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Letteratura scientifica selezionata sul tema "Selenium compounds"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 6 settembre 2023

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Articoli di riviste sul tema "Selenium compounds"

Christensen, M. K., C. J. Frederickson e G. Danscher. "Retrograde tracing of zinc-containing neurons by selenide ions: a survey of seven selenium compounds." Journal of Histochemistry & Cytochemistry 40, n. 4 (aprile 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) caused insignificant necrosis within the injection site and was easily transported retrogradely when handled anaerobically. Sodium selenide is therefore recommended as the compound of choice.

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Cemeli, Eduard, Ricard Marcos e 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 binucleated cells containing micronuclei (BNMN) in blood lymphocytes, while all three selenium compounds increased BNMN in TK6 cells. In addition, combinations of selenous acid and potassium dichromate resulted in lower frequencies of BNMN than potassium dichromate alone in blood lymphocytes, while combinations of sodium selenate and potassium dichromate produced lower frequencies of BNMN than potassium dichromate alone in TK6 cells. The concentrations of selenium compounds that were used, in combination with the medium components and the biological physiology of the whole blood lymphocytes and TK6 cells, could have affected the redox potential of the compounds, switching the chemicals from a pro-oxidant to antioxidant status and vice-versa. The lower activities of the compounds in blood lymphocytes may be due to the protective effects of blood components. The results indicate that the genotoxic and antigenotoxic properties of selenium compounds are highly dependent upon the conditions under which they are evaluated.

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Francisco Sánchez-Viesca e Reina Gómez. "The mechanism of Mecke’s test for opioids". World Journal of Chemical and Pharmaceutical Sciences 2, n. 1 (30 gennaio 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 selenium (II) intermediate and an activated ketone at C-2, that is, a redox reaction with polarity inversion. Addition of selenious acid and further electron shifts affords morphine ortho-quinone and elemental selenium.

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GLOTOVA, I. A., N. A. GALOCHKINA, V. F. SELEMENEV, O. V. PEREGONCHAYA e S. A. SOKOLOVA. "IR-SPECTROSCOPIC STUDY OF IMMOBILIZATION OF SELENIUM COMPOUNDS ON BIOMODIFIED COLLAGEN". Periódico Tchê Química 16, n. 33 (20 marzo 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 obtained from beef trimming waste (veins and tendons) by sequential peroxide-alkaline and enzymatic hydrolysis with the food collagenase preparation. The following sources of selenium were used as compounds with bioprotective properties for subsequent immobilization on biomodified collagen proteins: 4,4-di[3(5-methyldiprazolil)]selenide (DMDPS) with the content of 0,657g DMDMS in 100 cm3 and sodium selenite. Spectrograms are carried out for products of biomodification of collagen before sorption of compounds of selenium, (at the rate of 1.2 g-6 of selenium on 1 g of collagen) in acid (рН =5) and alkaline (рН =10) environments at a research of influence of compounds of selenium on IR spectrums of products of biomodification of collagen. It was established, that the immobilization takes place by a chemical reaction of selenium preparations with functional groups of the side chains of protein molecules, and its degree varies in the range Na2SeO3 (pH=5) > 4,4-di[3(5-methyldiprazolil)]selenide (DMDPS) > Na2SeO3 (pH=10). It is shown that under the interaction of selenium products with collagen, there is no change in the conformations of its molecules occurred.

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Eom, Taejun, e Anzar Khan. "Selenium-Epoxy ‘Click’ Reaction and Se-Alkylation—Efficient Access to Organo-Selenium and Selenonium Compounds". Chemistry 2, n. 4 (5 ottobre 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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Nevitov, Mikhail, Aleksandr Ostapchuk, Pavel Poluboyarinov, Aleksey Gamayunov, Polina Anipchenko, Anatoly Stekolnikov, Kirill Plemyashov et al. "PSVI-33 Queen bees’ artificial breeding using selenium compounds". Journal of Animal Science 97, Supplement_3 (dicembre 2019): 205–6. http://dx.doi.org/10.1093/jas/skz258.423.

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Abstract The aim of the study was to research the effect of selenium-containing drugs on the efficiency of artificial hatching, using them in the composition of feeding of starter-families. The experiment was conducted in a private apiary located in the Penza region, Russia (30 bee colonies). The predominant honey plants - melilot, rose bay. The average productivity -65–70 kg of marketable honey.In the maternal family, 1.5-day-old larvae were taken, transferred to artificial pans and placed for a day in the family-starters, and then - in the queen-rearing colony. Families-starters once received a sugar syrup with selenium-containing drugs. Sugar syrup(S) was prepared in a 1: 1 ratio, selenium drugs were added to it. The introduction of selenopyran as part of top-dressing to the starter-family at a dose of 0.2 mg of selenium per 1 kg of bees causes an increase in selenium content in the body of bees by 138%, while the administration of sodium selenite and selenocystin does not lead to significant changes in the selenium status of insects under the same conditions.Sodium selenite, introduced as part of top-dressing to the family-starter up to 0.2 mg selenium per 1 kg of bee mass, increases the selenium content in the body of the queens that were in the 1st day of development in this family by 225%, while selenopyran with this method administration causes an increase in selenium level in the body of the uterus by 121%, and selenocystin - by 73%, compared with the control.The use of selenocystine and sodium selenite as part of feeding to starter families contributes to better preservation of the larvae in the development process in queen-rearing colony, compared with the control and provides a higher yield of queens (respectively, 214% and 157% higher).

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Garayev, A. M., e A. B. Rzayeva. "SOLVOTHERMAL SYNTHESIS OF TRIPLE NANO COMPOUNDS BISBSE3 IN A LIQUID PHASE". EurasianUnionScientists 5, n. 7(76) (20 agosto 2020): 68–72. http://dx.doi.org/10.31618/esu.2413-9335.2020.5.76.931.

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Ternary compounds of bismuth antimony selenide have been synthesized under solvothermal conditions in ethylene glycol medium at the temperature of 453-463 K during 15 hours from bismuth (III) oxide, antimony (III) oxide, elemental selenium (amorph) and hydrazine monohydrate. At a temperature of 453-463 K, after a 15-hour synthesis, a flocculent precipitate is obtained. The thermographic, differential thermal (DTA), X-ray (XRD), chemical, and morphological analyses of the compound were performed and it was found that the crystals of the compound are presented in the form of nano and micro-shelves. The results showed that the composition of selenium compounds of antimony bismuth corresponds to the BiSbSe3 formulas

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Swearingen, J. W., D. E. Fuentes, M. A. Araya, M. F. Plishker, C. P. Saavedra, T. G. Chasteen e C. C. Vásquez. "Expression of the ubiE Gene of Geobacillus stearothermophilus V in Escherichia coli K-12 Mediates the Evolution of Selenium Compounds into the Headspace of Selenite- and Selenate-Amended Cultures". Applied and Environmental Microbiology 72, n. 1 (gennaio 2006): 963–67. http://dx.doi.org/10.1128/aem.72.1.963-967.2006.

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ABSTRACT The ubiE gene of Geobacillus stearothermophilus V, with its own promoter, was cloned and introduced into Escherichia coli. The cloned gene complemented the ubiE gene deficiency of E. coli AN70. In addition, the expression of this gene in E. coli JM109 resulted in the evolution of volatile selenium compounds when these cells were grown in selenite- or selenate-amended media. These compounds were dimethyl selenide and dimethyl diselenide.

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Mal’tseva, Valentina N., Michael V. Goltyaev, Egor A. Turovsky e Elena G. Varlamova. "Immunomodulatory and Anti-Inflammatory Properties of Selenium-Containing Agents: Their Role in the Regulation of Defense Mechanisms against COVID-19". International Journal of Molecular Sciences 23, n. 4 (21 febbraio 2022): 2360. http://dx.doi.org/10.3390/ijms23042360.

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The review presents the latest data on the role of selenium-containing agents in the regulation of diseases of the immune system. We mainly considered the contributions of selenium-containing compounds such as sodium selenite, methylseleninic acid, selenomethionine, and methylselenocysteine, as well as selenoproteins and selenium nanoparticles in the regulation of defense mechanisms against various viral infections, including coronavirus infection (COVID-19). A complete description of the available data for each of the above selenium compounds and the mechanisms underlying the regulation of immune processes with the active participation of these selenium agents, as well as their therapeutic and pharmacological potential, is presented. The main purpose of this review is to systematize the available information, supplemented by data obtained in our laboratory, on the important role of selenium compounds in all of these processes. In addition, the presented information makes it possible to understand the key differences in the mechanisms of action of these compounds, depending on their chemical and physical properties, which is important for obtaining a holistic picture and prospects for creating drugs based on them.

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Bandura, Laura, Justyna Drukala, Agnieszka Wolnicka-Glubisz, Mikael Björnstedt e Wlodzimierz Korohoda. "Differential effects of selenite and selenate on human melanocytes, keratinocytes, and melanoma cells". Biochemistry and Cell Biology 83, n. 2 (1 aprile 2005): 196–211. http://dx.doi.org/10.1139/o04-130.

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Among the substances that attracted the attention of oncologists in recent years are selenium-containing compounds, both inorganic and organic. Several epidemiological studies have shown an inverse correlation between selenium intake and cancer incidence. In the experiments reported here, we compared the effects of 2 inorganic selenium- containing salts that differed in the level of selenium oxidation, selenite IV and selenate VI. We tested the effects of these 2 compounds on cell survival and growth, cell cycle processing, cell morphology, cytoskeleton, and lipid peroxidation in 3 human skin cell types: normal keratinocytes, melanocytes, and human melanoma cell line HTB140. The different effects of selenite and selenate on the viability, growth, and morphology of normal cells and tumor cells are reported and provide a base for future research and treatment of some neoplastic diseases. The attention is paid to cell apoptosis induced by selenite and not by selenate, and the effects of tested substances on thioredoxin reductase system are postulated.Key words: selenium, cell viability and growth, apoptosis, lipid oxidation, thioredixin reductase system, human skin cells, human melanoma.

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Tesi sul tema "Selenium compounds"

Bates, C. M. "Pentamethylcyclopentadienyl (Cp*) compounds of selenium and tellurium". Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636056.

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Successful preparations were: (1) bis(pentamethylcyclopentadienyl)selenium, prepared by the reaction of selenium diethydithiocarbamate with lithiated pentamethylcyclopentadiene; (2) Cp*Se_nLi (n = 2,3,4), prepared by the reaction of elemental selenium with lithiated pentamethylcyclopentadiene in THF and its subsequent reaction with iodomethane to produce (3) methyl(pentamethylcyclopentadienyl)selenium or water to produce the polyselenide mixture (4) Cp*₂Se_n (n = 2,3,4). (4) was also produced by the low temperature reaction of selenium chloride with lithiated pentamethylcyclopentadiene. The compounds were characterised by conventional methods including ⁷⁷Se NMR spectroscopy. The x-ray structural determination was obtained for compound (1) revealing the largest C-Se-C bond angle recorded for a simple diorganoselenide. The reactivities of the compounds (1) (3) and (4) were investigated in reactions with unsaturated transition metal fragments. In the reactions of (1) with sources of the tungsten and chromium carbonyl compounds [W(CO)₅THF], [W(CO)₃(CH₃CN)₃], [Cr(CO)₅THF], [Cr(CO)₄nbd] and [Cr(CO)₃(CH₃CN)₃] the first example of reduction of a selenide to form a diselenide within the transition metal coordination sphere was observed. These produced the complexes [M(CO)₂{Se₂Cp*₂}] (M = W, Cr). The x-ray structure determinations are included. These complexes contain the longest Se-C bonds recorded. A 1,2 metal shift was observed for the tungsten complex using the technique of two dimensional exchange NMR spectroscopy. (3) reacts with [W(CO₅THF] or [Cr(CO)₅THF] to produce the complexes [W(CO)₅{Se(Me)Cp*}] and [Cr(CO)₅{Se(Me)Cp*}]. The first recorded Se-W satellites are reported for the former. The compounds (1), (3) and (4) were reacted with diiron nonacarbonyl to produce the complex [Fe₃Se₂(CO)₅]. Compound (1) was reacted with a half molar equivalent of [PdCl₂(PhCN)₂] to produce the complex [Pd₂Cl₄(SeCp*₂)].

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Carroll, Luke Dean. "Modulation of oxidative damage by selenium compounds". Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14124.

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Myeloperoxidase (MPO) is the primary enzyme responsible for the production of strong oxidants by neutrophils in response to pathogens. One of the major oxidants produced is hypochlorous acid (HOCl), which can react with amine groups to form the secondary oxidants N-chloramines. These oxidants play a role in the destruction of pathogens, however they also have the potential to damage host cells, and have been implicated in numerous inflammatory diseases. This Thesis explores the potential for selenium containing compounds and enzymes to act as catalytic oxidant scavengers. Reaction rates between MPO-derived oxidants and selenium compounds were determined product characterization of products performed. The reduction of the oxidised products, selenoxides, was examined and the rate constant for the thiol reduction of selenoxides determined. It is demonstrated that selenium and sulfur containing enzymes are capable of scavenging these oxidants, as well as reversing the formation of selenoxides. The ability of selenium compounds to protect against damage induced by treatment of cells with HOCl and N-chloramines was also assessed. Overall, selenium containing compounds and enzymes show potential in scavenging these oxidants with endogenous thiols capable of reversing the oxidised selenium products, making them a potential therapeutic intervention in inflammatory conditions.

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Meng, Shuang. "Heteroepitaxial growth of gallium selenium compounds on silicon /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/9749.

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Braude, Jeremy. "Organic Selenium Compounds as Oxidants in Cancer Therapy". Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424584.

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Chiu, Winnie Wai Hang. "Metal complexes with sulfur and selenium donor ligands /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202009%20CHIU.

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Cooney, Rita A. "Speciation and identification of selenium compounds in biological matrices". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/30258.

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Tan, Thatt Yang Timothy School of Chemical Engineering &amp Industrial Chemistry UNSW. "Photocatalytic reduction of selenate and selenite : water/wastewater treatment and the formation of nano-selenium compounds". Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2003. http://handle.unsw.edu.au/1959.4/20448.

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The current work investigates the photocatalytic reduction of selenium (Se) ions, selenate Se(VI) and selenite Se(IV), from two perspectives: Se ion removal from water and wastewater and the formation of nano-Se compounds. Se ion pollution has become an environmental issue in recent years, and hence there is an urgent need for an efficient removal technique. In addition, there is increasing interest in the formation of nano-size semiconductors for niche applications. Since Se is a semiconductor, its formation onto the semiconductor TiO2 could lead to the discovery of new composite materials. The current study has successfully elucidated the mechanism of Se ions reduction by photocatalysis. Factors such as the simultaneous adsorption of the Se ions (the electron scavenger in this case) and a suitable organic compound (the hole scavenger), and the chemical properties of the hole scavenger were crucial for effective and efficient Se ions photoreduction. Optimum conditions in relation to pH, concentrations and types of hole scavenger were reported and discussed. It was also found that stoichiometric adsorption ratio of formate and selenate resulted to optimum photoreduction rate. A modified Langmuir-Hinshelwood kinetic model that considered the simultaneous adsorption of both solutes was derived. The current investigation has also seen the successful formation Se deposits of different morphologies onto the TiO2 particles. Discrete Se particles of various sizes in the nano-size range as well as a Se film were deposited onto the TiO2 particles under different initial experimental conditions. The Se-TiO2 composite semiconductor was explored for the removal of cadmium Cd2+ ions, which resulted in the formation of CdSe-TiO2 systems. The photoreduction of Se ions using silver-modified TiO2 showed the enhanced reduction of Se ions to Se2- in the form of H2Se gas. It is suggested that the H2Se gas generated from the current photoreduction process could be used as a safer and cheaper technique in the formation of Se-compounds such copper selenide, cadmium selenide and zinc selenide. All these compounds were widely used in optical and semiconducting devices.

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Du, Junyi. "X-ray crystallographic studies of sulfur/selenium heteroatom compounds". Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/8984.

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The major aim of research reported on this thesis uses X-ray crystallography to investigate the structural features of a series of pentafluorosulfuranyl (SF₅) containing aromatic compounds, chalcogen amides, 2,4-diaryl-1,3-selenazoles and 2,4-diaryl-1,3-chalcogen azoles bearing SF₅ group and organo phosphorus-chalcogen macrocycles incorporationg double OP(S)SC[sub]n or OP(Se)SeC[sub]n scaffolds. The basic theory of crystallography is introduced in Chapter 1, followed by a general discussion on pentafluorosulfuranyl (SF₅) containing heteroatom compounds and sulfur/selenium heterocycles in Chapter 2. Ten pentafluorosulfuranyl (SF₅)-containing aromatic compounds have been studied crystallographically in Chapter 3. All S-F bond lengths in these compounds are very similar [1.571(3) to 1.618(3) Å and 178.5(3) to 180.0° for the C-S-F(ax) bond] and the angles of two adjacent F(eq) is approximate to 90°. The intramolecular C[sub](aryl)-H···F(eq) and intermolecular C[sub](aryl)-H···O/N/F/Cl interactions, and π-stacking interactions are observed in the packing frameworks. X-ray crystal structure analysis reveals that in the structures of 2,4-diaryl-1,3-selenazoles in Chapter 4, the five-membered N-C-Se-C-C rings have either planar or near-planar conformations, and exhibit a series of the intramolecular and intermolecular C-H∙∙∙O/N/Se/Br/Cl) interactions and π-stacking interactions. The crystal structures of 2,4-diaryl-1,3-chalcogen azoles with both a pentafluorosulfuranyl (SF₅) group and a five-membered N-C-Se-C-C ring have been investigated in Chapter 5. A diverse picture of molecular configuration and intramolecular/intermolecular C-H∙∙∙N/Se/S and π-stacking interactions information are disclosed in selenamide, thiamides, 1,3-selenazoles and 1,3-thiazoles. Nine organo phosphorus-chalcogen macrocycles with nine- to fifteen-membered ring incorporating double OP(S)SC[sub]n or OP(Se)SeC[sub]n scaffolds have been discussed crystallographically in Chapter 6. The similar intramolecular and intermolecular C-H∙∙∙O, C-H∙∙∙S or C-H∙∙∙Se interactions are observed to lead to the similar packing networks.

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Robey, Stephanie. "Reactions of Platinum(II) Compounds with Selenium Containing Amino Acids". TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1252.

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Platinum(II) anticancer medications essentially react with DNA forming kinks inthe double helix of DNA and causing apoptosis. It has also been noted that theseanticancer medications react with methionine and cysteine in the body. With the new discoveries of selenium containing amino acids including selenomethionine and selenocysteine, new research is ongoing to see what types of products can be formed from these amino acids. Our research reacts [Pt(Met-S,N)Cl2] 2+ with selenomethionine to determine what types of products are produced. Monochelates including [Pt(SeMet-Se,N)Cl2] 2+ have formed two isomers, as well as other products that insinuate both selenomethionine and methionine binding with the platinum to form various [Pt(SeMet- Se,N)(Met-S,N)]2+ products. When initially reacting 6 mM [Pt(Met-S,N)Cl2] 2+ with 3 mM SeMet, the monochelates of both are produced without forming any free methionine which would suggest that there is free platinum in our solution creating the SeMet monochelate. When adding additional SeMet to the solution the same products are formed that are created when reacting 6 mM [Pt(Met-S,N)Cl2] 2+ and 6 mM SeMet. The 1H NMR spectrum for these products imply a product of [Pt(SeMet-Se,N)(Met-S,N)] 2+. Also, reactions with [Pt(en)(ox)] 2+ and SeMet were conducted and produced various products at two different pH’s. A [Pt(SeMet-Se,N2] 2+ product was formed at lower pH and produced free ethylenediamine, however at a higher pH only [Pt(en)(SeMet-Se,N)]2+ was produced.

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Wong, Donald Chun Kit. "Toxic effects of selenite and selenate on marine microalgae : a physiological and ultrastructural study". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29341.

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Seven species of marine phytoplankters assigned to different taxonomic divisions were tested for toxic responses to two different molecular species of selenium known to be prevalent in seawater, selenite and selenate. Selenate proved to be more toxic than selenite, although severe toxicity was only observed at high concentrations (10⁻² and 10⁻³ M) of both selenate and selenite. At these concentrations, growth was completely or severely inhibited in most species tested. In some of the species that remained viable, both the percentage of motile cells and their swimming speed were drastically reduced. Scanning electron microscopy revealed that, under these circumstances, Dunaliella tertiolecta cells possessed much shorter flagella compared to the controls, while those that became non-motile lacked flagella altogether. Despite these striking alterations in both growth and morphology, cells of Amphidinium carterae, Dunaliella tertiolecta and Pavlova lutheri showed, after prolonged exposures, signs of adaptation to high selenium concentrations. Lower concentrations of selenium were generally non-toxic and frequently even stimulatory to growth. These observations suggest that for meaningful inferences on selenium toxicity both the concentration range and the length of the studies must be considered and the potential for adaptation to high selenium concentrations taken into consideration. The main ultrastructural and physiological changes in cells of Dunaliella tertiolecta, Pavlova lutheri and Amphidinium carterae treated with selenite or selenate involved the cell coat, mitochondria, chloroplasts as well as the respiratory and photosynthetic rates. Other changes were observed in the nucleus, lipids, vacuoles, nitrogen and carbon contents, but these showed greater variability among the microalgae studied. The major alterations suggested that energy transducing systems were severely affected by selenium toxicity. These led to significant decreases or even elimination of storage products which were indicative of severe shortage in energy and produced major reductions in growth. These occurred later upon exposure to the toxicant and coincided with the loss of cell coat material, suggesting that the shedding of cell surface material might play a major role in the detoxification and adaptation of the microalgae to toxic concentrations of selenium.
Science, Faculty of
Botany, Department of
Graduate

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Più fonti

Libri sul tema "Selenium compounds"

Inc, ebrary, a cura di. Organoselenium chemistry: Synthesis and reactions. Weinheim: Wiley-VCH, 2012.

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Patai, Saul, e Zvi Rappoport, a cura di. Organic Selenium and Tellurium Compounds (1986). Chichester, UK: John Wiley & Sons, Inc., 1986. http://dx.doi.org/10.1002/9780470771761.

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Netherlands. Werkgroep van Deskundigen ter Vaststelling van MAC-Waarden. Rapport inzake grenswaarde selenium en verbindingen: Gezondheidskundig advies. Voorburg: Directoraat-Generaal van de Arbeid van het Ministerie van Sociale Zaken en Werkgelegenheid, 1989.

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Kagaku Busshitsu Hyōka Kenkyū Kikō e Shin Enerugī Sangyō Gijutsu Sōgō Kaihatsu Kikō (Japan), a cura di. Seren oyobi sono kagōbutsu: Selenium and its compounds. Tōkyō: Seihin Hyōka Gijutsu Kiban Kikō Kagaku Busshitsu Kanri Sentā, 2009.

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Selenium reagents and intermediates in organic synthesis. Oxford: Pergamon, 1986.

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Paulmier, Claude. Selenium reagents and intermediates in organic synthesis. Oxford [Oxfordshire]: Pergamon, 1986.

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Rappoport, Zvi. The chemistry of organic selenium and tellurium compounds. Hoboken, NJ: Wiley, 2012.

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Saul, Patai, e Rappoport Zvi, a cura di. The Chemistry of organic selenium and tellurium compounds. Chichester [Sussex]: Wiley, 1986.

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Patai, Saul, a cura di. Organic Selenium and Tellurium Compounds Vol. 2 (1987). Chichester, UK: John Wiley & Sons, Inc., 1987. http://dx.doi.org/10.1002/9780470771785.

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Yang. Beijing: Ke xue chu ban she, 1990.

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Capitoli di libri sul tema "Selenium compounds"

Rayman, Margaret P. "Selenium". In Bioactive Compounds and Cancer, 411–48. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-60761-627-6_19.

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Weidlein, Johann. "Organoindium-Selenium Compounds". In In Organoindium Compounds, 252. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-09144-9_6.

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Maire, Jean-Claude, Ulrich Krüerke, Marlis Mirbach, Wolfgang Petz e Christa Siebert. "Organogallium-Selenium Compounds". In Ga Organogallium Compounds, 243. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-07374-2_7.

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Nagy, Zoltán. "Se—Selenium". In Electrochemical Synthesis of Inorganic Compounds, 412–14. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_59.

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Thompson, Henry J. "Role of low molecular weight, selenium-containing compounds in human health". In Selenium, 283–97. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1609-5_23.

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Fan, Anna M., e Marco Vinceti. "Selenium and its Compounds". In Hamilton & Hardy's Industrial Toxicology, 205–28. Hoboken, New Jersey: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118834015.ch30.

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Breydo, Leonid. "Selenium, Biologically Active Compounds". In Encyclopedia of Metalloproteins, 1919–24. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-1533-6_485.

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Heller, Gert. "The System Boron-Selenium". In B Boron Compounds, 147–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-06138-1_5.

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Schomburg, Lutz. "Dietary Aspects for Selenium and/or Selenium Compounds". In Molecular and Integrative Toxicology, 51–67. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95390-8_3.

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Bowman, W. Russell. "Selenium Compounds in Radical Reactions". In Organoselenium Chemistry, 111–46. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527641949.ch3.

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Atti di convegni sul tema "Selenium compounds"

Farell, Jana, e Dirk Wallschlaeger. "Determination of Cyclic Elemental Selenium Compounds in Sediments". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.689.

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Pogorilyy, V., E. Evdokimova, M. Khovrenkov, A. Mironov e M. Grin. "SULFUR AND SELENIUM CONTAINING COMPOUNDS OF CHLOROPHYLL A DERIVATIVE". In MedChem-Russia 2021. 5-я Российская конференция по медицинской химии с международным участием «МедХим-Россия 2021». Издательство Волгоградского государственного медицинского университета, 2021. http://dx.doi.org/10.19163/medchemrussia2021-2021-308.

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Antonenko, Kristina, Viesturs Kreicbergs e Ingmars Cinkmanis. "Influence of selenium, copper and zinc on phenolic compounds in rye malt". In 11th Baltic Conference on Food Science and Technology “Food science and technology in a changing world”. Latvia University of Agriculture. Faculty of Food Technology., 2017. http://dx.doi.org/10.22616/foodbalt.2017.020.

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Karelia, Deepkamal N., Manoj K. Pandey, Daniel Plano, Shantu Amin e Arun K. Sharma. "Abstract 814: Novel aspirin based selenium compounds as therapy against pancreatic cancer". In Proceedings: AACR Annual Meeting 2014; April 5-9, 2014; San Diego, CA. American Association for Cancer Research, 2014. http://dx.doi.org/10.1158/1538-7445.am2014-814.

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Robinson, J. M., e G. L. Richmond. "Nonlinear optical measurements of semiconductor interfacial kinetics". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.wg28.

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Abstract (sommario):

Optical second harmonic generation is intrinsically sensitive to the interface between two isotropic media. Static measurements of SH intensity determine, for example, surface symmetry and orientation of adsorbed species. Use of the technique as a real-time probe of interfacial processes requires an ultrafast pulsed laser system. The time dependence of the SH signal following charge injection by either a voltage step or optical pulse monitors interfacial processes such as electrochemical reactions, electron transfer, trapping in surface states, and charge recombination. These new time-resolved measurements potentially provide information about interfacial kinetics and dynamics in the nanosecond and faster time regimes. Among the semiconductors investigated are amorphous selenium thin films, isomorphic selenium-tellurium mixtures, and transition metal hexagonal layer compounds. These materials have practical consequences which range from optical switching candidates to semiconductor electrodes.

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Baqer, Sadiq Mussadaq m., Hatem A. Gzar, Qasim M. Jani, Saja F. Rewaeh e Maryam Abd AL Kadhim Mjali. "Application of Inverse Fluidized Bed Reactor for Removal of Selenium Compounds: A Mini Review". In 2023 Al-Sadiq International Conference on Communication and Information Technology (AICCIT). IEEE, 2023. http://dx.doi.org/10.1109/aiccit57614.2023.10218217.

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Greiner, A., R. Feltes, J. Hildebrand, T. Göen e H. Drexler. "357 Occupational exposure to selenium compounds, its effect on biological parameters and markers of diabetes". In 32nd Triennial Congress of the International Commission on Occupational Health (ICOH), Dublin, Ireland, 29th April to 4th May 2018. BMJ Publishing Group Ltd, 2018. http://dx.doi.org/10.1136/oemed-2018-icohabstracts.1147.

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Djur, Svetlana, Ion Tasca, Liliana Cepoi e Valeriu Rudic. "Estimation of malondialdehyde content in Arthrospira platensis Cnmn-cb-11 cultivated in the presence of inorganic selenium (IV) compounds". In National Scientific Symposium With International Participation: Modern Biotechnologies – Solutions to the Challenges of the Contemporary World. Institute of Microbiology and Biotechnology, Republic of Moldova, 2021. http://dx.doi.org/10.52757/imb21.022.

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Qi, Yongmei, Norberta W. Schoene, Frederick M. Lartey e Wen-Hsing Cheng. "Abstract 850: Selenium compounds activate ATM-dependent DNA damage response via the mismatch repair protein hMLH1 in colorectal cancer cells". In Proceedings: AACR 102nd Annual Meeting 2011‐‐ Apr 2‐6, 2011; Orlando, FL. American Association for Cancer Research, 2011. http://dx.doi.org/10.1158/1538-7445.am2011-850.

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Suzuki, Yuichiro, Noriyuki Urakami e Yoshio Hashimoto. "Physical vapor transport growth of trigonal selenium crystal". In 2019 Compound Semiconductor Week (CSW). IEEE, 2019. http://dx.doi.org/10.1109/iciprm.2019.8819225.

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