<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Anderson, D. M.</style></author><author><style face="normal" font="default" size="100%">Danielson, T.L.</style></author><author><style face="normal" font="default" size="100%">Obeidat, S.M.</style></author><author><style face="normal" font="default" size="100%">Rayson, G.D.</style></author><author><style face="normal" font="default" size="100%">Estell, R. E.</style></author><author><style face="normal" font="default" size="100%">Bai, B.</style></author><author><style face="normal" font="default" size="100%">Fredrickson, E. L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Differentiating among plant spectra by combining pH dependent photoluminescence spectroscopy with multi-way principal component analysis (MPCA)</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">bibliography/11-005.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">5</style></volume><pages><style face="normal" font="default" size="100%">1-9</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Photoluminescence spectroscopic probes offer the potential for real-time measurements of animal diet composition. Spectral emission signatures (excitation at 365 nm) from three different pH (2.2, 7.5 and 12.5) phosphate buffered saline (PBS) extracts from two grasses, Sporobolus flexuosus (Thurb. ex Vasey) Rydb., [mesa dropseed], and Pleuraphis mutica  Buckley [tobosa], two forbs, Dimorphocarpa wislizenii (Engelm.) Rollins [spectacle pod], and Sphaeralcea incana Torrey [pale globemallow], and leaves and twigs from two shrubs Flourensia cernua DC. [tarbush], and Atriplex canescens (Pursh) Nutt., [fourwing saltbush] were examined. Since pH has been shown to be pivotal in affecting extraction efficiency of other plant compounds pH seemed appropriate as an additional dimension within our multi-way principal component analysis (MPCA) to differentiate among six different plant species. In particular, MPCA allowed differentiation between Sporobolus and Pleuraphis that was not possible using only principal component analysis (PCA).  This research suggests MPCA may be a more appropriate tool than PCA when attempting to discriminate among plant species.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2011-90029</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Danielson, T.L.</style></author><author><style face="normal" font="default" size="100%">Obeidat, S.</style></author><author><style face="normal" font="default" size="100%">Rayson, G.D.</style></author><author><style face="normal" font="default" size="100%">Anderson, D. M.</style></author><author><style face="normal" font="default" size="100%">Fredrickson, E. L.</style></author><author><style face="normal" font="default" size="100%">Estell, R. E.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Photoluminescent distinction among plant life forms using phosphate buffered saline extract solutions</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">bibliography/06-029.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">60</style></volume><pages><style face="normal" font="default" size="100%">800-807</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2006-90565</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Danielson, T.L.</style></author><author><style face="normal" font="default" size="100%">Rayson, G.D.</style></author><author><style face="normal" font="default" size="100%">Anderson, D. M.</style></author><author><style face="normal" font="default" size="100%">Estell, R. E.</style></author><author><style face="normal" font="default" size="100%">Fredrickson, E. L.</style></author><author><style face="normal" font="default" size="100%">Havstad, KM</style></author><author><style face="normal" font="default" size="100%">Green, B.S.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Impact of filter paper on fluorescence measurements of buffered saline filtrates</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">bibliography/03-016.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">59</style></volume><pages><style face="normal" font="default" size="100%">601-604</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2003-90805</style></accession-num></record></records></xml>