نتایج جستجو برای: pinctada radiate
تعداد نتایج: 2073 فیلتر نتایج به سال:
The pearl oyster, “Pinctada radiate”, is a native species of Persian Gulf area, which has always been attractive for its ability of producing pearl. Thus, studying the gonadal maturation of the pearl oyster has been important for nucleus implantation to pearl production. In this study, samples were taken in winter and spring from Lavan and Kish Islands. The classic histological methods were use...
Atmospheric carbon dioxide concentrations have greatly increased since the beginning of the industrial age. This has led to a decline in global ocean pH by 0.1 units, and continued decline of 0.3–0.5 units is predicted by the end of 2100. Acidification of the ocean has led to decreased calcification rates and dissolution of calcareous structures in a range of marine species. Shells of the pearl...
The pearl oyster Pinctada fucata is a commercially important marine shellfish. As a result, genetic improvement and selective-breeding program have been conducted for this species. Polymorphic microsatellites are effective molecular markers to investigate molecular marker-assisted selection and genetic variance. In this study, microsatellite DNAs were screened and characterized based on the par...
Nacre, the iridescent material found in pearls and shells of molluscs, is formed through an extraordinary process of matrix-assisted biomineralization. Despite recent advances, many aspects of the biomineralization process and its evolutionary origin remain unknown. The pearl oyster Pinctada fucata martensii is a well-known master of biomineralization, but the molecular mechanisms that underlie...
The family Pteriidae (Bivalvia: Pterioida), which includes the group of species known as “pearl oysters” comprises three genera, namely Pteria Scopoli, 1777, Pinctada röding, 1798 and electroma Stoliczka, 1871 (CLEMAM, 2008). This family is represented by three species (Pteria hirundo (Linné, 1758); Pinctada radiata (Leach, 1814) and electroma vexillum (Reeve, 1857)) in the Mediterranean accord...
“It is tiresome and even humbling for the observer to be thus fettered, to be obliged to carry with him everywhere the centre of the landscape he is crossing. But what happens when chance directs his steps to a point of vantage (a cross-roads, or intersecting valleys) from which, not only his vision, but things themselves radiate? In that event the subjective viewpoint coincides with the way th...
Abstract Gibbons and Hawking ( Phys. Rev. D , 15 (1977) 2738) have shown that the horizon of de Sitter space emits radiation in same way as event black hole. But actual cosmological horizons are not horizons, except space. Nevertheless, this paper proves Gibbons' Hawking's formula an exact result for any flat expanding with strictly positive Hubble parameter. The gives visual intuitive insight ...
Pteriid oysters (Pinctada maxima, Pinctada margaritifera, Pinctada albina, Pteria penguin), rock oysters (Saccostrea glomerata, Saccostrea cuccullata, Saccostrea echinata) and representatives of other taxa (Malleidae, Isognomonidae, Pinnidae, Mytilidae, Spondylidae, Arcidae) from the wild, and 4670 hatchery-reared P. maxima, from northern and Western Australia, were examined for parasites and d...
Age validation is the first step to determine shellfish species age determination. This information is vital for different inferential models used in marine ecosystem management activities. In spite that various validation techniques are used for marking carbon calcium structures, the calcein marking technique for oysters had never been used for age validation in Pinctada mazatlanica. Thus the ...
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