The synthesis of organic iodine compounds in wheat roots

1959 ◽  
Vol 46 (20) ◽  
pp. 584-584 ◽  
Author(s):  
Z. Böszörményi ◽  
Edith Cseh ◽  
L. Gáspár
Keyword(s):  
Wheat Roots ◽  
Organic Iodine ◽  
Iodine Compounds

Iodine and Halocarbon Response of Laminaria digitata to Oxidative Stress and Links to Atmospheric New Particle Production

2005 ◽  
Vol 2 (4) ◽  
pp. 282 ◽  
Author(s):  
Carl J. Palmer ◽  
Thorsten L. Anders ◽  
Lucy J. Carpenter ◽  
Frithjof C. Küpper ◽  
Gordon B. McFiggans
Keyword(s):  
Oxidative Stress ◽  
Particle Production ◽  
Marine Boundary Layer ◽  
Oxidative Capacity ◽  
Molecular Iodine ◽  
Laminaria Digitata ◽  
Organic Iodine ◽  
Free Air ◽  
Iodine Compounds ◽  
Iodine Release

Environmental Context.Various organic iodine compounds (including CH3I, CH2ClI, CH2BrI, CH2I2) are present throughout the marine boundary layer as a result of their production from seaweeds, phytoplankton, and photolysis reactions occurring in seawater. In air, these compounds rapidly photolyse to give atomic I which subsequently reacts with ozone to form iodine oxide, potentially leading to perturbations of the tropospheric oxidative capacity and nucleation of atmospheric particles. Recent research has identified molecular iodine as an additional source of iodine atoms to coastal areas. Here we study the relative roles and controls of gaseous organic and molecular iodine release from the seaweed Laminaria digitata. Abstract.Changes in the halocarbon, I2 and particle production of the brown algal kelp Laminaria digitata as a response to different chemical stresses have been investigated. Oxidative stress (caused by either exogenous hydrogen peroxide, gaseous ozone or a solution of oligoguluronates, known elicitors of oxidative stress) caused increased halocarbon and I2 production by the seaweed. The maximum I2 release was observed under exposure to O3 (at several hundred parts per billion by volume (ppbv)), whereas oligoguluronates elicited the highest release of iodine-containing halocarbons including CH2I2. Significantly greater production of I2, compared to CH2I2, was observed at atmospheric levels of ozone. Particle production was observed only when the Laminaria samples were exposed to ozone (up to 16 000 cm−3 s−1 per gram fresh weight (FW) of seaweed with a ~2 min residence time and with a total I atom flux of 1.6 × 108 cm−3 s−1 g−1 FW from photolysis of I2); passing O3-free air over the unstressed seaweed followed by secondary mixing with ozone did not result in any measurable particle formation. Our limited data indicate that ozone elicits abiotic production of I2 from Laminaria and that there is a direct relationship between the amount of I2 released and the number of particles formed. The results support the recent hypothesis that molecular iodine rather than volatile organic iodine (e.g. CH2I2) release from exposed seaweeds is the major source of coastal new particle production.

scholarly journals Iodine speciation and size distribution in ambient aerosols at a coastal new particle formation hotspot in China

2019 ◽  
Vol 19 (6) ◽  
pp. 4025-4039 ◽  
Author(s):  
Huan Yu ◽  
Lili Ren ◽  
Xiangpeng Huang ◽  
Mingjie Xie ◽  
Jun He ◽  
...  
Keyword(s):  
Particle Formation ◽  
Coastal Areas ◽  
Aerosol Sample ◽  
Size Distributions ◽  
New Particle Formation ◽  
Nucleation Mode ◽  
Iodine Species ◽  
Organic Iodine ◽  
Iodine Compounds ◽  
Iodine Speciation

Abstract. Intense new particle formation (NPF) events were observed in the coastal atmosphere during algae growth and farming season at Xiangshan gulf of the east China coast. High nucleation-mode iodine concentrations measured by ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS) confirmed that the NPF events were induced by iodine species. Our study provides important information on iodine speciation, size distributions, and its role in NPF in the context of heavy air pollution in China's coastal areas. For the first time, we identified 5 inorganic iodine species, 45 organic iodine compounds (35 molecular formulas), and a group of iodide–organic adducts in aerosols. The concentrations and size distributions of iodine species down to 10 nm were measured during the iodine-induced NPF, continental NPF, and non-NPF days at the coastal site and compared to those at an inland site. The iodine in the above four aerosol sample types were characterized by iodate, aromatic iodine compounds, iodoacetic acid or iodopropenoic acid, and iodide–organic adducts, respectively. Iodide and organic iodine compounds were found in the nucleation-mode particles; however, it is still not clear whether they contributed to nucleation or just new particle growth. Wild algae, as well as farmed algae, could be an important NPF source in China's coastal areas.

scholarly journals Erratum

1968 ◽  
Vol 14 (6) ◽  
pp. 582-582
Keyword(s):  
Distilled Water ◽  
Serum Thyroxine ◽  
Organic Iodine ◽  
Final Volume ◽  
Iodine Compounds

Abstract The article "Determination of Organic Iodine Compounds in Serum: IV. A New Nonincineration Technic for Serum Thyroxine" by Vincent J. Pileggi and Gerald Kessler—Clin. Chem. 14, 339 (1968)—contains an error. On page 340, under Reagents, the preparation of the bromate-bromide reagent should read: Bromate-bromide reagent (0.1 M KBrO3, 0.6 M KBr) KBrO3, 1.67 gm., and KBr, 7.14 gui., are dissolved in distilled water, and the solution made to a final volume of 100 ml.

Modified Method for Determination of Certain Organic Iodine Compounds, Inorganic Iodide in Plasma and Urine.

1940 ◽  
Vol 45 (1) ◽  
pp. 433-437 ◽  
Author(s):  
H. L. White ◽  
D. Rolf
Keyword(s):  
Organic Iodine ◽  
Modified Method ◽  
Iodine Compounds

scholarly journals On the Blood Levels of Organic Iodine Compounds in Various Diseases

1958 ◽  
Vol 34 (5) ◽  
pp. 430-445,397
Author(s):  
Masaaki NAGAMORI
Keyword(s):  
Blood Levels ◽  
Organic Iodine ◽  
Iodine Compounds

EFFECT OF LARGE DOSES OF RADIOIODINE ON THYROID FUNCTION

1965 ◽  
Vol 48 (1) ◽  
pp. 9-13 ◽  
Author(s):  
M. Jovanović ◽  
Dj. Djurdjević ◽  
J. Sinadinović
Keyword(s):  
Epithelial Cells ◽  
Thyroid Function ◽  
Organic Iodine ◽  
Iodine Compounds ◽  
Thyroid Glands

ABSTRACT The effect was studied of large doses of radioiodine on the relative amounts of various organic iodine compounds present in the thyroid glands of rats. At 24 hours there was no effect of radiation from 131I on the relative amounts of diiodotyrosine, monoiodotyrosine, and thyroxine plus triiodothyronine found in the gland. After 48 hours and 5 days, during which time there is known to be considerable destruction of epithelial cells, there was an inhibition of thyroxine synthesis but not of the iodination of tyrosine. There is evidence that even at some days after irradiation at the levels used some follicles are preserved and able to synthesize hormones.

An improved chromatography of organic iodine compounds on Tris-maleate buffer treated paper

1968 ◽  
Vol 35 ◽  
pp. 434-435 ◽  
Author(s):  
D. Razevska ◽  
J.T. Dowling
Keyword(s):  
Organic Iodine ◽  
Iodine Compounds ◽  
Tris Maleate

Seasonal variation of volatile organic iodine compounds in the water column of Funka Bay, Hokkaido, Japan

2016 ◽  
Vol 74 (2) ◽  
pp. 205-225 ◽  
Author(s):  
Yusaku Shimizu ◽  
Atsushi Ooki ◽  
Hiroji Onishi ◽  
Tetsuya Takatsu ◽  
Seiji Tanaka ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Water Column ◽  
Organic Iodine ◽  
Funka Bay ◽  
Iodine Compounds ◽  
Volatile Organic

scholarly journals Corrected Heats of Combustion of Organic Iodine Compounds.

1956 ◽  
Vol 10 ◽  
pp. 884-886 ◽  
Author(s):  
Lennart Smith ◽  
Ragnar Larsson ◽  
Kjell Rosengren
Keyword(s):  
Organic Iodine ◽  
Iodine Compounds ◽  
Heats Of Combustion
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