This 2D lattice structure also develops substantially more slowly in the soma and dendrites than the development of the 1D MPS in axons. In addition, we observed that spectrin, actin, and adducin also form a 2D polygonal lattice structure, resembling the expanded erythrocyte membrane skeleton structure, in the somatodendritic compartment. We observed that the 1D MPS exists in a substantial fraction of dendritic regions in relatively mature neurons, but this structure develops slower and forms with a lower propensity in dendrites than in axons. Here, we investigated the spatial organizations of spectrin, actin, and adducin, an actin-capping protein, in the dendrites and soma of cultured hippocampal neurons at different developmental stages, and compared results with those obtained in axons, using superresolution imaging. It is also unclear whether other structural forms of the membrane skeleton are present in neurons. Such 1D MPS was also observed in dendrites, but the extent to which it exists and how it develops in dendrites remain unclear. This 1D MPS structure was initially observed in axons and exists extensively in axons, spanning nearly the entire axonal shaft of mature neurons. In the MPS, short actin filaments, capped by actin-capping proteins, form ring-like structures that wrap around the circumference of neurites, and these rings are periodically spaced along the neurite by spectrin tetramers, forming a quasi-1D lattice structure. Subscribe to the podcast on Apple Music here.Actin, spectrin, and associated molecules form a membrane-associated periodic skeleton (MPS) in neurons. Thanks for stopping by!Īll podcasts are archived here. If there are topics you’d like us to cover or guests you’d like us to invite, please let us know. Tessellations are patterns that repeat over and over without overlapping or leaving any gaps. Escher are just a few examples of real-life tessellations. Its the repetition that indeed makes the pattern. Turtle shells, honeycombs, raspberries, quilts, fish scales and the art of M.C. Eileen: NY Times Article: To Build Emotional Strength, Expand Your Brain A tessellation or tiling is essentially a repeated pattern that doesnt overlap or have any gaps.I think I used this online tool to get the tessellation shape.Īnd here are some of the ATCs where I experimented with lots of different techniques – just so you have an idea of what I was talking about.įun to see some of the carved stamps – the flowers on the top left and right, and one of the first continuous patterns I created on the bottom right.” This is what I meant by having to create 2 stamps as one of the shapes is the inverse of the other.
This is the next tessellation, created while going through your book ( Carve Stamp Play): Tessellation a pattern made with polygons that completely fills a space with no gaps, spaces or overlaps.
Fig 1: First attempt at regular division of a plane, with imaginary animals (1926 or 1927) He had a predisposition to the discovery and application of the priciples of tessellation, as it can be seen from early works (while he was studying under de Merquita. Escher a Dutch artist (1898-1972) who is best known for his mathematically inspired drawings and prints which displayed great realism, while at the same time showing impossible perspective, eye trickery and metamorphosis. I learned stamp carving around 2006/2007 in one of the Yahoo groups I was mentioning we were working together through Gloria Page’s book “ Art Stamping Workshop”. Escher's Tessellations of the plane, Section 8. “My first tessellation (the one that took days): MC Escher, and in particular, this print:Īlso, Marta sent me this information after the podcast:.what makes someone an incredible teacher.Marta says: “I hope you enjoy my art as much as I enjoy creating it.” She creates hand-carved blocks that she then uses as a starting point for her art.Įach hand-carved block creates a unique pattern, ranging from simple iron-work inspired patterns to complex tessellations varying from flowers and leaves to whimsical animals. Originally from Portugal but now living in the Boston area, Marta loves to draw and design patterns. On the podcast we discuss the tessellation lesson she has put together for the upcoming #CarveDecemberClass as well as her journey as an artist (hint: she had to raise her family before she could really get started). Marta has participated in #CarveDecember for many years and her tessellations have gotten more and more impressive every single year.
Mom and I had the great pleasure of chatting with Marta Harvey.
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