Organometallic compounds and living organisms

Thayer, John S.

doi:10.1016/s0022-328x(00)87375-1

Cited by 111 publications

(79 citation statements)

References 135 publications

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“…Biomethylation of As by transfer of carbonium ions (CHg^) from S-adenosylmethionine (SAM) has also been demonstrated (Thayer, 1984(Thayer, , 1989Andreae, 1986). Original work by Challenger (1945) first demonstrated that trimetbylarsine could be produced by several fungi from arsenite.…”

Section: Metal Transformationsmentioning

confidence: 99%

Interactions of fungi with toxic metals

1993

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SUMMARY This review details the major interactions of fungi with toxic metal species. Physico‐chemical and biological aspects are discussed including definitions and classification of metals in biological contexts, mechanisms of metal fungitoxicity, resistance and tolerance, environmental influences and the occurrence of fungi in metal‐polluted habitats. Cellular interactions include extracellular precipitation and complexation, binding to cell walls, transport of monovalent and divalent metal cations, intracellular fates of toxic metal species (including metal‐binding proteins and peptides, and vacuolar compartmentation), and metal transformations including organometal(loid) synthesis. Significant interactions between metals and mycorrhizal fungi and macrofungi are summarized with reference to the amelioration of plant phytotoxicity and metal accumulation respectively. Biotechnological aspects of metal‐fungal interactions relate to the biological treatment of metal‐contaminated effluents and waste streams for metal removal/recovery and environmental protection.

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Section: Metal Transformationsmentioning

confidence: 99%

Interactions of fungi with toxic metals

1993

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“…Now, the concentration of total mercury (T-Hg) is not by far the most important because various chemical species of mercury behave distinctly, thereby affecting its biogeochemical behavior and toxicity to organisms [2]. As the most toxic mercury species, MeHg is neurotoxic and can cause blockage of binding sites of enzymes, interfere protein synthesis and impede thymidine incorporation into DNA [3]. Furthermore, MeHg could be accumulated in the animal and human food chain more easily than the inorganic forms; thus, it was given particular concern all the time.…”

Section: Introductionmentioning

confidence: 99%

Mercury and Methyl Mercury in Sediments of Northern Lakes-Egypt

Shreadah¹,

Ghani²,

Taha³

et al. 2012

JEP

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Fifty-four sediment samples of the five Northern Egyptian lakes, (Mariout, Edku, El-Burullus, El-Manzallah, and ElBardaweel) were analyzed to investigate the pollution status of mercury (Hg). The total mercury (T-Hg) content in sediment samples ranged from 15.33 to 171.29 ng·g -1 dry wt). The results showed that T-Hg were lower than the back ground values reported and also lower than the ranges of uncontaminated sediments. Moreover, the T-Hg concentrations in all sediments were under the upper chemical Exceedance level (1 µg·g -1 ). The concentrations of Methyl mercury (MeHg) in surface sediments of the Northern lakes ranged from 0.002 -0.023 ng·g -1 dry wt. The contribution of MeHg was less than 0.1% of total mercury concentration with index values from 0.08 -1.37 ng·g -1 ; dry wt). MeHg showed insignificant correlation with T-Hg. This suggested that MeHg contents were not controlled by the T-Hg in sediments. The T-Hg and MeHg concentrations were insignificantly correlated with TOC content which indicates that the concentration of T-Hg and MeHg in sediments of Northern lakes were not influence by TOC. The average T-Hg concentration was found in the following order; Mariout > El-Manzallah > El-Burullus > Edku > El-Bardaweel. While the MeHg was found in the order; El-Bardaweel > El-Burullus ≥ El-Manzallah > Mariout > Edku.

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“…Now, the concentration of total mercury (HgT) is not by far the most important because various chemical species of mercury behave distinctly, thereby affecting its biogeochemical behavior and toxicity to organisms (Cai et al, 1997). As the most toxic mercury species, MeHg is neurotoxic and can cause blockage of binding sites of enzymes, interfere protein synthesis and impede thymidine incorporation into DNA (Thayer, 1984). Furthermore, MeHg could be accumulated in the animal and human food chain more easily than the inorganic forms; thus, it was given particular concern all the time.…”

Section: Introductionmentioning

confidence: 99%

The speciation and bioavailability of mercury in sediments of Haihe River, China

Shi

Liang

Jiang

et al. 2005

Environment International

144

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Twenty-one sediment samples in 11 sites along the Haihe River and Dagu Drainage River, Tianjin, China, were analyzed to investigate the pollution status and bioavailability of mercury (Hg). The results showed that the Haihe River was slightly polluted with Hg when flowing through Tianjin city. On the contrary, the sediments collected from Dagu Drainage River, an important drainage river in Tianjin, were found to have very high Hg concentrations and the highest concentration reached 8779.1 ng g À1 (dry weight). The methylmercury (MeHg) concentrations accounted for 0.1-2.4% (average: 0.9%) of total mercury (HgT) and were strongly influenced by HgT (r=0.91, p=0.99, n=20) and total organic carbon (TOC; r=0.76, p=0.99, n=20) contents in sediments. Moreover, a five-step sequential selective extraction (SSE) procedure was used to study the bioavailability of Hg in sediments. The mercury in sediments existed mainly as element Hg and mercury sulfide, which accounted for 46.5% and 39.0% of HgT, respectively. The percentage of exchangeable Hg (defined as water soluble Hg plus dhuman stomach acidT soluble Hg) was only 0.1-4.6%. The distribution of exchangeable Hg showed an obvious difference to that of HgT, indicating that the HgT concentrations were absolutely insufficient to evaluate the risk of Hg in sediments. D

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Organometallic compounds and living organisms

Cited by 111 publications

References 135 publications

Interactions of fungi with toxic metals

Interactions of fungi with toxic metals

Mercury and Methyl Mercury in Sediments of Northern Lakes-Egypt

The speciation and bioavailability of mercury in sediments of Haihe River, China

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