N-Acetyl-S-(6-hydroxy-2,4-cycl

L-Mimosine (-(3-Hydroxy-4-Pyridone-1-yl)-L-Alanine)

matter in the seed has limited its use as a livestock feed since mimosine and its degradation products 3-hydroxy-4-(1H )-pyridone (3,4-DHP) and 2,3-dihydroxypyridine (2,3-DHP) have been known to be toxic to many species (Fig. 1) . Ingestion of mimosine

N-S比率 N-S ratio

　　 A． Meyer（ 1926）提出的表示湿润度的物理量，并赋以 N／ S=降水量（毫米）／（饱和水蒸气张力 -实际水蒸汽张力）（毫米 Hg）的定义。通常以一年的数量为对象，分母实际上是饱和水蒸汽张力对于当地平均气温之比，乘以空气关系饱和差（从 100减去平均相对湿度，又以 100除所得商）来求出。如下：表所示与植物群落及土壤类型的分布状况颇相一致。    

34S and 15N Labelling to Model S and N Flux in Plants and Determine the Different Components of N and S Use Efficiency

In order to highlight our understanding on ecosystems functioning and resource sharing/competition, either in artificial environment or agrosystems, according to changes in the climatic conditions, it is necessary to measure accurately