Beverly S. Cohen

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BACKGROUND Depression of peripheral blood cells is a well-known indicator of benzene hematotoxicity. Previous studies of its effects on specific types of blood cells have yielded inconsistent results. We examine hematological findings and their possible relations with exposure markers validated in a recent biomarker project conducted in Tianjin, China. (More)
Obsessive-compulsive disorder (OCD) has been linked to altered neurological function following head trauma, encephalitis, abnormal birth events, and Gilles de la Tourette's syndrome. Abnormalities in computed tomographic scans, electroencephalograms, positron emission tomographic scans, and evoked potentials have been described in this disorder, but are(More)
Albumin adducts of benzene oxide (BO-Alb) and 1,4-benzoquinone (1,4-BQ-Alb) were investigated among 134 workers exposed to benzene and 51 unexposed controls in Tianjin, China. Concentrations of both adducts increased with benzene exposure [range = 0.07-46.6 parts/million (ppm); median = 3.55 ppm] and with urinary cotinine. Adduct levels were less than(More)
This report is part of an extensive biomarker study conducted in a Chinese occupational population with benzene exposures ranging from 0.06 to 122 ppm (median exposure of 3.2 ppm). All urinary benzene metabolites measured in this study were significantly elevated after exposure to benzene at or above 5 ppm. Among these metabolites, however, only(More)
The effects of stepwise concentration changes of K+ and HCO 3 − in the basolateral solution on the basolateral membrane potential (V bl) of proximal tubule cells of the doubly-perfusedNecturus kidney were examined using conventional microelectrodes. Apparent transference numbers were calculated from changes inV bl after alterations in external K+(More)
This study was conducted to validate biomarkers for early detection of benzene exposure and effect in 2 phases. The main purpose of phase 1 was to determine whether these biomarkers could reliably detect differences between workers with high exposure levels and unexposed subjects, which is the minimal screening criterion for a biomarker assay. Phase 2 of(More)
Two methods, the measurement of the response of the basolateral membrane potential (V bl) of proximal tubule cells ofNecturus to step changes in basolateral K+ concentration, and cellular cable analysis, were used to assess the changes in basolateral potassium conductance (G K) caused by a variety of maneuvers. The effects of some of these maneuvers on(More)
Sodium lactate infusions induce panic attacks in patients with panic disorder, but not in normal controls, by an unknown mechanism. We studied the plasma cortisol response to infusion of 0.5 mol/L of sodium lactate in 103 patients with panic disorder or agoraphobia with panic attacks, and 32 normal controls. Baseline cortisol levels did not distinguish(More)