全同粒子是指质量、电荷、自旋等一些固有性质相同的粒子，它们在散射时表现出一些特别的性质。
The identical particles are the particles with inherent identical character in mass, electric charge, spin, etc.
因此，普鲁兰多糖在水溶液中带有正电荷而其固有特性不变的性质非常重要。
Therefore, it was considered to be of considerable significance to render pullulan positively charged in an aqueous solution, its inherent characteristics being retained.
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