Journal ArticleDOI
The origin of naturally occurring perchlorate: the role of atmospheric processes.
Purnendu K. Dasgupta,P. Kalyani Martinelango,W. Andrew Jackson,Todd A. Anderson,Kang Tian,Richard W. Tock,Srinath Rajagopalan +6 more
Reads0
Chats0
TLDR
It is shown that perchlorate is readily formed by a variety of simulated atmospheric processes, and is present in many rain and snow samples, which strongly suggests that some per chlorate is formed in the atmosphere and a naturalperchlorate background of atmospheric origin should exist.Abstract:
Perchlorate, an iodide uptake inhibitor, is increasingly being detected in new places and new matrices. Perchlorate contamination has been attributed largely to the manufacture and use of ammonium perchlorate (the oxidizer in solid fuel rockets) and/or the earlier use of Chilean nitrate as fertilizer (∼0.1% perchlorate). However, there are regions such as the southern high plains (Texas Panhandle) where there is no clear historical or current evidence of the extensive presence of rocket fuel or Chilean fertilizer sources. The occurrence of easily measurable concentrations of perchlorate in such places is difficult to understand. In the southern high plains groundwater, perchlorate is better correlated with iodate, known to be of atmospheric origin, compared to any other species. We show that perchlorate is readily formed by a variety of simulated atmospheric processes. For example, it is formed from chloride aerosol by electrical discharge and by exposing aqueous chloride to high concentrations of ozone. ...read more
Citations
More filters
Journal ArticleDOI
Detection of Perchlorate and the Soluble Chemistry of Martian Soil at the Phoenix Lander Site
Michael H. Hecht,Samuel P. Kounaves,Richard C. Quinn,S. J. West,S. M. M. Young,Douglas W. Ming,David C. Catling,David C. Catling,B. C. Clark,William V. Boynton,John H. Hoffman,Lauren DeFlores,K. Gospodinova,J. Kapit,Peter H. Smith +14 more
TL;DR: Results suggest that the soil at the Phoenix landing site must have suffered alteration through the action of liquid water in geologically the recent past, and revealed an alkaline environment in contrast to that found by the Mars Exploration Rovers, indicating that many different environments have existed on Mars.
Journal ArticleDOI
Urinary Perchlorate and Thyroid Hormone Levels in Adolescent and Adult Men and Women Living in the United States
Benjamin C. Blount,James L. Pirkle,John D. Osterloh,Liza Valentin-Blasini,Kathleen L. Caldwell +4 more
TL;DR: In this article, the authors examined the relationship between urinary perchlorate and serum thyroid hormones in men and women, ≥ 12 years of age, who participated in NHANES 2001-2002.
Journal ArticleDOI
Atmospheric origins of perchlorate on Mars and in the Atacama
David C. Catling,David C. Catling,Mark Claire,Kevin Zahnle,Richard C. Quinn,Richard C. Quinn,B. C. Clark,Michael H. Hecht,Samuel P. Kounaves +8 more
TL;DR: A preliminary study of the means to produce Atacama perchlorate to help shed light on the origin of Martian perchlorates has been conducted in this paper, using a 1-D photochemical model.
Journal ArticleDOI
Endocrine disruptors and thyroid hormone physiology.
TL;DR: The main thyroid-disrupting chemicals are surveyed, and the review then focuses on disrupting mechanisms known to be directly or indirectly related to the transcriptional activity of the thyroid hormone receptors.
Journal ArticleDOI
Degradation of BTEX by anaerobic bacteria: physiology and application
TL;DR: The existing knowledge on the degradation of benzene and other aromatic hydrocarbons by anaerobic bacteria, in particular the physiology and application is reviewed, including results on the (per)chlorate stimulated degradation of these compounds, which is an interesting new alternative option for bioremediation.
References
More filters
Journal ArticleDOI
Maternal thyroid deficiency during pregnancy and subsequent neuropsychological development of the child.
James E. Haddow,Glenn E. Palomaki,Walter C. Allan,Josephine Williams,George J. Knight,June Gagnon,Cheryl E. O’heir,Marvin L. Mitchell,Rosalie J. Hermos,Susan E. Waisbren,James D. Faix,Robert Z. Klein +11 more
TL;DR: Undiagnosed hypothyroidism in pregnant women may adversely affect their fetuses; therefore, screening for thyroid deficiency during pregnancy may be warranted.
Journal ArticleDOI
African Droughts and Dust Transport to the Caribbean: Climate Change Implications
Joseph M. Prospero,Peter J. Lamb +1 more
TL;DR: Regression estimates based on long-term rainfall data suggest that dust concentrations were sharply lower during much of the 20th century before 1970, when rainfall was more normal.
Journal ArticleDOI
Inactivating mutations in the gene for thyroid oxidase 2 (THOX2) and congenital hypothyroidism.
José Moreno,Hennie Bikker,Marlies Kempers,A S Paul van Trotsenburg,Frank Baas,Jan J. M. de Vijlder,Thomas Vulsma,Carrie Ris-Stalpers +7 more
TL;DR: Biallelic inactivating mutations in the THOX2 gene result in complete disruption of thyroid-hormone synthesis and are associated with severe and permanent congenital hypothyroidism.
Journal ArticleDOI
Iodine chemistry and its role in halogen activation and ozone loss in the marine boundary layer: A model study
TL;DR: A detailed set of reactions treating the gas and aqueous phase chemistry of the most important iodine species in the marine boundary layer (MBL) has been added to a box model which describes Br and Cl chemistry in the MBL.
Journal ArticleDOI
Broad-Spectrum, Non-Opioid Analgesic Activity by Selective Modulation of Neuronal Nicotinic Acetylcholine Receptors
A. W. Bannon,M. W. Decker,M. W. Holladay,P. Curzon,D. Donnelly-Roberts,P. S. Puttfarcken,R. S. Bitner,A. Diaz,Anthony H. Dickenson,Roger D. Porsolt,M. Williams,S. P. Arneric +11 more
TL;DR: In this article, a potent nAChR ligand called ABT-594 was developed that has antinociceptive properties equal in efficacy to those of morphine across a series of diverse animal models of acute thermal, persistent chemical, and neuropathic pain states.