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排序方式: 共有109条查询结果,搜索用时 15 毫秒
91.
Juan Carlos Vences-Benitez Verónica Martínez-Miranda Ivonne Linares-Hernández Perla Tatiana Almazán-Sánchez Guadalupe Vázquez-Mejía 《Water, air, and soil pollution》2017,228(10):393
The goal of this research was the electrooxidation (EO) of a nonionic surfactant nonylphenol decaethoxylate (NP-10) in aqueous solution and denim wastewater. Three different configuration systems were evaluated in batch cells using a boron-doped diamond (BDD) anode; copper, iron, and BDD were used as cathodes. The EO process was carried out in a batch process, in a glass cell with a capacity of 1000 mL. The anode surface area was 0.0307 m2 and 1–3 A of current intensity were applied (3, 6, 10 mA/cm2) with an electrolysis time of 240 min for aqueous solution and 780 min for denim wastewater in order to investigate the degradation of the surfactant. The processes were analyzed in terms of chemical oxygen demand (COD) and total organic carbon (TOC). The maximum mineralization efficiency in aqueous solution for the BDD-Cu electrooxidation system was 92.2% for COD and 45.6% for TOC at pH 2 and 3 mA/cm2 of current intensity. For denim wastewater, the removal efficiency was 44.1% for COD and 26.5% for TOC at pH 4.5 and 6 mA/cm2 of current intensity, using a BDD-BDD system. The raw and treated (aqueous solution and denim) wastewater were characterized by UV-Vis and infrared spectroscopy. 相似文献
92.
Palemón-Alberto Francisco Cruz-Lagunas Blas Ortega-Acosta Santo Ángel Reyes-García Guadalupe Damián-Nava Agustín Toribio-Jiménez Jeiry Romero-Ramírez Yanet Vargas-Álvarez Dolores Bello-Martínez Jorge 《植物病害和植物保护杂志》2020,127(2):275-277
Journal of Plant Diseases and Protection - The soursop (Annona muricata) is an important tropical plant in the Pacific and Gulf region of México. In a farmer plantation during May, severe soft... 相似文献
93.
Ricardo Musule Enrique Alarcón-Gutiérrez Eric P. Houbron Guadalupe M. Bárcenas-Pazos M. del Rosario Pineda-López Zaira Domínguez Lázaro R. Sánchez-Velásquez 《Journal of Wood Science》2016,62(6):537-547
Tree adaptation to environment has been extensively studied. However, little is known about the variations in structure and chemical composition of lignocellulosic biomass (LB) in relation to altitudinal gradient. We wonder, are there significant variations in the LB in the wood across an altitudinal gradient? To answer this, we carried out a study of Abies religiosa. Wood samples were collected from 36 trees, grown between 3000 and 3500 masl, and then subjected to gravimetric and FTIR (Fourier Transform Infrared) spectroscopic analyses. The gravimetric results showed a proportion of 54.81 ± 2.20 % cellulose, 12.37 ± 1.33 % hemicellulose and 24.68 ± 1.16 % of insoluble lignin. Using the principal components analysis with analysis of variance (ANOVA), significant differences were found at 3100 and 3200 masl in two independent components related to both hemicellulose and lignin, through gravimetry as well as the spectroscopic bands assigned to the carbonyl groups of these polymers, respectively. However, the observed changes in chemical composition of LB did not follow a linear relationship with respect to the altitudinal gradient, which suggests that complex environmental interactions could also be playing an important role. Also, there were significant differences (p < 0.05) in two of the empirical indexes calculated from the FTIR analysis. 相似文献
94.
95.
Polysaccharide profile and content during the vinification and aging of Tempranillo red wines 总被引:2,自引:0,他引:2
Passing from must to wine produced a loss of low-molecular-weight grape structural glucosyl polysaccharides, and an important gain in yeast mannoproteins (MP) and grape-derived arabinogalactan proteins (AGP), and rhamnogalacturonans-II (RG-II). AGP were more easily extracted than RG-II, and small quantities of RG-II monomers and galacturonans were detected. Postmaceration produced a reduction in all grape polysaccharide families, particularly acute in AGP. The reduction of polysaccharides during malolactic fermentation only affected grape AGP, and MP were continuously liberated during the entire vinification process. Wine oak and bottle aging was associated with a relative stability of the polysaccharide families. AGP were thus the majority polysaccharides in young wines but, contrary to what may be thought, structural glucosyl oligosaccharides dominated in musts and MP in aged wines. Precipitation of polysaccharides was noticeable during vinification, and it mainly affected high-molecular-weight AGP and MP. Hydrolytic phenomena affected the balance of wine polysaccharides during late maceration-fermentation. 相似文献
96.
Graciela Inés Bolzon de Muñiz Mayara Elita Carneiro Silvana Nisgoski María Guadalupe Lomeli Ramirez Washington Luis Esteves Magalhães 《Wood Science and Technology》2013,47(4):815-823
This paper characterizes wood and charcoal made from Hymenaea aurea, Mimosa scabrella, Tabebuia capitata and Eucalyptus alba by scanning electron microscopy and near infrared for the purpose of developing a technique to identify the source of charcoal samples. Ten test samples were prepared for each species, oriented in transverse, radial and tangential section. Samples were carbonized in a muffle furnace with a final temperature of 450 °C and a heating rate of 1.66 °C/min. The microscopic structures of the wood and charcoal samples were verified by scanning electron microscopy, and spectra were obtained with a spectrophotometer, equipped with an integrating sphere and operating in transmittance mode. The spectra of the wood samples present characteristic bands of lignocellulosic material, while the spectra of the charcoal samples show small or nil absorption in the near-infrared region. The near-infrared spectroscopy technique was efficient in discriminating the four species studied. 相似文献
97.
Fidel Payan-Zelaya Jean Michel Harmand Antonio Flores-Macías John Beer Guadalupe Ramos-Espinoza Fernando de León González 《Agroforestry Systems》2013,87(2):439-450
To investigate the effects of microbial inocula and Erythrina poeppigiana pruning residues on soil K, NO3?, and NH4+ concentrations, a greenhouse trial, a field experiment in an organic farm, and three in vitro tests were conducted. Under controlled conditions, weak, temporary effects (10 %) on maize seedling growth were observed on poor soils (taken from the 10–20 cm layer) in the first 2 weeks after application. Positive effects of pruning residue applications on soil K levels (0.09 cmol kg?1, on average) were detected in both the field and greenhouse study. However, significant effects due to the addition of microbial inocula on soil K concentrations were not detected in the field; thus, microbial applications were ineffective at enhancing nutrient availability under field conditions. In contrast, in the in vitro experiments, CO2 production was 31 % greater than that of untreated soil on the 8th and 15th days of incubation. These results highlight the importance of adding tree pruning residues to support coffee-plant nutrition. Experimental outcome data could be valuable for further studies focused on microbial application dosage and timing. 相似文献
98.
Faviola Reyes-Pérez María Guadalupe Salazar-García Ana Lourdes Romero-Baranzini Alma Rosa Islas-Rubio Benjamín Ramírez-Wong 《Plant foods for human nutrition (Dordrecht, Netherlands)》2013,68(1):52-56
The increasing demand for high-fiber products has favored the design of numerous bakery products rich in fiber such as bread, cookies, and cakes. The objective of this study was to evaluate the dietary fiber and estimated glycemic index of cookies containing extruded wheat bran. Wheat bran was subjected to extrusion process under three temperature profiles: TP1;(60, 75, 85 and 100 °C), TP2;(60, 80, 100 and 120 °C), and TP3;(60, 80, 110 and 140 °C) and three moisture contents: (15, 23, and 31 %). Cookies were elaborated using extruded wheat bran (30 %), separated into two fractions (coarse and fine). The dietary fiber content of cookies elaborated with extruded wheat bran was higher than the controls; C0 (100 % wheat flour) and C1 (30 % of no extruded bran coarse fraction) and C2 (30 % of no extruded bran fine fraction). The higher values of dietary fiber were observed on cookies from treatments 5 (TP1, 31 % moisture content and coarse fraction) and 11 (TP2, 31 % moisture content and coarse fraction). The estimated glycemic index of cookies ranged from 68.54 to 80.16. The dietary fiber content of cookies was increased and the lowest glycemic index corresponded to the cookies elaborated with extruded wheat bran. Cookie made with the treatment 11 had a better dietary fiber content and lower estimated glycemic index. 相似文献
99.
Marcelo Hernández-Salazar Ramón G. Guevara-González Andrés Cruz-Hernández Lorenzo Guevara-Olvera Luis Arturo Bello-Pérez Eduardo Castaño-Tostado Guadalupe Loarca-Piña 《Plant foods for human nutrition (Dordrecht, Netherlands)》2013,68(3):259-267
The influence of flaxseed (Linum usitatissimum L.) and its total non-digestible fraction (TNDF) on the expression of genes involved in azoxymethane (AOM)-induced colon cancer in Sprague Dawley rats was analyzed. The dose used in the animal model was two tablespoons of flaxseed per day, which is the dose recommended for humans. Flaxseed significantly decreased the crypt multiplicity (10.50?±?3.5) compared with the AOM treatment (34.00?±?11.0), which suggests that flaxseed exhibits a preventive effect against colon cancer. Both treatments (flaxseed and TNDF) influence the overexpression of genes involved in cell cycle arrest and mitochondrial apoptosis: p53, p21, bcl-2, bax and caspase-3. Flaxseed induced the expression of p53 and p21, whereas TNDF triggered the p21-independent expression of p53. This finding suggests that both of these treatments induced cell cycle arrest. In addition, TNDF induced mitochondrial apoptosis because the TNDF + AOM group exhibited the expression of caspase-3, decreased bcl-2 expression and increased bax expression. These results suggest that the expression of the analyzed genes is associated with the presence of dietary antioxidants linked to the cell wall of flaxseed. 相似文献
100.
Toledo-Solís Francisco Javier Hilerio-Ruiz Andrea Guadalupe Delgadin Tomás Sirkin Daniela Pérez Di Yorio María Paula Vissio Paula Gabriela Peña-Marín Emyr Saul Martínez-García Rafael Maytorena-Verdugo Claudia Ivette Álvarez-González Carlos Alfonso de Rodrigáñez Miguel Angel Sáenz 《Fish physiology and biochemistry》2021,47(4):1211-1227
Fish Physiology and Biochemistry - Cichlasoma dimerus is a neotropical cichlid that has been used as a biological model for neuroendocrinology studies. However, its culture is problematic in terms... 相似文献