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2007

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The Road Also Taken: Lessons From Organic Agriculture For Market- And Risk-Based Regulation, Donald Thomas Hornstein Jan 2007

The Road Also Taken: Lessons From Organic Agriculture For Market- And Risk-Based Regulation, Donald Thomas Hornstein

Faculty Publications

No abstract provided.


Regulating White Desire, Reginald Oh Jan 2007

Regulating White Desire, Reginald Oh

Law Faculty Articles and Essays

This Article contends that segregationist justifications for miscegenation and segregation laws shows that those laws effectively imposed a legal duty on whites to adhere to cultural norms of endogamy. Dominant social groups enforce rules of endogamy⁠—the cultural practice of encouraging people to marry within their own social group⁠—to protect the dominant status of their individual members and of the social group in general. Thus, laws prohibiting interracial marriages regulated white desire in order to protect the dominant status of whites as a group. The Loving Court, therefore, ultimately was correct in declaring that miscegenation laws denied blacks equal protection.

Part …


What Now?: Evaluating Elearning Cpd Practice In Irish Third-Level Education, Roisin Donnelly, K. C. O'Rourke Jan 2007

What Now?: Evaluating Elearning Cpd Practice In Irish Third-Level Education, Roisin Donnelly, K. C. O'Rourke

Journal Articles

The internet has made it impossible for higher education institutions to ignore technology in fulfilling their strategic mission and respond to the expectations of a diverse student body. In the Republic of Ireland, as elsewhere, the use of online technologies has become an increasingly important challenge in academic staff development, and on the surface, eLearning has been moderately successful in the teaching and learning environment. However, given the rapid rate of change in both technology and the increasing diversity in academic staff and students, to describe accurately the nature of eLearning for academic staff development is near impossible. There has …


Increased Mitochondrial Mass In Cells With Functionally Compromised Mitochondria After Exposure To Both Direct Y Radiation And Bystander Factors, Sharon Nugent, Carmel Mothersill, C. Seymour, B. Mcclean, Fiona Lyng, James Murphy Jan 2007

Increased Mitochondrial Mass In Cells With Functionally Compromised Mitochondria After Exposure To Both Direct Y Radiation And Bystander Factors, Sharon Nugent, Carmel Mothersill, C. Seymour, B. Mcclean, Fiona Lyng, James Murphy

Articles

The bystander effect describes radiation-like damage in unirradiated cells either in the vicinity of irradiated cells or exposed to medium from irradiated cells. This study aimed to further characterize the poorly understood mitochondrial response to both direct irradiation and bystander factor(s) in human keratinocytes (HPV-G) and Chinese hamster ovarian cells (CHO-K1). Oxygen consumption rates were determined during periods of state 4, state 3 and uncoupled respiration. Mitochondrial mass was determined using MitoTracker FM. CHO-K1 cells showed significantly reduced oxygen consumption rates 4 h after exposure to 5 Gy direct radiation and irradiated cell conditioned medium (ICCM) and an apparent recovery …


In Vitro Toxicity Evaluation Of Single Walled Carbon Nanotubes On Human A549 Lung Cells, Maria Davoren, Eva Herzog, Alan Casey, Benjamin Cottineau, Gordon Chambers, Hugh Byrne, Fiona Lyng Jan 2007

In Vitro Toxicity Evaluation Of Single Walled Carbon Nanotubes On Human A549 Lung Cells, Maria Davoren, Eva Herzog, Alan Casey, Benjamin Cottineau, Gordon Chambers, Hugh Byrne, Fiona Lyng

Articles

This paper describes the in vitro cytotoxicity assessment of single walled carbon nanotubes (SWCNT) on A549 cells, a human lung cell line. Cellular viability was determined using the alamar blue (AB), neutral red (NR) and MTT assays, which evaluated metabolic, lyso-somal and mitochondrial activity respectively. In addition, the total protein content of the cells was measured using the coomassie bril-liant (CB) blue assay. Supernatants were also assayed for Adenylate Kinase (AK) release and Interleukin 8 (IL-8) which indicated a loss of cell membrane integrity and an in Xammation response respectively.


Vibrational Spectroscopy For Pathology From Biochemical Analysis To Diagnostic Tool, Fiona Lyng, Eoghan O'Faolain, J. Conroy, Aidan Meade, Peter Knief, Brendan Duffy, M. Hunter, J. Byrne, P. Kelehan, Hugh Byrne Jan 2007

Vibrational Spectroscopy For Pathology From Biochemical Analysis To Diagnostic Tool, Fiona Lyng, Eoghan O'Faolain, J. Conroy, Aidan Meade, Peter Knief, Brendan Duffy, M. Hunter, J. Byrne, P. Kelehan, Hugh Byrne

Articles

Cervical cancer is the second most common cancer in women worldwide with 80% of cases arising in the developing world. The mortality associated with cervical cancer can be reduced if this disease is detected at the early stages of development or at the pre-malignant state (cervical intra-epithelial neoplasia, CIN). The aim of this study was to investigate the potential of Raman spectroscopy as a diagnostic tool to detect biochemical changes accompanying cervical cancer progression. Raman spectra were acquired from proteins, nucleic acids, lipids and carbohydrates in order to gain an insight into the biochemical composition of cells and tissues. Spectra …


Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 8 - Fall 2007, Inquiry Editors Jan 2007

Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 8 - Fall 2007, Inquiry Editors

Inquiry: The University of Arkansas Undergraduate Research Journal

No abstract provided.


Business, Steven R. Ratner Jan 2007

Business, Steven R. Ratner

Book Chapters

This chapter seeks to expose some of the divergences between doctrine and reality, and to suggest ways of understanding the field that take proper account of business. It does so first by examining the roles and goals of business entities with respect to international environmental law. It then examines how international law has accommodated the place of business in environmental policy with respect to two key issues: (1) corporations as the target of legal obligations; and (2) corporations as participants in the process of international environmental law, particularly with respect to law-making and implementation. I conclude with some thoughts regarding …


Visual Signatures In The Irish Neolithic Landscape: A Wider Perspective On Irish Passage Tombs, Frank Prendergast Jan 2007

Visual Signatures In The Irish Neolithic Landscape: A Wider Perspective On Irish Passage Tombs, Frank Prendergast

Conference Papers

Arising from archaeoastronomical surveys undertaken as part of continuing doctoral research on Irish passage tombs by the author, extended tomb intervisibility has emerged as a frequent and potentially significant cultural factor, warranting further investigation and analysis. This new data type is discussed in terms of its potential to contribute towards a broader understanding of the motivation and symbolism behind the siting of these Neolithic monuments.


Spatial Ecology, Habitat Selection, And Survival Of Wild Turkey Gobblers In A Managed Bottomland Hardwood Forest, Blake Anthony Grisham Jan 2007

Spatial Ecology, Habitat Selection, And Survival Of Wild Turkey Gobblers In A Managed Bottomland Hardwood Forest, Blake Anthony Grisham

LSU Master's Theses

Wild turkey (Meleagris gallopavo) males were captured and radio-tagged in a bottomland hardwood forest of south-central Louisiana. Turkeys were monitored year round from fixed telemetry stations on Sherburne Wildlife Management Area, Atchafalaya National Wildlife Refuge, and Bayou des Ourses to observe seasonal patterns of space use, habitat selection and survival from 2005-07. The largest seasonal home range was in fall/winter (966.41 ha; Oct 1-Feb 28). Spring home range (767.77 ha; Mar 1- May 31) size was lower than reported in previous studies and was a function of female availability. Season and age interacted to influence core area size (F5/63 …


Book Review: A Creationist Review And Preliminary Analysis Of The History, Geology, Climate, And Biology Of The Galápagos Islands, Timothy R. Brophy Jan 2007

Book Review: A Creationist Review And Preliminary Analysis Of The History, Geology, Climate, And Biology Of The Galápagos Islands, Timothy R. Brophy

Faculty Publications and Presentations

No abstract provided.


Ecophysiological Boundaries For The Distribution Of The Peaks Of Otter Salamander (Plethodon Hubrichti), Anna Fredrickson, Timothy R. Brophy, Norman Reichenbach Jan 2007

Ecophysiological Boundaries For The Distribution Of The Peaks Of Otter Salamander (Plethodon Hubrichti), Anna Fredrickson, Timothy R. Brophy, Norman Reichenbach

Faculty Publications and Presentations

No abstract provided.


Redox Potential Measurement In Aqueous Solutions And Biological Media, Mark M. Goldin, G. J. Blanchard, A. K. Evseev, V. A. Kolesnikov, Yu S. Goldfarb, A. G. Volkov, Mikhail M. Goldin Jan 2007

Redox Potential Measurement In Aqueous Solutions And Biological Media, Mark M. Goldin, G. J. Blanchard, A. K. Evseev, V. A. Kolesnikov, Yu S. Goldfarb, A. G. Volkov, Mikhail M. Goldin

Faculty Publications and Presentations

No abstract provided.


Hospice Nurses, Spiritual Development And A Changing Health Care Paradigm, Amy L. Barr Jan 2007

Hospice Nurses, Spiritual Development And A Changing Health Care Paradigm, Amy L. Barr

Master's Theses and Capstones

Recently researchers have become increasingly interested in how we are going to care for our growing elderly population. Little, however, has been done to examine the personal attitudes toward death, dying and spirituality of the professionals who care for the terminally ill. The purpose of this study is to examine spiritual development among hospice nurses who work in palliative care. Data were obtained using qualitative, in-depth interviews with 20 hospice nurses (4 males, 16 females) from ages 36 to 61. The interviews were conducted at three different hospice organizations located in the northwest, northeast and New England regions of the …


What’S International Law Got To Do With It? Transnational Law And The Intelligence Mission, James E. Baker Jan 2007

What’S International Law Got To Do With It? Transnational Law And The Intelligence Mission, James E. Baker

Georgetown Law Faculty Publications and Other Works

The United States faces an immediate and continuous threat of terrorist attack using weapons of mass destruction, including nuclear weapons. The intelligence function and national security law, including international law--or more accurately transnational law--are central to addressing this threat. Indeed, international law is more relevant today in addressing this threat than it was before September 11. Part II of this article describes a continuum of contemporary threats to U.S. national security, with a focus on nonstate terrorism. Part III addresses the role of intelligence and national security law, and in particular law addressed to process, in combating these threats. Part …


Technological Advancement And International Human Rights: Is Science Improving Human Life Or Perpetuating Human Rights Violations?, Christine A. Khalili-Borna Jan 2007

Technological Advancement And International Human Rights: Is Science Improving Human Life Or Perpetuating Human Rights Violations?, Christine A. Khalili-Borna

Michigan Journal of International Law

This Note assesses the practices of pre-implantation and prenatal genetic screening and sex-determination through an international human rights framework founded in the Universal Declaration of Human Rights (Universal Declaration), the Convention on the Rights of the Child (CRC), and the Convention on the Elimination of All Forms of Discrimination Against Women (CEDAW).


Investigating The Heart Of A Community: Archaeological Excavations At The African Meeting House, Boston, Massachusetts, David B. Landon, Teresa Dujnic, Kate Descoteaux, Susan Jacobucci, Darios Felix, Marisa Patalano, Ryan Kennedy, Diana Gallagher, Ashley Peles, Jonathan Patton, Heather Trigg, Allison Bain, Cheryl Laroche Jan 2007

Investigating The Heart Of A Community: Archaeological Excavations At The African Meeting House, Boston, Massachusetts, David B. Landon, Teresa Dujnic, Kate Descoteaux, Susan Jacobucci, Darios Felix, Marisa Patalano, Ryan Kennedy, Diana Gallagher, Ashley Peles, Jonathan Patton, Heather Trigg, Allison Bain, Cheryl Laroche

Andrew Fiske Memorial Center for Archaeological Research Publications

In collaboration with the Museum of African American History, an archaeological research team from the University of Massachusetts Boston carried out a data recovery excavation at the African Meeting House on Beacon Hill. The African Meeting House was a powerful social institution for 19thcentury Boston’s free black community. The site played an important role in the abolition movement, the creation of educational opportunity, and other community action for social and political equality. The Meeting House was originally built in 1806, and renovations in preparation for the 2006 bi-centennial celebration prompted an investigation of areas of the property to be impacted …


Bridges And Barriers To Developing And Conducting Interdisciplinary Graduate-Student Team Research, Max Nielsen-Pincus, Wayde Cameron Morse, Jo Ellen Force, J. D. Wulfhorst Jan 2007

Bridges And Barriers To Developing And Conducting Interdisciplinary Graduate-Student Team Research, Max Nielsen-Pincus, Wayde Cameron Morse, Jo Ellen Force, J. D. Wulfhorst

Environmental Science and Management Faculty Publications and Presentations

Understanding complex socio-environmental problems requires specialists from multiple disciplines to integrate research efforts. Programs such as the National Science Foundation’s Integrative Graduate Education and Research Traineeship facilitate integrated research efforts and change the way academic institutions train future leaders and scientists. The University of Idaho and the Tropical Agricultural Research and Higher Education Center in Costa Rica collaborate on a joint research program focusing on biodiversity conservation and sustainable production in fragmented landscapes. We first present a spectrum of integration ranging from disciplinary to transdisciplinary across seven aspects of the research process. We then describe our experiences and lessons learned …


Multiple Parents/Multiple Fathers, Nancy E. Dowd Jan 2007

Multiple Parents/Multiple Fathers, Nancy E. Dowd

UF Law Faculty Publications

Multiple parents, especially multiple fathers, are a social reality but not a legal category. The assumption that every child has, or should have, two, but only two, parents remains a core operating assumption of family law. Yet at the same time, our knowledge of the existence of multiple fathers, whether birthfathers, stepfathers, psychological fathers or other categories, has found some reflection in cases that have granted some relational rights to fathers who do not fill the single place allotted for "legal father." In this Article, Professor Dowd proposes that it is time to think not if, but how, to recognize …


Evects Of In Vivo Exposure To Deet On Blood Feeding Behavior And Fecundity In Anopheles Quadrimaculatus (Diptera: Culicidae), Rui-De Xue, Arshad Ali, Donald R. Barnard Jan 2007

Evects Of In Vivo Exposure To Deet On Blood Feeding Behavior And Fecundity In Anopheles Quadrimaculatus (Diptera: Culicidae), Rui-De Xue, Arshad Ali, Donald R. Barnard

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

This study determined the effects of contact with DEET on guinea pig skin on mortality, probing time, blood feeding rate, engorgement time, and fecundity responses in female Anopheles quadrimaculatus Say. Exposure, in this manner, to 10% DEET (in ethanol) for 5min, resulted in 98% mortality in mosquitoes after 24 h. The median probing time (PT50) required by females, when exposed to 0.1%, 1.0%, and 10% DEET, was significantly (P< 0.0001) longer (12.5, 12.1, and 19.1 s, respectively) than the 6.8 s required by females to probe ethanol-treated skin (control). Similarly, mean blood feeding rates in populations of females exposed to 1.0% DEET for ≤5min (14.4%) was 6x lower (P <0.001) (85.5%) than in females exposed to ethanol-treated skin, whereas the mean engorgement time on skin treated with 1.0% DEET (66.3 s) was significantly shorter (P<0.0001) than for females feeding on the control guinea pigs (105.9 s). The mean number of mature oöcytes per female (fecundity) in treatment (1.0% DEET) and control mosquitoes was not significantly different. The responses to DEET observed in this study suggest that repeated exposure of female A. quadrimaculatus populations to this repellent, in laboratory bioassays, could result in confounding of toxicant and repellent effects and inaccurate estimates of DEET repellency.


Fish And Wildlife Benefits Associated With Wetland Establishment Practices, Charles A. Rewa Jan 2007

Fish And Wildlife Benefits Associated With Wetland Establishment Practices, Charles A. Rewa

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Efforts to establish wetlands through restoration and creation actions have increased in recent decades in response to regulatory and voluntary incentive programs. This paper summarizes the findings of studies conducted to document fish and wildlife response to these practices. The majority of published studies describe bird response to wetland restoration, with most reporting bird communities in restored wetlands to be similar to those of natural reference wetlands. Studies also indicate that invertebrates and amphibians generally respond quickly to and colonize newly established wetland habitats. Key factors reported as correlated with wildlife species richness include wetland size, availability of nearby wetlands …


Effect Of Drying On Phosphorus Distribution In Poultry Manure, Heidi W. Dail, Zhongqi He, M. Susan Erich, C. Wayne Honeycutt Jan 2007

Effect Of Drying On Phosphorus Distribution In Poultry Manure, Heidi W. Dail, Zhongqi He, M. Susan Erich, C. Wayne Honeycutt

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Laboratory drying may alter manure phosphorus (P) distribution. The effects of freeze, air (22 °C), and oven (65 °C) drying on sequentially fractioned poultry manure P were examined. Higher drying temperatures resulted in lower percentage of dry matter. Increased H2O- and decreased sodium bicarbonate (NaHCO3)-extractable P with drying provided evidence that drying increases poultry manure P solubility. Labile fractions were predominantly inorganic P (Pi), whereas sodium hydroxide (NaOH) and hydrochloric acid (HCl) fractions had significant amounts of organic P (Po). Drying altered H2O- and NaHCO3-extractable Pi but …


Efficiency Of Gene Silencing In Arabidopsis : Direct Inverted Repeats Vs. Transitive Rnai Vectors, Sergei A. Filichkin, Stephen P. Difazio, Amy M. Brunner, John M. Davis, Zamin K. Yang, Udaya C. Kalluri, R. S. Arias, Elizabeth Etherington, Gerald A. Tuskan, Steven H. Strauss Jan 2007

Efficiency Of Gene Silencing In Arabidopsis : Direct Inverted Repeats Vs. Transitive Rnai Vectors, Sergei A. Filichkin, Stephen P. Difazio, Amy M. Brunner, John M. Davis, Zamin K. Yang, Udaya C. Kalluri, R. S. Arias, Elizabeth Etherington, Gerald A. Tuskan, Steven H. Strauss

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

We investigated the efficiency of RNA interference (RNAi) in Arabidopsis using transitive and homologous inverted repeat (hIR) vectors. hIR constructs carry self-complementary intron-spliced fragments of the target gene whereas transitive vectors have the target sequence fragment adjacent to an intron-spliced, inverted repeat of heterologous origin. Both transitive and hIR constructs facilitated specific and heritable silencing in the three genes studied (AP1 , ETTIN and TTG1). Both types of vectors produced a phenotypic series that phenocopied reduction of function mutants for the respective target gene. The hIR yielded up to fourfold higher proportions of events with strongly manifested reduction …


Pollination Biology Of A Disjunct Population Of The Endangered Sandhills Endemic Penstemon Haydenii S. Wats. (Scrophulariaceae) In Wyoming, Usa, V. J. Tepedino, T. L. Griswold, T.R. Toler, B. A. Bradley, J. L. Hawk Jan 2007

Pollination Biology Of A Disjunct Population Of The Endangered Sandhills Endemic Penstemon Haydenii S. Wats. (Scrophulariaceae) In Wyoming, Usa, V. J. Tepedino, T. L. Griswold, T.R. Toler, B. A. Bradley, J. L. Hawk

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

We studied the breeding system and flower visitors of the endangered plant, Penstemon haydenii, at several south-central Wyoming, USA occurrences. In agreement with earlier studies of the species 300 km to the east in Nebraska, we found Wyoming plants to be self-incompatible and pollinator-dependent for sexual reproduction. Flower visitors were several species of native bees in the families Apidae (particularly bumblebees), Halictidae (small sweat bees), and Megachilidae (especially in the genus Osmia); and the masarid wasp Pseudomasaris vespoides. Especially important was Osmia brevis, an abundant megachilid bee, and one of only two species (the sweat bee …


Growth And Pubertal Development Of F1 Bulls From Hereford, Angus, Norwegian Red, Swedish Red And White, Friesian, And Wagyu Sires, E. Casas, D. Lunstra, Larry V. Cundiff, Johny Joe Ford Jan 2007

Growth And Pubertal Development Of F1 Bulls From Hereford, Angus, Norwegian Red, Swedish Red And White, Friesian, And Wagyu Sires, E. Casas, D. Lunstra, Larry V. Cundiff, Johny Joe Ford

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The objective of the study was to characterize body growth, testicular development, and puberty from 8 to 14 mo of age in bulls (n = 120) produced by mating sires from Hereford, Angus, Norwegian Red, Swedish Red and White, Friesian, and Wagyu breeds to MARC III (¹⁄₄ Hereford, ¹⁄₄ Angus, ¹⁄₄ Red Poll, and ¹⁄₄ Pinzgauer) cows. Traits evaluated were birth weight, weaning weight (at 215 d), yearling weight, ADG from 8 to 14 mo of age, paired testicular volume growth from 8 to 14 mo of age, age at puberty (determined by production of 50 × 106 sperm …


Mitigation Of Shallow Groundwater Nitrate In A Poorly Drained Riparian Area And Adjacent Cropland, Jennifer H. Davis, Stephen M. Griffith, William R. Horwath, Jeffrey J. Steiner, David D. Myrold Jan 2007

Mitigation Of Shallow Groundwater Nitrate In A Poorly Drained Riparian Area And Adjacent Cropland, Jennifer H. Davis, Stephen M. Griffith, William R. Horwath, Jeffrey J. Steiner, David D. Myrold

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Riparian ecosystems, through their unique position in the agricultural landscape and ability to influence nutrient cycles, can potentially reduce NO3 loading to surface and ground waters. The purpose of this study was to determine the fate of NO3 in shallow groundwater moving along a lateral flowpath from a grass seed cropping system through an undisturbed mixed-species herbaceous riparian area. Soil A (30–45 cm) and C horizon (135–150 cm) NO3, dissolved oxygen, and nitrous oxide concentrations were significantly higher in the cropping system than the adjacent riparian area. Nitrate concentrations in both horizons of the riparian soil …


The Original Usda-Ars Experimental Watersheds In Texas And Ohio: Contributions From The Past And Visions For The Future, R. D. Harmel, J. V. Bonta, C. W. Richardson Jan 2007

The Original Usda-Ars Experimental Watersheds In Texas And Ohio: Contributions From The Past And Visions For The Future, R. D. Harmel, J. V. Bonta, C. W. Richardson

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The USDA Soil Conservation Service (USDA‐SCS) realized the importance of understanding hydrologic processes on agricultural fields and watersheds in the mid‐1930s. Based on this realization, the research program of the Hydrologic Division of SCS established three experimental watersheds across the U.S. to analyze the impact of landuse practices on soil erosion, flood events, water resources, and the agricultural economy. Two of the original watersheds remain in operation today within the USDA Agricultural Research Service (USDA‐ARS): the Blacklands Experimental Watershed (now the Grassland, Soil and Water Research Laboratory) near Riesel, Texas, and the North Appalachian Experimental Watershed near Coshocton, Ohio. These …


Dry Weight And Nitrogen Content Of Chickpea And Winter Wheat Grown In Pots For Three Rotations, James E. Bidlack, Charles T. Mackown, Srinivas C. Rao Jan 2007

Dry Weight And Nitrogen Content Of Chickpea And Winter Wheat Grown In Pots For Three Rotations, James E. Bidlack, Charles T. Mackown, Srinivas C. Rao

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Chickpea [Cicer arietinum (L.)] cultivars ‘ICCV-2’ and ‘Sarah’ were studied along with a control, multistrain, TAL 1148, and TAL 480 Bradyrhizobium strains to determine the effect(s) of cultivar and inoculum on dry weight (DW) and nitrogen (N) content of the legume, as well as soil mineral N, DW, and N content of wheat [Triticum aestivum (L.) emend. Thell.] in a continuous wheat-legume rotation. Chickpeas were planted during the summer and harvested in the fall of 1992, 1993, and 1994. Vegetative growth from chickpeas was incorporated into the soil prior to wheat planting, and soil cores were taken at …


Comparison Of Ground-Based Remote Sensors For Evaluation Of Corn Biomass Affected By Nitrogen Stress, Soon-Dal Hong, James Schepers, Dennis D. Francis, Michael R. Schlemmer Jan 2007

Comparison Of Ground-Based Remote Sensors For Evaluation Of Corn Biomass Affected By Nitrogen Stress, Soon-Dal Hong, James Schepers, Dennis D. Francis, Michael R. Schlemmer

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The nondestructive determination of plant biomass is not possible; however, crop-canopy sensors that determine the normalized difference vegetation index have the potential to estimate living biomass, which is indicative of plant vigor and stress. Pot experiments using sand culture were conducted in 2002 and 2003 under greenhouse conditions to evaluate the effect of nitrogen (N) deficiency on corn biomass and reflectance. Stress was imposed by implementing six to eight levels of N in Hoagland’s nutrient solution. Canopy reflectance measurements made at three growth stages with a variety of handheld spectral sensors (active and passive) were closely correlated with dry weight …


Design And Testing Of A Closed, Stirring Respirometer For Measuring Oxygen Consumption Of Channel Catfish Eggs, Eugene L. Torrans Jan 2007

Design And Testing Of A Closed, Stirring Respirometer For Measuring Oxygen Consumption Of Channel Catfish Eggs, Eugene L. Torrans

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A closed, stirring respirometer was designed to agitate small egg mass samples of channel catfish Ictalurus punctatus while measuring oxygen consumption by the eggs. Egg mass samples ranging in size from 15 to 46 g were placed on a screen platform above a magnetic stir bar in the respirometer; the degree of agitation was controlled with a magnetic stir plate. Dissolved oxygen (DO) concentration and temperature were measured with a luminescent DO sensor and meter. The respirometer was used to determine routine metabolic rate and limiting oxygen concentration (the presumed hypometabolic transition zone) on egg mass samples from 10 different …