نتایج جستجو برای: chinese miners
تعداد نتایج: 139830 فیلتر نتایج به سال:
To investigate the high death rates for bronchitis in South Wales miners a survey of respiratory symptoms and ventilatory capacity in 90% of a random sample of 600 men between the ages of 35 and 64 and 200 women between 55 and 64 living in the Rhondda Fach was carried out. The sample of men was stratified by age and occupation, 100 miners and ex-miners, and 100 non-miners being studied in each ...
The clinical, histological, and biological features of 157 lung cancers in coal miners and ex-miners are presented. In most respects-age, bronchoscopic appearances, histological type, and symptoms -the two groups are similar. A high incidence of dyspnoea in the miners was attributed to the concurrence of chronic bronchopulmonary disease. A striking feature was the lower frequency with which lun...
In a 30 year follow up study of 8526 men aged 20 and over in the Rhondda Fach 99.9% of the population was traced. Generally, the results are similar to those found in a 20 year follow up of the same subjects. Miners and ex-miners had an excess mortality compared with non-miners, but within the former only those who had had categories B and C pneumoconiosis showed a raised mortality. Category A ...
The mining process in the Blockchain is very resource intensive, therefore, miners form coalitions to verify each block of transactions in return for a reward where only the first coalition that accomplishes the proof-of-work will be rewarded. This leads to intense competitions among miners and consequently dishonest mining strategies, such as block withholding attack, selfish mining, eclipse a...
OBJECTIVES Working in mines and quarries has been associated with an elevated lung cancer risk but with inconsistent results for coal miners. This study aimed to estimate the smoking-adjusted lung cancer risk among coal miners and compare the risk pattern with lung cancer risks among ore miners and quarrymen. METHODS We estimated lung cancer risks of coal and ore miners and quarrymen among 14...
SETTING South African miners suffer the highest tuberculosis (TB) rates in the world. Current efforts to stem the epidemic are insufficient. Historical legacies and persistent disease burden demand innovative approaches to reshape health care delivery to better serve this population. OBJECTIVE To characterize social and behavioral health determinants for successful TB care delivery and treatm...
Mercury (Hg) exposure is a public health concern due to its persistence in the environment and its high toxicity. Such toxicity has been associated with the generation of oxidative stress in occupationally exposed subjects, such as artisanal gold miners. In this study, we characterize occupational exposure to Hg by measuring blood, urine and hair levels, and investigate oxidative stress and DNA...
INTRODUCTION Small-scale gold miners in Ghana have been using mercury to amalgamate gold for many years. Mercury is toxic even at low concentration. We assessed occupational exposure of small-scale gold miners to mercury in Prestea, a gold mining town in Ghana. METHODS We conducted a cross-sectional study in which we collected morning urine samples from 343 small-scale gold miners and tested ...
Information on radiographic evidence of coal workers' pneumoconiosis (CWP) is presented for a group of 3,194 underground bituminous coal miners and ex-miners examined between 1985 and 1988. Prevalence of CWP was related to estimated cumulative dust exposure, age, and rank of coal. On the basis of these data, miners of medium to low rank coal, who work for 40 years at the current federal dust li...
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