The main factors governing photoinduced toxicity of the anthraquinone are molecular polarity, the ability of electron transition and the largest negative net atomic charges.

影响蒽醌类化合物对大型溞光敏化毒性的主要因素是分子的极性、电子的跃迁能力和原子最负净电荷。

youdao

Quarks, the particles from which atomic nuclei are made, were reckoned to have such fractional charges, but since it is impossible to isolate a quark, its charge cannot be measured directly.

ECONOMIST: The 1998 Nobel prizes