Srivastava A S, De S K
Zentralbl Bakteriol Naturwiss. 1980;135(5):408-12. doi: 10.1016/s0323-6056(80)80097-8.
The influence of ultrasonic waves, alone and in presence of different (0.1, 0.5, and 1.0%) concentrations of NaCl, KH2PO4 and NH4Cl on the microbial production of citric acid by Aspergillus niger was studied. It was observed that in presence of sonic waves alone the yield of citric acid was generally better than that of control. Besides, some morphological changes in the diameter of the conidiophore of the of the mould was also noted. The effect of sonics in presence of NaCl was inconspicuous since at all sonic doses taken for the study, the yield of citric acid was less in comparison to the control. However, in presence of 0.5% KH2PO4 the yield was comparatively better (42.2%) over the control. The best result obtained amongst these treatments was found with the effect of sonics in presence of 0.5% NH4Cl in which the optimum yield of citric acid produced was greater than that of the control by 52.4%.
研究了超声波单独作用以及在不同浓度（0.1%、0.5%和1.0%）的氯化钠、磷酸二氢钾和氯化铵存在下，对黑曲霉微生物产柠檬酸的影响。观察到单独存在声波时，柠檬酸产量总体上优于对照。此外，还注意到霉菌分生孢子梗直径的一些形态变化。氯化钠存在下声波的影响不明显，因为在该研究采用的所有声波剂量下，柠檬酸产量与对照相比更低。然而，在0.5%磷酸二氢钾存在下，产量相对对照更好（42.2%）。在这些处理中获得的最佳结果是在0.5%氯化铵存在下声波的作用，其中产生的柠檬酸最佳产量比对照高52.4%。
