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Boron nitride for enhanced oxidative dehydrogenation of ethylbenzene

Journal of Energy Chemistry 2021年第6期30卷 477-484,I0012页

作者： Rui Han Jiangyong Diao Sonu Kumar Andrey Lyalin Tetsuya Taketsugu gilberto casillas Christopher Richardson Feng Liu Chang Won Yoon Hongyang Liu Xudong Sun Zhenguo Huang Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Civil and Environmental Engineering University of Technology SydneyUltimoNew South Wales 2007Australia Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporo 001-0021Japan Center for Green Research on Energy and Environmental Materials National Institute for Materials Science(NIMS)Tsukuba 305-0044Japan Department of Chemistry Faculty of ScienceHokkaido UniversitySapporo 060-0810Japan Electron Microscopy Centre University of WollongongNew South Wales 2500Australia Molecular Horizons and School of Chemistry and Molecular Bioscience Faculty of ScienceMedicine and HealthUniversity of WollongongNew South Wales 2522Australia Center for Hydrogen and Fuel Cell Research Korea Institute of Science and TechnologySeoul 02792Republic of Korea

It is demonstrated experimentally and confirmed theoretically that highly defective boron nitride showed outstanding performance for oxidative dehydrogenation of *** catalyst is derived from carbon-doped hexagonal boron nitride nanosheets synthesized via a two-step reaction when participating the oxidative dehydrogenation *** first step yields a polymeric precursor with the atomic positions of B,C,N relatively constrained,which is conducive for the formation of carbon atomic clusters uniformly dispersed throughout the BN *** the oxidative dehydrogenation of ethylbenzene to styrene,the nanoscale carbon clusters are removed and highly defective boron nitride(D-BN)is obtained,exposing boron-rich zigzag edges of BN that act as the catalytic *** catalytic performance of D-BN is therefore remarkably better than un-doped *** results indicate that dispersed C-doping in h-BN is highly effective in terms of defect formation and resultant enhanced activity in oxidative dehydrogenation reactions.

关键词： Boron nitride Dehydrogenation Ethylbenzene Carbon-doping Heterogeneous catalysis

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Activation and IL-1B secretion of human peripheral phagocytes infected with Actinomadura madurae,Nocardia asteroides and Candida albicans

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Asian Pacific Journal of Tropical Medicine 2016年第10期9卷 939-944页

作者： Alejandro Palma-Ramos gilberto casillas-Petriz Laura Estela Castrillon-Rivera Jorge Ismael Castaneda-Sanchez Roberto Arenas-Guzman Maria Elisa Drago-Serrano Teresita Sainz-Espunes Department of Biological Systems Autonomous Metropolitan University Campus XochimilcoCalzada del Hueso No.1100Ciudad de Mexico 04960Mexico Service of Dermatology and Mycology General Hospital ‘Manuel Gea Gonzalez’Calzada de Tlalpan 4800TlalpanSeceion XVI14080 Ciudad de MexicoMexico

Objective: To evaluate the ability of Actinomadura madurae(A. madurae) and Nocardia asteroids(N. asteroides), using Candida albicans(C. albicans) as prototypic control, to elicit the activation and IL-1β secretion of blood phagocytic cells from healthy donors. Methods: Microcopic evaluation of phagocytosis/activation, cell viability and spectrophotometric quantitation of endocytosis/activation, were assessed by using formazan blue test in human blood phagocytes infected with C. albicans, A. madurae or N. asteroides treated with either normal human serum(NHS) or with decomplemented NHS. Interlukin-1β from culture supernatants of infected polymorphonuclear was tested by ELISA kit assay. Results: Microscopic assay showed that phagocytosis and activation of adherent mononuclear phagocytes were greater with C. albicans followed by A. madurae and then by N. asteroides. Spectrophotometric assay in polymornuclear phagocytes infected with NHS-treated pathogens indicated that activation was similarly higher by C. albicans and A. madurae and lower by N. asteroides. Kinetic assays in infected polymorphonuclear cells showed that viability was decreased by C. albicans and N. asteroides or unaffected with A. madurae. Levels of IL-1β at 8 h of incubation were higher with C. albicans followed by A. madurae whereas lower levels were found with N. asteroides. Conclusions: The extent of cell-viability and activation as well IL-1β secretion may be related with the virulence of C. albicans and N. asteroides and other parameters remain to be explored for assesing the virulence of A. madurae.

关键词： Interleukin-1B Phagocytosis Actinomycetoma Formazan blue assay

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Trimetazidine:Is it a promising drug for use in steatotic grafts?

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World Journal of Gastroenterology 2006年第6期12卷 908-914页

作者： IsmailBenMosbah Aranícasillas-Ramírez CarmeXaus AnnaSerafín JoanRoselló-Catafau CarmenPeralta Department of Experimental Pathology Instituto de Investigaciones Biomédicas de Barcelona-Consejo Superior de Investigaciones Científicas Instituto de Investigaciones Biomédicas de Barcelona August Pii SunyerBarcelonaSpain

AIM： Chronic organ-donor shortage has led to the acceptance of steatotic livers for transplantation, despite the higher risk of graft dysfunction or nonfunction associated with the ischemic preservation period of these organs. The present study evaluates the effects of trimetazidine （TMZ） on an isolated perfused liver model. METHODS： Steatotic and non-steatotic livers were preserved for 24 h in the University of Wisconsin （UW） solution with or without TMZ. Hepatic injury and function （transaminases, bile production and sulfobromophthalein （BSP） clearance） and factors potentially involved in the susceptibility of steatotic livers to ischemia-reperfusion （I/R） injury, including oxidative stress, mitochondrial damage, microcirculatory diseases, and ATP depletion were evaluated. RESULTS： Steatotic livers preserved in UW solution showed higher transaminase levels, lower bile production and BSP clearance compared with non-steatotic livers. Alterations in perfusion flow rate and vascular resistance, mitochondrial damage, and reduced ATP content were more evident in steatotic livers. TMZ addition to UW solution reduced hepatic injury and ameliorated hepatic functionality in both types of the liver and protected against the mechanisms potentially responsible for the poor tolerance of steatotic livers to I/R. CONCLUSION： TMZ may constitute a useful approach in fatty liver surgery, limiting the inherent risk of steatotic liver failure following transplantation.

关键词： Steatotic liver Ischemia-reperfusion UW preservation solution

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Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid

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Chinese Physics B 2020年第10期29卷 186-194页

作者： S Rosales N casillas A Topete O Cervantes G González J A Paz M E Cano Centro Universitario de Ciencias Exactas e Ingenienas Universidad de GuadalajaraBlvd.Marcelino Garcia Burragan 1421C.P.44430GuadalajaraJaliscoMexico Centro Universitario de la Cienegu Universidad de GuadalajaraAv.Universidad 1115C.P.47820OcotlanJaliscoMexico Centro Universitario de Ciencias de In Salud Universidad de Guadalajara.Sierra Mojada 950C.P.44340GuadalajaraJaliscoMexico

The physical characterization of a colloidal system of superficially modified magnetic nanoparticles (MNPs) is presented. The system consists of oleic acid-coated iron oxide nanoparticles (OAMNP) suspended in water. A structural analysis is carried out by using standard physical techniques to determine the diameter and shape of the MNPs and also the width of the coating shell. The colloidal stability and the polydispersity index of this ferrofluid are determined by using Zeta potential measurements. Additionally, the magnetic characterization is conducted by obtaining the DC magnetization loops, and the blocking temperatures are determined according to the ZFC–FC protocol. Finally, the values of power absorption density P of the ferrofluid are estimated by using a magneto-calorimetric procedure in a wide range of magnetic field amplitude H and frequency f. The experimental results exhibit spherical-like shape of OAMNP with (20 ± 4) nm in diameter. Due to the use of coating process, the parameters of the magnetization loops and the blocking temperatures are significantly modified. Hence, while the uncoated MNPs show a blocking state of the magnetization, the OAMNP are superparamagnetic above room temperature (300 K). Furthermore, the reached dependence P versus f and P versus H of the ferrofluid with coated MNPs are clearly fitted to linear and quadratic correlations, respectively, showing their accordance with the linear response theory.

关键词： nanoparticles ferrofluid magnetic hyperthermia functionalization

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Role of vitamin C in diabetic ketoacidosis:Is it ready for prime time?

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World Journal of Diabetes 2018年第12期9卷 206-208页

作者： Sebastian casillas Alan Pomerantz Salim Surani Joseph Varon Dorrington Medical Associates PAHoustonTX 77030United States Division of Pulmonary Critical Care and Sleep MedicineTexas A and M UniversityHealth Science CenterCorpus ChristiTX 78414United States Acute and Continuing Care The University of Texas Health Science Center at HoustonHoustonTX 77030United States Department of Medicine the University of TexasMedical Branch at GalvestonHoustonTX 77030United States Critical Care Services United Memorial Medical Center/United General HospitalHoustonTX 77030United States

Diabetic ketoacidosis(DKA) is life-threatening acute metabolic complication of diabetes mellitus(DM) that is characterized by acidosis, ketosis, and hyperglycemia, currently affecting mostly patients under 30 years of age with diabetes mellitus type 1. In both, DM and DKA, a pro-inflammatory state exists. This clinical entity occurs as a result of hyperglycemia-induced disturbances, resulting in an increased oxidative metabolism. For the latter reason, the use of vitamin C seems promising in DKA due to its antioxidant role in reducing the superoxide radicals that are consequence of the oxidative stress. This can decrease the proinflammatory state and avoids complications. Vitamin C, or also known as ascorbic acid, has been widely used in several illnesses, such as common cold, tissue healing, fertility, atherosclerosis, cancer prevention, immunity restoration, neuro-degenerative disease and also has been suggested to decrease the risk of DM, and this reason is giving place to believe that vitamin C can have an important role in treating diabetic complications such as DKA. In order to counteract these oxidative disturbances in DKA patients, we analyzed the current data regarding vitamin C and evaluate its role in any type treatment of this complication in the near future.

关键词： Vitamin C Diabetes complications Ascorbic acid Diabetic ketoacidosis Diabetes mellitus

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Use of By-Products from the Tequila Industry. Part 12: Composted Agave Bagasse for Growing Grape Tomatoes

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American Journal of Plant Sciences 2022年第9期13卷 1227-1232页

作者： gilberto Íñiguez-Covarrubias Walter Ramírez-Meda José De Jesús Bernal-casillas Gil Virgen-Calleros Departamento de Madera Celulosa y Papel Centro Universitario de Ciencias Exactas e Ingenierías Universidad de Guadalajara Guadalajara México Departamento de Ingeniería de Proyectos Centro Universitario de Ciencias Exactas e Ingenierías Universidad de Guadalajara Guadalajara México Departamento de Producción Agrícola Centro Universitario de Ciencias Biológicas y Agropecuarias Universidad de Guadalajara Guadalajara México

Here, we evaluated the possibility of growing grape tomatoes on three different mixtures of composted agave bagasse substrate. Tomatoes were grown in 28-L pots for 106 days under a drip irrigation system with a hydroponic crop nutrient solution. The average production of grape tomatoes was 338.9, 358.9, and 325.7 g/pot/cut for each of the substrates studied, and no significant difference was observed between treatments (p > 0.5). The mean of numbers of grape tomatoes were 34.6, 38.8, and 34.2/pot/cut for each of the substrates studied, and no significant difference was observed between treatments (p > 0.5). The mean weight of individual grape tomatoes was about 10.4 g for all of the substrates tested. These results confirmed the notion that a composted agave bagasse substrate could replace an expensive imported substrate. The remaining challenge is to produce agave bagasse substrate commercially, because to date, agave bagasse substrates have only been produced on a pilot scale for testing. Therefore, it is necessary to implement a stabilized process for producing agave bagasse at a commercial level. This process must consider economic production costs and market value to ensure that the product is competitive with other substrates typically used in soilless crops.

关键词： Agave Bagasse Grape Tomatoes Tequila Industry

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Assessing availability, phytotoxicity and bioaccumulation of lead to ryegrass and millet based on 0.1 mol/L Ca(NO_3)_2 extraction

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Journal of Environmental Sciences 2006年第5期18卷 958-963页

作者： SI Ji-tao TIAN Bao-guo WANG Hong-tao Nicholas Basta Jackie Schroder Mark casillas Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China School of Natural Resources The Ohio State University Columbus OH 43210 USA Department of Plant and Soil Sciences Oklahoma State University Stillwater Oklahoma 74078 USA

This study was conducted to assess availability, phytotoxicity and bioaccumulation of lead （Pb） to ryegrass （Lolium perenne L.） and millet （Echinochloa crusgalli） based on the 0.1 mol/L Ca（NO3）2 extraction. Effect of soil properties on availability, phytotoxicity and bioaccumulation of Pb to the two plants was also evaluated. Five soils with pH values varying from 3.8 to 7.3, organic carbon （OC） contents from 0.7% to 2.4%, and clay contents from 11.6% to 35.6% were selected. Soils were spiked with Pb to achieve a range of concentrations： 250, 500, 1000, 3000 and 5000 mg/kg. Pb availability in the spiked soils was estimated by extracting soil with 0.1 mol/L Ca（NO3）2. The results indicate that plants yield decreased with decreasing soil pH and increased with increasing soil clay and OC content. Negative relationship between available Pb and the relative dry matter growth （RDMG） of the two plants were significantly related. Available Pb used to assess EC20 （20% effective concentration） and EC50 （50% effective concentration） of millet was 119 and 300 mg/kg, respectively. Available Pb used to assess EC20 and EC50 of ryegrass was 63 and 157 mg/kg, respectively. Bioaccumulation, expressed as bioconcentration factors of Pb, was inversely related to soil pH, soil OC and clay content. Strong relationships were found between available lead and uptake by the two plants （P was 0.92 and 0.95 respectively）. In general, 0.1 mol/L Ca（NO3）2 available Pb may be used to assess the availability, phytotoxicity and bioaccumulation of lead to the two plants tested.

关键词： heavy metals bioconcentration factor spike extraction lead (Pb)

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Composting of Food and Yard Wastes under the Static Aerated Pile Method

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Advances in Chemical Engineering and Science 2018年第4期8卷 271-279页

作者： gilberto Í ñ iguez-Covarrubias Rodrigo Gó mez-Rizo Walter Ramírez-Meda José de Jesús Bernal-casillas Departamento de Madera Celulosa y Papel Centro Universitario de Ciencias Exactas e Ingenierías Universidad de Guadalajara Guadalajara México El Morado Compost S.A. de C.V. Guadalajara México Departamento de Ingeniería de Proyectos Centro Universitario de Ciencias Exactas e Ingenierías Universidad de Guadalajara Guadalajara México

This work presents the results that were obtained in a commercial composting plant where food (149,690 kg) and yard wastes (144,520 kg) were used as raw materials for its stabilization under the aerated static pile (ASP) method as an alternative to the mechanically mixed windrow method to solve problems of flies and odor nuisance complaints. In a pile of approximately 498 m3, the change in temperature was the main parameter that was evaluated during 49 days of positive forced aeration. Subsequently, a part of the material of the ASP (62 m3) was subjected to a curing period for 44 days recording changes in temperature and humidity. The results of carbon dioxide and volatile ammonia emissions analyses (NH3) and of a bioassay to screen for the presence of phytotoxic conditions showed a very mature compost with an emergence > 90% and a seedling vigor > 95%.

关键词： Aerated Static Pile Composting Compost

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Analysis of per-and polyfluoroalkyl substances in Houston Ship Channel and Galveston Bay following a large-scale industrial fire using ion-mobility-spectrometry-mass spectrometry

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Journal of Environmental Sciences 2022年第5期34卷 350-362页

作者： Alan Valdiviezo Noor AAly Yu-Syuan Luo Alexandra Cordova Gaston casillas MaKayla Foster Erin SBaker Ivan Rusyn Interdisciplinary Faculty of Toxicology Texas A&M UniversityCollege StationTX 77843USA Department of Veterinary Integrative Biosciences Texas A&M UniversityCollege StationTX 77843USA Department of Environmental and Occupational Health Texas A&M UniversityCollege StationTX 77843USA Department of Chemistry North Carolina State UniversityRaleighNC 27695USA

Per-and polyfluoroalkyl substances(PFAS)are persistent organic pollutants of concern be-cause of their ubiquitous presence in surface and ground water;analytical methods that can be used for rapid comprehensive exposure assessment and fingerprinting of PFAS are *** the fires at the Intercontinental Terminals Company(ITC)in Deer Park,TX in 2019,large quantities of PFAS-containing firefighting foams were *** release of these substances into the Houston Ship Channel/Galveston Bay(HSC/GB)prompted con-cerns over the extent and level of PFAS contamination.A targeted liquid chromatography-tandem mass spectrometry(LC-MS/MS)-based study of temporal and spatial patterns of PFAS associated with this incident revealed presence of 7 species;their levels gradually de-creased over a 6-month *** the targeted LC-MS/MS analysis was focused on about 30 PFAS molecules,it may have missed other PFAS compounds present in firefighting ***,we utilized untargeted LC-ion mobility spectrometry-mass spectrome-try(LC-IMS-MS)-based analytical approach for a more comprehensive characterization of PFAS in these water *** analyzed 31 samples from 9 sites in the HSC/GB that were collected over 5 months after the *** data showed that additional 19 PFAS were detected in surface water of HSC/GB,most of them decreased gradually after the *** features detected by LC-MS/MS correlated well in abundance with LC-IMS-MS data;however,LC-IMS-MS identified a number of additional PFAS,many known to be compo-nents of firefighting *** findings therefore illustrate that untargeted LC-IMS-MS improved our understanding of PFAS presence in complex environmental samples.

关键词： Emergency Environmental disaster PFAS

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Characteristics of Toxic Waste from Nine Casting Industries According to Mexican Standards:Prospective Study of West Mexico

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Journal of Geoscience and Environment Protection 2017年第3期5卷 43-49页

作者： Walter Ramírez-Meda José de Jesús Bernal-casillas Luis Alberto López-Tejeda gilberto íniguez-Covarrubias Departamento de Ingeniería de Proyectos Universidad de GuadalajaraCUCEIGuadalajaraMéxico

This research analyzed nine casting industries located in western Mexico and their waste streams, including slags, sand, dust and sludge. All of these are considered dangerous by Mexican Legislation due to their concentrations of heavy metals. Analytical results show that lead is the main problem in these wastes. Field sampling showed that these industries do not have any protocol for waste handling and storage.

关键词： Dangerous Waste Metal Casting Slag Sand Mexican Legislation TCLP

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