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维生素D缺乏在全球仍较为普遍,以胎儿、新生儿、婴幼儿为明显。日光照射不足是维生素D缺乏的主要原因。维生素D的产生与日光中紫外线照射关系密切,通过日照,太阳的紫外线(波长290~315 nm)可将7-脱氢胆固醇转化为维生素D3。日光照射方式包括户外和户内日光暴露,两者是预防维生素D缺乏和佝偻病的重要措施。
Vitamin D deficiency in the world is still more common to the fetus, newborn, infants and young children as obvious. Sunlight exposure is the main reason for vitamin D deficiency. The production of vitamin D is closely related to ultraviolet radiation in daylight. 7-dehydrocholesterol can be converted into vitamin D3 by sunlight and the ultraviolet rays of the sun (with a wavelength of 290-315 nm). Daylight exposure methods include outdoor and indoor daylight exposure, both of which are important measures to prevent vitamin D deficiency and rickets.