Nitrogen is one of the main compositions made of organism protein and nuclei acid, at the same time, it is also one of the necessary nutritious elements during the course of vegetation growth.
氮是组成生物体蛋白和核酸的主要部分，也是植物营养的三大元素之一。
The abundance of organism, nitrogen and phosphorus in the sediment directly reflect the bottom environment which, influences to a certain extent the organisms, their variety and composition.
海湾沉积物中的有机质和氮、磷营养物质丰富与否，直接反映了底质环境的优劣。底质环境的好坏在一定程度上又直接影响生物的生存、发育及种类组成。
Kieldahl's method is a classical technique to measure the nitrogen content in organism. It is introduced for an instrument's principle, software and hardware designs.
凯氏定氮法是一种经典的测量物质中氮含量的方法，介绍了一种采用凯氏定氮法的全自动定氮仪，阐述了它的工作原理以及软硬件设计。
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