Mechanisms Involved in Soil Ammonium Production in a Mauritia flexuosa Palm Swamp Community

Wetlands ◽  
2017 ◽  
Vol 38 (3) ◽  
pp. 641-646 ◽  
Author(s):  
Noemí Chacón ◽  
Rafael Herrera ◽  
Carlos Méndez ◽  
Alessia Bastianoni ◽  
Enrique Quintero-Torres
2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Munique Gonçalves Guimarães ◽  
Rafael Benjamin Werneburg Evaristo ◽  
Augusto César de Mendonça Brasil ◽  
Grace Ferreira Ghesti

AbstractThe present work analyzed the energy generation potential of Buriti (Mauritia flexuosa L. f.) by thermochemical reactions. The experimental part of the study performed immediate analyses, elemental analyses, lignocellulosic analysis, thermogravimetric analysis, calorific values, and syn gas concentrations measurements of the gasification of Buriti in a fixed-bed reactor. Additionally, numerical simulations estimated the syn gas concentrations of the gasification reactions of Buriti. The immediate analysis showed that Buriti has the highest ash content (4.66%) and highest volatile matter content (85%) compared to other Brazilian biomass analyzed, but the higher heating value was only 18.28 MJ.kg−1. The elemental analysis revealed that the oxygen to carbon ratio was 0.51 while hydrogen to carbon ratio was 1.74, indicating a good thermal conversion efficiency. The Lignocellulosic analysis of Buriti resulted in a high content of holocellulose (69.64%), a lignin content of 28.21% and extractives content of 7.52%. The thermogravimetry of the Buriti indicated that the highest mass loss (51.92%) occurred in a temperature range between 150 °C and 370 °C. Lastly, the experimental gasification study in a fixed-bed updraft gasifier resulted in syn gas concentrations of 14.4% of CO, 11.5% of CO2 and 17.5% of H2 while the numerical simulation results confirmed an optimal equivalence ratio of 1.7 to maximize CO and H2 concentrations. Therefore, based on the results presented by the present work, the gasification process is adequate to transform Buriti wastes into energy resources. Graphic abstract


Author(s):  
Carlena S. M. da Silva ◽  
Junior A. de Araújo ◽  
Tiago S. Silveira ◽  
Kelly C. F. Castro ◽  
Leopoldo C. Baratto ◽  
...  

2017 ◽  
Vol 10 ◽  
pp. 70-92 ◽  
Author(s):  
Arika Virapongse ◽  
Bryan A. Endress ◽  
Michael P. Gilmore ◽  
Christa Horn ◽  
Chelsie Romulo

Author(s):  
Giovana Anceski Bataglion ◽  
Weider Henrique Pinheiro Paz ◽  
Asenate Aline Xavier Adrião ◽  
Julia Melissa da Rocha Albuquerque ◽  
Felipe Moura Araújo da Silva ◽  
...  

2002 ◽  
Vol 283 (4) ◽  
pp. E729-E737 ◽  
Author(s):  
Greg Coates ◽  
Itzhak Nissim ◽  
Harold Battarbee ◽  
Tomas Welbourne

We studied the effect of the antihyperglycemic glitazones, ciglitazone, troglitazone, and rosiglitazone, on glutamine metabolism in renal tubule-derived Madin-Darby canine kidney (MDCK) cells. Troglitazone (25 μM) enhanced glucose uptake and lactate production by 108 and 92% (both P < 0.001). Glutamine utilization was not inhibited, but alanine formation decreased and ammonium formation increased (both P < 0.005). The decrease in net alanine formation occurred with a change in alanine aminotransferase (ALT) reactants, from close to equilibrium to away from equilibrium, consistent with inhibition of ALT activity. A shift of glutamine's amino nitrogen from alanine into ammonium was confirmed by usingl-[2-15N]glutamine and measuring the [15N]alanine and [15N]ammonium production. The glitazone-induced shift from alanine to ammonium in glutamate metabolism was dose dependent, with troglitazone being twofold more potent than rosiglitazone and ciglitazone. All three glitazones induced a spontaneous cellular acidosis, reflecting impaired acid extrusion in responding to both an exogenous (NH[Formula: see text]) and an endogenous (lactic acid) load. Our findings are consistent with glitazones inducing a spontaneous cellular acidosis associated with a shift in glutamine amino nitrogen metabolism from predominantly anabolic into a catabolic pathway.


2006 ◽  
Vol 12 (1-2) ◽  
pp. 15 ◽  
Author(s):  
Roberto ROJAS-RUIZ ◽  
Gabriel RUÍZ-PANDURO ◽  
Pedro RAMÍREZ-MELÉNDEZ ◽  
Carlo F. SALAZAR-JARAMA ◽  
Cléver RENGIFO-SIAS ◽  
...  
Keyword(s):  

Este trabajo discute la comercialización de frutos de aguaje en forma de masa y«fruto verde» en la ciudad de Iquitos, Perú. Existen 11 mercados en la ciudad. En cuatro de ellos, es ofertada la masa; en dos, el «fruto verde» por 21 y 30 vendedoras, respectivamente. Ambas actividades son llevadas a cabo por mujeres mayores de 40 años, que tienen en promedio cuatro hijos y cuyas parejas, por lo general, no trabajan. Las comercializadoras de masa y «fruto verde» se dedican a esta actividad desde hace 20 años en promedio. Cabe indicar, sin embargo, que la persona más experimentada la realiza desde hace ya 50 años. Las vendedoras ofrecen sus productos durante todo el año, lo que representa un consumo mensual de 3 720 sacos, cantidad para la que se deben cortar aproximadamente 1 078 palmeras.De un saco de aguaje se obtienen en promedio 22 bolsas de masa y 16 bandejaspequeñas de «fruto verde». Esta cantidad rinde, en época de abundancia, utilidades superiores al salario mínimo de un obrero de la actividad privada. Asimismo, durante la época de escasez, el beneficio económico es mayor que el salario de un docente universitario estatal. Los frutos se exportan en cantidades mínimas a otras ciudades del Perú como Tarapoto, Pucallpa y Lima.Las vendedoras han desarrollado técnicas sencillas y rápidas para conocer la madurez fisiológica del fruto y el ecotipo ofertado.


2018 ◽  
Vol 12 (2) ◽  
pp. 1284-1294 ◽  
Author(s):  
Caroline Honaiser Lescano ◽  
Ivan Pires de Oliveira ◽  
Fernando Freitas de Lima ◽  
Débora da Silva Baldivia ◽  
Priscilla Narciso Justi ◽  
...  

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