The role of coacervation and phase transitions in the sandcastle worm adhesive system.
The role of coacervation and phase transitions in the sandcastle worm adhesive system.
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DOI：
10.1016/j.cis.2016.06.008
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发表时间：
2017-01
影响因子：
15.6
通讯作者：
Jones JP
中科院分区：
文献类型：
--
作者：
Stewart RJ;Wang CS;Song IT;Jones JP
沙堡蠕虫，加州芦荟，生活在北美的西海岸。单个蠕虫在海水中通过使用一种多组分的快速固化的自引发粘合剂将沙粒和生物矿物颗粒粘合在一起，在海水中形成管状外壳。该胶由不同的凝聚、相反电荷的聚电解成分-聚磷酸盐、聚硫酸盐和多胺-组成，分别造粒并在不同类型的细胞中以高浓度储存。预先组织的粘合剂模块被单独完整地分泌，但以最少的混合快速融合，并膨胀成穿透裂缝的复杂流体。在S分泌物进入海水的30分钟内，液体胶粘剂转变(套)为多孔固体胶粘剂接头。发泡固体粘合剂的纳米和微孔结构通过几种机制提高了粘接接头的强度和韧性。一种固化剂(邻苯二酚氧化酶)共包装成两种类型的粘合剂颗粒，以共价方式使粘合剂交联，并成为最终粘合接头的结构组件。颗粒砂壳胶的总体效果是细胞分选和包装机制、分泌物从液体到固体的转变以及其最终的两相多孔结构的产物，以及其组成或任何特定的氨基酸修饰。
Sandcastle worms, Phragmatopoma Californica (Fewkes), live along the western coast of North America. Individual worms build tubular shells under seawater by gluing together sandgrains and biomineral particles with a multipart, rapid-set, self-initiating adhesive. The glue comprises distinct sets of condensed, oppositely charged polyelectrolytic components—polyphosphates, polysulfates, and polyamines—that are separately granulated and stored at high concentration in distinct cell types. The pre-organized adhesive modules are secreted separately and intact, but rapidly fuse with minimal mixing and expand into a crack-penetrating complex fluid. Within 30 s of secretion into seawater, the fluid adhesive transitions (sets) into a porous solid adhesive joint. The nano- and microporous structure of the foamy solid adhesive contributes to the strength and toughness of the adhesive joint through several mechanisms. A curing agent (catechol oxidase), co-packaged into both types of adhesive granules, covalently crosslinks the adhesive and becomes a structural component of the final adhesive joint. The overall effectiveness of the granulated sandcastle glue is as much a product of the cellular sorting and packaging mechanisms, the transition from fluid to solid following secretion, and its final biphasic porous structure as it is of its composition or any particular amino acid modification.
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影响因子：
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