HIGH-ALTITUDE PULMONARY HYPERTENSION.
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Biomedical subjects
Publications and source records attributed to I SINGH.
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Activation of a frog stomach muscle preparation by electrical stimulation of a vagus nerve or by direct stimulation released two polypeptides. One was destroyed by trypsin or chymotrypsin in about 10 min; the activity of the other was enhanced by trypsin for about 10 min, but was destroyed by chymotrypsin. Similar stimulation of dog stomach muscle did not release these polypeptides. Correspondingly, the transmission from vagus nerve to stomach muscle in the frog was resistant to atropine, but was blocked by atropine in the dog.
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