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RISS 인기검색어
- 검색키워드
- 저자 : Baeza-Rodriguez, Juan Jose (검색결과 2 건)
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Control of selectivity in the reduction of nitrate by shielding of Pd–Cu/C catalysts with AOT
A.M. Pérez-Coronado,L. Calvo,J.A. Baeza,J.J. Rodriguez,M.A. Gilarranz 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Catalytic chemical reduction of nitrate without generating harmful nitrite and ammonium is still achallenge limiting the application of this technology to the production of drinking water. In this work anew approach was proposed based on shielding of Pd active sites in PdCu catalysts by sodium bis-2-ethylhexyl sulphosuccinate (AOT). To study this concept and the interactions between PdCu and AOT,carbon-supported PdCu catalysts were prepared by microemulsion using AOT as surfactant, and byincipient wetness impregnation followed by exposure to AOT. All the catalysts based on AOT showedlower activity in nitrate reduction than those prepared by ordinary incipient wetness impregnation,however ammonium generation was prevented thanks to shielding of Pd active sites by AOT. Bimetalliccatalysts prepared by physically mixing Pd and Cu monometallic catalysts and exposure to AOT revealed alower activity in nitrate reduction, which was ascribed to the interference of AOT in the Pd–Cu redoxmechanism and lower hydrogen spillover. However, the catalysts maintained the ability to reduce nitritewith negligible production of ammonium, showing that shielding of Pd active sites can be an interestingapproach to avoid nitrite and ammonium formation in nitrate reduction, but a compromise betweenactivity and selectivity must be achieved.
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Genetic diversity evolution in the Mexican Charolais cattle population
Rios-Utrera, Angel,Montano-Bermudez, Moises,Vega-Murillo, Vicente Eliezer,Martinez-Velazquez, Guillermo,Baeza-Rodriguez, Juan Jose,Roman-Ponce, Sergio Ivan Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.7
Objective: The aim was to characterize the genetic diversity evolution of the registered Mexican Charolais cattle population by pedigree analysis. Methods: Data consisted of 331,390 pedigree records of animals born from 1934 to 2018. Average complete generation equivalent, generation interval, effective population size (N<sub>e</sub>), and effective numbers of founders (f<sub>e</sub>), ancestors (f<sub>a</sub>), and founder genomes (N<sub>g</sub>) were calculated for seven five-year periods. The inbreeding coefficient was calculated per year of birth, from 1984 to 2018, whereas the gene contribution of the most influential ancestors was calculated for the latter period. Results: Average complete generation equivalent consistently increased across periods, from 4.76, for the first period (1984 through 1988), to 7.86, for the last period (2014 through 2018). The inbreeding coefficient showed a relative steadiness across the last seventeen years, oscillating from 0.0110 to 0.0145. During the last period, the average generation interval for the father-offspring pathways was nearly 1 yr. longer than that of the mother-offspring pathways. The effective population size increased steadily since 1984 (105.0) and until 2013 (237.1), but showed a minor decline from 2013 to 2018 (233.2). The population displayed an increase in the f<sub>a</sub> since 1984 and until 2008; however, showed a small decrease during the last decade. The effective number of founder genomes increased from 1984 to 2003, but revealed loss of genetic variability during the last fifteen years (from 136.4 to 127.7). The f<sub>a</sub>:f<sub>e</sub> ratio suggests that the genetic diversity loss was partially caused by formation of genetic bottlenecks in the pedigree; in addition, the N<sub>g</sub>:f<sub>a</sub> ratio indicates loss of founder alleles due to genetic drift. The most influential ancestor explained 1.8% of the total genetic variability in the progeny born from 2014 to 2018. Conclusion: Inbreeding, N<sub>e</sub>, f<sub>a</sub>, and N<sub>g</sub> are rather beyond critical levels; therefore, the current genetic status of the population is not at risk.
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