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| Registros recuperados: 29 | |
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| Reséndiz Hernández, Miriam. |
| El objetivo de este estudio fue evaluar el efecto de dos fuentes orgánicas queladas comerciales, Cr-levadura y Se-levadura, y de Saccharomyces cerevisiae (SC), en la digestibilidad in situ de la MS, FDN, FDA y PC; pH, AGV y N-NH3 en el rumen; consumo de MS, ganancia diaria de peso (GDP), conversión alimenticia (CA), peso y contenido de grasa de la canal de borregos. Los tratamientos fueron: 1) testigo (T; sin Cr, Se, ni SC); 2) T + Cr + Se; 3) T + SC; y 4) T + Cr + Se + SC, los cuales se asignaron al azar a 20 borregos criollos (29.88 ± 2.98 kg) en finalización para el experimento de variables productivas; y en un cuadro latino 4 x 4 con cuatro borregos machos (30 ± 2 kg) con cánula ruminal para evaluar degradación in situ y variables de fermentación... |
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Palavras-chave: Cromo; Selenio; Levadura; Ovinos; Digestibilidad; Rumen; Chromium; Selenium; Yeast; Sheep; Digestibility; Maestría; Ganadería. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/750 |
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| Plaza Cazón,Josefina; Viera,Marisa; Donati,Edgardo. |
| Background: The increased industrial activity has resulted in the discharge of large amount of pollutants including non-degradable metals into the environment. Chromium is produced in several industrial processes and it can be found in the environment in two stable oxidation states, Cr(VI) and Cr(III). Cr(VI) is more hazardous due to its carcinogenic and mutagenic effects on living organisms. Although much less toxic, Cr(III) can also exert genotoxic effects under prolonged or severe exposure. It can be separated from the solution by precipitation but biosorption using brown algae seems to be an effective and sustainable treatment technique owing to its cost-effectiveness and environmental friendly characteristics. Macrocystis pyrifera and Undaria... |
| Tipo: Journal article |
Palavras-chave: Biosorption; Brown algae; Chromium; Heavy metals. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300006 |
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| Matsumoto,Silvia Tamie; Mantovani,Mário Sérgio; Malaguttii,Mirtis Irene Ariza; Dias,Ana Lúcia; Fonseca,Inês Cristina; Marin-Morales,Maria Aparecida. |
| Cytotoxicity of metals is important because some metals are potential mutagens able to induce tumors in humans and experimental animals. Chromium can damage DNA in several ways, including DNA double strand breaks (DSBs) which generate chromosomal aberrations, micronucleus formation, sister chromatid exchange, formation of DNA adducts and alterations in DNA replication and transcription. In our study, water samples from three sites in the Córrego dos Bagres stream in the Franca municipality of the Brazilian state of São Paulo were subjected to the comet assay and micronucleus test using erythrocytes from the fish Oreochromis niloticus. Nuclear abnormalities of the erythrocytes included blebbed, notched and lobed nuclei, probably due to genotoxic chromium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium cepa; Chromium; Chromosomes aberrations; Comet assay; Micronucleus; Oreochromis niloticus. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100028 |
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| Gueguen, Yannick; Saulnier, Denis; Santini, Adrien; Magre, Kevin; Garen, Pierre; Bernagout, Solene; Nohl, Marine; Bouisset, Patrick; Helme, Herehia; Planes, Serge; Le Moullac, Gilles. |
| This study was designed to identify in the pearl oyster Pinctada margaritifera, used as a bio-accumulator, molecular biomarkers for the presence of heavy metals in the lagoon environment. Pearl oysters were exposed to 2 concentrations (1 and 10 μg L− 1) of cadmium (Cd) and chromium (Cr) compared to a control. Twelve target genes encoding proteins potentially involved in the response to heavy metal contamination with antioxidant, detoxification or apoptosis activities were selected. P. margaritifera accumulated Cd but not Cr, and mortality was related to the amount of Cd accumulated in tissues. In response to Cd-Cr contamination, metallothionein (MT) was significantly up-regulated by Cd-Cr at both concentrations, while 7 others (SOD, CAT, GPX, GSTO, GSTM,... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; French Polynesia; Cadmium; Chromium; Gene expression; Metallothionein. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00376/48707/49146.pdf |
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| Hongo, Akio; Ishii, Yukiko; Suzuta, Hidetaka; Enkhee, Devee; Toukura, Yuji; Hanada, Masaaki; Hidaka, Satoshi; Miyoshi, Syunzou; 本江, 昭夫; 石井, 友紀子; 鈴田, 英隆; エンヒェー, デヴィ; 藤倉, 雄司; 花田, 正明; 日高, 智; 三好, 俊三. |
| The study was conducted in Obihiro, Japan to examine the position and rate of intestinal fermentation in three adult ostriches (Struthio camelus) with mean liveweight of 103±4.7 kg. The ostriches were fed fresh leaves of orchardgrass (Dactylis glomerata). At twenty five hours before the slaughter, they ingested 100 g fresh leaves mixed with 20 g oblong strips (2mm wide and 30 mm long) of a filter paper, in which chromium oxide was absorbed at a rate of 40 %. After the slaughter, small intestine, cecum and large intestine were cut into 3, 2 and 7 pieces, respectively, with the same length in each organ. Crude ash content in digesta samples was the highest in muscular stomach (90.1±1.17 %), compared with 27-51 % in other organs of glandular stomach, small... |
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Palavras-chave: Adult ostrich; Chromium; Colon; Fermentation; Volatile fatty acid; ダチョウ成鳥; クロム; 結腸; 醗酵; 揮発性脂肪酸. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/92 |
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| SOLANGE SÁNCHEZ,MARÍA; TORRENEGRA,RUBÉN DARÍO; MARTÍNEZ,HERNÁN; SALAZAR,CLAUDIA EUGENIA; BARAHONA,ROLANDO. |
| Dumps are sites where the presence of high heavy metal (HM) concentration is a common occurrence, creating the need for implementing restoration processes immediately after their closure. In the 7.6 ha and 45 m high Morro de Moravia dump, arose from the disposal of Medellín solid wastes from 1974 to 1984, previous studies have demonstrated high contents of contaminants, including HM, prompting the need to identify effective mechanisms to implement its restoration. The objective of this study was to evaluate the adaptation, growth and phytoremediation capacity of Bidens pilosa, Lepidium virginicum, Brachiaria decumbens and Arachis pintoi. Content of HM (mg/kg) in Moravia residue matrix went from 17 to 8193 for Pb, 44 to 564 for Cr, 0.2 to 339 for Cd and 77... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bidens pilosa; Brachiaria decumbens; Chromium; Lead; Phytoremediation. |
| Ano: 2010 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2010000200019 |
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| Iannacone O.,José; Alvariño F.,Lorena. |
| Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr(2)0(7)), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity... |
| Tipo: Journal article |
Palavras-chave: Heavy metals; Peru; Seeds; Vascular plants; Seeds; Mining waste; Chromium; Mercury; Lead. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200009 |
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| Bourotte,Christine; Bertolo,Reginaldo; Almodovar,Marta; Hirata,Ricardo. |
| Anomalous concentrations of hexavalent chromium have been detected in ground-water of the Adamantina Aquifer inat least 54 municipalities located in the northwestern region of the State of São Paulo, southeast Brazil, occasionallyexceeding the permitted limit for human consumption (0.05 mg.L-1). An investigation was conducted in the municipality of Urânia, where the highest concentrations of chromium were detected regionally. It was defined that the originof this contamination is natural, since high concentrations of chromium were detected in aquifer sandstones (averageof 221 ppm) and also in pyroxenes (6000 ppm), one of the main heavy minerals found in the sediments. Besides, noother possible diffuse or point sources of contamination were observed in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromium; Ground-water; Aquifer; Natural contamination. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200009 |
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| Fonseca,L.A; Girardi,F.M; Coelho,C.S; Barioni,G; Rangel,V.B; Gonçalves,R.C. |
| The influence of chromium supplementation on some blood variables in 11 adult stallions used for policing activities was evaluated. Each animal was treated with 11mg of chromium/400kg body weight, orally, for a period of 30 days. On days 0 (before) and 30 (after) the animals were evaluated and blood samples were obtained before and after exercise. Plasma glucose and lactate and serum cortisol and insulin were analyzed in each of these moments. On day 0, plasma glucose concentrations were 68.4±5.6mg/dL and 78.7±6.5mg/dL; plasma lactate concentrations were 6.2±0.6mg/dL and 13.1±7.6mg/dL; serum cortisol values were 48.5±7.9ng/mL and 42.6±19.7ng/mL; and serum insulin values were 3.0±6.4µUI/mL and 1.9±1.7µUI/mL, respectively, before and after exercise. On day... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equine; Biochemistry; Chromium; Exercise. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352011000500019 |
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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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| Registros recuperados: 29 | |
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