【摘 要】
:
早在1879年,英国著名化学家布鲁斯就发现牛奶上层乳清中存在一种黄绿色的荧光色素。科学家试用各种方法提取,试图发现其化学本质,都没有成功。直到1933年,美国科学家哥尔倍格
论文部分内容阅读
早在1879年,英国著名化学家布鲁斯就发现牛奶上层乳清中存在一种黄绿色的荧光色素。科学家试用各种方法提取,试图发现其化学本质,都没有成功。直到1933年,美国科学家哥尔倍格等从1000多千克牛奶中得到18毫克这种物质,后来人们因为其分子式上有一个核糖醇,将其命名为核黄素。
As early as 1879, Bruce, a famous British chemist, found a yellow-green fluorescent pigment in milk whey. Scientists try various methods to extract, trying to find out its chemical nature, have not been successful. Until 1933, the American scientist Gotberger and others got 18 milligrams of this substance from more than 1,000 kilograms of milk, and later people named it riboflavin because of its molecular formula of an arabitol.
其他文献
课程思政是以“立德树人”为教育根本,通过全员、全程、全课程的共同构建,促进各类课程与思想政治教育的同向进行,进而产生协同效应的综合教育理念.大学语文是各类高校必修的
健忘不仅会发生在中老年人身上,也有不少年轻人开始健忘。有关专家指出,健忘与平时的生活习惯有关。年轻人健忘大多为功能性的,尤其是教师、记者、公司白领等知识女性,工作压
Following the example of Great Britain, Mexico has promulgated its own General Law on Climate Change on June 6, 2012.The Act contains two parts: the first i
该文就《植物化学保护》课程跨校修读学分教学模式改革的意义,《植物化学保护》课程跨校修读学分现状及应对策略进行探讨,针对《植物化学保护》课程跨校修读学分中存在的部分
常规绿枝扦插育苗,插后一般用透明塑料薄膜作栱形覆盖保护插床,为防止强光直射对插穗的为害,还需在栱膜上搭架,盖上芦帘遮荫,故育苗的成本费较高。据日本的原田顺二(1987)报
Measures adopted by the EU to combat climate change should be integrated within EU energy policy, the EU is relying principally on market based instruments.
The current global carbon markets were effectively created with the ratification of the Kyoto Protocol and the implementation of the European Union Emission
As a substantial source of greenhouse gas (GHG) emissions and energy consumption, the road construction domain has to bring a contribution to the reduction
4岁幼儿南南一天食谱列举早餐:鲜牛奶300毫升(有时换成豆浆)、面包2片、鸡蛋一个。午餐:土鸡煲、西红柿汤、米饭一碗。点心:蛋糕一块,碳酸饮料250毫升。晚餐:菜肉馄饨20只。
大学生是国家未来发展的中坚力量,其理想信念与中华民族的伟大复兴密切相关,身为高校思想政治教育工作者,理想信念教育的思维与方法,必须紧跟时代潮流.在“互联网+”的时代,