Dr. A. Peter Snyder Profile

Dr. A. Peter Snyder

Research Biochemist at DEVCOM Chemical Biological Ctr

SPIE Involvement:

Author

Proceedings Article | 29 May 2013 Paper

Infrared (1-12 um) atomic and molecular emission signatures from energetic materials using laser induced breakdown spectroscopy

E. Kumi Barimah, U. Hömmerich, E. Brown, C. S.-C. Yang, S. Trivedi, F. Jin, P. Wijewarnasuriya, A. Samuels, A. Snyder

Proceedings Volume 8710, 87100V (2013) https://doi.org/10.1117/12.2017913

KEYWORDS: Laser induced breakdown spectroscopy, Infrared signatures, Long wavelength infrared, Sodium, Near infrared, Potassium, Infrared radiation, Chemical species, Infrared spectroscopy, FT-IR spectroscopy

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Proceedings Article | 5 May 2012 Paper

Novel utilization of the outer membrane proteins for the identification and differentiation of pathogenic versus nonpathogenic microbial strains using mass spectrometry-based proteomics approach

Rabih Jabbour, Mary Wade, Samir Deshpande, Patrick McCubbin, A. Peter Snyder, Vicky Bevilacqua

Proceedings Volume 8358, 835809 (2012) https://doi.org/10.1117/12.921254

KEYWORDS: Proteins, Pathogens, Databases, Organisms, Binary data, Bacteria, Mass spectrometry, Statistical analysis, Spectroscopy, Bioinformatics

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Proceedings Article | 5 May 2012 Paper

Biomolecule Raman spectral temporal flux from resting bacillus spores in deionized water matrix

Ashish Tripathi, Rabih Jabbour, Jason Guicheteau, Phillip Wilcox, A. Peter Snyder

Proceedings Volume 8358, 83580D (2012) https://doi.org/10.1117/12.911800

KEYWORDS: Raman spectroscopy, Principal component analysis, Organisms, Imaging spectroscopy, Proteins, Molecules, Bacteria, Visible radiation, Microscopy, Environmental sensing

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Proceedings Article | 4 June 2011 Paper

Infrared laser-induced breakdown spectroscopy emissions from energetic materials

Clayton Yang, E. Brown, Uwe Hommerich, Sudhir Trivedi, Alan Samuels, A. Peter Snyder

Proceedings Volume 8018, 80181P (2011) https://doi.org/10.1117/12.876375

KEYWORDS: Laser induced breakdown spectroscopy, Nitrogen, FT-IR spectroscopy, Infrared spectroscopy, Chemical analysis, Infrared signatures, Molecules, Explosives, Carbonates, Chemical species

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Proceedings Article | 5 May 2010 Paper

Water matrix and age effects on microorganism Raman microspectroscopy

Ashish Tripathi, Rabih Jabbour, Patrick Treado, Matthew Nelson, A. Peter Snyder

Proceedings Volume 7665, 766508 (2010) https://doi.org/10.1117/12.839852

KEYWORDS: Raman spectroscopy, Matrices, Bacteria, Organisms, Microscopes, Imaging spectroscopy, Water, Biological research, Principal component analysis, Microorganisms

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Proceedings Article | 8 May 2009 Paper

Bacterial mixture analysis with Raman chemical imaging microspectroscopy

Ashish Tripathi, Rabih Jabbour, Jason Guicheteau, Steven Christesen, Darren Emge, Janet Jensen, A. Peter Snyder

Proceedings Volume 7304, 730403 (2009) https://doi.org/10.1117/12.806456

KEYWORDS: Raman spectroscopy, Picosecond phenomena, Particles, Imaging spectroscopy, Bacteria, Microscopes, Chemical analysis, Visualization, Luminescence, Biological research

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Proceedings Article | 17 April 2008 Paper

Classification of select category A and B bacteria by Fourier transform infrared spectroscopy

Alan Samuels, A. Peter Snyder, Diane St. Amant, Darren Emge, Jennifer Minter, Mark Campbell, Ashish Tripathi

Proceedings Volume 6954, 695413 (2008) https://doi.org/10.1117/12.767292

KEYWORDS: Pathogens, Fourier transforms, FT-IR spectroscopy, Bacteria, Infrared spectroscopy, Absorption, Organisms, Optical filters, Spectroscopy, Visualization

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Proceedings Article | 26 April 2007 Paper

Biological substance characterization in water matrices with Raman microspectroscopy

Rabih Jabbour, Ashish Tripathi, Patrick Treado, Jason Neiss, Matthew Nelson, Janet Jensen, A. Peter Snyder

Proceedings Volume 6554, 65540I (2007) https://doi.org/10.1117/12.707777

KEYWORDS: Raman spectroscopy, Proteins, Matrices, Bacteria, Organisms, Principal component analysis, Imaging spectroscopy, Microscopes, Mahalanobis distance, Laser damage threshold

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Proceedings Article | 26 April 2007 Paper

Detection and identification of a water mixture of E. coli cells and B. subtilis spores with Raman chemical imaging microscopy

Ashish Tripathi, Rabih Jabbour, Patrick Treado, Jason Neiss, Matthew Nelson, Janet Jensen, A. Peter Snyder

Proceedings Volume 6554, 65540J (2007) https://doi.org/10.1117/12.707788

KEYWORDS: Raman spectroscopy, Microscopes, Particles, Imaging spectroscopy, Chemical analysis, Principal component analysis, Bacteria, Optical spheres, Visualization, Microscopy

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Proceedings Article | 24 June 2002 Paper

Field detection and identification of a bioaerosol suite by pyrolysis-gas chromatography-ion mobility spectrometry

A. Peter Snyder, Ashish Tripathi, Waleed Maswadeh, Jim Ho, Mel Spence

Proceedings Volume 4722, (2002) https://doi.org/10.1117/12.472255

KEYWORDS: Aerosols, Atmospheric particles, Sensors, Biological research, Ions, Spectroscopy, Proteins, Quartz, Ionization, Liquids

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Improvements were made to a pyrolysis-gas chromatography-ion mobility spectrometry stand-alone biodetector to provide more pyrolyzate compound information to the IMS detector module. Air carrier gas flowing continuously through the pyrolysis tube, the rate of air flow, and pyrolysis rate were found to improve the relative quality and quantity of pyrolyzate compounds detected by the IMS detector compare to earlier work. These improvements allowed a greater degree of confidence in the correlation of biological aerosols obtain in outdoor testing scenarios to a standard GC-IMS biological aerosol dataset. The airflow improvement allowed more biomarker compounds to be observed in the GC-IMS data domain for aerosols of Gram-negative Erwinia herbicola (EH) and ovalbumin protein as compared to previous studies. Minimal differences were observed for Gram-positive spores of Bacillus subtilis var. globigii (BG) from that of earlier work. Prior outdoor aerosol challenges dealt with the detection of one organism, either EH or BG. Biological aerosols were disseminated in a Western Canadian prairie and the Py-GC-IMS was tested for its ability to detect the biological aerosols. The current series of outdoor trials consisted of three different biological aerosol challenges. Forty-two trials were conducted and a simple area calculation of the GC-IMS data domain biomarker peaks correlated with the correct bioaerosol challenge in 30 trials. In another 7 trials, the status of an aerosol was determined to be biological in origin. Two additional trials had no discernible, unambiguous GC-IMS biological response, because they were black water sprays. Reproducible limits of detection were at a concentration of less than 0.5 bacterial analyte-containing particles per liter of air (ACPLA). In order to realize this low concentration, an aerosol concentrator was used to concentrate 2000 liters of air in 2.2 minutes. Previous outdoor aerosol trials have shown the Py-GC-IMS device to be a credible detector with response to determining the presence of a biological aerosol. The current series of outdoor trials has provided a platform to show that the Py-PC-IMS can provide information more specific than a biological or non-biological analysis to an aerosol when the time of dissemination is unknown to the operator. The Py-GC-IMS is shown to be able to discriminate between aerosols of a Gram-positive spore, a Gram-negative bacterium and a protein.

Showing 5 of 10 publications

Conference Committee Involvement (2)

Chemical and Biological Sensing V

12 April 2004 | Orlando, Florida, United States

Chemical and Biological Sensing IV

21 April 2003 | Orlando, Florida, United States

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