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Articoli di riviste sul tema "Selenium"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Zhao, Xiaodan, and Lihao Liao. "Modern Organoselenium Catalysis: Opportunities and Challenges." Synlett 32, no. 13 (2021): 1262–68. http://dx.doi.org/10.1055/a-1506-5532.

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AbstractOrganoselenium catalysis has attracted increasing interest in recent years. This Cluster highlights recent key advances in this area regarding the functionalization of alkenes, alkynes, and arenes by electrophilic selenium catalysis, selenonium salt catalysis, selenium-based chalcogen-bonding catalysis, and Lewis basic selenium catalysis. These achievements might inspire and help future research.1 Introduction2 Electrophilic Selenium Catalysis3 Selenonium Salt Catalysis4 Selenium-Based Chalcogen-Bond Catalysis5 Lewis Basic Selenide Catalysis6 Conclusion

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2

Taskinen, Pekka, Sonja Patana, Petri Kobylin, and Petri Latostenmaa. "Oxidation Mechanism of Copper Selenide." High Temperature Materials and Processes 33, no. 5 (2014): 469–76. http://dx.doi.org/10.1515/htmp-2013-0097.

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AbstractThe oxidation mechanism of copper selenide was investigated at deselenization temperatures of copper refining anode slimes. The isothermal roasting of synthetic, massive copper selenide in flowing oxygen and oxygen – 20% sulfur dioxide mixtures at 450–550 °C indicate that in both atmospheres the mass of Cu2Se increases as a function of time, due to formation of copper selenite as an intermediate product. Copper selenide oxidises to copper oxides without formation of thick copper selenite scales, and a significant fraction of selenium is vaporized as SeO2(g). The oxidation product scale

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3

Kim, Seung Jo, Min Chul Choi, Jong Min Park, and An Sik Chung. "Antitumor Effects of Selenium." International Journal of Molecular Sciences 22, no. 21 (2021): 11844. http://dx.doi.org/10.3390/ijms222111844.

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Functions of selenium are diverse as antioxidant, anti-inflammation, increased immunity, reduced cancer incidence, blocking tumor invasion and metastasis, and further clinical application as treatment with radiation and chemotherapy. These functions of selenium are mostly related to oxidation and reduction mechanisms of selenium metabolites. Hydrogen selenide from selenite, and methylselenol (MSeH) from Se-methylselenocyteine (MSeC) and methylseleninicacid (MSeA) are the most reactive metabolites produced reactive oxygen species (ROS); furthermore, these metabolites may involve in oxidizing su

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4

AVOSCAN, L., H. KHODJA, M. CARRIÈRE, J. COVÈS, and B. GOUGET. "PIXE ANALYSES OF THE SOLUBLE AND MEMBRANE SE-CONTAINING PROTEINS EXTRACTED FROMCUPRIAVIDUS METALLIDURANSCH34 AFTER SELENIUM OXIDES CHALLENGE." International Journal of PIXE 18, no. 03n04 (2008): 91–99. http://dx.doi.org/10.1142/s0129083508001430.

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The soil bacterium Cupriavidus metallidurans CH34 resist selenite by reducing it into the insoluble and less toxic elemental selenium. Two mechanisms of reduction of selenium oxides in C. metallidurans CH34 were highlighted: assimilation leading to organic species and detoxification leading to precipitation of selenite in nanoparticules of elemental selenium. The alkyl selenide detected as an intermediate product during assimilation of selenite or as the major accumulated chemical form during assimilation of selenate was identified as selenomethionine.Soluble and membrane proteins were extract

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5

Poluboyarinov, P. A., D. G. Elistratov, and V. I. Shvets. "METABOLISM AND MECHANISM OF TOXICITY OF SELENIUM-CONTAINING SUPPLEMENTS USED FOR OPTIMIZING HUMAN SELENIUM STATUS." Fine Chemical Technologies 14, no. 1 (2019): 5–24. http://dx.doi.org/10.32362/2410-6593-2019-14-1-5-24.

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The work presents a review devoted to the metabolism and the mechanism of toxicity of seleniumcontaining supplements: elemental selenium, sodium selenite, diacetophenonyl selenide, selenopyrane, ebselen, dimethyl dipyrasolyl selenide and selenium-containing amino acids used for correction of selenium deficiency. Elemental selenium penetrating through cell walls, but not through transport channels demonstrates poorly predicted and difficultly regulated bioavailability. Sodium selenate is known to be the most toxic form of selenium in food. The metabolism of xenobiotic diacetophenonyl selenide r

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6

Ball, Sheila, and John Milne. "Studies on the interaction of selenite and selenium with sulfur donors. Part 3. Sulfite." Canadian Journal of Chemistry 73, no. 5 (1995): 716–24. http://dx.doi.org/10.1139/v95-091.

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Elemental selenium dissolves in sulfite solution to form selenosulfate ion: Se + SO32− = SeSO32−.The formation constants for this equilibrium at temperatures from 0 to 35 °C are reported for the first time. The isomeric thioselenate anion, SSeO32−, is not, however, produced by the reaction of sulfur with selenite nor is the selenoselenate ion, Se2O32−, formed from selenium and selenite. Selenotrithionate is formed rapidly from the reaction of selenous acid with sulfite and hydrogen sulfite according to: HSeO3− + 3 HSO3− = Se(SO3)22− + SO42− + 2H2O.Two isomers of the selenotrithionate ion are o

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7

Danscher, Gorm, and Meredin Stoltenberg. "Zinc-specific Autometallographic In Vivo Selenium Methods: Tracing of Zinc-enriched (ZEN) Terminals, ZEN Pathways, and Pools of Zinc Ions in a Multitude of Other ZEN Cells." Journal of Histochemistry & Cytochemistry 53, no. 2 (2005): 141–53. http://dx.doi.org/10.1369/jhc.4r6460.2005.

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In vivo-applied sodium selenide or sodium selenite causes the appearance of zinc-selenium nanocrystals in places where free or loosely bound zinc ions are present. These nanocrystals can in turn be silver enhanced by autometallographic (AMG) development. The selenium method was introduced in 1982 as a tool for zinc-ion tracing, e.g., in vesicular compartments such as synaptic vesicles of zinc-enriched (ZEN) terminals in the central nervous system, and for visualization of zinc ions in ZEN secretory vesicles of, e.g., somatotrophic cells in the pituitary, zymogene granules in pancreatic acinar

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8

Anderson, Kim A., and Brandon Isaacs. "Determination of Selenium in Feeds, Premixes, Supplements, and Injectable Solutions by Hydride-Generated Inductively Coupled Plasma Atomic Emission Spectrometry." Journal of AOAC INTERNATIONAL 76, no. 4 (1993): 910–13. http://dx.doi.org/10.1093/jaoac/76.4.910.

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Abstract A simple method is described for the determination of 0.01-30 000 μg selenium/g sample. Selenium is present in feed supplements, premixes, mineral mixes, and injectable solution as either selenite or selenate. High concentrations of other common minerals present in these supplements are tolerated by the method. The samples are initially digested by heating with nitric acid and then boiled in a mixture of sulfuric and perchloric acids to convert all selenium species to selenate. The selenate is reduced to selenite, Se (IV), with hydrochloric acid at 95°C. The selenite in turn is then r

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9

Amaratunga, W., O. Chaudry, and J. Milne. "Studies on the interaction of selenite and selenium with sulphur donors. Part 1. 2-Mercaptoethanol." Canadian Journal of Chemistry 72, no. 4 (1994): 1165–70. http://dx.doi.org/10.1139/v94-149.

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Raman spectroscopy and proton and 77Se NMR have been used to show that selenous acid reacts with 2-mercaptoethanol (HOC2H4SH), according to Ganther's reaction (H.E. Ganther, Biochemistry, 7, 2898 (1968)).[Formula: see text]The bis(hydroxyethylthio)selenide decomposes readily in strongly acidic and moderately basic solution to selenium and disulfide,[Formula: see text]Selenium dissolves in excess hydroxyethylmercaptide to give the catenated anion, HOC2H4SSe−[Formula: see text]Air oxidation of this equilibrium mixture yields disulfide and selenium. Formation of the hydroxyethylthioselenide is en

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10

Francisco Sánchez-Viesca and Reina Gómez. "The mechanism of Mecke’s test for opioids." World Journal of Chemical and Pharmaceutical Sciences 2, no. 1 (2023): 023–27. http://dx.doi.org/10.53346/wjcps.2023.2.1.0014.

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Mecke colour test is an official assay for opioids, either for opium or for purified compounds. It employs a solution of selenious acid in sulphuric acid. However, organoselenium chemistry was misunderstood for many years. The reaction mechanism involving selenium (IV) compounds was explained by way of electron back donation, which is a theoretical contravention. In this communication we provide the reactions that take place during this test. Each step is fully commented and the electron flow is given. The reaction proceeds by way of an enol selenite. Acidolysis gives rise to a reduced seleniu

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11

Liu, Simei, Shili Ye, Peng Zhao, and Lihua Zhang. "Synthesis and Preliminary Biological Activity of Selenium Polysaccharides from Tussilago farfara L." Journal of Physics: Conference Series 2706, no. 1 (2024): 012065. http://dx.doi.org/10.1088/1742-6596/2706/1/012065.

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Abstract Tussilago farfara L. selenium polysaccharides (STFPs, similarly hereinafter) were prepared by Selenous acid salt method from Tussilago farfara L. polysaccharide (TFP, similarly hereinafter). Taking the selenium content of STFPs as an indicator, the synthesis process of STFPs was optimized using response surface methodology based on single factor experiments. The optimal synthesis process conditions obtained are: 90 °C, 12 hours, selenide reagent ratio of 1.2: 1, HNO3 volume fraction of 0.7%, and the average selenium content of STFPs measured under these conditions is 2.338 mg/g. Chara

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12

Eom, Taejun, and Anzar Khan. "Selenium-Epoxy ‘Click’ Reaction and Se-Alkylation—Efficient Access to Organo-Selenium and Selenonium Compounds." Chemistry 2, no. 4 (2020): 827–36. http://dx.doi.org/10.3390/chemistry2040054.

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This work establishes the ‘click’ nature of the base-catalyzed oxirane ring opening reaction by the selenolate nucleophile. The ‘click’-generated ß-hydroxy selenide can be alkylated to afford cationic selenium species. Hemolytic studies suggest that selenonium cations do not lyse red blood cells even at high concentrations. Overall, these results indicate the future applicability of the developed organo-selenium chemistry in the preparation of a new class of cationic materials based on the seleno-ether motif.

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13

Jin, Weihong, Cheolho Yoon, Tony Johnston, Seockmo Ku, and Geun Ji. "Production of Selenomethionine-Enriched Bifidobacterium bifidum BGN4 via Sodium Selenite Biocatalysis." Molecules 23, no. 11 (2018): 2860. http://dx.doi.org/10.3390/molecules23112860.

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Selenium is a trace element essential for human health that has received considerable attention due to its nutritional value. Selenium’s bioactivity and toxicity are closely related to its chemical form, and several studies have suggested that the organic form of selenium (i.e., selenomethionine) is more bioavailable and less toxic than its inorganic form (i.e., sodium selenite). Probiotics, especially Bifidobacteriium and Lactobacillus spp., have received increasing attention in recent years, due to their intestinal microbial balancing effects and nutraceutical benefits. Recently, the bioconv

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14

Ramin, A. G., S. Asri-Rezaie, and A. Hajili. "Correlations between Sodium Selenite and Vitamin E with Serum Macro-Minerals in Male Lambs." Folia Veterinaria 66, no. 2 (2022): 70–79. http://dx.doi.org/10.2478/fv-2022-0020.

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Abstract The effects of selenium and vitamin E (Vit. E) were evaluated on the macro-elements and their relationships were also surveyed. Lambs were divided into 4 groups of control, Vit. E, sodium selenite and sodium selenite/Vit. E (Se/E). Sodium selenite (0.1 mg.kg−1) and Vit. E (8 mg.kg−1) were administered. The mean blood selenium was high in sodium selenite. Selenium only in the Se groups was continuously increased. The lowest and highest blood selenium were in Vit. E and sodium selenite, respectively. The mean serum macro-minerals were within the normal range. The trend of calcium and ma

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15

Abduali, Baeshov, Ivanov Nikolay, and Myrzabekov Begzat. "Electrochemical Behavior of Selenium as Part of Composite Electrode in Sulfuric Acid Medium." JOURNAL OF ADVANCES IN CHEMISTRY 7, no. 3 (2011): 1378–84. http://dx.doi.org/10.24297/jac.v7i3.2373.

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The method of productiion of the composite selenium-graphitic electrodes based on organic polymer binder was proposed. Electrochemical behavior of the elementary selenium as content of composite electrode in sulfuric acid medium was assessed. A formation of hydrogen selenide during the cathode polarization, and formation of selenite and selenate ions was shown. An influence of potential spread velocity, acid concentration, and temperature of electrolyte were evaluated. Effective activation power for cathode process was estimated using the temperature-cathodic method.

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16

GLOTOVA, I. A., N. A. GALOCHKINA, V. F. SELEMENEV, O. V. PEREGONCHAYA, and S. A. SOKOLOVA. "IR-SPECTROSCOPIC STUDY OF IMMOBILIZATION OF SELENIUM COMPOUNDS ON BIOMODIFIED COLLAGEN." Periódico Tchê Química 16, no. 33 (2019): 159–68. http://dx.doi.org/10.52571/ptq.v16.n33.2019.174_periodico33_pgs_159_168.pdf.

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The aim of the work was to research the spectral characteristics of collagen substances bioengineered by using complex collagenolytic proteases preparation obtained before and after the immobilization of selenium compounds in acidic and alkaline media and to comparate the degree of interaction of selenium preparations with collagen matrix upon immobilization and its influence on the conformation of protein molecules. The results of the immobilization of selenium preparations on biomodified collagen by the IR spectroscopy method are presented, analyzed, and discussed. Biomodified collagen was o

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17

Müller-Simon, Hayo, and Peter Griebenow. "Behavior of Zinc Selenite, Calcium Selenite and Metallic Selenium as Decolorizing Agents in Flint Glass Production." Advanced Materials Research 39-40 (April 2008): 541–46. http://dx.doi.org/10.4028/www.scientific.net/amr.39-40.541.

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Zinc selenite, calcium selenite and metallic selenium have been consecutively introduced as decolorizing agents in a flint glass production. The selenium concentration in the glass has been measured by wet-chemical analysis, optically by the evaluation of the cielab a-value and electrochemically by means of a voltammetric sensor. All measuring techniques showed the highest selenium retention for calcium selenite followed by zinc selenite and the least retention using metallic selenium. The best reproducibility is achieved using zinc selenite while both calcium selenite and metallic selenium pr

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18

Cemeli, Eduard, Ricard Marcos, and Diana Anderson. "Genotoxic and antigenotoxic properties of selenium compounds in thein vitromicronucleus assay with human whole blood lymphocytes and tk6 lymphoblastoid cells." Scientific World JOURNAL 6 (2006): 1202–10. http://dx.doi.org/10.1100/tsw.2006.204.

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Selenium is known to possess both genotoxic and antigenotoxic properties. In the present study, we have evaluated the genotoxicity and antigenotoxicity of three selenium compounds (sodium selenate, sodium selenite and selenous acid) by measuring in vitro micronucleus induction. Assays were conducted in whole blood lymphocytes and in the TK6 lymphoblastoid cell line, with and without co-treatment with potassium dichromate, a known genotoxic compound. In general, the compounds were more active in TK6 cells than they were in blood lymphocytes. Only 1 μM selenous acid increased the frequency of bi

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19

Shurygina, I. A., N. N. Dremina, I. S. Trukhan, and M. G. Shurygin. "SELENIUM IN NANOFORM: TOXICITY AND SAFETY." Baikal Medical Journal 1, no. 1 (2022): 24–32. http://dx.doi.org/10.57256/2949-0715-2022-1-24-32.

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The review is devoted to the compilation of data on the toxicity and safety of using nanosized forms of selenium. It is shown that in nature selenium exists mainly in the form of selenate (Se6+), selenite (Se4+), selenide (Se2–) and elemen-tal selenium (Se0), while the latter is insoluble in aqueous media, less toxic and biologically inert. Elemental selenium in the form of nanosized particles is not only biocompatible, but also has antitumor and antimicrobial activity. It was shown that elemental selenium in the form of nanoparticles can modulate the activity of the antioxidant and detoxifica

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20

Ranjard, Lionel, Sylvie Nazaret, and Benoit Cournoyer. "Freshwater Bacteria Can Methylate Selenium through the Thiopurine Methyltransferase Pathway." Applied and Environmental Microbiology 69, no. 7 (2003): 3784–90. http://dx.doi.org/10.1128/aem.69.7.3784-3790.2003.

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ABSTRACT Involvement of the bacterial thiopurine methyltransferase (bTPMT) in natural selenium methylation by freshwater was investigated. A freshwater environment that had no known selenium contamination but exhibited reproducible emission of dimethyl selenide (DMSe) or dimethyl diselenide (DMDSe) when it was supplemented with an organic form of selenium [(methyl)selenocysteine] or an inorganic form of selenium (sodium selenite) was used. The distribution of the bTPMT gene (tpm) in the microflora was studied. Freshwater bacteria growing on 10 μM sodium selenite and 10 μM sodium selenate were

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21

Christensen, M. K., C. J. Frederickson, and G. Danscher. "Retrograde tracing of zinc-containing neurons by selenide ions: a survey of seven selenium compounds." Journal of Histochemistry & Cytochemistry 40, no. 4 (1992): 575–79. http://dx.doi.org/10.1177/40.4.1313065.

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The autometallographic retrograde tracing of zinc-containing neurons by intracerebral injection of sodium selenite (Na2SeO3), introduced by Danscher in 1982, has recently been described in more detail. Intracerebral injections of both sodium selenide (Na2Se) and sodium selenite (Na2SeO3) have been successfully used; however, sodium selenite had a rather toxic effect on the injected tissue. In the present study, we tested seven different selenium compounds to find the most suitable compound for retrograde tracing of zinc-positive pathways. Among the tested compounds, sodium selenide (Na2Se) cau

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22

Wen, Su, Yang Hui, and Wang Chuang. "Biosynthesis and antioxidation of nano-selenium using lemon juice as a reducing agent." Green Processing and Synthesis 10, no. 1 (2021): 178–88. http://dx.doi.org/10.1515/gps-2021-0018.

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Abstract Nano-selenium was synthesized using lemon juice as a reducing agent. The experiments showed that pH value affected greatly the shape and the size of the prepared nano-selenium. At pH 9, lemon juice could reduce 50 mmol/L of selenite ions to nano-selenium with particle size between 50 and 90 nm, which was spherical and well dispersed. Lemon juice acted as both a reducing agent and a stabilizer in the synthesis of nano-selenium, in which the chemical interaction between biomolecules and the nano-selenium surface was the basis for the stable existence of nano-selenium. The selenite conce

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23

Yoshinaga, Masafumi, Stephanie How, Damien Blanco, et al. "Directed Evolution of Saccharomyces cerevisiae for Increased Selenium Accumulation." Microorganisms 6, no. 3 (2018): 81. http://dx.doi.org/10.3390/microorganisms6030081.

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Selenium-enriched yeast (selenium yeast) are one of the most popular sources of selenium supplementation used in the agriculture and human nutritional supplements industries. To enhance the production efficiency of selenium yeast, we sought to develop a method to identify, and ultimately select for, strains of yeast with enhanced selenium accumulation capabilities. Selenite resistance of four genetically diverse strains of Saccharomyces cerevisiae was assayed in various conditions, including varying carbon sources, nitrogen sources, and phosphate amounts, and they were correlated with selenium

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Jiang, Xiaoyu, Liu Yang, Yinghui Wang, Fajun Jiang, Junxiang Lai, and Kailin Pan. "Proteomics Provide Insight into the Interaction between Selenite and the Microalgae Dunaliella salina." Processes 11, no. 2 (2023): 563. http://dx.doi.org/10.3390/pr11020563.

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Dunaliella salina is currently one of the most commercially valuable microalgae species in the world. In reponse to selenite, D. salina is a microalgae with a high selenium content, thereby increasing its value, which is crucial for increasing its economic value as a nutrional supplement. However, the effects of selenite on D. salina are still unclear, and its molecular mechanism of the response to selenite stress is also elusive. Here, in order to study the effects of selenite on D. salina and the corresponding regulatory mechanism, we characterized the physiological phenotypes of D. salina u

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Faixová, Zita, Elena Piešová, Zuzana Maková, Klaudia Čobanová, and Štefan Faix. "Effect of dietary supplementation with selenium-enriched yeast or sodium selenite on ruminal enzyme activities and blood chemistry in sheep." Acta Veterinaria Brno 85, no. 2 (2016): 185–94. http://dx.doi.org/10.2754/avb201685020185.

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The experiment was conducted to evaluate the effect of feeding a diet supplemented with different forms of selenium on the rumen fluid, blood and serum enzyme activity and osmotic fragility of red blood cells in sheep. The experiment was carried out on 18 sheep of the Valashka breed at the age of 18 months, divided into 3 groups. The first group was given basal diet (BD) with a Se content of 0.17 mg/kg of dry matter (DM). The second group received BD supplemented with 0.4 mg Se/kg of (DM) in the form of sodium selenite. The third group received BD supplemented with 0.4 mg Se/kg of (DM) in the

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Samra, Kavitej, Mathun Kuganesan, William Smith, et al. "The Pharmacology and Therapeutic Utility of Sodium Hydroselenide." International Journal of Molecular Sciences 22, no. 6 (2021): 3258. http://dx.doi.org/10.3390/ijms22063258.

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Metabolically active gasotransmitters (nitric oxide, carbon monoxide and hydrogen sulfide) are important signalling molecules that show therapeutic utility in oxidative pathologies. The reduced form of selenium, hydrogen selenide (HSe−/H2Se), shares some characteristics with these molecules. The simple selenide salt, sodium hydroselenide (NaHSe) showed significant metabolic activity, dose-dependently decreasing ex vivo O2 consumption (rat soleus muscle, liver) and transiently inhibiting mitochondrial cytochrome C oxidase (liver, heart). Pharmacological manipulation of selenoprotein expression

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Kovalchuk, I. I., A. Z. Pylypets, O. V. Prodanchuk, M. M. Tsap, Y. V. Lesyk, and V. A. Kolotnytskyi. "EFFECT OF SELENIUM CITRATE ON THE LIPID AND PHOSPHOLIPID COMPOSITION OF RABBIT BLOOD PLASMA." Fiziolohichnyĭ zhurnal 71, no. 2 (2025): 58–66. https://doi.org/10.15407/fz71.02.058.

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Selenium (Se) plays a catalytic, structural, and regulatory role in the body, which ensures the functioning of various biological systems and physiological and biochemical reactions. It mitigates oxidative stress and affects the efficiency of fatty acid biosynthesis in animal tissues. The aim of our study was to determine the effect of sodium selenite citrate on lipid and phospholipid composition in the blood plasma of rabbits. White laboratory rabbits were orally administered selenium citrate at a dose of 0.3 mg/kg body weight for 14 days. On the 15th day, animals were euthanized, and blood w

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T, Asmidha, Rajeshkumar S, T. Lakshmi, and Sulochana G. "Free Radical Scavenging Activity of Clove and Cumin Formulation Mediated Selenium Nanoparticl." Journal of Complementary Medicine Research 14, no. 3 (2023): 81. http://dx.doi.org/10.5455/jcmr.2023.14.03.14.

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Background: Selenium nanoparticles (SeNPs) have the potential to be used for various applications.The green SeNPs (selenium nanoparticles) are formed by simple mixing Withania somnifera (W. somnifera) leaves extract and selenious acid (H2SeO3) solution. Nanoparticles have revolutionized for targeted drug delivery by minimizing the toxicity and side effects that commercially available drugs may have on patients. In this study we have chosen the clove and cumin because it protects from cholesterol, inflammatory damage and it has antioxidant property Aim: The aim of the study is to analyze the an

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Eisenberg, Sylvan. "Relative Stability of Selenites and Selenates in Feed Premixes as a Function of Water Activity." Journal of AOAC INTERNATIONAL 90, no. 2 (2007): 349–53. http://dx.doi.org/10.1093/jaoac/90.2.349.

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Abstract Sodium selenite is more hygroscopic than sodium selenate. It is, therefore, more likely to dissolve when dispersed in feeds of relatively high water activity. When dissolved, it may form selenious acid and disperse as a vapor. This is easily demonstrated by mounting a filter paper wetted with a reagent such as ascorbic acid over the subject feed, but not in contact with it. The paper turns brown as elemental selenium is formed from reduction of the vapor. Analysis of the paper ensures that the brown is indeed selenium. Though premixes are generally low enough in moisture content to en

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Kulasekara, Herath Mudiyanselage Ishani P., Yanyan Zhang, and Charalambos Papelis. "Microbial Enhancement of Selenium Removal in Chemically Modified Zeolite Columns." Water 15, no. 10 (2023): 1837. http://dx.doi.org/10.3390/w15101837.

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Selenium (Se) is an essential micro-nutrient for living organisms, but elevated concentrations in water can adversely affect health. In this research, we investigate the removal of selenium oxyanions (selenate and selenite) in aqueous systems by integration of adsorption on modified zeolites and microbial reduction. Dynamic sorption-reduction experiments were conducted using two sets of zeolite columns for the removal of selenite and selenate oxyanions, respectively. In each case, one column was fully packed with natural, unmodified zeolites, while the other column was composed of 80% natural

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Misurova, L., L. Pavlata, A. Pechova, and R. Dvorak. "Effect of a long-term peroral supplementation with sodium selenite and selenium lactate-protein complex on selenium status in goats and their kids." Veterinární Medicína 54, No. 7 (2009): 324–32. http://dx.doi.org/10.17221/107/2009-vetmed.

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The aim of this study was to evaluate the effect of a long-term peroral selenium supplementation in the form of sodium selenite and selenium lactate-protein complex by comparing selenium concentrations and glutathione peroxidase activity in blood of goats and their kids as well as comparing selenium concentrations in goat colostrums. For the study, a total of 27 clinically healthy pregnant white shorthair goats were used. They were divided to three groups, i.e., the control group (C) without any selenium supplementation, sodium selenite group (E1) and selenium lactate-protein complex group (E2

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32

Hurlbut, Jeffrey A., Roger G. Burkepile, and Carolyn A. Geisler. "Colorimetric Determination of Selenium in Premixes and Supplements." Journal of AOAC INTERNATIONAL 75, no. 2 (1992): 269–71. http://dx.doi.org/10.1093/jaoac/75.2.269.

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Abstract A colorimetric method Is described for the determination of 100-10 000 μg selenlum/g premix. Selenium Is present in premixes as either selenite or selenate. Moderate to high concentrations of several common minerals are tolerated. The premix is briefly digested In a sulfuric acid-perchloric acidsodium molybdate mixture, boiled in 10% NaCI solution, made basic, and centrifuged. Aliquots are taken if necessary. The mixture Is then acidified with formic acid, treated with hydroxylamlne hydrochlorlde- EDTA, and complexed with 3,3 - dlamlnobenzldlne. The pH Is adjusted, and an extraction I

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33

Wang, Yidan, Yonghe Yu, Yuhua Duan, et al. "Enhancing the Activity of Carboxymethyl Cellulase Enzyme Using Highly Stable Selenium Nanoparticles Biosynthesized by Bacillus paralicheniformis Y4." Molecules 27, no. 14 (2022): 4585. http://dx.doi.org/10.3390/molecules27144585.

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Abstract (sommario):

The inorganic selenium is absorbed and utilized inefficiently, and the range between toxicity and demand is narrow, so the application is strictly limited. Selenium nanoparticles have higher bioactivity and biosafety properties, including increased antioxidant and anticancer properties. Thus, producing and applying eco-friendly, non-toxic selenium nanoparticles in feed additives is crucial. Bacillus paralicheniformis Y4 was investigated for its potential ability to produce selenium nanoparticles and the activity of carboxymethyl cellulases. The selenium nanoparticles were characterized using z

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34

Bébien, Magali, Gilles Lagniel, Jérôme Garin, Danièle Touati, André Verméglio, and Jean Labarre. "Involvement of Superoxide Dismutases in the Response of Escherichia coli to Selenium Oxides." Journal of Bacteriology 184, no. 6 (2002): 1556–64. http://dx.doi.org/10.1128/jb.184.6.1556-1564.2002.

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Abstract (sommario):

ABSTRACT Selenium can provoke contrasting effects on living organisms. It is an essential trace element, and low concentrations have beneficial effects, such as the reduction of the incidence of cancer. However, higher concentrations of selenium salts can be toxic and mutagenic. The bases for both toxicity and protection are not clearly understood. To provide insights into these mechanisms, we analyzed the proteomic response of Escherichia coli cells to selenate and selenite treatment under aerobic conditions. We identified 23 proteins induced by both oxides and ca. 20 proteins specifically in

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35

Muthu, Arjun, Daniella Sári, Aya Ferroudj, et al. "Microbial-Based Biotechnology: Production and Evaluation of Selenium-Tellurium Nanoalloys." Applied Sciences 13, no. 21 (2023): 11733. http://dx.doi.org/10.3390/app132111733.

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Abstract (sommario):

Using seleno-compounds and telluric compounds is a practical approach for developing solutions against drug-resistant bacterial infections and malignancies. It will accelerate the search for novel treatments or adjuvants for existing therapies. Selenium and tellurium nanospheres can be produced by lactic acid bacteria. The bacteria can differentiate the selenium and tellurium when the medium contains both selenite and tellurite. Therefore, our question in this study was the following: are they making alloys from the selenium and tellurium and what will be the composition, color, and shape of t

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36

Wolter, B., M. Ellis, F. K. McKeith, K. D. Miller, and D. C. Mahan. "Influence of dietary selenium source on growth performance, and carcass and meat quality characteristics in pigs." Canadian Journal of Animal Science 79, no. 1 (1999): 119–21. http://dx.doi.org/10.4141/a98-028.

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Abstract (sommario):

Inorganic (sodium selenite) and organic (selenium-enriched yeast) dietary selenium sources were compared in a performance study using 48 growing–finishing pigs. There was no effect of selenium source on growth and meat-quality traits. The organic selenium source reduced backfat thickness at the last lumbar vertebra, but not at other positions, and increased loin-eye area. Key words: Meat quality, pigs, selenium source

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37

Larionova, Olga Sergeevna, Yaroslav Borisovich Drewko, and Sofia Vladimirovna Gorshunova. "SYNTHESIS OF SELENIUM NANOPARTICLES AND INVESTIGATION OF PHYSIOLOGICAL PROCESSES IN SEEDLINGS OF CUCUMBER OF THE VARIETIES RODNICHOK." SCIENTIFIC LIFE 18, no. 3 (2023): 375–82. http://dx.doi.org/10.35679/1991-9476-2023-18-3-375-382.

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Abstract (sommario):

The effect of growth regulators on physiological processes in cucumber seedlings at the initial stages of ontogenesis was studied. Seeds were analyzed by treatment with 2,6-dimethyl-(4-dimethylaminophenyl)-4n-selenopyran, diacetophenonyl selenide, sodium selenite, selenium nanoparticles, and water; a control experiment was also carried out with a water-alcohol solution. It was found that diacetophenonyl selenide had the greatest stimulating effect on stress resistance of seeds, the accumulation of seedling biomass was 8.7–17.7% more than in the control. The results showed that the increase in

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38

Słupczyńska, Maja, Dorota Jamroz, Janusz Orda, Andrzej Wiliczkiewicz, and Barbara Król. "Long-Term Supplementation of Laying Hen Diets with Various Selenium Sources as a Method for the Fortification of Eggs with Selenium." Journal of Chemistry 2018 (November 13, 2018): 1–7. http://dx.doi.org/10.1155/2018/7986591.

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Abstract (sommario):

The following study focuses on a comparison of the effectiveness of egg content enrichment with selenium (Se) via application of sodium selenite (Na-selenite), selenium-enriched yeast (Se-Yeast), or selenomethionine (Se-Met) in laying hen diets. Two hundred sixteen laying hens were divided into four treatments, each comprising eighteen replications, and each with three hens per cage. Animals were fed a basal diet without Se supplementation (control: selenium content 0.058 mg/kg), with the addition of Na-selenite, Se-Yeast, or Se-Met in amounts equivalent to 0.3 mg/kg of added selenium. The egg

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39

Xu, Mengmeng, Song Zhu, Lingling Wang, et al. "Influence of Selenium Biofortification on the Growth and Bioactive Metabolites of Ganoderma lucidum." Foods 10, no. 8 (2021): 1860. http://dx.doi.org/10.3390/foods10081860.

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Abstract (sommario):

Selenium biofortification of edible and medicinal mushrooms is an effective way to produce selenium-enriched food supplements. Ganoderma lucidum is the typical one with excellent biological activity. This study investigated G. lucidum growth and bioactive metabolites alterations during liquid culture with different concentrations of selenite. Low selenium levels did not affect growth and mycelia morphology, whereas high selenium levels negatively influenced growth, dramatically decreased biomass, caused nucleic acid and protein leakage, damaged cell walls and membranes, and resulted in indicat

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40

Yang, Wenqin, Tingting Jiang, Yaqi Wang, Xiaojing Wang, and Rui Wang. "Combined Transcriptomics and Metabolomics Analysis Reveals the Effect of Selenium Fertilization on Lycium barbarum Fruit." Molecules 28, no. 24 (2023): 8088. http://dx.doi.org/10.3390/molecules28248088.

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Abstract (sommario):

As a beneficial nutrient and essential trace element, selenium plays a significant role in plant growth functions and human protein biosynthesis. Plant selenium enrichment is mainly obtained from both natural soil and exogenous selenium supplementation, while human beings consume selenium-enriched foods for the purposes of selenium supplementation. In this study, different types of selenium fertilizers were sprayed onto Lycium barbarum in Ningxia, and transcriptomics and metabolomics techniques were used to explore the effects of selenium on the fruit differentials and differential genes in Ly

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41

Badgar, Khandsuren, and József Prokisch. "simple method for preparing elemental selenium nano- coating inside a silicone surface." Acta Agraria Debreceniensis, no. 1 (June 1, 2021): 35–43. http://dx.doi.org/10.34101/actaagrar/1/8940.

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Abstract (sommario):

Selenium nanoparticles (SeNPs) with a bright red colour have aroused worldwide attention due to their unique properties in selenium supplementation because of their low toxicity and favourable bioavailability. A simple method was developed for making a red selenium nanolayer on the inner surface of Polyvinyl chloride (PVC) and silicone tube. The selenium nanoparticles were produced by the reaction of sodium selenite and ascorbic acid. Red amorphous selenium nanoparticles have been successfully synthesized by the reaction of 500 mg dm-3 Se (sodium selenite) solution with 10 g dm-3 ascorbic acid

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42

Pechová, A., AntošováL, L. Pavlata, and A. Podhorský. "Effect of sodium selenite or lactate-protein selenium complex supplementation on selenium status in goat kids." Czech Journal of Animal Science 60, No. 1 (2016): 16–24. http://dx.doi.org/10.17221/7907-cjas.

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43

Suzuki, Kazuo T., Chiaki Doi, and Noriyuki Suzuki. "Simultaneous tracing of multiple precursors each labeled with a different homo-elemental isotope by speciation analysis: Distribution and metabolism of four parenteral selenium sources." Pure and Applied Chemistry 80, no. 12 (2008): 2699–713. http://dx.doi.org/10.1351/pac200880122699.

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Abstract (sommario):

The availability, distribution, and metabolism of four typical selenium sources [inorganic selenite and selenate, and organic selenomethionine (SeMet) and methylselenocysteine (MeSeCys)] were compared by administering them simultaneously through a parenteral route. The four selenium sources were each labeled with a different enriched selenium isotope (82Se, 78Se, 77Se, and 76Se, respectively), and administered intravenously at the dose of 25 μg Se/kg body weight each to rats that had been depleted of natural abundance selenium with a single isotope, 80Se, by feeding 80Se-selenite in drinking w

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44

Sun, Na Xin, Gui Xiang Zhang, Yue Hui Liu, and Yuan Xiu Wang. "Optimization of Selenium Yeild by Saccharomyces sp. III Using Statistical Designs." Advanced Materials Research 781-784 (September 2013): 1278–83. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.1278.

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Abstract (sommario):

The objective of the study was to optimize the conditions in a culture medium for the selenium yeild enriched by Saccharomyces sp. III using Plackett-Burman design and Box-Behnken design. The Plackett-Burman multifactorial design was first employed to screen the significant factors in the fermentation for the selenium yeild, and subsequent use of the response surface methodology was further optimized for the selenium yeild by Box-Behnken design. The important factors in the culture medium, identified by the initial screening method of Placket-Burman, were sodium selenite, glucose and the liqui

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45

Peng, Mu, Guangai Deng, Chongyang Hu, Xue Hou, and Zhiyong Wang. "Bioremediation Potential of Rhodococcus qingshengii PM1 in Sodium Selenite-Contaminated Soil and Its Impact on Microbial Community Assembly." Microorganisms 12, no. 12 (2024): 2458. http://dx.doi.org/10.3390/microorganisms12122458.

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Abstract (sommario):

Soil microbial communities are particularly sensitive to selenium contamination, which has seriously affected the stability of soil ecological environment and function. In this study, we applied high-throughput 16S rRNA gene sequencing to examine the effects of low and high doses of sodium selenite and the selenite-degrading bacterium, Rhodococcus qingshengii PM1, on soil bacterial community composition, diversity, and assembly processes under controlled laboratory conditions. Our results indicated that sodium selenite and strain PM1 were key predictors of bacterial community structure in sele

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46

Matvyeyeva, Svetlana. "Influence of compensation of selenium deficiency on immunological parameters of patients with multidrugresistant tuberculosis at the background of subclinical hypothyroidism." Bulletin of the Academy of Sciences of Moldova. Medical Sciences 71, no. 3 (2022): 242–44. http://dx.doi.org/10.52692/1857-0011.2021.3-71.20.

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Abstract (sommario):

In 60 patients with multidrug-resistant tuberculosis at the background of subclinical hypothyroidism serum level of selenium, thyroid state and immunological parameters were studied in dynamic of the intensive phase of chemotherapy. Initially low level of selenium, subclinical hypothyroidism and weaken immunological response toward tuberculosis were diagnosed. Prescribing of selenite sodium with 200 μ daily during 60 daily doses normalized serum level of selenium, restored thyroid function and improved immunological response. Using of selenite sodium like an accompanying medicine during chemot

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47

Neves, Ellen Gaby, Flavia Maria de Moraes Ramos-Perez, Deborah Queiroz Freitas, Frab Norberto Boscolo, and Solange Maria Almeida. "Radioprotective Effect of Sodium Selenite on Developing Teeth." Brazilian Dental Journal 24, no. 4 (2013): 375–79. http://dx.doi.org/10.1590/0103-6440201302193.

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Abstract (sommario):

Radioprotective agents like selenium are used to reduce the damage caused by radiation in healthy tissues. The aim of this study was to evaluate the effect of sodium selenite on the development of the molars of offspring of rats irradiated during odontogenesis. Twenty pregnant rats were randomly divided into 4 groups: control, irradiated, selenium and selenium/irradiated. The selenium and selenium/irradiated groups received 0.3 mg/kg of sodium selenite at 18 days of pregnancy. The rats of the irradiated and selenium/irradiated groups received a single dose of 4 Gy of X rays on the abdominal re

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48

Shi, Chen-Yang, Yin-Chin Hew, and Choon-Nam Ong. "Inhibition of aflatoxin B1-induced cell injury by selenium: an in vitro study." Human & Experimental Toxicology 14, no. 1 (1995): 55–60. http://dx.doi.org/10.1177/096032719501400111.

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Abstract (sommario):

Dietary selenium is an essential trace element in human nutrition. Selenium has been shown in animal studies to inhibit aflatoxin hepatocarcinogenesis. However, the cellu lar mechanism responsible for the inhibition has not been thoroughly studied. This study examines the effect of two selenium compounds, namely, sodium selenite and selenium- enriched yeast extract (SeY), on the cytotoxicity, DNA- binding and mutagenicity of aflatoxin B1 (AFB1) in cul tured Chinese hamster ovary (CHO) cells. CHO cells, after treatment with 2 μg ml-1 selenite or 80 μg ml-1 SeY, exhibit ed increased resistance t

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49

Butler, Clive S., Charles M. Debieux, Elizabeth J. Dridge, Peter Splatt, and Matthew Wright. "Biomineralization of selenium by the selenate-respiring bacterium Thauera selenatis." Biochemical Society Transactions 40, no. 6 (2012): 1239–43. http://dx.doi.org/10.1042/bst20120087.

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Abstract (sommario):

Bacterial anaerobic respiration using selenium oxyanions as the sole electron acceptor primarily result in the precipitation of selenium biominerals observed as either intracellular or extracellular selenium deposits. Although a better understanding of the enzymology of bacterial selenate reduction is emerging, the processes by which the selenium nanospheres are constructed, and in some cases secreted, has remained poorly studied. Thauera selenatis is a Gram-negative betaproteobacterium that is capable of respiring selenate due to the presence of a periplasmic selenate reductase (SerABC). SerA

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50

Maia, Luisa B., Biplab K. Maiti, Isabel Moura, and José J. G. Moura. "Selenium—More than Just a Fortuitous Sulfur Substitute in Redox Biology." Molecules 29, no. 1 (2023): 120. http://dx.doi.org/10.3390/molecules29010120.

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Abstract (sommario):

Living organisms use selenium mainly in the form of selenocysteine in the active site of oxidoreductases. Here, selenium’s unique chemistry is believed to modulate the reaction mechanism and enhance the catalytic efficiency of specific enzymes in ways not achievable with a sulfur-containing cysteine. However, despite the fact that selenium/sulfur have different physicochemical properties, several selenoproteins have fully functional cysteine-containing homologues and some organisms do not use selenocysteine at all. In this review, selected selenocysteine-containing proteins will be discussed t

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