What effect does low differential pressure have on sample flow?

When considering the effect of low differential pressure on sample flow, the correct choice highlights that it allows the cells to pass through the interrogation point one at a time. In cytometry, particularly in flow cytometry, achieving a streamlined and orderly flow of cells is crucial for accurate detection and analysis. Low differential pressure creates a gentler flow environment, which helps in minimizing turbulence and maintaining a steady stream of single cells rather than clumps. This is essential for ensuring that each cell can be individually interrogated by the laser and measured for its specific properties, such as size and fluorescence.

In contrast, higher differential pressures may cause a more chaotic flow, leading to the potential for cell aggregation and data that can be difficult to interpret. Recognizing the importance of maintaining a stable, single-cell flow allows for more precise characterizations and analyses in cytometric applications. Thus, the relationship between low differential pressure and the orderly passage of cells through the detection system is critical for effective cytometric measurements.