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The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression
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Imaging Active Surface Processes in Barnacle Adhesive Interfaces.

Joel P Golden, Daniel K Burden, Kenan P Fears

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|December 19, 2015
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Summary
This summary is machine-generated.

This study monitored barnacles using surface plasmon resonance imaging (SPRI) and voltammetry, revealing protein adsorption and complex secretory activity during adhesive interface construction. The research identified distinct ring patterns linked to molting and cement delivery.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Marine Biology

Background:

  • Barnacle adhesion is crucial for marine biofouling.
  • Understanding the chemical processes underlying barnacle attachment is vital for developing anti-fouling strategies.
  • Previous studies have focused on the composition of barnacle adhesive secretions, but in-situ dynamic processes remain less understood.

Purpose of the Study:

  • To simultaneously monitor the dynamic surface processes and chemical changes associated with barnacle reattachment and growth using surface plasmon resonance imaging (SPRI) and voltammetry.
  • To investigate the in-situ formation of the barnacle adhesive interface and identify key molecular events during growth and molting.
  • To correlate surface adsorption, secretory activity, and electrochemical changes with barnacle development.

Main Methods:

  • Simultaneous application of surface plasmon resonance imaging (SPRI) and cyclic voltammetry on gold-coated substrates with reattached Amphibalanus (=Balanus) amphitrite barnacles in artificial seawater.
  • Ex situ attenuated total reflectance infrared (ATR-IR) spectroscopy and optical/FTIR microscopy were used to analyze surface-adsorbed proteins and structural features.
  • In situ voltammetry was performed using the SPRI gold substrate as the working electrode.

Main Results:

  • SPRI detected rapid adsorption of high refractive index material at the barnacle/gold interface upon reattachment, followed by extensive secretory activity extending beyond the barnacle.
  • ATR-IR confirmed protein adsorption accompanying barnacle reattachment.
  • SPRI revealed concentric ring patterns beneath the barnacle, correlating with molt cycles and indicating delivery of amide-rich compounds from cement ducts, alongside newly formed cuticle.
  • Voltammetry identified redox-active compounds at the barnacle/gold interface, persisting throughout the reattachment period.

Conclusions:

  • Barnacle reattachment involves significant surface adsorption and complex, dynamic secretory activity.
  • The formation of the barnacle adhesive interface is a multi-stage process involving protein delivery, cuticle formation, and electrochemical changes.
  • SPRI and voltammetry are powerful tools for elucidating the in-situ surface chemistry and dynamics of bio-adhesion.