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Side 1 fra 132 resultater
Proline inhibition of a sea anemone alarm pheromone response.
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1. L-proline, by itself or in animal tissue extracts, inhibits the response of the sea anemone Anthopleura elegantissima to the alarm phermone, anthopeurine. 2. The effect of proline is mediated by a receptor that is specific for the structure and configuration of the part of the L-proline molecule
Two complex proline esters from the sea hare Stylocheilus longicauda.
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Investigation of Stylocheilus longicauda led to the isolation of chlorinated metabolites, makalika ester (1) and makalikone ester (2). Also reported is the isolation of lyngbyatoxin A acetate (3). The structures of the new compounds are based on spectroscopic data obtained from 1D and 2D NMR
Structural comparison of cuticle and interstitial collagens from annelids living in shallow sea-water and at deep-sea hydrothermal vents.
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Two types of annelid collagens of different sizes were purified, one from acetic acid extracts of the cuticle (length 2.5 microns) and the other, after pepsin digestion, from interstitial spaces of the body wall (0.3 micron). They were obtained from Alvinella pompejana, Alvinella caudata and
Amino acid composition and endocrine control of vitelline envelope proteins in European sea bass (Dicentrarchus labrax) and gilthead sea bream (Sparus aurata).
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The vitelline envelopes of European sea bass and gilthead sea bream are both composed of mainly four proteins with the molecular masses of 90, 52, 48, 45 kDa and 75, 50, 48, 44 kDa, respectively. Each protein has an amino acid composition that is characterized by a high content of proline and
Collagen metabolism and spicule formation in sea urchin micromeres.
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The role of collagen or collagen-like protein(s) in the in vitro formation of the sea urchin embryonic skeleton was investigated using isolated micromeres of Strongylocentrotus purpuratus. Micromeres were cultured in sea water containing 4% horse serum on tissue culture plastic or an extracellular
The synthesis and secretion of collagen by cultured sea urchin micromeres.
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Circumstantial evidence in several previous studies has suggested that sea urchin embryo micromeres, the source of primary mesenchyme cells which produce the embryonic skeleton, contribute to the extracellular matrix of the embryo by synthesizing collagen. A direct test of this possibility was
[The effect of various proline analogues on the development of the sea urchin eggs of Paracentrotus lividus].
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Mechanisms of wavelength tuning in the rod opsins of deep-sea fishes.
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The main object of this study was to investigate the molecular basis for changes in the spectral sensitivity of the visual pigments of deep-sea fishes. The four teleost species studied, Hoplostethus mediterraneus, Cataetyx laticeps, Gonostoma elongatum and Histiobranchus bathybius, are
Degeneration of archenteron in sea urchin embryos caused by alpha,alpha'-dipyridyl.
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Degeneration of the archenteron in middle gastrulae occurred in the presence of alpha,alpha'-dipyridyl or Zn2+, inhibitors of prolyl hydroxylase. In the presence of these substances the archenteron degenerated and was eventually destroyed. Adding Fe2+ to the embryo culture containing
Oceanisphaera donghaensis sp. nov., a halophilic bacterium from the East Sea, Korea.
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A taxonomic study was carried out on two isolates, strains BL1(T) and BL11, from marine sediment collected from the East Sea, Korea. Comparative 16S rRNA gene sequence studies showed that these isolates clearly affiliated with the Gammaproteobacteria. BL1T and BL11 were most closely related to
Cloning and characterization of an acidic cytolysin cDNA from sea anemone Sagartia rosea.
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A full-length cDNA of cytolysin (Src I) was isolated from the tentacle of Sagartia rosea (a representative species in China) by reverse transcription polymerase chain reaction. The cDNA with an open reading frame of 648 bp encodes a precursor protein of 216 amino acids, which contains a
Apratoxin H and apratoxin A sulfoxide from the Red Sea cyanobacterium Moorea producens.
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Cultivation of the marine cyanobacterium Moorea producens, collected from the Nabq Mangroves in the Gulf of Aqaba (Red Sea), led to the isolation of new apratoxin analogues apratoxin H (1) and apratoxin A sulfoxide (2), together with the known apratoxins A-C, lyngbyabellin B, and hectochlorin. The
Prolyl hydroxylase activity in tissue homogenates of annelids from deep sea hydrothermal vents.
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Tissue homogenates of the deep sea annelids Alvinella caudata and Alvinella pompejana were found to contain enzyme activity resembling vertebrate prolyl 4-hydroxylase. The release of 3H2O from [3,4-(3)H]proline labeled, under-hydroxylated chicken protocollagen type I depended on the presence of the
Chemoreceptor-mediated polymerization and depolymerization of actin in hair bundles of sea anemones.
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Hair bundles located on tentacles of sea anemones are morphodynamic mechanoreceptors employed to regulate discharge of nematocysts into swimming prey. Activation of chemoreceptors for N-acetylated sugars is known to induce anemone hair bundles to elongate while shifting discharge to lower
The major yolk protein of sea urchins is endocytosed by a dynamin-dependent mechanism.
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Sea urchin oocytes grow to 10 times their original size during oogenesis by both synthesizing and importing a specific repertoire of proteins to drive fertilization and early embryogenesis. During the vitellogenic growth period, the major yolk protein (MYP), a transferrin-like protein, is
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