2.Evaluation of measurement uncertainty of welding fume in welding workplace of a shipyard.
Chinese Journal of Industrial Hygiene and Occupational Diseases 2015;33(12):934-935
OBJECTIVETo evaluate the measurement uncertainty of welding fume in the air of the welding workplace of a shipyard, and to provide quality assurance for measurement.
METHODSAccording to GBZ/T 192.1-2007 "Determination of dust in the air of workplace-Part 1: Total dust concentration" and JJF 1059-1999 "Evaluation and expression of measurement uncertainty", the uncertainty for determination of welding fume was evaluated and the measurement results were completely described.
RESULTSThe concentration of welding fume was 3.3 mg/m(3), and the expanded uncertainty was 0.24 mg/m(3). The repeatability for determination of dust concentration introduced an uncertainty of 1.9%, the measurement using electronic balance introduced a standard uncertainty of 0.3%, and the measurement of sample quality introduced a standard uncertainty of 3.2%.
CONCLUSIONDuring the determination of welding fume, the standard uncertainty introduced by the measurement of sample quality is the dominant uncertainty. In the process of sampling and measurement, quality control should be focused on the collection efficiency of dust, air humidity, sample volume, and measuring instruments.
Air Pollutants, Occupational ; analysis ; standards ; Gases ; analysis ; Uncertainty ; Welding ; Workplace ; standards
9.Effect of smoking on the microRNAs expression in pneumoconiosis patients.
Ming ZHANG ; Yanrang WANG ; Deyi YANG ; Yitao LIU ; Xin WANG ; Jundi XIA ; Louxin ZHANG ; Lianhong XIE
Chinese Journal of Industrial Hygiene and Occupational Diseases 2014;32(9):686-688
OBJECTIVETo investigate the effect of smoking on the microRNAs (miRNAs) expression in pneumoconiosis patients.
METHODSReal-time qPCR was used to measure the expression levels of miR-21, miR-200c, miR-16, miR-204, miR-206, miR-155, let-7g, miR-30b, and miR-192 in 36 non-smoking patients with pneumoconiosis and 38 smoking patients with pneumoconiosis, and the differences in expression levels between the two groups were evaluated by two-independent samples t-test.
RESULTSThe expression of miR-192 in serum showed a significant difference between non-smoking and smoking pneumoconiosis patients (P < 0.05), and it decreased gradually in smoking patients with stage I and II pneumoconiosis. In the serum of all pneumoconiosis patients, the expression level of miR-16 was the highest, while the expression level of miR-204 was the lowest.
CONCLUSIONPneumoconiosis patients have differential expression of miRNAs in serum, and smoking has an effect on the miRNAs expression in pneumoconiosis patients.
Humans ; MicroRNAs ; biosynthesis ; Pneumoconiosis ; metabolism ; physiopathology ; Polymerase Chain Reaction ; Smoking ; adverse effects
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