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The Effect Of Adhesive Coatings On The Microbial Barrier Properties Of Porous Medical Packaging Materials, Alison M. Kayser

Theses

The most important characteristic for porous medical packaging is the ability to keep devices free from microorganisms from the point of sterilization to the point of use. Downstream converting processes can affect the properties of a package material. One of the most common converting steps is the addition of an adhesive coating. The current test standard for measuring the ability of a porous barrier material to serve as a microbial barrier is ASTM 1608-95. This test method was used to measure the microbial barrier properties of a wide selection of packaging materials in both their coated and uncoated forms. The …

Impromptu Creation Of Metal Sculpture, Yu-Ting Shih

Theses

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A Study Of The Effects Of Constructivist Based Vs. Traditional Direct Instruction On 8th Grade Science Comprehension, Clair T. Berube

Theses and Dissertations in Urban Services - Urban Education

Studies conducted nationwide over the past several decades point consistently to the evidence that American school children lag behind several other countries in science scores. Problems arise from this dilemma, including the question of the ability of our youngsters to compete nationally and globally in the sciences as adults. Current research in this area of scores currently studies mostly mathematics. The few studies conducted concerning science mainly highlight students in other countries and neglects minorities and females regarding outcomes.

By contrast, this study investigated the effects of teacher types (also defined as teaching styles or classroom orientation) on student outcomes …

New Sequential And Scalable Parallel Algorithms For Incomplete Factor Preconditioning, David A. Hysom

Computer Science Theses & Dissertations

The solution of large, sparse, linear systems of equations Ax = b is an important kernel, and the dominant term with regard to execution time, in many applications in scientific computing. The large size of the systems of equations being solved currently (millions of unknowns and equations) requires iterative solvers on parallel computers. Preconditioning, which is the process of translating a linear system into a related system that is easier to solve, is widely used to reduce solution time and is sometimes required to ensure convergence. Level-based preconditioning (ILU(ℓ)) has long been used in serial contexts and is widely recognized …

The Validation Of A Detailed Strategic Planning Process Model For The Implementation Of Distance Education In Higher Education, Kenneth Phillip Pisel Jr.

Theses and Dissertations in Urban Services - Urban Education

The purpose of this study was to develop, refine, and validate a model of the strategic planning process for distance education. To achieve this end, the informed opinion from a population of peer-nominated experts was solicited over three rounds of iterative Delphi questionnaires administered via electronic mail. Using descriptive statistics to analyze central tendency and variation, the straw model was refined into a validated model by the final Delphi round. In developing this model, the study answered specific questions about the following: (1) The impact of volatile technological change on a strategic distance education plan. (2) The optimum size and …

Trachelomonas Spp. And Other Euglenophyceae Taxa In A Southeastern Virginia Lake, Harold G. Marshall

Biological Sciences Faculty Publications

Trachelomonas species from Lake Kilby, a reservoir lake in southeastern Virginia are described with supportive electron micrographs. The most abundant Trachelomonas species were T. hispida and T. volvocina. Other members of the Euglenophyceae occurring in this lake are identified.

The Effect Of Spectral Composition On The Photochemical Production Of Hydrogen Peroxide In Lake Water, Andrea Y. L. Wong, George T. F. Wong

OES Faculty Publications

Hydrogen peroxide was produced when samples of lake water were exposed to direct or filtered sunlight in which UV or UV(B+C) light was selectively removed. In all cases, the concentration of hydrogen peroxide increased linearly with time-integrated irradiance. While both visible and UV light can induce the formation of hydrogen peroxide, the contribution from the latter was disproportionately large as it was responsible for about two-thirds of the formation of hydrogen peroxide. Among the UV lights, the contributions from UV-A and UV-(B+C) light were 70% and 30% respectively. The contribution from UV-A light was equivalent to about one half of …

Seasonal Climatology Of Hydrographic Conditions In The Upwelling Region Off Northern Chile, J. L. Blanco, A. C. Thomas, M.-E. Carr, P. T. Strub

OES Faculty Publications

Over 30 years of hydrographic data from the northern Chile (18°S-24°S) upwelling region are used to calculate the surface and subsurface seasonal climatology extending 400 km offshore. The data are interpolated to a grid with sufficient spatial resolution to preserve crossshelf gradients and then presented as means within four seasons: austral winter (JulySeptember), spring (October-December), summer (January-March), and fall (April-June). Climatological monthly wind forcing, surface temperature, and sea level from three coastal stations indicate equatorward (upwelling favorable) winds throughout the year, weakest in the north. Seasonal maximum alongshore wind stress is in late spring and summer (DecemberMarch). Major water masses …

Hydrogeological Characterization Of The South Oyster Bacterial Transport Site Using Geophysical Data, Susan S. Hubbard, Jinsong Chen, John Peterson, Ernest L. Majer, Kenneth H. Williams, Donald J. Swift, Brian Mailloux, Yoram Rubin

OES Faculty Publications

A multidisciplinary research team has conducted a field-scale bacterial transport study within an uncontaminated sandy Pleistocene aquifer near Oyster, Virginia. The overall goal of the project was to evaluate the importance of heterogeneities in controlling the field-scale transport of bacteria that are injected into the ground for remediation purposes. Geochemical, hydrological, geological, and geophysical data were collected to characterize the site prior to conducting chemical and bacterial injection experiments. In this paper we focus on results of a hydrogeological characterization effort using geophysical data collected across a range of spatial scales. The geophysical data employed include surface ground-penetrating radar, radar …

Uptake Of Dissolved Organic Selenides By Marine Phytoplankton, Stephen B. Baines, Nicholas S. Fisher, Martina A. Doblin, Gregory A. Cutter

OES Faculty Publications

Se is present in multiple oxidation states in nature, each of which has unique chemical and biological reactivities. As a consequence, the rate of Se incorporation into food webs or its role as either a limiting nutrient or a toxic substance is a function of complex biogeochemistry. In particular, little is understood about the accumulation of dissolved organic selenides by phyto- or bacterioplankton. We assessed the bioavailability of dissolved organic selenides to marine and estuarine phytoplankton by presenting various algal species with filtered lysates of the diatom, Thalassiosira pseudonana, grown on media amended with radiolabeled selenite (⁷⁵Se[IV]). …

Control Of Phytoplankton Growth By Iron Supply And Irradiance In The Subantarctic Southern Ocean: Experimental Results From The Saz Project, P. W. Boyd, A. C. Crossley, G. R. Ditullio, F. B. Griffiths, D. A. Hutchins, B. Queguiner, Peter N. Sedwick, T. W. Trull

OES Faculty Publications

The influence of irradiance and Fe supply on phytoplankton processes was studied, north (47°S, 142°E) and south (54°S, 142°E) of the Subantarctic Front in austral autumn (March 1998). At both sites, resident cells exhibited nutrient stress (F_v/F_m 0 at 47°S and 9% I₀ at 54°S because of MLDs of 40 (47°S) and 90 m (54°S), when these stations were occupied. The greater MLD at 54°S is reflected by tenfold higher cellular chlorophyll a levels in the resident phytoplankton. In the 47°S experiment, chlorophyll a levels increased to >1 μg/L^-1 only in the high-Fe treatments, regardless …

Control Of Phytoplankton Growth By Iron And Silicic Acid Availability In The Subantarctic Ocean: Experimental Results From The Saz Project, D. A. Hutchins, Peter N. Sedwick, G. R. Ditullio, P. W. Boyd, B. Queguiner, F. B. Griffiths, C. Crossley

OES Faculty Publications

Subantarctic Southern Ocean surface waters in the austral summer and autumn are characterized by high concentrations of nitrate and phosphate but low concentrations of dissolved iron (Fe, similar to0.05 nM) and silicic acid (Si, <1 muM). During the Subantarctic Zone AU9706 cruise in March 1998 we investigated the relative importance of Fe and Si in controlling phytoplankton growth and species composition at a station within the subantarctic water mass (46.8degreesS, 142degreesE) using shipboard bottle incubation experiments. Treatments included unamended controls; 1.9 nM added iron (+Fe); 9 muM added silicic acid (+Si); and 1.9 nM addediron plus 9 muM added silicic acid (+Fe+Si). We followed a detailed set of biological and biogeochemical parameters over 8 days. Fe added alone clearly increased community growth rates and nitrate drawdown and altered algal community composition relative to control treatments. Surprisingly, small, lightly silicified pennate diatoms grew when Fe was added either with or without Si, despite the extremely low ambient silicic acid concentrations. Pigment analyses suggest that lightly silicified chrysophytes (type 4 haptophytes) may have preferentially responded to Si added either with or without Fe. However, for many of the parameters measured the +Fe+Si treatments showed large increases relative to both the +Fe and +Si treatments. Our results suggest that iron is the proximate limiting nutrient for chlorophyll production, photosynthetic efficiency, nitrate drawdown, and diatom growth, but that Si also exerts considerable control over algal growth and species composition. Both nutrients together are needed to elicit a maximum growth response, suggesting that both Fe and Si play important roles in structuring the subantarctic phytoplankton community.

Effects Of Iron, Silicate, And Light On Dimethylsulfoniopropionate Production In The Australian Subantarctic Zone, G. R. Ditullio, P. N. Sedwick, D. R. Jones, P. W. Boyd, A. C. Crossley, D. A. Hutchins

OES Faculty Publications

Shipboard bottle incubation experiments were performed to investigate the effects of iron, light, and silicate on algal production of particulate dimethylsulfoniopropionate (DMSP_p) in the Subantarctic Zone (SAZ) south of Tasmania during March 1998. Iron enrichment resulted in threefold to ninefold increases in DMSP_p concentrations relative to control treatments, following 7 and 8-day incubation experiments. Additions of Fe and Si preferentially stimulated the growth of lightly-silicified pennate diatoms and siliceous haptophytes, respectively, to which we attribute the increased DMSP_p production in the incubation bottles. Both of these algal groups were previously believed to be low DMSP_{p …}

Introduction To Special Section: Saz Project, T. W. Trull, Peter N. Sedwick, F. B. Griffiths, S. R. Rintoul

OES Faculty Publications

Oceanographic processes in the subantarctic region contribute crucially to the phys. and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Center organized the SAZ Project, a multidisciplinary, multiship study carried out south of Australia in the austral summer of 1997-1998. We present an overview of the SAZ Project and some of its major results.

Holocene Sediment Records From The Continental Shelf Of Mac. Robertson Land, East Antarctica, Peter N. Sedwick, Peter T. Harris, Lisette G. Robertson, Gary M. Mcmurtry, Maximilian D. Cremer, Philip Robinson

OES Faculty Publications

Geochemical records are presented for five sediment cores from basins on the continental shelf of Mac. Robertson Land, East Antarctica. The cores contain 2-4 m thick sequences of hemipelagic, siliceous mud and ooze (SMO) deposited under seasonally open marine conditions. The inner and middle shelf SMO sequences are massive dark olive green material, whereas the outer shelf SMO sequences are dark olive material interspersed with light olive green layers similar to1-10 cm thick. The biogenic material is dominated by marine diatoms including Fragilariopsis curta, Fragilariopsis cylindrus, and Chaetoceros spp. in the dark-colored SMO and Corethron criophilum in the …

Growth Rate Variability And Lipofuscin Accumulation Rates In The Blue Crab Callinectes Sapidus, Se-Jong Ju, David H. Secor, H. Rodger Harvey

OES Faculty Publications

To better understand growth and age-pigment (lipofuscin) accumulation rates of the blue crab Callinectes sapidus under natural conditions, juveniles (33 to 94 mm carapace width) were reared in outdoor ponds for over 1 yr. Growth rates, measured by carapace width, during summer and fall exceeded all those reported in the literature; the initial carapace width of 59 ± 14 mm (mean ± SD) increased to 164 ± 15 mm within a 3 mo period. No growth occurred during winter months (November to April) at low water temperatures. Growth rates of crabs in ponds were substantially higher (von Bertalanffy growth parameter …

Legal Systems, Decisionmaking, And The Science Of Earth's Systems: Procedural Missing Links, Nicholas A. Robinson

Elisabeth Haub School of Law Faculty Publications

Decisionmakers disregard scientific findings regarding environmental conditions, despite recommendations of the 1992 "Earth Summit" in Agenda 21 that science should provide a foundation for sustainable development. Although environmental degradation trends continue to exacerbate, decisionmakers address only selected issues. This Article examines an analytic paradigm for evaluating when decisionmakers are ready to address a problem and describes the catalytic role that scientific information can serve in prompting remedial action. Unless systematic procedures require evaluation of environmental scientific findings in the normal course of decisionmaking, science will continue to be ignored. One hallmark of Environmental Law has been to fashion such procedures, …

Backdoor Liability From Internet Telecommuters, Mark J. Maier

Computer Law Review and Technology Journal

Internet telecommuters work from home and access their employer's internal network over the Internet. This relatively new style of work has increased in popularity through the years, with an estimated 4.5 million workers Internet telecommuting in 1999. While employers enjoy compelling benefits such as reducing overhead costs, Internet telecommuting raises new security concerns for employers by exposing their internal networks to "backdoor attacks" that exploit the telecommuter's connection. The recent backdoor attack on Microsoft's source code illustrates the extent to which such attacks threaten confidential information. If such confidential information belongs to a client or third party, then the telecommuter's …

Identification Of The Domains Of Urer, An Arac-Like Transcriptional Regulator Of The Urease Gene Cluster In Proteus Mirabilis, Carrie A. Poore, Christopher Coker, Jonathan D. Dattelbaum, Harry L.T. Mobley

Chemistry Faculty Publications

Proteus mirabilis urease catalyzes the hydrolysis of urea to CO₂ and NH₃, resulting in urinary stone formation in individuals with complicated urinary tract infections. UreR, a member of the AraC family, activates transcription of the genes encoding urease enzyme subunits and accessory proteins, ureDABCEFG, as well as its own transcription in the presence of urea. Based on sequence homology with AraC, we hypothesized that UreR contains both a dimerization domain and a DNA-binding domain. A translational fusion of the leucine zipper dimerization domain (amino acids 302 to 350) of C/EBP and the C-terminal half of UreR …

Gonzalez Exrel. Gonzalez V. Reno. 212 F.3d 1338, Rehearing Denied, 215 F.3d 1243, Certiorari Denied, 120 S.Ct. 2737 (2000). U.S. Court Of Appeals For The Eleventh Circuit, June 1, 2000., David Abraham

Articles

No abstract provided.

Making Blacks Foreigners: The Legal Construction Of Former Slaves In Post-Revolutionary Massachusetts, Kunal Parker

Articles

No abstract provided.

Anchoring Justice: The Constitutionality Of The Local Law Enforcement Act In United States V. Morrison'S Shifting Seas, Anthony E. Varona, Kevin Layton

Articles

No abstract provided.

Foster Care: The Border Of Family Identity Maintaining, (Re)Creating, Destroying, Zanita E. Fenton

Articles

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Faith In Justice: Fiduciaries, Malpractice & Sexual Abuse By Clergy, Zanita E. Fenton

Articles

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"Please Let Me Be Heard:" The Right Of A Florida Foster Child To Due Process Prior To Being Committed To A Long-Term, Locked Psychiatric Institution, Bernard P. Perlmutter, Caroline S. Salisbury

Articles

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Studies On The Cranial Osteology Of The Blind Catfish Horaglanis Krishnai Menon (Pisces, Clariidae), T. V. Anna Mercy, N. Krishna Pillai

International Journal of Speleology

Horaglanis krishnai Menon is a blind catfish inhabiting the dug- out wells at Kottayam, Kerala, South India. Studies on the cranial osteology of the fish show that the bones on the skull are firmly articulated. The frontoparietal fontanella is very large so that the cranium virtually lacks a roof. The sphenotics and alisphenoids are hardly recognizable and the orbital bones are entirely lacking. In osteological features H. krishnai closely resembles Uegitglanis zammaroni. But in H. krishnai the orbital bones are further reduced or even absent. The fontanella is larger than that of any other known catfish. These two species …

Criminal Law In Cyberspace, Neal K. Katyal

Georgetown Law Faculty Publications and Other Works

Two of the most talked-about crimes of the year, the ILoveYou computer worm and the denial of service attacks on Yahoo, eBay, and ETrade, suggest that a new form of crime is emerging: cybercrime. Thousands of these crimes occur each year, and the results are often catastrophic; in terms of economic damage, the ILoveYou worm may have been the most devastating crime in history, causing more than $11 billion in losses.

This paper asks how cybercrime is best deterred. It identifies five constraints on crime - legal sanctions, monetary perpetration cost, social norms, architecture, and physical risks - and explains …

The Sex Discrimination Argument In Gay Rights Cases, Nan D. Hunter

Georgetown Law Faculty Publications and Other Works

The argument that laws that discriminate on the basis of sexual orientation in fact discriminate on the basis of sex is not new. Advocates have been pressing this claim for almost thirty years. Simply put, the argument is that a statute that bars a sexual relationship between two women or two men discriminates on the basis of sex because either partner could have had the same relationship with a person of the opposite sex.

Lawyers For The Abused And Lawyers For The Accused: An Interfaith Marriage, Abbe Smith, Ilene Seidman

Georgetown Law Faculty Publications and Other Works

In this article, we will explore what unites lawyers for the abused and lawyers for the accused. In Part II, we will discuss our connection as poverty lawyers concerned about the dignity of individual clients. In Part III, we will discuss our shared commitment to the adversarial system, legal process, and access to justice. In Part IV, we will address the challenge of teaching students who represent victims or perpetrators to be zealous and devoted advocates - but also to care about social and legal injustice on both sides.

What's So Bad About Bush V. Gore? An Essay On Our Unsettled Election, Louis Michael Seidman

Georgetown Law Faculty Publications and Other Works

There is a chance that Bush v. Gore may begin a process of laying a more attractive and realistic foundation for constitutionalism than the Official Story provides. The very fact that the Court is not politically independent and that it could not settle the matter in a disinterested, apolitical fashion might set us down a path toward a more mature version of constitutional law. The politically tendentious character of the Coon's reasoning demonstrates that our core constitutional commitments are subject to political manipulation. Ironically, public understanding of this malleability makes our politics more, rather than less, inclusive. It does so …