نتایج جستجو برای: zinc and copper removal
تعداد نتایج: 16882447 فیلتر نتایج به سال:
For decades it has been debated whether the conversion of synthesis gas to methanol over copper catalysts is sensitive or insensitive to the structure of the copper surface. Here we have systematically investigated the effect of the copper particle size in the range where changes in surface structure occur, that is, below 10 nm, for catalysts with and without zinc promotor at industrially relev...
Zinc and copper have important effects on T cell mediated immunity and on neutrophil function, but it is not known how the causes or effects, of low serum zinc and high serum copper relate to the clinical picture of rheumatoid arthritis (RA). In this study serum zinc and copper determined by flame atomic absorption spectrometry and 30 other clinical, immunological, and laboratory parameters in ...
We determined zinc, copper, magnesium, and calcium concentrations by atomic absorption spectrophotometry in the plasma of 30 patients hospitalized for treatment of seizures during a period of alcohol withdrawal. Those patients who developed delirium tremens or a prolonged hallucinatory state had significantly higher plasma copper concentrations (P = 0.026), significantly lower zinc concentratio...
Due to the important role of the trace elements (i.e. zinc and copper) in the biochemical processes of body and the effects of exogenous and endogenous hormones in distribution, absorption and excretion of these elements, we decided to determine the rate of the zinc and copper content of serum in women taking (LD) OCPs. Our finding indicates that the rate of the zinc content decreased significa...
Background and Aim: Inappropriate diet and patterns of consumption and inadequate intake of nutrients among young people, e.g students can cause different diseases. Regarding that the studies done on the youth are very few in Iran, the present study was performed with the aim of assessing nutritional status and zinc, iron and copper serum concentration in University students and the relationshi...
Sediments play an effective role in pollution control or water purification of the wetland ecosystem and record heavy metals contamination as an historical archive. Ganduman wetland is one of the top 10 birdwatching wetlands in Iran. This study aimed to to investigate the concentration of lead, cadmium, copper and zinc in Ganduman sediments. For this purpose, sediment samples were collected man...
Pityriasis Alba is an eruptive skin disorder which occurs as dry hypopigmented , scaly patches appears mainly in sun expose areas of skin, usually in children and young adolescents. Complete cure occurs within few years even without treatment. Few trace elements play essential roles as cofactors in pigmentary process of the skin. In this study by determination of zinc and copper levels in...
BACKGROUND It is well known that some trace elements such as zinc and copper play a significant role in many forms of hair loss. However, the effect of zinc and copper in the pathogenesis of hair loss is still unknown. OBJECTIVE The purpose of this study is to evaluate the zinc and copper status in each of four types of hair loss. METHODS A study was carried out with 30 health controls and ...
An extremely sensitive pulse polarographic method for the determination of zinc dimethyldithiocarbamate (an agricultural fungicide) and zinc di-n-pentyldithiocarbamate (a petroleum additive), has been developed based on the reaction of their dithiocarbamate moiety with copper(II) perchlorate in acetonitrile medium. Well defined diffusion-controlled peaks are observed at –140 mV and –130 mV (vs ...
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