Laser power dependence of mass spectral signatures from individual bacterial spores in bioaerosol mass spectrometry - Czerwieniec, Gregg A.; Fergenson, David P.; Frank, Matthias.; Gard, Eric E.; Horn, Joanne M.; Lebrilla, Carlito B.; Pitesky, Maurice E.; Russell, Scott C.; Steele, Paul T.; Tobias, Herbert J.