Magnetic immunoassay
Magnetic immunoassay is a way to detect very small amounts of substances (like bacteria or chemicals) using magnets. The way this works is that scientists attach a special kind of molecule called an "antibody" to magnets. These antibodies attach to substances that they recognize like a key in a lock.
To detect something, scientists put a sample of liquid (like blood) into a test tube, which contains the antibodies. They then pass a magnet over the test tube, and the antibodies stick to anything they recognize. The magnets are then powerful enough to pull those substances out of the sample so that they can be identified. This is how scientists can detect very small amounts of substances that would be too hard to see or measure otherwise.
To detect something, scientists put a sample of liquid (like blood) into a test tube, which contains the antibodies. They then pass a magnet over the test tube, and the antibodies stick to anything they recognize. The magnets are then powerful enough to pull those substances out of the sample so that they can be identified. This is how scientists can detect very small amounts of substances that would be too hard to see or measure otherwise.