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| Registros recuperados: 59 | |
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| ELLWANGER,JOEL H.; FRANKE,SILVIA I.R.; BORDIN,DIANA L.; PRÁ,DANIEL; HENRIQUES,JOÃO A.P.. |
| ABSTRACT Parkinson's disease is characterized by the death of dopaminergic neurons, mainly in the substantia nigra, and causes serious locomotor dysfunctions. It is likely that the oxidative damage to cellular biomolecules is among the leading causes of neurodegeneration that occurs in the disease. Selenium is an essential mineral for proper functioning of the brain, and mainly due to its antioxidant activity, it is possible to exert a special role in the prevention and in the nutritional management of Parkinson's disease. Currently, few researchers have investigated the effects of selenium on Parkinson´s disease. However, it is known that very high or very low body levels of selenium can (possibly) contribute to the pathogenesis of Parkinson's disease,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neurodegeneration; Nutrition; Oxidative stress; Parkinson's disease; Selenium. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501655 |
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| Martins,Maristela; Pacheco,Ariane Mendonça; Lucas,Ana Cyra Santos; Andrello,Avacir Casanova; Appoloni,Carlos Roberto; Xavier,Jose Junior Mendonça. |
| A study was carried out to evaluate the association of levels of radioactivity, selenium and aflatoxin in shelled Brazil nuts, which were classified in different sizes, for export. The selenium determinations were performed by inductively coupled plasma optical emission spectrometry (LOQ = 3.0 µg g-1), and aflatoxins were detected by Liquid chromatography-mass spectrometry (LOQ = 0.85 µg kg-1), recovery rates were between 92 and 100%. Radioactivity was measured by high-resolution gamma spectrometry. The selenium mean concentration was (22.7 ± 7.4) µg g-1. (n = 30). Mean activities determined for the following radium isotopes were: 15.77 Bq kg-1 for 224Ra, 104.8 Bq kg-1 for 226Ra and 99.48 Bq kg-1 for 228Ra. For 226Ra, the levels did not vary significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Radioactivity; Selenium; Bertholletia excelsa. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000100018 |
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| Carmo,Thiago de Jesus do; Peripolli,Vanessa; Costa Jr,João Batista Gonçalves; Tanure,Candice Bergmann; Fioravanti,Maria Clorinda Soares; Restle,João; Kindlein,Liris; McManus,Concepta. |
| ABSTRACT Forty Nelore cattle were used to evaluate the effects of supplementation with different antioxidants on carcass characteristics and meat quality of feedlot cattle. Animals were fed Brachiaria brizantha hay and subjected to five treatments (control and four antioxidants: zinc, selenium, vitamin E, and selenium + vitamin E). After a 105-day feeding period, cattle were slaughtered. Tissue composition, as well as carcass proximate composition, color, tenderness, pH, and fatty acid profile were evaluated. Analysis of variance was carried out and means compared by Tukey test at 0.05 probability. The group fed selenium showed the lowest muscle amount (66.61 g/100 g) compared with the other antioxidants evaluated. There was no difference among treatments... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fatty acid; Saponin; Selenium; Vitamin E; Zinc. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000200138 |
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| Ghalib,Aslam Khan; Yasin,Muhammad; Faisal,Muhammad. |
| Two thermophilic Bacillus cereus strains (B. cereus-TA2 and B. cereus-TA4) used in the present study were isolated from the geothermal spring of Hunza valley, Gilgit, Pakistan. They showed the ability to withstand and grow at high temperature (85°C). Both these strains could resist multiple metals (copper, cadmium, mercury, manganese, zinc, arsenic, chromium and selenium). Strain B. cereus-TA4 reduced Cr (VI) at pH 5.0 to 9.0 but maximum reduction (83%) was observed at pH 7.0 after 48 h when initially supplied with 200 µg mL-1of K2CrO4. Lower initial concentrations such as 100 µg mL-1 supported higher reduction (90 to 95%) than that of high concentration such as 500 µg mL-1 (20 to 30%). Both the strains reduced nearly 70% of Se (IV) after 48 h of growth at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromium; Bioremediation; Selenium; Heavy metals. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000400554 |
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| BOMFIM, J. M.; MARTINS, T. P.; PINHEIRO, R. R.; FAÇANHA, D. A. E.; SILVEIRA, R. M. F.; OLIVEIRA, M. C. de; SOUZA, V. de; VASCONCELOS, A. M. de.. |
| Resumo: Objetivou-se, avaliar o comportamento termorregulador de cabras Saanen suplementadas com selênio orgânico na dieta e criadas em ambiente tropical. Foram utilizadas 12 cabras, não prenhes e clinicamente saudáveis; criadas de forma semiextensiva, pela manhã ficavam em pasto nativo e à tarde retornavam para o galpão, permanecendo em baias individuais e recebia concentrado à base de milho e farelo de soja, 250g/animal. Durante 21 dias foram suplementadas com selênio orgânico oferecido na forma de levedura, adicionado ao concentrado de acordo com as recomendações da empresa fornecedora. Foram realizadas aferições a Temperatura Retal, Frequência Respiratória, Temperatura Superficial da pele, nos turnos da manhã e tarde. Os dados meteorológicos foram... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Raça Saanen; Semiárido; Brasil; Nordeste; Caprino; Cabra leiteira; Termorregulação; Nutrição animal; Suplemento alimentar; Suplemento mineral; Microelemento; Selênio; Antioxidade; Goats; Thermoregulation; Supplementary feeding; Mineral supplements; Trace elements; Selenium; Antioxidants; Semiarid zones; Brazil. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1059793 |
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| SHALINI,SONIA; BANSAL,MOHINDER P. |
| Previous studies have shown that transcription factors, API and NFkB exert important roles in the process by which selenium regulates spermatogenesis. Glutathione, an intracellular thiol, acts as a source of reducing power and aids in maintenance of the cellular redox status. The activities of selenium are closely related to the availability of glutathione. Presently, mouse testicular cells were cultured in the presence of BSO, a known glutathione depletor, to generate oxidative stress. Selenium (Se) was added as sodium selenite to these cells at concentrations of 0.5 µM and 1.5 µM. It was observed that at 1.5 µM, Se acted as a pro-oxidant and significantly decreased the redox ratio. RT PCR analysis revealed that cjun, cfos expression increased in... |
| Tipo: Journal article |
Palavras-chave: API; BSO; GSH; NFkB; Oxidative stress; Selenium; Testicular cells. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000400005 |
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| BIANCHI, S. R.; AMARAL, C. D. B. do; SILVA, C. S. da; NOGUEIRA, A. R. de A.. |
| Determination of Se by inductively coupled plasma mass spectrometry (ICP-MS) can be difficult due to spectral interferences; however, these interferences can be eliminated by using collision-reaction interface (CRI) technology. A simple and fast procedure for determination of total Se concentration in bovine semen by ICP-MS after sample solubilization with diluted formic acid is here proposed. Formic acid caused an increase of up to 50% in selenium net signals and the maximum gain was obtained at 10% v v-1 formic acid solution. The optimized nebulizer gas flow rates were 1.05 and 0.95 L min-1, and radio frequency applied power were 1.3 and 1.4 kW without and with CRI, respectively. Microwave-assisted acid digestion was also implemented in the preparation... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Bovine semen; Cattle fertility; Selenium. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1079670 |
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| Seriani, Robson; Instituto de Pesca-SP - IP/SAA.; Ranzani-Paiva, Maria José Tavares; Instituto de Pesca-SP - IP/SAA.; Gonçalves, Adriano; Centro de Aquicultura, Universidade Estadual Paulista “Júlio de Mesquita Filho"; Siqueira, Silmara Regina; Instituto de Pesca-SP - IP/SAA.; Lombardi, Julio Vicente; Instituto de Pesca-SP - IP/SAA.. |
| Selenium (Se) is described as an essential micronutrient and participates in different biological functions, as the antioxidant defense systems maintenance and regulation. However, when in high concentrations, Se may cause toxic effects as well as hematological changes in fish. The aim of the present study was to determine the toxicity of selenium in the form of sodium selenate (Na2Se6+O4) in Oreochromis niloticus based on hematological parameters, after exposure to different concentrations (0.01, 0.14 and 1.4 mg Se6+ L-1). The erythrocytic and leukocytic series were examined over 14 days at intervals of 0, 3, 5, 7,10 and 14 days. The erythrocytic series showed significant alterations in the first 7 days, including the control group. Neutrophils and... |
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Palavras-chave: 2.07.01.00-4 haematological; Water pollution; Selenium; Toxicity Fisiologia. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8755 |
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| Leal,M.L.R.; Rocha,J.B.T.; Corte,C.L.D.; Aires,A.R.; Rocha,J.F.X.; Zanatta,R.S.; Carpes,J.L.S.; Szinwelski,G.A.; Stefanello,S.; Pivoto,F.L.. |
| ABSTRACT The aim of the present study was to report the in vivo distribution of selenium in sheep. For this, animals were allocated into two groups (control group and treated group) and kept in metabolic cages for a period of 37 days. The treated group received a single dose (6µmol/kg) of Diphenyl Diselenide, intravenously. Plasma and erythrocytes samples were collected at different times. Adipose tissue, muscles (latissimusdorsi, semitendinosus, and supra-scapular) heart, liver, lung, kidney, intestine and brain were sampled at 30 days post-treatment, in order to determine the selenium concentration. The results demonstrated that the selenium, from the Diphenyl Diselenide group, was higher in erythrocytes (4.8mg/L, six hours post-treatment) when compared... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidant; Ovine; Selenium; Tissue. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000401017 |
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| ROSA, C. R.; GOMES NETO, J. A.; NOBREGA, J. A.; NOGUEIRA, A. R. de A.. |
| A demanda crescente por alimentação balanceada tem despertado interesse em dietas diferenciadas baseadas em alimentos funcionais, os quais possuem propriedades ou substancias bioativas capazes de modular alguma função no organismo. As crucíferas, vegetais com capacidade de absorver altos teores de Se, compõem um grupo de uma série de alimentos desse tipo. A determinação de Se nesses vegetais é de interesse em função tanto de sua importância no metabolismo humano e animal como do ponto de vista de sua toxicidade. Com relação a determinação de Se por espectrometria de absorção atômica com atomização eletrotérmica em forno de grafite (GFAAS), os modificadores químicos convencionais mais citados são: Pd(NO3)2, Mg(NO3)2, Ni(NO3)2, Pd(NO3)2 + Mg(NO3)2,- Pd(NO3)2... |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Selenio; Modificadores quimicos; GFAAS; Selenium. |
| Ano: 1999 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/44621 |
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| Shabani,Roozbeh; Fakhraei,Jafar; Yarahmadi,Hossein Mansoori; Seidavi,Alireza. |
| ABSTRACT An experiment was conducted based on a completely randomized design with 500 Ross 308 broiler chickens to investigate the effect of three different sources of selenium on performance and characteristics of immune system. Chickens were arranged in 10 treatments and five repetitions (10 chickens for each repetition). Ten treatments of experimental diet were considered in the study, including a basal diet (control); 0.5, 0.8, and 1.2 mg nano-selenium + basal diet (three treatments); 0.5, 0.8, 1.2 mg selenomethionine + basal diet; and 65, 80, and 100 mg vitamin E + selenium + basal diet. Findings suggested that adding selenomethionine (1.2 mg) to the basal diet resulted in a significant effect on feed conversion ratio and weight of broilers. In fact,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler; Immune response; Immunoglobin; Selenium. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100535 |
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| Hada,FH; Malheiros,RD; Silva,JDT; Marques,RH; Gravena,RA; Silva,VK; Moraes,VMB. |
| The objective of this study was to evaluate the performance, carcass and parts yield, and blood changes in broilers fed different protein, carbohydrate, and lipid levels. Birds were fed a commercial diet until seven days of age. On day 8, birds were distributed according to a completely randomized experimental design in a 4 x 2 factorial arrangement (control diet, low protein diet, low carbohydrate diet or low lipid diet vs. supplementation of 0 or 0.3ppm organic selenium) with four replicates of 15 birds each. Broilers fed low protein presented lower body weight, feed intake, and worse feed conversion ratio on day 42, as well as lower carcass and breast yields, higher leg and abdominal fat yields, higher triglyceride and lower uric acid blood levels.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbohydrates; Lipids; Blood parameters; Protein; Selenium. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000400014 |
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| Ramírez-Bribiesca,J.E.; Tórtora,J.L.; Huerta,M.; Hernández,L.M.; López,R.; Crosby,M.M.. |
| Three experiments were carried out to determine the optimum selenium-vitamin E injection level to maintain acceptable blood selenium (Se) status of does and kids, as well as to determine the relation of that status to mortality rates in kids. In experiment 1, 238 goats were assigned to one of three groups during the mating period: A1-control, A2- 0.06mgSe+0.8IU vitE/kgBW and A3-0.125mgSe+1.7IU vitE/kgBW. No differences (P>.05) for fertility and prolificacy were observed among the groups. Blood Se concentration did not differ among Se-vit E groups and control group before injection, and both groups showed Se deficient condition. There was a trend (P<.05, 32%) to increase Se blood level 60 days post-treatment, but difference was not observed between A2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Goat; Selenium; Vitamin E; México. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000100011 |
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| Laganá,C; Ribeiro,AML; Kessler,AM; Kratz,LR; Pinheiro,CC. |
| The objective of this experiment was to evaluate the effect of diet supplementation with vitamins C and E and organic minerals Zn and Se on the performance of 1 to 35 day-old broilers from, kept under cyclic heat stress (25 to 32ºC). Four levels of vitamin-mineral supplementation were used (T1-control diet (60/30 IU of vit E for starter and growing diet, respectively, zero vit. C, 80 ppm of inorganic Zn, 0.3 ppm of inorganic Se); T2-control diet + 100 UI vit E and 300 ppm vit C/kg; T3-control diet + 40 ppm Zn and 0,3 ppm Se/kg; T4-control diet + T2 and T3 levels) and two environments - thermoneutral and cyclic heat stress (TN and HS) from 14 to 35 days of age. In the period when part of the birds was submitted to HS, from 14 to 35 days, it was observed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ascorbic acid; Dl-alpha-tocopherol; Selenium; Thermal regulation; Zinc. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000100006 |
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| Registros recuperados: 59 | |
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