Proposed Revision for Preparation of Meat Samples for Total Phosphorus Determination

Six ham samples were analyzed in duplicate by nine laboratories for total phosphorus. The samples were dried and ashed in a muffle furnace at 550°C according to method 2.017(c) and the proposed method. The gravimetric quinoline molybdate method, 2.025(b), was used to determine total phosphorus in both preparations. No statistically significant difference (p = 0.05) was found among the phosphorus values obtained by the above treatments.

Motor nerve terminals as the site of initial functional changes after denervation

For the cat soleus nerve-muscle system, motor nerve section 48 hr prior to in situ experiment causes certain characteristic transmission losses. Responses to repetitive stimulation are sharply altered: The capacity to transmit iterative stimulation is severely reduced; post-tetanic potentiation and the post-tetanic repetition of soleus nerve terminals responsible for it are also greatly impaired; a phenomenon of post-tetanic depression was frequently observed. However, function of the extramuscular axons appears normal and single impulse transmission is usually not seriously affected. The loss of reactivity to repetitive stimulation has been traced to soleus motor nerve terminals. In view of these data and the known absence of denervation hypersensitivity at this time, the earliest functional failure may be said to occur in the unmyelinated terminals. This subacutely denervated preparation therefore offers a simple means of evaluating motor nerve terminal responsiveness.