Fingerprinting particle origins according to their size distribution at a UK rural site

Receptor modelling of both particle composition and size distribution from a background site in London, UK

DNA Fingerprinting of Pearls to Determine Their Origins

We report the first successful extraction of oyster DNA from a pearl and use it to identify the source oyster species for the three major pearl-producing oyster species Pinctada margaritifera, P. maxima and P. radiata. Both mitochondrial and nuclear gene fragments could be PCR-amplified and sequenced. A polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay in the i...

Application of absolute principal component analysis to size distribution data: identification of particle origins

Absolute principal component analysis can be applied, with suitable modifications, to atmospheric aerosol size distribution measurements. This method quickly and conveniently reduces the dimensionality of a data set. The resulting representation of the data is much simpler, but preserves virtually all the information present in the original measurements. Here we demonstrate how to combine the s...

Particle size distribution and particle mass measurements

Particle size distribution and particle mass measurements at urban, near-city and rural level in the Copenhagen area and Southern Sweden M. Ketzel , P. Wåhlin, A. Kristensson, E. Swietlicki, R. Berkowicz, O. J. Nielsen, and F. Palmgren Department of Atmospheric Environment, National Environmental Research Institute, Roskilde, Denmark Division of Nuclear Physics, Physics Department, Lund Univers...

What is a Continuous Particle Size Distribution ?

Differential Distribution: The differential distribution shows the relative amount* at each size. For example, for the one shown here, using a ruler to draw horizontal and vertical lines, one can determine that the differential amount at 14.5 nm is about 40 while at 18 nm it is about 20. Therefore, the differential distribution is telling us there is twice the amount at 14.5 nm compared to the ...