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Turbofan and turbojet engines are major sources of intense aircraft noise. Although turboprop-powered aircraft also are used by the . Air Force, their contribution to the overall noise environment is of relatively minor importance compared to jet-powered aircraft. Jet engines are generally more powerful and produce noise of higher magnitude than turboprop or piston aircraft engines. Also, jet engines produce a greater amount of noise in the high-frequency range, thus increasing their relative annoyance factor.

Greco et al (2008) stated that the patient population with a rising PSA post-therapy with no evidence of disease on standard imaging studies currently represents the second largest group of prostate cancer patients.  Little information is still available regarding the specificity and sensitivity of PET tracers in the assessment of early biochemical recurrence.  Ideally, PET imaging would allow one to accurately discriminate between local versus nodal versus distant relapse, thus enabling appropriate selection of patients for salvage local therapy.  The vast majority of studies show a relatively poor yield of positive scans with PSA values less than 4 ng/ml.  So far, no tracer has been shown to be able to detect local recurrence within the clinically useful 1 ng/ml PSA threshold, clearly limiting the use of PET imaging in the post-surgical setting.  Preliminary evidence, however, suggested that 11C-choline PET may be useful in selecting out patients with early biochemical relapse (PSA less than 2 ng/ml) who have pelvic nodal oligometastasis potentially amenable to local treatment.  The authors concluded that the role of PET imaging in prostate cancer is gradually evolving but still remains within the experimental realm.  Well-conducted studies comparing the merits of different tracers are needed.

Adrenocorticosteroids drugs

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