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also reviewed the uses of formaldehyde (31 references, 2 years after it's introduction as a fixative) and described other fixative mixtures.] ** Alternatives to mercury-containing fixatives Question. What is the best substitute for B-5 fixative

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两周内使用。此溶液的渗透浓度为300mOs mmol/L/kg。 　　（2）贮存液B（8%多聚甲醛溶液）：称8g多聚甲醛加入100ml蒸馏水中，配成8%多聚甲醛液（方法见前）。过滤后4℃冰箱保存。 　　（3）临用前，以3份A液与1份B液混合，再加入结晶过碘酸钠（NaIO4），使NaIO4终浓度为2%。由于AB两液混合，pH从约7.5降至6.2，故固定时不需再调pH值。固定时间为6～18h。 　　该固定剂较适于富含糖类的组织，对超微结构及许多抗原的抗原性保存较好。其机制是借助