Tabony J, Job D
Département de Biologie Moléculaire et Structurale, Groupement Commissariat a l'Energie Atomique-Centre, Grenoble, France.
Proc Natl Acad Sci U S A. 1992 Aug 1;89(15):6948-52. doi: 10.1073/pnas.89.15.6948.
Reduction-diffusion theories can account for both morphogenesis and the sensitivity of biological systems to weak fields. They predict that gravity can cause the symmetry breaking that is necessary for pattern formation. Microtubules play an important role in organizing the cell, and recent studies hae shown that they can form in vitro dissipative structures. We have found that these structures show patterns of microtubular orientation that are gravity dependent and that the gravitational field causes symmetry breaking. This behavior, which cannot be explained by convection, is in accordance with the theory of dissipative structures. These results suggest that microtubular dissipative structures may play an important role both in morphogenesis and in accounting for the sensitivity of biological systems to weak fields. They aso provide another explanation for biological gravitropism.
还原扩散理论可以解释形态发生以及生物系统对弱场的敏感性。它们预测重力可导致图案形成所需的对称性破缺。微管在细胞组织中起重要作用，最近的研究表明它们能在体外形成耗散结构。我们发现这些结构呈现出依赖重力的微管取向模式，并且重力场会导致对称性破缺。这种无法用对流解释的行为符合耗散结构理论。这些结果表明微管耗散结构可能在形态发生以及解释生物系统对弱场的敏感性方面都发挥重要作用。它们还为生物向重力性提供了另一种解释。
