当一个有机分子如电子给予体吡啶吸附在表面上时，阳离子由于电子转移而还原。
When an organic molecule like electron donating pyridine adsorbs on the surface, cations get reduced due to charge transfer.
在进行手术前(除急诊外)，应尝试使用药物如柳氮磺吡啶、激素、硫唑嘌呤、肿瘤坏死因子拮抗剂及反应停。
Agents such as sulfasalazine, corticosteroids, azathioprine, TNFa antagonists and thalidomide should be tried first before surgery, except in emergencies.
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