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769 full-text articles. Page 1 of 24.

Ryan Caylor, Ryan Caylor 2016 Concordia University - Portland

Ryan Caylor, Ryan Caylor

Matthew E. Wise

Ryan is a senior majoring in chemistry at Concordia University. He plans on graduating in the spring of 2017. After graduation Ryan plans on attending graduate school in the field of meteorology with an interest in becoming a weather man. Ryan is returning to the Pacific Northwest National Laboratory in the summer of 2015 to study the chemical composition of secondary organic aerosol particles. He is also a pitcher on the Concordia University baseball team.


Sustainability: Energy & Global Chemistry, Kurt W. Kolasinski 2016 West Chester University of Pennsylvania

Sustainability: Energy & Global Chemistry, Kurt W. Kolasinski

Kurt W. Kolasinski

No abstract provided.


Making Bread From Air: The World's Most Important Chemical Synthesis, Kurt W. Kolasinski 2016 West Chester University of Pennsylvania

Making Bread From Air: The World's Most Important Chemical Synthesis, Kurt W. Kolasinski

Kurt W. Kolasinski

No abstract provided.


Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. McMurry, James N. Smith, Jeffery R. Pierce 2016 Colorado State University - Fort Collins

Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. Mcmurry, James N. Smith, Jeffery R. Pierce

Civil and Environmental Engineering Faculty Publications and Presentations

New-particle formation (NPF) is a significant source of aerosol particles into the atmosphere. However, these particles are initially too small to have climatic importance and must grow, primarily through net uptake of low volatility species, from diameters ∼ 1 to 30–100 nm in order to potentially impact climate. There are currently uncertainties in the physical and chemical processes associated with the growth of these freshly formed particles that lead to uncertainties in aerosol-climate modeling. Four main pathways for new-particle growth have been identified: condensation of sulfuric-acid vapor (and associated bases when available), condensation of organic vapors, uptake of organic acids ...


Aqueous Photochemistry Of Glyoxylic Acid, Alexis J. Eugene, Sha-Sha Xia, Marcelo I. Guzman 2016 University of Kentucky

Aqueous Photochemistry Of Glyoxylic Acid, Alexis J. Eugene, Sha-Sha Xia, Marcelo I. Guzman

Chemistry Faculty Publications

Aerosols affect climate change, the energy balance of the atmosphere, and public health due to their variable chemical composition, size, and shape. While the formation of secondary organic aerosols (SOA) from gas phase precursors is relatively well understood, studying aqueous chemical reactions contributing to the total SOA budget is the current focus of major attention. Field measurements have revealed that mono-, di-, and oxo-carboxylic acids are abundant species present in SOA and atmospheric waters. This work explores the fate of one of these 2-oxocarboxylic acids, glyoxylic acid, which can photogenerate reactive species under solar irradiation. Additionally, the dark thermal aging ...


Carbon Nanotubes Affect The Toxicity Of Cuo Nanoparticles To Denitrification In Marine Sediments By Altering Cellular Internalization Of Nanoparticle, Xiong Zheng, Yinglong Su, Yinguang Chen, Rui Wan, Mu Li, Haining Huang, Xu Li 2016 Tongji University, Shanghai, China

Carbon Nanotubes Affect The Toxicity Of Cuo Nanoparticles To Denitrification In Marine Sediments By Altering Cellular Internalization Of Nanoparticle, Xiong Zheng, Yinglong Su, Yinguang Chen, Rui Wan, Mu Li, Haining Huang, Xu Li

Civil Engineering Faculty Publications

Denitrification is an important pathway for nitrate transformation in marine sediments, and this process has been observed to be negatively affected by engineered nanomaterials. However, previous studies only focused on the potential effect of a certain type of nanomaterial on microbial denitrification. Here we show that the toxicity of CuO nanoparticles (NPs) to denitrification in marine sediments is highly affected by the presence of carbon nanotubes (CNTs). It was found that the removal efficiency of total NOX-N (NO3-N and NO2-N) in the presence of CuO NPs was only 62.3%, but it increased to ...


Immobilization Of Heteropolyacids In Silica Gel, Opeyemi Adetola 2016 East Tennessee State University

Immobilization Of Heteropolyacids In Silica Gel, Opeyemi Adetola

Electronic Theses and Dissertations

Silica gels containing incorporated heteropolyacids (HPAs) were synthesized in acidic media by co-condensation of tetraethoxysilane (TEOS) with phosphotungstic or phosphomolybdic acids using sol-gel technique. Effect of the synthesis conditions on their structure and morphology was studied. Yields of modified materials were some lower as compared to non-modified silica gels. All materials were mesoporous but contained micropores in their structures. Presence of bands of Keggin’s structures in FT-IR spectra along with absence of XRD patterns of crystalline HPAs confirmed their fine incorporation into silica network. Particle sizes of modified materials were 800-1100 nm excepting for W-containing sample obtained with trimethylstearylammonium ...


Novel Methods And Sensors For The Analysis Of Trace Chemicals With Potential Environmental Applications, Samuel Mason Rosolina 2016 University of Tennessee - Knoxville

Novel Methods And Sensors For The Analysis Of Trace Chemicals With Potential Environmental Applications, Samuel Mason Rosolina

Doctoral Dissertations

The work in this dissertation focuses on the detection and analysis of trace chemicals in biological and environmental samples. Methods for the electrochemical detection of heavy metals Cd(II) [cadmium] and Pb(II) [lead], and the catalytic metal Pd(II) [palladium] in pharmaceutical ingredients have been optimized without the necessity of sample pretreatment. The metals can be analyzed simultaneously as well as individually, and the study includes the first known instance of the use of anodic stripping voltammetry (ASV) to detect metals in dimethyl sulfoxide (DMSO) solutions. Another method, based on ASV, has been optimized and evaluated for the purpose ...


Effects Of Cigarette Butts On Coastal Waters: An Elemental Analysis Of Seawater From St. Simon’S Island, Katherine Adorati 2016 University of Tennessee at Chattanooga

Effects Of Cigarette Butts On Coastal Waters: An Elemental Analysis Of Seawater From St. Simon’S Island, Katherine Adorati

Honors Theses

Cigarette litter can have detrimental effects on the environment, specifically when taking into account that over 4.5 trillion cigarette butts are littered every year. Within seawater, trace elements present in cigarettes may leach into the ocean, having damaging effects on the marine ecosystem. The goal of this research was to investigate if elemental contaminants leached from cigarette litter are significant in samples of seawater collected near St. Simon’s Island at both high and low tides, surrounding a beach party during the Florida/Georgia football game which occurred on November 1, 2014. Samples were collected in the months prior ...


Catalytic Transfer Hydrogenation Of Nitroalkenes To Primary Amines, Brendan Phillips 2016 Ursinus College

Catalytic Transfer Hydrogenation Of Nitroalkenes To Primary Amines, Brendan Phillips

Chemistry Honors Papers

This work describes synthetic methodology development in organic chemistry. The goal of this work is to demonstrate new ways of making biologically-relevant molecules that are in line with the principles of green chemistry (chemical practices which seek to be, regarding human and environmental health, benign by design). To this end, a new method has been developed toward the introduction of primary amine functionalities into organic molecules from readily-available aldehydes, via reduction of nitroalkene intermediates. Traditional methods of reducing nitroalkenes to primary amines require harsh conditions, often produce stoichiometric amounts of metal salt waste, and present significant safety challenges to the ...


The Level Of Polyaromatic Hydrocarbon Contamination On The Kalamazoo River Shoreline Remains High Following The 2010 Enbridge Oil Spill, Wisam Al-Isawi 2016 Western Michigan University

The Level Of Polyaromatic Hydrocarbon Contamination On The Kalamazoo River Shoreline Remains High Following The 2010 Enbridge Oil Spill, Wisam Al-Isawi

Research and Creative Activities Poster Day

  • One of the nation’s worst inland oil spills occurred near Marshall in Michigan in 2010.
  • The recent Enbridge Line 6B rupture released over three million liters of diluted bitumen crude oil into the environment.
  • The spilled oil entered the Talmadge Creek and flowed into the Kalamazoo River, a Lake Michigan tributary.
  • Polycyclic Aromatic Hydrocarbons (PAHs) together with other pollutants were released into the environment.
  • PAHs represents significant threats to aquatic organisms due to their carcinogenic and mutagenic properties and their persistence in the environment.
  • Five years following the oil spill accident, the levels and identities of PAHs were investigated ...


Photocatalytic Reduction Of Fumarate To Succinate On Zns Mineral Surfaces, Ruixin Zhou, Marcelo I. Guzman 2016 University of Kentucky

Photocatalytic Reduction Of Fumarate To Succinate On Zns Mineral Surfaces, Ruixin Zhou, Marcelo I. Guzman

Chemistry Faculty Publications

The reductive tricarboxylic acid (rTCA) cycle is an important central biosynthetic pathway that fixes CO2 into carboxylic acids. Among the five reductive steps in the rTCA cycle, the two-electron reduction of fumarate to succinate proceeds nonenzymatically on the surface of photoexcited sphalerite (ZnS) colloids suspended in water. This model reaction is chosen to systematically study the surface photoprocess occurring on ZnS in the presence of [Na2S] (1–10 mM) hole scavenger at 15 °C. Experiments at variable pH (5–10) indicate that monodissociated fumaric acid is the primary electron acceptor forming the monoprotic form of succinic acid ...


A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, Scott Simmons, Albert Fratini, Vladimir Benin 2016 University of Dayton

A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, Scott Simmons, Albert Fratini, Vladimir Benin

Albert Fratini

The title compound, sodium bis­(6-carb­oxy-1-hy­droxy-3-oxo-1,3-dihydro-2,1-benzoxaborol-1-yl)oxidanium, Na+·C16H15B2O13-, was prepared in two steps from 2-bromo-p-xylene. Its crystal structure was determined at 140 K and has triclinic (P) symmetry. The compound presents a unique structural motif, including two units of the cyclic anhydride of boronoterephthalic acid, joined by a protonated, and thereby trivalent, oxonium center. Association in the crystal is realized by complementary hydrogen bonding of the carboxyl groups, as well as by coordination of the sodium cations to the oxygen centers on the five-membered rings.


Procesy Cieplne I Aparaty (Lab), Wojciech Budzianowski 2016 Wroclaw University of Technology

Procesy Cieplne I Aparaty (Lab), Wojciech Budzianowski

Wojciech Budzianowski

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Mario Molina And The Threat Of Cfcs To The Ozone Layer In The Stratosphere, Dan Y. Watanabe 2016 Parkland College

Mario Molina And The Threat Of Cfcs To The Ozone Layer In The Stratosphere, Dan Y. Watanabe

Natural Sciences Poster Sessions

This poster for the Natural Sciences Poster Session at Parkland College describes the accomplishments of Mario Molina, who shares the Nobel Prize in chemistry with Paul J. Crutzen and F. Sherwood Rowland for discovering the harmful effects of chlorofluorocarbon gases in the stratosphere to the overall atmosphere and how they contribute to ozone depletion.


Surface Water Geochemistry And Strontium Characteristics Of Colorado Creeks, Natalie P. Cristo 2016 geology

Surface Water Geochemistry And Strontium Characteristics Of Colorado Creeks, Natalie P. Cristo

Undergraduate Honors Theses

Strontium isotopic composition and major and minor trace element compositional data allows us to classify waters and identify sources of dissolved solutes to deduce history of surface waters. In this study, such data were used to investigate the compositions and sources of solute found in selected surface waters from the Colorado Front Range and vicinity. The major ion compositions of surface waters draining from the eastern slope of the central Front Range are similar. Bulk water composition of upper Boulder Creek, Left Hand Creek and Coal Creek are all classified as Ca-Mg-Cl type. Most of the solutes in these waters ...


Purification And Characterization Of Bromocresol Purple For Spectrophotometric Seawater Alkalinity Titrations, Taymee A. Brandon 2016 The University Of Montana

Purification And Characterization Of Bromocresol Purple For Spectrophotometric Seawater Alkalinity Titrations, Taymee A. Brandon

Undergraduate Theses and Professional Papers

The topic of my research is the purification of the sulfonephthalein indicator bromocresol purple (BCP). BCP is used as an acid-base indicator in seawater alkalinity determinations. Impurities in sulfonephthalein indicator salts often result in significant errors in pH values3. High-precision inorganic carbon (i.e. CO2) measurements are necessary to document the changes in ocean chemistry and pH due to anthropogenic CO2­ uptake by the earth’s oceans3. In order to reduce the error in seawater pH determinations and the general understanding of the CO2 cycle, BCP must be purified and characterized. Previous work has described ...


A Shift In Louisiana Salt Marsh Microbial Communities Reflecting Changes In Salinity And Biogeochemical Parameters, Haley Holladay 2016 University of Colorado, Boulder

A Shift In Louisiana Salt Marsh Microbial Communities Reflecting Changes In Salinity And Biogeochemical Parameters, Haley Holladay

Undergraduate Honors Theses

The relationship between microbial communities, salinity, soil depth, and time was evaluated using phospholipid fatty acids (PLFA) collected from coastal wetlands in Louisiana post hurricanes Katrina and Rita. The three marsh types studied included freshwater and intermediate marshes from the Jean Lafitte Preserve as well as two brackish marsh sites from the Caernarvon Basin. The Caernarvon Basin was heavily impacted from the hurricanes leaving the lower sites sampled remnant marsh. The goal of this study was to examine microbial community changes along a salinity gradient to further understand the impact of salinity on the wetland ecosystem. This was done using ...


Seasonal Evolution Of Active Layer Formation In Subarctic Peat Plateaux And Implications For Dissolved Organic Matter Composition And Transfer, Jennifer L. Hickman 2016 Wilfrid Laurier University

Seasonal Evolution Of Active Layer Formation In Subarctic Peat Plateaux And Implications For Dissolved Organic Matter Composition And Transfer, Jennifer L. Hickman

Theses and Dissertations (Comprehensive)

Peat-accumulating wetlands are ecosystems whose rate of photosynthetic production of organic matter is greater than that of its decomposition, resulting in a build up of soil organic matter that may take centuries to fully decompose. Carbon (C) stocks within these ecosystems are a function of inputs from photosynthesis, and losses from heterotrophic decomposition. Due to the short growing season and overall cold climate of boreal and tundra regions, C has been accumulating within these landscapes, mostly in soil organic matter, since the last glaciation. Climate change, predicted to result in rising temperatures and increased precipitation, has begun to degrade the ...


Sm And Dy Interaction With Dissolved Organic Matter (Dom) In Freshwater Measured By Ion-Selective Electrode And Fluorescence Quenching Analytical Techniques, Alexandra Carvajal 2016 Wilfrid Laurier University

Sm And Dy Interaction With Dissolved Organic Matter (Dom) In Freshwater Measured By Ion-Selective Electrode And Fluorescence Quenching Analytical Techniques, Alexandra Carvajal

Theses and Dissertations (Comprehensive)

With the increased demand for lanthanide metals in various industries, companies are looking into mining of these metals in Northern Canada. The release of these metals into the environment may have adverse effect on aquatic ecosystems; thus, it is important to understand potential toxicological effects of lanthanides on aquatic organisms. One way to predict these effects is by using a Biotic Ligand Model (BLM). Although incorporation of lanthanides into the model will require a substantial amount of future research, initial studies into speciation and toxicity can provide a useful basis for future reference. There are two main objectives to this ...


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