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Monday, October 19, 2020 | History

2 edition of Biotransformation and chemical form of mercury in plants found in the catalog.

Biotransformation and chemical form of mercury in plants

Don D. Gay

Biotransformation and chemical form of mercury in plants

by Don D. Gay

  • 383 Want to read
  • 19 Currently reading

Published by U.S. Environmental Protection Agency, Office of Research and Development, Environmental Monitoring and Support Laboratory, Monitoring Systems Research and Development Division, for sale by the National Technical Information Service in Las Vegas, Nev, Springfield, Va .
Written in English

    Subjects:
  • Biochemistry.,
  • Botanical chemistry.,
  • Mercury.,
  • Plant physiology.

  • Edition Notes

    Bibliography: p. 7-9.

    Statementby Don D. Gay.
    SeriesEcological research series ; EPA-600/3-76-082
    ContributionsUnited States. Environmental Protection Agency. Office of Research and Development.
    The Physical Object
    Paginationiii, 9 p. :
    ID Numbers
    Open LibraryOL17645720M

      Mercury, a metal element, exists naturally throughout the world--most notably in the oceans, which contain an estimated hundreds of thousands of tons of mercury, as well as in most forms of plant Author: Alex Epstein. Mercury emission from waste combustors is determined largely by the mercury feed rate and by whether mercury-specific APCDs are used. Virtually all mercury species found in wastes are volatile at combustion temperatures, so there is a high degree of partitioning to the gas phase, regardless of the chemical form of mercury or the combustion.

    In an illuminating talk by Mani Subramanian of The Dow Chemical Company, the process of biodegrading a waste compound is being integrated into manufacturing by biotransforming the unwanted side reaction product, 1,2,3-trichloropropane, into epichlorohydrin, a product of commercial by: Mercury is a chemical element with the symbol Hg and atomic number It is commonly known as quicksilver and was formerly named hydrargyrum (/ h aɪ ˈ d r ɑːr dʒ ər ə m / hy-DRAR-jər-əm). A heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these Group: group

    Structure and chemistry "Methylmercury" is a shorthand for the hypothetical "methylmercury cation", sometimes written "methylmercury(1+) cation" or "methylmercury(II) cation".This functional group is composed of a methyl group bonded to a chemical formula is C H 3 Hg + (sometimes written as MeHg +).Methylmercury exists as a substituent in many complexes of the type [MeHgL] + (L. The biotransformation and bioconcentration of natural and synthetic steroid estrogens by Chlorella vulgaris were investigated by using batch-shaking experiments with incubation for 48 h in the light or dark. Estradiol and estrone were interconvertible in both light and dark conditions; however, this biotransformation showed a preference for by:


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Biotransformation and chemical form of mercury in plants by Don D. Gay Download PDF EPUB FB2

Additional Physical Format: Online version: Gay, Don D. Biotransformation and chemical form of mercury in plants. Las Vegas, Nev.: U.S. Environmental Protection Agency, Office of Research and Development, Environmental Monitoring and Support Laboratory, Monitoring Systems Research and Development Division ; Springfield, Va.

EPA/ July BIOTRANSFORMATION AND CHEMICAL FORM OF MERCURY IN PLANTS by Don D. Gay Monitoring Systems Research and Development Division Environmental Monitoring and Support Laboratory Las Vegas, Nevada U.S. ENVIRONMENTAL PROTECTION AGENCY OFFICE OF RESEARCH AND DEVELOPMENT ENVIRONMENTAL MONITORING AND.

Get this from a library. Biotransformation and chemical form of mercury in plants. [Don D Gay; United States. Environmental Protection Agency. Office of Research and Development,; Environmental Monitoring and Support Laboratory (Las Vegas, Nev.).

Monitoring Systems Research and. Abstract. The biotransformation of mercury was monitored in Hymenoscyphus ericae (Read) Korf & Kernan, Neocosmospora vasinfecta E. Sm., and Verticillium terrestre (Link) Lindau following the exposure of these fungi to environmentally relevant doses of Hg II (HgCl 2) in aerated pH-controlled cultures.

Mercury applied at and μgL –1 quickly associated with cells of N. by: Abstract. Biotransformation of organic xenobiotics normally proceed in a first step of oxidation (phase I) that introduces a reactive group in the xenobiotic, and a second step of conjugation (phase II) with a nontoxic endogenous metabolite that yields an excretable product.

Phase I of biotransformation is mediated by inducible cytochrome P dependent monooxygenases (CYP). Methyl mercury may be metabolized to inorganic mercury by the liver and kidneys, with the inorganic form then entering an oxidation-reduction cycle in the red blood cells, lungs, and liver.

Methyl mercury remaining in the gastrointestinal tract is converted to inorganic mercury by the intestinal flora. Fish and shellfish have a natural tendency to concentrate mercury in their bodies, often in the form of methylmercury, a highly toxic organic compound of mercury.

As mercury and methylmercury are fat soluble, they primarily accumulate in the viscera, although they are also found throughout the muscle tissue (Cocoros et al., ). Species of fish that are high on the food chain, such as shark.

Mercury poisoning has become a problem of current interest as a result of environmental pollution on a global scale. Natural emissions of mercury form two-thirds of the input; manmade releases form about one-third.

Considerable amounts of mercury may be added to agricultural land with sludge, fertilizers, lime, and manures. The most important sources of contaminating agricultural soil Cited by: 1. Introduction. Mercury is a hazardous environmental contaminant.

In Japan, people have been affected and have died due to Minamata Disease for the past two decades, caused by elevated mercury pollution from a chemical plant (Kudo and Miyahara, ).Toxicology studies also proved that mercury, especially methyl mercury (MeHg), is very toxic to the human embryo and fetus (Bakir et Cited by: Elemental mercury and inorganic mercury compounds: human health aspects.

(Concise international chemical assessment document ; 50) y - adverse effects y compounds - adverse effects assessment nmental exposure tional exposure ational Programme on Chemical Safety File Size: KB. The biotransformation of Hg(II) by cyanobacteria was investigated under aerobic and pH-controlled culture conditions.

Mercury was supplied as HgCl2 in amounts emulating those found under heavily. mercury. The latter forms a variety of inorganic as well as organometallic compounds. In the case of organometallic derivatives, the mercury atom is covalently bound to one or two carbon atoms.

In its elemental form, mercury is a dense, silvery-white, shiny metal, which is liquid at. Bioaccumulation and Biotransformation of Heavy Metals profile and chemical analysis of the plant in the growth media suggest that heavy metal was phytoextracted by fibrous roots, then.

T1 - The chemical cycle and bioaccumulation of mercury. AU - Morel, François M M. AU - Kraepiel, Anne M L. AU - Amyot, Marc. PY - /12/1. Y1 - /12/1. N2 - Because it is very toxic and accumulates in organisms, particularly in fish, mercury is an important pollutant and one of Cited by: Although all chemical forms of mercury are toxic, public health concerns are focused on methylmercury (MeHg).

One of the major routes of human exposure to this toxic element is through the consumption of contaminated fish (ClarksonClarkson ), where mercury is mostly present in its methylated form (Storelli et al., ).

This is the Cited by: The molecular structure of a variety of novel mercury–phytochelatin complexes was evidenced in rice plants exposed to inorganic mercury (Hg2+) using RP. Biotransformation is the chemical modification (or modifications) made by an organism on a chemical compound.

If this modification ends in mineral compounds like CO 2, NH 4 +, or H 2 O, the biotransformation is called mineralisation. Biotransformation means chemical alteration of chemicals such as nutrients, amino acids, toxins, and drugs in the is also needed to render non-polar.

The amount of mercury deposited in a given area depends on how much mercury is released from local, regional, national, and international sources. Emissions from Power Plants. Since mercury occurs naturally in coal and other fossil fuels, when people burn these fuels for energy, the mercury becomes airborne and goes into the atmosphere.

Mercury Mercury is an element and a metal that is found in air, water, and soil. It exists in three forms that have different properties, usage, and toxicity. The three forms are called elemental (or metallic) mercury, inorganic mercury compounds, and organic mercury compounds. Elemental mercury is liquid at room Size: KB.

The biotransformation of arsenic was studied in microcosm experiments in which a sandy (machair) soil, traditionally manured with seaweed, was amended with Laminaria digitata and Fucus vesiculosus. In both seaweed species, the arsenic occurs in the form of arsenosugars (85%). Biotransformation of mercury in fish In aquatic environment, inorganic Hg and organic Hg can be converted into each other through methylation and demethylation.

The transformation between different Hg species is one of the most important processes in the overall Hg biogeochemistry, and can occur via biotic or abiotic by: 3.The identities and properties of mercury species in crude oil were investigated.

Dimethylmercury (DMHg) and elemental mercury (Hg0) were independently quantified as volatile species evaporated from a single crude oil using selective trapping. Henry's law constants of Hg0 and DMHg in toluene were determined by measuring concentrations in vapor/liquid equilibrium over a range of by: Furthermore, the efficiency of conversion into β-HgS by cyanobacteria may lead to the development of applications in the bioremediation of mercury.

Mercury in the form of divalent ions constitutes the bulk of that in soils, where it is bound to organic compounds, to clay, and as sulfides (31).Cited by: