The osmotic function of amino acids and taurine in the mussel, Mytilus edulis

Lange, R.

doi:10.1016/0010-406x(63)90239-1

Cited by 137 publications

(29 citation statements)

References 7 publications

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“…Except for studies concerned with the osmotic function of specific amino acids such as taurine and aspartate (Lange 1963;Hammen 1968), most studies have quantified amino acids as total amino N excretion (Pandian 1975;Bayne and Scullard 1977). For some groups such as molluscs, this fraction could amount to as much as 35% of their total excreted nitrogenous material (Pandian 1975).…”

Section: Discussionmentioning

confidence: 99%

Amino acid and ammonium utilization by heterotrophic marine bacteria grown in enriched seawater

Tupas

Koike

1990

Limnology & Oceanography

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The nitrogen metabolism of natural bacterial assemblages was studied in seawater cultures enriched with the dissolved materials released by the mussel Myths edulis. The mussel released dissolved organic C, NH,', and dissolved organic N (DON), mostly in the form of combined amino acids (-70-100%) that constituted 30% of the total N released. lsNH4+ techniques showed that the contribution of NH,+ to total microbial N demand during growth ranged from 50 to 88% even when large amounts of DON were utilized (-70-260% of total bacterial N produced). An average of 80% of the DON used was converted to NH,+, showing simultaneous assimilation and regeneration of NH,+ by the natural microbial population and contradicting the idea that NH,' assimilation occurs only when organic N is limiting.

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Section: Discussionmentioning

confidence: 99%

Amino acid and ammonium utilization by heterotrophic marine bacteria grown in enriched seawater

Tupas

Koike

1990

Limnology & Oceanography

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“…Like many marine invertebrates, crustaceans maintain high FAA concentrations within their cells for osmoregulation (Lange 1963) and alterations in the FAA profiles of muscles occur in various parasitic infections (Vivares et al 1980, Findley et al 1981. The total FAA concentration reported in this study for the DAF muscle of uninfected Nephrops norvegicus is comparable to that reported for the same species by Robertson et al (1992), considering that proline, which was found by Robertson (1961) to be high in N. norvegicus muscle, was not derivatized using OPT in this study.…”

Section: Discussionmentioning

confidence: 99%

Alterations in the biochemistry and ultrastructure of the deep abdominal flexor muscle of the Norway lobster Nephrops norvegicus during infection by a parasitic dinoflagellate of the genus Hematodinium

Stentiford¹,

Neil²,

Coombs³

2000

Dis. Aquat. Org.

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Changes in various biochemical and ultrastructural characteristics of the deep abdominal flexor (DAF) muscles were studied in Norway lobster Nephrops norvegicus (L.) from the Clyde estuary, Scotland, UK, at different stages of infection by a parasitic dinoflagellate of the genus Hematodinium. Abdominal DAF muscles from infected lobsters showed slight, significant increases in total water content, along with greatly depleted glycogen reserves and an altered free amino acid profile. However, protein concentration and composition remained unchanged. Ultrastructurally, parasitic infection of DAF muscle fibres caused alterations in sarcolemmal structure, and localized disruption of myofibrillar bundles around the periphery, but not throughout the centre of the fibres. Overall, the reduction in swimming performance previously reported for N. norvegicus during Hematodinium infection reflect an alteration in carbohydrate supply to the active muscle and some subtle disruption of muscle structure. The altered carbohydrate titre could reflect the Hematodinium parasites acting as a carbohydrate sink in the haemolymph, a disruption of normal tissue glycogenesis, or some alteration in the host's hormonal regulation. These changes could also adversely affect the taste, texture and marketability of infected meat.KEY WORDS: Abdominal muscle · Free amino acids · Glycogen · Hematodinium · Nephrops norvegicus · Protein · SDS-PAGE · Water contentResale or republication not permitted without written consent of the publisher

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“…Gly, Ala, and Ser are main constituents of (vertebrate) metallothioneins as well (Kagi and Nordberg, 1979). The molar concentration of the intracellular F M pool follows salinity changes, and a characteristic osmotically active substance in many molluscs, including M. edulis, is the amine taurine (Lange, 1963;Bricteux-Gregoire et al, 1964;Gilles, 1972;review: Gilles, 1975). It has been confirmed for blue mussels that Cys, the characteristic element of the thioneins, is the metabolic precursor of taurine (Allen and Awapara, 1960).…”

Section: Metabolic Interactions?mentioning

confidence: 99%

Shell weight as an independent variable in relation to cadmium content of mollusks

Fischer¹

1983

Mar. Ecol. Prog. Ser.

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Shell weight of molluscs is introduced as alternative parameter for biological monitoring of heavy metals. Variability of metal concentration due to variations in soft-body weight can be eliminated by relating metal body burden to shell weight. A reformed 'Mussel Watch' concept IS outlined. Detailed investigation of Cd in mussels exemplifies advantages of the new approach. The relation of Cd body burden to shell weight is constant in relation to environmental Cd concentration. In contrast, conventional Cd concentration values of soft tissues, in general, are related to the physical condition of mussels. The dependency of condition and Cd concentration on individual size, tidal exposure, spawning, and nutrient supply is documented. Accumulation of Cd in soft tissues and formation of the calcareous shell are discussed in terms of influx of environmental ions and organismic immobilisation, together with their respective organic ligands.

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The osmotic function of amino acids and taurine in the mussel, Mytilus edulis

Cited by 137 publications

References 7 publications

Amino acid and ammonium utilization by heterotrophic marine bacteria grown in enriched seawater

Amino acid and ammonium utilization by heterotrophic marine bacteria grown in enriched seawater

Alterations in the biochemistry and ultrastructure of the deep abdominal flexor muscle of the Norway lobster Nephrops norvegicus during infection by a parasitic dinoflagellate of the genus Hematodinium

Shell weight as an independent variable in relation to cadmium content of mollusks

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