Study the given diagram of a simple stirred tank bioreactor. The part labelled X helps in adding buffers to the culture medium. Which of the following conditions does it help to control?
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Design and Performance of Single-Use, Stirred-Tank Bioreactors - BioProcess InternationalBioProcess International
![An overview of drive systems and sealing types in stirred bioreactors used in biotechnological processes | SpringerLink An overview of drive systems and sealing types in stirred bioreactors used in biotechnological processes | SpringerLink](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs00253-021-11180-7/MediaObjects/253_2021_11180_Fig1_HTML.png)
An overview of drive systems and sealing types in stirred bioreactors used in biotechnological processes | SpringerLink
![A schematic diagram of a stirred tank bioreactor. Adopted from NCBC 22 | Download Scientific Diagram A schematic diagram of a stirred tank bioreactor. Adopted from NCBC 22 | Download Scientific Diagram](https://www.researchgate.net/publication/250223909/figure/fig4/AS:392822578741284@1470667609600/A-schematic-diagram-of-a-stirred-tank-bioreactor-Adopted-from-NCBC-22.png)
A schematic diagram of a stirred tank bioreactor. Adopted from NCBC 22 | Download Scientific Diagram
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