| occurrence of vibrio parahaemolyticus in selected marine invertebrates, sediment, and seawater around alexandria, egypt. | samples of seawater, sediment, and the following invertebrates were collected from the mediterranean sea in the neighborhood of alexandria, egypt: sea urchins (echinus spp.), clams (tapes spp.), and wedge shells (donax trunculus). a total of 165 samples were collected from november 1979 to july 1980. average counts (per 100 ml or 100 g) of vibrio parahaemolyticus content were as follows: seawater, 36; sea urchins, 349; sediment, 436; wedge shells, 534; clams, 1872. samples collected in the summe ... | 1982 | 7151020 |
| study of paralytic shellfish poisoning toxin profile in shellfish from the mediterranean shore of morocco. | since 1992, a monitoring program for bivalve molluscs contaminated by algal toxins was established at different stations along the mediterranean moroccan shores. the monitored stations were tested every 2 weeks. the presence of toxicity was determined using the mouse bioassay method. toxin profile was carried out by hplc/fd in selected contaminated tissues. according to the outcomes of this surveillance from 1994 to 1999, reliable information on toxicity of shellfish was obtained. they indicate ... | 2001 | 11600148 |
| pectenotoxin-2 seco acid, 7-epi-pectenotoxin-2 seco acid and pectenotoxin-2 in shellfish and plankton from portugal. | pectenotoxin-2 seco acid (ptx2sa) and 7-epi-pectenotoxin-2 seco acid (7-epi-ptx2sa) were found in portuguese shellfish both by fluorescence detection after adam derivatisation and, liquid chromatography coupled with mass spectrometry detection. two time-series both with blue mussel (mytilus edulis) and common cockle (cerastoderma edule) from aveiro lagoon illustrate how ptx2sa has a strong association with dinophysis acuta occurrence in the plankton, as well as dinophysis fortii. data so far exc ... | 2002 | 12076652 |
| heavy metal concentrations in molluscs from the atlantic coast of southern spain. | trace metals were determined in the two most abundant species of bivalve molluscs along the atlantic coast of southern spain (donax trunculus and chamelea gallina) and in the sediments where they live. the results show that the area near the mouth of the huelva estuary is where the highest metal concentrations are found in sediments and in the two bivalve species. this is not surprising, considering that the huelva estuary is the mouth of the tinto and odiel rivers, which have one of the highest ... | 2005 | 15833492 |
| depuration times of donax trunculus and tapes decussatus. | the present study was performed to determine the depuration time and ability of donax trunculus (wedge clam) and tapes decussatus (carpet shell) contaminated with escherichia coli, salmonella enterica subsp. enterica serovar typhimurium and vibrio parahaemolyticus. clams were contaminated with each bacterium at the level of 7.0 - 8.0 log10 cfu/g. after contamination, clams were analyzed every 3 h in the first 24 h time period and every 6 h until the 72nd hour. during the depuration process of bo ... | 2014 | 25477938 |
| microbial hazard of salted om el-kholoul (wedge shell donax trunculus). | sixty samples of salted om el-kholoul were collected from different localities in giza, alexandria and ismailia. the samples were examined organoleptically and bacteriological examination of samples were performed for enumeration of aerobic, enterobacteriaceae, staph. aureus, enterococci counts as well as isolation and identification of vibrio parahaemolyticus. the mean counts/gm of aerobes, enterobacteriaceae, staph. aureus, strept. faecalis and strept. faecum were 4.9 x 10(5), 4.8 x 10(4), 1.9 ... | 1998 | 9529997 |
| bacciger bacciger (trematoda: fellodistomidae) infection effects on wedge clam donax trunculus condition. | wedge clams donax trunculus inhabit high-energy environments along sandy coasts of the northeastern atlantic ocean and the mediterranean sea. two sites were sampled monthly, one in morocco (mehdia), where the density was normal, and one in france (biscarosse), where the density was very low. we tested the hypothesis that the difference in density between the sites was related to infection by the trematode parasite bacciger bacciger. identity of both the parasite and the host were verified using ... | 2014 | 25320038 |
| implications for management and conservation of the population genetic structure of the wedge clam donax trunculus across two biogeographic boundaries. | in a resource management perspective, the understanding of the relative influence of the physical factors on species connectivity remains a major challenge and is also of great ecological and conservation biology interest. despite the overfishing threat on the wedge clam donax trunculus in europe, relatively little information is known about its population genetic structure and connectivity and their consequences on conservation policies. we employed 16 microsatellite loci to characterise the ge ... | 2016 | 27991535 |
| tandem repeat-containing mites in the clam donax trunculus. | two distinct classes of repetitive sequences, interspersed mobile elements and satellite dnas, shape eukaryotic genomes and drive their evolution. short arrays of tandem repeats can also be present within nonautonomous miniature inverted repeat transposable elements (mites). in the clam donax trunculus, we characterized a composite, high copy number mite, named dtc84. it is composed of a central region built of up to five core repeats linked to a microsatellite segment at one array end and flank ... | 2013 | 24317975 |
| metal levels in economically important bivalve species from turkey. | concentrations of eight heavy metals (as, cd, cr, cu, hg, ni, pb and zn) were determined in economically important bivalve species: oyster (ostrea edulis), wedge clam (donax trunculus), manila clam (ruditapes philippinarium) and warty clam (venus verrucosa) from the marmara and aegean seas. samples were collected seasonally between 2008 and 2009. metal levels of bivalves were found in the following ranges: as 0.02-3.40, cd 0.02-2.80, cr 0.19-0.82, cu 0.82-25.06, hg < lod-0.12, ni 0.09-0.73, pb 0 ... | 2012 | 24786409 |
| management of domoic acid monitoring in shellfish from the catalan coast. | monitoring of amnesic shellfish poisoning (asp) toxins in shellfish from the catalan coast started in 2001. no asp toxins were detected in any of the analyses performed before 2008. on 22 january 2008, domoic acid (da) was detected in donax trunculus (0.5 mg kg(-1)) and confirmed by rapid resolution liquid chromatography-tandem mass spectrometry (0.6 mg kg(-1)). a total of 974 shellfish samples were analyzed from january 2008 to december 2011, covering all the catalan production areas and the mo ... | 2013 | 23275095 |
| characterization of pathogenic vibrios isolated from bivalve hatcheries in galicia, nw atlantic coast of spain. description of vibrio tubiashii subsp. europaeus [corrected] subsp. nov. | the taxonomic position of the bivalve pathogen pp-638 was studied together with five similar isolates. the strains were isolated from flat oyster (ostrea edulis) and manila clam (venerupis philippinarum) cultures during outbreaks of disease in two shellfish hatcheries (galicia, nw spain). the pathogenicity, previously established for pp-638, was demonstrated with all isolates and for several bivalve species, including the original hosts. on the basis of phenotypic characterization and 16s rrna g ... | 2015 | 25555343 |
| vibrio bivalvicida sp. nov., a novel larval pathogen for bivalve molluscs reared in a hatchery. | three isolates were obtained from cultures of carpet shell clam (ruditapes decussatus) reared in a bivalve hatchery (galicia, nw spain) from different sources: healthy broodstock, moribund larvae and the seawater corresponding to the larval tank. all isolates were studied by a polyphasic approach, including a phylogenetic analysis based on concatenated sequences of the five housekeeping genes ftsz, gyrb, pyrh, reca and rpoa. the analysis supported their inclusion in the orientalis clade of the g ... | 2016 | 26654527 |
| molecular cytogenetics in digenean parasites: linked and unlinked major and 5s rdnas, b chromosomes and karyotype diversification. | digenetic trematodes are the largest group of internal metazoan parasites, but their chromosomes are poorly studied. although chromosome numbers and/or karyotypes are known for about 300 of the 18,000 described species, molecular cytogenetic knowledge is mostly limited to the mapping of telomeric sequences and/or of major rdna clusters in 9 species. in this work we mapped major and 5s rdna clusters and telomeric sequences in chromosomes of bucephalus minimus, b. australis, prosorhynchoides carva ... | 2015 | 26680763 |
| fine structure and histochemistry of the gastric shield in the lamellibranch donax trunculus l. | the histochemical observations performed by the authors on the stomach wall of donax trunculus are not wholly in agreement with the results of workers on other bivalves. the ultrastructure of the gastric shield and underlying cells was therefore, studied. it was confirmed that the epithelial cells contain glycogen granules at the base. in addition two distanct p.a.s. positive inclusions were identified: lysosomal residual bodies and neutral mucopolysaccharidic inclusions. the gastric shield is c ... | 2003 | 224608 |
| bioinformatics tools help molecular characterization of perkinsus olseni differentially expressed genes. | in the 80ies, in southern europe and in particular in ria formosa there was an episode of heavy mortality of the economically relevant clam ruditapes (r.) decussatus associated with a debilitating disease (perkinsosis) caused by perkinsus olseni. this protozoan parasite was poorly known concerning its' differential transcriptome in response to its host, r. decussatus. this laboratory available protozoan system was used to identify parasite genes related to host interaction. beyond the applicatio ... | 2011 | 21926442 |
| source and impact of lead contamination on δ-aminolevulinic acid dehydratase activity in several marine bivalve species along the gulf of cadiz. | coastal areas and estuaries are particularly sensitive to metal contamination from anthropogenic sources and in the last few decades the study of space-time distribution and variation of metals has been extensively researched. the gulf of cadiz is no exception, with several rivers draining one of the largest concentrations of sulphide deposits in the world, the iberian pyrite belt (ipb). of these rivers, the guadiana, one of the most important in the iberian peninsula, together with smaller rive ... | 2010 | 20965582 |
| comparison of diagnostic techniques to detect the clam pathogen perkinsus olseni. | perkinsosis in clams in galicia (nw spain) is caused by the protozoan parasite perkinsus olseni lester & davis, 1981. we used 5 clam species of commercial interest cultured in galicia (ruditapes decussatus, r. philippinarum, venerupis pullastra, v. rhomboides, and donax trunculus) to compare various p. olseni diagnostic techniques. results of a nested pcr assay for the diagnosis of p. olseni were compared to those obtained using 2 classical methods of diagnosis proposed by the world organisation ... | 2010 | 20662371 |
| metabolites of saxitoxin analogues in bivalves contaminated by gymnodinium catenatum. | bivalve metabolites of saxitoxin analogues, not present in microalgae, were recently described as an important toxin fraction in mussels contaminated by alexandrium tamarense. these possess very low fluorescence, and require mass spectrometry detection. hilic-ms was implemented to look for these metabolites in bivalves contaminated during gymnodinium catenatum blooms at the portuguese coast. the presence of m1 was tentatively identified in several bivalves, ranging from estuarine (mytilus gallop ... | 2010 | 19622366 |
| seasonal variations in the macronutrient mineral and proximate composition of two clams (chamelea gallina and donax trunculus). | two bivalve's species (chamelea gallina and donax trunculus) were investigated in terms of proximate and mineral compositions (sodium, potassium, magnesium, calcium, iodine and selenium) throughout the year. the concentrations of minerals were determined using inductively coupled plasma mass spectrometry. ranges of moisture, protein, fat, ash and carbohydrate contents were 82.70-86.57%, 6.86-8.99%, 0.58-1.20%, 2.44-2.95% and 2.70-4.50% for c. gallina, and were 81.09-85.55%, 8.13-10.61%, 0.69-1.3 ... | 2008 | 18925478 |
| biomonitoring study of heavy metals in biota and sediments in the south eastern coast of mediterranean sea, egypt. | concentrations of cd, cu, co, zn, mn and fe were determined in biota and sediment samples collected from the eastern harbour and el-mex bay in the mediterranean sea, egypt. the levels of cu, co, zn, mn and fe in the macroalgae, ulva lactuca, enteromorpha compressa (green algae) and jania rubens (red algae), recorded high concentrations except for cd. moreover, fe was the most predominant metal in the seaweed. the two species of bivalves, donax trunculus and paphia textile, showed different amoun ... | 2008 | 18074236 |
| detailed profiles of 7-o-acyl esters in plankton and shellfish from the portuguese coast. | in bivalve mollusks from the portuguese coast contaminated by diarrhetic shellfish poisoning (dsp), most of the parent toxins, okadaic acid (oa) or dinophysistoxin-2 (dtx2), are found esterified, and toxicity assessment is only performed after an alkaline hydrolysis step to recover the parent molecules in their free form. the presence of 7-o-acyl esters with fatty acids (fas) has already been confirmed previously in mytilus galloprovincialis and donax trunculus samples. this paper reports the pr ... | 2006 | 16860331 |
| organochlorine compounds (pcbs, pcdds and pcdfs) in seafish and seafood from the spanish atlantic southwest coast. | concentrations and congener specific profiles of pcdd/fs and pcbs were determined in edible fish and seafood species from the coast of huelva, in the spanish southwest atlantic coast. five fish species, namely wegde sole (dicologoglossa cuneata), common sole (solea vulgaris), white seabream (diplodus sargus), sardine (sardina pilchardus), angler fish (lophius piscatorius), two shellfish species (donax trunculus and chamelea gallina), common cuttlefish (sepia officinalis) and prawns (parapenaeus ... | 2006 | 16483635 |
| differential dynamics of dinophysistoxins and pectenotoxins, part ii: offshore bivalve species. | different dinophysistoxin's profiles have been found repeatedly amongst some offshore bivalve molluscs. species such as the clam, spisula solida, esterify dinophysistoxins to a great extent, and contain always more okadaic acid (oa) than dinophysistoxin-2 (dtx2). in contrast, the clam donax trunculus has a much higher percentage of non-esterified toxins, and often contains more dtx2 than oa. a detoxification experiment with d. trunculus and s. solida showed that the higher percentage of dtx2 in ... | 2006 | 16321414 |
| guidelines for routine mercury speciation analysis in seafood by gas chromatography coupled to a home-modified afs detector. application to the andalusian coast (south spain). | a home-modified atomic fluorescence detector (mafs) has been employed for mercury and methylmercury determination in bivalves from the andalusian coast (south spain). this modification consists on the inclusion of a quartz flow cell into the detector, which increases the concentration of mercury atoms in the detector and therefore enhances sensitivity about two fold. two analytical approaches for mercury speciation based on the coupling of gas chromatography on-line pyrolysis and mafs (gc-pyro-m ... | 2005 | 15990151 |
| heavy metals monitoring using bivalves from mediterranean sea and red sea. | the concentrations of heavy metals (cd, co, cu, fe, mn, ni, pd and zn) were measured in the bivalves (modiolus auriculatus and donax trunculus) collected from the egyptian coasts of mediterranean sea and brachiodonates sp. from the egyptian coasts of red sea. the average concentrations of the heavy metals analyzed exhibited the following decreasing order: fe > zn > cu > mn > ni > co > pb > cd for both mediterranean sea and red sea. the analyses of cd, co, ni, pb, and zn showed higher average con ... | 2004 | 15473528 |
| human pathogenic protozoa in bivalves collected from local markets in alexandria. | bivalves are filter feeders concentrating pathogens from waters and are often eaten raw. two species, caelatura iaronia pruneri and donax trunculus limiacus commonly known as gandofli and om el kholool respectively were examined. shellfish were collected from markets in alexandria to detect any human pathogenic protozoa in them. the infectivity of the detected protozoa was studied by experimental animal inoculation. the results revealed the presence of infectious cryptosporidia oocysts and micro ... | 2003 | 14708868 |
| esters of okadaic acid and dinophysistoxin-2 in portuguese bivalves related to human poisonings. | liquid chromatography (hplc) was used to search for esters of dsp toxins in portuguese bivalves. hexane-soluble derivatives of okadaic acid (oa) and dinophysistoxin-2 (dtx-2) were found. presumably they are acyl derivatives, globally known as 'dinophysistoxin-3' (dtx-3). in certain instances dtx-3 content surpassed 50% of the total amount of dsp toxins. a human diarrhetic poisoning (dsp) incident with donax clams (donax trunculus) harvested at fuzeta (algarve coast) was confirmed where the apola ... | 1999 | 10400295 |
| characterization of nineteen microsatellite markers and development of multiplex pcrs for the wedge clam donax trunculus (mollusca: bivalvia). | the wedge clam donax trunculus is an atlantic-mediterranean warm-temperate species found from senegal to the northern coast of france, including the mediterranean and black sea. it is commercially exploited in several european countries and constitutes an important fishing resource due to its high economical value. to contribute to its conservation and management, nineteen microsatellite markers were isolated from two enriched genomic libraries. these loci were characterized in 30 clams from a s ... | 2014 | 24852303 |
| postmonorchis sp. inq. (digenea: monorchiidae) metacercariae infecting natural beds of wedge clam donax trunculus in italy. | the wedge clam donax trunculus linnaeus, 1758 is one of the most common bivalve molluscs inhabiting the sandy shores of the mediterranean sea and is considered an important commercial resource. in this study, we report the first molecular, morphological and histopathological descriptions of metacercariae from a trematode belonging to the genus postmonorchis (digenea: monorchiidae) that infects d. trunculus in natural beds of the italian tyrrhenian coast (campania, lazio and tuscany). morphologic ... | 2013 | 24113249 |
| draft genome sequence of aeromonas molluscorum strain 848tt, isolated from bivalve molluscs. | we report here the draft genome sequence of aeromonas molluscorum 848t, the type strain of this aeromonas species, which was isolated from wedge shells (donax trunculus) obtained from a retail market in barcelona, spain, in 1997. | 2013 | 23788549 |
| is the reproduction of donax trunculus affected by their sites of origin contrasted by their level of contamination? | the reproductive cycle of bivalves is regulated by several natural environmental factors but exposure to chemical pollutants can also interfere and may result in advanced or delayed spawning season. to our knowledge, the gametogenic cycle of the suspension-feeder bivalve donax trunculus has not yet been used as biomonitoring tool in ecotoxicological surveys. the aim of this study was to examine over a year physiological reproductive endpoints (sex-ratio, gametogenic and energy reserve cycles) an ... | 2011 | 21624631 |
| esterification of okadaic acid in the mussel mytilus galloprovincialis. | okadaic acid and other toxins of the diarrheic shellfish poisoning (dsp) group are transformed mainly to their acyl-derivatives in bivalves. some recent studies suggest that bacteria present in the bivalve gut could contribute substantially to the acylation of the toxins. by feeding microcapsules containing okadaic acid to mussels we have shown unequivocally that the ingested okadaic acid is nearly completely transformed to its fatty acid esters (acyl-derivatives). treating mussels with antibiot ... | 2011 | 21329714 |
| profiles of paralytic shellfish toxins in bivalves of low and elevated toxicities following exposure to gymnodinium catenatum blooms in portuguese estuarine and coastal waters. | profiles of paralytic shellfish toxins (psts) were examined in 405 composite samples of mytilus spp., cerastoderma edule, donax trunculus and spisula solida collected between 2007 and 2012 from natural production areas in two estuaries (aveiro and mondego), two coastal lagoons (óbidos and formosa), and three open coastal areas (aguda, comporta and culatra). toxin concentrations were obtained from the biotoxin monitoring programme database. episodes of pst toxicity in portugal have been associate ... | 2015 | 25616737 |
| amphidoma languida (amphidomatacea, dinophyceae) with a novel azaspiracid toxin profile identified as the cause of molluscan contamination at the atlantic coast of southern spain. | azaspiracids (aza) are a group of food poisoning phycotoxins that are known to accumulate in shellfish. they are produced by some species of the planktonic dinophycean taxon amphidomataceae. azaspiracids have been first discovered in ireland but are now reported in shellfish from numerous global sites thus showing a wide distribution. in shellfish samples collected in 2009 near huelva (spain), aza was also found along the andalusian atlantic coast for the first time. analysis using lc-ms/ms reve ... | 2017 | 28118886 |
| linking changes at sub-individual and population levels in donax trunculus: assessment of marine stress. | research in ecotoxicology currently focuses to fill the gap existing between sub-organismal responses (e.g. biomarkers) to toxicants and effects occurring at higher levels of biological organisation (e.g. population). the intra-sedimentary bivalve donax trunculus commonly found in west atlantic and mediterranean coasts is a sentinel species useful for biomonitoring studies in sandy beaches. the objective of this work was to link responses at the infra-individual level (core biomarkers as early a ... | 2010 | 20728199 |
| comparison of the effects of pollution on the marine bivalve donax trunculus in the vicinity of polluted sites with specimens from a clean reference site (mediterranean sea). | the physiological and biochemical characteristics of tissue samples of the marine mussel, donax trunculus, from an oil-polluted site (qiryat yam) and from a site adjacent to an industrial factory (frutarom) producing polyvinyl chloride (pvc) were compared with samples from a clean reference site (akko). all sites were located along the sandy shores of the israeli mediterranean sea. the mussels from the oil-polluted site showed increased activity of the system of active transport of organic anion ... | 2010 | 19857878 |
| long-term conservation vs high sequence divergence: the case of an extraordinarily old satellite dna in bivalve mollusks. | the ubiquity of satellite dna (satdna) sequences has raised much controversy over the abundance of divergent monomer variants and the long-time nucleotide sequence stability observed for many satdna families. in this work, we describe the satdna biv160, characterized in nine species of the three main bivalve clades (protobranchia, pteriomorphia and heteroconchia). biv160 monomers are similar in repeat size and nucleotide sequence to satdnas described earlier in oysters and in the clam donax trun ... | 2010 | 19844270 |
| a gc-rich satellite dna and karyology of the bivalve mollusk donax trunculus: a dominance of gc-rich heterochromatin. | we characterized the dtf2 satellite dna family of the clam donaxtrunculus and compared its chromosomal localization with cytogenetic data revealed by fluorochrome banding, c-banding, and 28s rdna fish. in contrast to the other satellites detected previously in this species, dtf2 is an abundant (2%) gc-rich satellite that exhibits cpg methylation. sequence characteristics of dtf2 indicate that its evolution is not affected by constraints that might indicate some functional interactions. fluoresce ... | 2009 | 19372670 |
| the morphology and behaviour of cercaria lata lespés, 1857 (digenea, faustulidae) from the mediterranean clam tapes decussata (l.). | cercaria lata (digenea, faustulidae), discovered by lespés (1857) in tapes decussata (l.) in the basin of arcachon, was found for the first time, from the eastern mediterranean, in the same lamellibranch from tunisia (bizerte and tunis lagoons and gulf of gabes). these cercariae develop in daughter sporocysts, which develop in mother sporocysts in the gonads. daughter sporocysts are observed in the gonads and sometimes in the digestive gland. a redescription and the behaviour of the naturally em ... | 2009 | 19017425 |
| doubly uniparental inheritance (dui) of mitochondrial dna in donax trunculus (bivalvia: donacidae) and the problem of its sporadic detection in bivalvia. | mitochondrial dna is transmitted maternally in metazoan species. this rule does not hold in several species of bivalves that have two mtdna types, one that is transmitted maternally and the other paternally. this system of mitochondrial dna transmission is known as doubly uniparental inheritance (dui). here we present evidence of dui in the clam donax trunculus making donacidae the sixth bivalve family in which the phenomenon has been found. in addition, we present the taxonomic affiliation of a ... | 2008 | 18208565 |
| alkylphenols and polycyclic aromatic hydrocarbons in eastern mediterranean spanish coastal marine bivalves. | this paper reports the first results on alkylphenol pollution in edible bivalves from the spanish coast. two sampling campaigns (july 2006 and july 2007) were carried out to determine the concentration of nonylphenol (np), octylphenol (op), and eight polycyclic aromatic hydrocarbons (pahs) in wild mussels (mytilus galloprovincialys) and clams (donax trunculus) at 14 sampling sites along the eastern mediterranean spanish coast. the results show that np is the predominant alkylphenol, being the po ... | 2011 | 20568007 |
| protamines and related proteins from spermatozoa of molluscs. characterization and molecular weight determination by gel electrophoresis. | the spermatozoa of most species of molluscs contain a mixture of proteins with compositions related to those of histones and protamines. the various components present in the spermatozoa of cryptochiton stellerii, donax trunculus, mactra corallina and gibbula divaricata have been isolated and characterized. the results obtained, taken together with those previously found (subirana, j.a., cozcolluela, c., palau, j. and unzeta, m. (1973) biochim. biophys. acta 317, 364--379), show that in all the ... | 1979 | 518910 |
| [effects of industrial waste on a population of mollusco lamellibranco donax trunculus l]. | | 1977 | 911527 |
| effects of sublethal zn++ and cd ++ concentrations on filtration rate, absorption efficiency and scope for growth in donax trunculus (bivalvia; donacidae). | physiological parameters (filtration rate measured as clearance rate; absorption efficiency measured as conover index) and energy balance [scope for growth (sfg)] where determined under zn++ (essential metal) and cd++ (nonessential metal) at different concentration levels and timing. the toxic effect observed on donax trunculus was higher for cd++ than for zn++ in almost all the parameters studied. the sfg is proposed as an integrated environmental biomarker to be used like a tool with others fr ... | 2007 | 17999017 |
| characterization of the telomere regions of scleractinian coral, acropora surculosa. | terminal ends of vertebrate chromosomes are protected by tandem repeats of the sequence (ttaggg). first thought to be vertebrate specific, (ttaggg)( n ) has recently been identified in several aquatic invertebrates including sea urchin (strongylocentrotus purpuratus), bay scallop (argopecten irradians), and wedgeshell clam (donax trunculus). we analyzed genomic dna from scleractinian corals, acropora surculosa, favia pallida, leptoria phrygia, and goniastrea retiformis to determine the telomere ... | 2007 | 16897464 |
| sublethal effects of zn++ and cd++ on respiration rate, ammonia excretion, and o:n ratio of donax trunculus (bivalvia; donacidae). | | 2005 | 16385956 |
| sequence divergence and conservation in organizationally distinct subfamilies of donax trunculus satellite dna. | characterization of a low-copy number dtf1 satellite dna detected in the bivalve mollusk donax trunculus revealed extensive grouping of monomer sequence variants into subfamilies identified by distinctive combinations of diagnostic nucleotides. it can be anticipated that a large number of subfamilies exists in the genome. in addition to the tandem organization of 169 bp long monomers, at least one subfamily was created through amplification of adjacent repeats in a higher order register. this co ... | 2005 | 16216450 |
| study of donax trunculus as a sentinel species for environmental monitoring of sandy beaches on moroccan coasts. | | 2004 | 15389332 |
| effects of zinc and cadmium on the burrowing behavior, lc(50), and lt(50) on donax trunculus linnaeus (bivalvia-donacidae). | | 2003 | 12677382 |
| telomeric localization of the vertebrate-type hexamer repeat, (ttaggg)n, in the wedgeshell clam donax trunculus and other marine invertebrate genomes. | the hexamer repeat sequence (ttaggg)(n), found at the ends of all vertebrate chromosomes, was previously identified as the main building element of one member of a hindiii satellite dna family characterized in the genome of the bivalve mollusc donax trunculus. it was also found in 22 perfect tandem repeats in a cloned junction region juxtaposed to the proper satellite sequence, from which the dna tract encompassing the clustered tandem copies was excised and subcloned. here, the chromosomal dist ... | 2002 | 11907038 |
| characterization of interrelated sequence motifs in four satellite dnas and their distribution in the genome of the mollusc donax trunculus. | a family of four satellite dnas has been characterized in the genome of the bivalve mollusc, donax trunculus. all share hindiii sites, a similar monomer length of about 160 base pairs (bp), and the related oligonucleotide motifs ggtca and gggtta, repeated six to 15 times within the repetitive units. the motif ggtca is common to all members of the satellite family. it is present in three of them in both orientations, interspersed within nonrepetitive dna sequences. the hexanucleotide gggtta appea ... | 1997 | 9069179 |
| characterization of a complex satellite dna in the mollusc donax trunculus: analysis of sequence variations and divergence. | a highly repetitive sequence in the genomic dna of the bivalve mollusc donax trunculus (dt) has been identified upon restriction with ecorv. during the time-course of dna digestion, genomic fragments resolved electrophoretically into a ladder-like banding pattern revealing a tandem arrangement of the repeated elements, thus representing satellite dna sequences. cloning and sequence analysis unraveled the presence of two groups of monomer units which can be considered distinctive satellite subfam ... | 1996 | 8647440 |
| alkyllead species in the coastal waters of alexandria, egypt. | fourteen locations were sampled along the alexandria coast to assess the occurrence and fate of alkyllead compounds in water, sediments and biota. tetraalkyllead was not observed in any of the samples analyzed. pbme(3)(+) dominated the methyllead species in water (constituting 62-64% of total alkyllead) reaching 1506 ng kg(-1) opposite the alkyllead production plant. pbet(3)(+) dominated the ethyllead species constituting 18-20% of total alkyllead species with a maximum concentration of 902 ng k ... | 1996 | 15091456 |
| effect of heavy metals ions on enzyme activity in the mediterranean mussel, donax trunculus. | | 1989 | 2545296 |
| [the larval stages of meiogymnophallus strigatus (m. v. lebour, 1908) n. comb. (trematoda: gymnophallidae)]. | cercariae and metacercariae of meiogymnophallus strigatus (m. v. lebour, 1908) have been found in some places along the coast of camargue (south of france). sporocysts and cercariae are parasites of tellina tenuis. metacercariae occur in various bivalves, mainly in donax trunculus and d. semistriatus. cercariae and metacercariae are described. relationship between cercariae and metacercariae is demonstrated. metacercarial microhabitat is delimited. reaction of d. trunculus in front of the metace ... | 1983 | 6614743 |