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The effect of silicon on the symptoms of manganese toxicity in maize plants.
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The effect of exogenously applied silicon (Si) on plant growth, lipid peroxidation, total phenolic compounds and non-protein thiols was studied in two maize varieties (Zea mays L. vars. Kneja 605, 434) differing in sensitivity to excess manganese (Mn). Based on the density of brown spots per leaf
Effects on the accumulation of calcium, magnesium, iron, manganese, copper and zinc of adding the two inorganic forms of selenium to solution cultures of Zea mays.
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The addition of selenate or selenite to common fertilizers for crop production could be an effective way of producing selenium-rich food and feed. However, this would be feasible only if the increase in plant selenium (Se) content did not negatively influence the uptake of other essential elements.
The maize bHLH transcription factor bHLH105 confers manganese tolerance in transgenic tobacco.
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Manganese (Mn) toxicity is an important limiting factor for crop production in acidic soils. The basic helix-loop-helix (bHLH) transcription factors are involved in a variety of physiological processes. However, whether the bHLHs are involved in excess Mn stress response is largely unknown. Here, we
Differential Accumulation of Manganese-Superoxide Dismutase Transcripts in Maize in Response to Abscisic Acid and High Osmoticum.
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The plant growth regulator abscisic acid (ABA) has multiple physiological effects during embryogenesis and seed formation. Although a number of genes induced by ABA have been characterized, the functions of the encoded proteins remain, for the most part, obscure. In this paper we demonstrate that
Dietary Manganese Modulates PCB126 Toxicity, Metal Status, and MnSOD in the Rat.
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PCB126 (3,3',4,4',5-pentachlorobiphenyl) is a potent aryl hydrocarbon receptor agonist and induces oxidative stress. Because liver manganese (Mn) levels decrease in response to PCB126, a Mn dietary study was designed to investigate the role of Mn in PCB126 toxicity. Male Sprague Dawley rats received
Toxicity of naturally-contaminated manganese soil to selected crops.
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The impact of manganese excess using naturally contaminated soil (Mn-soil, pseudototal Mn 6494 vs 675 μg g(-1) DW in control soil) in the shoots of four crops was studied. Mn content decreased in the order Brassica napus > Hordeum vulgare > Zea mays > Triticum aestivum. Growth was strongly depressed
Resolvin D1 Prevents the Impairment in the Retention Memory and Hippocampal Damage in Rats Fed a Corn Oil-Based High Fat Diet by Upregulation of Nrf2 and Downregulation and Inactivation of p66Shc.
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This study investigated the effect of a high-fat diet rich in corn oil (CO-HFD) on the memory retention and hippocampal oxidative stress, inflammation, and apoptosis in rats, and examined if the underlying mechanisms involve modulating Resolvin D1 (RvD1) levels and activation of p66Shc.
Increasing dietary lipid and iron content decreases manganese superoxide dismutase activity in colonic mucosa.
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Manganese superoxide dismutase (MnSOD) is an important mitochondrial antioxidant. Alteration in the regulation of MnSOD activity has been proposed to play a critical role in the development of many types of tumors. Colorectal cancer is one of the most common human malignancies and has been shown to
Manganese status, gut endogenous losses of manganese, and antioxidant enzyme activity in rats fed varying levels of manganese and fat.
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We hypothesized that manganese deficient animals fed high vs moderate levels of polyunsaturated fat would either manifest evidence of increased oxidative stress or would experience compensatory changes in antioxidant enzymes and/or shifts in manganese utilization that result in decreased endogenous
Dietary manganese intake and type of lipid do not affect clinical or neuropsychological measures in healthy young women.
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Because manganese (Mn) is potentially toxic, and because dietary fat type may affect Mn absorption, the objectives of the current study were to determine whether diets containing very low or very high amounts of Mn and enriched in either saturated or unsaturated fats affected measures of
Impacts of manganese mining activity on the environment: interactions among soil, plants, and arbuscular mycorrhiza.
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The mining district of Molango in the Hidalgo State, Mexico, possesses one of the largest deposits of manganese (Mn) ore in the world. This research assessed the impacts of Mn mining activity on the environment, particularly the interactions among soil, plants, and arbuscular mycorrhiza (AM) at a
Decrease of manganese superoxide dismutase activity in rats fed high levels of iron during colon carcinogenesis.
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Diets high in fat or iron have been associated with an increased risk for development of colon cancer. These two dietary factors are known to decrease manganese superoxide dismutase (MnSOD) activity in colonic mucosa. MnSOD is an antioxidant enzyme that protects mitochondria from oxygen radical
The effects of manganese and copper in vitro and in vivo on peroxidase catalytic cycles.
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Here we present the results of in vitro and in vivo studies of the influence of Mn²+ and Cu²+ on the peroxidative and oxidative catalytic functions of class III peroxidase. Complex peroxidase catalysis by intermediates generated in the reaction was analyzed by utilizing the activating effect of Mn²+
Neurotoxic effects of methylcyclopentadienyl manganese tricarbonyl (MMT) in the mouse: basis of MMT-induced seizure activity.
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Methylcyclopentadienyl manganese tricarbonyl (MMT) is an organic manganese-containing compound which is used as an additive in unleaded gasoline. One neurotoxic effect of MMT in mice is seizure activity. In this study, seizures were observed in mice treated with MMT in propylene glycol or corn oil.
An ESR study of manganese binding in plant tissue.
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Two different fractions of manganese were found in the maize plant root apoplasm (intercellular space containing cell walls) after soaking the roots in MnCl2 solutions (concentration range 0.01-10 mmol.l-1): (a) an Mn2+ fraction in the water free space (WFS) which gave a characteristic six-line
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