Yen Ping Cheung

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In order to determine the prevalence and molecular basis of alpha-thalassemia (thal) among Filipinos, a total of 2954 Filipinos in Taiwan were enrolled in this study. A complete blood count was done for every subject. Those with microcytosis (MCV less than 82.5 fl) were studied with hemoglobin (Hb) high-performance liquid chromatography to determine the(More)
Emissions of air pollutants from aircraft in large urban areas are a health concern to nearby residents. This study examined hourly concentrations of CO, NOx, SO2, and respirable suspended particles (RSP) taken in the vicinity of Hong Kong International Airport (HKIA) and Los Angeles International Airport (LAX). The LAX data cover the period August 1997(More)
A total of 71 air samples were collected in Hong Kong area from November 2001 to February 2003 using a highvolume air sampler and a high-volume cascade impactor with five atmospheric pressure stages. The Be radioactivity on each stage was measured using a high-efficiency germanium gamma-ray spectrometer. From the radioactivity of stages, the total airborne(More)
OBJECTIVE Down's syndrome (DS) is an important cause of mental retardation. This study investigated the parental origin of the extra chromosome 21 in DS patients. METHODS Fourteen families each with a DS patient were recruited for analysis of nine microsatellite markers on chromosome 21. We collected DNA from both parents and the patient and used(More)
Soils from a local reservoir had been analyzed for their physical and chemical properties, distribution coefficients Kd and sorption rates for 137Cs. It was found that soils in Hong Kong were relatively low in organic matter and more acidic than those in some other countries. In sorption experiments, the rates of decrease in water activity concentration(More)
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