In the hybridoma case study (Figure 3.2), the authors conclude that the continuous discharge strategy “operated well only within a narrow range.” In context, “operated well” most closely means:

Question

BlackTom AI · Accepted Answer

Minimizing cell disruption and avoiding unstable pressure/flow behavior are the critical performance criteria for continuous discharge when processing fragile mammalian hybridoma cultures.

1) Relevant knowledge points and concepts
- Hybridoma cells are shear-sensitive; centrifugation and discharge events can cause cell rupture (lysis) if shear or pressure transients are too high.  
- Continuous discharge centrifugation must balance sediment consolidation, discharge frequency, feed flow, and bowl speed; outside a limited parameter window, discharge can produce pressure/flow instabilities (surging, pulsation) and mechanical stress on cells.  
- “Operated well” in process-engineering context typically refers to stable hydrodynamics and preservation of cell/product integrity during extended operation.

2) Step-by-step reasoning
- The phrase “operated well only within a narrow range” implies the strategy worked reliably only when key variables were tightly controlled.  
- If operation were judged by sediment concentration alone (option A), that would be about separation efficiency, not operational stability or cell viability—so it does not explain the narrow operating window.  
- If the method removed downstream steps or eliminated optimization (options C and D), that would imply robustness over a wide range, contradicting “narrow range.”  
- The practical failure modes when leaving that narrow window are cell damage and unstable pressure/flow; these directly explain why only a narrow window yields acceptable results.

3) Intermediate steps (qualitative)
- Increase feed rate or change discharge timing → larger shear/pressure transients → cell disruption or flow instabilities.  
- Decrease feed rate or alter bowl speed outside optimum → inadequate consolidation or pulsating discharge → unstable operation.  
These causal links show why only a narrow set of parameters yields good operation.

4) Why the correct answer is correct
- “Minimized cell disruption and avoided unstable pressure/flow behavior” directly captures both the biological (cell integrity) and engineering (stable flow/pressure) criteria that define “operated well” for continuous discharge of hybridoma cultures.

5) Why other options are incorrect
- A: Focuses solely on sediment concentration, not cell viability or hydraulic stability.  
- C: Claims no additional downstream steps were needed, which is not supported and would imply broad robustness.  
- D: States discharge optimization was unnecessary, contradicting the phrase “only within a narrow range.”

6) Conclusion
Therefore, the best interpretation of “operated well” is that the continuous discharge strategy minimized cell disruption and avoided unstable pressure/flow behavior, which matches the provided answer.

In the hybridoma case study (Figure 3.2), the authors conclude that the continuous discharge strategy “operated well only within a narrow range.” In context, “operated well” most closely means: 单项选择题

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