Liquid-Tissue Mechanics of Chick Limb-Budding: An Attempt to Determine Equilibrium Times of Physically Compressed Chick Limb-bud Tissues
Dykehouse, Rodney C.
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Early stages of Chick limb budding appear to be a result of morphogenetic tissue movements. The limb bud mesoderm and the surrounding flank mesoderm exhibit liquid-tissue properties which allow for cell slippage movements, thereby avoiding severe cell distortions. Yet intercellular adhesion differences must exist to prevent the intermixing of these two tissues and possibly to create forces strong enough to result in tissue movements, i.e. motion in the presence of friction requires the action of unbalanced forces. Intercellular adhesiveness results in rounding-up of embryonic chick tissues to create spherical cell aggregates. Surface tensions of droplets result in the ability of the droplet to round-up against a compressing force, i.e. the greater the surface tension of a droplet, the rounder it will be under a given compressing force. Surface tension measurements of chick limb bud and flank mesoderm cell aggregates have been attempted by using calibrated quartz fibers to compress these cell aggregates. Attempts to determine the equilibrium times of these compressed cell aggregates, i.e. the time necessary for the liquid-tissue aggregates to attain thermodynamic equilibrium, are reported here.
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