Category: Uncategorized

COMPUTER MODEL. “Fig. 4. Maximum-likelihood estimates of ancestral shell patterns. Shells of living species are displayed at the tips; to the right of these are shells “grown” in the computer by using the neural-network model and the fitted parameters. https://lnkd.in/dwfZQzE View in LinkedIn

THE ISSUE OF PATTERN MEMORY. “Morphogen models described by diffusion-reaction dynamics unfold with no “memory” of the system state other than the current state. The neural model, however, is a sensory feedback system in which the current secretion depends on sensing the history of the pattern before the current state.” https://lnkd.in/dwfZQzE View in LinkedIn

NEURAL MODELS. “Also, as the neural models are more general, they can generate a wider variety of patterns than can diffusible morphogen models. One other difference is fundamental.” https://lnkd.in/dwfZQzE View in LinkedIn

FRAGMENT FROM NATURE. Due to a computer malfunction, this second part of the weekend cone shell patterning fragment from a week ago was not available, so it will be inserted here to complete the series. View in LinkedIn

Seasonal goodies at their best! View in LinkedIn

SO ENDS this first of two weekends on a spectacular Russian paper on finding intact organisms outside the ISS space station, and their five year investigation of the topic, with careful controls. This builds on many reports of experimental organism survival in outer space, including lichens and tardigrades. Humanity has been willfully blind about the possibility of extraterrestrial life, and has spent a pitiful amount of money and effort investigating this topic, possibly out of fear of causing public unrest. View in LinkedIn

SHELL PATTERNINGS. “Our analyses have allowed us to estimate the shell pigmentation patterns of ancestral species, identify lineages in which one or more parameters have evolved rapidly, and measure the degree to which different parameters correlate with the phylogeny.” https://lnkd.in/dwfZQzE View in LinkedIn

First magical snowdrops of the year. View in LinkedIn

GRADUAL PHYLOGENY. “The model parameters fitted to observed patterns show a substantial phylogenetic signal, indicating that the processes governing evolutionary change in shell patterns are, to some extent, gradual across the phylogeny.” https://lnkd.in/dwfZQzE View in LinkedIn

NEURAL PATTERNING. “We have taken a step in applying modern phylogenetic methods to understanding the development of complex phenotypic characters. The pigmentation patterns of Conus shells can be generated by a neural-network model that has a sound anatomical and physiological basis.” https://lnkd.in/dwfZQzE View in LinkedIn