Apparatus consists of thermocouple connected to semiconductor reference junction. Junction is connected to amplifier that boosts signal by 1,000. High-level signal is displayed on recorder and fed into second amplifier where it is compared with signal from potentiometer of programmed dc reference in bag-temperature programer. Difference in signals indicates output voltage. Remaining circuitry provides zero-phase, time-proportion control of heaters such that heater power is directly proportional to error signal.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Controlled freezing of biological samples


    Contributors:

    Published in:

    Publication date :

    1978-06-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Controlled Temperature Gradient Improves Freezing Alloy

    Schmidt, Deborah / Alter, Wendy S. / Hamilton, William D. | NTRS | 1991


    FREEZING-INDUCED FLUID-MATRIX INTERACTION IN BIOLOGICAL TISSUE

    Han, B. | British Library Conference Proceedings | 2007


    Storage of biological samples.

    Fraser, T. M. | NTRS | 1968


    Storage of biological samples

    Fraser, T. M. | TIBKAT | 1967


    Ultrafast UV pulses excite biological samples

    British Library Online Contents | 1997