Robert C. Smith

Learn More
A new UV submersible spectroradiometer has been employed to determine the diffuse attenuation coefficient for irradiance in the clearest natural waters [K(w)(lambda)] with emphasis on the spectral region from 300 to 400 nm. K(w)(lambda) can be related to the inherent optical properties of pure water, in particular the total absorption coefficient(More)
BACKGROUND Communication problems in health care may arise as a result of healthcare providers focusing on diseases and their management, rather than people, their lives and their health problems. Patient-centred approaches to care delivery in the patient encounter are increasingly advocated by consumers and clinicians and incorporated into training for(More)
The springtime stratospheric ozone (O3) layer over the Antarctic is thinning by as much as 50 percent, resulting in increased midultraviolet (UVB) radiation reaching the surface of the Southern Ocean. There is concern that phytoplankton communities confined to near-surface waters of the marginal ice zone will be harmed by increased UVB irradiance(More)
OBJECTIVE Prior studies using radiography have examined the relationship of ureteral stone size and location to the probability of spontaneous passage. Given the improved accuracy and new role of unenhanced CT in the diagnosis of acute ureterolithiasis, we studied the relationship of stone size and location as determined by unenhanced CT to the rate of(More)
PURPOSE To analyze overall survival (OS) and update efficacy data for letrozole versus tamoxifen as first-line therapy in postmenopausal women with locally advanced or metastatic breast cancer. PATIENTS AND METHODS This multicenter phase III trial randomly assigned 916 patients with hormone receptor-positive or unknown tumors letrozole 2.5 mg (n = 458) or(More)
PURPOSE To compare non-contrast-enhanced computed tomography (CT) and intravenous urography (IVU) in the evaluation of patients who present with acute flank pain and in whom ureteric obstruction is suspected. MATERIALS AND METHODS The findings at non-contrast-enhanced CT and IVU in 20 patients with acute flank pain were compared for the presence or(More)
Schizophrenic patients have among the highest rates of smoking of any group of patients. Previous studies have identified psychophysiological and potential nicotinic receptor abnormalities which may be associated with this phenomenon. The effects of acute smoking or acute administration of nicotine nasal spray, after smoking abstinence, on negative symptoms(More)
OBJECTIVE The purpose of our study was to determine the value of secondary signs of ureteral obstruction on helical unenhanced CT. MATERIALS AND METHODS Over a 19-month interval, 312 patients with acute flank pain were imaged with helical unenhanced CT. Ureteral stone disease was confirmed to be present in 109 patients and confirmed to be absent in 111(More)
Schizophrenics have among the highest rates of cigarette smoking. Some studies indicate that cigarette smoking or nicotine may ameliorate some of the cognitive or theoretically related neurophysiological deficits seen in schizophrenic patients. This study investigated the effects of nicotine nasal spray on measures of attention, verbal memory, and(More)
OBJECTIVES The purpose of our study was to determine the value of unenhanced CT in the diagnosis of acute flank pain. We determined the accuracy of unenhanced Ct for stone detection as well as the detection of abnormalities unrelated to stone disease. MATERIALS AND METHODS During an 18-month interval, 292 patients with acute flank pain were imaged with(More)