摘要：【中文】本发明属于L‑丙氨酸生产技术领域，具体公开了一种L‑丙氨酸的发酵生产方法。本发明提供的L‑丙氨酸的发酵生产方法，采用一次性投料发酵工艺，将发酵所需的糖源、氮源、无机盐等一次性投入发酵罐，灭菌降温后，再移入种子，发酵培养生产L‑丙氨酸。通过对发酵条件的优化，例如提高投糖量、控制培养风量，在保证培养所需的氧气量同时，控制发酵过程中培养温度、pH值等，突破性的提高了L‑丙氨酸发酵产酸率，缩短了发酵周期。 【EN】The invention belongs to the technical field of L-alanine production, and particularly discloses a fermentation production method of L-alanine. The fermentation production method of L-alanine provided by the invention adopts a one-time feeding fermentation process, and sugar source, nitrogen source, inorganic salt and the like required by fermentation are put into a fermentation tank at one time, and after sterilization and cooling, seeds are transferred into the fermentation tank for fermentation culture to produce the L-alanine. By optimizing fermentation conditions, such as increasing sugar feeding amount, controlling culture air volume, ensuring the oxygen amount required by culture, controlling culture temperature, pH value and the like in the fermentation process, the fermentation acid production rate of L-alanine fermentation is improved in a breakthrough manner, and the fermentation period is shortened.

摘要：【中文】一种防感应电超声波探头装置，该装置包括防感应电超声波探头，该探头包括绝缘外护（1）、屏蔽层（2）和压电晶体（3）；压电晶体（3）置于绝缘外护（1）内，屏蔽层（2）置于绝缘外护（1）与压电晶体（3）之间。其通过优化压电晶体的共振频率，提高超声波探头的机电耦合系数（机械能与电能转化的效率），提高检测的灵敏度，金属屏蔽层可有效屏蔽外部的电磁干扰，绝缘外护套可以有效防止感应电荷对探头和仪器的反冲作用，同时可以有效防止感应电所产生的干扰信号，极大的提高了检测的灵敏度与准确性，保证设备及超声波探头的正常工作。 【EN】An induction electricity prevention ultrasonic probe device comprises an induction electricity prevention ultrasonic probe, wherein the probe comprises an insulating outer sheath (1), a shielding layer (2) and a piezoelectric crystal (3); the piezoelectric crystal (3) is arranged in the insulating outer guard (1), and the shielding layer (2) is arranged between the insulating outer guard (1) and the piezoelectric crystal (3). The resonance frequency of the piezoelectric crystal is optimized, the electromechanical coupling coefficient (the efficiency of conversion of mechanical energy and electric energy) of the ultrasonic probe is improved, the detection sensitivity is improved, the metal shielding layer can effectively shield external electromagnetic interference, the insulating outer sheath can effectively prevent the recoil action of induced charges on the probe and an instrument, meanwhile, interference signals generated by the induced charges can be effectively prevented, the detection sensitivity and accuracy are greatly improved, and the normal work of the equipment and the ultrasonic probe is ensured.