Consulta: subjectFacets:"FTIR spectroscopy"
Registros recuperados: 3
Data/hora: 12/06/2024 05:50:28

Pinus afforestation in South Brazilian highlands: soil chemical attributes and organic matter composition
Provedor de dados: 63
Autores: Dick,Deborah Pinheiro; Leite,Simone Benvenuti; Dalmolin,Ricardo Simão Diniz; Almeida,Henrique Cesar; Knicker,Heike.
In the last three decades, exotic tree species are being introduced in the natural pastures of the highlands located at the northeastern part of Rio Grande do Sul State (RS), Brazil. This alteration of land use may impart drastic changes in the soil attributes. In this context, this work aimed to evaluate the impact of Pinus taeda afforestation on soil chemical attributes and organic matter (SOM) composition in Leptosols from Campos de Cima da Serra, RS. Soil samples under eight year old (Pi8) and 30 year old (Pi30) Pinus plantations and under native pasture (NP) were studied. Contents of exchangeable cations and of micronutrients and soil pH were determined. The SOM composition was investigated by means of elemental analyses and FTIR spectroscopy. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FTIR spectroscopy; Humification; Exchangeable cation; Pastures; Recalcitrance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200007

FTIR transmission spectroscopy for measurement of algae neutral lipids
Provedor de dados: 111
Autores: AlShikaili, Talal Yasir; Thomasson, John Alex; Ge, Yufeng; Brown, Louis; Brown, Jola.
Algae lipids can be used to produce biofuels and are considered a potential source of energy to supplant fossil fuel. Cultivation practices of algae grown in large ponds can be tailored to maximize lipid content. Laboratory methods of measuring lipid content are time-consuming and labor-intensive, so a real-time measuring technique is needed to efficiently control the addition of pond nutrients.  The objective of this research was to determine the effectiveness of measuring algae lipid content with Fourier Transform Infrared (FTIR) transmission spectroscopy. Six algae samples (Nannochloropsis salina) with varying lipid contents were centrifuged and then dried in an oven at 40° C for 12 hours. Dried algae were mixed with potassium bromide (KBr) powder at a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofuels; FTIR spectroscopy; ATR spectroscopy; KBr pellets; Mid-infrared spectroscopy.
Ano: 2022
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5405

Impact of environmental stress on biochemical parameters of bacteria reducing chromium
Provedor de dados: 58
Autores: Batool,Rida; Yrjälä,Kim; Hasnain,Shahida.
Chromium pollution is produced in connection with industrial processes like in tanneries. It has been suggested that bioremediation could be a good option for clean up. The stress effect of variable chromate levels, pHs and growth temperatures on biochemical parameters of two Cr(VI) reducing bacterial strains Pseudomonas aeruginosa Rb-1 and Ochrobactrum intermedium Rb-2 was investigated. Transmission electrone microscopy (TEM) was performed to study the intracellular distribution of Cr(VI). It was observed that initial stress of 1000 µgmL-1 caused significant enhancement of all studied biochemical parameters at pH 7.0 and growth temperature of 37 °C showing great bioremediation potential of the strains. Transmission electron microscopy revealed that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cr(VI); PH; Temperature; Biochemical parameters; TEM; FTIR spectroscopy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000200028