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Studies the impact of mutations within the putative Ca2+ binding lumenal interhelical a-b loop of the photosystem II D1 protein. Double flash measurements of oxygen release; S2 and S3 decay measurements in the isolated membranes; Measurements of the flash interval dependence of photoactivation; Destabilization of the intermediates of photoactivation in the a-b loop mutants.

Case Presentation: A 69-year-old man consulted for a 3-day history of fever, wet cough, and yellow-green phlegm. He denied having any dyspnea, chest pain, hemoptysis, swallowing disorders, choke, chills, asthenia, anorexia, or weight loss. He reported a continuous dry cough and three episodes of pneumonia in the past 4 years. He was a nonsmoker, without any other personal or familial medical history. He had no known professional exposure. He was born and lived in Vietnam but had no known contact with TB in his family or workplace. He was never imprisoned or homeless and did never travel abroad. [ABSTRACT FROM AUTHOR]