Changes in Oxygen Consumption and Biochemical Composition of the Marine Fouling Dreissinid BivalveMytilopsis sallei(Recluz) Exposed to Mercury

Devi, V. Uma

doi:10.1006/eesa.1996.0022

Cited by 20 publications

(7 citation statements)

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“…[12] On the otherh and, the interaction betweent he two is subjected to conformation relatedeffects, which lead to binding preferences and specificity. [20][21][22] It is suggested that sulfated oligosaccharides are used by organismsa sp rotectivem atrices against heavy metali on toxicities but over-accumulation of these cations results in diseases and death. [15] Cadmium, mercury and lead are present in toxic, sometimes lethal, concentrationsi ns oil, fresh water sources and sea water that are in proximity to industrial infrastructure.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19] Thus, it is important to monitor the concentrations of thesei ons and to understand more deeply thef actorst hat govern their accumulation in the ECM of specific tissues and by specific organisms. [20][21][22] It is suggested that sulfated oligosaccharides are used by organismsa sp rotectivem atrices against heavy metali on toxicities but over-accumulation of these cations results in diseases and death. [22,23] The effect of sulfation of saccharides on heavy metal binding is largely unknown because it is very difficultt oo btain saccharides with defined size and sulfation pattern.…”

Section: Introductionmentioning

confidence: 99%

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Sulfation Patterns of Saccharides and Heavy Metal Ion Binding

Alshanski

Blaszkiewicz

Mervinetsky

et al. 2019

Chemistry A European J

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Sulfated saccharides are an essentialp art of extracellularm atrices, and they are involvedi nalarge number of interactions. Sulfated saccharide matricesi no rganismsa ccumulate heavy metal ions in addition to othere ssentialm etal ions. Accumulation of heavy metal ions alters the function of the organisms and cells, resulting in severea nd irreversible damage. The effect of the sulfation pattern of saccharides on heavym etal binding preferences is enigmatic because the accessibility to structurally definedsulfated sac-charides is limited and because standard analytical techniquescannot be used to quantify these interactions.Wedeveloped an ew strategy that combines enzymatic and chemicals ynthesis with surfacec hemistry and label-free electrochemical sensing to study the interactions between well-defined sulfated saccharides and heavy metal ions. By using these tools we showedt hat the sulfation pattern of hyaluronic acid governs their heavy metal ions binding preferences.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sulfation Patterns of Saccharides and Heavy Metal Ion Binding

Alshanski

Blaszkiewicz

Mervinetsky

et al. 2019

Chemistry A European J

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“…This ratio provides an indication of the balance in the animal's tissue of the rates of catabolism of protein, carbohydrate, and lipid substrates (Moore et al, 1984;El-Shenawy et al, 2001b). The decrease in oxygen consumption together with the utilization of glycogen and carbohydrates during Hg exposure suggests that these bivalves might shift to anaerobic metabolism in order to counteract the heavy-metal stress in the environment (Devi, 1996).…”

Section: Introductionmentioning

confidence: 99%

Heavy‐metal and microbial depuration of the clam Ruditapes decussatus and its effect on bivalve behavior and physiology

El-Shenawy

2004

Environmental Toxicology

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The bivalve Ruditapes decussatus was evaluated as a possible biomonitor of heavy-metal contamination. Concentrations of copper (Cu), cobalt (Co), iron (Fe), nickel (Ni), and manganese (Mn) were measured in R. decussatus. Water and sediment samples were collected at two stations of Timsah Lake in Ismailia, Egypt, from October to November 2002, using atomic absorption spectrophotometry (AAS). Results from the heavy-metal and microbial analyses indicated that site II was less contaminated than site I. The bivalve showed accumulation of metals, with a bioaccumulation factor (BAF) greater than 4. The bioaccumulation of metals varied strongly according to the sampling site. After 48 h of depuration, Fe, Ni, Co, Cu, and Mn were reduced significantly, to 46.8% and 47.7%, 19.9% and 20.3%, 27.3% and 27.9%, 35.9% and 36.6%, and 18.2% and 26.6%, compared with the initial concentrations, in clam tissue at the two stations. In bivalves from site II the counts of total bacteria, fecal coliforms, and bacterial pathogens were reduced by more than 90%, whereas phage counts were only reduced by 56% after 4 days of depuration. The depuration of bivalves collected from the heavily polluted site (I) was not effective, as coliforms were reduced only by 85% after 4 days, whereas counts of pathogens and pathogenic indicators such as Vibrio, fecal Streptococcus, and coliphage decreased to less than 50% of the initial concentration. The time necessary to decrease contamination to 10%, 50%, and 90% for clams at both stations was consistently shorter for heavy metals than for microorganisms. Investigation of the effects of heavy-metal and microbiological depuration on valve movement and physiological rates (oxygen consumption and ammonia excretion) was carried out on R. decussatus to test the utility of physiological stress indices in assessing the health of depurated animals. Clams in the experimental tanks exhibited various states of activity, which were rated by identifying and scoring (0-4) the different parameters, including shell gap, siphon extension, and foot protrusion. Moreover, an increase in ammonia excretion was usually associated with an increase in respiration rate. The oxygen-to-nitrogen ratio provided a sensitive indicator of bivalve health. It can be concluded that shellfish monitoring and depuration data depended on the initial concentration of the pollutants. There were differences in the physiological responses of clams from the two sites during the periods of pre- and postdepuration of the contaminants. There was a significant correlation between reduction of metal concentration in clam tissue and enhancement of valve movement, as well as activity and increasing respiration rate.

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“…This behaviour may indicate that B. azoricus does not respond to Hg exposure by closing its shell and thus reducing uptake, as observed in other bivalves exposed to toxic compounds (Salanki et al, 2003;Kadar et al, 2002Kadar et al, , 2001Kontreczky et al, 1997). The mechanism of avoidance is explained by the ability of bivalves to respire anaerobically for prolonged periods, keeping their shells closed under stress, such as Hg-exposure (Devi, 1996), achieved in . Total Hg concentration in the pooled pseudofaeces of 20 mussels that were kept in seawater for 3·weeks (Control), then exposed daily to 20·µg·l -1 inorganic Hg for 3·weeks (Exposure), followed by transfer to Hg-free seawater for a further 3 weeks (Recovery).…”

Section: Discussionmentioning

confidence: 93%