THERE is good reason for believing that gastric hydrochloric acid is neutralized by ammonia formed most probably by urease from circulating urea. This enzyme is present in the mucosa. This mechanism ...

Nitrogen (N) is the nutrient required in the greatest amounts and the most limiting factor for plant growth (Souza and Fernandes, 2018). Urea [CO(NH 2) 2] is the most used N fertilizer worldwide, with ...