Digital Commons Network^™

Stolon Growth And Its Morphological Components In White Clover (Trifolium Repens L.) Cultivars, Omar Scheneiter, E. M. Pagano

IGC Proceedings (1977-2023)

A trial was performed to study the seasonal changes in stolon growth and its morphological components in four white clover cultivars, in the north of Buenos Aires Province, in Argentina. Stolons were tagged in four seasonal measurements periods per year, during two consecutive years. Leaf, stolon and flowerheads weights were recorded at regular intervals in each measurement period and total stolon growth was calculated. Differences among cultivars were found in stolon growth and its morphological components in most of the measurement periods. In spring and summer, differences among cultivars in stolon growth were related to flowering quantity and earliness, and …

Dry Matter Production Of Shoots And Root Density Of Two Cultivars Of Lablab Purpureus (L.) Sweet, L. R. De A. Rodrigues, T. J. D. Rodrigues, A. K. B. Ramos, D. G. De Quadros

IGC Proceedings (1977-2023)

This experiment was conducted in green house conditions to evaluate the DM accumulation in the shoots and in the roots of two cultivars of Lablab purpureus (L.) Sweet. A 2x3 factorial (two cultivars and three evaluation dates) was conducted according to a randomized complete block design with four replications, being the cultivars Highworth and Rongai evaluated at 42, 56, and 70 days after seedling emergence (DASE). The results indicated that the cvs. Highworth and Rongai have the same pattern of DM accumulation in the shoots. In the upper layer of the soil (0-0.20 m) it was found 38.83% and 43.64% …

Yellow-Flowered Lucerne (Medicago Falcata L.) - A Potential Forage Legume For The North, T. Mela, H. Ihamäki, M. Matilainen

IGC Proceedings (1977-2023)

The suitability of yellow-flowered lucerne (Medicago falcata L.) for forage production under the northern conditions was studied in a mixture sward with timothy (Phleum pratense L.) in field trials in South Finland for four years from 1995 to 1998. Through the first three winters lucerne stayed unharmed. In June and July lucerne grew vigorously, but in August little. The total seasonal yields were highest in the second and the third year of harvesting, up to 10 t DM ha^-1. In the winter 1997-1998 , winter damages killed 21 to 38 % of lucerne plants, and resulted …

Role Of White Clover In The Improvement Of Economical Efficiency Of Feeds From Grasslands, P. Goliñski

IGC Proceedings (1977-2023)

The aim of the research was to analyse the role played by white clover in the improvement of economical efficiency of feeds obtained from permanent grasslands. The influence of the proportion of white clover in the pasture sward on unit production costs of yield, energy and crude protein and the profit threshold in milk production was analysed taking into account three white clover cultivars, nitrogen fertilisation, irrigation and overdrilling. The investigation procedures employed the author’s own calculation models elaborated in optimisation programs based on production conditions found in dairy farms in the region of Wielkopolska. It was proved that the …

Solar Energetic Particles And Galactic Cosmic Rays, Connor Smith, Samuel Lutzel

Student Research Symposium (SRS)

Ionizing radiation is harmful to biological organisms and technological systems. In space, this radiation can have both solar and galactic origins. Solar energetic particles (SEPs) include protons, electrons, and HZE ions. HZE stands for High(H), atomic number (Z), and Energy (E). HZE ions are also components of the Galactic Cosmic Rays (GCRs) and are the most harmful type of radiation that astronauts face. The goal of this project is to study the number density of each component of the SEPs and GCRs during different phases of the solar cycle. In other words, what are the fluxes of electrons and HZE …

Understanding The Electrophysiological Changes In Microgravity And Radiation Exposed Bacteria Using Dielectrophoresis And Impedance Methods, John J. Veracka

Student Research Symposium (SRS)

Radiation and Microgravity are extreme space conditions where certain micro-organisms have been able to survive. These conditions can cause the up-regulation of radiation-induced DNA repair processes due to the production of reactive oxidative species (ROS) and reactive nitrogen species (RNS). The proposed project seeks to understand the changes in the electrophysiological properties, such as permittivity and conductivity of the cell membrane, on the internal components of the model bacteria E. coli K-12, by utilizing techniques known as impedance methods and Dielectrophoresis (DEP). The DEP force will be produced by an optimum Alternating current (AC) voltage and a given frequency passing …

Effects Of Microgravity On Mutualistic Bacteria, Mitchell K. Villafania

Student Research Symposium (SRS)

Changes in environmental conditions represent a challenge for all terrestrial organisms, including the organisms involved in mutualistic associations (when both organisms obtain a benefit from each other). Changes in environment might include fluctuations in in gravity and microgravity which represents a new frontier for space biology research. In this study we utilized Vibrio fischeri, a beneficial symbiotic bacterium of squids and monocentrid fishes. First, Vibrio fischeri was grown under gravity and microgravity conditions using a 2D clinostat design, after 24 and 48 hours of growth, we examined crucial phenotypic changes that might affect bacterial physiology and phenotypic changes involved in …

Biology Research Experience At The Erau’S Space Microbiology Laboratory, Erik Larsen, Bailey Burden, Jakob Robertson, Hugo Castillo

Student Research Symposium (SRS)

The Aerospace Physiology program has created opportunities for students to not only get an education on the biological effects of flight and space, but also to be trained in advanced research techniques using state-of-the-art equipment. The Space Microbiology Lab studies how “space” conditions regulate microbial physiology and gene expression using microgravity analogs and low activity radiation sources to simulate what space might feel like for bacteria that inhabit spacecraft components and humans. We have performed several experiments with Escherichia coli, Arthrospira platensis, Candida albicans, and Candida parasilopsis (isolated from a space station module and provided to the lab by NASA) …

Biological Validation Of A Microgravity Analog For Bacteria And Cell Cultures, Collin R. Topolski, Hugo Castillo, Eduardo Divo

Student Research Symposium (SRS)

With the future of long duration spaceflight missions looking to expand from the International Space Station (ISS) to deep space, it must be ensured that all critical systems, living and non-living, are thoroughly developed before humans begin the extended voyage. As we continue to unravel the effects of microgravity on cells, more questions arise on the molecular and cellular components and processes that sense and react to lowered gravity conditions. We have developed a microgravity analog that could simulate the effects of reduced gravity on cells and that could be maintained for a period of time long enough to observe …

Image-Based Microbiome Profiling Differentiates Gut Microbial Metabolic States, Sarwesh Rauniyar

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

A Neutral Model Of 100 Million Years Of Chromosome Inversions In The Yeast Genus Lachancea, Brian Clark

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

An Extension Of Euler's Polyhedron Theorem, Joy Marie D'Andrea

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Effect Of Human Behavior On The Evolution Of Viral Strains During An Epidemic, Asma Azizi

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Allee Effects Plus Noise Induce Population Dynamics Resembling Binary Markov Highs And Lows, Luis F. Gordillo

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

An Agent-Based Model Of Pain-Related Neurons In The Amygdala, Rachael Miller Neilan, Benedict Kolber

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Machine Learning-Based Risk Factor Analysis And Prevalence Prediction Of Intestinal Parasitic Infections, Ahmet Ay

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

A Comparison Between The Effects Of Empirical And Theoretical Knockouts On The Structure Of Social Networks, Karina Marie Morales, Christopher Stieha

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Topology And Ecology: Deducing States Of The Upper Mississippi River System, Killian Davis

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

The Use Of Cafeteria Trials For The Selection Of Desmodium Ovalifolium Genotypes, Axel Schmidt, R. Schultze-Kraft, B. L. Maass, C. E. Lascano

IGC Proceedings (1977-2023)

For the selection of tropical legumes which contain anti-nutritive components such as tannins, relative acceptability of genotypes to ruminants is of particular importance, since these plant components may influence selective grazing behaviour and subsequent animal productivity. Plant-animal interactions are not predictable from laboratory analyses. Involving grazing animals through the conduction of relative-acceptability (=cafeteria) trials at early stages of the germplasm selection process might therefore provide a convenient tool to adjust and confirm genotype selection based on laboratory quality analyses data. As part of a multilocational germplasm evaluation project, cafeteria-experiments were conducted at two contrasting environments in Colombia with a core …

Stolon Mass And Classes In White Clover (Trifolium Repens L.) With Two Soil Water Availability Levels, Omar Scheneiter, E. M. Pagano

IGC Proceedings (1977-2023)

Two trials were carried out to study the stolon mass and classes in white clover (Trifolium repens L.) under two soil water availability levels in summer. In each trial, treatments were two white clover cultivars. From December 15^th to February 15^th in 1993/94 and again during the same period the following year, white clover was grown under 30 to 70 % (Forced water uptake) or 85-to100 % (Maximum water uptake) of field capacity. Every two months, throughout two years, total stolon mass, and buried, superficial, and aerial stolons were measured. Differences between cultivars were detected in stolon …

Morphological Description Of Selected Pigeonpea (Cajanus Cajan (L.) Millsp.) Lines, Rodolfo Godoy, F. H. De Souza

IGC Proceedings (1977-2023)

Seventeen pigeonpea pure line accessions selected for desirable forage traits and three commercial cultivars were described according to morphological characters. The following descriptors were used: growth habit, plant height, number of primary and secondary branches, stem color and thickness, leaf shape and hairiness, flower base and second color, pattern of flower streaks, flowering pattern, immature and mature pod color, pod form and hairiness, seed color pattern, base and second seed color, seed eye (region around hilum) color and seed shape and width. Each individual line and cultivar was satisfactorily distinguished from the others by the chosen characters.

Improvement Of Rose Clover Winter Forage Production, Gerald R. Smith, F. M. Rouquette Jr.

IGC Proceedings (1977-2023)

Rose clover (Trifolium hirtum All.) is a winter annual forage legume that has potential for increased use in the U.S. southern region. New cultivars of rose clover are needed with the combination of cold tolerance, winter forage production and full bloom date of late April. Crosses were made between two early flowering cultivars and one late flowering rose clover cultivar. The F₂ and F₃ generations from these crosses were evaluated in northeast Texas for winter growth, cold damage and date of flowering. Fourteen F₃ lines, out of 37 selected F2 parents, showed large increases (>100%) …

Article Iii And The Political Question Doctrine, Scott Dodson

Northwestern University Law Review

Courts and commentators have often sourced the political question doctrine in Article III, a repository of other separation-of-powers doctrines applicable to the federal courts. Rucho v. Common Cause, a blockbuster political question case decided in 2019, explicitly tied the doctrine to Article III. But the historical development of the doctrine undermines the depth of that connection. Further, sourcing the doctrine in Article III leads to some very odd effects, including leaving state courts free to answer federal political questions. This Article argues that the source of the political question doctrine is in substantive law, not in Article III. Such …

Three Essays In Development And Environmental Economics, Michael Benjamin Goodwin

Economics ETDs

This dissertation explores three unique topics in development and environmental economics. The first paper looks at the value people place on clean air in Mexico City using an alternative air pollution measure to the typical ground measurement. Research and policy addressing air pollution remains hampered by a lack of ground level air quality data. This study attempts to overcome this issue using aerosol optical depth from satellite imagery as a proxy for air pollution. Using a hedonic framework and least squares estimation, results show that Mexico City residents place a significant value on clean air as demonstrated by their choices …

Improving The Deployment Of Insecticidal Seed Treatments In Louisiana Rice In Accordance With Integrated Pest Management, Megan Marie Mulcahy

LSU Doctoral Dissertations

Lissorhoptrus oryzophilus Kuschel (Coleoptera: Curculionidae), is the most destructive insect pest of rice in the United States. Lissorhoptrus oryzophilus larvae feed on rice roots, reducing yields by up to 25 %. Lepidopteran stem borers, in the family Crambidae, are also economically important pests of rice in Louisiana.

Currently, insecticidal seed treatments are used throughout the U.S. Mid-south rice industry to prophylactically control L. oryzophilus. Chlorantraniliprole seed treatments are also effective against stem borers. Thus, insecticidal seed treatments are used on >80 % of Louisiana rice acreage. Although seed treatments reduce damage inflicted by these pests, they are applied preventatively …

How Within-Host Priority Effects Between Specialist And Generalist Pathogens Affect Disease Risk, Jing Jiao, Michael H. Cortez

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Ecological Dynamics On Large Metapopulation Graphs, Daniel Cooney

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Hierarchy Establishment From Nonlinear Social Interactionsand Metabolic Costs: An Application To The Harpegnathos Saltator, Jordy Cevallos-Chavez, Carlos Bustamante Orellana, Yun Kang

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Using Integral Projection Models To Study Silver Carp Management Practices, Cameron Coles

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Various Notions Of Canalization – A Review, Claus Kadelka

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.