Topic
Zinc toxicity
About: Zinc toxicity is a research topic. Over the lifetime, 727 publications have been published within this topic receiving 34583 citations. The topic is also known as: zinc poisoning.
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TL;DR: Suckling lambs maintained for 4 weeks on a milk-substitute diet containing 407 g Toprina yeast/kg dry matter of diet exhibited poor growth, low appetite and extensive renal damage.
Abstract: 1. Suckling lambs maintained for 4 weeks on a milk-substitute diet containing 407 g Toprina yeast/kg dry matter of diet exhibited poor growth, low appetite and extensive renal damage. 2. The batch of yeast used contained 2065 mg zinc/kg. 3. The kidneys of lambs offered a milk diet supplemented with the same Zn content as the yeast-fed diet (32.1 mg Zn/1000 kJ) were similarly affected.
17 citations
17 citations
TL;DR: The results suggest that primary antioxidative response originates in leaves of Lablab, while roots are involved in direct uptake of heavy metals and are not adept in extrusion.
Abstract: Zinc toxicity to plants occurs in soils contaminated by mining and smelting activities, in agricultural soils treated with sewage sludge, and in urban and peri-urban soils enriched by anthropogenic inputs of Zn. Zinc-induced stress in Hyacinth bean (Lablab purpureus) was investigated by growing seedlings in hydroponics, supplemented with Zinc (0-600 µM), under controlled growth conditions. Changes in growth parameters, enzyme activities and other stress response factors, as a function of Zn uptake are directly or indirectly related to the cellular free radical scavenging systems. These parameters were studied in 10-day old Lablab seedlings over 72 h of exposure. Relative to leaves, roots accumulated ~12-fold higher amounts of Zn. Oxidative stress markers, H 2 O 2 , malondialdehyde, ascorbate, proline, soluble sugars, putrescine and spermidine were elevated in both tissues, whereas, glutathione and spermine levels showed a steady decline. Total phenol increased in roots, but decreased in leaves. Zn-stress enhanced antioxidant enzymes, guaiacol peroxidase, glutathione reductase, and polyphenol oxidase in concentration and time dependent manner in leaves, but showed an inverse relationship in roots. Catalase decreased in both leaves and roots. Metabolic enzymes β-amylase and acid phosphatase increased in both tissues. Invertase increased in leaves but declined drastically in roots. The results suggest that primary antioxidative response originates in leaves of Lablab, while roots are involved in direct uptake of heavy metals and are not adept in extrusion. Also, lower concentrations of Zn (up to 100 µM) stimulate growth of Lablab, but higher concentrations proved detrimental to the plant.
17 citations
TL;DR: NaCl supplementation alleviated the effects of Zn toxicity on growth, and Juncus acutus plants were able to maintain higher net photosynthesis than in the absence of added NaCl, contributing to preserving the trade-off between CO2 acquisition and water loss, as indicated by higher intrinsic water use efficiency (iWUE).
17 citations
TL;DR: Impaired postnatal growth, independent of feed consumption, and multiple endocrinopathies were observed following short-term exposure to the high Zn diet, indicating that impaired growth of HZ birds may be caused, in part, by reduced thyroidal function.
17 citations