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Статті в журналах з теми "O-redox":
1
Molina Portela, Maria P., Silvia H. Fernandez Villamil, Luis J. Perissinotti, and Andres O. M. Stoppani. "Redox cycling of o-naphthoquinones in yrypanosomatids." Biochemical Pharmacology 52, no. 12 (December 1996): 1875–82. http://dx.doi.org/10.1016/s0006-2952(96)00601-6.
2
Spasojević, Ivan, Stefan I. Liochev, and Irwin Fridovich. "Lucigenin: Redox Potential in Aqueous Media and Redox Cycling with O−2 Production1." Archives of Biochemistry and Biophysics 373, no. 2 (January 2000): 447–50. http://dx.doi.org/10.1006/abbi.1999.1579.
3
Huang, Tzu-Yang, and Bryan D. McCloskey. "Separating O-Redox and Mn-Redox Voltage Hysteresis in a Cation-Disordered Rock-Salt Cathode." ECS Meeting Abstracts MA2023-01, no. 2 (August 28, 2023): 491. http://dx.doi.org/10.1149/ma2023-012491mtgabs.
Анотація:
Pronounced voltage hysteresis is commonly associated with oxygen redox in Li-excess cathode materials. However, they often involve coexisting transition-metal and oxygen redox, whose contributions to hysteresis are challenging to distinguish. In this work, a two-step aqueous redox titration was developed with the aid of mass spectrometry (MS) gas analyzer to quantify two coexisting solid-phase analytes, namely oxidized oxygen and Mn3+/4+ in a representative Li-excess cation-disordered rock salt (DRX) material. Two MS-countable gas molecules evolve from two separate titrant-analyte reactions, which allows decoupling Mn and O redox capacities. As incremental redox capacities are quantitatively decoupled, each redox voltage hysteresis can be further evaluated through deconvoluted energy efficiency and overvoltages. Overall, a low DRX operating efficiency arises not only from quasi-static voltage hysteresis of O redox, but also from asymmetric Mn-redox overvoltages. The results reveal that O redox is not always the only culprit for a low energy efficiency and slow kinetics, but instead discharging overvoltage, associated with transition-metal redox, can significantly drag down overall operating efficiency. This work further shows the potential of designing new analytical workflow to experimentally diagnose various DRX materials and inform improvement direction.
4
Eisenstecken, Daniela, Barbara Enk, Holger Kopacka, Klaus Wurst, Thomas Müller, Florian Pevny, Rainer F. Winter, and Benno Bildstein. "Redox-Responsive Rhodocenium [O,O]-, [N,O]-, [N,N]-, and [N,C,N]-Metalloligands." European Journal of Inorganic Chemistry 2011, no. 19 (May 25, 2011): 2958–66. http://dx.doi.org/10.1002/ejic.201100226.
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Palys, Barbara, Agnieszka Bokun, and Jerzy Rogalski. "Poly-o-phenylenediamine as redox mediator for laccase." Electrochimica Acta 52, no. 24 (August 2007): 7075–82. http://dx.doi.org/10.1016/j.electacta.2007.05.029.
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Shen, Xiaoxiao, Shuaishuai Zhang, Yuping Wu, and Yuhui Chen. "Promoting Li–O 2 Batteries With Redox Mediators." ChemSusChem 12, no. 1 (January 9, 2019): 104–14. http://dx.doi.org/10.1002/cssc.201802007.
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Jadhav, Rohit G., and Shelley D. Minteer. "Conjugated Bipolar Redox-Active Electrolyte for Symmetric Redox Flow Battery." ECS Meeting Abstracts MA2022-02, no. 46 (October 9, 2022): 1705. http://dx.doi.org/10.1149/ma2022-02461705mtgabs.
Анотація:
Organic non-aqueous redox-flow batteries (O-NRFBs) are gaining traction as viable alternatives for long-term, low-cost stationary energy storage with a wide potential window.[1] The symmetric O-NRFBs with single bipolar electrochemically active molecule as both anolyte and catholyte (i.e. bipolar redoxmer) helps to mitigate permanent cross-contamination and capacity fading.[2] However, symmetric O-NRFBs with bipolar molecules are hampered by the scarcity of redox active molecules capable of serving as a stable bipolar redoxmer with high cell potential and unpredictable side reactions.[3] This study proposes the π-conjugation of electrochemical active electron donors and electron acceptor which leads to the possible control over direct electronic perturbation between acceptor-donor to form new type of redox molecules. This study aims designing of benzothiadiazole based conjugated bipolar redox-active molecule with high potential window and high stability. [1]. M. Li, S. A. Odom, A. R. Pancoast, L. A. Robertson, T. P. Vaid, G. Agarwal, H. A. Doan, Y. Wang, T. M. Suduwella, S. R. Bheemireddy, R. H. Ewoldt, R. S. Assary, L. Zhang, M. S. Sigman, and S. D. Minteer, “Experimental protocols for studying organic non-aqueous redox flow batteries,” ACS Energy Lett., 2021, 6, 11, 3932–3943. [2]. M. Li, J. Case, and S. D. Minteer, “Bipolar redox-active molecules in non-aqueous organic redox flow batteries: status and challenges,” ChemElectroChem, 2021, 8, 1215–123. [3] M. Li, G. Agarwal, I. A. Shkrob, R. T. VanderLinden, J. Case, M. Prater, Z. Rhodes, R. S. Assary and S. D. Minteer, “Critical role of structural order in bipolar redox-active molecules for organic redox flow batteries,” J. Mater. Chem. A, 2021, 9, 23563-23573.
8
Andrade, João Carlos de. "Química analítica básica." Revista Chemkeys 3 (August 5, 2021): e021002. http://dx.doi.org/10.20396/chemkeys.v3i00.15815.
Анотація:
As titulações redox são procedimentos analíticos relativamente simples, rápidos e de baixo custo, empregados na determinação de espécies redox ativas. Analogamente aos casos envolvendo sistemas ácido-base, onde o curso de uma titulação pode ser seguido por meio de uma curva pH versus o volume do titulante (V), uma titulação envolvendo uma reação redox pode ser monitorada observando-se a curva Potencial (ε) versus o volume do titulante (V), desde que o sistema redox a ser empregado preencha todos os requisitos necessários para que uma reação química possa ser considerada como adequada para uso em uma titulação. Uma vez atendidos esses requisitos e a partir das suas semirreações, é possível descrever uma titulação redox com equações matemáticas e construir sua curva de titulação teórica, tal qual foi feito anteriormente para sistemas não-redox. Entretanto, apesar da sua importância, relativamente, têm recebido menos atenção que a volumetria envolvendo reações não-redox. Não há uma razão específica que possa ser atribuída à essa observação, mas se pode especular se isso não se deve fato de que o uso de procedimentos analíticos envolvendo processos de óxido-redução exigem conhecimentos teóricos e cuidados experimentais adicionais. Esse artigo busca dar uma visão geral ao leitor sobre a volumetria de óxido-redução e suas curvas de titulação, chamando a atenção para a necessidade de maior cuidado ao trabalhar com esta técnica.
9
Bruce, Peter G. "(Invited) O-Redox Cathodes the Role of Trapped O2." ECS Meeting Abstracts MA2021-02, no. 2 (October 19, 2021): 187. http://dx.doi.org/10.1149/ma2021-022187mtgabs.
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Santos, André Bezerra dos. "Aplicação conjunta de tratamento anaeróbio termofílico por lodo granular e de mediadores redox na remoção de cor de águas residuárias têxteis." Engenharia Sanitaria e Ambiental 10, no. 3 (September 2005): 253–59. http://dx.doi.org/10.1590/s1413-41522005000300010.
Анотація:
Investigou-se o efeito de diferentes mediadores redox na remoção de cor de corantes azo pelo uso de lodo granular anaeróbio sob condições mesofílicas (30ºC) e termofílicas (55ºC). Adicionalmente, estudou-se em ambas temperaturas, o efeito de diferentes doadores de elétrons nos processos de descoloração. Comprovou-se em tais processos um impacto marcante da adição de concentrações catalíticas de mediadores redox, aumentando a cinética da reação em até 1 ordem de magnitude. Comparado com tratamento mesofílico, remoções de cor sob condições termofílicas foram extremamente aceleradas, além de o impacto dos mediadores redox ser consideravelmente diminuído à 55ºC. Por exemplo, em experimento de fluxo contínuo, eficiências de remoção em torno de 95% e 56% foram obtidas à 55ºC e 30ºC, respectivamente, na ausência de qualquer mediador redox. Hidrogênio se mostrou extremamente efetivo como doador de elétrons para o processo de descoloração redutiva de corantes azo quando comparado com glicose, formiato e acetato. Os resultados obtidos nesta investigação trazem boas perspectivas para o uso conjunto de reatores anaeróbios sob condições termofílicas e de mediadores redox no pré-tratamento das águas residuárias de indústrias têxteis.
Дисертації з теми "O-redox":
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Miché, Colette. "Equilibres redox du fer dans le système Na₂O - Al₂O₃ - SiO₂." Paris 7, 1985. http://www.theses.fr/1985PA07F083.
Анотація:
Etude chimique et structurale par absorption optique et RPE du couple Fe²⁺/Fe³⁺ dans les verres binaires Na₂O-SiO₂ et ternaires Na₂O - Al₂O₃ - SiO₂: évolution du rapport Fe²⁺/Fe total en fonction de divers paramètres (composition, température), étude structurale de l'évolution des deux états de valence du fer
2
Teixeira, Amanda Escobar. "Dieta de cafeteria desde a lactac?o promove s?ndrome metab?lica e alterac?o na ac?o da risperidona sobre a ansiedade, locomoc?o, mem?ria e interac?o social de ratos Wistar." UFVJM, 2018. http://acervo.ufvjm.edu.br/jspui/handle/1/1763.
Анотація:
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Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
O objetivo deste trabalho foi avaliar os efeitos da dieta de cafeteria desde a lacta??o nos par?metros nutricionais e na a??o da risperidona nos comportamentos de ansiedade, locomo??o, mem?ria e intera??o social. Foram utilizadas 14 ninhadas de ratos da linhagem Wistar (Rattus novergicus) alojados em gaiolas individuais, sob condi??es padr?o. Os ratos machos de cada ninhada formaram, da lacta??o at? a fase adulta, os grupos: Controle (CTRL) ? receberam ra??o padr?o e ?gua ad libitum (n = 42); Cafeteria (CAF) ? receberam dieta de cafeteria e ?gua ad libitum (n = 42). Entre o 114? e o 119? dia de vida, os animais foram subdividos (n = 21) para receberem o tratamento com salina (CTRL-S e CAF-S) ou risperidona (CTRL-R e CAF-R). Nesse per?odo foram realizados os testes comportamentais do labirinto em cruz elevado, campo aberto, teste de reconhecimento de objetos e intera??o social. No 119? os animais foram colocados em jejum, para que, no 120? dia fossem anestesiados e eutanasiados por exsanguina??o. Foram avaliados: consumo de ra??o, ingest?o cal?rica, peso corporal, ganho de peso, coeficiente de efici?ncia alimentar (CEA), comprimento naso-anal e ?ndice de massa corporal (IMC); peso dos ?rg?os e do tecido adiposo abdominal; teores de colesterol total e fra??es, triacilglicerol e glicemia do soro; teor de lip?dios, colesterol total e triacilglicerol do f?gado e das fezes; estado redox do f?gado e de diferentes por??es do enc?falo (c?rtex pr?-frontal e hipocampo). Foi utilizada an?lide de vari?ncia (ANOVA) seguida de Newman Keuls quando necess?rio (P<0,05). O grupo CAF demonstrou menor ingest?o alimentar e maior ingest?o cal?rica, devido ? densidade energ?tica da dieta. O maior consumo cal?rico se configurou em maior ganho de peso, CEA, IMC e ac?mulo de tecido adiposo abdominal. O grupo CAF tamb?m obteve eleva??o dos n?veis de triacilglicerol plasm?ticoa, al?m de lip?dios e triacilglicerol hep?tico, que foram classificados em esteatose hep?tica. Ao mesmo tempo, houve uma rela??o ruim entre as fra??es do colesterol plasm?tico (HDL-c, LDL-c e VLDL-c), com aumento do risco de doen?as aterog?nicas. Portanto, a dieta de cafeteria foi capaz de reproduzir um modelo de obesidade humana e de s?ndrome metab?lica. Os animais do grupo de cafeteria apresentaram caracter?sticas de estresse oxidativo no hipocampo, o que pode comprometer a fun??o dessa estrutura e promover altera??es comportamentais. O grupo CAF - S obteve efeito ansiol?tico devido ao maior n?mero de entradas e tempo gasto no centro do campo aberto, al?m de maior locomo??o atrav?s do maior n?mero de quadrantes percorridos. CAF - S ainda demonstrou preju?zos na mem?ria avaliados atrav?s do teste de reconhecimento de objetos e diminui??o da intera??o social. Tais efeitos podem estar associados a altera??es no sistema serotonin?rgico desses animais. CAF - R demonstrou efeito ansiog?nico e diminui??o na locomo??o no campo aberto. No teste de reconhecimento de objetos, houve diminui??o na intera??o com os objetos, sem, no entanto, melhorar o ?ndice de discrimina??o em rela??o a CAF - S. No teste de intera??o social, CAF - R obteve maior sociabilidade. Os resultados da administra??o da risperidona indicam que esta droga possui um efeito diferente quando aplicada em animais que foram tratados com dieta de cafeteria desde a lacta??o.
Disserta??o (Mestrado) ? Programa de P?s-gradua??o em Ci?ncias Farmac?uticas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018.
The objective of this work was to evaluate the effects of the cafeteria diet from lactation on the nutritional parameters and the action of risperidone on the behaviors of anxiety, locomotion, memory and social interaction. Fourteen litters of Wistar rats (Rattus novergicus) housed in individual cages were used under standard conditions. The male rats from each litter formed from the lactation to the adult phase, the groups: Control (CTRL) - received standard chow and water ad libitum (n = 42); Cafeteria (CAF) - received cafeteria diet and water ad libitum (n = 42). Between days 114 and 119, animals were subdivided (n = 21) to receive treatment with saline (CTRL-S, CAF-S) or risperidone (CTRL-R and CAF-R). During this period, the behavioral tests of the plus maze size, open field, test of object recognition and social interaction were performed. At 119? the animals were fasted, so that on the 120? day they were anesthetized and euthanized by exsanguination. The following were evaluated: feed intake, caloric intake, body weight, weight gain, food efficiency coefficient (FEC), naso-anal length and body mass index (BMI); weight of organs and abdominal adipose tissue; levels of total cholesterol and fractions, triacylglycerol and serum glycemia; lipid content, total cholesterol, and triacylglycerol of liver and faeces; redox status of the liver and different portions of the encephalon (prefrontal cortex and hippocampus). Variance analysis (ANOVA) was used followed by Newman Keuls when necessary (p<0,05). The CAF group demonstrated lower dietary intake and higher caloric intake, due to the energy density of the diet. The highest caloric intake was in greater weight gain, FEC, BMI and abdominal adipose tissue accumulation. The CAF group also achieved elevations in plasma triglyceride levels, besides lipids and hepatic triacylglycerol, which were classified as hepatic steatosis. At the same time, there was a poor relationship between fractions of plasma cholesterol (HDL-c, LDL-c and VLDL-c), with increased risk of atherogenic diseases. Therefore, the cafeteria diet was able to reproduce a model of human obesity and metabolic syndrome. The animals in the cafeteria group presented oxidative stress characteristics in the hippocampus, which may compromise the function of this structure and promote behavioral changes. The CAF - S group had an anxiolytic effect due to the greater number of entrances and time spent in the center of the open field, besides greater locomotion through the greater number of quadrants traveled. CAF - S also demonstrated memory impairments assessed through the object recognition test and decreased social interaction. Such effects may be associated with changes in the serotonergic system of these animals. CAF - R demonstrated an anxiogenic effect and decreased locomotion in the open field. In the object recognition test, there was a decrease in the interaction with the objects, without, however, improving the discrimination index in relation to CAF - S. In the social interaction test, CAF - R obtained greater sociability. The results of the administration of risperidone indicate that this drug has a different effect when applied in animals that have been treated with cafeteria diet since lactation.
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LIMA, Erica Souto Abreu. "Din?mica do b?rio em solos que receberam baritina." Universidade Federal Rural do Rio de Janeiro, 2011. https://tede.ufrrj.br/jspui/handle/jspui/1135.
Анотація:
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior-CAPES
LIMA, Erica Souto Abreu. Dynamic of barium in soils treated with barite. 2011. 44p. Dissertation (Master Science in Agronomy, Soil Science) Instituto de Agronomia, Departamento de Solos, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2011. Barite is the natural mineral form of barium sulfate (BaSO4), which is used in drilling fluids for oil wells exploration. Although barium sulfate is poorly soluble, and therefore, not very bioavailable to plants and with low mobility, it is not know the magnitude of changes in its dynamics under reducing soil conditions. Thus, the main objective of the study was to evaluate if under extreme reduction conditions the solubilization and release of barium in the soil would occur, increasing risk of contamination to plants and groundwater. Two experiments were conducted in parallel, one in leaching columns and the other in pots, where rice was cultivated as a test plant. In both trials soil samples from an Udox soil were used. The installation of experiments followed a completely randomized design in factorial scheme (4 x 2) with four replications, i.e., composed of control and three levels of barium (100, 300, and 3000 mg kg-1), two moisture levels (at 70% of field capacity and saturated with the maintenance of a 5 cm layer of water), totaling 32 experimental units. The redox potential (Eh), and pH values to reach the Eh of -200 mV were monitored. After reaching these values a rainfall of 200 mm day-1 was simulated in the columns, and volumes of 200 mL were collected. The extract was divided into volumes of 200 mL, corresponding to 1/8 of the soil pore volume, and they were analyzed for levels of barium and other toxic metals. The rice (Oryza sativa L.) plants in the vases remained throughout the vegetative cycle up to about 4 months, when they were harvested and analyzed. The geochemical fractionation was also performed for the elements barium, manganese and iron, by the BCR method. The results showed that the addition of doses of barite in soil, and the condition of extreme reduction led to the increase of barium, iron and manganese in the highest labile fractions. Thereby promoting higher levels of barium in the leachate extract. Under these conditions, the plants showed growth and development reduction. However, the barium may not be the main cause of this reduction, which may be linked to iron toxicity and lower absorption of zinc, phosphorus and calcium.
A baritina ? a forma mineral natural de sulfato de b?rio (BaSO4), que ? amplamente utilizada nos flu?dos de po?os de prospec??o de petr?leo. Apesar do sulfato de b?rio ser pouco sol?vel, e consequentemente, pouco biodispon?vel para as plantas e de baixa mobilidade, n?o se conhece a magnitude das altera??es na sua din?mica em condi??es redutoras do solo. Diante disso, o objetivo principal do estudo foi avaliar se em condi??es de extrema redu??o ocorre o aumento da solubiliza??o e como conseq??ncia libera??o do b?rio no solo, potencializando o risco de contamina??o para as plantas e ?guas subterr?neas. Foram realizados dois experimentos em paralelo, sendo um em colunas de lixivia??o e o outro em vasos, onde foi cultivado arroz como planta teste. Em ambos os ensaios foram utilizadas amostras de terra coletadas de Latossolo Vermelho Amarelo. A instala??o dos experimentos seguiu o delineamento experimental inteiramente casualizado, em esquema fatorial (4 x 2) com 4 repeti??es, ou seja, composto por testemunha e tr?s doses de b?rio (100, 300 e 3000 mg kg-1), dois teores de umidade (70% CC e saturado com presen?a de l?mina de 5 cm), totalizando 32 unidades experimentais. Foram monitorados o potencial redox (Eh) e o pH, at? atingirem valores de Eh de -200 mV. Ap?s atingirem esses valores foi simulada uma precipita??o pluviom?trica de 200 mm dia-1 nas colunas, onde foram coletados volumes de 200 mL. O extrato foi dividido em volumes de 200 mL, que correspondem a 1/8 do volume de poro da coluna de solo, para em seguida serem analisados quanto aos teores de b?rio e outros metais considerados t?xicos. As plantas de arroz (Oryza sativa L.) foram cultivadas nos potes por todo o ciclo vegetativo (aproximadamente 4 meses) at? serem colhidas e analisadas. Tamb?m foi realizado o fracionamento geoqu?mico para os elementos b?rio, mangan?s e ferro pelo m?todo BCR. Os resultados obtidos evidenciaram que a adi??o das doses de baritina no solo e a condi??o de extrema redu??o, propiciaram o aumento de b?rio, ferro e mangan?s nas fra??es de maior labilidade. Promovendo, assim, maiores teores de b?rio no extrato lixiviado. Nessas condi??es, as plantas apresentaram redu??o no seu crescimento e desenvolvimento. Por?m o b?rio pode n?o ser o principal causador dessa redu??o, podendo esta estar ligada a toxicidade do ferro e a uma menor absor??o de zinco, f?sforo e c?lcio.
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Majzlík, Petr. "Radikálové reakce rozpadu N-H, O-H a O-O vazeb účinkem homogenních a heterogenních redox činidel." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233309.
Анотація:
The Ph.D. thesis was focused on EPR study of redox reactions of selected types of phenols, secondary amines and diperoxy coumpounds. Within the study some redox agents were employed in nonpolar, in some special cases also in polar solvents. EPR spectra of generated radical products were interpreted using spectral simulation. Study of radical reactions under participation of phenols was preferentially concentrated on the behavior of para methyl substituted phenols, where the instability of this substituent in relation to the applied redox agents was evaluated. The tendency towards the abstraction of hydrogen from methyl group, representing the paralell mechanism to the hydrogen abstaction from phenolic OH group was proved. The generated benzyl radicals were undirectly detected in the form of adducts with aromatic nitroso compounds. These adducts undergo the consecutive transformations, leading to the formation of new types of phenoxy radicals. The study of the decomposition of NH bonds was performed with substituted N,N´-paraphenylenediamines, 1-anilino-1-phenylpentane-3-ones and amino substituted 1,3-dimethyluracils. By the oxidation with 3-chloroperbenzoic acid the corresponding nitroxyl radicals were prepared. In the case of 1-anilino-1-phenylpentane-3-ones the aminyl radicals were prepared by the oxidation with PbO2, which existence was evidenced by spin trapping method with nitrosobenzene. In the framework of the investigation of the decomposition of -O-O- bonds the oxygen centred radicals, generated from peroxidic compounds of Luperox type using selected redox agents were detected by spin trapping method. The analysis of EPR spectra documented that primary alkoxyl radicals undergo the consecutive fragmentation, which leads in the presence of oxygen to the formation of secondary alkoxyl radicals. The generation of oxygen centred radicals during the decomposition was indirectly proved in the presence of model phenolic compounds, where due to the abstraction of hydrogen from phenolic OH group the phenoxyl radicals are formed.
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CARVALHO, Michel Miranda de. "Efeito da aplica??o de res?duo de perfura??o de po?o de petr?leo no desenvolvimento de cevada (Hordeum vulgare L.)." Universidade Federal Rural do Rio de Janeiro, 2013. https://tede.ufrrj.br/jspui/handle/jspui/2054.
Анотація:
CNPqFaced with the need to implement a sustainable development, and seeking solutions for protecting the environment, the management of residues has undergone marked changes. Companies are increasingly involved in the optimization of residues produced in their production processes. The oil industry participates in this search by funding research and development of environmentally sound technologies. This study aimed to evaluate the development of barley plants (Hordeum vulgare L.) in soils incubated with drill waste from oil well treated by washing to eliminate the influence of sodium. Two residues generated during drilling of the well 7-SMC-50D-AL were selected to be used in two assays: one in pots planted with barley, and one with leaching columns. For the pots testing the residues were washed with water, using a ratio of 1:5, aiming to reduce the effects of the sodium. Thus, the washing treatment defined two other conditions: residue washed and unwashed. The quantity of residue added to the soil was defined in order to obtain the barium concentrations of 300 mg kg-1, 600 mg kg-1 and 1200 mg kg-1. The soil moisture was maintained at 70% of field capacity. The experimental units were kept incubated for 30 days, and covered with plastic bags to prevent water loss by evaporation. The plants sowing was made using 10 seeds in each pot, and after the thinning with 30 days there was left 4 plants per pot. After the harvesting, the plants were separated into root, shoot and grain; and it was evaluated the absorption of the elements barium, iron, manganese, calcium, sodium, zinc and potassium. The results showed that the residues of the centrifugal and the dryer promoted an increased production of plant dry matter, especially in the treatment with the residue washing. For the test columns, there was no washing of the residues. The same doses were tested with two conditions of humidity (70% of field capacity and reduced condition, simulating the presence of a ground water table). During the incubation the pH and the redox potential (Eh) were monitored until, in the reduction condition, values close to ? 200 mV were obtained, and then, waiting for 30 days to ensure the occurrence of the reduction reactions. After that, the leaching test proceeded, simulating rainfall and collecting the extract leachate to evaluate the barium content. The geochemical fractionation of barium was done using a modification of the BCR method. The fractionation results showed that the reduction condition provided greater availability of barium, increasing the bioavailable fraction for both cuttings. In the leaching test, there was an increase in barium level in the reduction condition, due to the reduction of sulfate to sulfide.
Diante da necessidade de implementar o desenvolvimento sustent?vel, buscando solu??es para a prote??o do meio ambiente, a gest?o de res?duos tem passado por mudan?as marcantes. As empresas est?o cada vez mais envolvidas na otimiza??o de res?duos produzidos em seus processos produtivos. A ind?stria petrol?fera participa dessa busca por solu??es atrav?s do financiamento de pesquisas e do desenvolvimento de tecnologias ambientalmente seguras. Este trabalho teve como objetivo avaliar o desenvolvimento de plantas de cevada (Hordeum vulgare L.) em solos incubados com res?duos de perfura??o de po?o de petr?leo tratados com lavagem para eliminar a influ?ncia do s?dio. Foram selecionados dois res?duos gerados durante a perfura??o do Po?o7-SMC-50D-AL para serem utilizados em dois ensaios: um com vasos cultivados com cevada e outro com colunas de lixivia??o. Para o ensaio com vasos foi feita a lavagem dos res?duos em ?gua, na propor??o 1:5, visando diminuir os efeitos do s?dio. Dessa forma, o tratamento de lavagem definiu duas condi??es: res?duo lavado e res?duo n?o lavado. A quantidade de res?duo adicionada ao solo foi definida de modo a atingir as concentra??es de b?rio de 300 mg kg-1, 600 mg kg-1 e 1200 mg kg-1. A umidade do solo foi mantida a 70% da capacidade de campo. As unidades experimentais permaneceram incubadas por 30 dias, cobertas com sacos pl?sticos para evitar a perda de ?gua por evapora??o. Em seguida foi feita a semeadura, utilizando 10 sementes em cada vaso, e com o desbaste ap?s 30 dias restaram apenas 4 plantas por vaso. Ap?s a coleta as plantas foram separadas em raiz, parte a?rea e gr?os e foi avaliada a absor??o dos elementos b?rio, ferro, mangan?s, c?lcio, s?dio, zinco e pot?ssio. Os resultados obtidos demonstraram que os res?duos do secador e da centr?fuga promoveram aumento da produ??o de mat?ria seca pelas plantas, principalmente no tratamento lavado. Para o ensaio com colunas n?o houve lavagem dos res?duos. Foram testadas as mesmas doses em duas condi??es de umidade (70% da capacidade de campo e ambiente reduzido com presen?a de l?mina de ?gua). Durante a incuba??o foi feito o monitoramento de pH e potencial redox (Eh) at? que, na condi??o de redu??o, fossem atingidos valores pr?ximos de -200 mV, aguardando por 30 dias para assegurar a ocorr?ncia das rea??es de redu??o. Em seguida foi feito o ensaio de lixivia??o, simulando uma precipita??o e coletando o extrato lixiviado para avalia??o quanto ao teor de b?rio. Foi feito o fracionamento geoqu?mico do elemento b?rio utilizando-se o m?todo BCR com algumas modifica??es. Os resultados mostraram que no fracionamento as fra??es biodispon?vel para ambos os res?duos na condi??o de redu??o proporcionou uma maior disponibilidade do b?rio. Na lixivia??o houve um aumento dos teores de b?rio na condi??o de redu??o proporcionado pela redu??o de sulfato a sulfeto.
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Magalh?es, Marcio Osvaldo Lima. "Din?mica do b?rio em solos contaminados por res?duos oriundos da perfura??o de po?os de petr?leo." Universidade Federal Rural do Rio de Janeiro, 2011. https://tede.ufrrj.br/jspui/handle/jspui/1222.
Анотація:
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
Despite the known problems caused by the by-products generated from the exploration of oil, this activity will be a part of our reality for the next 50 years. The oil drilling and exploration industry creates a substantial amount of waste that, if not adequately disposed of, could cause environmental problems. One of the main contaminates found in the waste related to oil drilling is the element barium. The purpose of this study was to evaluate the contamination of soil containing barium, its impact on the growth of rice plants (Orysa sativa) and potential risk of contaminating groundwater. This paper was divided into four chapters. The goal of the first chapter was to evaluate the spatial variability of barium levels found in former oil well drilling waste disposal sites. For this study, soil was collected from georeferenced points, analyzed in terms of its pseudo total levels, and prepared for the geochemical fractionation of barium, classifying the material in accordance with resolution 420 of CONAMA [Brazilian National Counsel on the Environment] (2009). In the second chapter, the effect of redox potential in soil on the mobility and absorption of barium by rice, having barium sulfate P.A. as the element?s source, was assessed. The effect was evaluated by performing rice culture pot and column leaching tests. The aim of the third chapter was the characterization and traceability of heavy metals in waste generated during the recovery of oil well drilling fluids. The waste was collected during the drilling of well 7-MGP-98D-BA, where the material was separated by composite sample, based on depth and equipment. In the fourth chapter, the effects of redox potential in soil interaction and heavy metals coming from the waste generated from onshore oil well drilling were analyzed. This chapter was similar to chapter two, with the main difference being the waste generated from well 7-MGP-98D-BA, which supplied the source of barium. The waste materials selected were those that displayed the lowest levels of arsenic, cadmium, barium, lead, and sodium. The obtained results showed that waste generated from oil well drilling contains high levels of barium, and that when disposed of in soil can significantly contribute to site contamination, having used the guiding values of CONAMA (2009) as a reference. As such, the barium present in this area was in the form of low solubility, as evidenced by the geochemical fractionation of the element. It was also observed that the conditions of low values of redox potential (-200 mV) promoted an increase of barium in fractions of greater mobility, causing major losses of the element by leaching, and increased absorption by plants. Among the studied waste materials, the waste from the dehydrator and the centrifuge 1 presented high levels of sodium as its greatest limitation, which affected the development of plants.
Apesar da verifica??o de problemas ocasionados pelo uso de produtos gerados a partir da explora??o do petr?leo, essa atividade ? uma realidade nos pr?ximos 50 anos. A industria de perfura??o e explora??o de petr?leo ? uma atividade que gera muitos residuos que, caso dispostos de forma inadequada, podem ocasionar problemas ambientais. Um dos principais contaminantes relacionados aos res?duos de perfura??o de po?os de petr?leo ? o elemento b?rio. A proposta desse estudo foi de avaliar a contamina??o dos solos com b?rio e seu impacto no desenvolvimento de plantas de arroz (Orysa sativa) e o risco de contamina??o do len?ol fre?tico. Para isso o trabalho foi dividido em quatro cap?tulos. O primeiro cap?tulo teve como objetivo avaliar a variabilidade espacial dos teores de b?rio em antiga ?rea de disposi??o de res?duo de perfura??o de po?os de petr?leo. Nesse estudo foram coletados solos em pontos georreferenciados e analisados quanto aos teores pseudototais e feito o fracionamento geoqu?mico do b?rio, classificando o material de acordo com a resolu??o 420 do Conama (2009). No segunto cap?tulo foi avaliado o efeito do potencial redox do solo na mobilidade e absor??o de b?rio por arroz, tendo como fonte do elelmento o sulfato de b?rio P.A. Esse efeito foi avaliado atrav?s de ensaios em vasos com cultivo de arroz e em colunas de lixivia??o. O terceiro cap?tulo teve como objetivo a caracteriza??o e rastreabilidade de metais pesados em res?duos gerados na recupera??o do fluido de perfura??o de po?os de petr?leo. O res?duo foi coletado durante a perfura??o do po?o 7-MGP-98D-BA, onde os materiais foram separados em amostras compostas em fun??o da profundidade e do equipamento. No quarto cap?tulo foi analisado o efeito do potencial redox na intera??o solo e metais pesados provenientes de res?duos oriundos da perfura??o de po?os de petr?leo ?onshore?. Esse cap?tulo foi semelhante ao cap?tulo 2, diferindo principalmente na fonte de b?rio que foi o res?duo gerado no po?o 7-MGP-98D-BA. Os res?duos selecionados foram os que apresentaram como os mais restrit?vos com rela??o aos teores de ars?nio, c?dmio, b?rio, chumbo e s?dio. Os resultados obtidos evidenciaram que os res?duos oriundos da perfura??o de po?os de petr?leo possuem altos teores de b?rio, que quando dispostos nos solos podem contribuir significativamente para a contamina??o das ?reas, tendo como refer?ncia os valores orientadores do Conama (2009). Entretanto, o b?rio presente nessa ?rea estava sob forma de baixa solubilidade, evidenciada pelo fracionamento geoqu?mico do elemento. Tamb?m foi observado que a condi??o de baixos valores de potencial redox (-200 mV) promoveu o aumento do b?rio nas fra??es de maior mobilidade, ocasionando maiores perdas do elemento por lixivia??o e maior absor??o pelas plantas. Dentre os res?duos estudados, os res?duos do secador e da centr?fuga 1 apresentaram como maior limita??o os altos teores de s?dio, o que afetou o desenvolvimento das plantas.
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Harrison, Tyler S. (Tyler Steven). "Studies on a catalytic cadogan cyclization by PI̳I̳I̳/PV̳=O redox cycling." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115807.
Анотація:
Thesis: S.M., Massachusetts Institute of Technology, Department of Chemistry, 2018.Cataloged from PDF version of thesis. The double underlined I̳I̳I̳ and V̳ in title on title page appear as superscript capital letters.
Includes bibliographical references.
Organophosphorus reagents offer potential for developing catalytic protocols by inclusion of a reductant such as hydrosilanes to (re)generate the chemically active phosphine in situ. In our research, we have successfully adapted this concept to the Cadogan reductive cyclization by using a strained 4-membered phosphetane precatalyst, which proved to be more competent than acyclic and 5-membered analogs for P(III)/P(V)=O redox cycling. A variety of substrates were found to successfully undergo catalytic Cadogan indazole cyclization. The mechanism of the cyclization has been expanded. The resting state of phosphorus was determined to be the P" phosphetane, and this phosphetane proved to be 8 times faster than the acyclic n-Bu₃P at driving the reductive cyclization of N-phenyl o-nitrobenzaldimine to 2-phenylindazole. A nitrosoarene, presumed an intermediate in the overall cyclization, was found to undergo cyclization under reaction conditions. In addition, a new unique oxazaphosphetane was observed as an intermediate during the course of cyclization, which may lead to a more complete understanding of other-phosphorus mediated deoxygenations, including nitro reduction. Initial studies in nitro reduction have been undertaken, though further work is necessary to fully develop a phosphorus-mediated catalytic protocol.
by Tyler S. Harrison.
S.M.
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Martins, Lorena Pacheco de Oliveira. "Efeito da terapia por fotobiomodula??o (LED 630 nm) no equil?brio redox e nos aspectos histol?gicos na osteoartrite de joelho induzida por monoiodoacetato em ratos." UFVJM, 2018. http://acervo.ufvjm.edu.br/jspui/handle/1/1761.
Анотація:
Na Ficha Catalogr?fica consta o t?tulo: "Efeito da terapia por fotobiomodula??o (LED630nm) no equil?brio redox e nos aspectos hist?logicos da osteoartrite de joelho induzida por monoiodoacetato de s?dio em ratos".Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-08-30T15:08:00Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) lorena_pacheco_oliveira_martins.pdf: 1327754 bytes, checksum: e69932636c7878e52b2b3d058f72ea94 (MD5)
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A osteoartrite (OA) tem potencial cr?nico-degenerativo e car?ter inflamat?rio. Al?m do papel inflamat?rio, outros fatores, como o desequil?brio redox, parecem contribuir para altera??es na cartilagem articular, a principal estrutura articular afetada. A fotobiomodula??o (FBM) utilizando LED tem sido proposta para o tratamento da OA por atuar sobre os processos degenerativos da cartilagem, favorecer defesas antioxidantes e modular marcadores do estresse oxidativo. Diante disso, o objetivo foi avaliar o efeito da terapia por FBM utilizando LED (630 nm) sobre os aspectos histomorfom?tricos da cartilagem articular e no equil?brio redox na OA de joelho induzida por monoiodoacetato de s?dio em ratos. Foram utilizados 27 ratos Wistar, separados entre os grupos: Controle; osteoartrite (OA) e osteoartrite + LED (OALED). No grupo OALED foi aplicado o LED (630 nm; 300mW; 9 J/cm2; 0,3 W/cm2; 30 s; iniciando 24h ap?s indu??o; 3 vezes/semana; 8 semanas). A eutan?sia dos animais ocorreu 56 dias ap?s a indu??o da OA, o sangue foi coletado para an?lise do dano oxidativo (TBARS), da capacidade antioxidante enzim?tica (atividade da SOD e CAT) e o estado antioxidante total do plasma atrav?s (FRAP). O joelho direito foi utilizado para a morfometria da cartilagem atrav?s da medida da espessura e contagem de condr?citos. O grupo OALED apresentou maior espessura m?dia da cartilagem e m?dia dos condr?citos semelhante ao grupo Controle. Foi observado ainda maior atividade enzim?tica antioxidante (SOD e CAT) e menor concentra??o de TBARS (P<0,05) no grupo OALED comparado ao grupo OA. A terapia por FBM demonstrou ser efetiva sobre o equilibro redox e sobre a preserva??o da cartilagem articular em um modelo de OA induzida.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Reabilita??o e Desempenho Funcional, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018.
Osteoarthritis (OA) has chronic-degenerative potential and inflammatory character. In addition to the inflammatory role, other factors, such as redox imbalance, appear to contribute to changes in the articular cartilage, the main articular structure affected. Photobiomodulation (PBM) using LED has been proposed for the treatment of OA by acting on degenerative cartilage processes, favoring antioxidant defenses and modulating oxidative stress markers. The aim of this study was to evaluate the effect of PBM therapy using LED (630 nm) on the histomorphometric aspects of articular cartilage and redox balance in knee OA induced by sodium monoiodoacetate in rats. Wistar rats were used, separated between the groups: Control; osteoarthritis (OA) and osteoarthritis + LED (OALED). In the OALED group, the LED (630 nm, 300 mW, 9 J / cm2, 0.3 W / cm2, 30 s, starting 24 h after induction, 3 times / week, 8 weeks) was applied. The euthanasia of the animals occurred 56 days after induction of OA, blood was collected for analysis of oxidative damage (TBARS), enzymatic antioxidant capacity (SOD and CAT activity) and the total antioxidant status of plasma through (FRAP). The right knee was used for the morphometry of cartilage by measuring the thickness and counting of chondrocytes. The OALED group had a higher average cartilage thickness and mean chondrocytes similar to the control group. It was also observed higher antioxidant enzymatic activity (SOD and CAT) and lower level of TBARS (P <0.05) in the OALED group compared to the OA group. PBM therapy has been shown to be effective on redox balance and preservation of articular cartilage in an induced OA model.
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Costa, Karine Beatriz. "Efeito do tempo de congelamento da amostra na estabilidade de biomarcadores de estado redox no gastrocn?mio, cora??o e c?rebro de camundongos swiss submetidos a uma sess?o de exerc?cio m?ximo." UFVJM, 2017. http://acervo.ufvjm.edu.br/jspui/handle/1/1595.
Анотація:
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Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
O desbalan?o entre a produ??o de esp?cies reativas de oxig?nio e nitrog?nio e a a??o dos sistemas de defesa antioxidante ? uma condi??o conhecida como desequil?brio redox. O exerc?cio f?sico m?ximo ? associado ao aumento da produ??o de esp?cies reativas e pode ser utilizado como modelo fisiol?gico para o estudo do desequil?brio redox. Condi??es pr?-anal?ticas de manejo de amostras biol?gicas, como o tempo de congelamento, podem interferir na integridade de analitos. Assim, esse estudo avaliou o efeito do tempo de congelamento da amostra na quantifica??o de biomarcadores de estado redox no gastrocn?mio, cora??o e c?rebro de camundongos swiss submetidos a uma sess?o de exerc?cio m?ximo. Vinte e seis camundongos foram divididos em grupo controle, que n?o realizou exerc?cio, e grupo exerc?cio, submetido a uma sess?o de exerc?cio em piscina, com aumento progressivo de carga, at? a exaust?o. Os tecidos foram coletados imediatamente ap?s o protocolo experimental e seccionados para avalia??o a fresco e ap?s 1, 3 e 6 meses de congelamento a -80 ?C. O exerc?cio m?ximo modificou o estado redox de tecidos frescos, demonstrado pelo aumento da peroxida??o lip?dica, da atividade das enzimas antioxidantes catalase e super?xido dismutase e diminui??o da capacidade antioxidante total em todos os tecidos analisados e pelo aumento de derivados carbon?licos em prote?nas no gastrocn?mio e c?rebro. O efeito do exerc?cio sobre a peroxida??o lip?dica foi reduzido no gastrocn?mio congelado por 6 meses e no c?rebro e cora??o isso ocorreu j? com um m?s de congelamento da amostra. Por outro lado, o tempo de congelamento n?o alterou o efeito do exerc?cio sobre os derivados carbon?licos em prote?nas e a capacidade antioxidante total n?o enzim?tica. A resposta ao exerc?cio da catalase, em todos os tecidos, e da super?xido dismutase no gastrocn?mio foi reduzida ap?s um m?s de congelamento. J? no c?rebro e cora??o a resposta da super?xido dismutase ao exerc?cio foi reduzida apenas ap?s tr?s meses de congelamento. De maneira geral, os resultados desse estudo mostram que o tempo de congelamento afeta, de maneira dependente do tecido e do marcador em an?lise, a resposta de biomarcadores do estado redox a uma sess?o de exerc?cio m?ximo.
Disserta??o (Mestrado) ? Programa Multic?ntrico de P?s-gradua??o em Ci?ncias Fisiol?gicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017.
The imbalance between the production of oxygen and nitrogen species and the antioxidant system function is known as redox imbalance. Maximum physical exercise is associated with increased production of reactive species and can be used as a physiological model for the study of redox imbalance. Pre-analytical conditions, such as sample freezing duration, may interfere with analyte integrity. Thus, this study evaluated the effect of sample freezing duration on the quantification of redox biomarkers in the gastrocnemius, heart and brain of Swiss mice submitted to a maximal exercise session. Twenty-six mice were divided into control group, who did not exercise, and exercise group, who performed a maximal swim test. The tissues were collected immediately after the experimental protocol and sectioned for fresh evaluation and after 1, 3 and 6 months of freezing at -80 ? C. The maximal exercise modified the redox status of fresh tissues, demonstrated bythe increase on levels of lipid peroxidation, activity of the antioxidant enzymes catalase and superoxide dismutase and reduction of the total antioxidant capacity, in all the analyzed tissues, and by the increase of protein carbonyl content in the gastrocnemius and brain. The effect of exercise on lipid peroxidation was reduced in gastrocnemius frozen for 6 months and in the brain and heart this occurred in samples after one month of freezing. On the other hand, the freezing duration did not alter the exercise effect on proteins carbonyl content and the total non-enzymatic antioxidant capacity. The catalase response to exercise in all tissues and the superoxide dismutase response in the gastrocnemius were reduced after one month of freezing. However in the brain and heart the response of superoxide dismutase to exercise was reduced only after three months of freezing. This study shows that freezing duration, depending on the tissue and marker under analysis, affects the evaluation of the redox state response to a maximal exercise session.
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Pessoa, Christiana Andrade. "Estudo eletroquimico de corantes organicos com propriedades redox imobilizados sobre o fosfato de zirconio." [s.n.], 1997. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249657.
Анотація:
Orientador: Yoshitaka GushikemDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
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Mestrado
Книги з теми "O-redox":
1
Ferreira, Ana Paula. Alves Redol e o neo-realismo português. Lisboa: Caminho, 1992.
2
Silva, Garcez da. Alves Redol e o Grupo Neo-realista de Vila Franca. Lisboa: Caminho, 1990.
3
Falcão, Miguel. Espelho de ver por dentro: O percurso teatral de Alves Redol. Lisboa: Imprensa Nacional-Casa da Moeda, 2009.
4
Filho, Kleber Mendonça. Três roteiros: O som ao redor : Aquarius : Bacurau com Juliano Dornelles. [São Paulo, Brazil]: Companhia das Letras, 2020.
5
Oliveira, Jurema José de. O espaço do oprimido nas literaturas de língua portuguesa do século XX: Graciliano Ramos, Alves Redol e Castro Soromenho. Luanda: União dos Escritores Angolanos, 2008.
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Hotel Drouot. Estampes modernes Henri M. Petiet, vingt-sixieème vente: Par ou d'après G. Auriol, R.T. Bosshard, F. Buhot, E. Carrière, S. Dali, H. Daumier, E. Degas, H. Fantin-Latour, A. Gaudin, A. Guillaumin, Hermann-Paul, J.B. Isabey, J.B. Jongkind, J.É. Laboureur, M. Laurencin, A. Maillol, A. Masson, H. Matisse, J.F. Millet, Pascin, J. Pennell, H. Petitjean, P. Picasso, J.F. Raffaëlli, P.E. Ranson, O. Redon, P.A. Renoir, A. Rodin, W. Rothenstein, G. Roualt, K.X. Roussel, A. Sisley, C. Tcherniawsky, H. de Toulouse-Lautrec, M. Utrillo, F. Vallotton, J. Villon, M. de Vlaminck, A. Zorn; importantes estampes; beaux ensembles par Daumier, Laboureur, Laurencin, Maillol, Marini, Matisse, Picasso, Redon, Renoir, Rodin, Toulouse-Lautrec, Vallotton, Villon, Vlaminck. Paris: Picard Audap Solanet & Associès, 2002.
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Barrionuevo, Angela Beatriz, and Luciana Bonilaure. Quando o Mundo Cai Ao Meu Redor. Independently Published, 2014.
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Barbosa, Emerson. Pensamentos de um mendigo. Brazil Publishing, 2021. http://dx.doi.org/10.31012/978-65-5861-525-5.
Анотація:
Conheça a incrível e comovente história de Aurélio, um homem que viveu nas ruas e teve o dom de transformar, com a sua imaginação, tudo ao seu redor. Para ele, bastou querer e acreditar sempre! Você vai se emocionar com as suas histórias, rir e chorar ao mesmo tempo. Conheça o verdadeiro motivo de sua ida para as ruas.
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Mídia, cultura inovativa e economia criativa em tempos pandêmicos. Gradus Editora, 2020. http://dx.doi.org/10.46848/978684.
Анотація:
Em 11 de março de 2020, a pandemia do novo coronavírus é anunciada pela Organização Mundial da Saúde (OMS). Igualmente ao ocorrido na China e na Europa, o Brasil passa a experienciar o isolamento social. O Estado de São Paulo é o primeiro a decretar a quarentena a partir do 17 de março de 2020. Após meses de pandemia, o país está longe de voltar à normalidade e vencer sua maior crise sanitária. O vírus ceifou milhares vidas no Brasil e milhões ao redor do mundo. Escolas, universidades, comércio e diversos setores foram obrigados a se adaptar ao cenário de incerteza e medo. A desigualdade social se aprofundou e o desemprego aumenta a cada dia.
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Novas diretrizes frente ao envelhecimento: diversidades, cuidados, inclusão e visibilidade. Realize, 2022. http://dx.doi.org/10.46943/viii.cieh.2021.01.000.
Анотація:
O ano de 2021 certamente foi de desafios mas não incertezas. Ainda não resgatamos a liberdade e o contato “aberto” com forte abraço com os idosos, porém debruçamo-nos a estudar, aprofundarmos nos estudos, na pesquisa e estender o máximo de nós para eles. Tivemos novamente uma experiência online e nos sentimos tão perto que chegou a aquecer o coração. Este e-book está composto por mais de 40 trabalhos com muita qualidade, dedicação e atenção à população que envelhece ao nosso redor. Trabalhos que permearam reflexões, percepções, olhares somados a muita experiência, vivência e práticas. Da observação ao tratamento do idosos, da formação às condições de trabalho dos profissionais dedicados a melhorar a saúde, o XVIII Congresso Internacional de Envelhecimento Humano ancorou seus dias nas Novas diretrizes frente ao envelhecimento. Falamos de diversidades e não com olhar (in)diferente mas sim com a premissa de multiplicidade. Cuidado não faltou, desde a preparação do evento, que iniciou em 15/12/2020 até um abraço virtualmente recebido da nossa magnífica apresentadora Ana Célia em 13/11/2021. Não nos faltou inclusão pois o formato online possibilitou olhares de participantes ao redor do mundo e de todo o Brasil para dar visibilidade àquilo que a pandemia evidenciou fortemente: o idoso tem necessidades específicas! Espero que, nesta leitura, você possa extrair a essência de cada equipe de trabalho, a ciência por trás de cada objetivo, o cuidado nos detalhes de cada metodologia e a seriedade na apresentação dos resultados alcançados. Desejo a você uma leitura fixe :) (fixe é um termo usado em Portugal para algo agradável e tem qualidade positiva) Dra. Anna Quialheiro PhD em Saúde Coletiva
Частини книг з теми "O-redox":
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Itoh, Shinobu, Hirokatsu Kawakami, and Shunichi Fukuzumi. "Redox Catalysis of Novel Heterocyclic o-Quinone Coenzymes." In Novel Trends in Electroorganic Synthesis, 15–18. Tokyo: Springer Japan, 1998. http://dx.doi.org/10.1007/978-4-431-65924-2_4.
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Matta, J., E. Abi-Aad, D. Courcot, and A. Aboukaïs. "Simultaneous EPR and TPR Study of the V-Ce-O Catalysts Redox Properties." In Magnetic Resonance in Colloid and Interface Science, 365–74. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0534-0_31.
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Smiri, Moêz, Sami Boussami, Takwa Missaoui, and Amor Hafiane. "The Cadmium-Binding Thioredoxin O Acts as an Upstream Regulator of the Redox Plant Homeostasis." In Redox State as a Central Regulator of Plant-Cell Stress Responses, 275–96. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44081-1_13.
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Sawyer, Donald T. "The Redox Thermodynamics for Dioxygen Species (O2, O 2 - ·, HOO·, HOOH, and HOO-) and Monooxygen Species (O, O-·, ·OH, and -OH) in Water and Aprotic Solvents." In Oxygen Radicals in Biology and Medicine, 11–20. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5568-7_2.
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Gross, Johannes, Tamara Reiter, Christiane Wuensch, Silvia M. Glueck, and Kurt Faber. "Non-Redox Lyases and Transferases for C-C, C-O, C-S, and C-N Bond Formation." In Practical Methods for Biocatalysis and Biotransformations 3, 75–134. Chichester: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118697856.ch04.
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Tanaka, Hideo, Takao Nakahara, Hamid Dhimane, and Sigeru Torii. "Electroreductive Carbon-Carbon Bond-Making Reactions in Pb(O)/Pb(II) Redox Mediatory Systems. “Barbier Type” Allylation and Hydrocoupling of Imines in an Undivided Cell." In Electroorganic Synthesis, 241–47. Boca Raton: Routledge, 2023. http://dx.doi.org/10.1201/9780203758571-33.
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Zahari, Finn, Seongae Park, Mamathamba K. Mahadevaiah, Christian Wenger, Hermann Kohlstedt, and Martin Ziegler. "Redox-Based Bi-Layer Metal Oxide Memristive Devices." In Springer Series on Bio- and Neurosystems, 87–114. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-36705-2_3.
Анотація:
AbstractIn a memristor or a so-called memristive device, the resistance state depends on the previous charge flow through the device. The new resistance state is stored and classifies a memristor as a non-volatile memory device. This likewise unique and simple feature qualifies memristive devices as attractive compartments with regard to the development of a universal memory and beyond von Neumann computing architectures, including in-memory computing and neuromorphic circuits. In this chapter, we present studies on two kinds of bi-layer metal oxide memristive devices with the layer sequences Nb/NbO$$_{\textrm{z}}$$ z /Al$$_2$$ 2 O$$_3$$ 3 /Nb$$_{\textrm{x}}$$ x O$$_{\textrm{y}}$$ y /Au and TiN/TiO$$_\textrm{x}$$ x /HfO$$_\textrm{x}$$ x /Au, either prepared by reactive DC-magnetron sputtering, etching and optical lithography. It is shown that the memristive properties of such devices can be engineered, which enables tailoring of the memristive devices for particular applications.
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Brás, Patricia Sequeira. "O Som Ao Redor: Aural Space, Surveillance, and Class Struggle." In Space and Subjectivity in Contemporary Brazilian Cinema, 221–33. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48267-5_13.
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Absar, Nurul, Mohd Qaim Raza, Sminto Augustine, Shreyas Managave, D. Srinivasa Sarma, and S. Balakrishnan. "Trace, Rare-Earth Elements and C, O Isotope Systematics of Carbonate Rocks of Proterozoic Bhima Group, Eastern Dharwar Craton, India: Implications for the Source of Dissolved Components, Redox Condition and Biogeochemical Cycling of Mesoproterozoic Ocean." In Society of Earth Scientists Series, 297–326. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89698-4_13.
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Moser, Deise Cristiane, Roberta Sandoval Prado Fontanella, Débora Delwing-Dal Magro, Carla Werlang Coelho, and Daniela Delwing de Lima. "Inflamação crônica subclínica na obesidade: Respostas imunometabólicas, estado redox e exercício físico." In CIÊNCIAS DA SAÚDE E SUAS DESCOBERTAS CIENTÍFICAS. Seven Editora, 2023. http://dx.doi.org/10.56238/ciesaudesv1-076.
Анотація:
A obesidade grave e suas comorbidades estão associadas a um quadro de meta-inflamação que envolve múltiplos mecanismos subjacentes que atuam sinergicamente na resposta imunometabólica. Pesquisas recentes apontam para o papel central do exercício na modulação da inflamação subclínica crônica, em função da sua capacidade de recuperar a homeostase metabólica, equilibrando o estado redox e a dinâmica de secreção de marcadores anti e pró-inflamatórios, e regulando negativamente a expressão de genes. Do ponto de vista da saúde pública, o desafio é motivar a população com excesso de peso e obesidade a ter uma rotina regular de atividades físicas, considerando que o exercício físico é um componente importante nos programas que visam o tratamento da obesidade e suas comorbidades.
Тези доповідей конференцій з теми "O-redox":
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Comelli Grahl, Heloísa, Keysy Solange Costa Nogueira, and Carmen Fernandez. "O ensino de reações redox: uma revisão da literatura." In 20º Encontro Nacional de Ensino de Química. Recife, Pernambuco: Even3, 2021. http://dx.doi.org/10.29327/eneqpe2020.244999.
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Song, Yafang, Fred Bowyer, Benjamin Mills, ShuiChang Zhang, Don Canfield, Lewis Alcott, Graham Shields, and Simon Poulton. "Co-evolution of ocean redox, nutrient cycling and atmospheric O2 during the mid-Mesoproterozoic." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5916.
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Wang, Chao, Renbiao Tao, Lifei Zhang, Jesse Walters, Xi Zhu, Benedicte Menez, Baptiste Debret, Kai Yang, and Chunyuan Lan. "Origins of deep abiotic hydrocarbons: Insights from fundamental redox reactions within the Fe-C-H-O system." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.14810.
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PAULA, MATEUS GONÇALVES DE, LARA ALVES ROCHA, LUCIANA ORTEGA TELLES, VALéRIA DORNELLES GINDRI SINHORIN, ANDRé FERREIRA DO NASCIMENTO, GISELE FACHOLI BOMFIM, and RENATA DE AZEVEDO MELO LUVIZOTTO. "Óleo-resina de copaíba reduz adiposidade sem alterar marcadores oxidativos e inflamatórios no tecido adiposo de animais hígidos." In II Brazilian Congress of Health. HEALTH2021, 2021. http://dx.doi.org/10.51162/health2021-0004.
Анотація:
Este estudo foi delineado para avaliar o efeito do óleo-resina de copaíba sobre o peso corporal, adiposidade, bem como marcadores inflamatórios e do estado redox no tecido adiposo de animais hígidos. Ratos Wistar machos foram casualmente divididos em dois grupos: grupo controle (C, n = 7), o qual recebeu dieta padrão e o grupo óleo-resina de copaíba (OC, n = 7), que recebeu dieta padrão com suplementação de óleo-resina de copaíba, na dose de 200 mg/kg/dia, via gavagem, durante oito semanas. Os dados mostram que a suplementação com óleo resina de copaíba foi eficiente em diminuir o acúmulo de gordura visceral e, consequentemente, o índice de adiposidade sem alterar parâmetros metabólicos, marcadores inflamatórios ou marcadores do sistema antioxidante e de danos oxidativos no tecido adiposo. Concluindo, assim, que o óleo-resina de copaíba não apresenta efeitos prejudiciais ao tecido adiposo em animais hígidos.,
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Sun, Chenguang, and Cin-Ty Lee. "REDOX EVOLUTION OF MAGMAS WITH C-H-O-S VOLATILES DURING DEEP AND SHALLOW CRUSTAL CRYSTALLIZATION AND ITS IMPACT ON ATMOSPHERIC OXYGENATION." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370487.
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Tsuchiya, T., K. Terabe, M. Ochi, T. Higuchi, M. Osada, Y. Yamashita, S. Ueda, and M. Aono. "All-Solid-State Magnetic Properties Tuning Device Achieved by Redox Reaction of Fe3O4 Thin Film." In 2016 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2016. http://dx.doi.org/10.7567/ssdm.2016.m-3-03.
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Piestrzyński, Adam, Jadwiga Pieczonka, and Edward Chruściel. "Model for Long-Term Stabilization and Isolation of Low Level Uranium Waste." In ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1261.
Анотація:
Abstract Problems arising from uranium dispersion from mines and mine tailings, and the remediation of uranium contaminated areas, are discussed in this paper. In an experimental remediation study, a mixture of 70 vol.% of uraniferous mining wastes and 30 vol.% of a natural ceramic were used. The preliminary observations are discussed, and a model is proposed for the long term stabilization of mining tailings. Observations and monitoring of contaminated sites carried out during the last 25 years have revealed local impacts of uranium on the environment in Lower Silesia, Poland. Uranium pollution is limited to waste dumps, mine tailings, and their close vicinities at Kowary Podgórze, Radoniów, Kopaniec and Kletno. Uranium dispersion takes place mechanically due to transport by river waters, chemically by rain and ground waters, and anthropogenically when the wastes are utilized in construction. Floods are an additional mechanism responsible for the mechanical dispersion of uranium. As a result of these uranium transport mechanisms, in order to minimize the impacts of uranium on the environment, the covering of dumps with non-radioactive material is suitable only for sites located away from populated areas. Redox reactions have been observed at the Kowary tailings. During these reactions, iron hydroxide (goethite), hematite, and gypsum, are precipitated as solids. These observations provide a good prognosis for the long-term stabilization of radionuclides which can be incorporated into proposals for the construction of tailings sites. Using Eh-pH diagrams (system U-C-O-H, 25°C, 1 bar), UO2 is stable over the whole range of naturally occurring pHs, and is affected by Eh only in the range −0.4 to +0.1 volts in acidic environments, and below −0.4v in basal environments. BaSO4 and RaSO4 are stable under almost the same conditions as UO2. An environmentally significant redox boundary (FeS2 versus Fe2O3) occurs in the middle of the UO2 stability field. The geochemical and environmental behaviour of the elements discussed above suggest a mechanism for stabilizing radionuclides within stored wastes. The solidification of wastes should occur concurrently with naturally occurring redox reactions. During oxidation, an active iron-hydroxide gel is produced. This gel is then dehydrated and converted into limonite (a mixed compound), a monohydrate (goethite), hydro-hematite (Fe2O3·1/2H2O) and hematite (Fe2O3). This reaction occurs in neutral or weakly acidic environments. A key problem in the proposed remediation project, therefore, is pH stabilization in order to maintain the required environment for oxidation and cementation reactions. In order to achieve such an environment and to stabilize the reactions, a construction method is proposed for new waste storage systems, based on mixed layers of waste and barrier components composed of natural materials. The presence of CaO or Ca(OH)2 and anhydrite in the proposed internal membrane will reduce the vertical migration of sulphates. Redox reactions will be responsible for the secondary precipitation (reduction) of uranyl. These same reactions occur naturally during the precipitation of uranium ores. Iron oxidation is the other process in the redox pair required to reduce [UO2]+2 to UO2. The resultant pitchblende is insoluble in normal oxidizing environments. To minimize the dissolution of UO2 by sulphuric acid generated during the iron oxidation reaction, the construction of pH active membranes containing calcium oxide or hydroxide are recommended. These compounds will react with the free acid to precipitate gypsum. Although several elements can be mobilized as a result of oxidation, radium remains in insoluble solid phases such as the common Ca, Ba and Sr sulphates.
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Mat, A., K. S. Sulaiman, M. A. Sulaiman, M. F. Hasim, Mohamad Rusop, Rihanum Yahaya Subban, Norlida Kamarulzaman, and Wong Tin Wui. "Preparation of LiNi[sub 0.5]Mn[sub 1.5]O[sub 4] for Lithium Batteries Via Solid-State Redox Method using Nitrate and Acetate Based Reactants." In INTERNATIONAL CONFERENCE ON ADVANCEMENT OF MATERIALS AND NANOTECHNOLOGY: (ICAMN—2007). AIP, 2010. http://dx.doi.org/10.1063/1.3377793.
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Silva, Jiviane Beatriz Cunha Barretto, and Ana Paula Dias Demasi. "EXPRESSÃO DE PROTEÍNAS DO METABOLISMO DA GLICOSE NA ERITROPOESE." In I Congresso Brasileiro de Hematologia Clínico-laboratorial On-line. Revista Multidisciplinar em Saúde, 2021. http://dx.doi.org/10.51161/rems/629.
Анотація:
Introdução: Evidências indicam que o metabolismo orienta o destino das células-tronco hematopoéticas entre a auto renovação e a diferenciação. Particularmente para células eritróides, que perdem núcleo e organelas em estágios terminais, a via glicolítica deve ser crucial durante todo o processo de desenvolvimento. As principais proteínas envolvidas nessa via, como o transportador de glicose 1 (Glut1), a enzima glicolítica lactato desidrogenase (LDH) e a enzima reguladora metabólica piruvato desidrogenase quinase 1 (PDK1), podem ser úteis para a avaliação da eritropoese. Objetivos: Verificar a expressão das proteínas do metabolismo da glicose durante todo o processo de diferenciação eritróide na medula óssea. Material e métodos: Produtos de biópsia de medula óssea de 31 doadores saudáveis foram recebidos dos arquivos do departamento de anatomia patológica de instituição parceira, com aprovação do Comitê de Ética Institucional. Tais amostras foram processadas e incubadas com anticorpos primários para análise por imunohistoquímica. Os anticorpos utilizados foram específicos para Glut1, LDH, PDK1, hemoglobina, E-caderina e CD68. Este material foi também corado com hematoxilina-eosina. Resultados: A coloração imunohistoquímica mostrou que Glut1 foi expresso nas células eritróides durante todo o processo de diferenciação, mas LDH e PDK1 foram detectadas preferencialmente em células eritróides imaturas. No total, essas proteínas favoreceriam alta atividade glicolítica nos estágios iniciais, proporcionando equilíbrio energético e redox. Essa atividade diminuiria em direção aos estágios terminais, acompanhando o declínio na demanda de energia. Conclusão: Glut1 seria um marcador eritróide imunohistoquímico e de citometria de fluxo em todas as fases de maturação, enquanto LDH e PDK1 seriam adequados para distinguir células eritropoéticas imaturas.
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Mendes, Nelson. "A IDENTIFICAÇÃO DE VITAMINA C EM SUCOS DE FRUTAS INDUSTRIALIZADOS: UM ESTUDO EXPERIMENTAL DE BAIXO CUSTO." In III Congresso Brasileiro de Ciências Biologicas. Revista Multidisciplinar de Educação e Meio Ambiente, 2022. http://dx.doi.org/10.51189/iii-conbracib/8071.
Анотація:
Introdução: As reações de oxi-redução estão presentes em diversas situações do cotidiano, tais como na ingestão de alimentos. A vitamina C presente nos alimentos apresenta características químicas de um agente redutor forte e desempenha funções antioxidantes no organismo. Objetivo: Este trabalho teve por objetivo a elaboração de atividade experimental simples e de baixo custo para a identificação da presença de vitamina C em sucos de frutas industrializados. Material e Método: O experimento baseou-se na utilização de mistura amilácea (amido de milho + água) e tintura de iodo 2%, em diferentes amostras de sucos de caixinha (caju, manga, laranja e abacaxi) e de comprimido efervescente de 1 g de vitamina C. O teor de vitamina C (ácido ascórbico) ocorreu através da quantificação de gotas adicionadas da solução de iodo nas referidas amostras analisadas. Resultados: Foram utilizados apenas materiais plásticos descartáveis para retirar as alíquotas e armazenar as amostras, tais como seringas de 10 mL e copos descartáveis de 150 mL. Os resultados demonstraram que a solução do comprimido efervescente teve maior consumo de Iodo (20 gotas), como era esperado, pois quanto maior o consumo de Iodo mais rica será a amostra em ácido ascórbico. Dentre os sucos industrializados, o suco de Caju foi o que apresentou maior teor de vitamina C (8 gotas), seguido dos sucos de Manga (6 gotas), Abacaxi (4 gotas) e Laranja (3 gotas). Conclusão: Desse modo, consideramos que este experimento pode ser utilizado nas escolas como forma de contextualizar a abordagem das reações redox e despertar o interesse dos alunos para uma alimentação mais saudável.
Звіти організацій з теми "O-redox":
1
Antonio, M. R., and L. Soderholm. Redox behavior of europium in the Preyssler heteropolyanion [EuP{sub 5}W{sub 30}O{sub 110}]{sup 12-}. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/516035.
2
Banin, Amos, Joseph Stucki, and Joel Kostka. Redox Processes in Soils Irrigated with Reclaimed Sewage Effluents: Field Cycles and Basic Mechanism. United States Department of Agriculture, July 2004. http://dx.doi.org/10.32747/2004.7695870.bard.
Анотація:
The overall objectives of the project were: (a) To measure and study in situ the effect of irrigation with reclaimed sewage effluents on redox processes and related chemical dynamics in soil profiles of agricultural fields. (b) To study under controlled conditions the kinetics and equilibrium states of selected processes that affect redox conditions in field soils or that are effected by them. Specifically, these include the effects on heavy metals sorption and desorption, and the effect on pesticide degradation. On the basis of the initial results from the field study, increased effort was devoted to clarifying and quantifying the effects of plants and water regime on the soil's redox potential while the study of heavy metals sorption was limited. The use of reclaimed sewage effluents as agricultural irrigation water is increasing at a significant rate. The relatively high levels of suspended and, especially, dissolved organic matter and nitrogen in effluents may affect the redox regime in field soils irrigated with them. In turn, the changes in redox regime may affect, among other parameters, the organic matter and nitrogen dynamics of the root zone and trace organic decomposition processes. Detailed data of the redox potential regime in field plots is lacking, and the detailed mechanisms of its control are obscure and not quantified. The study established the feasibility of long-term, non-disturbing monitoring of redox potential regime in field soils. This may enable to manage soil redox under conditions of continued inputs of wastewater. The importance of controlling the degree of wastewater treatment, particularly of adding ultrafiltration steps and/or tertiary treatment, may be assessed based on these and similar results. Low redox potential was measured in a field site (Site A, KibutzGivat Brenner), that has been irrigated with effluents for 30 years and was used for 15 years for continuous commercial sod production. A permanently reduced horizon (Time weighted averaged pe= 0.33±3.0) was found in this site at the 15 cm depth throughout the measurement period of 10 months. A drastic cultivation intervention, involving prolonged drying and deep plowing operations may be required to reclaim such soils. Site B, characterized by a loamy texture, irrigated with tap water for about 20 years was oxidized (Time weighted average pe=8.1±1.0) throughout the measurement period. Iron in the solid phases of the Givat Brenner soils is chemically-reduced by irrigation. Reduced Fe in these soils causes a change in reactivity toward the pesticide oxamyl, which has been determined to be both cytotoxic and genotoxic to mammalian cells. Reaction of oxamyl with reduced-Fe clay minerals dramatically decreases its cytotoxicity and genotoxicity to mammalian cells. Some other pesticides are affected in the same manner, whereas others are affected in the opposite direction (become more cyto- and genotoxic). Iron-reducing bacteria (FeRB) are abundant in the Givat Brenner soils. FeRB are capable of coupling the oxidation of small molecular weight carbon compounds (fermentation products) to the respiration of iron under anoxic conditions, such as those that occur under flooded soil conditions. FeRB from these soils utilize a variety of Fe forms, including Fe-containing clay minerals, as the sole electron acceptor. Daily cycles of the soil redox potential were discovered and documented in controlled-conditions lysimeter experiments. In the oxic range (pe=12-8) soil redox potential cycling is attributed to the effect of the daily temperature cycle on the equilibrium constant of the oxygenation reaction of H⁺ to form H₂O, and is observed under both effluent and freshwater irrigation. The presence of plants affects considerably the redox potential regime of soils. Redox potential cycling coupled to the irrigation cycles is observed when the soil becomes anoxic and the redox potential is controlled by the Fe(III)/Fe(II) redox couple. This is particularly seen when plants are grown. Re-oxidation of the soil after soil drying at the end of an irrigation cycle is affected to some degree by the water quality. Surprisingly, the results suggest that under certain conditions recovery is less pronounced in the freshwater irrigated soils.
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Antonio, M. R., and L. Soderholm. Implications of the unusual redox behavior exhibited by the heteropolyanion [EuP{sub 5}W{sub 30}O{sub 110}]{sup 12{minus}}. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/510300.
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Ribeiro, Paulo, Maria Helena Vercillo, and Huáscar Eguino. Grandes eventos esportivos e planejamento de desenvolvimiento urbano: documentos de refêrencia e discussão. Inter-American Development Bank, July 2013. http://dx.doi.org/10.18235/0007886.
Анотація:
Esta publicação compreende um conjunto de estudos desenvolvidos como parte da Cooperação Técnica entre o Ministério do Esporte do Brasil e o BID intitulada "Grandes Eventos Esportivos e Planejamento de Desenvolvimento Urbano: Intercâmbio de Melhores Práticas" (BR-T1159). Os estudos contemplam uma análise sobre os benefícios que cidades e países ao redor do mundo auferiram com a realização de grandes eventos esportivos sob a ótica do planejamento urbano, e como as cidades-sede brasileiras podem, a partir dessas experiências, potencializar as iniciativas de preparação hora em andamento, de forma a garantir um legado duradouro para a população. Entre outras conclusões, os estudos reforçam a necessidade de alinhar os projetos de preparação das cidades-sede com os instrumentos de planejamento urbano de longo prazo, e utilizar os grandes eventos para alavancar recursos que permitam executar parte das iniciativas consideradas estratégicas no marco do desenvolvimento urbano.
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.
Анотація:
The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Ensinanzas do ámbito cultural. Setembro 2022. Consello da Cultura Galega, September 2022. http://dx.doi.org/10.17075/eac.2022.
Анотація:
O Consello da Cultura galega, a través do seu Observatorio da Cultura Galega, presenta este informe co obxecto de analizar a evolución das ensinanzas culturais en Galicia nos últimos dez anos en todas as etapas educativas e en todos os tipos de ensinanzas dispoñibles. Os indicadores fundamentais que recollerán as análises cobren principalmente datos de centros, alumnado e profesorado e as variables independentes máis utilizadas son a titularidade do centro e o sexo do alumnado e profesorado, cando existen estes datos. As series consideradas sitúanse ao redor dos dez cursos académicos, tamén segundo a dispoñibilidade e posibilidade comparativa das fontes, salvo no caso das ensinanzas universitarias, onde se optou por series algo menos extensas.