copper is a micronutrient which its, deficiency can alter essential functions in plant metabolism. on the other hand, excess copper is present in certain regions and environments, and can be potentially toxic to plants causing phytotoxicity by the formation of reactive oxygen species that damage cells. in this study, we examined the effect interactions between various concentrations of sodium n...

To elucidate effect of chemical reagents addition on growth of aquatic plants in restoration of aquatic ecosystem, Spirodela polyrrhiza (L.) Schleid was used to evaluate its physiological responses to excess iron (Fe(3+)) and copper (Cu(2+)) in the study. Results showed that accumulation of iron and copper both reached maximum at 100 mg L(-1) iron or copper after 24 h short-term stress, but exc...

introduction: there have been many reports and papers on deficient, normal and high levels of copper in patients with thalassemia major. the aim of this study is to evaluate copper status in a series of more than 300 patients with thalassemia major and determine the degree of copper deficiency or excess. methods: three hundred and seventy patients with thalassemia major over 5 years of age were...

Four rat experiments were done to determine the effect of copper supplementation, in excess of the rat’s nutritional needs, on body weight and blood and liver lipids. Excess copper in the form of gluconate or yeast had no effect on weight gain. It significantly diminished the concentration of serum cholesterol and serum triglycerides. Excess copper raised the concentration of serum high density...

The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust-Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed. Oxidation and stability were studied by UV-vis, XRD, and TEM. Alkanethiols and oleic acid were found to improve air stabil...

Concentrations of copper, arsenic and cadmium in sediments and soils deposited on the flood plain of the upper Clark Fork River drainage were determined to be one to two orders of magnitude greater than in soils from typical noncontaminated systems. Aerial deposition of metal particulates during the period of smelting activities (1884-1980) has contributed approximately 2% of the excess copper,...

Copper (Cu) and its alloys are used extensively in domestic and industrial applications. Cu is also an essential element in mammalian nutrition. Since both copper deficiency and copper excess produce adverse health effects, the dose-response curve is U-shaped, although the precise form has not yet been well characterized. Many animal and human studies were conducted on copper to provide a rich ...

Abstract In this study ameliorative effects of ascorbic acid (0.5 mM) on onion (Allium cepa L. cv. Red Azarshahr) under copper stress (Cu: 6.5 μM) were studied. Fresh weights of leaves and roots were reduced in seven week old plants under excess copper condition. Cu stress also reduced membrane stability index in leaves. There was a considerable increase in H2O2 content and lipid peroxidation i...

OBJECTIVES To determine and evaluate dietary intake of selenium and copper by resident undergraduate students of the University of Ghana. DESIGN Prospective/comparative study. SETTING The university of Ghana, Legon, Accra. SUBJECT One hundred and fifty undergraduate resident students in five out of seven halls of residence of the University of Ghana. MAIN OUTCOME MEASURES Pre-tested str...