吃海带的14大好处和3大禁忌

吃海带的14大好处1．防治甲状腺肿。海带含碘和碘化物,有防治缺碘性甲状腺肿的作用。2．降压。海带氨酸及钾盐、钙元素可降低人体对胆固醇的吸收,降低血压。     

吃海带的14大好处和3大禁忌

<正>吃海带的14大好处1.防治甲状腺肿。海带含碘和碘化物,有防治缺碘性甲状腺肿的作用。2.降压。海带氨酸及钾盐、钙元素可降低人体对胆固醇的吸收,降低血压。3.降脂。海带含有大量的不饱和脂肪酸和食物纤维,能清除附着在血管壁上的胆固醇,调顺肠胃,促进胆固醇的排泄。4.抑制肿瘤。海带提取物对于体外的人体KB癌细胞有明显的细胞毒作用,对S180肿瘤有明显的抑制作用,而且海带还富含抗癌明星——硒,具有防     

Does copper reduce cadmium uptake by different rice genotypes？

A hydroponics experiment was conducted to investigate the effect of copper （Cu） on cadmium （Cd）, calcium （Ca）, iron （Fe）, and zinc （Zn） uptake by several rice genotypes. The experiment was carried out as a 2×2×4 factorial with four rice genotypes and two levels of Cu and Cd in nutrient solution. Plants were grown in a growth chamber with controlled environment. The results showed a significant difference between the biomass of different rice genotypes （P 〈 0.001）. The Cd and Cu concentration in the solution had no significant effect on the biomass. The addition of Cu significantly decreased Cd uptake by shoots and roots of rice （P 〈 0.001）. The Cd concentration did not significantly influence Ca uptake by plants, whereas the Cu concentration did （P = 0.034）. There was a significant influence of Cd on Fe uptake by shoots and roots （P 〈 0.001, P = 0.003, respectively）. Zn uptake decreased significantly as the addition of Cd and Cu increased in shoots. We concluded that Cu had significant influence on Cd uptake. The possible mechanisms were discussed.     

酸度介质对原子吸收法测定钙元素灵敏度的影响

对火焰原子吸收法测定钙元素的酸度介质条件进行了分析和论述。通过在不同的盐酸和硝酸介质条件下对钙元素的实际测定,较为充分地论述了不同的盐酸和硝酸介质条件对实验测定的影响,进而选择出最适宜的测定介质条件,提出了相关建议,使方法的测定灵敏度有了显著提高。