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Green carbon dots synthesized from Chlorella Sorokiniana microalgae biochar for chrome detection
Aline C.C. Pena,Lucas Manique Raymundo,Luciane F. Trierweiler,Mariliz Gutterres 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
In the quest to find an economical and accurate method of detecting toxic metals as well as finding anapplication for biochar as a fuel, this work used microalgae biochar to sinter Carbon Dots (CDs) thatcan be used as pathways for metallic ions detection. Carbon Dots from microalgae biochar (generatedin pyrolysis) were synthesized through thermochemical depolymerization with KMnO4 at different concentrations. After this step, the purification of the nanoparticles was performed. The characterization ofCDs was performed through fluorescence intensity, Zeta Potential, Fourier Transform InfraredSpectroscopy (FTIR), and atomic force microscopy (AFM). The results showed that all samples exhibitedfluorescence, samples synthesized with KMnO4 at concentrations of 8.54 % and 10.0 % (CD-MBK06 andCD-MBK07, respectively) showed the highest fluorescence intensity and good stability. When addingCr (VI) and Cr (III) to the CD-MBK06 and CD-MBK07 samples, it is possible to notice that there was fluorescencequenching as the metal ion concentration increased, except for the CD-MBK07 sample for Cr(III), at a length of 350 nm, indicating that this sample shows selectivity for extinction only for Cr (VI).
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Salinas-Chavira, J.,Arzola, C.,Gonzalez-Vizcarra, V.,Manriquez-Nunez, O.M.,Montano-Gomez, M.F.,Navarrete-Reyes, J.D.,Raymundo, C.,Zinn, R.A. Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.9
In experiment 1, eighty crossbred steers ($239{\pm}15kg$) were used in a 229-d experiment to evaluate the effects of increasing levels of enzymatically hydrolyzed yeast (EHY) cell wall in diets on growth performance feedlot cattle during periods of elevated ambient temperature. Treatments consisted of steam-flaked corn-based diets supplemented to provide 0, 1, 2, or 3 g EHY/hd/d. There were no effects on growth performance during the initial 139-d period. However, from d 139 to harvest, when 24-h temperature humidity index averaged 80, EHY increased dry matter intake (DMI) (linear effect, p<0.01) and average daily gain (ADG) (linear effect, p = 0.01). There were no treatment effects (p>0.10) on carcass characteristics. In experiment 2, four Holstein steers ($292{\pm}5kg$) with cannulas in the rumen and proximal duodenum were used in a $4{\times}4$ Latin Square design experiment to evaluate treatments effects on characteristics of ruminal and total tract digestion in steers. There were no treatment effects (p>0.10) on ruminal pH, total volatile fatty acid, molar proportions of acetate, butyrate, or estimated methane production. Supplemental EHY decreased ruminal molar proportion of acetate (p = 0.08), increased molar proportion of propionate (p = 0.09), and decreased acetate:propionate molar ratio (p = 0.07) and estimated ruminal methane production (p = 0.09). It is concluded that supplemental EHY may enhance DMI and ADG of feedlot steers during periods of high ambient temperature. Supplemental EHY may also enhance ruminal fiber digestion and decrease ruminal acetate:propionate molar ratios in feedlot steers fed steam-flaked corn-based finishing diets.
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J. Salinas-Chavira,C. Arzola,V. Gonzalez-Vizcarra,O.M. Manriquez-Nunez,M.F. Montano-Gomez,J.D. Navarrete-Reyes,C. Raymundo,R.A. Zinn 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.9
In experiment 1, eighty crossbred steers (239±15 kg) were used in a 229-d experiment to evaluate the effects of increasing levels of enzymatically hydrolyzed yeast (EHY) cell wall in diets on growth performance feedlot cattle during periods of elevated ambient temperature. Treatments consisted of steam-flaked corn-based diets supplemented to provide 0, 1, 2, or 3 g EHY/hd/d. There were no effects on growth performance during the initial 139-d period. However, from d 139 to harvest, when 24-h temperature humidity index averaged 80, EHY increased dry matter intake (DMI) (linear effect, p<0.01) and average daily gain (ADG) (linear effect, p = 0.01). There were no treatment effects (p>0.10) on carcass characteristics. In experiment 2, four Holstein steers (292±5 kg) with cannulas in the rumen and proximal duodenum were used in a 4×4 Latin Square design experiment to evaluate treatments effects on characteristics of ruminal and total tract digestion in steers. There were no treatment effects (p>0.10) on ruminal pH, total volatile fatty acid, molar proportions of acetate, butyrate, or estimated methane production. Supplemental EHY decreased ruminal molar proportion of acetate (p = 0.08), increased molar proportion of propionate (p = 0.09), and decreased acetate:propionate molar ratio (p = 0.07) and estimated ruminal methane production (p = 0.09). It is concluded that supplemental EHY may enhance DMI and ADG of feedlot steers during periods of high ambient temperature. Supplemental EHY may also enhance ruminal fiber digestion and decrease ruminal acetate:propionate molar ratios in feedlot steers fed steam-flaked corn-based finishing diets.
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