Worsening forearm instability led to multiple operations culminating in the creation of a radio-ulnar synostosis, sacrificing all forearm rotation to achieve a stable lever arm between the elbow and wrist joint.
Because of the previous radial head resection, this led to a floating forearm that could only be solved by creating a one-bone forearm, sacrificing all forearm rotation to achieve a stable lever arm between the elbow and wrist joint.
Briefly, after rats acquired stable lever responding, they were implanted with silastic catheters in the right jugular vein.
This arch has an important role in foot dynamics during walking, providing an optimal position of the foot joints and guaranteeing a more stable lever during the push-off phase [ 49].
The proposed method of free tendon reconstruction of scapholunate ligament complex involves formation of a stable axial lever for the scaphoid and the lunate, which restores the anatomical pattern of scapholunate ligament complex as well as prevents occurrence of rotatory subluxation of the scaphoid.
Once lever-responding reached stable levels, rats were treated acutely with two different dose ranges of SSA (0, 0.25, 0.5, and 1 mg/kg; 0, 1, 2.5, and 5 mg/kg; i.p).
First experimental results show that such bi-stable toggle-lever switches can be utilized for direct multimode fibre switching where a stroke of about 100 μm is needed.
In the present study, despite 3 weeks of extended access to cocaine self-administration and a large escalation of cocaine consumption [from 7.34±2.50 to 26.04±1.21 mg/day; F 16,160) = 15.98, P<0.01], rats rapidly acquired a strong and stable preference for lever S over lever C (Fig. 5b).
Despite an initial, stable preference for lever C, rats rapidly reversed their preference in favor of lever S when both levers were rewarded (Fig. 5a).
More surprisingly, under the S+/C+ condition, rats immediately developed a strong and stable preference for lever S which became statistically significant on day 2.
To determine whether drug history influences the choice between saccharin and cocaine, a subgroup of rats (N = 24) which had acquired a stable preference for lever C under the S-/C+ condition were subsequently tested under the S+/C+ during 10 days.
