Ifremer , UMR 241 EIO, UPF-ILM-IRD, Labex Corail , BP 7004, 98719 Taravao, French Polynesia ; Ifremer , UMR 5244 IHPE, UPVD, CNRS, Université de Montpellier , CC 80, 34095 Montpellier, France.
Ifremer , UMR 241 EIO, UPF-ILM-IRD, Labex Corail , BP 7004, 98719 Taravao, French Polynesia.
R Soc Open Sci. 2015 Jul 15;2(7):150144. doi: 10.1098/rsos.150144. eCollection 2015 Jul.
Cultured pearls are human creations formed by inserting a nucleus and a small piece of mantle tissue into a living shelled mollusc, usually a pearl oyster. Although many pearl observations intuitively suggest a possible rotation of the nucleated pearl inside the oyster, no experimental demonstration of such a movement has ever been done. This can be explained by the difficulty of observation of such a phenomenon in the tissues of a living animal. To investigate this question of pearl rotation, a magnetometer system was specifically engineered to register magnetic field variations with magnetic sensors from movements of a magnetic nucleus inserted in the pearl oyster. We demonstrated that a continuous movement of the nucleus inside the oyster starts after a minimum of 40 days post-grafting and continues until the pearl harvest. We measured a mean angular speed of 1.27° min(-1) calculated for four different oysters. Rotation variability was observed among oysters and may be correlated to pearl shape and defects. Nature's ability to generate so amazingly complex structures like a pearl has delivered one of its secrets.
养殖珍珠是人类的创造，通过将核和一小片外套膜组织插入活的有壳软体动物中形成，通常是珍珠贝。尽管许多珍珠观察结果直观地表明，有核珍珠在牡蛎内部可能会发生旋转，但从未进行过这种运动的实验证明。这可以解释在活体动物组织中观察到这种现象的困难。为了研究珍珠旋转的问题，专门设计了一个磁力计系统，使用磁性传感器来记录插入珍珠贝中的磁性核的运动所产生的磁场变化。我们证明，在嫁接后至少 40 天，核在牡蛎内部开始进行连续的运动，并持续到珍珠收获。我们测量了四个不同牡蛎的平均角速度为 1.27°/min。在牡蛎之间观察到了旋转的可变性，并且可能与珍珠的形状和缺陷有关。大自然生成如此复杂的结构的能力，如珍珠，揭示了它的一个秘密。
