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Preparação de novos eletrodos modificados mistos contendo partículas metálicas e sua utilização em hidrogenações eletrocatalíticas de substratos orgânicos; Preparation of new mixed modified electrodes containing metallic particles and its uses in electrocatalytic hydrogenation of organic substrates

Purgato, Fabiana Lopes da Silva
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 10/10/2005 PT
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A preparação do EM Pd foi escolhida pelo fato de já terem sido estudados em nossos laboratórios os EM Ni e EM Pt. Estes três eletrodos modificados (EMs) foram utilizados nas hidrogenações eletrocatalíticas (HEC) de substratos orgânicos para comparação de suas reatividades. A preparação deste novo eletrodo modificado revestido pelo filme misto poli-[éter alílico do p-(2-etilamônio) benzeno] e co-monômero éter fenil e alílico no suporte de bastão de grafite contendo partículas de Pd foi iniciada com a síntese do éter alílico do p-(2-etilamônio) benzeno a partir da acetamida do p-(2-etilamônio). A utilização do co-monômero éter fenil e alílico na estrutura do filme polimérico se fez na tentativa de espaçar a malha polimérica para conseguir melhorar os resultados das HEC de substratos orgânicos, pois estes teriam maior facilidade de permear (difundir) pela malha e também proporcionar um aumento na quantidade de partículas de paládio incorporadas ao filme. Depois da preparação, utilização e comparação dos EMs Ni, Pd e Pt foram desenvolvidos novos EMs mistos visando aumentar a eficiência nas HEC dos substratos orgânicos. O EM misto Ni/Ni já havia sido preparado e estudado nas HEC mostrando uma eficiência moderada. Preparou-se então os EMs mistos Ni/Pd e Ni/Pt para compará-los com o EM Ni/Ni e com os EMs Ni...

Crystallization of amorphous GaAs films prepared onto different substrates

Campomanes, R. R.; Dias da Silva, J. H.; Vilcarromero, J.; Cardoso, L. P.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 788-792
ENG
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This work reports changes in structural properties produced by thermal annealing of flash evaporated amorphous GaAs films using the micro-Raman scattering and the X-ray diffraction (XRD) techniques. Films of about 1 μm were grown on c-Si and glass substrates. The crystallization process is less effective for samples deposited on c-Si. This could be due to the ordering in the first layers of the film imposed by the oriented Si substrates. We propose that this ordering makes the growth of crystallites in these films more restrained than the growth occurring in the completely amorphous films on glass substrates. © 2002 Elsevier Science B.V. All rights reserved.

Photoluminescence in amorphous (PbLa)TiO3 thin films deposited on different substrates

Rangel, J. H.; Carreño, N. L V; Leite, E. R.; Longo, Elson; Campos, C. E M; Lanciotti, F.; Pizani, P. S.; Varela, José Arana
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 7-12
ENG
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Pb1-xLaxTiO3 thin films, (X=0.0; 13 and 0.27mol%) were prepared by the polymeric precursor method. Thin films were deposited on Pt/Ti/SiO2/Si(111), Si(100) and glass substrates by spin coating, and annealed in the 200-300°C range in an O2 atmosphere. X-ray diffraction, scanning electron microscopy and atomic force microscopy were used for the microstructural characterization of the thin films. Photoluminescence (PL) at room temperature has been observed in thin films of (PbLa)TiO3. The films deposited on Pt/Ti/SiO2/Si substrates present PL intensity greater than those deposited on glass and silicon substrates. The intensity of PL in these thin films was found to be dependent on the thermal treatment and lanthanum molar concentration. © 2002 Elsevier Science B.V. All rights reserved.

Oil wastes as unconventional substrates for rhamnolipid biosurfactant production by Pseudomonas aeruginosa LBI

Nitschke, Marcia; Costa, Siddhartha G. V. A. O.; Haddad, Renato; Gonçalves, Lireny A. G.; Eberlin, Marcos N.; Contiero, Jonas
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 1562-1566
ENG
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Oil wastes were evaluated as alternative low-cost substrates for the production of rhamnolipids by Pseudomonas aeruginosa LBI strain. Wastes obtained from soybean, cottonseed, babassu, palm, and corn oil refinery were tested. The soybean soapstock waste was the best substrate, generating 11.7 g/L of rhamnolipids with a surface tension of 26.9 mN/m, a critical micelle concentration of 51.5 mg/L, and a production yield of 75%. The monorhamnolipid RhaC10C10 predominates when P. aeruginosa LBI was cultivated on hydrophobic substrates, whereas hydrophilic carbon sources form the dirhamnolipid Rha2C10C10 predominantly. © 2005 American Chemical Society and American Institute of Chemical Engineers.

Development of silicon carbide substrates for aerospace applications

Abdalla, Antonio J.; Damião, Álvaro J.; Campos, Elson; Santana, Jerusa G. A.; Vicentini, Marcelo C.; Trevisan, Thiago A.; Inoue, Henrique; Santos, Marcos V. R.; Melo, Francisco C. L.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 31-36
ENG
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Payload and high-tech are important characteristics when the goals are aerospace applications. The development of the technologies associated to these applications has interests that transcend national boundaries and are of strategic importance to the nations. Ultra lightweight mirrors, supports and structures for optical systems are important part of this subject. This paper reports the development of SiC substrates, obtained by pressing, to be applied on embedded precision reflective optics. Different SiC granulometries, having YAG as sintering additive, were processed by: ball milling, drying and deagglomeration, sift, uniaxial and isostatic pressing, and, finally, argon atmosphere sintering at 1900°C. Different porosities were obtained according to the amount of organic material added. Into one side of the samples pellets of organic material were introduced to generate voids to reduce the weight of samples as a whole. The substrates were grinding and polished, looking for a SiC surface having low porosity, as porosity is directly related to light scattering that should be avoided on optical surfaces. Laser surface treatments were applied (using or not SiC barbotine) as a method to improve the surface quality. The samples were characterized by optical and laser confocal microscopy...

Structural and electrical properties of LaNiO3 thin films grown on (100) and (001) oriented SrLaAlO4 substrates by chemical solution deposition method

Pontes, D. S L; Pontes, F. M.; Pereira-Da-Silva, Marcelo A.; Berengue, O. M.; Chiquito, A. J.; Longo, Elson
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 8025-8034
ENG
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LaNiO3 thin films were deposited on SrLaAlO4 (1 0 0) and SrLaAlO4 (0 0 1) single crystal substrates by a chemical solution deposition method and heat-treated in oxygen atmosphere at 700° C in tube oven. Structural, morphological, and electrical properties of the LaNiO 3 thin films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), and electrical resistivity as temperature function (Hall measurements). The X-ray diffraction data indicated good crystallinity and a structural preferential orientation. The LaNiO3 thin films have a very flat surface and no droplet was found on their surfaces. Samples of LaNiO3 grown onto (1 0 0) and (0 0 1) oriented SrLaAlO4 single crystal substrates reveled average grain size by AFM approximately 15-30 nm and 20-35 nm, respectively. Transport characteristics observed were clearly dependent upon the substrate orientation which exhibited a metal-to-insulator transition. The underlying mechanism is a result of competition between the mobility edge and the Fermi energy through the occupation of electron states which in turn is controlled by the disorder level induced by different growth surfaces. © 2013 Elsevier Ltd and Techna Group S.r.l.

Influence of surface characteristics on the adhesion of Alcaligenes denitrificans to polymeric substrates

Teixeira, P.; Oliveira, Rosário
Fonte: VSP International Science Publishers Publicador: VSP International Science Publishers
Tipo: Artigo de Revista Científica
Publicado em //1999 ENG
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The adhesion of Alcaligenes denitrificans to several polymeric material was investigated. As the nature of surfaces of the micro-organisms and the substrate materials is an important factor in the adhesion process, characteristics such as the electrokinetic potential and hydrophobicity were also determined and correlated with the capacity of bacterial cells to adhere to solid surfaces. The substrates used were high-density polyethylene (HDPE), polypropylene (PP), poly (vinyl chloride) (PVC), and poly (methyl methacrylate) (PMMA). The electrokinetic potential of the cells and the substrates was determined by measurements of electrophoretic mobility and the hydrophobicity was determined by contact angle measurements. All the substrates studied as well as the bacterial strain have a negative zeta potential, which means that adhesion is not mediated by electrostatic interactions. As far as hydrophobicity is concerned, PP is the most hydrophobic material, PMMA is the least hydrophobic, whereas HDPE and PVC present an intermediate behavior. As bacterial cells are hydrophilic, adhesion is favored to PP; therefore, this substrate material seems to be the one that promotes a stronger adhesion and the development of the most stable biofilm for use as a biomass carrier in denitrifying inverse fluidized bed reactors. This was confirmed by the results of adhesion tests. In this way...

Deposition of conductive materials on textile and polymeric flexible substrates

Silva, Nuno Lacerda; Gonçalves, L. M.; Carvalho, Helder
Fonte: Springer US Publicador: Springer US
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
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This paper describes the study, analysis and selection of textile and similar materials to be used as flexible substrates for thin conductive film deposition, in the context of integrating electronics into textiles. Kapton® polyimide was chosen as reference substrate material, was characterized regarding mechanical and electrical properties and was used as a basis for a comparison with several textile substrates. Samples were fabricated using physical vapour deposition (thermal evaporation) to deposit a thin layer of aluminium on top of Kapton and textile substrates. The measurement of electrical resistance of the thin aluminum films was carried out using the Kelvin method. To characterize the mechanical behaviour of the substrate and aluminum film, several mechanical tests were performed and results were compared between Kapton and these textile materials. The chemical composition of the textile substrates and aluminum films as well as the continuity of the films was characterized. This selection process identified the material that was closer to the behaviour of polyimide, a flexible, but non-elastic woven textile coated on both sides with PVC.; FEDER funds in COMPETE program and by FCT, in the project FCOMP-01-0124-FEDER-022674

Production and quality of Anacardium othonianum Rizz. seedlings grown in different substrates

Dornelles,Paulo; Silva,Fabiano Guimarães; Mota,Clenilso Sehnen; Santana,João das Graças
Fonte: Sociedade Brasileira de Fruticultura Publicador: Sociedade Brasileira de Fruticultura
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
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This study aimed to evaluate the effect of substrate on growth, emergence, nutrition, and quality of Anacardium othonianum Rizz. (cerrado cashew tree) seedlings. The experiment was conducted in a greenhouse at the Plant Tissue Culture Laboratory on the Rio Verde campus. The following substrates were used: 1) Bioplant®, 2) Mecplant® (MP) + carbonized rice husk (CRH) (7:3), 3) fine-grained vermiculite (FGV), 4) FGV+CRH (3:1), 5) FGV+CRH (1:1), 6) FGV+CRH (1:3), and 7) sugarcane bagasse (SB) + sugarcane mill filter cake (FC) (3:2). Emerged seedlings were counted at 2-day intervals for 38 days following emergence of the first seedling. At 39, 64, and 89 days after seeding (DAS), the following variables were measured: stem length (SL), stem diameter (SD), and number of leaves (NL). Accumulated dry weight, quality indices, and leaf macro- and micronutrient levels were determined at 89 DAS. Plants grown in the FGV and FGV+CFH (1:3) substrates had shorter stem lengths than the plants grown in other substrates. Increases in seedling growth were smaller between 64 and 89 DAS compared to the initial period of the experiment. The highest leaf N concentrations were found in the SB+FC substrate treatment group; P and K concentrations were higher for the MP+CRH (7:3)...

Specific fluorogenic substrates for neprilysin (neutral endopeptidase, EC 3.4.24.11) which are highly resistant to serine- and metalloproteases

Medeiros,M.A.S.; França,M.S.F.; Boileau,G.; Juliano,L.; Carvalho,K.M.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/1997 EN
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Two intramolecularly quenched fluorogenic peptides containing o-aminobenzoyl (Abz) and ethylenediamine 2,4-dinitrophenyl (EDDnp) groups at amino- and carboxyl-terminal amino acid residues, Abz-DArg-Arg-Leu-EDDnp (Abz-DRRL-EDDnp) and Abz-DArg-Arg-Phe-EDDnp (Abz-DRRF-EDDnp), were selectively hydrolyzed by neutral endopeptidase (NEP, enkephalinase, neprilysin, EC 3.4.24.11) at the Arg-Leu and Arg-Phe bonds, respectively. The kinetic parameters for the NEP-catalyzed hydrolysis of Abz-DRRL-EDDnp and Abz-DRRF-EDDnp were Km = 2.8 µM, kcat = 5.3 min-1, kcat/Km = 2 min-1 µM-1 and Km = 5.0 µM, kcat = 7.0 min-1, kcat/Km = 1.4 min-1 µM-1, respectively. The high specificity of these substrates was demonstrated by their resistance to hydrolysis by metalloproteases [thermolysin (EC 3.4.24.2), angiotensin-converting enzyme (ACE; EC 3.4.24.15)], serineproteases [trypsin (EC 3.4.21.4), a-chymotrypsin (EC 3.4.21.1)] and proteases present in tissue homogenates from kidney, lung, brain and testis. The blocked amino- and carboxyl-terminal amino acids protected these substrates against the action of aminopeptidases...

Detection of S1-P1 and S3-P3 interactions between papain and four synthetic substrates

Papamichael,Emmanuel M; Roustas,Michael K; Bieth,Joseph G
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1999 EN
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In this study, the S1 - P1 and S3 - P3 interactions between papain and four synthetic peptide substrates were found as to be important. The values of Km were estimated as to be practically identical between these substrates; this latter is supporting the conclusions obtained by considering the estimated values of other kinetic parameters. Nevertheless, based on the estimated kcat and/or k cat/Km parameters of the used substrates, we concluded that an aromatic ring at the P3 position, and a positively charged side chain of the residue at the P1 position of the synthetic substrates were favored considerably their interaction with papain.

Ex vitro acclimatization of Cattleya forbesii and Laelia purpurata seedlings in a selection of substrates

Seidel Júnior,Donato; Venturieri,Giorgini Augusto
Fonte: Editora da Universidade Estadual de Maringá - EDUEM Publicador: Editora da Universidade Estadual de Maringá - EDUEM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2011 EN
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Four substrates were compared (peat, no. 2 gravel only, mixture of no. 2 gravel and peat at a 3:1 ratio, and xaxim) for use in ex vitro growth of Cattleya forbesii and Laelia purpurata - Orquidacea. A substrate x species interaction was observed for the variables vigor and height, showing that each species has its own specificity for substrate. For C. forbesii, xaxim placed first in two of the four assessed parameters. Next came the gravel:peat substrates and peat in the second position for two parameters and in third place for two. In last place was gravel, which was in fourth place for all four parameters assessed. For L. purpurata, the substrates with the greatest number of parameters in first and second positions were gravel:peat and peat, both with two first positions, one second and one third. Next was xaxim, which had one second position, two third positions and one fourth. As the last came gravel, which had one second position and three fourth positions. Xaxim was the best substrate for C. forbesii, but could be replaced, with a minor reduction in performance, by the no. 2 gravel:peat mixture. For L. purpurata, the best substrate was no. 2 gravel:peat mixture. The low effectiveness of the no. 2 gravel substrate when compared with no. 2 gravel:peat provides evidence of the importance of organic matter for these orchids.

Evaluation of growth and production of Pleurotus sp. in sterilized substrates

Bernardi,Eduardo; Minotto,Elisandra; Nascimento,José Soares do
Fonte: Instituto Biológico Publicador: Instituto Biológico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 EN
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The gender Pleurotus is also known as oyster mushroom, shimeji or hiratake. Aiming to select the best substrates to cultivate two species of Pleurotus, this work measured vigor, mycelium growth (cm.day-1), fresh mass (g), productivity (%) and biological efficiency (%) of P. sajor-caju (PSC96/03) and P. ostreatoroseus (POR01/06) cultivated in the following substrates: sugarcane bagasse, elephant grass, waste of castor oil plant and pasteurized rice straw. Fungal cultures were recovered in culture medium CDA. For the evaluation of mycelium growth, moist substrates were put into a closed assay tube with sterilized aluminum paper. Then, they were inoculated in 10 mm culture dishes and taken to the incubator at 26 ± 2°C. Mycelium vigor was measured with grades from 1 to 3 according to density. For axenic cultivation, substrates were placed into 250 g flasks of substrate and autoclaved twice at 121°C (1 atm) for 60 minutes, and then inoculated with 3% of spawn. The lineage P. sajor-caju (PSC96/03) showed higher growth rates in relation to P. ostreatoroseus (POR01/06). Substrates showing lower C/N ratio provided more mycelium vigor. Castor oil plant waste based-substrate showed good perspectives to growing P. sajor-caju (PSC96/03).

Seasonal variability of periphyton nutrient status and biomass on artificial and natural substrates in a tropical mesotrophic reservoir

Ferragut,Carla; Rodello,Alexandre Ferreira; Bicudo,Carlos Eduardo de Mattos
Fonte: Associação Brasileira de Limnologia Publicador: Associação Brasileira de Limnologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 EN
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AIM: Study aimed at evaluating the periphytic community seasonal variation, nutrient status and biomass on artificial and natural (Nymphaea spp., Utricularia foliosa Linnaeus) substrates at a shallow mesotrophic reservoir (Ninféias Reservoir) located in the Parque Estadual das Fontes do Ipiranga, São Paulo, southeast Brazil; METHODS: Samplings for physical, chemical and biological characteristics was performed in winter (August-2006), spring (October-2006), summer (January-2007) and autumn (April-2007). Periphyton was collected growing on artificial (microscope glass slides, 28 days colonization) and natural substrate (Nymphaea spp. and Utricularia foliosa). Periphyton attributes studied were: chlorophyll a, dry mass, ash free dry mass, and N and P content; RESULTS: During the study period was recorded the highest values of water transparency and DO in the winter, PO4-P and free CO2 in the spring, temperature and phytoplankton biomass in summer and autumn of DIN. The highest biomass values were recorded in winter and autumn. Periphyton P and N content varied seasonally on the substrates. Nymphaea spp. had the highest periphyton P content in summer, while U. foliosa and artificial substrate presented in the spring. Higher periphyton N content in Nymphaea spp....

Tipos de fertilizações e diferentes substratos na produção de mudas de cafeeiro (Coffea arabica L.) em tubetes; Fertilization methods and different substrates in the production of coffee seedlings (Coffea arabica L.) in containers

Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Artigo de Revista Científica
PT_BR
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With the aim of evaluating the effects of two types of fertilization and different substrates on coffee tree cutting production in containers, two experiments were set up in the Coffee Culture Sector of the Federal University of Lavras-UFLA under greenhouse conditions. The experiments were set up according to a four-replication randomized complete block design. Plots comprised of 17 containers, the five central ones considered as the useful experimental area. In both experiments substrates had the following composition: 60% organic compound, 20% vermiculite and 20% subsoil earth (S1); 60% bovine manure, 20% carbonized rice husk and 20% subsoil earth (S2); 60% bovine manure, 20% vermiculite and 20% subsoil earth (S3); 60% organic compound, 20% carbonized rice husk and 20% subsoil earth (S4); 60% bovine manure, 20% vermiculite and 20% carbonized rice husk (S5); 80% bovine manure and 20% subsoil earth (S6) and 100% commercial substrate constituted of vermiculite and ground pinus bark compounded and enriched (S7). In one of the experiments fertilization of substrates was done by utilizing the osmocote fertilizer (15-10-10 + micronutrients) at the dose of 300 g / 55 liters of substrate, applied uniformly mixed on it. In the other, the basic fertilization was done by means of the following mixture of fertilizers: 1.0 kg of simple superphosphate...

Efeito de substratos e do sombreamento no desenvolvimento de plantas de palmeira-ju??ara Euterpe edulis (Mart.) e palmeira-real Roystonea regia (Kunth); Effect of substrates and shading on development of palm-ju??ara Euterpe edulis (Mart.) e palm-royal Roystonea regia (Kunth) plants

BRAHM, Rafael ??cker
Fonte: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR Publicador: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
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The growth of the species of ju??ara palm Tree Euterpe edulis (Mart.) and royal palm Roystonea regia (Kunth) has no record of studies focusing on south region of Rio Grande do Sul State. It is necessary to identify a system that ensures the proper growth of plants of these species. In this context, these works provide alternatives for producing seedlings with adaptability for family farms of southern half of Rio Grande do Sul. The effect of different substrates on initial growth of the seedlings and the appropriate level of shading for their initial development were determined. The seedlings were grown on Esta????o Experimental Cascata, Embrapa Clima Temperado. The experiments reported in Chapters I determine the effect of different substrates. The seedlings grew from seeds originated in a family farm located in the municipalities of Tabai and Pelotas, RS. A combination of different substrates was used, represented by the treatments T1 - Plantmax??, T2 - forest soil, T3 - clayey soil, T4 - forest soil:clayey soil 1:1 (v:v), T5 - forest soil:carbonized rice husk 3:1 (v:v), T6 - forest soil:carbonized rice husk 1:1 (v:v), T7 - forest soil:rice husk in natura 1:1 (v:v), T8 - clayey soil:carbonized rice husk 3:1 (v:v), T9 - clayey soil:carbonized rice husk 1:1 (v:v)...

Dinámica estacional del ensamble de aves de un bosque norpatagónico de lenga (Nothofagus pumilio) y su relación con la disponibilidad de sustratos de alimentación; Seasonal dynamics of a birdassemblage in the north Patagonian Lenga (Nothofagus pumilio) forest and its relationship with the availabilioty of foraging substrates

Becerra Serial, Rodrigo M.; Grigera, Dora
Fonte: Aves Argentinas / Asociación Ornitológica del Plata Publicador: Aves Argentinas / Asociación Ornitológica del Plata
Tipo: info:eu-repo/semantics/article; artículo; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em /12/2005 SPA
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Se estudió la dinámica estacional de la composición específica y de la abundancia de las aves de un bosque de lenga en el valle del Ñireco, Parque Nacional Nahuel Nuapi, Argentina, y de los patrones de uso de los sustratos de alimentación. La diversidad específica y la densidad del ensamble fueron mucho más muy bajas en invierno que en primavera y verano. La riqueza de especies fue mínima en invierno, pero no presentó variaciones importantes entre las demás estaciones del año. Casi todas las especies presentes en invierno (7 de un total de 23) usaron principalmente los troncos y las ramas para alimentarse, dado que estos sustratos están disponibles y poseen alimento todo el año. Las aves ausentes en invierno utilizaron para alimentarse principalmente el suelo y, en menor medida que este sustrato, el follaje y el aire. Las usuarias del suelo no pueden permanecer en invierno en el área porque ese sustrato, a pesar de contener alimento, se encuentra cubierto de nieve. La falta de alimento y no la disponibilidad del sustrato de alimentación determinaría la ausencia invernal de las especies usuarias del follaje y del aire. El ensamble estudiado está compuesto mayormente por especies restringidas en el uso de los sustratos...

Dinámica estacional del ensamble de aves de un bosque norpatagónico de lenga (Nothofagus pumilio) y su relación con la disponibilidad de sustratos de alimentación; Seasonal dynamics of a birdassemblage in the north Patagonian Lenga (Nothofagus pumilio) forest and its relationship with the availabilioty of foraging substrates

Becerra Serial, Rodrigo M.; Grigera, Dora
Fonte: Revista de Ornitología Neotropical; Aves Argentinas; Aves Argentinas / Asociación Ornitológica del Plata Publicador: Revista de Ornitología Neotropical; Aves Argentinas; Aves Argentinas / Asociación Ornitológica del Plata
Tipo: info:eu-repo/semantics/article; artículo; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em /12/2005 SPA
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Se estudió la dinámica estacional de la composición específica y de la abundancia de las aves de un bosque de lenga en el valle del Ñireco, Parque Nacional Nahuel Nuapi, Argentina, y de los patrones de uso de los sustratos de alimentación. La diversidad específica y la densidad del ensamble fueron mucho más muy bajas en invierno que en primavera y verano. La riqueza de especies fue mínima en invierno, pero no presentó variaciones importantes entre las demás estaciones del año. Casi todas las especies presentes en invierno (7 de un total de 23) usaron principalmente los troncos y las ramas para alimentarse, dado que estos sustratos están disponibles y poseen alimento todo el año. Las aves ausentes en invierno utilizaron para alimentarse principalmente el suelo y, en menor medida que este sustrato, el follaje y el aire. Las usuarias del suelo no pueden permanecer en invierno en el área porque ese sustrato, a pesar de contener alimento, se encuentra cubierto de nieve. La falta de alimento y no la disponibilidad del sustrato de alimentación determinaría la ausencia invernal de las especies usuarias del follaje y del aire. El ensamble estudiado está compuesto mayormente por especies restringidas en el uso de los sustratos...

Vertically standing Ge nanowires on GaAs(110) substrates

Song, Man Suk; Jung, Jae Hun; Kim, Yong; Wang, Y; Zou, Jin; Joyce, Hannah J; Gao, Qiang; Tan, Hoe Hark; Jagadish, Chennupati
Fonte: Institute of Physics Publishing Publicador: Institute of Physics Publishing
Tipo: Artigo de Revista Científica
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The growth of epitaxial Ge nanowires is investigated on (100), (111) B and (110) GaAs substrates in the growth temperature range from 300 to 380°C. Unlike epitaxial Ge nanowires on Ge or Si substrates, Ge nanowires on GaAs substrates grow predominantly a

Aquatic macroinvertebrate colonization of artificial substrates in low-order streams; Colonização de substratos artificiais por macroinvertebrados aquáticos em córregos de baixa ordem

Leite-Rossi, Luciene Ap.; Universidade Federal de São Carlos; Rodrigues, Gisele Nunes; Universidade Federal de São Carlos; Trivinho-Strixino, Susana; Universidade Federal de São Carlos
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 17/04/2015 ENG
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http://dx.doi.org/10.5007/2175-7925.2015v28n3p69One of the factors that determine the presence and establishment of the benthic biota in aquatic ecosystems is the nature of the available substrate. The colonization of artificial substrates for macroinvertebrates has often been used as a tool in environmental assessments by operating facilities it provides. The present study aimed to determine whether or not macrofauna exhibit selectivity for different types of artificial substrates. Colonization recipients containing different substrates were immersed in three small streams in the region of São Carlos, São Paulo, for 30 days. To evaluate selectivity for each substrate type, a comparison was made between the colonizing and resident fauna in each stream. Data analysis indicated that macroinvertebrate fauna exhibited selectivity for different artificial substrate types in the streams studied. These results point to the need for knowledge of water body characteristics prior to study (e. g., types of substrates in stream beds and surrounding vegetation, etc.) in order to choose the types that are better colonized by specific groups of macroinvertebrates.; http://dx.doi.org/10.5007/2175-7925.2015v28n3p69A natureza do substrato é um dos fatores que determina a presença e o estabelecimento da biota bentônica nos ecossistemas aquáticos. A colonização de substratos artificiais por macroinvertebrados em avaliações das comunidades tem sido frequentemente utilizada como ferramenta pelas facilidades operacionais que oferece. O presente estudo teve por finalidade verificar se há...