Samples of roadside dust were collected from 30 sites in Hong Kong.The total concentrationsof 10 metals in the samples were analyzed,and the correlation coeffic
The toxic effects of chromium and tin salts on growth, <sup>14</sup>C uptake, heterocyst differentiation, and nitrate reductase. nitrogenase, and glutamine synt
Blood lead levels of 180 pupils from two elementary schools were determined and the intellec-tual development of the children was followed.The children in these