1,017 research outputs found
Sequential Derivatization of Polar Organic Compounds in Cloud Water Using O-(2,3,4,5,6-Pentafluorobenzyl)hydroxylamine Hydrochloride, N, O-Bis(trimethylsilyl)trifluoroacetamide, and Gas-Chromatography/Mass Spectrometry Analysis
No full textCloud water samples from Whiteface Mountain, NY were used to develop a combined sampling and gas chromatography-mass spectrometric (GCMS) protocol for evaluating the complex mixture of highly polar organic compounds (HPOC) present in this atmospheric medium. Specific HPOC of interest were mono- and di keto-acids which are thought to originate from photochemical reactions of volatile unsaturated hydrocarbons from biogenic and manmade emissions and be a major fraction of atmospheric carbon. To measure HPOC mixtures and the individual keto-acids in cloud water, samples first must be derivatized for clean elution and measurement, and second, have low overall background of the target species as validated by GCMS analysis of field and laboratory blanks. Here, we discuss a dual derivatization method with PFBHA and BSTFA which targets only organic compounds that contain functional groups reacting with both reagents. The method also reduced potential contamination by minimizing the amount of sample processing from the field through the GCMS analysis steps. Once derivatized only gas chromatographic separation and selected ion monitoring (SIM) are needed to identify and quantify the polar organic compounds of interest. Concentrations of the detected total keto-acids in individual cloud water samples ranged from 27.8 to 329.3 ng mL-1 (ppb). Method detection limits for the individual HPOC ranged from 0.17 to 4.99 ng mL-1 and the quantification limits for the compounds ranged from 0.57 to 16.64 ng mL-1. The keto-acids were compared to the total organic carbon (TOC) results for the cloud water samples with concentrations of 0.607 to 3.350 mg L-1 (ppm). GCMS analysis of all samples and blanks indicated good control of the entire collection and analysis steps. Selected ion monitoring by GCMS of target keto-acids was essential for screening the complex organic carbon mixtures present at low ppb levels in cloud water. It was critical for ensuring high levels of quality assurance and quality control and for the correct identification and quantification of key marker compounds.Corrected proof of accepted manuscrip
Gas phase hydration of methyl glyoxal to form the gemdiol
No full textMethylglyoxal is a known oxidation product of volatile organic compounds (VOCs) in Earth’s atmosphere. While the gas phase chemistry of methylglyoxal is fairly well understood, its modeled concentration and role in the formation of secondary organic aerosol (SOA) continues to be controversial. The gas phase hydration of methylglyoxal to form a gemdiol has not been widely considered for water-restricted environments such as the atmosphere. However, this process may have important consequences for the atmospheric processing of VOCs. We will report on spectroscopic work done in the Vaida laboratory studying the hydration of methylglyoxal and discuss the implications for understanding the atmospheric processing and fate of methylglyoxal and similar molecules
Gas phase hydration of methyl glyoxal to form the gemdiol
Get PDFMethylglyoxal is a known oxidation product of volatile organic compounds (VOCs) in Earth’s atmosphere. While the gas phase chemistry of methylglyoxal is fairly well understood, its modeled concentration and role in the formation of secondary organic aerosol (SOA) continues to be controversial. The gas phase hydration of methylglyoxal to form a gemdiol has not been widely considered for water-restricted environments such as the atmosphere. However, this process may have important consequences for the atmospheric processing of VOCs. We will report on spectroscopic work done in the Vaida laboratory studying the hydration of methylglyoxal and discuss the implications for understanding the atmospheric processing and fate of methylglyoxal and similar molecules.Made available in DSpace on 2017-01-26T21:39:35Z (GMT). No. of bitstreams: 4
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Previous issue date: 2016-06-2
Spawning ground surveys 2006-2007
Get PDFMatthew W. Hutchinson, Jessica L. Vogt and Alex Neerman.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 14-15).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Ultraviolet study of the gas phase hydration of methylglyoxal to form the gemdiol
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Previous issue date: 6Methylglyoxal is a known oxidation product of volatile organic compounds (VOCs) in Earth’s atmosphere. While the gas phase chemistry of methylglyoxal is fairly well understood, its modeled concentration and role in the formation of secondary organic aerosol (SOA) continues to be controversial. The gas phase hydration of methylglyoxal to form a gemdiol has been shown to occur in infrared studies but has not been widely considered for water-restricted environments such as the atmosphere. However, this process may have important consequences for the atmospheric processing or VOCs. We have recorded UV spectroscopic measurements following the hydration of methylglyoxal and have compared these measurements to calculated spectra of the electronic transitions of methylglyoxal and methylglyoxal diol. We will report on these measurements and discuss the implications for understanding the atmospheric processing and fate of methylglyoxal and similar molecule
Moravia E L\u27esperienza Autobiografica : Una Chiave Essenzial Per Decodificare I Soui Romanzi
No full textABSTRACT
MORAVIA E L\u27ESPERIENZA AUTOBIOGRAFICA : UNA CHIAVE ESSENZIALE PER DECODIFICARE I SOUI ROMANZI
By
JESSICA TOBY
May 2010
Advisor: Dr. Elena Past
Major: Italian
Degree: Master of Arts
This thesis takes a critical look at the physical and psychological experiences of Alberto Moravia as an adolescent and the integral role that they play in the development of his main literary characters. The key problem areas reside in decoding primary texts of the author alluding to psychological trauma in his childhood and analyzing the main protagonists of specific novels to reveal similarities between them and Moravia himself. The methods used in writing this thesis included examining primary texts, biographies, and theoretical works from a psycho-analytical perspective. In conclusion to this work, I have demonstrated that it is the responsibility of the critical reader to investigate an author\u27s autobiography in order to reveal hidden meaning in the text and unmask the true identity of his main protagonists
Nine years of video landers at the Oregon Department of Fish & Wildlife's Marine Resources Program
No full textLeif K. Rasmuson, Kelly A. Lawrence, Gregory K. Krutzikowsky, Jessica L. Watson, Lindsay Aylesworth, Robert W. Hannah, Brett T. Rodomsky, Brittany Huntington, Keith Matteson, Ryan R. Easton.Title from PDF title page (viewed on April 1, 2022).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 40-46).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
"""Jazzy Belle Retell/tale"": toward a framework of sonic black girlhood"
Get PDFThis thesis is an exploration of the creation and performance of the song “Jazzy Belle Retell/tale” created by Jessica Robinson, a member of the black girl band, We Levitate. This thesis explores the making of the retell/tale of a popular song by the hip hop group, OutKast as a practice of black girlhood music making. Moreover, this thesis will investigate the use of this music making as a tool for decolonizing research on and about Black girls’ lived experiences and their artistic visions. Ultimately, I seek to develop a language for a framework I am naming, sonic black girlhood to conceptualize the sounded artful lives of Black girlhood experience.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2017-12-01The student, Jessica Robinson, accepted the attached license on 2015-09-29 at 15:31.The student, Jessica Robinson, submitted this Thesis for approval on 2015-09-29 at 15:38.This Thesis was approved for publication on 2015-10-26 at 08:53.DSpace SAF Submission Ingestion Package generated from Vireo submission #8701 on 2016-03-02 at 14:12:14Made available in DSpace on 2016-03-02T20:57:25Z (GMT). No. of bitstreams: 2
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Isolation independent methods of characterizing phage communities 1: Strain typing using fingerprinting methods
No full textThe book chapter, "Isolation independent methods of characterizing phage communities 1: Strain typing using fingerprinting methods" was written by authors: Jessica L. Clasen (Douglas College Faculty) and is located in the book "Bacteriophages. Methods and Protocols (which is volume 2 of the Molecular and Applied Aspects book series). Since most of the phage genomes isolated from natural samples are previously unknown sequences, an isolation-independent approach is necessary to quantify the diversity of natural viral communities. Currently, two different methodological approaches are widely used to obtain genetic fingerprints of natural phage communities. While the separation of different viral genomes with pulsed field gel electrophoresis (PFGE) is based on the size of the genome, denaturing gradient gel electrophoresis (DGGE) uses minor differences in gene base composition to separate fragments of amplified DNA from natural viral communities. Finger printing techniques are a relatively fast and cheap tool to assess the diversity of environmental viruses. Together, PFGE and DGGE provide useful tools to study viral ecology in natural habitats.book chapterpublished.VirusesPFGEDGGEgenetic fingerprintsphage community compositionvirioplanktonbacteriophage
Preparing ocean governance for species on the move: Policy must anticipate conflict over geographic shifts
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