| 摘要 |
PURPOSE:To obtain a signal to monitor and control momentarily the progressing condition of biochemical reaction in real time by measuring the change of the electrical conductivity of the living material in a reaction vessel. CONSTITUTION:Electrodes 9, 10 for measuring conductivity are inserted in the reaction vessel 7 and are connected to an oscillator 8. AC current from the oscillator 8 passes through the material in the vessel 7, the electrode 10 and a detecting resistor 11 and returns to the oscillator. The value proportional to the electrical conductivity of the material in the vessel 7 is obtd. from the AC voltage at both terminals of the resistor 11 when the measurement is made by maintaining the specified voltage of an AC power source. The signal taken from the resistor 11 is passed through an amplifying detector 12 and the change of the electrical conductivity with time is recorded in a recorder 13. The output of the detector 12 is compared with a set value in a comparator 14 which delivers a control signal through signal transmission lines 15, 16. The C9, C10 of the equiv. circuit for the current flowing between the electrodes 9 and 10 are he static capacity between the electrodes 9, 10 and the material in the vessel 7a. The progressing condition of the chemical reaction in the vessel 7 is monitored and discriminated by measuring momentarily the electric resistance R of the material in the vessel 7. |
