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      Efficient Reduction of Selenite to Elemental Selenium by Liquid-Phase Catalytic Hydrogenation Using a Highly Stable Multiwalled Carbon Nanotube-Supported Pt Catalyst Coated by N-Doped Carbon

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          Mechanisms of catalyst deactivation

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            Heterogeneous Catalyst Deactivation and Regeneration: A Review

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              Selenium in the Environment, Metabolism and Involvement in Body Functions

              Selenium () is a metalloid which is close to sulfur (S) in terms of properties. The Se concentration in soil varies with type, texture and organic matter content of the soil and with rainfall. Its assimilation by plants is influenced by the physico-chemical properties of the soil (redox status, pH and microbial activity). The presence of Se in the atmosphere is linked to natural and anthropogenic activities. Selenoproteins, in which selenium is present as selenocysteine, present an important role in many body functions, such as antioxidant defense and the formation of thyroid hormones. Some selenoprotein metabolites play a role in cancer prevention. In the immune system, selenium stimulates antibody formation and activity of helper T cells, cytotoxic T cells and Natural Killer (NK) cells. The mechanisms of intestinal absorption of selenium differ depending on the chemical form of the element. Selenium is mainly absorbed in the duodenum and caecum by active transport through a sodium pump. The recommended daily intake of selenium varies from 60 μg/day for women, to 70 μg/day for men. In growing ruminants the requirements are estimated at 100 μg/kg dry matter and 200 μg/Kg for pregnant or lactating females. A deficiency can cause reproductive disorders in humans and animals.
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                Author and article information

                Contributors
                Journal
                ACS Applied Materials & Interfaces
                ACS Appl. Mater. Interfaces
                American Chemical Society (ACS)
                1944-8244
                1944-8252
                June 30 2021
                June 16 2021
                June 30 2021
                : 13
                : 25
                : 29541-29550
                Affiliations
                [1 ]State Key Laboratory of Pollution Control and Resource Reuse/School of the Environment, Nanjing University, Nanjing, Jiangsu 210046, China
                [2 ]Department of Civil and Environmental Engineering, Rice University, Houston, Texas 77005, United States
                Article
                10.1021/acsami.1c05101
                a030b4b9-c421-4563-937c-705a0cc43fa0
                © 2021
                History

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