An artifact that occurs when the subject being imaged moves out of the field of view during a SPECT acquisition:

What would cause the artifact seen here?  

Which of the following filters is a low-pass filter?

A mispositioning of counts around the edge of a detector caused by internal reflection of light is known as:

Which of the following is an example of a solid state detector?

Which of the following filters would produce the smoothest image?

You have purified a new peptide hormone.  To determine its amino acid sequence you have digested the polypeptide with trypsin and in a separate reaction you have cleaved the polypeptide with cyanogen bromide.    Cleavage with trypsin yielded 5 peptides that were sequenced by Edman degradation as shown in the following.    Ser─Leu Asp─Val─Arg Val─Met─Glu─Lys Ser─Gln─Met─His─Lys Ile─Phe─Met─Leu─Cys─Arg   Cleavage with cyanogen bromide yielded 4 peptides that were sequenced by Edman degradation:   His─Lys─Ser─Leu Asp─Val─Arg─Val─Met Glu─Lys─Ile─Phe─Met Leu─Cys─Arg─Ser─Gln─Met   Determine the sequence of the intact protein.

A sequence of amino acids in a certain protein is found to be -Ser-Gly-Pro-Gly-.  The sequence is most probably part of a(n):

In general molecular chaperone proteins function by

Which one of the representations describes the oligopeptide shown below?