出版社：Japanese Society of Nutrition and Food Science
摘要：1) The authors gave tryptophan deficient diet to albino rats, weighing 120 to 130g, andf ound the following characteristic symptoms: i) All of the rats revealed the symptoms within a month. ii) The symptoms resembled Parkinson's disease, one of the symptoms of the extrapyramidal lesions. iii) The general conditions of the rats were fair. iv) When tryptophan was given after the appearance of nervous symptoms, their recovery was poor. They showed almost no signs of improvement even after a month. 2) When rats weighing 40 to 50 g were fed on tryptophan deficient diets, they weakened rapidly and died before they showed any nervous symptoms.
