scholarly journals Mercury and organic carbon distribution in six lakes from the North of Rio de Janeiro State

2004 ◽  
Vol 47 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Wanderson Primo de Sousa ◽  
Carlos Eduardo Veiga de Carvalho ◽  
Claudia Calasans Veiga de Carvalho ◽  
Marina Satika Suzuki
Keyword(s):  
Organic Carbon ◽  
Rio De Janeiro ◽  
Gold Mining ◽  
Mercury Contamination ◽  
Carbon Distribution ◽  
Mining Areas ◽  
The Past ◽  
The North ◽  
Superficial Sediments ◽  
Janeiro State

The objectives of the study was to evaluate the mercury contamination in sediments of six lagoons located in the north region of Rio de Janeiro State, trying to relate the Hg concentrations with factors that could influence it's mobility, such as organic carbon. The highest values observed in the superficial sediments in lakes like Campelo (349,6 µg.kg -1) suggested a recent Hg input into the system. The correlation Hg/Organic carbon was positive for most areas, indicating that the organic carbon was a significant parameter for Hg retention in this region. The obtained results suggested that the mercury used as fungicide in agriculture lands and in gold mining areas in the past were probably responsible for the contamination of this environment.

scholarly journals Modern processes of palynomorph deposition at lakes of the northern region of the Rio de Janeiro State, Brazil

2010 ◽  
Vol 82 (3) ◽  
pp. 679-690 ◽  
Author(s):  
Cynthia F.P. da Luz ◽  
Ortrud M. Barth ◽  
Cleverson G. Silva
Keyword(s):  
Rio De Janeiro ◽  
Mechanical Damage ◽  
Pollen Grains ◽  
Northern Region ◽  
Palynological Analysis ◽  
The North ◽  
Pollen Types ◽  
Lake Bottom ◽  
Superficial Sediments ◽  
Janeiro State

Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the northeastern wind. At Lagoa do Campelo, a total of 58 pollen types were identified, among which the majority of the pollen grains came from hydrophytes, with the highest concentrations found along the northeastern shore. The southeastern shore showed high percentages of pollen and spores with degraded exine and mechanical damage, due to the transport through the lakeby the currents caused by the wind, confirmed by the depositional trend of damaged palinomorphs along the same direction as the prevailing winds.

Mercury contamination in fish from gold mining areas in Indonesia and human health risk assessment

2006 ◽  
Vol 368 (1) ◽  
pp. 320-325 ◽  
Author(s):  
Zuleica C. Castilhos ◽  
Saulo Rodrigues-Filho ◽  
Ana Paula C. Rodrigues ◽  
Roberto C. Villas-Bôas ◽  
Shefa Siegel ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Human Health ◽  
Health Risk Assessment ◽  
Gold Mining ◽  
Human Health Risk ◽  
Human Health Risk Assessment ◽  
Mercury Contamination ◽  
Mining Areas

scholarly journals Geo-enviromental diagnoses of the são francisco de itabapoana city in the north of Rio de Janeiro state

2020 ◽  
Vol 6 (5) ◽  
pp. 26764-26775
Author(s):  
Graziele Arantes Reis ◽  
Iago Matheus Lopes Macêdo ◽  
Rodson de Abreu Marques
Keyword(s):  
Rio De Janeiro ◽  
The North ◽  
Janeiro State

scholarly journals Glomalin in soil aggregates under different forest and pasture systems in the North of Rio de Janeiro state, Brazil

2020 ◽  
Vol 8 ◽  
pp. 100088
Author(s):  
Alessandro Santos ◽  
Cristiane Figueira da Silva ◽  
Emanuela Forestieri Gama-Rodrigues ◽  
Antonio Carlos Gama-Rodrigues ◽  
Marcus Sales ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Soil Aggregates ◽  
The North ◽  
Janeiro State

ARRANJO POPULACIONAL PARA A VARIEDADE UENF-14 DE MILHO PIPOCA

2017 ◽  
Vol 16 (3) ◽  
pp. 401
Author(s):  
CÁSSIO VITORAZZI ◽  
ANTONIO TEIXEIRA AMARAL JÚNIOR ◽  
LILIAM SILVIA CANDIDO ◽  
ISMAEL LOURENÇO DE JESUS FREITAS ◽  
THIAGO RODRIGUES DA CONCEIÇÃO SILVA
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Rio De Janeiro ◽  
Zea Mays L ◽  
Block Design ◽  
Grain Production ◽  
Maize Population ◽  
The North ◽  
Randomized Complete Block Design ◽  
Janeiro State

 RESUMO - A adequação do arranjo populacional está entre as técnicas que podem maximizar a produtividade da cultura do milho. Daí a importância das pesquisas que buscam estudar o desempenho de cultivares de milho e milhos especiais, a fim de determinar o arranjo de plantas ideal. O objetivo deste trabalho foi avaliar o desempenho da variedade UENF-14, de milho pipoca, cultivada em diferentes arranjos populacionais, na safra e safrinha, para otimizar a recomendação fitotécnica para os produtores rurais do Norte Fluminense. Foram instalados dois experimentos em Campos dos Goytacazes-RJ. Um na safrinha 2011 utilizando a variedade UENF-14 e o híbrido experimental P2 x P9, e o outro na safra 2011-2012, com a variedade UENF-14 e o híbrido comercial IAC-112. O delineamento experimental, nos dois experimentos, foi o de blocos casualizados arranjados em parcelas subsubdivididas, em que as parcelas foram compostas pelos genótipos, as subparcelas constituídas pelos espaçamentos entre linhas de semeadura (0,45, 0,60 e 0,90 m) e as subsubparcelas compostas pelas densidades de plantas (60.000, 75.000 e 90.000 plantas ha-1). A UENF-14 apresentou desempenho superior aos híbridos, demonstrando seu potencial para cultivo na região Norte Fluminense. Houve aumento do rendimento de grãos com a diminuição do espaçamento entre linhas de plantio. Para a variedade UENF-14, a redução do espaçamento entre linhas de plantio foi vantajosa para a produção de grãos, independentemente da época de semeadura.Palavras-chave: Zea mays L., densidade de semeadura, espaçamento entre linhas, épocas de semeadura.  POPULATION ARRANGEMENT FOR THE VARIETY OF POPCORN UENF-14 ABSTRACT - The adequacy of the maize population arrangement is among the most important techniques for obtaining higher yields. Therefore, many researchers have been conducting an attempt to study the performance of corn and specialty corn. The objective was to evaluate the performance of the popcorn variety UENF-14 in different population arrangements, in the harvest season and off-season. Two experiments were carried out in Campos dos Goytacazes, North of Rio de Janeiro State, Brazil, in the off-season 2011, using the UENF-14 variety and the experimental hybrid P2 x P9, and in the season 2011-2012 using UENF-14 and the commercial hybrid IAC-112. The treatments were arranged in randomized complete block design with split plots, in which plots were composed by popcorn genotypes, the subplots consisting of three spacings between sowing lines (0.45, 0.60 and 0.90 m) and the subsubplots composed of three plants per hectare densities (60,000, 75,000 and 90,000 plants.ha-1). The variety UENF-14 presented higher performance than the hybrids, demonstrating its potential for recommendation to the North of Rio de Janeiro State. There was an increase of grain yield by reducing the spacing between the plants rows. The cultivation of the variety UENF-14 reducing the spacing between rows was advantageous for grain production, regardless of planting date.Keywords: Zea mays L., densities of plants, spacing between rows, sowing times.

scholarly journals Tropical Viticulture Diagnosis in the North and Northwest Fluminense

2021 ◽  
Vol 13 (5) ◽  
pp. 171
Author(s):  
Jaomara Nascimento da Silva ◽  
Niraldo José Ponciano ◽  
Paulo Marcelo Souza ◽  
Claudio Luiz Melo de Souza ◽  
Leandro Hespanhol Viana ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Skilled Labor ◽  
Average Area ◽  
Climatic Variations ◽  
The North ◽  
Wine Market ◽  
Production Areas ◽  
Janeiro State ◽  
Outer Environment

Viticulture has proved to be an alternative for farmers in the northen and northwestern Rio de Janeiro State; however, the activity is still very recent and requires the development of agronomic and managerial techniques. Therefore, the objective of this work was to diagnose the production areas and the characteristics inherent to the inner and outer environment of this farming enterprise. It was observed that the grape-growing farms predominate in an average area of 1 hectare, with productivity between 20 and 25 t/ha, with offer in the harvest and in the off-season. The inner points are stronger than the weak ones, and can be adjusted with the joint execution of the viticulturists allied to the opportunities, such as agrotourism and the diversification of available cultivars that allow a greater offer of the product and minimize the inherent threats observed, such as climatic variations and the shortage of skilled labor. These identified points may indicate competitiveness strategies for the wine market in the studied regions.

scholarly journals Geochronology and heavy metal flux to Guanabara bay, Rio de Janeiro state: a preliminary study

2013 ◽  
Vol 85 (4) ◽  
pp. 1317-1327 ◽  
Author(s):  
Jose A. Baptista Neto ◽  
Tomas C.S. Peixoto ◽  
Bernard J. Smith ◽  
John J. Mcalister ◽  
Soraya M. Patchineelam ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Organic Carbon ◽  
Rio De Janeiro ◽  
Industrial Effluents ◽  
Detailed Examination ◽  
210Pb Dating ◽  
Guanabara Bay ◽  
Negative Effect ◽  
Northern Portion ◽  
Janeiro State

Guanabara Bay, located in Rio de Janeiro state. It is surrounded by the second most important metropolitan area of the country. Over recent decades, land disturbance and urbanization in the surrounding area has significantly increased sediment input to the bay and had a negative effect on its overall environmental. This is especially related to high volumes of untreated sewage and industrial effluents. This study evaluates the history of this human impact through detailed examination of a sediment core taken from the northern portion of Guanabara Bay. A geochronology is established using 210Pb dating and related to organic carbon and heavy metal fluxes to the sediments. This gave a calculated net average sedimentation rate for the core of 0.67 cm.year-1. The organic carbon and heavy metals flux started to increase at the beginning of the last century and the highest values was observed in the top of the cores.

scholarly journals Anurofauna of an Atlantic Rainforest fragment and its surroundings in Northern Rio de Janeiro State, Brazil

2010 ◽  
Vol 70 (3 suppl) ◽  
pp. 871-877 ◽  
Author(s):  
M Almeida-Gomes ◽  
M Almeida-Santos ◽  
P Goyannes-Araújo ◽  
VNT Borges-Júnior ◽  
D Vrcibradic ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Abundant Species ◽  
The State ◽  
Forest Fragments ◽  
Forest Fragment ◽  
The North ◽  
Surrounding Matrix ◽  
Plot Sampling ◽  
Northern Portion ◽  
Janeiro State

We carried out a study on the anurofaunal community from an Atlantic Forest fragment (Monte Verde mountains) and the surrounding area in Cambuci municipality, Rio de Janeiro State, Brazil, which constitutes one of the largest fragments remaining in the largely deforested landscape of the northern portion of the State. We combined three sampling methods: plot sampling, transects and pit-fall traps. We recorded twenty species of amphibians, of which only eleven were found within the forest fragment (and five of these also occurred in the surrounding matrix). Two of the species recorded in the present study (Crossodactylus sp. and Ischnocnema cf. parva) may represent undescribed taxa. Our records expand the distribution range of one species (Scinax trapicheiroi) to the north, and fill a geographic distribution gap for another one (Ischnocnema oea). The estimated overall density of frogs living in the leaf litter of the fragment (based on results of plot sampling) was 3.1 individuals/100 m², with Haddadus binotatus being the most abundant species (2.4 individuals/100 m²). Comparisons of our data with those of other studies suggest that anuran communities in forest fragments ca. 1,000 ha or smaller may be severely limited in their richness, and often include a large proportion of species tolerant to open areas, such as many hylids. Our results show the importance of increasing knowledge about the anurofaunal community of the northern portion of the State of Rio de Janeiro and preserve the forest remnants that still exist in the region.

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