerical tool to assess structural and operational alternatives to reduce the forebay temperature.

关键词： three-dimensional numerical simulation," water temperature," reservoir," thermal dynamics OpenFOAM McNary Dam forebay

Promising psyllium-based composite containing TiO2 nanoparticles as aspirin-carrier matrix

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Progress in Natural Science:Materials International 2014年第3期24卷 205-209页

作者： marcela-Corina Rosu Ioan Bratu National Institute for Research and Development of Isotopic and Molecular Technologies

Composite nanomaterials represent a new trend in the biomedical field. Coupling inorganic/organic constituents with non-toxicity/biocompatibility properties leads to develop the new systems having special characteristics that can be used in various bio-applications. This paper describes the preparation and characterization of psyllium-based composites containing TiO2 nanoparticles in order to develop new therapeutic strategies for aspirin drug delivery. The structural characteristics of obtained materials were investigated by FTIR spectroscopy. The UV–vis spectrophotometric analysis was performed to evaluate the aspirin release behavior under different pH conditions at 37 1C. Combining psyllium(as an excellent source of fiber) with TiO2 inorganic unit(as vehicle of aspirin) it was found that polymeric-TiO2networks have promising potential for controlled aspirin release as therapeutic agent.

关键词： Psyllium Titanium dioxide Aspirin In vitro release