### Abstract

Living beings, which are in a quasi-stable condition (meta-stable) between unstable and neutrally stable, use only five types of nitrogenous bases and 20 amino acids selected naturally. A first-order approximation of the momentum equation derived based on the cyto-fluid dynamic theory reveals the reason why the molecular weight of purines and pyrimidines among the nitrogenous bases varies by only about 1. 5 times, although the variation principle for the energy conservation law cannot do so. Here, we take a higher order of the Taylor series for the unified momentum equation describing the deformation motions of biological molecules. Even-numbered terms such as the second and fourth show no other quasi-stable size ratios. However, odd-numbered terms result in other quasi-stable ratios. The three-fold variation of the molecular weights of amino acids will come from the third term of the Taylor series.

Original language | English |
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Pages (from-to) | 407-410 |

Number of pages | 4 |

Journal | Artificial Life and Robotics |

Volume | 16 |

Issue number | 3 |

DOIs | |

Publication status | Published - 2011 Dec 1 |

### Keywords

- Amino acids
- Asymmetry
- Cyto-fluid dynamics
- Nitrogenous base

### ASJC Scopus subject areas

- Biochemistry, Genetics and Molecular Biology(all)
- Artificial Intelligence

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## Cite this

*Artificial Life and Robotics*,

*16*(3), 407-410. https://doi.org/10.1007/s10015-011-0964-2