The brittle star Amphiura filiformis, which regenerates its arms post autotomy, is emerging as a useful model for studying the molecular underpinnings of regeneration, aided by the recent availability of some molecular resources. During regeneration a blastema initially is formed distally to the amputation site, and then a rapid rebuild is obtained by adding metameric units, which will eventual...

Metameric reproduction systems (e.g. ICC-based systems) are successfully used around the world today. For distinct applications, however, such as artwork reproduction, proofing or high accurate industrial color communication, systematic limitations avoid satisfying results. This paper discovers the systematic problems of metameric reproduction systems and introduces a spectral-based workflow th...

Chromaticity differential thresholds for five colour stimuli and three observers have been measured from metameric matchings. For each of the stimuli four differential thresholds were obtained, each of them corresponding to a different value of the degree of metamerism of the matching. Results obtained show failures in chromaticity predictions of the stimuli evaluated in the metameric match...

Efforts to apply an end-to-end color reproduction system using multi-channel visible-spectrum imaging to a van Gogh self-portrait at the National Gallery of Art, Washington D.C., have been under way at the Munsell Color Science Laboratory. The goal was to perform preliminary experiments by imaging a target consisting of pigments based on direct spectral measurements of the painting. These exper...

The peripheral nervous system (PNS) of higher vertebrates is segmented to align the spinal nerve roots with the vertebrae. This co-patterning is set up during embryogenesis, when vertebrae develop from the sclerotome layer of the metameric somites, and PNS neurons and glia differentiate from neural crest cells (NCCs) that preferentially migrate into the anterior sclerotome halves. Previous anal...

Several of the spectral match metrics considered by Imai, et al., are compared for a large number of non-metameric pairs of spectra in order to assess how accurately they track human perception as predicted by CIELAB (i.e., the extent to which the metric will exhibit a proportional relationship with CIELAB total color difference), and how precisely they do so (i.e., the relative compactness of ...

Bioinspired Robots In article number 2206336, Qinyan Zhou, Jian Xu, and Hongbin Fang pioneer a neurobiologically inspired control architecture for earthworm-like robotic in-pipe locomotion. The distributed oscillators serve as mapping between earthworm neural oscillations segment deformations, the collective dynamics of oscillator network is exploited to achieve complex gait patterns better loc...