Results 21 to 30 of about 115,504 (117)

Estoques de carbono e nitrogênio e frações orgânicas de Latossolo submetido a diferentes sistemas de uso e manejo Carbon and nitrogen storage and organic fractions in Latosol submitted to different use and management systems

Revista Brasileira de Ciência do Solo, 2007
O avanço das fronteiras agrícolas, caracterizado pela substituição de ecossistemas naturais por áreas cultivadas, vem se intensificando nas últimas décadas, acarretando alterações na qualidade do solo e na dinâmica da matéria orgânica do solo (MOS ...
Otacílio José Passos Rangel, Carlos Alberto Silva   +1 more
doaj   +1 more source

Efeito da solução de separação densimétrica na quantidade e qualidade da matéria orgânica leve e na quantificação do carbono orgânico da fração pesada The effect of density fractionation solutions on the amount and quality of light-fraction organic matter and the content of heavy-fraction organic carbon

Revista Brasileira de Ciência do Solo, 2008
A matéria orgânica leve tem se mostrado um indicador precoce das mudanças na matéria orgânica do solo (MOS) acarretadas por diferentes usos e sistemas de manejo.
Michelle Sales Moreira Demolinari, Ivo Ribeiro Silva, Augusto Miguel Nascimento Lima, Leonardus Vergutz, Eduardo de Sá Mendonça   +4 more
doaj   +1 more source

Eficiência do politungstato de sódio no fracionamento densimétrico da matéria orgânica do solo Efficiency of sodium polytungstate in density fractionation of soil organic matter

Revista Brasileira de Ciência do Solo, 2007
Soluções de iodeto de sódio (NaI) e de politungstato de sódio (PTS) têm sido utilizadas, de forma indistinta, no fracionamento densimétrico da matéria orgânica (MO) do solo. O objetivo deste estudo foi avaliar o efeito desses dois produtos em soluções de
Paulo Cesar Conceição, Madalena Boeni, Jeferson Dieckow, Cimélio Bayer, Ladislau Martin-Neto, João Mielniczuk   +5 more
doaj   +1 more source

Frações da matéria orgânica de Latossolo sob influência de doses de lodo de esgoto Organic matter fractions of an Oxisol under influence of sewage sludge doses

Pesquisa Agropecuária Brasileira, 2008
O objetivo deste trabalho foi avaliar o efeito da aplicação contínua de doses crescentes de lodo de esgoto sobre os teores de carbono (C) associados à fração leve (C-FL) e à fração pesada (associado à areia - C-areia; associado ao silte - C-silte - e ...
Emanuelle Mercês Barros Soares, Carlos Alberto Silva, Bruno de Oliveira Dias, Wagner Bettiol, Maísa Honório Belizário   +4 more
doaj   +1 more source

Base specific fractionation of double stranded DNA: affinity chromatography on a novel type of adsorbant [PDF]

, 1978
Bünemann H, Müller W. Base specific fractionation of double stranded DNA: affinity chromatography on a novel type of adsorbant. Nucleic Acids Research.
Werner Mliller, Müller, Werner, Bünemann, Hans, Biologie Ii, Hans Bunemann   +4 more
core   +1 more source

Fractionation [PDF]

, 2019
Fractionation, in the most general sense, could mean any process whereby a mixture is separated into different components or fractions. Examples of fractionation processes include dephlegmation, fractional distillation, fractional freezing, fractional ...

core   +1 more source

New Combination of EXAFS Spectroscopy and Density Fractionation for the Speciation of Chromium within an Andosol

, 2016
Studying speciation of heavy metals instead of their total concentration in a complex matrix such as soil is a scientific challenge that requires a combination of different analytical techniques. We compared the speciation of Cr within an andosol (island
Daniel Borschneck (446069), Jean-Louis Hazemann (1663294), Hervé Saint Macary (2515663), Jérôme Rose (2515666), Armand Masion (1785610), Jean-Yves Bottero (446073)   +5 more
core   +1 more source

Erosion of granular sediments by submerged impinging jets: Particle size effects and cohesion onset

AIChE Journal, Volume 72, Issue 6, June 2026.
Abstract This study investigates the erosion behavior and modeling of glass particle beds under impinging jet conditions, with a focus on particle size effects and the onset of cohesion. Ultrasonic profiling is implemented to scan and measure static crater profiles.
Ahmad Mohamadiyeh, Jeffrey Peakall, Michael Fairweather, Martyn Barnes, Timothy N. Hunter   +4 more
wiley   +1 more source

Microbial Community Shifts and Plant Performance Improvements Driven by Bacillus firmus in Pampa Agroecosystems

Environmental Microbiology Reports, Volume 18, Issue 3, June 2026.
The study shows that Bacillus firmus‐based bionematicides modulate soil microbiota and enhance soybean growth in the Pampa biome. Effects vary by location and time, with increased beneficial bacteria, reduced fungi, and decreased root nematode infestation. Overall, B.
David Fagundes, Laís Mara Santana Costa, Alexandro Cagliari, Diego Prado de Vargas, Alexandre Rieger   +4 more
wiley   +1 more source

A Numerical Study of the Effects of Density Contrast on Flow, Turbulence, and Mixing at the Negro/Solimoes Confluence, Brazil

Water Resources Research, Volume 62, Issue 5, May 2026.
Abstract Eddy‐resolving numerical simulations are conducted to investigate the effects of density contrast between the confluent flows on hydrodynamics, coherent structures and mixing downstream of the confluence between the Negro and Solimões Rivers, Brazil, which is characterized by both a large discharge (>100,000 m3/s) and a large aspect‐ratio (W/D 
C. Jiang, M. Koken, G. Constantinescu, C. Gualtieri   +3 more
wiley   +1 more source