Sea Urchins
Mostrando 1-12 de 61 artigos, teses e dissertações.
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1. Preliminary molecular characterization of a proinflammatory and nociceptive molecule from the Echinometra lucunter spines extracts
Abstract Background Sea urchins are animals commonly found on the Brazilian shoreline, being Echinometra lucunter the most abundant species. Accidents caused by E. lucunter have been reported as one of the most frequent in Brazil, and are characterized by intense pain and inflammation, consequence of spine puncture in the skin. In order to characterize suc
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 21/11/2017
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2. Initial peptidomic profiling of Brazilian sea urchins: Arbacia lixula, Lytechinus variegatus and Echinometra lucunter
Abstract Background Sea urchins can be found throughout the Brazilian coast and are reported to be one of the major causes of marine accidents on the shoreline. Although not lethal, these accidents are reported to be extremely painful. In order to understand the toxinology of the Brazilian urchins, a peptidomic approach was performed aiming to characterize
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 14/06/2016
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3. Sperm and Egg Jelly Coat from Sea Urchin Lytechinus variegatus Collected in Rio de Janeiro Contain Distinct Sialic Acid-Rich Polysaccharides
This work found the occurrence of a distinct sialic acid-rich polysaccharide in the sperm surface of the sea urchin Lytechinus variegatus, which differed significantly from a similar molecule found in the egg jelly. The sperm polysaccharide extracted by protease digestion was purified using anion exchange chromatography and characterized using agarose gel el
Braz. arch. biol. technol.. Publicado em: 2015-08
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4. Osmolality and ions of the perivisceral coelomic fluid of the intertidal sea urchin Echinometra lucunter (Echinodermata: Echinoidea) upon salinity and ionic challenges
The intertidal sea-urchin Echinometra lucunter (Linnaeus, 1758) has been submitted to diluted sea water (SW) of salinity 25, or concentrated sea water of salinity 45. In addition, ionic challenges have been offered, supplementing 25 SW with Mg2+, Ca2+ or K+, until the concentration of each of these ions would reach the level of full-strength 35 SW (control).
Zoologia (Curitiba). Publicado em: 2011-08
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5. Using Macrocystis pyrifera (L.) C. Agardh from southern Chile as a source of applied biological compounds
The exploitation of seaweeds in Chile has been carried out for more than 60 years. More recently, seaweeds have been used for the production of alginate, agar and carrageenan, agricultural fertilizers and industrial aquaculture (feed for abalone and sea urchins), increasing the added value of this natural resource. In the Magellan Region (56ºS), the giant k
Revista Brasileira de Farmacognosia. Publicado em: 06/05/2011
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6. A carbohydrate-based mechanism of species recognition in sea urchin fertilization
In the present review, we describe a systematic study of the sulfated polysaccharides from marine invertebrates, which led to the discovery of a carbohydrate-based mechanism of sperm-egg recognition during sea urchin fertilization. We have described unique polymers present in these organisms, especially sulfated fucose-rich compounds found in the egg jelly c
Brazilian Journal of Medical and Biological Research. Publicado em: 2007-01
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7. Dieta do ouriço-branco, Tripneustes ventricosus (Lamarck, 1816), no Arquipélago de Fernando de Noronha, PE
Os ouriços-do-mar são macroinvertebrados bentônicos que habitam águas rasas costeiras em zonas tropicais e temperadas. Os ouriços são geralmente classificados como generalistas ou onívoros por adaptarem sua dieta de acordo com a disponibilidade dos recursos alimentares disponíveis no ambiente. Devido à forte pressão de pastagem que exercem, os ouri
Publicado em: 2007
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8. Heterofucans from Dictyota menstrualis have anticoagulant activity
Fucan is a term used to denote a family of sulfated L-fucose-rich polysaccharides which are present in the extracellular matrix of brown seaweed and in the egg jelly coat of sea urchins. Plant fucans have several biological activities, including anticoagulant and antithrombotic, related to the structural and chemical composition of polysaccharides. We have e
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-02
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9. A histone H1 protein in sea urchins is encoded by a poly(A)+ mRNA.
Typical histone genes lack intervening sequences and encode small mRNAs (400-800 nucleotides) with short leader and trailer regions. Most histone mRNAs are not polyadenylylated but rather terminate in a highly conserved stem and loop structure. The early, late, and testis-specific histone genes of sea urchins, described to date, have this typical histone gen
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10. The evolution of repetitive DNA sequences in sea urchins.
Molecular hybridization of nuclear DNAs has been employed to study the evolution of the repetitive DNA sequences in four species of sea urchin. The data show that relative to S. purpuratus there has been approximately 0.1% sequence divergence per million years in the repetitive DNA sequences of S. droebachiensis, S. franciscanus, and L. pictus. These results
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11. Nuclear lamins and peripheral nuclear antigens during fertilization and embryogenesis in mice and sea urchins.
Nuclear structural changes during fertilization and embryogenesis in mice and in sea urchins have been followed by using antibodies against the nuclear lamins A/C and B and against antigens at the periphery of nuclei and chromosomes. Lamins are found on all pronuclei and nuclei during mouse fertilization, but with a diminished intensity on the second polar b
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12. ANTISERA THAT BLOCK CELL DIVISION IN DEVELOPING EGGS OF SEA URCHINS*