TABLE 4:

The effect of varying powers in the trap on kinetochore movement in Mesostoma spermatocytes.

	A. Kinetochore moving to the pole
Power at the focus (26% of power at back focal plane) (mW)	Stops movement and recovers	Stops movement and no recovery	Decreases amplitude	No effect	Total
<15	6 (32%)	1 (5%)	6 (32%)	6 (32%)	19
15–23	3 (20%)	8 (53%)	4 (27%)	0	15
25–35	0	9 (64%)	3 (21%)	2 (14%)	14
>68	0	2 (100%)	0	0	2
Total	9 (18%)	20 (40%)	13 (26%)	8 (16%)	50
	B. Kinetochore moving away from pole
Power at the focus (26% of power at back focal plane) (mW)	Stops movement and recovers	Stops movement and no recovery	Decreases amplitude	No effect	Total
<15	2 (16%)	1 (8%)	4 (33%)	5 (42%)	12
15–23	4 (44%)	4 (44%)	1 (11%)	0	9
25–35	0	6 (86%)	0	1 (14%)	7
>68	0	0	0	0	0
Total	6 (21%)	11 (39%)	5 (19%)	6 (21%)	28