Proton conductivity in ampullae of Lorenzini jelly.
Proton conductivity in ampullae of Lorenzini jelly.
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DOI：
10.1126/sciadv.1600112
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发表时间：
2016-05
期刊：
影响因子：
13.6
通讯作者：
Rolandi M
中科院分区：
文献类型：
--
作者：
Josberger EE;Hassanzadeh P;Deng Y;Sohn J;Rego MJ;Amemiya CT;Rolandi M
研究人员发现，在鲨鱼和冰鞋的洛伦齐尼壶腹中发现的果冻的质子传导率异常高。1678年，Stefano Lorenzini首次描述了鱼雷射线中功能未知的器官网络-Lorenzini壶腹（AoL）。一个单独的壶腹由皮肤上的一个对环境开放的毛孔、一个含有胶状物的管道和一系列具有电感应细胞的肺泡组成。近300年来，AoL的作用仍然是一个谜，直到研究表明冰鞋，鲨鱼和光线检测到潜在猎物产生的非常微弱的电场。AoL果冻可能有助于这种电感测功能，但这种贡献的确切细节仍不清楚。我们测量了从冰鞋和鲨鱼中提取的AoL果冻的质子电导率。AoL凝胶的室温质子电导率非常高，为2 ± 1 mS/cm。这种电导率仅比目前最先进的质子传导聚合物Nafion低40倍，是迄今为止报道的生物材料的最高电导率。我们认为，硫酸角质素，确定以前在AoL果冻和确认在这里，可能有助于高质子电导率的AoL果冻与其硫酸基团酸基团和质子供体。我们希望所观察到的高质子传导性的AoL果冻可能有助于未来的研究的AoL功能。
Researchers find the proton conductivity of jelly found in the Ampullae of Lorenzini of sharks and skates to be unusually high. In 1678, Stefano Lorenzini first described a network of organs of unknown function in the torpedo ray—the ampullae of Lorenzini (AoL). An individual ampulla consists of a pore on the skin that is open to the environment, a canal containing a jelly and leading to an alveolus with a series of electrosensing cells. The role of the AoL remained a mystery for almost 300 years until research demonstrated that skates, sharks, and rays detect very weak electric fields produced by a potential prey. The AoL jelly likely contributes to this electrosensing function, yet the exact details of this contribution remain unclear. We measure the proton conductivity of the AoL jelly extracted from skates and sharks. The room-temperature proton conductivity of the AoL jelly is very high at 2 ± 1 mS/cm. This conductivity is only 40-fold lower than the current state-of-the-art proton-conducting polymer Nafion, and it is the highest reported for a biological material so far. We suggest that keratan sulfate, identified previously in the AoL jelly and confirmed here, may contribute to the high proton conductivity of the AoL jelly with its sulfate groups—acid groups and proton donors. We hope that the observed high proton conductivity of the AoL jelly may contribute to future studies of the AoL function.