Base de dados geográficos como subsídio à gestão territorial na fazenda experimental da Embrapa Amazônia Oriental, Belém, PA.

bitstream/item/61586/1/CPATU-BPD77.pdfAnexo 4 mapas: Solos da Fazenda Experimental da Embrapa Amazônia Oriental, Belém, PA; Uso atual das terras da Fazenda Experimental da Embrapa Amazônia Oriental, Belém, PA; Restrição legal ao uso da terra da Fazenda Experimental da Embrapa Amazônia Oriental, Belém, PA.Zoneamento agroecológico da Fazenda Experimental da Embrapa Amazônia Oriental, Belém, PA

Effect of articular cartilage proteoglycan depletion on high frequency ultrasound backscatter

AbstractObjective To study the effect of variations of articular cartilage proteoglycans (PG) on high-frequency ultrasound backscatter.Design The study was performed on patellar cartilages of immature and mature rats (N=36). The variation of PG content was induced by enzyme digestion. Control and treated cartilages were explored in vitro using a 55MHz scanning acoustic microscopy, then assessed by histology for the fibrillar collagen organization analysis. The variations of proteoglycan and collagen content were evaluated. Thickness measurements performed on both B-scan images and histologic sections were compared. Ultrasonic radio-frequency signals reflected by the cartilage surface and backscattered from its internal matrix were processed to estimate the integrated reflection coefficient (IRC) and apparent integrated backscatter (AIB).Results Although hyaluronidase treatment of immature and mature cartilages removed approximately 50% of the proteoglycans, the echogenicity level of ultrasound images of degraded cartilages was similar to that of controls. IRC and AIB parameters did not significantly vary. Histologic sections of degraded cartilage displayed no change in collagen fiber organization. The thickness mean values measured by ultrasound in PG-depleted groups were significantly higher than in controls, whereas no significant difference in thickness was detected by histological measurement. The increase in cartilage thickness may potentially be explained by a decrease of speed of sound in PG-depleted cartilages that is more likely subsequent to an increase of water content.ConclusionCurrent results indicate that PG depletion has no significant effect on high frequency ultrasound backscattered from rat patellar cartilage. Ultrasound may provide information about variations of PG content via speed of sound measurement. Copyright 2002 OsteoArthritis Research Society International. Published by Elsevier Science Ltd. All rights reserved

Bandas sintéticas derivadas de modelo de mistura espectral na avaliação da dinâmica da paisagem em assentamento rural na fronteira agrícola amazônica.

Cópia de trabalho editado em CD-ROM

Avaliação da dinâmica da paisagem da ilha do Mosqueiro, município de Belém, Pará.

The municipality of Belém, Pará, Brazil, has an area of about 505 km2 , of which 66% corresponds to the insular region, with the biggest, Mosqueiro Island, contributing 41% of total municipal area. This island presents a very heterogenous landscape in terms of the kind of occupation and economic activities developed due to different edaphic and socio-economic factors. In this study, to characterize the vegetation and land use, TM/Landsat images for 1990 and 1995 were used, with the support of field surveys. A change in 53% of the natural vegetation cover of the study area was observed, were being an average forest area loss of 1 km2 /yr over the period. The analyses permit the proposal to create conservations units and generate information on the dynamics of land use. Thus, the set of the results obtained are potentially important for planning the develoment of various activities on the island and the remote sensing and geoprocessing products and techniques, the tool responsible for a fast and efficient monitoring and control

Zoneamento em área submetida a diferentes impactos antrópicos na Amazônia Oriental.

The study area was the main campus of Embrapa Eastern Amazon, comprising 2706,48 ha located the peryphery of Belém, Pará, Brazil. In order to elaborate a zoning for the ocupation and use of this area, available data and informations of the interest were stored using the geoprocessing system SGI/INPE. The information about land use was obtained through TM/Landsat data of 1995, processed in a SITIM digital image analyser, with use of enhancement and classification techniques, backed by ground truthing. After the storage of the relevant informations in SGI, the zoning was mainly done based on potential use, considering physical and chemical properties of the soil, edaphic limitations and actual land use. Thus information was generated about the land use capacity and recommendations for the six use zones. The information obtained is of great importance as a basis for future administrative action in the study area. From the environmental aspect, the allocation of significant forested areas as conservation units, will contribute to protect a rich biological heritage, essential for the maintenance of environmental quality in the region of Belém

Evolução da cobertura vegetal e uso da terra na área do assentamento rural no sudeste paraense: o caso do projeto de assentamento agroextrativista Praialta e Piranheira.

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