Functional bases (decreasing the susceptibility to water or wave action, desiccation, light, or predation; supplying nutrients through skin digestion and absorption) have been ascribed to this "covering reaction" 1–13 .doi:10.1038/262490a0LAWRENCE...
In a "respiratory burst", fertilized sea urchin eggs consume oxygen to produce H 2O 2 as an extracellular oxidant to crosslink their protective surface env... JW Heinecke,BM Shapiro - 《Developmental Biology》 被引量: 17发表: 1990年 Specific dynamic action in the sunflower star, Pycnopodia...
Spiny starfish arm in action The asymmetric heads of flat fish always intrigue me, so I am delighted when we find the first little topknot, then more and more of them. Some are sticking to the rocks, even clinging on when completely upside down, using their fringing fins to mould themselv...
We suggest that formation of the teratoma-like structures in embryos, activation of DNA synthesis, and significant increase of cell number in embryo-derived cell cultures could be attributed to Gal4 gene action. 展开 关键词: embryogenesis, cell culture, genes, DNA, cell growth, reverse ...
Histopathological biomarkers in gonads can help to understand the mode of action of chemicals on processes related to reproduction (Au et al., 2001, Dietrich et al., 2009). In a recent study, severe histopathological alterations were observed in gonads of female Psammechinus miliaris following ...
The shingle urchin (Colobocentrotus atratus), which lives on exposed shorelines, is particularly resistant to wave action. It is one of the few sea urchin that can survivemany hoursout of water. Sea urchins can be found in all climates, from warm seas to polar oceans. ...
Evolution is proposed to result, in part, from acquisition of new developmental programs. One such example is the appearance of the micromeres in a sea urchin that form by an asymmetric cell division at the 4thembryonic cleavage and function as a major signaling center in the embryo. Micromere...
What is one hypothesis for why sea urchins tend to have some of the lowest metabolic rates in animals?Impacts of MetabolismThe rate of metabolism differs for various organisms for the synthesis of energy. When the rate of metabolism is high, the body requir...
We demonstrate the action of the dental promoter muscles in advancing the continuously growing teeth of sand dollars and sea urchins. Teeth wear at the occlusal end, while new calcite is added to the opposite end. Dental ligaments rigidly hold teeth during chewing, but soften and reform during ...
Many species of sea urchins are known to cover themselves with macroalgae, shells, rocks, or a variety of other objects and many explana- tions for this behavior have been proposed in the past (reviewed by Lawrence 1976). Dayton et al. (1970) reported on covering behavior in S. neumayeri...