两种豚鼠听毛细胞分离法比较

目的对耳蜗灌注法和酶解加机械分离法的结果进行比较，并观察单离毛细胞的形态和存活情况。方法用耳蜗灌注法及酶解加机械分离法分离豚鼠听毛细胞，并在倒置相差显微镜下观察单离毛细胞。结果用耳蜗灌注法，７只豚鼠，７耳，平均每耳可分离出长于３０μｍ的外毛细胞１７３个（１１６～３３９），短于３０μｍ的外毛细胞１３０个（５０～４４７），内毛细胞０～１０个。室温下短期培养６ｈ后，长于３０μｎ的外毛细胞有１２３个（５８～３３６），短于３０μｍ的外毛细胞有１０３个（２０～２９６）。用酶解加机械分离法，７只豚鼠，７耳，平均每耳可分离出长于３０μｍ的外毛细胞７２个（２１～１５２），而短于３０μｍ的外毛细胞及内毛细胞则未能分离出。室温下短期培养６ｈ后，长于３０μｍ的外毛细胞有３０个（８～５６）。毛细胞损伤表现为细胞扭曲，细胞顶部表皮板脱落。细胞变性表现为细胞膜不平，细胞水肿，随时间变化逐渐加重。死亡表现为细胞核不被中性红染色。结论用耳蜗灌注法分离毛细胞简便易行，能提供足够量的存活时间较长的外毛细胞，而用酶解加机械分离法分离的毛细胞数相对较少，存活时间相对较短。

Recover vigorous cells of Magnetospirillum magneticum AMB-1 by capillary magnetic separation

Cultivable magnetotactic bacteria(MTB) in laboratory can provide sufficient samples for molecular microbiological and magnetic studies.However,a cold-stored MTB strain,such as Magnetospirillum magneticum AMB-1,often loses its ability to synthesize magnetosomes and consequently fails to sense the external magnetic field.It is therefore important to quickly recover vigorous bacteria cells that highly capable of magnetosome producing.In this study,a modified capillary magnetic separation system was designed to recover a deteriorating strain of Magnetospirillum magneticum AMB-1 that long-term cold-stored in a refrigerator.The results show that all cells obtained after a 3-cycle treatment were vigorous and had the ability to produce magnetosomes.Moreover,the 3rd-cycle recovered cells were able to form more magnetosome crystals.Compared with the colony formation method,this new method is time-saving,easily operated,and more efficient for recovering vigorous MTB cells.