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Showing 1 to 20 of 26 for “"Iodate"”.
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Iodate Transformation By Marine Phytoplankton
… are suspected to mediate the transformation of iodate to iodide via reduction by the enzyme nitrate reductase. However, there has been no direct evidence to support this hypothesis.</p> <p>The influence of phytoplankton on the speciation of iodine was examined with emphasis on the transformation …
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The marine chemistry of iodate.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Anodic dissolution of zinc in potassium iodide-potassium iodate solutions
"The anodic dissolution of Zn was studied in KI-KIO₃ solutions at 25ºC. In I⁻ solutions, it was found that the apparent valence of Zn ions going into solution is approximately two. Smaller values are obtained in IO₃⁻ solutions, with the most pronounced changes occurring in the higher …
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The Biogeochemistry of Iodine in Seawater
<p>Iodate and iodide are the two major species of iodine in seawater. In comparison to iodate, iodide is thermodynamically unstable in oxic seawater. The conversion (or reduction) of iodate to iodide may be mediated via biological activities. Since biological activities vary with the season, the …
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Dissolved inorganic and particulate iodine in the oceans
… have been developed for the determination of iodate, iodide and particulate iodine in sea water. Iodate is converted to tri-iodide and the absorbance of tri-iodide at 353 nm is measured. The precision of this method is ca. ±3%. Iodide is first separated from most other anions by an AG 1-x8 …
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Nitrate Reductase Activity, Nitrate Uptake and Iodine Speciation in the Marine Environment
… the ability of NR to catalyze the reduction of iodate to iodide.</p> <p>An improved method for the determination of NRA was developed. The sensitivity of this method is about five times higher than methods used in previous studies. NRA and <sup>15</sup>NO<sub>3</sub><sup>–</sup> uptake (NU) were …
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Non-Volatile Dissolved Organic Iodine in Marine Water
… is converted to DOI. In the latter, most likely, iodate is converted to DOI. Naturally occurring phytoplankton in shelf break water contribute more to the production of DOI than that in the open ocean.</p> <p>DOI can be rapidly decomposed when exposed to sunlight. The half life of the photolysis …
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Marine iodine biogeochemistry: inorganic speciation, redox dynamics and organic complexation
… inorganic iodine species in seawater, iodide and iodate, were conducted in the oligotrophic waters of the North Pacific and the oxygen minimum zones of the Eastern Tropical Pacific. The observed distributions reflect the impact of both in situ and ex situ processes on dissolved iodine …
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thesis in the field of Chemical Oceanography: Marine iodine biogeochemistry: inorganic speciation, redox dynamics and organic complexation
… inorganic iodine species in seawater, iodide and iodate, were conducted in the oligotrophic waters of the North Pacific and the oxygen minimum zones of the Eastern Tropical Pacific. The observed distributions reflect the impact of both in situ and ex situ processes on dissolved iodine …
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Developing iodine proxies for oceanic oxygenation conditions during greenhouse episodes
… system biogeochemical model simulations. </p> <p>Iodate and iodide are the most thermodynamically stable iodine ions in seawater. The speciation of iodine depends on the redox condition of the ambient seawater. Iodate is abundant in oxic water, and iodide dominates in anoxic water. Iodate is the …
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Solid state and nuclear results from Mössbauer studies with I[superscript 129]
… is computed. c) The isomeric shifts for some iodates indicate that their 5s-electron density is about 18% lA.rger than that of the iodides. This increase is caused by the partial removal of 5p electrons from iodine in the I-O bonds, which results in reduced screening of the 5s electrons. The …
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Geochemical Insights into Earth Materials from Quantum Mechanical Computation
… each case iodine is most easily accommodated as iodate (IO3) onto the carbonate site. Local strain fields around the iodate solute atom are revealed in the pair distribution functions for the relaxed structures, which indicate that aragonite displays the greatest degree of local structural …
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IODINE SPECIATION IN MARINE AEROSOL
… 8.4 pmol m-3). The proportions of iodide (I-), iodate (IO3-) and soluble organic iodine (SOI) on the three cruises also showed a high variability: AMT21: I- 5.2–39%, median 14%; IO3- 36–99%, median 66%; and SOI 13–47%, median 28%, TransBrom: I- 8.8–64%, median 46%; IO3- 1.8–65%, median 6.2%; and …
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Perturbation studies of excitable media
… response to pH between 4 and 7, the ferrocyanide-iodate-sulfite (FIS) reaction, which exhibits pH oscillations between 4 and 7.5 in a continuously stirred tank reactor (CSTR), is a good candidate for studies of oscillatory gel systems.;This work also focused on two dynamical phenomena in the …
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[57]Fe Mossbauer spectroscopy and complementary analysis of tin coated steel.
… By removing the tin overlayers using a potassium iodate / sodium hydroxide solution any intermetallics from the uppermost surface layer of the samples and can be identified. Commercially produced DWI tinplate shows some signs of FeSn2 on the ironed walls where temperatures reach 200°C, and no …
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Drinking water disinfection by-products detection, formation and the precursors removal study
… of all these HAAs, bromate, bromide, iodide, and iodate, seventeen compounds in total, without any tedious sample preparation. Besides an efficient analytical method for the detection of DBPs, seeking for a green disinfectant with a low formation of DBPs is necessary. Peracetic acid (PAA) has been …
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Nanomicelles And Liposomes For Improving Drug Delivery of Small Molecules And siRNA Therapeutic Agents
… decrease in ROS in D407 cells pre-treated sodium iodate (ROS inducing agent) after treating with TAC-NMF and tacrolimus drug. Similarly, there was a reduction in the pro-inflammatory cytokines and VEGF-A in D407 cells pretreated with sodium iodate. This can indicate that TAC-NMF could lower …
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The maculoprotective effect of a thiol antioxidant in retinal degeneration models
… hydroperoxide (TBHP) and sodium iodate (NaIO₃) in a cell model and an animal model to evaluate the effects of NACA. Our data suggest that pretreatment with NACA reduces the sub-lethal (but not lethal) effects of TBHP in primary cultures of human retinal pigment epithelial cells. …
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Analysis and occurrence of disinfection by-products in fresh and salt water
… and/or iodinated acetic acids, bromate, iodate, bromide, and iodide using ion chromatography-inductively couple plasma-mass spectrometry (IC-ICP-MS). A new solid phase microextration gas chromatography-mass spectrometry (SPME GC-MS) method was also developed for rapid trihalomethanes …
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Regulating the bioactivity of placental growth factor in the aging outer retina as a new therapeutic approach to age-related macular degeneration
… inhibition can attenuate pathology in a sodium iodate (NaIO3) model of GA. <br/><br/>In chapter 2 PlGF and its receptors were detected in human macula in late AMD and could be detected in cultured RPE. PlGF treatment of RPE increased permeability via ERK1/2 signalling and altered ZO-1 …
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