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1. Cephalosporin C Also known as CPC (cephalosporin C, M = 415.44), it is an antibiotic produced by a fungus of the genus Cephalospores close to penicillin. Cephalosporin C is a raw material for the production of 7-aminocephalosporanoic acid (7-ACA, 7-aminocephalospranic acid, M=272.28), and 7-ACA is an important raw material for many synthetic cephalosporin antibiotics.

1. Vitamin B12 Known as cobalamin. It is a water-soluble vitamin that participates in various metabolisms in the form of coenzymes and promotes DNA and protein synthesis. 2. Synthesis of vitamin B12 The chemical synthesis of vitamin B12 is costly and the by-products are also more. At present, the mainstream is the fermentation method.

Adipic acid is an important chemical raw material, mainly producing nylon 66.

1. Electronic grade hydrogen peroxide. Hydrogen peroxide can be used in the semiconductor industry.

1. Adjustable catalytic activity, 2. The wide application. 3. achieve continuous production. 4. Saving construction investment

1. Problems caused by hard water. The demand for softening water technology begins with boiler water.

1. Arsenic in groundwater Arsenic is a common source of pollution in drinking water in nature, from arsenic-containing rocks, soils, etc., and then slowly diffuses into the water. Arsenic is often present in both organic and inorganic arsenic forms, whereas inorganic arsenic is more prevalent in water and more toxic. The countries with serious arsenic pollution in groundwater are India, Bangladesh, Vietnam, Argentina, Chile, Mexico, China, and Hungary. In China's Taiwan, Xinjiang and Inner Mongolia, local groundwater contains up to 2000ug/L of arsenic. At present, the World Health Organization stipulates that arsenic in drinking water should not exceed 10 ppb.

Citrus fruits account for about 15% of the world's total fruit production.