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Tracer

tracer

1. An element or compound containing atoms that can be distinguished from their normal counterparts by physical means (e.g., radioactivity assay or mass spectrography) and can thus be used to follow (trace) the metabolism of the normal substances.

2. A coloured substance (e.g., a dye) used as a tracer to follow the flow of water.

3. An instrument used in dissecting out nerves and blood vessels.

4. A mechanical device with a marking point attached to one jaw and a graph plate or tracing plate attached to the other jaw; used to record the direction and extent of movements of the mandible.

See: tracing.

Origin: M.E. Track, fr. O. Fr. Tracier, to make one's way, fr. L. Traho, pp. Tractum, to draw, _ -er, agent suffix


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Re: Protein tansfer

Yes the tracer is a radioactive amino acid. It doesn't go into specifics, i think it's an A-level standard question. The time frame is 20 minutes so i'm not sure about the low rate for the nucleus and mitochondria being down to ...

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by hartraft
Thu Oct 29, 2009 7:28 pm
 
Forum: Cell Biology
Topic: Protein tansfer
Replies: 5
Views: 2294

Protein tansfer

Anyway, what is the tracer? Some amino acid?

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by JackBean
Thu Oct 29, 2009 2:51 am
 
Forum: Cell Biology
Topic: Protein tansfer
Replies: 5
Views: 2294

Protein tansfer

Both the nucleus and the mitochondrion have double membranes. Takes longer for the tracer to enter a double membrane? as oppose to the golgi and RER? Or any other reason that the tracer would be slower to enter and be retained in these organelles?

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by kolean
Thu Oct 29, 2009 12:47 am
 
Forum: Cell Biology
Topic: Protein tansfer
Replies: 5
Views: 2294

Protein tansfer

Hello, I have been a question like this. Autoradiography was used to study the production of proteins in liver cells by using a radioactive tracer over a time period of 20 minutes. The results are then given from which i have plotted a graph that shows the Nucleus: very low amount of radioactive ...

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by hartraft
Tue Oct 27, 2009 9:42 pm
 
Forum: Cell Biology
Topic: Protein tansfer
Replies: 5
Views: 2294

Transpiration Please help Me

... is active transport. There is evidence to support the theory from ringing experiments, measurements of hydrostatic pressure and radioactive tracer experiments. Dougal

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by Dougalbod
Thu Oct 08, 2009 11:20 am
 
Forum: Botany Discussion
Topic: Transpiration Please help Me
Replies: 29
Views: 25332
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