Digital Commons Network^™

The Strontium Isotope Geochemistry Of The Cenozoic Ocean, Jennifer Hess

Open Access Dissertations

A detailed record of the 87Sr/86Sr variations in seawater over the last 100 Ma has been determined by measuring the 87Sr/86Sr of well-preserved and well-dated fossil foraminifera from twelve Deep Sea Drilling Project cores of overlapping ages. Diagenetic alteration of the sample foraminifera was evaluated in three ways: by Sr/Ca ratios, by pore water chemistry, and by visual examination under the scanning electron microscope. Age assessments were made on the basis of magnetobiostratigraphy.

Foraminiferal ⁸⁷Sr/⁸⁶Sr measurements show an almost continuous increase in the seawater ⁸⁷Sr/⁸⁶Sr from 0.70738 at 100 Ma to 0.70920 today. The …

Accumulation, Persistence, And Elimination Of Microbial Indicators By Molluscan Shellfish, William Burkhardt Iii

Open Access Dissertations

The accumulation of fecal coliforms and several other indicator microorganisms (Escherichia coli, enterococci, Clostridium perfringens, and male-specific bacteriophage) by hard-shelled clams (Mercenaria mercenaria) was investigated with regard to season and temperature. Very high rates of accumulation were found for each of these indicator organisms during distinct periods in the spring. Uptake of indicators during these periods exceeded 2 SD of the mean annual accumulation rates. Except for these periods of 'hyper-accumulation', uptake of the indicators is at least partially temperature dependent. In general, bacteriophage and C. perfringens were accumulated by clams at significantly higher rates …

Modeling Vessel Mobility: The Gulf Of Mexico Shrimp Fleet, John Michael Ward

Open Access Dissertations

Given the heterogeneous nature of the fishing fleet and the complex behavior of vessels, the traditional marginalist supply models are not well suited for modelling vessel mobility. A discrete choice model is utilized in this analysis to predict the probability that a vessel will enter, exit, or remain in the Gulf of Mexico shrimp fishery based on a myopic profit maximization criteria. The multinomial legit model indicates that fisherman behavior in the Gulf of Mexico shrimp fishery is not influenced by stock variability. The crowding externality as represented by the size of the fishing fleet exhibited a strong negative impact …

Preconscious Factors In Romantic Attraction, Jay T. King

Open Access Dissertations

The purpose of this study was to discover whether or not the character and or behavior of parents is a factor in the romantic attraction and mate selections made by adults. The study examined the correlation between the parent's temperament and the partners temperament under two different conditions. The first condition involved a comparison when the participants identified their parent as a nurturant parent. The second condition involved a comparison when the participants identified their parent as a person with whom they had a conflicted parent-adolescent relationship. Four predictions were tested based upon psychoanalytic and psychodynamic theory; 1) adults will …

Correlates Of Sibling Jealousy And Parental Favoritism, Catherine Gray Deering

Open Access Dissertations

This study explores selected situational, relationship, and personality variables in sibling jealousy among college students (n=320). The research is based on a blend of social psychological and family systems theory, building on recent advances in romantic jealousy research. Vignettes portraying sibling and parent-initiated comparison situations were used as a projective technique to elicit sibling jealousy. Results indicate that parent-initiated comparisons produced significantly more jealousy than simple sibling comparisons. Sibling-initiated jealousy was significantly higher in domains of higher relevance or importance to the sample. Comparisons in physical attractiveness, social competence, and athletic achievement produced the highest levels of sibling jealousy. More …

An Analysis Of Serotonergic Control Of The Ventricle Of A Mollusc, Constance Leah Devlin

Open Access Dissertations

No abstract provided.

The Application Of Time-Frequency And Time-Scale Representations In Speech Analysis, Shubha L. Kadambe

Open Access Dissertations

No abstract provided.

Optimization Of Ibuprofen Formulation: Molecular Pharmaceutics Of The Biologically Active Stereoisomer, Alain Joseph Romero

Open Access Dissertations

A program of experiments comparing the formulation of rac-ibuprofen to that of (-)-S-ibuprofen was performed. Early investigations revealed that although complying with the United States Pharmacopeia compendial standards five different sources of rac-ibuprofen had different processing characteristics and as a result variable biopharmaceutical properties. Crystal habits critically influenced processing parameters. It was possible to identify low and high liquid requirement powders for the wet granulation end- point. Further analysis of rac-ibuprofen crystals was performed during the different stages of tablet manufacture. Phase diagrams confirmed that rac-ibuprofen crystallizes preferentially in the monoclinic space P21 c group as a true racemate. It …

Optimization And Its Applications On Pharmaceutical Conventional And Extended Release Solid Dosage Forms, Hann Rong Chueh

Open Access Dissertations

In the pharmaceutical industry, the product and process development problems usually involve a number of independent variables and are normally characterized by multiple objectives. Computer optimization techniques consisting of statistically valid experimental design can be employed to provide an economical way to obtain efficiently these multiple response parameters.

Acetaminophen is a poorly compressible analgesic and very large tablet with high dose level resulting in a corresponding very large table and poor compactability, the amount of added compressible excipient required to produce acceptable compaction behavior therefore is increased. Also, most commercially available high does (500 mg) acetaminophen tablets are manufactured from …

A Neurochemical Basis For Inhibition Of Neural Activity By Ethanol, Timothy Daniel Foley

Open Access Dissertations

No abstract provided.

Vesicle-Mediated Synthesis Of Colloidal Ceramic Particles, Suhas D. Bhandarkar

Open Access Dissertations

No abstract provided.

Selected Parameters Of Psychotherapy: A Transtheoretical Investigation, Armenio Santos Costa

Open Access Dissertations

No abstract provided.

Response Of Unsaturated Polyester, Vinyl Ester, And Acrylic Resins To Water Exposure, Sang-Baek Lee

Open Access Dissertations

No abstract provided.

Health Risk Reduction And Psychosocial Adaptation In Coronary Artery Bypass Graft Surgery Patients, Terence Edward Fitzgerald

Open Access Dissertations

No abstract provided.

Optical Responses Of Linear And Nonlinear Superlattices, Kelan Huang

Open Access Dissertations

No abstract provided.

Multidimensionality Of The Male Sex Role Stereotype: An Exploration Of Subtypes, Gwenyth Hughes Edwards

Open Access Dissertations

No abstract provided.

A Social Welfare Analysis Of Congestion And Water Quality Of Great Salt Pond, Block Island, Rhode Island, Kwo-Dong Wey

Open Access Dissertations

No abstract provided.

A Unifying Logic-Based Formalism For Semantic Data Models, James Vincent Vorbach

Open Access Dissertations

No abstract provided.

A Social Welfare Analysis Of Congestion And Water Quality Of Great Salt Pond, Black Island, Rhode Island, Kwo-Dong Wey

Open Access Dissertations

Great Salt Pond on Block Island, Rhode Island is a favorite site for recreational boaters in New England. However, overcrowding causes congestion and water pollution problems during summer. The Department of Environmental Management has closed the Pond to shellfishing every summer since 1986. Residents feels that recreational boaters are to blame and should take responsibility for controlling the problems. Recreational boaters, on the other hand, feel that they have already paid enough in docking and shellfishing license fees. The use of Pond is a source of conflict between these two groups.

This research uses the contingent valuation method to derive …

The Conversion Of Beta-Carotene To Retinal With Carotene Dioxygenase, Philip Edward Pivarnik

Open Access Dissertations

No abstract provided.

A Consideration Of The Role Of Physical Factors In The Annual Succession Of Copepods In Narragansett Bay, Rhode Island, Valerie Susan George

Open Access Dissertations

No abstract provided.

Efficient Management Of Groundwater Quality: An Evaluation Of Spatially Differentiated Policies, Naomi Zeitouni

Open Access Dissertations

No abstract provided.

The Effects Of Heat Shock On Developmentally Regulated Gene Expression In Myxococcus Xanthus, Deborah Elaine Britt

Open Access Dissertations

No abstract provided.

A Biosurfactant Of Bacterial Origin And Its Characterization, Mohammed I. Al-Hazmi

Open Access Dissertations

A microorganism capable of synthesizing biosurfactant from cheap and renewable water-soluble substrate such as carbohydrate was isolated' from the environment in our laboratory. It was selected from other isolates by screening for its ability to reduce the tensiometric properties of the culture broth. The isolated organism (JIZAN-1) produced significant extracellular surfactant activity during growth in batch culture on modified mineral salts medium (MMSM) containing 0.2% glucose as a carbon source and 0.02% yeast extract as a growth cofactor. This was demonstrated by lowering of the whole broth surface tension to less than 27.0 dynes/cm and the interfacial tension to less …

Physical Factors Affecting Textural Hardening Of Frozen Fish Mince, Ki Sun Yoon

Open Access Dissertations

No abstract provided.

Spectral Dependence Of The Electro-Optic Coefficients And The Quantum Efficiency Near The Band Edge In Gallium Arsenide/Aluminum Gallium Arsenide Multiple Quantum Well Modulator Structures, George Thomas Valliath

Open Access Dissertations

No abstract provided.

Selection Of Signal And System Models By Bayesian Predictive Densities, Petar M. Djuric

Open Access Dissertations

No abstract provided.

Offset Screen And Pseudodiffusion Models For Prediction Of Filtration Phenomena In Real Fibrous Filter Media, Arif Mujib Khan

Open Access Dissertations

No abstract provided.

Performance Of Juvenile Atlantic Salmon (Salmo Salar) Introduced Into A Stream: Smolt Development And Thyroid Hormones, Timothy Aaron Whitesel

Open Access Dissertations

No abstract provided.

Microencapsulated Diets For Larvae Of The Inland Silversides, Menidia Beryllina, Henry Elliot Leibovitz

Open Access Dissertations

No abstract provided.