Evaluation of the quality of two commercial sponges by tensile strength measurement
Evaluation of the quality of two commercial sponges by tensile strength measurement
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DOI：
10.1017/s0025315407056986
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发表时间：
2007-12-01
影响因子：
1.2
通讯作者：
Vacelet, J.
中科院分区：
文献类型：
--
作者：
Castritsi-Catharios, J.;Magli, M.;Vacelet, J.
本研究的目的是调查使用的拉伸强度和弹性作为两个，除其他外，客观标准的质量和商业价值的两个“象耳”商业海绵（地中海和菲律宾）的评价的可能性。这些标准还可以为区分定义不清的物种提供额外的分类学特征。发现地中海象耳的平均抗拉强度等于2.88 +/- 0.19 kg cm-2，菲律宾象耳的平均抗拉强度等于6.88 +/- 0.77 kg cm-2，而相应的弹性值分别为26.1 +/- 0.79%和7.8 +/-0.6%。这种差异与扫描电子显微镜下观察到的海绵纤维的结构和排列有关。二级纤维的排列（非常紧凑和规则的结构）以及初级纤维的丰富和定向（以垂直于外表面的条的形式排列）赋予菲律宾象耳更高的拉伸强度值、触摸的粗糙度以及因此的无弹性和刚度。相比之下，地中海象耳中大量光滑的二级纤维，它们的松散排列和有限数量的初级纤维赋予这种海绵更高的弹性和更小的拉伸强度值。
The aim of this study is to investigate the possibility of using the tensile strength and the elasticity as two, among others, objective criteria for the evaluation of the quality and commercial value of two 'Elephant Ear' commercial sponges (Mediterranean and Philippine). These criteria could also provide additional taxonomic characters for the distinction of ill-defined species. The average tensile strength of the Mediterranean Elephant Ear was found equal to 2.88 +/- 0.19 kg cm(-2) and that of the Philippine Elephant Ear equal to 6.88 +/- 0.77 kg cm-2 while the corresponding values for elasticity were 26.1 +/- 0.79% and 7.8 +/- 0.6%. This difference is related to the structure and arrangement of the spongin fibres as seen under the scanning electron microscope. The arrangement of the secondary fibres (very compact and regular structure) as well as the abundance and the orientation of the primary fibres (arrangement in the form of bars perpendicular to the external surface) give to the Philippine Elephant Ear a higher tensile strength value, a roughness to the touch and consequently inelasticity and stiffness. In contrast, the large number of smooth secondary fibres in the Mediterranean Elephant Ear, their loose arrangement and the limited number of primary fibres give to this sponge a higher elasticity and a smaller tensile strength value.