### EMBO Workshop on Size and Shape

September14

Chaitanya Athale just returned from an exciting meeting at NCBS Bangalore (ಬೆಂಗಳೂರು) on physical principles of development and morphogenesis. Meeting old friends and making new ones. The most striking images were from Olivier Hamant, ENS Lyon France & Sainsbury Labs UK on the morphogenesis of plants. Neha Khetan and Chaitanya’s poster was put up. Old discussions about bacterial form were re-ignited.

### The Physical Basis of Biological Pattern Fomation

May7

Here I hope to keep some of the expanding links, some work and some more information on biological pattern formation that is self-organized and based on physical principles- chemical or mechanical.

Simulation from Random Walk with Drif model (Khetan and Athale, 2016, Plos Comp. Biol.)

## Watching List

1. Bonner. The Social Amoebae. The Biology of Cellular Slime Moulds.
2. C. V. Boys. Soap Bubbles and the Forces Which Mould Them. [Book from arvindguptatoys]
3. P. Ball. (2001) The Self-Made Tapestry. Pattern Formation in Nature. [Amazon]: Available in the IISER P Library
4. The Math and the Art of M. C. Escher: Part 1: Tesselation by Polygons
5. Regular tesselations on Wolfram.mathematica
6. Dudte et al. (2016) Programming curvature using origami tessellations. Nature Materials 15, 583–588. doi:10.1038/nmat4540. Work from L. Mahadevan’s lab
7. Phyllotaxy, Fibonacci numbers, the golden ratio (Goldener Schnitt) and their mathematics from Ron Knott, Univ. of Surey, UK

The spirals in the sunflower

## Doing List

1. Logarithmic spirals: r = a*e^(b*theta), where r: radius of the spiral, a, b: scaling constants, theta: angle range 0 to 2*pi.
2. Mathematica, MATLAB code (source)

Updated: 2017/7/3, CAA