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The Pineal Gland

The Pineal Gland

The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...

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Updated: Jun 17, 2025

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Published on: February 4, 2013

Orchestrated Movement Sequences and Shape-Memory-like Effects in Pine Cones.

Martin Horstmann^1,2, Thomas Speck^2,3, Simon Poppinga^3,4

¹Department of Animal Ecology, Evolution and Biodiversity, Ruhr-University Bochum, 44780 Bochum, Germany.

Plants (Basel, Switzerland)

|August 10, 2024

Summary

This summary is machine-generated.

Pine cone scales move hygroscopically, opening and closing with weather changes to disperse seeds. Researchers explored this seed-scale movement, revealing the abaxial surface

Keywords:

bilayer actuation functional robustness hygroscopic movement pine cone movement shape-memory-like effects time lapse tissue mechanics water uptake manipulation

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Area of Science:

Plant biology
Biophysics
Ecology

Background:

Hygroscopic seed-scale movement in pine cones is crucial for weather-adaptive opening, closing, and seed dispersal.
Despite extensive research, the precise mechanical and structural processes governing cone and seed scale behavior remain incompletely understood.

Purpose of the Study:

To achieve a deeper mechanical and structural understanding of pine cones and their individual seed scales.
To investigate the desiccation- and wetting-induced movement processes in seed scales through analysis and experiments.

Main Methods:

Conducted a series of analyses and manipulative experiments on pine cones and individual seed scales.
Investigated desiccation- and wetting-induced movement processes.
Tested the shape and biomechanical property restoration of dry, deformed scales upon wetting.

Main Results:

Identified the abaxial scale surface as the primary driver of water evaporation from closed cones, leading to cone opening.
Demonstrated that dry and deformed scales can restore their original shape and biomechanical properties when re-wetted.

Conclusions:

The findings provide new insights into the complex orchestration of scale movement, involved forces, and functional robustness in pine cones.
Enhances understanding of the mechanisms behind hygroscopic pine cone opening and its ecological context.
Suggests potential applications in the development of smart biomimetic actuators.