Scanning Electron Microscopes
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. CO-SITE MICROSCOPY: NEW POSSIBILITIES IN THE ORE CHARACTERIZATION / MICROSCOPIA CO-LOCALIZADA: NOVAS POSSIBILIDADES NA CARACTERIZAÇÃO DE MINÉRIOS
Computer-controlled microscopes with digital image acquisition and analysis led to the creation of a new field, called Digital Microscopy. Digital Microscopy not only allows a certain degree of automation but also has brought new possibilities to microstructural characterization. One of these new and promising possibilities is Co- Site Microscopy, that links
Publicado em: 2007
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14. Efeitos do campo eletromagnetico em celulas e bacterias / Effects of electromagnetic field in cell and bacteria
This research work studies some effects of an electromagnetic field applied on bacteria. The chosen bacterium is quite known in the scientific world, the Escherichia coli (E. coli). The experimental part was divided into the quantitative, qualitative and morphologic analysis on the life of bacterium Escherichia coli. The electromagnetic circuit was generated
Publicado em: 2007
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15. CARBON NANOTUBES DECORATED WITH COBALT PARTICLES / NANOTUBOS DE CARBONO DECORADOS COM PARTÍCULAS DE COBALTO
Carbon nanotubes since they are observed for the first time have been attracted attention due to their structure and unique electronic properties. Many applications, as support materials for catalysts, are proposed because of their aspect ration and good electrical conductivity. These properties favor a better dispersion and stabilization of the metallic nan
Publicado em: 2007
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16. Nanomanipulation and characterization of individual nano-objects for in situ experiments of electron microscopy / Nanomanipulação e caracterização de nano-objetos individuais por experimentos in situ de microscopia eletronica
It is expected that, in the future, high-technology devices should be based on new and unexpected physical and chemical properties of nanometric objects. Many applications require nano-objects to be selectively positioned at well-defined positions of a device. However, the well-established methods of physical manipulation used in the macroscopic scale are no
Publicado em: 2007
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17. Estudo da formação de rastos nucleares em polímeros / Study of the Nuclear Tracks Formation in Polymers
The research in the field of material modification with ion implantation has greately improved, stimulated by technological applications in biology, medicine, electronics and other related areas. One of the correlated aspects in understanding these new materials is the identification and characterization of the damage produced by ion beam irradiation. In thi
Publicado em: 2007
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18. Avaliação da capacidade de remoção da smear layer das paredes de canais instrumentados utilizando diferentes substancias quimicas auxiliares ao preparo quimico-mecanico : estudo in vitro / In vitro assessment of the ability to remove the smear layer in instrumented root canals with different irrigating substances
O presente trabalho avaliou, in vitra, a capacidade de remoção da smear layer das paredes dos canais radiculares após o preparo químico-mecânico realizado com diferentes substâncias químicas auxiliares. Selecionou-se 54 dentes humanos unirradiculares, com canais retos e ápices formados, divididos em grupos seguindo o protocolo de irrigação: G1: NaO
Publicado em: 2005
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19. Microhardness and chemical composition of human tooth
Hardness of human tooth, both in enamel and dentin, has been measured at different sites using a Vicker's diamond. In this work we show that these values are almost constant all along the enamel and dentin thicknesses. Indentations were done from outer enamel surface to inner dentin layer, going through the enamel-dentin junction, both in transverse and long
Materials Research. Publicado em: 2003-06
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20. Measuring the Size of Biological Nanostructures with Spatially Modulated Illumination MicroscopyD⃞
Spatially modulated illumination fluorescence microscopy can in theory measure the sizes of objects with a diameter ranging between 10 and 200 nm and has allowed accurate size measurement of subresolution fluorescent beads (∼40–100 nm). Biological structures in this size range have so far been measured by electron microscopy. Here, we have labeled sites
The American Society for Cell Biology.
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21. The canine vomeronasal organ.
The vomeronasal organ was studied in mature dogs with the optical, transmission electron, and scanning electron microscopes. The canine vomeronasal complex is structurally well developed. Large blood vessels are present deep to both the lateral, 'non-receptor' and medial, 'receptor' epithelia. In addition to the unmyelinated vomeronasal nerves in the lamina
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22. Life Cycle of Neurospora crassa Viewed by Scanning Electron Microscopy
Scanning electron microscopy was used to examine the major stages of the life cycle of two wild-type strains of Neurospora crassa Shear and Dodge (St. Lawrence 3.1a and 74A): mycelia, protoperithecium formation, perithecia, ascospores, ascospore germination and outgrowth, macro and microconidia, and germination and outgrowth of macroconidia. Structures seen
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23. An electron microscopical study of epiplexus and supraependymal cells in the prenatal rat brain following a maternal injection of 6-aminonicotinamide.
Epiplexus and supraependymal cells in the lateral ventricles of both normal and experimental prenatal rats were studied with the scanning and transmission electron microscopes. In normal rats, the epiplexus cells, which were predominantly spindle shaped, displayed long filopodial processes inserted into the palisade of microvilli of the choroid epithelium; t
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24. The rete testis of birds.
The rete testis in the domestic fowl (Gallus gallus domesticus), Japanese quail (Coturnix coturnix japonica), guinea-fowl (Numida meleagris galeata) and drake (Anas platyrhynchos) was studied histologically and with both the scanning and transmission electron microscopes. All the birds have rete epithelial cells varying between squamous and high cuboidal. A