Assessment of Different Soft Tissues of the Green-lipped Mussel Perna viridis (Linnaeus) as Biomonitoring Agents of Pb: Field and Laboratory Studies

2004 ◽  
Vol 153 (1-4) ◽  
pp. 253-268 ◽  
Author(s):  
C. K. Yap ◽  
A. Ismail ◽  
S. G. Tan ◽  
A. Rahim Ismail
Keyword(s):  
Soft Tissues ◽  
Perna Viridis ◽  
Laboratory Studies ◽  
Different Soft Tissues

scholarly journals An Assessment of the Bivalve Perna viridis, as an Indicator of Heavy Metal Contamination in Paradise Point of Karachi, Pakistan

2016 ◽  
Vol 59 (3) ◽  
pp. 164-171
Author(s):  
Rashida Qari ◽  
Olufemi Ajiboye ◽  
Saima Imran ◽  
Abdul Rahim Afridi
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Contamination ◽  
Soft Tissues ◽  
Heavy Metal Contamination ◽  
Human Consumption ◽  
Perna Viridis ◽  
High Accumulation ◽  
Accumulation Of Metals ◽  
Mn Concentrations

The edible bivalves Perna viridis (green mussel), (n = 100) were analysed for their total Hg,Pb, Cu, Ni, Zn, Co, Fe, Cr, Cd, and Mn concentrations to indicate heavy metal contamination in ParadisePoint of Karachi coast using atomic absorption spectrophotometer. There are large seasonal variations inthe metal concentrations of Mn (0.025-0.67 µg/g), Fe (0.055-7.740 µg/g), Ni (0.004-0.52 µg/g), Hg (0.0001-0.004 µg/g), Zn (0.04-3.32 µg/g), Cu (0.008-1.66 µg/g), Pb (0.022-2.43 µg/g), Co (0.01-0.044 µg/g), Cd(0.04-0.88 µg/g) and Cr (0.13-1.20 µg/g) recorded in bodies/soft tissues of P. viridis obtained in the samplesof the year 1993 and 2012 at the Paradise Point of Karachi coast. The results of heavy metals are in thefollowing descending order of concentration in the samples collected in the year 1993: Fe>Cr>Zn>Mn>Pb>Cd>Cu>Ni>Co>Hg, while Fe>Zn>Pb>Cu>Cr>Cd>Mn>Ni>Co>Hg order was recorded in samplescollected in the year 2012. The high accumulation of metals was found mostly in the samples collectedin the year 2012 when compared with the samples of the year 1993. This is an indication that the areaunder study showed signs of being exposed to significant levels of heavy metal pollution due to directdischarge of industrial and domestic wastes along the coast. The concentrations of these heavy metals werelower than the permissible limits for human consumption. However, if this pollution persists, it can proveto be very detrimental in future.

Seasonal Variations of Heavy Metals in the Bivalve’s mollusks from Ta-Peng Bay Lagoon in Southwestern Taiwan

2012 ◽  
Vol 599 ◽  
pp. 100-103
Author(s):  
Meei Fang Shue ◽  
Jen Jeng Chen ◽  
Li Ho Tseng ◽  
Wen Liang Lai
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Seasonal Variations ◽  
Soft Tissues ◽  
Metal Species ◽  
Perna Viridis ◽  
Significant Discrepancy ◽  
Aquatic Product ◽  
High Concentrations ◽  
Cd Species

Ta-Peng Bay lagoon in southwestern coast of Taiwan belonging to a shallow, productive, coastal lagoon was heavily polluted by the effluent of agriculture from fisheries and domestic sewage. This area provided a plentiful bivalves mollusks for regional market, including Anadara antiquate, Katelysia hiantina, Perna viridis and Anomalocardia squamosa. For understanding correlation between heavy metals existed in aquatic product and variation of heavy metal varied with season, during Dec., 2005- Sep., 2006, six heavy metals, such as Cu, Zn, Pb, Ni, Cr and Cd were analyzed by an air-acetylene flame / Graphite Atomizer atomic absorption spectrophotometer. The variations of different heavy metals existed in aquatic product in season were evaluated using multivariate analysis. Results show that the mean concentration of heavy metal in soft tissues for six aquatic products, Cd species had the lowest value than the others, and Cu and Zn were significantly higher than the other elements. The relationships of all heavy metal species in seasonal variations showed significant dependence. High concentrations of heavy metals were observed in winter. The negative correlation coefficient (p < 0.05) between heavy metals content and season variations statistically revealed decreased with season series for Ni, Pb, and Cr. An interesting finding that Cd bioaccumulation among the species had a significant discrepancy was observed. It means that bivalves mollusks could be develped as a potetial tool for monitoring Cd species.

scholarly journals Effects of animal size and nutritional status on the RNA/DNA ratio in different tissues of the green-lipped mussel Perna viridis

2011 ◽  
Vol 93 (1) ◽  
pp. 217-225 ◽  
Author(s):  
Jamius W.Y. Yeung ◽  
Kenneth M.Y. Leung
Keyword(s):  
Nutritional Status ◽  
Adductor Muscle ◽  
Health Condition ◽  
Tissue Type ◽  
Perna Viridis ◽  
Laboratory Studies ◽  
Short Term ◽  
General Health Condition ◽  
Animal Size ◽  
Hong Kong Waters

This study aimed to examine the responses of RNA/DNA ratio in Perna viridis under different nutritional status via both field and laboratory studies, and hence evaluate the usefulness of this ratio as a rapid growth biomarker in the mussels. First, the effects of size (small: 30–40 mm; medium: 40–50 mm; large: >50 mm) and tissue type (adductor muscle, foot, gill and hepatopancreas) on the RNA/DNA ratio were investigated in P. viridis collected from three different sites with different degrees of eutrophication in Hong Kong waters. Across all sizes, the mussels collected from a fairly ‘eutrophic’ mariculture zone had significantly higher RNA/DNA ratios in their gills than those from the other two relatively clean sites. The RNA/DNA ratio in small mussels was generally higher than in medium and large individuals, though such a size effect significantly interacted with tissue type and site. Second, we conducted a 10-day comparative laboratory study to elucidate the influence of starvation and feeding on the RNA/DNA ratio in the mussels. We observed that both hepatopancreas and foot muscle generally exhibited significant and rapid response to such a short-term starvation or food addition. The present results confirmed that the RNA/DNA ratio in P. viridis is a sensitive biomarker to gauge their growth and general health condition in accordance with food availability and/or eutrophication condition.

Clinical and Laboratory Experience with the use of Titanium and Titanium Type 318 Alloy for Bone and Joint Replacement

1985 ◽  
Vol 55 ◽  
Author(s):  
Keith W. J. Wright
Keyword(s):  
Joint Replacement ◽  
Soft Tissues ◽  
Pure Titanium ◽  
Fatigue Properties ◽  
Clinical Effects ◽  
Commercially Pure Titanium ◽  
Laboratory Studies ◽  
Cocrmo Alloy ◽  
Metallic Material ◽  
Clinical Complications

ABSTRACTCommercially pure titanium type T5 and titanium type TAl alloy have been used at Stanmore in major bone and joint replacement prostheses since 1963 and 1971 respectively. Because laboratory studies indicated cast CoCrMo alloy to be a superior bearing material both titanium materials have been joined to cast CoCrMo alloy bearing elements to form composite prostheses with no apparent adverse clinical effects.Laboratory studies and clinical experience have shown the inadequacy of the fatigue properties of titanium type T5 and cast CoCrMo alloy for highly stressed intramedullary stems. Nevertheless, although titanium type TAl alloy has superior fatigue properties highly stressed components of this material are not immune to fatigue failure.Wear of U.H.M.W.P.E. appears to be greater when articulated with titanium type TAI alloy than it is when articulated with cast CoCrMo alloy and Al2O3 counterfaces. In addition, capsular tissue which rubs on titanium type TAl alloy can become heavily pigmented. However, to date no clinical complications appear to have resulted from either of these shortcomings. Whether a surface treatment for titanium type TAl alloy such as ion implantation will both improve its wear characteristics with U.H.M.W.P.E. and reduce the amount of metallic material liberated into the soft tissues has yet to be established.

scholarly journals Comparative performance of the mussels Perna perna and Perna viridis, cultivated at four different depths

2016 ◽  
Vol 64 (3) ◽  
pp. 249-262 ◽  
Author(s):  
Marielyn García ◽  
César Lodeiros Seijo ◽  
Luis Freites ◽  
Henry Córdova ◽  
José Manuel Mazón Suástegui ◽  
...  
Keyword(s):  
Shell Length ◽  
Soft Tissues ◽  
Environmental Variability ◽  
Growth Parameters ◽  
Survival Rates ◽  
Perna Viridis ◽  
Perna Perna ◽  
Comparative Performance ◽  
Growth And Survival ◽  
Inorganic Matter

Abstract This study aims to evaluate the effect of environmental variability on the growth and survival of the subtropical and tropical mussels Perna perna and Perna viridis at four different culture depths in the Gulf of Cariaco during an annual cycle. Juveniles of P. perna (39.1±1.88 mm in shell length) and P. viridis (36.7±1.87 mm) were sown on nylon ropes (3/4") and suspended from a raft at 1, 3, 6 and 9 m depths. Every six weeks, three replicates of each species were sampled (10 individuals per replicate) at each depth. Growth parameters were determined: mass and shell length, dry mass of soft tissues as well as fouling and survival rates. Temperature, transparency, chlorophyll a, oxygen, salinity and particulate organic and inorganic matter were recorded at each culture depth for the purpose of relating growth and survival to environmental change. The results show that the growth of both species was linked to the environment, especially with regard to the influence of the food and temperature. A period of stagnant growth of P. perna was associated with the higher temperature and lower phytoplankton biomass that is characteristic of the season with prevalent water column stratification (August-November 2007). By contrast, the growth of P. viridis did not stagnate, although it was gradual and relatively lower. At the end, P. perna achieved higher growth rates than P. viridis. Possible culture strategies to improve the production of both mussel species are discussed.

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