Objective To know the quality of water sources of drinking water provided for themselves in eastern unit of Lanzhou Command. Methods The water samples were collected from 194 water sources and the total coliform, ammonia, nitrite were determined according to the standard GJB1096-91. Results Of 194 drinking water sources, as to total coliform, ammonia, nitrite, 48.0%, 55.2%, 90.2% respectively were under the standard limits. Based on the comprehensive evaluation, unpolluted water sources accounted for 30.4%(59/194), lightly polluted 66.0% (128/194)and seriously polluted 3.6% (7/194) respectively. Conclusion 69.6% of water sources of drinking water provided for themselves were polluted in different degree in eastern unit of Lanzhou Command.

The nutritional value of bread fortified with zinc, lysine, iron, and calcium was evaluated by biological method. The amount of the supplemented lysine, iron, calcium and zinc in the experimental diet was 0.3%, 0.008%, 0.3% and 0.008% respectively.32 Wistar rats were devided randomly into 4 groups; the control group was fed with ordinary bread and the other three groups were fed with bread fortified with lysine, Fe and Ca, or Zn or lysine, Ca, Fe and Zn respectively. All the rats in each group took thier respective diet and drank distilled water ad libitum.The results indicated that the body weight of the group fortified with zinc alone was increased more fast at the first two weeks, and then slow down, finally, slower than the control group obviously. The increase of body weight, FE, PER, NPU, BV, weight and length of long bones, iron status in the group fortified with lysine, iron, and Ca combind were better than the control group. The group, however, fortified with lysine, Fe, Ca and Zinc combined was the best among these four groups. It promoted the growth of the rats markedly and did not impede the utilization of iron, calcium and copper as well.

Energy expenditure of five young adults worked in the hot desert environment were measured by the methods of indirect calorimetry in the Wuwei Gansou in July 1989.The results indicated that the basal metabolism rate, the resting metabolism rate and the energy cost of young adults marching in the desert and Gobi (15kg load, at rate of 3.5km/h) were 2.782,3.059,14. 188, 10.305 kJ? m-2?min-1 respectively. It was shown that under the similar conditions energy expenditure marching in the desert was 38% more than in the Gobi.Ambient temperature had a greater effect on energy expenditure but the effect was various at different activities. When at 24.5-38.4℃ during marchi-ng(15kg load),1℃increase in ambient temperature was associated with anincrease of about 0.86% energy consumption. While at 25-33℃ during quiet rest the energy consumption tended to decrease with an increase of ambient temperature. But at 33-40℃ it increased with ambient temperature again. It is suggested that the energy metabolism may be more easily influenced by ambient temperature when the metabolic heat production of human body is increased.The present study recommended the estimation of energy requirement for the adult with a moderate activity in hot desert environment should be approximate 15.062MJ/d