Mechanisms of gill-clogging by hagfish slime
Mechanisms of gill-clogging by hagfish slime
复制标题
盲鳗粘液堵塞鳃的机制
DOI：
10.1098/rsif.2022.0774
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发表时间：
2023
影响因子：
3.9
通讯作者：
Fudge, Douglas S.
中科院分区：
文献类型：
--
作者：
Taylor, Luke;Chaudhary, Gaurav;Jain, Gaurav;Lowe, Andrew;Hupe, Andre;Negishi, Atsuko;Zeng, Yu;Ewoldt, Randy H.;Fudge, Douglas S.
盲鳗在受到攻击时，会分泌大量的纤维黏液来保护自己免受鳃式捕食者的攻击。这种黏液的有效性来自于它堵塞捕食者鳃的能力，但盲鳗黏液堵塞捕食者鳃的机制尚不确定，特别是考虑到它的固体浓度非常低。我们量化了盲鳗黏液在一定浓度范围内的堵塞性能，测量了其黏液和线组分的贡献，并测量了湍流混合对堵塞的影响。为了评估盲鳗黏液的多孔结构，我们使用了一种定制的装置来测量其达西渗透率。我们发现盲鳗粘液在极稀的浓度下堵塞，就像在本地盲鳗粘液中发现的那样，并且显示堵塞性能优于三种增稠剂。我们报道盲鳗黏液的达西渗透率极低，有效孔径为10-300 nm。我们还表明，黏液和螺纹成分发挥着不同但至关重要的作用，黏液负责有效堵塞和低渗透性，而螺纹赋予机械强度并随时间保持堵塞功能。我们的研究结果为盲鳗粘液堵塞鳃的机制提供了新的见解，并可能激发具有新特性的超软材料的开发。
Hagfishes defend themselves from gill-breathing predators by producing large volumes of fibrous slime when attacked. The slime's effectiveness comes from its ability to clog predators' gills, but the mechanisms by which hagfish slime clogs are uncertain, especially given its remarkably dilute concentration of solids. We quantified the clogging performance of hagfish slime over a range of concentrations, measured the contributions of its mucous and thread components, and measured the effect of turbulent mixing on clogging. To assess the porous structure of hagfish slime, we used a custom device to measure its Darcy permeability. We show that hagfish slime clogs at extremely dilute concentrations like those found in native hagfish slime and displays clogging performance that is superior to three thickening agents. We report an extremely low Darcy permeability for hagfish slime, and an effective pore size of 10–300 nm. We also show that the mucous and thread components play distinct yet crucial roles, with mucus being responsible for effective clogging and low permeability and the threads imparting mechanical strength and retaining clogging function over time. Our results provide new insights into the mechanisms by which hagfish slime clogs gills and may inspire the development of ultra-soft materials with novel properties.
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