@article {50433,
	title = {Photoluminescent distinction among plant life forms using phosphate buffered saline extract solutions},
	journal = {Applied Spectroscopy},
	volume = {60},
	number = {7},
	year = {2006},
	month = {2006},
	pages = {800-807},
	abstract = {Photoluminescence of plant extract solutions has been investigated for discrimination of plant life forms (grasses, forbs and shrubs) using principle componet analysis (PCA).  Clippings from each of six plant species representing three different plant life forms potentially found in the diets of free-ranging herbivores in the Chihuahuan Desert of North America were investigated for possible discernment.   These plants included Sporobolus flexuosus (mesa dropseed, a grass), Pleuraphis mutica (tobosa, a grass), Dimorphocarpa wislizenii (spectacle pod, a forb), Sphaeralcea incana (pale globemallow, a forb), Flourensia cernua leaves (tarbush, a shrub), and Atriplex canescens leaves and stems (fourwing saltbush, a shrub). Emission spectra (370-600 nm) from phosphate buffered saline (PBS) extract solutions (pH 2.2, 7.5 and 12.5) were recorded for each plant with excitation at 365 nm. Use of PBS minimized chlorophyll interference.  Discernment among plant life forms within these plant species was achieved.},
	keywords = {PCA, photoluminescence, plant extract, principel componet analysis},
	url = {/files/bibliography/06-029.pdf},
	author = {T.L. Danielson and S. Obeidat and G.D. Rayson and D.M. Anderson and E.L. Fredrickson and Richard E. Estell}
}
@article {50760,
	title = {Impact of filter paper on fluorescence measurements of buffered saline filtrates},
	journal = {Talanta},
	volume = {59},
	number = {3},
	year = {2003},
	month = {March 1, 2003},
	pages = {601-604},
	abstract = {A fluorescent contaminate has been observed in phosphate buffered saline filtrates using a commercially available filter paper.  The fluorescence of this material was observed to exhibit a maximum signal at 440.0 nm when excited at 365 nm.  This could have significant implications in the design and implementation of sample processing protocols when using fluorescence detection of trace components.},
	url = {/files/bibliography/03-016.pdf},
	author = {T.L. Danielson and G.D. Rayson and D.M. Anderson and Richard E. Estell and E.L. Fredrickson and Kris Havstad and Green, B.S.}
}
@conference {50850,
	title = {Spectral deconvolution of fllourescence spectra from plant extracts},
	booktitle = {44th Rocky Mountain Conference on Analytical Chemistry},
	year = {2002},
	month = {July 28-August 1},
	pages = {134},
	address = {Denver, CO},
	abstract = {Fluorescence emission spectra have been observed to yield information pertaining to the identification of plant species.  One approach to acquiring these characteristic spectra has been to record the spectral signature resulting from an extract of the plant.  Often these spectra have been overwhelmed by the fluorescence from chlorophyll species.  In an effort to acquire spectral information from less ubiquitous molecular species, plant samples have been extracted using phosphate buffered saline solutions.  This has resulted in the acquisition of emission spectra from 370 to 620 nm in the absence of the red chlorophyll fluorescence.  The combination of fluorescent and absorbing molecular species extracted from each sample of plant material provides an identifying spectral signature.  Variation in solution pH has also been found to provide yet another dimension to the total fluorescence response surface.  The results of a study of six plants common to the northern Chihuahuan Desert will be presented.  The implications of these findings on the development of a fluorescence-based technique for the identification of plants from pre- and post-digestive samples will also be discussed.},
	author = {T.L. Danielson and G.D. Rayson and Anderson, E.M. and Richard E. Estell and E.L. Fredrickson and Kris Havstad}
}
@conference {51064,
	title = {UV-induced fluorescence for the discernment of plant types from pre-and post-digested plant material},
	booktitle = {27th Annual Meeting, Federation of Analytical Chemistry and Spectroscopy Societies},
	year = {2000},
	month = {September 2000},
	pages = {Abstract p. 267},
	address = {Nashville, TN},
	abstract = {It has previously been determined that plant material fluoresces in two regions of the visible spectrum.  The dominant chlorophyll fluorescence is found in the 600-800 nm region, while that, of yet unknown species, is observed in the 400-600 nm region.  It was the goal of this study to determine if the blue-green fluorescence can act as a spectral signature  for characterizing plant materials.  The fluorescence spectra of samples o 3 plant forms, grasses, forbes and shrubs, have been studied.  Utilizing the 400-600 nm region of the fluorescence spectrum, we were able to distinguish each of the three plant forms.  Further studies on identifying plant species by this blue-green fluorescence will be described.  With the aid of curve fitting programs and deconvolution methods, the emission spectra can supply information on the identity and contribution of the fluorescing compounds within the plant.  The deconvolution and curve  fitting of six plant species, Sporobolus flexuosus, Hilaria mutica, Dithyrea wislizeni, Sphaeralcea spp., Flourensia cernua, and Atriplex canescens, were performed.  The results identified at least 4 emission bands within the 400-600 nm region.  Within these bands, each plant species has a characteristic contribution.  The application of this method to characterizing pre- and post-digested plant material will be discussed. The use of this technique to monitoring of feeding habits and dietary intake of free-ranging herbivores will also be discussed.},
	keywords = {digested, plant material, plant types, UV-induced fluorescence},
	author = {T.L. Danielson and G.D. Rayson and D.M. Anderson and Richard E. Estell and E.L. Fredrickson and Kris Havstad}
}
