Carbon and nitrogen stocks and organic matter fractions in the topsoil of traditional and agrisilvicultural systems in the Southeast of Brazil

Soil Research ◽  
2021 ◽  
Author(s):  
Leidivan Almeida Frazão ◽  
Paulo Henrique Silveira Cardoso ◽  
Maria Nilfa Almeida Neta ◽  
Mauro Franco Castro Mota ◽  
Luana Larissa de Souza Almeida ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon And Nitrogen ◽  
Organic Matter Fractions ◽  
Carbon And Nitrogen Stocks

scholarly journals Using Advanced Spectroscopy and Organic Matter Characterization to Evaluate the Impact of Oxidation on Cyanobacteria

Toxins ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 278 ◽  
Author(s):  
Saber Moradinejad ◽  
Caitlin M. Glover ◽  
Jacinthe Mailly ◽  
Tahere Zadfathollah Seighalani ◽  
Sigrid Peldszus ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Potassium Permanganate ◽  
Drinking Water Treatment ◽  
Carbon And Nitrogen ◽  
Toxic Cyanobacteria ◽  
Nitrogen Detection ◽  
Algal Organic Matter ◽  
Organic Matter Fractions ◽  
The Impact

Drinking water treatment plants throughout the world are increasingly facing the presence of toxic cyanobacteria in their source waters. During treatment, the oxidation of cyanobacteria changes cell morphology and can potentially lyse cells, releasing intracellular metabolites. In this study, a combination of techniques was applied to better understand the effect of oxidation with chlorine, ozone, potassium permanganate, and hydrogen peroxide on two cell cultures (Microcystis, Dolichospermum) in Lake Champlain water. The discrepancy observed between flow cytometry cell viability and cell count numbers was more pronounced for hydrogen peroxide and potassium permanganate than ozone and chlorine. Liquid chromatography with organic carbon and nitrogen detection was applied to monitor the changes in dissolved organic matter fractions following oxidation. Increases in the biopolymer fraction after oxidation with chlorine and ozone were attributed to the release of intracellular algal organic matter and/or fragmentation of the cell membrane. A novel technique, Enhanced Darkfield Microscopy with Hyperspectral Imaging, was applied to chlorinated and ozonated samples. Significant changes in the peak maxima and number of peaks were observed for the cell walls post-oxidation, but this effect was muted for the cell-bound material, which remained relatively unaltered.

Soil carbon and nitrogen stocks and the quality of soil organic matter under silvopastoral systems in the Brazilian Cerrado

2021 ◽  
Vol 205 ◽  
pp. 104785
Author(s):  
Luana Larrisa de Souza Almeida ◽  
Leidivan Almeida Frazão ◽  
Taynan Aquilles Marinho Lessa ◽  
Luiz Arnaldo Fernandes ◽  
Álvaro Luiz de Carvalho Veloso ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Carbon ◽  
Silvopastoral Systems ◽  
Brazilian Cerrado ◽  
Carbon And Nitrogen ◽  
Soil Carbon And Nitrogen ◽  
Carbon And Nitrogen Stocks

Carbon and nitrogen properties of particulate organic matter fractions in an Alfisol in the mid-Southern, USA

2020 ◽  
Vol 20 ◽  
pp. e00248
Author(s):  
Johan Desrochers ◽  
Kristofor R. Brye ◽  
Edward Gbur ◽  
Erik D. Pollock ◽  
Mary C. Savin
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Carbon And Nitrogen ◽  
Organic Matter Fractions
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