Idea Ripper // ArchiveCards: 1555 [Live] | Updated: 2026-10-14
Card #c912IR // #c912Synthesis

Before trusting the picture, estimate how much sensor is actually in the cell. The authors suggest checking the microscope against samples of known strength and correcting for the tissue's own faint glow. It's hard and the answer is rough, but a rough number beats assuming zero.

— In our words · Source: An Inconvenient Truth: Calcium Sensors Are Calcium Buffers (Shane M. McMahon & Meyer B. Jackson)

[Use when]

When results from different cells, animals, or labs disagree. Check whether they were simply watched with different amounts of sensor.

[Why it matters]

How much the signal gets distorted depends on how much sensor is in there. Without even a ballpark figure, you can't tell a real result from a side effect of how heavily the cell was loaded.

More from An Inconvenient Truth: Calcium Sensors Are Calcium Buffers

#c909To watch brain cells work, scientists fill them with tiny sensors that glow when they catch calcium, the cell's “go” signal. But catching…When a measurement has to grab, hold, or touch the thing it's measuring. Ask how much the grip is changing… #c910Don't ask whether the sensor is changing the cell. If you can see it glowing, it is. Start from that and work out how much, instead of…When you're tempted to trust a reading because the tool “shouldn't” affect anything. #c911Sensors that hold calcium loosely change the signal less. The catch: they also glow less, so they're harder to see. You're trading a…When choosing how hard to look: more sensitivity usually means more interference.