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Electrochemical determination of sunscreens agents in cosmetic using square wave voltammetry.

Sunscreen agents and in particular UV filters are compounds added in different cosmetic formulations, that has the function of preventing damage caused by sun exposition. Therefore, this paper proposes the development of a simple, fast and reliable electroanalytical method utilizing square wave volt...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:11 AM

Can intensification of cattle ranching reduce deforestation in the Amazon? insights from an agent-based social-ecological model.

Deforestation in the Amazon with its vast consequences for the ecosystem and climate is largely related to subsequent land use for cattle ranching. In addition to conservation policies, proposals to reduce deforestation include measures to intensify cattle ranching. However, the effects of land-use ...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:09 AM

Simulation of the holocene climate over South America and impacts on the vegetation.

We provide a comprehensive analysis of the Holocene climate and vegetation changes over South America through numerical simulations. Holocene climate for several periods (8 ka, 6 ka, 4 ka, 2 ka, and present) were simulated by an atmospheric general circulation model, forced with orbital parameters, ...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:08 AM

Changes in secondary vegetation dynamics in a context of decreasing deforestation rates in Pará Brazilian Amazon.

Tropical secondary vegetation is of particular interest as carbon sinks, potential lands for agriculture and livestock expansion, biodiversity conservation and ecosystem services. Until mid-2000s estimates of secondary vegetation in the Brazilian Amazon indicated a progressive increase of this cover...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:06 AM

Agricultural expansion in the Brazilian Cerrado: increased soil and nutrient losses and decreased agricultural productivity.

While food and nutrition security are issues that national and international organizations are tackling, one of the central problems often overlooked is the essential role of soils in providing nutritious food. Soils are the base for food production and food security. However, the majority of soils ...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:05 AM

Interceptação da chuva em ambiente de mata atlântica em clima tropical de altitude.

Resumo: A Mata Atlântica é um dos biomas brasileiros onde a partição das chuvas é mais estudada. No entanto, a maior parte das pesquisas é de curta duração, raramente ultrapassando um ano de coleta de dados. Investigações de longo prazo são importantes para avaliar a variação interanual...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 11:03 AM

Empowering communities? local stakeholders’ participation in the clean development mechanism in Latin America.

Under the United Nations Framework Convention on Climate Change, the Clean Development Mechanism (CDM) requires local stakeholders to participate by sharing their comments on CDM activities. This stipulation aims at promoting social equity, a key element of sustainable development. We draw on the st...
  • por Portal Padrão
  • publicado
  • 24/02/2019
  • 10:55 AM

Using the U-net convolutional network to map forest types and disturbance in the Atlantic rainforest with very high resolution images.

Mapping forest types and tree species at regional scales to provide information for ecologists and forest managers is a new challenge for the remote sensing community. Here, we assess the potential of a U-net convolutional network, a recent deep learning algorithm, to identify and segment (1) natura...
  • por Portal Padrão
  • publicado
  • 06/02/2019
  • 12:57 PM

Territórios e alianças políticas do pós-ambientalismo.

O objetivo deste artigo é contribuir com o debate acerca do desmatamento no contexto da evolução das políticas de gestão fundiária e territorial na Amazônia, destacando seu papel relevante para o reconhecimento de direitos políticos de categorias sociais minoritárias. A associação do desm...
  • por Portal Padrão
  • publicado
  • 25/01/2019
  • 1:50 PM

Representation of fire, land-use change and vegetation dynamics in JULES.

Disturbance of vegetation is a critical component of land cover, but is generally poorly constrained in land surface and carbon cycle models. In particular, land-use change and fire can be treated as large-scale disturbances without full representation of their underlying complexities and interactio...
  • por Portal Padrão
  • publicado
  • 24/01/2019
  • 11:02 AM

Combined exposure to hydroelectric expansion, climate change and forest loss jeopardies amphibians in the Brazilian Amazon.

Aim: Human-driven impacts constantly threat amphibians, even in largely protected regions such as the Amazon. The Brazilian Amazon is home to a great diversity of amphibians, several of them currently threatened with extinction. We investigated how climate change, deforestation and establishment of ...
  • por Portal Padrão
  • publicado
  • 18/12/2018
  • 2:16 PM

Impact of intensive fish farming on methane emission in a tropical hydropower reservoir.

Fisheries and aquaculture are important sources of food for hundreds of millions of people around the world. World fish production is projected to increase by 15% in the next 10 years, reaching around 200 million tonnes per year. The main driver of this increase will be based on fish farming managem...
  • por Portal Padrão
  • publicado
  • 18/12/2018
  • 2:15 PM