Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2003

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 1861 - 1890 of 8701

Full-Text Articles in Entire DC Network

Explaining And Predicting Patterns In Stochastic Population Systems, Shandelle M. Henson, Aaron A. King, R. F. Costantino, J. M. Cushing, Brian Dennis, Robert A. Desharnais Aug 2003

Explaining And Predicting Patterns In Stochastic Population Systems, Shandelle M. Henson, Aaron A. King, R. F. Costantino, J. M. Cushing, Brian Dennis, Robert A. Desharnais

Faculty Publications

Lattice effects in ecological time-series are patterns that arise because of the inherent discreteness of animal numbers. In this paper, we suggest a systematic approach for predicting lattice effects. We also show that an explanation of all the patterns in a population time-series may require more than one deterministic model, especially when the dynamics are complex.

Go to article

Toward A Criminal Law For Cyberspace: Distributed Security, Susan Brenner Aug 2003

Toward A Criminal Law For Cyberspace: Distributed Security, Susan Brenner

ExpressO

The article analyzes the structure and evolution of the current, traditional model of law enforcement and explains why this model is not an effective means of addressing computer-facilitated criminal activity. It begins by analyzing the operation of rules in collective systems composed of biological or artificial entities; it explains that every such system utilizes basic, constitutive rules to maintain both internal and external order. The article explains that intelligence has a profound effect upon a system’s ability to maintain internal order. Intelligence creates the capacity for deviant behavior, i.e., the refusal to abide by constitutive rules, and this requires the …

Go to article

The Role Of Theory And Policy In The Educational Treatment Of Language Minority Students: Competitive Structures In California, Tom T. Stritikus, Eugene Garcia Aug 2003

The Role Of Theory And Policy In The Educational Treatment Of Language Minority Students: Competitive Structures In California, Tom T. Stritikus, Eugene Garcia

Education Policy Analysis Archives (EPAA)

… In this article, we examine the theoretical and policy-based positions currently competing to shape the nature of educational practice for language minority students. We highlight the salient theoretical differences between additive and subtractive conceptions for the education of language minority students and their policy- and practice-based implications. ...

Go to article

Education Policy Analysis Archives 11/26 , Arizona State University, University Of South Florida Aug 2003

Education Policy Analysis Archives 11/26 , Arizona State University, University Of South Florida

College of Education Publications

Role of theory and policy in the educational treatment of language minority students : competitive structures in California / Tom T. Stritikus [and] Eugene Garcia.

Go to article

Dispersal Of Sagebrush-Steppe Seeds By The Western Harvester Ant (Pogonomyrmex Occidentalis), John F. Mull Aug 2003

Dispersal Of Sagebrush-Steppe Seeds By The Western Harvester Ant (Pogonomyrmex Occidentalis), John F. Mull

Western North American Naturalist

Like many seed-harvesting ants, the western harvester ant (Pogonomyrmex occidentalis) can act as both a predator and a seed disperser. Dispersal results when seeds are dropped en route to the nest, are left in nest granaries when colonies die or are abandoned, or are removed from granaries and discarded in nest middens. This study examined the density and species identity of seeds discarded in harvester ant nest middens and compared them with those found in nearby soils. Nineteen species of seeds were recovered from middens, compared with 13 species in 5-m reference areas and 9 species in adjacent …

Go to article

Geobotany Of The Niobrara Chalk Barrens In Colorado: A Study Of Edaphic Endemism, Sylvia Kelso, Nathan W. Bower, Kirsten E. Heckmann, Paul M. Beardsley, Darren G. Greve Aug 2003

Geobotany Of The Niobrara Chalk Barrens In Colorado: A Study Of Edaphic Endemism, Sylvia Kelso, Nathan W. Bower, Kirsten E. Heckmann, Paul M. Beardsley, Darren G. Greve

Western North American Naturalist

The chalk barrens of the Niobrara Formation in the Arkansas River valley of Colorado exhibit a high degree of plant endemism and rarity. We examined their geochemistry and structure as well as the reproductive ecology of their signature species Mirabilis rotundifolius to assess factors influencing endemism. While no single component consistently identified the barren soils, the natural locations that support Mirablilis can be identified using elemental profiles from a cluster analysis of soil extracts. Because seeds germinate and plants proliferate in transplant gardens with non-calcic soils, bedrock and soil chemistry do not appear to be determinant components of endemism. Mirabilis …

Go to article

Insect-Mediated Pollination In Slickspot Peppergrass, Lepidium Papilliferum L. (Brassicaceae), And Its Implications For Population Viability, Ian C. Robertson, Danielle Klemash Aug 2003

Insect-Mediated Pollination In Slickspot Peppergrass, Lepidium Papilliferum L. (Brassicaceae), And Its Implications For Population Viability, Ian C. Robertson, Danielle Klemash

Western North American Naturalist

Field experiments on the pollination biology of slickspot peppergrass, Lepidium papilliferum L. (Brassicaceae), a rare species endemic to microsites in sagebrush-steppe habitat in southwestern Idaho, were conducted at 2 sites from May to July 2001. Site KB contained over 10,000 plants, whereas site WG contained less than 150 plants. Insect exclusion experiments revealed that seed production in L. papilliferum is dependent on insect-mediated pollination; median percent seed set dropped from 70% to 2% when insects were excluded from flowers. A total of 25 insect families from 5 orders visited L. papilliferum flowers: 24 families at KB and 11 families at …

Go to article

Assortative Mating In Insects: Sexual Selection Vs. Sampling Artifact, Ruth Bernstein, Stephen Bernstein Aug 2003

Assortative Mating In Insects: Sexual Selection Vs. Sampling Artifact, Ruth Bernstein, Stephen Bernstein

Western North American Naturalist

In this report we analyze patterns of size-assortative mating in an insect genus by (1) describing the consistency and strength of assortative mating among populations of a species and among species of a genus, and (2) determining the role of sampling artifacts in generating this nonrandom pattern of mating. Our data consist of 18 samples of soldier beetles (8 species of the genus Chauliognathus) from 17 sites within the southwestern United States. Of the 18 samples, just 6 exhibited significant correlations between elytron lengths of mating pairs. We show how these and other significant correlations are generated by 3 …

Go to article

Is Mandatory Price Reporting Good For The Cattle Industry?, Azzeddine Azzam Aug 2003

Is Mandatory Price Reporting Good For The Cattle Industry?, Azzeddine Azzam

Cornhusker Economics

On April 2, 2001 the Agricultural Marketing Service (AMS) implemented the Livestock Mandatory Price Reporting Act, mandating collection and reporting of transaction data for cattle, swine, lambs and other livestock products. What prompted the Act, which was pushed through Congress by some livestock organizations, was concern over price discovery in the light of increased concentration in the livestock industry and increased use of captive supplies. As more and more animals are transacted through contracts, the argument goes, less and less price information becomes available for independent livestock producers.

Go to article

Distributional Information On Birds From Egg Sets Collected By Henry Rogers Durkee In 1870 In Southwestern Wyoming, Douglas B. Mcnair, James P. Dean Aug 2003

Distributional Information On Birds From Egg Sets Collected By Henry Rogers Durkee In 1870 In Southwestern Wyoming, Douglas B. Mcnair, James P. Dean

Western North American Naturalist

Henry Rogers Durkee collected 74 egg sets of 27 avian species in 1870 at Gilmer, Uinta County, in southwestern Wyoming. Despite the paucity of documented breeding evidence from this region during the late 19th and early 20th centuries, his material at the Smithsonian Institution was generally overlooked and has never been critically examined. Durkee's egg sets included 5 species (Sandhill Crane, Grus candensis; Northern Rough-winged Swallow, Stelgidoteryx serripennis; Grasshopper Sparrow, Ammodramus savannarum; Fox Sparrow, Passerella iliaca; Cassin's Finch, Carpodacus cassinii) whose breeding distribution was then poorly known, 25 to more than 70 years before nests …

Go to article

Breeding Populations Of Swainson's Hawks, Red-Tailed Hawks, And Golden Eagles In North Central Oregon: 1975–1982 And 1999, Stewart W. Janes Aug 2003

Breeding Populations Of Swainson's Hawks, Red-Tailed Hawks, And Golden Eagles In North Central Oregon: 1975–1982 And 1999, Stewart W. Janes

Western North American Naturalist

Populations of breeding Swainson's Hawks (Buteo swainsoni), Red-tailed Hawks (B. jamaicensis), and Golden Eagles (Aquila chrysaetos) present in 1999 were compared with populations present between 1975 and 1982 at a 129-km2 site in north central Oregon. Populations of Red-tailed Hawks and Golden Eagles remained unchanged, but the number of Swainson's Hawks pairs increased from 15 to 17. In 1999 Golden Eagles used nests occupied between 1975 and 1982, and 7 of 31 pairs of Red-tailed Hawks used nests occupied in earlier years. No Swainson's Hawks nested in trees occupied earlier. Few changes in …

Go to article

Estimates Of The Incidence Of Mistletoes In Pinyon-Juniper Woodlands Of The Coconino National Forest, Arizona, Carolyn M. Daugherty, Robert L. Mathiasen Aug 2003

Estimates Of The Incidence Of Mistletoes In Pinyon-Juniper Woodlands Of The Coconino National Forest, Arizona, Carolyn M. Daugherty, Robert L. Mathiasen

Western North American Naturalist

The relative incidence of mistletoes found in pinyon-juniper woodlands is estimated for the Coconino National Forest, Arizona, using a roadside survey. Approximately 50% of the pinyon-juniper woodlands surveyed were infested with juniper mistletoes (Phoradendron juniperinum or P. capitellatum). In contrast, only about 12% of the areas surveyed were infested with pinyon dwarf mistletoe (Arceuthobium divaricatum). In these infested woodlands, 70% with juniper mistletoes and 44% with pinyon dwarf mistletoe were lightly infested. Most areas where pinyon dwarf mistletoe populations were observed (90%) also had juniper mistletoe (P. juniperinum) present, but many juniper mistletoe populations …

Go to article

Hlanagement Of Carnivore Predation As A Means To Reduce Livestock Losses: The Study Of Coyotes (Canis Latrans) In North America, Eric M. Gese Aug 2003

Hlanagement Of Carnivore Predation As A Means To Reduce Livestock Losses: The Study Of Coyotes (Canis Latrans) In North America, Eric M. Gese

United States Department of Agriculture Wildlife Services: Staff Publications

Many carnivore populations throughout the world are declining due to expansion of human populations, habitat loss, illegal poaching, legal hunting, disease, habitat fragmentation, declines in native prey, and increased competition with livestock and other human land uses. A major obstacle facing conservation efforts, reintroduction programs, and recovery plans for many carnivore species throughout the world is the continual issue of depredations by carnivores on agricultural interests (hlech 1996). In the United States, efforts to reintroduce and/or recover wolves (Canis lupus) and grizzly bears (Ursus arcios) in the northern Rocky Mountains has been met with much opposition …

Go to article

Talking 'Bout My Antitrust Generation: Competition For And In The Field Of Competition Law, Fred S. Mcchesney Aug 2003

Talking 'Bout My Antitrust Generation: Competition For And In The Field Of Competition Law, Fred S. Mcchesney

Law and Economics Papers

Twenty-seven years ago I took my law-school antitrust course, from a fledgling assistant professor who had just left the Federal Trade Commission. My performance was adequate, earning one of the better grades in the course, but not spectacular. Unspectacular enough that afterwards the professor said it disappointed him. In retrospect, I think I under-performed because I was a soon-to-be economist as well as a budding lawyer. Like many people back then, I approached antitrust with a presumption that the gears of industrial-organization economics and antitrust law meshed more or less synchronously. But such a presumption was unwarranted, to say the …

Go to article

Treatment Of Breast Cancer, Delbert Miles, Elena Goun, Krasnych Pertrovna, Pimenova Valentinovna, Solodnikov Yyrjevitsh Aug 2003

Treatment Of Breast Cancer, Delbert Miles, Elena Goun, Krasnych Pertrovna, Pimenova Valentinovna, Solodnikov Yyrjevitsh

UCF Patents

Compounds of the class of 4-oxo-butenoic acid derivatives are disclosed along with the surprising use property of these compounds as a anti-tumor agents in humans against breast carcinoma, which include: 2-(N'-Fluoren-9-ylidene-hydrazino)-5,5-dimethyl-4-oxo-hex-2-enoic acid methyl ester (0F-06), 1-(2,4-Dimethyl-phenyl)-2,4-dihydroxy-3-(4-methyl-benzoyl)-5-oxo-2,5-dihydro-1H-pyrrole-2-carboxylic acid methyl ester (1F-07), 4-(4-Methoxy-phenyl)-2,4-dioxo-3-(phenyl-hydrazono)-butyric acid (3F-10), 4-(4-Chloro-phenyl)-2,4-dioxo-3-(phenyl-hydrazono)-butyric acid ethyl ester (3F-11), 2-Hydroxy-4-oxo-4-(2,3,5,6-tetrafluoro-4-methoxy-phenyl)-but-2-enoic acid (3F-15), and 4,4-Dihydroxy-5-(4-methyl-benzoyl)-2-phenyl-2,4-dihydro-pyrazol-3-one (3F-16) as well as some novel derivatives of these compounds claimed (see Table 2). The invention also encompasses a class of the compounds with the novel property of anti-tumor activity against human breast cancer, which includes the following compounds 4-(4-Ethoxy-phenyl)-2-(N'-fluoren-9-ylidene-hydrazino)-2-hydroxy-4-oxo-butyric acid methyl ester (0F-13); 2-{N'-[1-(4-Chloro-phenyl)-ethylidene]-hydrazino}-4-oxo-4-phenyl-but-2-enoic acid methyl …

Go to article

Monitoring Predators To Optimize Their Management For Marine Turtle Nest Protection, Richard M. Engeman, R. Erik Martin, Bernice Constantin, Ryan Noel, John Woolard Aug 2003

Monitoring Predators To Optimize Their Management For Marine Turtle Nest Protection, Richard M. Engeman, R. Erik Martin, Bernice Constantin, Ryan Noel, John Woolard

United States Department of Agriculture Wildlife Services: Staff Publications

The fundamental conservation focus for Hobe Sound National Wildlife Refuge (HSNWR), Florida is to provide protected nesting habitat for three threatened or endangered marine turtle species. Turtle nesting and hatching spans from early spring to fall each year. Left unchecked, nest predation by raccoons and armadillos would destroy most turtle nests. Predators are removed to protect nests, primarily with a one person-month contract using control specialists. We maximized the efficiency of predator removal by using a passive tracking index to: (1)optimize the timing and strategy for predator removal, (2)minimize labor by identifying areas where predator removal would have maximal effects, …

Go to article

West Nile Virus: Emerging Threat To Public Health And Animal Health, Robert G. Mclean Aug 2003

West Nile Virus: Emerging Threat To Public Health And Animal Health, Robert G. Mclean

United States Department of Agriculture Wildlife Services: Staff Publications

West Nile virus (WNV) is in the genus Flavivirus, family Flavioiridae, and is closely related to other members of this genus: Japanese encephalitis virus in Southeast Asia, Murray Valley encephalitis virus in Australia, and St. Louis encephalitis (SLE) virus in North and South America. The principal vertebrate hosts for these arthropod-borne viruses (arboviruses) are wild birds, and the primary vectors are mosquitoes. Little clinical disease or mortality has been reported previously in wild birds from natural infection with these viruses, although significant morbidity and mortality has occurred in humans and domestic animals. West Nile virus (WNV) previously occurred …

Go to article

The Deer Boom: Discussins On Population Growth And Range Expansion Of The White-Tailed Deer, Kurt C. Vercauteren Aug 2003

The Deer Boom: Discussins On Population Growth And Range Expansion Of The White-Tailed Deer, Kurt C. Vercauteren

United States Department of Agriculture Wildlife Services: Staff Publications

The white-tailed deer (Odocoileus virginianus) is the most common and sought-after North American big game animal. More whitetails are harvested each fall than all other deer species (elk, mule deer, moose, and caribou) combined. Whitetails are popular for two main reasons, 1) their broad distribution, and 2) their abundance. The vast majority of bowhunters live in whitetail range and whitetails have experienced a population boom over the last century. Both in terms of numbers and densities, whitetails are far more abundant now than at any time during our lifetime. That is the keypoint, "during our lifetime." If the …

Go to article

Interview No. 1054, Miguel Ortega Aug 2003

Interview No. 1054, Miguel Ortega

Combined Interviews

Mr. Ortega recalls his childhood in Miacatlán, Morelos, México; he states that when he was twelve years old, he began working with his father in sugar cane fields; additionally, he remembers that he moved to Empalme, Sonora, México in 1957 to secure a bracero contract; he relates the help he received there while waiting to enlist in the program, and the process he encountered at the contracting center; furthermore, he remembers his trip to the United States-México border, and how he was treated at the processing center in El Centro, California; he details how the fumigation process was carried out, …

Go to article

Vegf164-Mediated Inflammation Is Required For Pathological, But Not Physiological, Ischemia-Induced Retinal Neovascularization, Susumu Ishida, Tomohiko Usui, Kenji Yamashiro, Yuichi Kaji, Shiro Amano, Yuichiro Ogura, Tetsuo Hida, Yoshihisa Oguchi, Jayakrishna Ambati, Joan W. Miller, Evangelos S. Gragoudas, Yin-Shan Ng, Patricia A. D'Amore, David T. Shima, Anthony P. Adamis Aug 2003

Vegf164-Mediated Inflammation Is Required For Pathological, But Not Physiological, Ischemia-Induced Retinal Neovascularization, Susumu Ishida, Tomohiko Usui, Kenji Yamashiro, Yuichi Kaji, Shiro Amano, Yuichiro Ogura, Tetsuo Hida, Yoshihisa Oguchi, Jayakrishna Ambati, Joan W. Miller, Evangelos S. Gragoudas, Yin-Shan Ng, Patricia A. D'Amore, David T. Shima, Anthony P. Adamis

Ophthalmology and Visual Science Faculty Publications

Hypoxia-induced VEGF governs both physiological retinal vascular development and pathological retinal neovascularization. In the current paper, the mechanisms of physiological and pathological neovascularization are compared and contrasted. During pathological neovascularization, both the absolute and relative expression levels for VEGF164 increased to a greater degree than during physiological neovascularization. Furthermore, extensive leukocyte adhesion was observed at the leading edge of pathological, but not physiological, neovascularization. When a VEGF164-specific neutralizing aptamer was administered, it potently suppressed the leukocyte adhesion and pathological neovascularization, whereas it had little or no effect on physiological neovascularization. In parallel experiments, genetically altered VEGF164 …

Go to article

A Protocol For Supporting Context Provision In Wireless Mobile Ad Hoc Networks, Christine Julien, Gruia-Catalin Roman Aug 2003

A Protocol For Supporting Context Provision In Wireless Mobile Ad Hoc Networks, Christine Julien, Gruia-Catalin Roman

All Computer Science and Engineering Research

The increasing ubiquity of mobile computing devices has made ad hoc networks everyday occurrences. In these highly dynamic environments, the multitude of devices provides a varied and rapidly changing environment in which applications must learn to operate. Successful end-user applications will not only learn to function in this environment but will take advantage of the variety of information available. Protocols for gathering an application’s contextual information must be built into the network to function in a timely and adaptive fashion. This paper presents a protocol for providing context information to such applications. We present an implementation and show how it …

Go to article

August 2, 2003 (Pages 3719-3980), Pennsylvania Legislative Reference Bureau Aug 2003

August 2, 2003 (Pages 3719-3980), Pennsylvania Legislative Reference Bureau

Volume 33 (2003)

No abstract provided.

Go to article

Influence Of Aluminum Ion On The Anaerobic Treatment Of A Poultry Slaughterhouse Wastewater, Julio Alberto Martinez Aug 2003

Influence Of Aluminum Ion On The Anaerobic Treatment Of A Poultry Slaughterhouse Wastewater, Julio Alberto Martinez

Theses and Dissertations

The influence of Al 3+ on the anaerobic treatment of a poultry slaughterhouse wastewater was studied in this work. The soluble COD (SCOD), volatile acid (VA) concentrations, and methane yield values were measured and compared for zero, 15, and 40 ppm Al 3+ runs. Methane yields of 55.4, 144.2, and 215.4 ml CH4/g. COD for zero, 15, and 40 ppm Al 3+ concentrations, respectively, were observed. Furthermore, SCOD and VAs were not detectable in the reactor that was seeded with 40 ppm Al 3+. It was concluded that inhibitory effects of long chain fatty acids (LCFAs) on aceticlastic methanogens were …

Go to article

Surface Characterization Of Rh-Co, Ru-Co And Pd-Co Bimetallic Catalysts, Sajeev Moorthiyedath Aug 2003

Surface Characterization Of Rh-Co, Ru-Co And Pd-Co Bimetallic Catalysts, Sajeev Moorthiyedath

Theses and Dissertations

Methanation of CO2, a greenhouse gas component, using bimetallic catalysts is considered. Rh, Pd and Ru were combined separately with Co on silica support to form bimetallic catalysts with 5 % metal loading and atomic ratio to Co equal to 1. Pore volume of the silica was measured using physisorption analysis. The unreduced catalyst samples were characterized using XPS, TPR and SEM-EDS. XPS results showed low Rh, Pd, Ru and Co concentrations at the surface for the three bimetallic catalysts. The oxidation states of metals detected by XPS supported the likely presence of metals in their oxide form. Detection of …

Go to article

Solubility Studies On The Na - F - Po4 System In Sodium Nitrate And In Sodium Hydroxide Solutions, Dinesh Kumar Selvaraj Aug 2003

Solubility Studies On The Na - F - Po4 System In Sodium Nitrate And In Sodium Hydroxide Solutions, Dinesh Kumar Selvaraj

Theses and Dissertations

The thesis investigates the solubility of various sodium salts present in the waste tanks at the Hanford nuclear site. The experiments were conducted in different concentrations of caustic and in water at 25°C and 50°C. The results obtained from these studies will be used to improve existing databases for the Environmental Simulation Program (ESP, available from OLI Systems, Inc.), thereby increasing its accuracy in predicting waste behavior under high ionic strength conditions. Experiments were performed on the following systems: 1) NaF - NaNO3 - NaOH, 2) Na3PO4 - NaNO3 - NaOH, 3) NaF - Na3PO4 - 1m NaNO3 - NaOH, …

Go to article

The Design And Evaluation Of A Continuous Photocatalytic Reactor Utilizing Titanium Dioxide In Thin Films Of Mesoporous Silica, Transito Lynne Macias Aug 2003

The Design And Evaluation Of A Continuous Photocatalytic Reactor Utilizing Titanium Dioxide In Thin Films Of Mesoporous Silica, Transito Lynne Macias

Theses and Dissertations

Titanium dioxide (TiO2) is an established photocatalyst utilized for the photo-oxidation of organics in wastewater. Aqueous suspensions of TiO2 require separation and re-suspension steps to be used on an industrial scale. A method of immobilizing TiO2 within the mesoporous structure of silica has been developed at the University of Alabama. The objective of this thesis was to design and evaluate a bench-scale, continuous, photocatalytic reactor utilizing these films. This was accomplished in two phases of work: (1) batch reactions and (2) continuous reactions. The batch reactor was a one-liter standard photochemical reactor from Ace Glass. The continuous photocatalytic reactor designed …

Go to article

University Of Central Florida Commencement, August 2, 2003, University Of Central Florida Aug 2003

University Of Central Florida Commencement, August 2, 2003, University Of Central Florida

Commencement Programs

No abstract provided.

Go to article

Lighter And Heavier, Susan Thorpe Aug 2003

Lighter And Heavier, Susan Thorpe

Word Ways

The weight of a word is determined by assigning A=1, B=2 through Z=26 and adding the letter values together. The density, or average letter value, of a word is found by dividing its weight by the number of letters in the word. Words with a low density are 'lightweight' words; those with a high density are 'heavyweight' words.

Go to article

Kickshaws, David Morice Aug 2003

Kickshaws, David Morice

Word Ways

A collection of linguistic kickshaws.

Go to article

Sports Administration Press Releases 2003-2004, Wofford College. Sports Information Office Aug 2003

Sports Administration Press Releases 2003-2004, Wofford College. Sports Information Office

Sports Press Releases

No abstract provided.

Go to article

First Prev Next Last