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排序方式: 共有101条查询结果,搜索用时 15 毫秒
91.
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
92.
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
93.
Uriel Ramírez-Rivera José Roberto Sanginés-García José Guadalupe Escobedo-Mex Fanny Cen-Chuc Juan Antonio Rivera-Lorca Pedro Enrique Lara-Lara 《Agroforestry Systems》2010,80(2):295-302
Feed intake and digestibility were evaluated in sheep fed low quality Taiwan grass supplemented with Tithonia diversifolia. Four wether hair sheep were housed in metabolic cages and fed with either Control concentrate 20%, Tithonia 20, 35 or 50%
in a Latin Square design. Adaptation and, feces and urine collection periods were 14 and 7 days, respectively. Feed intake
was increased (P < 0.01) from 58.5 in control to 86.1 g/kg0.75 in sheep fed Tithonia. NDF intake and digestibility were affected by Tithonia level. Nitrogen intake increased linearly (P < 0.01) with increase in feces and urine excretion. N retention was similar (P > 0.1) among sheep fed Tithonia, but different (P < 0.05) from control. Inclusion of Tithonia foliage at 20% of the DM diet of hair sheep improved their intake of low quality
Taiwan grass and nitrogen retention. Higher levels of Tithonia in the diet, however, increase nitrogen loss in feces and urine. 相似文献
94.
José A. Román-Brito Edith Agama-Acevedo Guadalupe Méndez-Montealvo Luis A. Bello-Pérez 《Cereal Chemistry》2007,84(5):502-505
Nixtamalized corn flour for tortilla preparation had added xanthan gum at different concentrations. Rollability, puncture, and extensibility tests using a texture analyzer machine measured the effect of xanthan gum on the staling of corn tortillas. Rollability, puncture, and extensibility tests were simple, fast, and repeatable. The rollability parameters showed that the addition of gum produced more flexible tortillas with decreased staling. The addition of hydrocolloid decreased the force required to penetrate the tortilla, but this parameter was slightly increased when storage time increased. The parameters determined in the extensibility test showed textural differences because the fresh tortillas had a higher distance of extensibility and this parameter decreased when storage time increased. Untreated stored tortillas presented a higher modulus of deformation, work, and rupture force values. However, the addition of xanthan gum decreased these values. The addition of hydrocolloid to tortilla decreased the hardness and increased the flexibility and rubbery characteristics of tortillas. 相似文献
95.
Juan Carlos Martínez-González Francisco Javier García-Esquivel Gaspar Manuel Parra-Bracamonte Héctor Castillo-Juárez Eugenia Guadalupe Cienfuegos-Rivas 《Tropical animal health and production》2010,42(5):887-892
The aim of this study was to estimate genetic parameters for growth traits in Mexican Nellore cattle. A univariate animal
model was used to estimate (co)variance components and genetic parameters. The traits evaluated were birth weight (BW), weaning
weight (WW), and yearling weight (YW). Models used included the fixed effects of contemporary groups (herd, sex, year, and
season of birth) and age of dam (linear and quadratic) as a covariate. They also included the animal, dam, and residual as
random effects. Phenotypic means (SD) for BW, WW, and YW were 31.4 (1.6), 175 (32), and 333 (70) kg, respectively. Direct
heritability, maternal heritability, and the genetic correlation between additive direct and maternal effects were 0.59, 0.17,
and −0.90 for BW; 0.29, 0.17, and −0.90 for WW; and 0.24, 0.15, and −0.86 for YW, respectively. The results showed moderate
direct and maternal heritabilities for the studied traits. The genetic correlations between direct and maternal effects were
negative and high for all the traits indicating important tradeoffs between direct and maternal effects. There are significant
possibilities for genetic progress for the growth traits studied if they are included in a breeding program considering these
associations. 相似文献
96.
97.
Williams-Linera Guadalupe Berry Z. Carter Díaz-Toribio Milton H. Espejel-Ontiveros Ximena 《New Forests》2022,53(3):571-585
New Forests - Eriobotrya japonica is a non-native tree expanding in secondary forests and threatening the tropical montane cloud forest of central Veracruz, Mexico. Our objective was to investigate... 相似文献
98.
Fagus grandifolia var. mexicana (Mexican beech) is limited to about 10 populations (2-35 ha) in the Sierra Madre Oriental, Mexico. The objectives were to assess the current status and distribution of beech by surveying five sites. Species richness varied between three to 27 tree species in the canopy, and from nine to 29 species in the understorey. Basal area of trees?5 cm dbh varied between 27.87 and 70.98 m2 ha−1, and density from 370 to 1290 individual ha−1. Beech represented 22-99.6% of total basal area, and 6.8-83.3% of total density. Beech dominance varied from monodominant to codominance with Carpinus caroliniana, Quercus spp., Liquidambar styraciflua, Magnolia schiedeana, and Podocarpus spp. Beech total population size ranged from 180 to 6300 trees with a total of less than 1300 individuals in four sites. Anthropogenic disturbance remains a major threat to these forests. It is uncertain whether Mexican beech will be able to survive without conservation efforts. 相似文献
99.
Rosario?IturbeEmail author Carlos?Flores Claudia?Chavez Guadalupe?Bautista Luis?G.?Torres 《Journal of Soils and Sediments》2004,4(2):115-122
Background, Aims and Scope An out-of-service oil distribution and storage station (ODSS), which operated from 1966 to 2000 in Mexico, is contaminated
mainly by gasoline and diesel, showing the presence of methyl-tert-butyl-ether, benzene, toluene, ethyl benzene, and xylenes.
Nine of the 16 polycyclic aromatic hydrocarbons were found, as well as Fe, Pb, V, and Zn. The health risk assessment suggested
the necessity of reducing of three PAHs [benzo(a)anthracene, benzo(a)pyrene, and benzo-(b)fluoranthene], and vanadium. The
aim of this work is to show that soil washing (on-site) and biopiles are excellent remediation methodologies to treat soils
contaminated with petroleum derivates and metals. Applying them, it is possible to reach the goal value of 2,000 mg TPH/kg
in a few months, as requested by Mexican legislation.
Methods More than 140 m3 were excavated from the ODSS. Three soil-washing dishes were built. 1540 m3 were treated by soil washing using a nonionic surfactant. A 100 m3 biopile was built to study the system capabilities in the biodegradation of around 4,500 mg/kg of TPH using the autochthonous
microflora.
Results and Discussion The soil washing, average TPH-removal value was 83%, but values up to ca. 93% were observed. Removal values resulted in a
function of the TPH initial values. Biopile (100 m3) worked during 66 days, reaching a TPH-removal value of 85%. At the end of the processes, no PAHs were detected. The contaminated
soil was treated successfully, reaching the legislation limits (TPH values under 2,000 mg/kg, and a significant reduction
in PAH concentrations).
Conclusion and Recommendation Both systems are suitable for remediation purposes, achieving high removal efficiencies at short and medium stages. It is
highly recommended to proceed with soil washing studies, identifying new products, and mixtures, which could reduce costs
and assure optimum operation. 相似文献
100.
Lorena A. Berruezo Guadalupe E. Mercado Cárdenas Eleonora del M. Harries Sebastián A. Stenglein Ramiro N. Curti Marcela S. Rodriguero Marta Z. Galván 《European journal of plant pathology / European Foundation for Plant Pathology》2018,150(4):1065-1081
Phenotypic traits are regularly used to diagnose the development of Fusarium head blight (FHB) in the field, whereas mycotoxin accumulation in wheat grains can only be accurately evaluated through costly methods, such as high–performance liquid chromatography (HPLC). The aim of this study was to determine whether: (i) the results provided by existing commercial decision support tools could be anticipated using phenotypic measurements, including a novel technique of computer–assisted image analysis of spikes; and (ii) these measurements could avoid using HPLC. We monitored the FHB development during two consecutive years in highly contaminated plots in the Burgundy region (France). Contamination by crop residues was simulated through a field inoculation with barley grains artificially colonized by Fusarium graminearum. The development of the disease on spikes and harvested grains was assessed on one tolerant and two susceptible wheat varieties. The accumulated amounts of mycotoxins were measured in harvested grains using HPLC. As expected, the measured traits revealed that the inoculum responsible for infection on spikes mainly came from residues left on the soil surface, and the susceptible varieties were more diseased than the tolerant variety. Weather conditions had a strong effect on disease development. The novel computer–assisted image analysis technique had a better prediction power of deoxynivalenol accumulation, was more objective and time–saving than classical visual symptom assessments. This assessment method could be suitable to supplement the use of existing prediction tools and might avoid systematic and costly mycotoxin measurements in likely infected plots. 相似文献