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日本冈山大学的小林纯名誉教授在日本陆水学会会议上发表一项研究内容、指出:“在饮用含较高的钙及碳酸钙硬水的冲绳等西南诸岛地区,很少出现脑溢血死亡者”。小林教授曾用数十年时间对日本五百条河川的水质进行了分析,发现秋田、岩手、山形等东北地方的河水碱度低,酸性高,这一地区脑溢血的死亡率也较高。相反,在脑溢血死亡率较低的西日本地区河水中酸度较低。于是他总结出“越是钙、碳酸钙含量低的水域,脑溢血发病率越高。”另外,小林教授还对东南亚的河川水质进行过分析,指出导致水俣病(因公害引起的,中年妇女腰、
Kobayashi Pure Honorary Professor at Okayama University in Japan published a study at the Japan Society of Lushui, stating: “Few cerebral hemorrhagic deaths occurred in areas such as Okinawa that contain high levels of calcium and calcium carbonate hard water ”. Prof. Kobayashi analyzed the water quality of 500 rivers in Japan for several decades and found that rivers in the northeastern Akita, Iwate, and Yamagata have low alkalinity and high acidity, and the death rate of cerebral hemorrhage in this area is also high. In contrast, the acidity is low in the waters of western Japan where mortality from stroke is low. So he concluded that “the more calcium, calcium carbonate low water areas, the higher the incidence of stroke.” In addition, Professor Kobayashi also conducted an analysis of river water quality in Southeast Asia, pointed out that Minamata disease (caused by pollution, middle-aged women waist,