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Photodegradation and Removal of Diclofenac by the Green Alga Nannochloropsis oculata

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Phyton-International Journal of Experimental Botany 2021年第5期90卷 1519-1533页

作者： Danaé Samara Sánchez-sandoval Omar González-Ortega Mara Fernanda Navarro-Martínez Juan Marcos Castro-Tapia Ramón Fernando García de la Cruz Ruth Elena Soria-Guerra Facultad de Ciencias Químicas Universidad Autónoma de San Luis PotosíSan Luis Potosí78210México

The emerging contaminants(ECs)are organic compounds including *** products are consumed in large quantities,favoring their continuous entrance to the environment and affecting the health of living *** is a non-steroidal anti-inflammatory drug with analgesic properties of prolonged *** is the commonest postoperative analgesic,and it is highly consumed without *** recent years,the capability of microalgae to remove pharmaceuticals in water has been tested as a promising *** this work,the removal efficiency of diclofenac(16µg/mL)by the microalga Nannochloropsis oculata CCAP 186/7 was *** major nutrient concentrations in Bold’s Basal Medium were modified(nitrogen and carbon:50 and 100%of their original concentration)to know their effect in the removal of *** degradation by light was also *** maximum removal capacity of diclofenac in the medium was 68.8%.The percentage of diclofenac adsorbed on the cell wall was between 6 and 12.7%.Around 23.6%of diclofenac was degraded by light after 18 *** did not show growth inhibition due to the presence of *** results obtained point to the promissory application of *** as a bioremediation system for diclofenac removal.

关键词： Adsorption emerging contaminants microalgae pharmaceuticals phycoremediation photodegradation

Photocatalytic performance of K2Ti6O13 whiskers to H2 evolution and CO2 photo-reduction

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Journal of Energy Chemistry 2019年第10期28卷 18-28页

作者： L. F. Garay-Rodríguez L.M.Torres-Martínez E.Moctezuma Facultad de Ingeniería Civil-departamento de Ecomateriales y Energía Universidad Autónoma de Nuevo LeónAv. Universidad S/N Cd. UniversitariaC. P. 66455 San Nicolás de los GarzaNLMéxico Facultad de Ciencias Químicas Universidad Autónoma de San Luis PotosíAv. Manuel Nava#6C. P.78290 San Luis PotosíSLPMéxico

K2Ti6O13 whiskers were synthesized by conventional sol-gel method, sono-chemical assisted and microwave assisted sol-gel method in order to obtain catalysts with different particle sizes and to modify their optical, textural and electrochemical properties. These modifications improved their photocatalytic activity for H2 evolution and CO2 photo-reduction. Long K2Ti6O13 whiskers prepared by ultrasound assisted sol-gel method are the most active photocatalysts for the hydrogen evolution reaction using pure water as reactant (U-SG, 10,065 μmol g^-1). In contrast, an opposite behavior was observed using a mixture of ethanol-water, where the highest activity was achieved by the shortest and less crystalline K2Ti6O13 whiskers (C-SG, 3,2871 μmol g^-1). In case of CO2 photo-reduction, long whiskers that were also prepared by the sono-chemical assisted sol-gel method were the most active to transform CO2 to formaldehyde, methane, methanol and hydrogen. The EFB value of this catalyst is located very close to the potential for formaldehyde production and favors the selectivity to this organic product.

关键词： K2Ti6O13 Sol-gel Whiskers Hydrogen evolution CO2 reduction

Patch isolation and shape predict plant functional diversity in a naturally fragmented forest

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Journal of Plant Ecology 2018年第1期11卷 136-146页

作者： Amaranta Arellano-Rivas J.Arturo de-Nova Miguel A.Munguía-Rosas Instituto de Investigación de Zonas desérticas Universidad Autónoma de San Luís PotosíSan Luis Potosí78377México Laboratorio de Ecología Terrestre Departamento de Ecología HumanaCentro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional(CINVESTAV)Mérida 97310México Facultad de Agronomía Universidad Autónoma de San Luís PotosíSan Luis Potosí78321México

Aims It is known that taxonomic diversity can be predicted by the spatial configuration of the habitat,in particular by its area and degree of ***,taxonomic diversity is a poor predictor of ecosystem *** functional diversity is strongly linked to the func-tionality and stability of ecosystems,little is known about how changes in the spatial configuration of the habitat affect functional *** this study,we evaluated whether the spatial configuration of forest patches predicts the functional diversity of plants in a fragmented *** Five functional leaf traits(leaf dry matter content,leaf punch force,specific leaf area,leaf size and leaf thickness)were measured for 23 dominant plant species in 20 forest patches in a naturally fragmented forest on the yucatan ***-weighted multivariate and individual trait metrics of functional diversity were calculated and cor-related with size,degree of isolation and the shape of forest *** Findings Patch shape was negatively correlated with multivariate and individ-ual trait(leaf dry matter content and leaf size)metrics of functional *** isolation measures were also negatively correlated with individual trait(leaf dry matter content,leaf punch force and leaf size)metrics of functional *** other words,greater patch shape irregularity and isolation degree impoverish plant func-tional *** is the first report of the negative effects of patch shape irregularity and isolation on the functional diversity of plant communities in a forest that has been fragmented for a long time.

关键词： forest fragmentation functional diversity habitat spatial configuration petenes yucatan

Facilitation by nurse plants contributes to vegetation recovery in human-disturbed desert ecosystems

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Journal of Plant Ecology 2016年第5期9卷 485-497页

作者： Ernesto I.Badano Omar R.Samour-Nieva Joel Flores JoséL.Flores-Flores Jorge A.Flores-Cano Juan P.Rodas-Ortíz División de Ciencias Ambientales Instituto Potosino de Investigación Científica y TecnológicaA.C.Camino a la Presa San José2055Colonia Lomas 4ta SecciónC.P.78216San Luis PotosíMéxico Instituto de Investigación de Zonas desérticas Universidad Autónoma de San Luis PotosíAltair 200Fraccionamiento del LlanoC.P.78377San Luis PotosíMéxico Facultad de Agronomía Universidad Autónoma de San Luis PotosíKm.14.5 Carretera San Luis-MatehualaApdo.Postal 32Soledad de Graciano SánchezC.P.78321San Luis PotosíMéxico

Aims Facilitation by nurse plants is a common interaction in harsh environments and this positive plant-plant interaction may promote vegetation recovery in ecosystems affected by human *** the relevance of this process,however,requires assessing how nurse plants influence the establishment of other species,as well as the proportion of species in the regional species pool that would benefit from the presence of nurse plants in human-disturbed ***,since vegetation recovery is a time-dependent process,the community-level consequences of facilitation are likely to vary among landscapes with different disturbance ***,an integrative perspective of the relevance of nurse plants for vegetation recovery could be obtained by measuring their effects across different human-disturbed landscapes of the target *** study focuses on these issues and uses a regional-scale approach to assess the community-level effects of a widespread nurse plant of American deserts,the creosotebush(Larrea tridentata).Methods This study was conducted in the southernmost portion of Chihuahuan desert because most floodplain valleys of this region have been affected by human activities during the past *** this study,we selected 10 floodplain valleys differing in their age(*** time elapsed after human activities were ceased).At each landscape,we measured the cover of creosotebushes and the proportion of plant species positively associated with them,as well as the density of seeds in the soil beneath creosotebush *** these data were regressed against the age of the ***,to assess whether positive association patterns were due to facilitation or other processes,we conducted field experiments and measured the ecophysiological performance of plant species established beneath and outside creosotebush *** Findings Most plant species from the target region were positively associated to creosotebushes,and our field

关键词： Chihuahuan desert community-level effects community succession positive interactions Mexico

determination of the solvation film thickness of dispersed particles with the method of Einstein viscosity equation

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Journal of University of Science and Technology Beijing 2005年第4期12卷 370-375页

作者： Changsheng Peng Shaoxian Son Shouci Lu College of Environmental Science and Engineering Ocean University of China Qingdao 266003 China Instituto de Metalurgia Universidad Autónoma de San Luis Potosí Av. Sierra Leona 550 San Luis Potosí C.P. 78210 Mexico Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

The dispersion of a solid particle in a liquid may lead to the formation of solvation film on the particle surface, which can strongly increase the repulsive force between particles and thus strongly affect the stability of dispersions. The solvation film thickness, which varies with the variation of the property of suspension particles and solutions, is one of the most important parameters of the solvation film, and is also one of the most difficult parameters that can be measured accurately. In this paper, a method, based on the Einstein viscosity equation of dispersions, for determining the solvation film thickness of particles is developed. This method was tested on two kinds of silica spherical powders （namely M1 and M2） dispersed in ethyl alcohol, in water, and in a water-ethyl alcohol mixture （1：1 by volume） through measuring the relative viscosity of dispersions of the particles as a function of the volume fraction of the dry particles in the dispersion, and of the specific surface area and the density of the particles. The calculated solvation film thicknesses on M1 are 7.48, 18.65 and 23.74 nm in alcohol, water and the water-ethyl alcohol mixture, 12.41, 12.71 and 13.13 nm on M2 in alcohol, water and the water-ethyl alcohol mixture, respectively.

关键词： solvation film viscosity film thickness Einstein viscosity equation

Modeling susceptibility to deforestation of remaining ecosystems in North Central Mexico with logistic regression

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Journal of Forestry Research 2012年第3期23卷 345-354页

作者： L.Miranda-Aragón E.J.Trevi o-Garza J.Jiménez-Pérez O.A.Aguirre-Calderón M.A.González-Tagle M.Pompa-García C.A.Aguirre-Salado Facultad de Ciencias Forestales Universidad Autónoma de NuevoLeón67700Linares NLMexico Facultad de Ciencias Forestales Universidad Juárez del Estado deDurango34120Durango DgoMexico Facultad de Ingeniería Universidad Autónoma de San Luis Potosí78290San Luis Potosi SLPMexico

determining underlying factors that foster deforestation and delineating forest areas by levels of susceptibility are of the main challenges when defining policies for forest management and planning at regional scale. The susceptibility to deforestation of remaining forest ecosystems （shrubland, temperate forest and rainforest） was conducted in the state of san luis potosi, located in north central Mexico. Spatial analysis techniques were used to detect the deforested areas in the study area during 1993-2007. Logistic regression was used to relate explana- tory variables （such as social, investment, forest production, biophysical and proximity factors） with susceptibility to deforestation to construct predictive models with two focuses： general and by biogeographical zone In all models, deforestation has positive correlation with distance to rainfed agriculture, and negative correlation with slope, distance to roads and distance to towns. Other variables were significant in some cases, but in others they had dual relationships, which varied in each biogeographi- cal zone. The results show that the remaining rainforest of Huasteca region is highly susceptible to deforestation. Both approaches show that more than 70% of the current rainforest area has high and very high levels of susceptibility to deforestation. The values represent a serious concern with global warming whether tree carbon is released to atmos- phere. However, after some considerations, encouraging forest environ- mental services appears to be the best alternative to achieve sustainableforest management.

关键词： GIS land use change proximity factors statistical modeling ROC curve regional forest planning

Influence mechanism of Fe^(3+)doping on the hydrophobic regulation of kaolinite/water interface:Experiments and MD simulations

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International Journal of Mining Science and Technology 2024年第11期34卷 1575-1586页

作者： Jun Chen Huanhuan Shang Yunjia Ling Feifei Jia Yali Cheng Fanfei Min department of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Doctorado Institucional de Ingeniería y Ciencia de Materiales Universidad Autónoma de San Luis Potosí(UASLP)Sierra Leona 530San Luis Potosí78210Mexico School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

The surface/interfacial reactivity of clay is a critical factor influencing the sedimentation of coal slurry *** achieve efficient sedimentation of coal slurry water,this paper introduces a novel approach that regulates the hydrophobicity of defective active sites in clay ***^(3+)-doped kaolinite(Fe^(3+)-Kao)was synthesized by hydrothermal ***,tests were conducted on the adsorption capacity,surface wettability,and agglomeration sedimentation of alkyl amine/ammonium salts(AAS)on Fe^(3+)-Kao ***^(3+)doping significantly enhances AAS adsorption and alters surface properties from hydrophilic to hydrophobic,promoting kaolinite particle aggregation and sedimentation,thereby improving coal slurry water treatment *** dynamics(MD)simulations were performed to analyze the statistical adsorption behavior of AAS on Fe^(3+)-Kao *** simulation results indicate that the mechanism by which Fe^(3+)doping influences the hydrophobic regulation of kaolinite surfaces is due to the enhanced interfacial interactions between the kaolinite surface and AAS,where the interfacial effects are more pronounced on surfaces closer to the dopant *** findings of this research offer valuable insights for future studies on other types of lattice defects in clay minerals,as well as for the development of more efficient treatment chemicals for coal slurry water.

关键词： Kaolinite Fe^(3+)doping Hydrophobic regulation Hydrothermal synthesis Molecular dynamics

Structural Comportment of Extract of Bougainvillea xbuttiana Flower Incorporated in Silica Xerogel Matrix

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American Journal of Plant Sciences 2016年第6期7卷 828-833页

作者： José Martínez-Mendoza Erika Espericueta-González Diana Espericueta-González Gerardo Ortega-Zarzosa Azdrubal Lobo Guerrero departamento de Físico-Matemáticas Universidad Autónoma de San Luis Potosí San Luis Potosí México Facultad de Ciencias Universidad Autónoma de San Luis Potosí San Luis Potosí México Facultad de Ingeniería Universidad Autónoma de San Luis Potosí San Luis Potosí México Doctorado Institucional de Ciencia e Ingeniería de Materiales Universidad Autónoma de San Luis Potosí San Luis Potosí México Instituto de Física Universidad Autónoma de San Luis Potosí San Luis Potosí México

Measurement of the fluorescence comportment of Bougainvillea xbuttiana flowers embedded in silica xerogels matrix prepared with two different water to tetraethyl-orthosilicate [Si(OC2H5)4] ratio molar of 11 and 5, without heat-treatment, we report the grade of biostability of compound. The structural comportment for the PSI and PSII present in Bougainvillea flower is similar to the structural comportment for these photosystems present in leaves when they are incorporated on inorganic matrix such as silica xerogels. The contribution of the natural pigment of this kind of flower such as betalains which consist of betaxanthins and betacyanins, determines their colors contributed in the range of wavelength from about 550 nm to 660 nm.

关键词： Betalaine Chlorophyll Structure Biostability Sol-Gel

Thermo-Stability of Natural Products Based on Chlorophyll Species Embedded in Silica Xerogel

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American Journal of Analytical Chemistry 2016年第4期7卷 356-362页

作者： José Martínez-Mendoza Erika Espericueta-González Diana Espericueta González Gerardo Ortega-Zarzosa Azdrubal Lobo Guerrero departamento de Físico-Matemáticas Universidad Autónoma de San Luis Potosí San Luis Potosí México Facultad de Ciencias Universidad Autónoma de San Luis Potosí San Luis Potosí México Facultad de Ingeniería Universidad Autónoma de San Luis Potosí San Luis Potosí México Doctorado Institucional de Ciencia e Ingeniería de Materiales Universidad Autónoma de San Luis Potosí San Luis Potosí México Instituto de Física Universidad Autónoma de San Luis Potosí San Luis Potosí México

This work studied the thermostability and the biostability of chlorophyll species obtained from an extract of spinach leaves embedded in a silica xerogel matrix. The analysis was done by monitoring the photosystem II (PSII) using fluorescence spectroscopy. Samples were prepared using the sol gel method with a molar ratio of ethanol/H2O/TEOS of 4:11.6:1. Then, silica xerogel matrix was loaded with an extract of spinach leaves, obtained in dark conditions. The measurement of the fluorescence spectra was done at selected temperatures to the corresponding non-physiological regimen. Results indicate that the PSII band position remains unchanged when heat treatment temperature increases up 200°C. For temperatures above 100?C, the fluorescence intensity diminishes linearly when the temperature increases. The photosystem II embedded in silica xerogel matrix is decomposed at temperatures above 200°C.

关键词： Chlorophyll Structure Biostability Sol-Gel