In the presence of ATP and Mg2+, ATP sulphurylase from Saccharomyces cerevisiae catalysed the conversion of selenate into a compound with the electrophoretic and acid-lability properties of adenosine 5'-sulphatophosphate. Structural characterization, involving extensive purification of adenosine 5'-selenophosphate, proved impossible. However, we showed ATP-, Mg2+- and ATP sulphurylase-dependent...

1. ATP sulphurylases were partially purified (20-40-fold) from leaf tissue of Astragalus bisulcatus, Astragalus racemosus (selenium-accumulator species) and Astragalus hamosus and Astragalus sinicus (non-accumulator species). Activity was measured by sulphate-dependent PP(i)-ATP exchange. The enzymes were separated from pyrophosphatase and adenosine triphosphatase activities. The properties of ...

This experiment was conducted to evaluate and compare the effects of inorganic organic selenium sources with carriers on growth performance, starter feed intake, blood parameters, concentration glutathione peroxidase in suckling Holstein calves. To this objective, 40 calves (38.47±2.52 kg average birth weight) at 7 days age were selected randomly divided into four experimental groups (10 replic...

Sorption processes at the mineral/water interface typically control the mobility and bioaccessibility of many inorganic contaminants such as oxyanions. Selenium is an important micronutrient for human and animal health, but at elevated concentrations selenium toxicity is a concern. The objective of this study was to determine the bonding mechanisms of selenate (SeO4(2-) and selenite (SeO3(2-) o...

doi: 10.1111/j.1399-3054.2006.00739.x To investigate selenium tolerance mechanisms in Arabidopsis thaliana, genetic and physiologic studies were performed in the three Arabidopsis accessions Landsberg erecta (Ler), Columbia (Col) and Wassilewskija (Ws). Accession Ler was significantly less tolerant to selenate than Ws and Col, whereas Ws was less tolerant to selenite than the others. Analysis o...

The weathering of selenium-rich rocks or anthropogenic activities such as mining smelting can release selenium into the environment, posing a significant environmental risk. increased monitoring and enforcement regulations have resulted in protocols to efficiently measure treat water effluent water. principal aqueous forms inorganic are selenite (Se(IV)) selenate (Se(VI)). Selenate, due its oxy...

Korean ginseng (Panax ginseng C.A. Meyer) was tested to demonstrate that production of this plant with a nutritionally important selenium (Se) is possible, making it a functional ginseng with concentrated Se supplement and the Se incorporated into the enriched Korean ginseng occurs in a soluble, metabolically available form. Sequential extraction was used to assess the degree of solubility of S...