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When a sample give negative result for ninhydrin and biuret test but the same sample give positive result for xanthoprotic testwhy?
A sample that gives negative results for both the ninhydrin and biuret tests suggests the absence of free amino acids and proteins, respectively. However, a positive result for the xanthoprotic test indicates the presence of aromatic amino acids, such as tryptophan or tyrosine, which can react with nitric acid to form a yellow compound. This discrepancy suggests that while the sample does not contain free amino acids or proteins in detectable amounts, it does contain aromatic amino acids bound within a structure that does not release them under the conditions of the ninhydrin or biuret tests.
What are acids considered to be what because they are positive?
Cations
Does novocaine test positive for LSD?
Novocain tests positive for cocaine, not LSD.
Does Oxycontin tests positive for opiates?
yes
When acids in water what positive ion is produced in excess?
When acids in water hydrogen positive ion is produced in excess. It is this hydrogen positive ion that gives acidity of a solution.
What is the function of treponemal antibody tests?
Treponemal antibody tests are used to rule out false-positive results on reagin tests.
Is it possible to have 2 out of 3 positive pregnancy tests be false?
A false positive pregnancy test is extremely rare, so I would say no, if the tests read positive you are most likely pregnant.
Biochemical tests for Salmonella and Shigella?
urease - negative ONPG - positive Lysine - positive
What are flash tests used for?
Flash tests are used for conjunction with and electronic thermal flash detector. These test methods are suitable for flash point tests on biodiesels as fatty acids.
How do you get positive results from a qualitative tests?
If you get two lines
Will kava kava or passionflower show positive results in drug tests?
no they will not show up on drug tests
What happens if Coombs' tests are positive?
If the test is positive, the antigens that react will narrow the search for a cause
