The Synthesis and Analysis of the Tripeptide Tyrosine-Glycine-Tyrosine

The name protein is taken from the Greek proteios , which means first. This name is indeed well chosen, for proteins are the substance of life. Chemically, proteins are high polymers, and a simple protein molecule may contain hundreds or thousands of the twenty-odd amino acid units. Hence the possibilities for variation in protein structure are almost infinite

Magnetic Resonance Imaging Tendon Integrity Assessment After Arthroscopic Partial-Thickness Rotator Cuff Repair

Our goal was to assess the integrity of the repaired rotator cuff in patients with partial-thickness rotator cuff tears who underwent a technique of tear completion followed by surgical repair, using post-repair magnetic resonance imaging (MRI) at a minimum of 2 years' follow-up. An all-arthroscopic surgical technique was used for these marked partial-thickness tears, by use of double-loaded footprint anchors and/or lateral sutures or anchors as appropriate for tissue quality. A total of 22 patients who had completion of the tear followed by repair were reimaged with 2-sequence noncontrast MRI to determine the integrity of the rotator cuff repair at a minimum of 2 years postoperatively. Of the 22 patients, 18 (82%) had no evidence of a full-thickness or near full–thickness defect on follow-up MRI. The presence of a defect on follow-up MRI (18%) did not correlate with clinical results. Younger patients showed a trend toward maintaining better integrity. In 18 of 22 patients (82%) with partial-thickness rotator cuff tears treated with tear completion followed by surgical repair, there was no evidence of a full-thickness or near full–thickness defect on follow-up MRI at a minimum of 2 years. The patient's age may be an important factor in tendon healing. Level IV, therapeutic case series