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Interpenetrating polymers supported on microporous polypropylene membranes for the transport of chromium ions

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Chinese Journal of Chemical Engineering 2017年第7期25卷 938-946页

作者： Yesid Tapiero Julio Sánchez Bernabél.rivas Polymer Department Faculty of ChemistryUniversity of ConcepdonCasilla 160-C ConcepcionChile

Modifying polypropylene membranes with interpenetrating polymer networks(IPNs) through the incorporation of poly(glycidyl methacrylate-N-methyl-D-glucamine)(P(GMA-NMG)) was performed by in situ synthesis via radical polymerization. The surface of the polypropylene membrane was activated by hydrophilic grafted polyelectrolyte, and then, pressure injection was used for the impregnation of the reactive solution in the *** types of pore-filled membranes were synthesized, chelating interpenetrating homopolymer networks of P(GMA-NMG), and chelating-ion exchange interpenetrating polymer networks(e.g., P(GMA-NMG)/P(AA),P(GMA-NMG)/P(AMPSA), and P(GMA-NMG)/P(Cl VBTA)). After their synthesis, the modified polypropylene membranes were characterized using techniques such as the electrokinetic potential, SEM, FT-IR, and Donnan dialysis to corroborate the chromium ion transport. The P(GMA-NMG) and complex network membranes exhibited a hydrophilic character with a water-uptake capacity between 20% and 35% and a percentage of modification between 4.0% and 7.0% in comparison with the behavior of the unmodified polypropylene *** chromium ions were efficiently transported from the food chamber at p H 9.0 when the 65.2%MTA1 P(Cl VBTA) homopolymer IPN membrane and 48.5% MTAG P(GMA-NMG)/P(Cl VBTA) IPN membrane were used. Similarly, hexavalent chromium ions were removed from the food chamber at pH 3.0 when MTAG(63.30%) and MTA1(35.68%) were used in 1 mol·l^(-1)Na Cl solution as the extraction reagent.

关键词： Polypropylene N-methyI-D-glucamine Ion exchange Donnan dialysis Interpenetrating polymer networks Chromium

Adsorbents Derived from Xylan Hemicellulose with Removal Properties of Pollutant Metals

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Chinese Journal of Polymer Science 2023年第6期41卷 874-886,I0007页

作者： Elizabeth Elgueta Yerko Becerra Ana Martínez Miguel Pereira Isabel Carrillo-Varela Felipe Sanhueza Dariela Nuez Bernabél.rivas Centro de Investigación de Polímeros Avanzados CIPAAvenida Collao 1202Edificio de LaboratoriosConcepcionChile Departamento de Química Ambiental Facultad de CienciasUniversidad Católica de la Santísima ConcepciónCaila 160-cConcepcionChile Polymer Department Faculty of ChemistryUniversity of ConcepciónCasilla 160-CConcepcionChile Departamento de Ingeniería Química Facultad de IngenieríaUniversidad de ConcepciónConcepcionChile Department of Materials Engineering Faculty of EngineeringUniversidad de ConcepciónConcepcionChile

The adsorption capacity of hydrogels derived from modified xylan hemicellulose has been tested in order to develop new bio-based adsorbent materials useful for removing metal ions pollutants,such as Cd(Ⅱ),Cu(Ⅱ)and Pb(Ⅱ)from an aqueous *** was extracted from bleached kraft pulp of eucalyptus and subsequently modified with different proportions of functional sulfonic acid groups(HA3-HA7)and sulfonate groups(HS30-HS70)to generate *** results showed that all the synthesized hydrogels were capable of adsorbing metal ions,being the hydrogels with 30%and 50%xylan the ones that presented the highest adsorption *** capacity studies at different initial concentrations revealed that at an initial concentration of 300 mg·l-1,the HA3 hydrogel presented an adsorption capacity of 193mg Pb(Ⅱ),182 mg Cd(Ⅱ),and 66 mg Cu(Ⅱ)per g *** HA5 hydrogel presented a capacity of 185 mg Pb(Ⅱ),113 mg Cd(Ⅱ),and 48 mg Cu(Ⅱ)per g *** HS30 hydrogel exhibited an adsorption of 205 mg Pb(Ⅱ),174 mg Cd(Ⅱ),and 71 mg Cu(Ⅱ)per g hydrogel,and HS50 hydrogel exhibited an adsorption capacity of 273 mg Pb(Ⅱ),143 mg Cd(Ⅱ),and 45 mg Cu(Ⅱ)per g *** results show that modified Xylan hemicellulose is a promising adsorbent for removal Cd(Ⅱ),Cu(Ⅱ),and Pb(Ⅱ)ions from aqueous solutions.

关键词： Pb(Ⅱ) solution capacity

Waveform liDAR concepts and applications for potential vegetation phenology monitoring and modeling:a comprehensive review

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Geo-Spatial Information Science 2021年第2期24卷 179-200,I0001页

作者： Eric ariel l Salas Agricultural Research Development Program(ARDP) Central State UniversityWilberforceUSA

Researchers continually demonstrated through published literature how liDAR could create unparalleled measurements of ecosystem structure and forest *** are a number of studies conducted utilizing waveform liDAR products for terrestrial monitoring,but those that deal specifically with the assessment of space-borne waveform liDAR for monitoring and modeling of phenology is very *** review highlights the waveform liDAR system and looks into satellite sensors that could link waveform liDAR and vegetation phenology,such as the proposed NASA’s Global Ecosystem Dynamics Investigation(GEDI)and the Japanese Experimental Module(JEM)-borne liDAR sensor named MOlI(Multi-footprint Observation lIDAR and Imager).Further,this work examines the richness and utility of the waveform returns and proposes a spline-function-derived model that could be exploited for estimating the leaf-shooting *** new approach may be utilized for ecosystem-level phenological studies.

关键词： Ecosystems gedi moli phenology vegetation modeling waveform liDAR

High diversity of Graphidaceae (lichenized Ascomycota: Ostropales) in Amazonian Perú

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Fungal Diversity 2013年第1期58卷 13-32页

作者： Eimy rivas Plata Robert lücking Department of Biological Sciences University of Illinois-Chicago845 West Taylor Street(MC 066)ChicagoIL 60607USA Department of Botany The Field Museum1400 South Lake Shore DriveChicagoIL 60605-2496USA

A survey of crustose microlichens at los Amigos Biological Station in Amazonian Peru revealed 116 species of Graphidaceae at this *** is the second highest number of Graphidaceae ever reported for a single site world-wide,after the Surumoni crane station in Venezuela,with 131 species,and followed by Fakahatchee Strand Park Preserve in Florida,with 111 *** on the number of Graphidaceae found at los Amigos,we predict the total lichen species richness at this site to be approximately 700 *** the 116 species encountered at los Amigos,59 were graphidoid species(former Graphidaceae ***.)and 67 thelotremoid species(former Thelotremataceae).The following 18 species are described as new:Ampliotrema sorediatum rivas Plata&lücking,***,Chapsa hypoconstictica rivas Plata&lücking,***,Chapsa scabiocarpa rivas Plata&lücking,***,Chapsa subsorediata rivas Plata&lücking,***,Diorygma nigricans rivas Plata&lücking,***,Fissurina flavomedullosa rivas Plata&lücking,***,Fissurina platythecioides rivas Plata&lücking,***,Graphis apertoinspersa rivas Plata&lücking,***,Graphis pitmanii rivas Plata&lücking,***,leucodecton inspersum rivas Plata&lücking,***,Ocellularia cicra rivas Plata&lücking,***,Ocellularia fenestrata rivas Plata&lücking,***,Ocellularia microsorediata rivas Plata&lücking,***,Ocellularia natashae rivas Plata&lücking,***,Ocellularia plicata rivas Plata&lücking,***,Ocellularia protoinspersa rivas Plata&lücking,***,Ocellularia pustulata rivas Plata&lücking,***,and Thelotrema amazonicum rivas Plata&lücking,***.

关键词： lichens Thelotremoid Tropical Rainforest Corticolous Madre de Dios

landform type mediates compositional change in a hurricane-disturbed subtropical forest

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Ecological Processes 2020年第1期9卷 292-304页

作者： Robert l.Spicer ariel Elugo Nathan Ruhl Department of Biological Science Rowan UniversityGlassboroNJ 08028USA International Institute of Tropical Forestry United States Department of Agriculture Forest ServiceJardín Botánico SurRío PiedrasPRUSA

Background:Categorization of topographical features into landform type is a long-standing method for understanding physiographic patterns in the *** in forest composition between landform types are driven primarily by concurrent differences in soil composition and moisture,but also disturbance *** studies have focused on the interaction between fire disturbance,succession,and landforms,but the effects of hurricane disturbance on compositional differences between landforms are poorly *** the study presented here,we assess compositional and structural differences between landform types in the tree community of a young sub-tropical forest that is frequently subjected to ***,we ask whether the tree community(1)changed structurally over the study period,(2)experienced compositional change over the study period,(3)is compositionally different between landform types,and(4)exhibits compositional change mediated by landform ***:The tree community experienced significant structural change over the course of our study,but compositional change was only significant for some ***:Despite large-scale,intense,and frequent hurricane disturbance to our study system,compositional change in the tree community was localized and only significant for some landform types.

关键词： Hurricane Forest Community Composition Change Succession landform

A new classification for the family Graphidaceae(Ascomycota:lecanoromycetes:Ostropales)

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Fungal Diversity 2012年第1期52卷 107-121页

作者： Eimy rivas Plata Robert lücking H.Thorsten lumbsch Department of Biological Sciences University of Illinois-Chicago845 West Taylor Street(MC 066)ChicagoIL 60607USA Department of Botany The Field Museum1400 South Lake Shore DriveChicagoIL 60605-2496USA

A revised classification for the emended family Graphidaceae is proposed,based on recent phylogenetic studies,including the finding that three previously separated families(Asterothyriaceae,Gomphillaceae,Thelotremataceae)are nested within Graphidaceae and in part *** family comprises three major clades which are here delimited as subfamilies Fissurinoideae,Gomphilloideae,and *** latter is composed of three major clades which are formally delimited as tribes Graphideae,Ocellularieae,and *** addition,three new genera are described to accommodate the Ocellularia clandestina(Clandestinotrema)group,the Ocellularia cruentata group(Cruentotrema)and Myriotrema pycnoporellum(Pycnotrema).

关键词： Asterothyriaceae Classification Gomphillaceae Thelotremataceae

Biofiltration of the antibacterial drug sulfamethazine by the species Chenopodium quinoa and its further biodegradation through anaerobic digestion

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Journal of Environmental Sciences 2019年第1期31卷 54-63页

作者： ariel E.Turcios Jutta Papenbrock Institute of Botany Leibniz University Hannover

The biofiltering capacity, distribution patterns and degradation of the antimicrobial sulfamethazine(SMT) by halophyte Chenopodium quinoa under hydroponic conditions and its further biodegradation through anaerobic digestion were evaluated. C. quinoa was cultivated for a complete life cycle under different concentrations of SMT(0, 2 and 5 mg/l) and sodium chloride(0 and 15 g/l). C. quinoa is able to uptake and partially degrade SMT. The higher the SMT concentration in the culture medium, the higher the SMT content in the plant tissue. SMT has different distribution patterns within the plant organs, and no SMT is found in the *** crop residues containing SMT have a great potential to produce methane through anaerobic digestion and, in addition, SMT is further biodegraded. The highest specific methane yields are obtained using crop residues of the plants cultivated in the presence of salt and SMT with concentrations between 0 and 2 mg/l.

关键词： Anaerobic digestion Chenopodium quinoa FISH analysis Phytoremediation Sulfamethazine biodegradation

Glutamine is highly effective in preventing in vivo cobalt-induced oxidative stress in rat liver

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World Journal of Gastroenterology 2005年第23期11卷 3533-3538页

作者： Soledad Gonzales ariel H.Polizio María A.Erario María l.Tomaro Departamento de Química Biológica

AIM: To evaluate the in vivo effect of glutamine on cobaltgenerated oxidative stress and (HO-1) induction in rat ***: Fasted female Wistar rats received a single injection of cobalt chloride (375 μmol/kg body weight) and then were killed at different times. lipid peroxidation and soluble and enzymatic antioxidant defense system (reduced glutathione (GSH), catalase (CAT), glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD)) were measured in liver homogenates. Ferritin and ferritin iron contents as well as heme oxygenase-1 (HO-1) activity and expression were also determined. The antioxidant properties of glutamine (Gin) were also evaluated. RESUlTS: Cobalt chloride increased lipid peroxidation (50% over control values) 1 h after treatment. GSH reached a minimum at 3 h (40%) increasing thereafter. Twelve hours after CoCl2 injection, the antioxidant enzymes CAT, GSH-Px and SOD also diminished by about 30%. Heme oxygenase-1 induction was observed 6 h after treatment reaching a maximum value of 14-fold over the controls, 12 h after cobalt treatment. A 1.7-fold increase in ferritin and ferritin-bound iron 24 h after treatment were also obtained. Administration of glutamine (300 mg/kg body weight) by gavage 24 h before CoCl2 treatment entirely prevented the increase in thiobarbituric acid reactive substances (TBARS) content, the decrease in GSH levels, and partially reverted heme oxygenase-1 induction. CONClUSION: These results suggested that a natural product such as glutamine prevents glutathione depletion and consequently heme oxygenase induction.

关键词： Oxidative stress Heme oxygenase Glutathione Glutamine Iron liver

Supplying the trip to antibody production-nutrients,signaling,and the programming of cellular metabolism in the mature B lineage

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Cellular & Molecular Immunology 2022年第3期19卷 352-369页

作者： Mark R.Boothby Shawna K.Brookens ariel l.Raybuck Sung Hoon Cho Department of Pathology Microbiology&ImmunologyMolecular Pathogenesis DivisionVanderbilt University Medical CenterNashvilleTN37232USA Department of Medicine Rheumatology&Immunology DivisionVanderbilt University Medical CenterNashvilleTN37232USA Cancer Biology Program Vanderbilt UniversityNashvilleTN37232USA Vanderbilt Institute of Infection Inflammationand ImmunologyNashvilleTN37232USA

The COVID pandemic has refreshed and expanded recognition of the vital role that sustained antibody(Ab)secretion plays in our immune defenses against microbes and of the importance of vaccines that elicit Ab protection against *** this backdrop,it is especially timely to review aspects of the molecular programming that govern how the cells that secrete Abs arise,persist,and meet the challenge of secreting vast amounts of these *** plasmablasts and plasma cells(PCs)are the primary sources of secreted Abs,the process leading to the existence of these cell types starts with naive B lymphocytes that proliferate and differentiate toward several potential *** each step,cells reside in specific microenvironments in which they not only receive signals from cytokines and other cell surface receptors but also draw on the interstitium for *** in turn influence flux through intermediary metabolism and sensor enzymes that regulate gene transcription,translation,and *** review will focus on nutrient supply and how sensor mechanisms influence distinct cellular stages that lead to PCs and their adaptations as factories dedicated to Ab *** findings of this group and others,sometimes exhibiting differences,will be summarized with regard to the journey to a distinctive metabolic program in PCs.

关键词： B lymphocyte Plasma cell Intermediary metabolism Glucose Glutamine Fatty acid Signal transduction