2017年2月20日 · Positive controls are exposed to a treatment that induces an effect that is expected by the experimental treatment. For example, if researchers are testing a new enzyme inhibitor, they can assay the enzyme with a known inhibitor as a positive control. Negative controls are not exposed to a treatment that would induce any expected effect.

2019年3月31日 · A negative control is a control group that is not expected to produce results. A positive control is a control group that is expected to produce results. In a simpler example, let's say you are experimenting with a new HIV test to let someone know if they have HIV.

2020年8月8日 · Positive control = should show an expected result. If you want to test if a drug heals headaches more than other brands, you can have 3 groups: a positive control, a negative control, and the experimental group.

2017年7月23日 · This shit fucked me up for a bit when I first learned. You're exactly right with positive and negative control. Inducible and Repressible isn't about the positive/negative control stuff at all! An inducible operon just means that the normal state it's in is off (because the repressing protein is active until it binds a molecule), then something comes and turns it on. …

2023年2月28日 · A negative control demonstrates what the result should look like without the desired outcome. Using our example above, adding water might spread the bacteria out on the plate, but it won’t kill them.

2020年6月30日 · I see this come up time and time again, especially with regards to loading controls - tubulin is often used as a loading control. Is a loading control a positive or negative control? The loading control does what it's supposed to (constant levels of tubulin across all lanes/conditions) and has no effect on the outcome of the experiment, so is it a negative …

2017年8月14日 · Positive control just means a group that is know to produce the desired effect, and a negative control means a normal group who is known not to produce the effect of whatever your experiment is.

2020年5月15日 · A positive control is gonna give you the result your looking for, but a negative will not.

2021年4月2日 · Negative control is important since what if that mouse for some reason naturally has some amount of uncontrolled cell growth, and your measurement shows tumor growth but high [X] isn't actually causing it?

a positive control gets treatment with a known outcome, so it can reveal problems with the experiment/show the effects of unknown variables. a negative control gets treatment that isn't expected to produce results, so it might get no treatment or a …