Data contributing to an analysis of metaphase mechanics

摘要: 1. The length of the spindle is independent size chromosomes but correlated with dimensions cell, nucleus, and centrioles (Arvelius). 2. Under certain conditions there may be a direct attraction between centers (bouquet stage; Anisolabis diakinesis), under other appear to influence indirectly by way nuclear membrane (diakinetic spacing; equatorial ring in Brachystethus). 3. An extrachromosomal elements nucleus evinced at periods (diffuse stage Loxa; diakinesis Brachystethus, Mecistorhinus others). 4. In monopolar spindles neither an plate nor normal ellipsoidal formed, though become oriented toward single pole (Anisolabis others). 5. The establishment occurs only after formation fibers involves positive as well negative forces, i. e. give take chromosomal tendency body evict (Homarus; harlequin lobe mantids). 6. Irregularities timing or general condition kinetochores result their expulsion from plate; extreme displacement this sort pressure arising forcible elongation while polar axis not increased (Brachystethus; Mecistorhinus).