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Articles 91 - 120 of 206
Full-Text Articles in Life Sciences
Ethanol Production From Grain, Department Of Agriculture And Food, Western Australia
Ethanol Production From Grain, Department Of Agriculture And Food, Western Australia
All other publications
Two methods are currently used to produce ethanol from grain: wet milling and dry milling. The adjectives ‘wet’ and ‘dry’ describe the method, not the product. The different methods affect both the profitability and logistics. Dry mills produce ethanol, distillers' grain and carbon dioxide (Figure 1). The carbon dioxide is a co-product of the fermentation, and the distillers’ dried grain with solubles (DDGS) is a non-animal based, high protein livestock feed supplement, produced from the distillation and dehydration process. If distillers' grains are not dried, they are referred to as distillers' wet grain (DWG). Wet mill facilities are ‘bio-refineries’ producing …
A Sensitive Subject: Haploinsufficiency Of The Yeast Vma13 Gene In Simple And Compound Heterozygotes, Jason Michael Rizzo
A Sensitive Subject: Haploinsufficiency Of The Yeast Vma13 Gene In Simple And Compound Heterozygotes, Jason Michael Rizzo
Honors Capstone Projects - All
Vacuolar-proton translocating-ATPases (V-ATPases) are the membranebound transporters responsible for controlling pH levels in intracellular compartments. The V-ATPase enzyme is a multi-subunit complex consisting of two distinct domains, a cytosolic V1 region and a membrane-bound Vo domain. While the interface between V1 and Vo is not as well understood, studies suggest the possibility of multiple peripheral stalks tethering the complex. In response to glucose deprivation, the V1 and Vo sectors of the enzyme are capable of dissociating into separate, and inactive, domains as a means of regulation. At least 4 V1 subunits (C, H, E, and G) are believed to form …
Evaluation Of Toxicity Following Electrically Mediated Interleukin-12 Gene Delivery In A B16 Mouse Melanoma Model, Loree Heller, Kathleen Merkler, Jeffrey Westover, Yolmari Cruz, Domenico Coppola, Kaaron Benson, Adil Daud, Richard Heller
Evaluation Of Toxicity Following Electrically Mediated Interleukin-12 Gene Delivery In A B16 Mouse Melanoma Model, Loree Heller, Kathleen Merkler, Jeffrey Westover, Yolmari Cruz, Domenico Coppola, Kaaron Benson, Adil Daud, Richard Heller
Bioelectrics Publications
PURPOSE: Interleukin-12 (IL-12) has potential as an immunotherapeutic agent for the treatment of cancer but is unfortunately associated with toxicity. Delivery of a plasmid encoding IL-12 with electroporation induces an antitumor effect in the B16 mouse melanoma model without serious side effects. To translate this observation to the clinic, an evaluation of toxicity was done in the mouse model.
EXPERIMENTAL DESIGN: Weight change, tumor response, blood chemistry and hematology values, and serum IL-12 levels were evaluated. Multiple tissues were analyzed histopathologically.
RESULTS: A pronounced reduction in tumor volume, including a large percentage of complete regressions, was observed after electrically mediated …
The Role Of Trailerhitch In Mouse Germ Cell Development, Ashley L. O'Hara
The Role Of Trailerhitch In Mouse Germ Cell Development, Ashley L. O'Hara
Honors Capstone Projects - All
During oogenesis in the Drosophila ovary, a 16-cell cyst develops in which one cell grows to become the oocyte. The surrounding nurse cells transport mRNAs, proteins, and organelles to the oocyte during development and must be localized properly within the oocyte. A complex of proteins is responsible for mRNA localization, including the recently discovered protein Trailerhitch. Homologs of Trailerhitch exist in other species including C. elegans, yeast, mice, and humans, but the function is unknown. We are interested in studying the function of Trailerhitch in mouse germ cell development. Mice with a nonfunctional Trailerhitch gene were synthesized using a gene …
Total Synthesis Of Pumiliotoxin 341a, Lydia Choi
Total Synthesis Of Pumiliotoxin 341a, Lydia Choi
Honors Capstone Projects - All
Pumiliotoxin 341 A differs from all other pumiliotoxins in that its alkylidene side chain has been cyclized to form a pyranose ring, providing another quaternary center in its indolizidine ring. Although the gross structure of this natural product has been determined, the absolute and relative stereochemistry of the tertiary alcohol on C14 is still unknown. As a result, we want to synthesize this alkaloid to prove its stereochemistry and to prepare material for further biological analysis. A rhodium-catalyzed alkyne addition reaction currently being developed in our group is employed as the key reaction in our synthesis of the indolizidine core. …
The Response Of A Biocompatible Liquid Crystal To Ions And Chemistry On Nanostructured Surfaces, Anny Huang
The Response Of A Biocompatible Liquid Crystal To Ions And Chemistry On Nanostructured Surfaces, Anny Huang
Honors Capstone Projects - All
Traditional lyotropic liquid crystals are composed of amphiphilic molecules forming assemblies in water. Disodium cromoglycate (cromolyn or DSCG) – an antiasthmatic drug – is a novel and unusual lyotropic liquid crystal because it is not amphiphilic, and yet, it exhibits large birefringence (shininess) when dissolved in water forming lyotropic liquid crystal. In the work, DSCG liquid crystal is doped with different types of salt such as sodium chloride and sodium perchlorate, and the response in the changes of birefringence and liquid crystal transition temperature is studied. We find that addition of certain type of salts enhance the propensity of formation …
Activation In Neural Networks Controlling Ingestive Behaviors: What Does It Mean, And How Do We Map And Measure It?, Alan G. Watts, Arshad M. Khan, Graciela Sanchez-Watts, Dawna Salter, Christina M. Neuner
Activation In Neural Networks Controlling Ingestive Behaviors: What Does It Mean, And How Do We Map And Measure It?, Alan G. Watts, Arshad M. Khan, Graciela Sanchez-Watts, Dawna Salter, Christina M. Neuner
Arshad M. Khan, Ph.D.
No abstract provided.
Biochemical Characterization Of The Major Sorghum Grain Peroxidase, Mamoudou H. Dicko, Harry Gruppen, Riet Hilhorst, Alphons G. J. Voragen, Willen W. H. Van Berkel
Biochemical Characterization Of The Major Sorghum Grain Peroxidase, Mamoudou H. Dicko, Harry Gruppen, Riet Hilhorst, Alphons G. J. Voragen, Willen W. H. Van Berkel
Pr. Mamoudou H. DICKO, PhD
Mid-Ir Biosensor: Detection And Fingerprinting Of Pathogens On Gold Island Functionalized Chalcogenide Films, Chenxu Yu, Ashtosh Ganjoo, H. Jain, C. G. Pantano, Joseph Irudayaraj
Mid-Ir Biosensor: Detection And Fingerprinting Of Pathogens On Gold Island Functionalized Chalcogenide Films, Chenxu Yu, Ashtosh Ganjoo, H. Jain, C. G. Pantano, Joseph Irudayaraj
Chenxu Yu
Antibody (human IgG, anti-E. coli O157:H7, and anti-Salmonella) complexes on the surface of IR-transparent Ge-containing chalcogenide glass films were formed via thiol chemistry on 20-nm-thick gold islands. As a first step, the protocol was validated by monitoring fluorescently tagged targets to validate binding. FT-IR spectroscopy confirmed that the coating of the films with 20-nm gold did not have a significant effect on the propagation and penetration of IR evanescent waves through the film. The films functionalized with anti-E. coli O157:H7 and anti-Salmonella antibodies were used to detect E. coli O157:H7 and S. enteriditis through label-free IR fingerprinting. Highly selective detection …
Erratum: "Hard Sphere Radial Distribution Function Again", Andrij Trokhymchuk, Douglas Henderson, Ivo Nezbeda, Jan Jirsak
Erratum: "Hard Sphere Radial Distribution Function Again", Andrij Trokhymchuk, Douglas Henderson, Ivo Nezbeda, Jan Jirsak
Faculty Publications
Some misprints have been found for parameters given by Eqs. 29 and 30 and the relevant equations in the Appendix.
Two New Resorcinarenes: A Pyridine & Acetic Acid Ligand For Metal Coordination And A Deep-Cavity Nitroquinoxaline Resorcinarene, Samantha Sizemore Vernetti
Two New Resorcinarenes: A Pyridine & Acetic Acid Ligand For Metal Coordination And A Deep-Cavity Nitroquinoxaline Resorcinarene, Samantha Sizemore Vernetti
Theses and Dissertations
Functionalizing the upper rim of resorcinarene-based cavitands allows a variety of compounds to be synthesized from a single scaffold. Using the upper-rim moieties as ligands for a variety of transition metal ions further increases the versatility of this class of host compounds. A new resorcinarene-based molecule functionalized with four pyridine and acetic acid ligands has been successfully prepared to explore the properties of metal-assembled complexes. To synthesize this compound, tetra(bromomethyl)cavitand was reacted with N-(2-pyridylmethyl)-N-ethylacetate amine to give ethyl acetate pyridine resorcinarene. Hydrolysis of the ester gave acetic acid pyridine resorcinarene (APRes) in good yield. Complexes with Cu2+, Co2+, and Zn2+ …
Development Of A High Spatial Selectivity Tri-Polar Concentric Ring Electrode For Laplacian Electroencephalography (Leeg) System, Kanthaiah Koka
Development Of A High Spatial Selectivity Tri-Polar Concentric Ring Electrode For Laplacian Electroencephalography (Leeg) System, Kanthaiah Koka
Doctoral Dissertations
Brain activity generates electrical potentials that are spatio-temporal in nature. Electroencephalography (EEG) is the least costly and most widely used non-invasive technique for diagnosing many brain problems. It has high temporal resolution but lacks high spatial resolution.
The surface Laplacian will enhance the spatial resolution of EEG as it performs the second spatial derivative of the surface potentials. In an attempt to increase the spatial selectivity, researchers introduced a bipolar electrode configuration using a five point finite difference method (FPM) and others applied a quasi-bipolar (tri-polar with two elements shorted) concentric electrode configuration. To further increase the spatial resolution, the …
The Study Of Nitric Oxide Synthase Expression, Function, And Regulation In The Renal Vasculature During Postnatal Renal Development, Brian Blake Ratliff
The Study Of Nitric Oxide Synthase Expression, Function, And Regulation In The Renal Vasculature During Postnatal Renal Development, Brian Blake Ratliff
Theses and Dissertations in Biomedical Sciences
The newborn kidney is vulnerable to vasomotor acute renal failure (ARF) from adverse perinatal events or complications of prematurity. Nitric oxide (NO) vasodilation is vitally protective in this type of ARF, but its relationship with other vasoactive factors, such as angiotensin II (AII) has not been examined. In the immature kidney, nitric oxide synthase (NOS) isoforms, specifically eNOS and nNOS, are developmentally regulated, but their specific role and regulation are unknown.
The enhanced vasodilatory role of NO in the immature kidney was hypothesized to be attributed to regulatory, expressional, and functional differences in eNOS and nNOS isoforms from the adult. …
Modulation Of Tgfβ-Induced Pai -1 Expression By Changes In Actin Polymerization In Human Mesangial Cells, Keyur Patel
Modulation Of Tgfβ-Induced Pai -1 Expression By Changes In Actin Polymerization In Human Mesangial Cells, Keyur Patel
Theses and Dissertations in Biomedical Sciences
Chronic renal diseases show increased deposition of extracellular matrix (ECM) in the glomerulus (glomerulosclerosis). Glomerulosclerosis is associated with activation of normally quiescent glomerular mesangial cells into myofibroblast-like cells. The overall objective of this study is to delineate cellular mechanism/s of myofibroblast-differentiation in disease states. In cultured mesangial cells certain characteristics of myofibroblast differentiation (α-smooth muscle actin (α-SMA) and hypertrophy) are associated with an increase in polymeric actin microfilaments (stress fibers). It is likely that other genes are also regulated in an actin cytoskeleton-dependent manner during myofibroblast differentiation. In these studies, we therefore examined the hypothesis that changes in the actin …
Nanosecond Pulsed Electric Field Effects On Cell Cycle And Apoptosis, Emily H. Hall
Nanosecond Pulsed Electric Field Effects On Cell Cycle And Apoptosis, Emily H. Hall
Theses and Dissertations in Biomedical Sciences
Apoptosis, programmed cell death, is a highly regulated and complex pathway essential for embryonic development, immune-system function and maintenance of tissue homeostasis where cells induce their own cell death. Cells undergoing apoptosis exhibit a distinctive phenotype characterized by maintenance of membrane integrity, cell shrinkage, phosphatidylserine (PS) externalization at the plasma membrane, caspase protease activation, DNA fragmentation, release of cytochrome c from the mitochondrion, and membrane blebbing. An important regulatory protein in the apoptotic pathway is p53. The p53 protein functions to modulate the cell cycle by arresting cells in the G1 and G 2 phases to repair DNA damage, and/or …
Biochemical Profiling Of Gout Patients, Tamera Fayre Schlitt
Biochemical Profiling Of Gout Patients, Tamera Fayre Schlitt
Chemistry & Biochemistry Theses & Dissertations
The purpose of the research is to investigate the biochemical cause of gout in 82 patients. The gouty patients had been diagnosed with gout according to the criterion of the American Rheumatism Association. This gout patient population consisted of 58 men and 24 women with gout whose ages ranged from 11 to 84 years of age with a mean age of 44 years. Key purine metabolism enzyme activity levels and purine metabolite concentrations in the patients' plasma and urine were compared to the mean values of a healthy control group. The control group consisted of 33 males and 25 female …
Alternative First Exon Splicing Regulates Subcellular Distribution Of Methionine Sulfoxide Reductases, Hwa-Young Kim, Vadim Gladyshev
Alternative First Exon Splicing Regulates Subcellular Distribution Of Methionine Sulfoxide Reductases, Hwa-Young Kim, Vadim Gladyshev
Vadim Gladyshev Publications
Background: Methionine sulfoxide reduction is an important protein repair pathway that protects against oxidative stress, controls protein function and has a role in regulation of aging. There are two enzymes that reduce stereospecifically oxidized methionine residues: MsrA (methionine-Ssulfoxide reductase) and MsrB (methionine-R-sulfoxide reductase). In many organisms, these enzymes are targeted to various cellular compartments. In mammals, a single MsrA gene is known, however, its product is present in cytosol, nucleus, and mitochondria. In contrast, three mammalian MsrB genes have been identified whose products are located in different cellular compartments. Results: In the present study, we identified and characterized alternatively spliced …
Aspartyl-Trna Synthetase Is The Target Of Peptidenucleotide Antibiotic Microcin C, Anastasia Metlitskaya, Teymur Kazakov, Aigar Kommer, Olga Pavlova, Mette Praetorius-Ibba, Michael Ibba, Igor Krasheninnkov, Vyacheslav Kolb, Inessa Khmel, Konstantin Severinov
Aspartyl-Trna Synthetase Is The Target Of Peptidenucleotide Antibiotic Microcin C, Anastasia Metlitskaya, Teymur Kazakov, Aigar Kommer, Olga Pavlova, Mette Praetorius-Ibba, Michael Ibba, Igor Krasheninnkov, Vyacheslav Kolb, Inessa Khmel, Konstantin Severinov
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Microcin C is a ribosome-synthesized heptapeptide that contains a modified adenosine monophosphate covalently attached to the C-terminal aspartate. Microcin C is a potent inhibitor of bacterial cell growth. Based on the in vivo kinetics of inhibition of macromolecular synthesis, Microcin C targets translation, through a mechanism that remained undefined. Here, we show that Microcin C is a subject of specific degradation inside the sensitive cell. The product of degradation, a modified aspartyl-adenylate containing an N-acylphosphoramidate linkage, strongly inhibits translation by blocking the function of aspartyl-tRNA synthetase.
Gas Chromatography: Mass Spectrometry Of Chemical Agents And Related Interferents, Lailiang Zhai
Gas Chromatography: Mass Spectrometry Of Chemical Agents And Related Interferents, Lailiang Zhai
Theses and Dissertations
One of the main problems encountered in chemical analysis operations in the field is collecting sufficient sample from the source and transferring that sample to the measurement instrument for fast separation and identification. I have been involved in developing a field-portable gas chromatography-mass spectrometry (GC-MS) system with solid phase microextraction (SPME) sampling for point detection of chemical agents. The objective is to minimize the analysis time between sampling and detection of a potential chemical threat. SPME offers a convenient means for sampling gaseous and liquid samples, concentrating the analytes, and transferring the analytes to the injection port of a GC …
Development Of An Unbiased Statistical Method For The Analysis Of Unigenic Evolution, Colleen D. Behrsin, Chris J. Brandl, David W. Litchfield, Brian H. Shilton, Lindi M. Wahl
Development Of An Unbiased Statistical Method For The Analysis Of Unigenic Evolution, Colleen D. Behrsin, Chris J. Brandl, David W. Litchfield, Brian H. Shilton, Lindi M. Wahl
Biochemistry Publications
Background: Unigenic evolution is a powerful genetic strategy involving random mutagenesis of a single gene product to delineate functionally important domains of a protein. This method involves selection of variants of the protein which retain function, followed by statistical analysis comparing expected and observed mutation frequencies of each residue. Resultant mutability indices for each residue are averaged across a specified window of codons to identify hypomutable regions of the protein. As originally described, the effect of changes to the length of this averaging window was not fully eludicated. In addition, it was unclear when sufficient functional variants had been examined …
Membrane-Based Protein Preconcentration Microfluidic Devices, Yi Li
Membrane-Based Protein Preconcentration Microfluidic Devices, Yi Li
Theses and Dissertations
Interest in microchip capillary electrophoresis (CE) is growing due to the rapid analysis times provided and small sample input requirements. However, higher-concentration samples are typically needed because of the small (~pL) detection volumes in these devices. I have made membrane-based protein preconcentration systems in capillary and microchip designs to increase the detectability of low-concentration biological samples. A photopolymerized ion-permeable membrane interfaced with a microchannel in poly(methyl methacrylate) (PMMA) formed the preconcentrator. When a voltage was applied between the sample reservoir and the ionically conductive membrane in a capillary-based system, R-phycoerythrin was concentrated more than 1,000 fold, as determined by laser-induced …
Identification And Characterization Of Fep15, A New Selenocysteine-Containing Member Of The Sep15 Protein Family, Sergey V. Novoselov, Deame Hua, A. V. Lobanov, Vadim N. Gladyshev
Identification And Characterization Of Fep15, A New Selenocysteine-Containing Member Of The Sep15 Protein Family, Sergey V. Novoselov, Deame Hua, A. V. Lobanov, Vadim N. Gladyshev
Vadim Gladyshev Publications
Sec (selenocysteine) is a rare amino acid in proteins. It is co-translationally inserted into proteins at UGA codons with the help of SECIS (Sec insertion sequence) elements. A full set of selenoproteins within a genome, known as the selenoproteome, is highly variable in different organisms. However, most of the known eukaryotic selenoproteins are represented in the mammalian selenoproteome. In addition, many of these selenoproteins have cysteine orthologues. Here, we describe a new selenoprotein, designated Fep15, which is distantly related to members of the 15 kDa selenoprotein (Sep15) family. Fep15 is absent in mammals, can be detected only in fi sh …
Three-Dimensional Structure Of The Bacterial Cell Wall Peptidoglycan, Samy O. Meroueh, Krisztina Z. Bencze, Dusan Hesek, Mijoon Lee, Timothy L. Stemmler, Shahriar Mobashery
Three-Dimensional Structure Of The Bacterial Cell Wall Peptidoglycan, Samy O. Meroueh, Krisztina Z. Bencze, Dusan Hesek, Mijoon Lee, Timothy L. Stemmler, Shahriar Mobashery
Biochemistry and Molecular Biology Faculty Publications
The 3D structure of the bacterial peptidoglycan, the major constit- uent of the cell wall, is one of the most important, yet still unsolved, structural problems in biochemistry. The peptidoglycan comprises alternating N-acetylglucosamine (NAG) and N-acetylmu- ramic disaccharide (NAM) saccharides, the latter of which has a peptide stem. Adjacent peptide stems are cross-linked by the transpeptidase enzymes of cell wall biosynthesis to provide the cell wall polymer with the structural integrity required by the bacte- rium. The cell wall and its biosynthetic enzymes are targets of antibiotics. The 3D structure of the cell wall has been elusive because of its …
Shrinkage Estimation For Sage Data Using A Mixture Dirichlet Prior, Jeffrey S. Morris, Keith A. Baggerly, Kevin R. Coombes
Shrinkage Estimation For Sage Data Using A Mixture Dirichlet Prior, Jeffrey S. Morris, Keith A. Baggerly, Kevin R. Coombes
Jeffrey S. Morris
Serial Analysis of Gene Expression (SAGE) is a technique for estimating the gene expression profile of a biological sample. Any efficient inference in SAGE must be based upon efficient estimates of these gene expression profiles, which consist of the estimated relative abundances for each mRNA species present in the sample. The data from SAGE experiments are counts for each observed mRNA species, and can be modeled using a multinomial distribution with two characteristics: skewness in the distribution of relative abundances and small sample size relative to the dimension. As a result of these characteristics, a given SAGE sample will fail …
An Introduction To High-Throughput Bioinformatics Data, Keith A. Baggerly, Kevin R. Coombes, Jeffrey S. Morris
An Introduction To High-Throughput Bioinformatics Data, Keith A. Baggerly, Kevin R. Coombes, Jeffrey S. Morris
Jeffrey S. Morris
High throughput biological assays supply thousands of measurements per sample, and the sheer amount of related data increases the need for better models to enhance inference. Such models, however, are more effective if they take into account the idiosyncracies associated with the specific methods of measurement: where the numbers come from. We illustrate this point by describing three different measurement platforms: microarrays, serial analysis of gene expression (SAGE), and proteomic mass spectrometry.
Bayesian Mixture Models For Gene Expression And Protein Profiles, Michele Guindani, Kim-Anh Do, Peter Mueller, Jeffrey S. Morris
Bayesian Mixture Models For Gene Expression And Protein Profiles, Michele Guindani, Kim-Anh Do, Peter Mueller, Jeffrey S. Morris
Jeffrey S. Morris
We review the use of semi-parametric mixture models for Bayesian inference in high throughput genomic data. We discuss three specific approaches for microarray data, for protein mass spectrometry experiments, and for SAGE data. For the microarray data and the protein mass spectrometry we assume group comparison experiments, i.e., experiments that seek to identify genes and proteins that are differentially expressed across two biologic conditions of interest. For the SAGE data example we consider inference for a single biologic sample.
Analysis Of Mass Spectrometry Data Using Bayesian Wavelet-Based Functional Mixed Models, Jeffrey S. Morris, Philip J. Brown, Keith A. Baggerly, Kevin R. Coombes
Analysis Of Mass Spectrometry Data Using Bayesian Wavelet-Based Functional Mixed Models, Jeffrey S. Morris, Philip J. Brown, Keith A. Baggerly, Kevin R. Coombes
Jeffrey S. Morris
In this chapter, we demonstrate how to analyze MALDI-TOF/SELDITOF mass spectrometry data using the wavelet-based functional mixed model introduced by Morris and Carroll (2006), which generalizes the linear mixed models to the case of functional data. This approach models each spectrum as a function, and is very general, accommodating a broad class of experimental designs and allowing one to model nonparametric functional effects for various factors, which can be conditions of interest (e.g. cancer/normal) or experimental factors (blocking factors). Inference on these functional effects allows us to identify protein peaks related to various outcomes of interest, including dichotomous outcomes, categorical …
Hydrographic Observations During The 2002 Ioc Contaminant Baseline Survey In The Western Pacific Ocean, C. I. Measures, Greg A. Cutter, W. M. Landing, R. T. Powell
Hydrographic Observations During The 2002 Ioc Contaminant Baseline Survey In The Western Pacific Ocean, C. I. Measures, Greg A. Cutter, W. M. Landing, R. T. Powell
OES Faculty Publications
The 2002 IOC Contaminant Baseline Survey in the western Pacific Ocean was the fourth in a series of cruises intended to establish the contemporary concentrations of trace elements and other materials in the major water masses of the ocean and to illuminate the pathways by which materials delivered to the surface ocean are incorporated in the subsurface waters. The expedition occupied 9 vertical profile stations encompassing the subtropical and subarctic gyre of the western North Pacific. In addition, underway surface water samples were collected during transits between the stations. This paper uses the temperature, salinity, nutrient, oxygen, and chlorophyll data …
The Importance Of Maltose In Transitory Starch Breakdown, Yan Lu, Thomas Sharkey
The Importance Of Maltose In Transitory Starch Breakdown, Yan Lu, Thomas Sharkey
Yan Lu
No abstract provided.
Measurement, Characterization, And Source Apportionment Of The Major Chemical Components Of Fine Particulate Material, Including Semi-Volatile Species, Brett D. Grover
Measurement, Characterization, And Source Apportionment Of The Major Chemical Components Of Fine Particulate Material, Including Semi-Volatile Species, Brett D. Grover
Theses and Dissertations
The promulgation of revised standards for atmospheric fine particles (PM2.5) by the US EPA has sparked renewed interest in the ability to accurately measure and characterize suspended atmospheric particulate matter. Semi-volatile material (SVM), consisting of ammonium nitrate and semi-volatile organic material (SVOM), is not accurately measured by EPA accepted methods such as the Federal reference method (FRM) or Tapered Element Oscillating Microbalance (TEOM). However, SVM is often a major fraction of urban aerosols. Recent advances in atmospheric sampling instrumentation allowed for the semi-continuous characterization of urban PM2.5, including SVM. The Filter Dynamic Measurement System (FDMS) was shown to measure total …