ABSTRACT
Large amount of data including chemical composition and size information of individual particles would be generated in the measurement of aerosol particles using atmospheric aerosol time-of-flight mass spectrometry ( ATOFMS ) . Our home-made ATOFMS was used to measure the indoor individual aerosol particles in real-time for 24 h, and the obtained mass spectrometric data were clustering analysis by self-organizing map ( SOM ) because of its ability of vector quantization and data dimensionality reduction. 20 classification results were got which includedCalcium-Containing,Salt+Secondary particles,Secondary particles,Organic Amines,K+-Rich Organics andSoil particles, etc. Compared with previous mass spectrometric methods, SOM is a natural visualization tool, more classification results can be obtained. This classification information would be useful to assess the response and toxicity of atmospheric aerosol particles and identify the origin of atmospheric aerosol particles.
ABSTRACT
The association of the progress of diabetic nephropathy with the sclerosis of major artery was investigated.Carotid intima-media thickness (CIMT) was positively correlated with urinary albumin and creatinine ratio,and negatively correlated with glomerular filtration rate in diabetes group,suggesting that thickened CIMT may predict the increasing risk of clinical nephropathy in the patients with microalbuminuria.