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Seed Phosphorus In Wheat And Lupins, Blakely Paynter, K. Adcock, R. W. Bell, Tim Pope

Experimental Summaries - Plant Research

Trial 90NO119

Seed P in wheat.

Location: Greenhills.

Design: 2 applied P x 3 seed P x 4 replicates, sowing wheat (cv. Aroona) seed from 89N33 at 70 kg/ha on May 15, 1990.

Trial 90NO120

Seed P in wheat.

Location: York

Design: 2 applied from P x 3 seed P x 4 replicates, 89N33 at 70 kg/ha on May 25, 1990.

Trial 90NO117

Seed P in lupins

Location: Greenhills.

Design: 2 applied P x 3 seed P x 4 replicates, sowing lupins (cv. Gungurru) from 85BA35 at 100 kg/ha on May 15, 1990.

Trial 90NO118

Seed P in lupins.

Location: …

Organic Geochemistry And Petrography Of Spanish Oil Shales, Michael A. Kruge, Isabel Suarez-Ruiz

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

Four of the principal oil shale units of Spain were examined by organic geochemical and petrographic methods. The samples included three lacustrine shales (Carboniferous from Puertollano, Cretaceous from Llames and Miocene from Rubielos de Mora) and one marine shale (Lower Jurassic from Punta del Cuerno ). The petrographic observations show a dominance of liptodetrinite associated with bitumen-stained mineral matter and alginite, as well as a paucity of structured terrestrial organic matter. Geochemical work shows that the soluble organic matter is a mixture of terrestrially derived and aquatic, with the lacustrine samples having the strongest land plant signatures. Low values of …

Development Of Procedures To Determine The Fertilizer Requirements Of Annual Pasture Legumes Grown In Cereal Cropping Systems., Blakely H. Paynter

Experimental Summaries - Plant Research

Trials 88ME67, 88SC17, 90ME1 and 90ME2

Location: Merredin

To determine the phosphate (P) fertilizer requirements of burr medic on marginally acidic, medium textured soils and yellow serradella on acidic, light textured soils.

Trials 89ME52, 89ME55 and 86ME61

Location: Merredin

Determine the response of yellow serradella and burr medic to residual phosphate and freshly applied phosphate.

Trials 89ME50, 89ME54, 88ME67, 88SC17, 89ME60

Location: Merredin.

To measure the influence of different levels of pasture productivity (generated by different levels of P supply) and the different pasture legumes on subsequent wheat crops.

Interaction Of Pyridine With Ba2casr2cu20x, Juana Acrivos, C. Lin

Faculty Publications, Chemistry

The adsorption of of pyridine on single crystals of Bi2CaSr2Cu2Ox has been followed by optical microscopy on the crystal surface, where a blue solution is formed as a first step of reaction. The superconducting properties of the single crystal and its structure were monitored by ac susceptibility and by x-ray diffraction measurements. The results (as observed by the growth of the blue solution boundary versus time with Daa = 3.7x10-10 cm2/s.) indicate that the reaction starts at nucleation sites on the basal surface of the crystal. The edges of the crystal also show blue nucleation sites but these do not …

Spatial And Temporal Distribution Of Hydrogen Peroxide In The Equatorial Pacific Ocean, Renee Blanchard

Honors Theses

The concentration of hydrogen peroxide in the Equatorial Pacific was determined fluorometrically using the horseradish peroxidase catalyzed dimerization of (p-hydroxyphenyl)acetic acid. Vertical profiles were obtained between 9 ON and 3 oS on a longitudinal transect along 140 oW during June and July of 1990 on the RN Wecoma. Peroxide concentrations ranged from 25-80 nmol/L at the surface and decreased to the detection limit of 1 nmol/L at a depth of about 200 meters. Diel variations of hydrogen peroxide in the surface waters were observed over the period of 8 days. The variation in surface concentration may be attributed to the …

Development Of Ruthenium Vinylbipyridine Modified Electrode Surfaces For Use In Chemiluminescence-Based Detection Systems, Matthew F. Piescinski

Masters Theses

Based upon the chemiluminescent properties of [Ru(bpy)₃]²⁺ and the proven analytical applications of that complex in the detection of easily reduced anions in solution, a chromatographic detection system was designed utilizing an immobilized form of the Ru(ll) complex. The objective was to create, by electropolymerization, a regenerative chemiluminescent surface on a working electrode. Reductive electropolymerization was accomplished by the use of a [Ru(bpy)₃]²⁺ analog containing the ligand vinylbipyridine. Two analogs, [Ru(vbpy)₃][PF₆]₂ and [Ru(phen)₂(vbpy)][PF₆]₂ were polymerized on platinum, glassy carbon and indium-doped tin oxide working …

Dehydrobromination Of Some 1,3-Dibromo-1,1- Difluoro Compounds Som (4+2) Cycloaddition Reactions Of 1,1-Difluoro-1,3-Dienes, Christopher Foti

Retrospective Theses and Dissertations

The title 1,3-dibromo- l, l-difluoro compounds are dehydrobrominated in the presence of l,8-diazabicyclo[5.4.0]undec-7-ene (DBU). Reaction of simple saturated dibromides with DBU at 25 °C affords moderate yields of monoelimination products in which the reaction is 100% stereoselective and regioselective. Highly conjugated dienes are synthesized at mild reaction conditions in contrast to simple alkyl or pentafluorophenyl dienes which are inaccessible via a double dehydrobromination reaction due to the unexpected formation of trifluoromethyl compounds. Aromatic gem-difluorodienes react with 4-phenyl-1,2,4-triazoline-3,5-dione and a mechanistic experiment demonstrates the relative reactivities of the isomers of 1, l-difluoro-4-phenyl-1,3-butadiene in a Diels-Alder reaction. The unfluorinated analogue of 1, …

Aspects Of Sporinite Chemistry, Michael A. Kruge, John C. Crelling, Edwin J. Hippo, Stephen R. Palmer

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

With the recent advent of the ability to separate coal into maceral concentrates of high purity, the individual constituents of coal can now be analyzed separately, without their mutual interference, giving a much better understanding of the macromolecular structure of coal. The sporinites from two Pennsylvanian age coal samples (Illinois Basin, U.S.A.) were studied, one from a vitrinite-rich high-volatile bituminous coal, the other from a liptinite-rich high-volatile bituminous coal of slightly higher rank. Sporinites were isolated from each coal by density gradient centrifugation. The sporinite of the vitrinite-rich coal was compared chemically and petrographically with the parent coal and with …

Drop-Box Technique For Quantitative Sampling Of Macrofauna And Aquatic Plants At Restored And Natural Wetlands, J. Douglas Oliver, Andrew J. Leslie, William M. Bartodziej

Faculty Publications and Presentations

No abstract provided.

Second Coefficient Of Viscosity In Air, Robert L. Ash, Allan J. Zuckerwar, Zhonquan Zheng

Mechanical & Aerospace Engineering Faculty Publications

Acoustic attenuation measurements in air were analyzed in order to estimate the second coefficient of viscosity. Data over a temperature range of 11 C to 50 C and at relative humidities between 6 percent and 91 percent were used. This analysis showed that the second coefficient of viscosity varied between 1900 and 20,000 times larger than the dynamic or first coefficient of viscosity over the temperature and humidity range of the data. In addition, the data showed that the molecular relaxation effects, which are responsible for the magnitude of the second coefficient of viscosity, place severe limits on the use …

Activator-Inhibitor Control Of Tissue Growth, John A. Adam

Mathematics & Statistics Faculty Publications

This note develops a simple model for the competition between activator and inhibitor control mechanisms in one-dimensional tissue growth. The pedagogic usefulness of such a model is that it is easily accessible to undergraduate applied mathematicians and is suggestive of behavior known to occur in more realistic biological systems (e.g., some types of cancer). The limitations of the model are obvious and can provide a basis for discussion of the applicability of complementary levels of description in mathematical modeling.

Theoretical Vibrational Study Of Fx...Nh3 (X=H, D, Li) Complexes, Y. Bouteiller, Z. Latajka, H. Ratajczak, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

This paper presents the first ab initio attempt to construct the stretching fundamentals ν_FX and ν_F...N (X=H, D, Li) in the FX...NH₃ complexes taking into account the mechanical anharmonicity. A potential‐energy surface V(r_FX,R_F...N) grid was generated at the self‐consistent‐field and second‐order Møller–Plesset levels. The coefficients fitting the potential‐energy surface up to the fourth order have been used to compute the ν_FX and ν_F...N stretching modes. The vibrational problem is solved by means of a variational treatment which includes the effects of mechanical …

Ab Initio Study Of Intermolecular Potential Of H2o Trimer, G. Chalasinski, M. M. Szczesniak, P. Cieplak, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

Nonadditive contribution to the interaction energy in water trimer is analyzed in terms of Heitler–London exchange, SCF deformation, induction and dispersion nonadditivities. Nonadditivity originates mainly from the SCF deformation effect which is due to electric polarization. However, polarization does not serve as a universal mechanism for nonadditivity in water. In the double‐donor configuration, for example, the Heitler–London exchange contribution is the most important and polarization yields the wrong sign. Correlation effects do not contribute significantly to the nonadditivity. A detailed analysis of the pair potential is also provided. The present two‐body potential and its components are compared to the existing …

Ab Initio Study Of The Intermolecular Potential Of Ar–H2o, G. Chalasinski, M. M. Szczesniak, Steve Scheiner

Chemistry and Biochemistry Faculty Publications

The combination of supermolecular Møller–Plesset treatment with the perturbation theory of intermolecular forces is applied in the analysis of the potential‐energy surface of Ar–H₂O. The surface is very isotropic with the lowest barrier for rotation of ∼35 cm⁻¹ above the absolute minimum. The lower bound for D_e is found to be 108 cm⁻¹ and the complex reveals a very floppy structure, with Ar moving freely from the H‐bridged structure to the coplanar and almost perpendicular arrangement of the C₂ –water axis and the Ar–O axis, ‘‘T‐shaped’’ structure. This motion is almost isoenergetic (energy change …

Preparation Of A Series Of N-Phenylamides Of 5-Bromo-6-Chloronicontinic Acid And 5-Bromo-2-Chloronicontinic Acid, Frank L. Setliff, Jody Z. Caldwell

Journal of the Arkansas Academy of Science

A series of N-phenylamides of 5-bromo 6-chloronicotinic acid and 5-bromo-2-chloronicotinic acid were synthesized by treatment of their freshly prepared acid chlorides with the appropriately ring substituted anilines. Thirty new compounds were prepared, and their structures were ascertained by elemental analyses and spectroscopic techniques. Spectroscopic trends in the infrared spectra of the two series were examined in an attempt to correlate structural and electronic effects to hydrogen bonding tendencies.

Preparation Of A Series Of Substituted N-Phenyl-5-Bromo-6-Chloro- And 5-Bromo-6-Chloronicotinates Of Potential Agricultural Interest, Frank L. Setliff, Maximillia M. Muguluma, Jody Z. Caldwell

Journal of the Arkansas Academy of Science

Substituted phenyl esters of 5-bromo-2-chloronicotinic acid and 5 bromo 6-chloronicotinic acid were prepared. The acids were first converted to their respective acid chlorides using thionyl chloride, and the acid chlorides were immediately transformed to the esters by treatment with the appropriately substituted phenol in sodium hydroxide solution. Aunique chloride displacement of bromide was observed on attempting to convert 5,6-dibromonicotinic acid to its acid chloride

Direct Determination Of Molecular-Orbital Symmetry Of H2s Using Polarized X-Ray Emission, R. Mayer, Dennis W. Lindle, S. H. Southworth, P. L. Cowan

Chemistry and Biochemistry Faculty Research

X-ray emission from the molecule H₂S is strongly polarized following excitation of a sulfur K-shell electron to an unoccupied subthreshold molecular orbital with a polarized x-ray beam. Changes in the polarization of the emission spectrum are observed as the incident beam's energy is swept across the subthreshold absorption resonance. The previously unresolved absorption resonance is shown experimentally to be primarily associated with a molecular orbital of b₂ symmetry, but with a high-excitation-energy component due to an orbital with a₁ symmetry. Satellite emission intensity is shown to depend on the primary photon energy and is therefore associated …

Hydrogen Sulfide And Radon In And Over The Western North Atlantic Ocean, T. W. Andreae, Gregory A. Cutter, N. Hussain, J. Radford-Knoery, M. O. Andreae

OES Faculty Publications

Atmospheric measurements of radon and hydrogen sulfide, and seawater measurements of total sulfide, free sulfide, and carbonyl sulfide, were made on a cruise in the western North Atlantic Ocean (October 24 to November 9, 1989). Measured values for ²²²Rn ranged from 3 to 70 pCi m⁻³, those for atmospheric hydrogen sulfide from 1 to 85 parts per trillion, and those for dissolved total and free sulfide in seawater from 33 to 930 pmol L⁻¹ and 0 to 73 pmol L⁻¹, respectively. A positive correlation between ²²²Rn and atmospheric H₂S was observed. …

Stroke Recurrence Within 2 Years After Ischemic Infarction, D. (Daniel) B. Hier, M. A. Foulkes, M. Swiontoniowski, R. L. Sacco, P. B. Gorelick, J. P. Mohr, T. R. Price, P. A. Wolf

Chemistry Faculty Research & Creative Works

We Prospectively Studied Stroke Recurrence in 1,273 Patients with Ischemic Stroke Who Were Entered into the Stroke Data Bank. Median Follow-Up Was 13 Months. the 2-Year Cumulative Recurrence Rate among These Patients Was 14.1%. Age, Sex, Race, History of Hypertension, Atrial Fibrillation, or Transient Ischemic Attacks, and Stroke Location Were Not Associated with a Higher Risk of Stroke Recurrence. Patients with an Elevated Blood Pressure, an Abnormal Initial Computed Tomogram, or a History of Diabetes Mellitus Were at a Higher Risk of Stroke Recurrence. in Contrast, Patients with an Infarct of Unknown Cause Were at a Lower Risk of Stroke …

Clinical-Computed Tomographic Correlations Of Lacunar Infarction In The Stroke Data Bank, A. Chamorro, R. L. Sacco, J. P. Mohr, M. A. Foulkes, C. S. Kase, T. K. Tatemichi, P. A. Wolf, T. R. Price, D. (Daniel) B. Hier

Chemistry Faculty Research & Creative Works

Lacunar Stroke Was Diagnosed in 337 (26%) of the 1,273 Patients with Cerebral Infarction among the 1,805 Total in the Stroke Data Bank. We Analyzed the 316 Patients with Classic Lacunar Syndromes. among These, 181 (57%) Had Pure Motor Hemiparesis, 63 (20%) Sensorimotor Syndrome, 33 (10%) Ataxic Hemiparesis, 21 (7%) Pure Sensory Syndrome, and 18 (6%) Dysarthria-Clumsy Hand Syndrome. No Striking Differences Were Found among the Risk Factors for the Lacunar Subtypes, But Differences Were Found between Lacunar Stroke as a Group and Other Types of Infarcts. Compared to 113 Patients with Large-Vessel Atherosclerotic Infarction, Those with Lacunar Stroke Had …

Deriving Clinical Prediction Rules From Stroke Outcome Research, Daniel B. Hier, Gilda Edelstein

Chemistry Faculty Research & Creative Works

Background and Purpose. Our Purpose Was to Determine Whether Clinical Prediction Rules Could Be Derived from Current Stroke Outcome Research. Summary of Report. We Reviewed 92 Articles on Stroke Outcome Research to Determine their Suitability for Implementation as a Clinical Prediction Rule. Methodological Problems in Many of These Studies Made Implementation of their Results as a Clinical Prediction Rule Difficult. Conclusions. Implementation of Stroke Outcome Research as Clinical Prediction Rules Would Be Facilitated by Description of Patient Population Demographics; Precise Definitions of Predictor and Outcome Measures; Stratification of Patients by Stroke Mechanism; Use of Adequate Patient Sample Sizes; and Description …

Novel Chemical Preparative Route For Semiconducting Mose2 Thin Films, K. C. Mandal, O. Savadogo

Faculty Publications

No abstract provided.

Dynamic And Spectroscopic Studies Of Triplet State Nitrogen, Scott M. Hurst

Dissertations

No abstract provided.

Trace Elements In Estuarine And Coastal Waters: U.S. Studies From 1986-1990, Gregory A. Cutter

OES Faculty Publications

The use of specialized analytical techniques, field studies, controlled laboratory experiments, and geochemical modeling have allowed U.S. investigators to expand our understanding of trace element cycling in coastal waters and estuaries. Considerable emphasis has been placed on quantifying the flux of trace elements within and through the coastal zone. In addition, substantial progress has been made in identifying the chemical speciation of many trace elements, providing a linkage between the geochemical and biochemical behavior of these elements. Another significant advance has been the use of trace elements as tracers of geochemical processes and water masses in the coastal environment.

Synthesis Of Aliphatic Bis(Thioureas), Donald G. Mcewen Iv '91

Honors Projects

The synthesis of aliphatic bifunctional thioureas have been attempted using several nucleophilic displacement reactions. The first method involved treatment of an aliphatic diamine with ammonium thiocyanate, under two different sets of reaction conditions. The first set of reaction conditions utilized water as the solvent, while second employed acetone as the solvent. Both of the reactions utilizing l,2-ethylenediamine and ammonium thiocyanate did not afford the desired bis(thioureas). In particular, the crystalline solid obtained from the reaction carried out in water was 57.8 ± 0.05 % thiocyanate by mass. The second nucleophilic addition method involved the treatment of both 1,2-ethylenediamine and 1,6-hexanediamine …

Automobile Emissions In Mexico City, Stuart P. Beaton, Gary A. Bishop, Donald H. Stedman

Fuel Efficiency Automobile Test Publications

No abstract provided.

On-Road Carbon Monoxide And Hydrocarbon Remote Sensing In The Chicago Area, Donald H. Stedman, Gary A. Bishop, James E. Peterson, Paul L. Guenther, Iain F. Mcvey, Stuart P. Beaton

Fuel Efficiency Automobile Test Publications

No abstract provided.

Evaluation Of A Remote Sensor For Mobile Source Co Emissions, Donald H. Stedman, Gary A. Bishop, Marc Pitchford

Fuel Efficiency Automobile Test Publications

EPA Pub 600/4-90/032 (NTIS PB91148320)

Carbon monoxide (CO) emission measurements of thousands of vehicles per day are possible with a recently evaluated remote sensor developed at the University of Denver. Funded by the Environmental Monitoring Systems Laboratory - Las Vegas (EMSL- LV) Innovative Research Program, the evaluation has demonstrated the comparability of volume concentration measurements made by this method with traditional emission monitoring instrumentation. Measurements are made unobtrusively as vehicles pass through an infrared light beam directed across one traffic lane about 25 centimeters above the pavement. A video camera records the vehicle registration number of each vehicle as its …

Role Of Surface Morphology In Wafer Bonding, W.P. Maszara, B.L. Jiang, A. Yamada, G.A. Rozgonyi, H. Baumgart, A.J.R. De Kock

Electrical & Computer Engineering Faculty Publications

The strain patterns detected by x-ray topography in wafers bonded for silicon-on-insulator (SOI) technology were found related to the flatness nonuniformity of the original wafers. Local stresses due to the bonding process are estimated to be about 1×10⁸ dynes/cm². The stress is reduced about 100 times for the thin (0.5 μm) SOI films. Most of the wafer deformation occurs during room temperature mating of the wafers. The deformation is purely elastic even at 1200 °C. The magnitude of the stress appears insignificant for complimentary metal-oxide-semiconductor devices performance.

Status Of Aluminum As A Risk Factor For Dialysis Encephalopathy And Alzheimer's Disease, P. B. Gorelick, D. (Daniel) B. Hier, C. Mangone, S. Robbins, A. Plioplys, S. Kathpalia

Chemistry Faculty Research & Creative Works

No abstract provided.