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Ammonium Chemotaxis In Chlamydomonas Reinhardtii, Gabela Nelson

LSU Doctoral Dissertations

Analysis of ammonium chemotaxis in Chlamydomonas reinhardtii is largely hindered, compared to that of phototaxis, despite equal importance on flagellated microalgal physiology. A major contribution of this shortfall is the lack of proper assay method. We developed a simple Petri dish assay method in which light is homogenously exposed while patterns of the cellular migration are tracked with a function of time. Using the method, new findings were revealed. First, this research presented that a strain lacking the eyespot organelle required for light gradient-sensing exhibits similar chemotactic behavior compared to a wild-type strain, suggesting Chlamydomonas sense an ammonium gradient not …

Development Of Novel Analytical Methods For The Investigation Of Mammalian Tissues And Cells, Grace A. Binder

USF Tampa Graduate Theses and Dissertations

This dissertation endeavors to advance the frontiers of analytical chemistry by addressing critical challenges across three distinct chapters. In the first chapter, the focus is on the evaluation of digestion methods for the analysis of trace metals in mammalian tissues and the Standard Reference Material NIST 1577c. The primary goal is to optimize methodologies, laying the groundwork for reliable trace metal analysis and furthering our understanding of their roles in biological systems.

Transitioning into the realm of immunomodulation, the second chapter elucidates immune response, disease and treatment through the optimization and discovery of STING modulators, utilizing the luciferase assay for …

Natural Products In Food And Agriculture, Stephen O. Duke

Oxford ICSB

Before the National Center for Natural Products Research (NCNPR) existed, I was Director of a USDA weed management lab. Two of my interests were natural products as herbicides and the chemical ecology of weed/crop interactions (allelopathy). Dr. James McChesney and I had several conversations about his vision for the NCNPR on the University of Mississippi campus. I was very interested in becoming a part of this, as his plan was to have a USDA lab that would study natural products for use in food and agriculture as part of the center. The USDA Agricultural Research Service established the Natural Product …

Chemistry, Biology, And Safety Of Volatile Organics From Aromatic And Medicinal Plants, Nicole Stevens

Oxford ICSB

Introduction Sleep is an important foundation of health, yet the U.S. Centers for Disease Control (CDC) notes that about 30% of adults to not get the recommended minimum of 7 hours’ sleep per night. Prescription treatments may help, but they carry risks such as side-effects, dependency, and medication interaction. Natural botanical extracts are a therapeutic possibility for improving sleep quality, but additional research is needed on their efficacy and safety. A system of natural products based on lavender was developed and tested in a human clinical study to evaluate effect on sleep, blood and safety markers, and gene expression modulation …

A Survey Of Melatonin In Dietary Supplement Products Sold In The U.S., Rahul Pawar

Oxford ICSB

In the United States, melatonin products are widely available to consumers as dietary supplements. During the past few decades, melatonin products have gained increased popularity primarily as a sleep aid, with a variety of product forms available for different age groups of consumers. Recent reports have highlighted a rise in melatonin ingestion among children reported to poison control centers across the U.S. The increased use of melatonin-containing dietary supplements and reported deviation from labeled quantities has emphasized the need for additional research to better understand products in the marketplace.
The objective of this work was to measure the melatonin content …

Informing Modifications To Social Participation And Navigation (Span) For Adolescents With Social Anxiety Incorporating Pet Dogs, Nicole Porter, Gary Bedell, Jason Getzler, Megan Mueller

The Open Journal of Occupational Therapy

Background: Social anxiety is one of the most prevalent mental health challenges of adolescence and profoundly impacts social participation. This study obtained adolescent and parent feedback to inform a future modification of Social Navigation and Participation (SPAN) for use with adolescents with social anxiety incorporating pet dogs.

Methods: The study had two phases: Phase 1 included interviews with adolescents with social anxiety (n = 8) about their social participation experiences, strategies, pet dogs, and thoughts on a proposed intervention to promote social participation; and Phase 2 included on-line survey completed by the adolescents and their parents (n = 14) assessing …

Ai Propulsion Of Globalization, Aleksandra Drozd

Liberty University Research Week

The invention and continual growth of artificial intelligence (AI) on the global stage have significantly shaped the world’s economies, governments, societies and their cultures. The new industrial revolution and the subsequent race of the world’s leading powers have led to increased international joint efforts and exchange of information, simultaneously reducing barriers to trade and communication. Meanwhile, emerging technologies deploying AI have driven changes in human behavior and culture, and challenged the traditional nation-state model. Within the same time frame, the world stage has undergone profound transformations with a clear trend of globalization, the tightening of international relations and closer cooperation …

Museum Exhibition Project: Hands Of Extinction, Katy Fulkerson

Liberty University Research Week

Problem Statement The research problem stated that I was to conceptualize an original museum exhibition and create promotional materials, mock displays of the exhibit, and utilize environmental graphic principles. First, I had to determine the topic, then name and visual identity, and finally I took those elements and created both display spaces and additional promotional materials. I was required to create mockups of two main exhibit walls, an entrance wall, one outdoors advertisement, and design a custom handout. Since this was a project mostly devoted to environmental design, most of the designs were made with intention of connecting with its …

Sensory Rooms, Adonai Brown

Liberty University Research Week

What makes up a sensory room? Sensory rooms were created for people with sensory issues (primarily found in the autistic community.) The rooms have since proved to help not only people with disabilities, but a wide range of people who simply enter the room for any amount of time. Sensory issues can range from being under- responsive (hyposensitivity), over- responsive (hypersensitivity), or craving (sensory seeking). Our recommendation for design is to create a nature, wilderness environment using mountains, forest trees, and stargazing. It would also be beneficial to have thermal control elements. Along with that, we also propose that there …

Teaching Citation Politics Through Literature Review Topographies: Towards Cultivating Relational Writing Practices, Mairi Mcdermott

Feminist Pedagogy

Feminism teaches how power works and circulates through our often-unquestioned everyday practices. Since becoming a professor, I have committed myself to this feminist teaching by demystifying--and reimagining--habituated practices, relations, and expectations in higher education that produce and are produced through cis-hetero-patriarchal capitalist White supremacy. Since literature reviews and citation practices are core materials scholars work with, I invite doctoral students to consider different ways these materials can be engaged in efforts to craft transgressive knowledges and worlds through our research. In this article, I describe an assignment designed to disrupt hegemonic patriarchal inheritances in the conventions of writing literature reviews …

Atlantis At War, Aunna Leach

Liberty University Research Week

Research Problem Statement The research problem of my project was to create an engaging and entertaining story that was modeled and created using 3ds max. This goal comes with multiple problems to overcome. First I had to brainstorm and come up with an engaging plot, characters and background. When first creating a 3 dimensional character it is always helpful to have a blueprint to start with, then you can create using 2 dimensional planes, and after you have finished building the 3d character, then you need to rig, skin and build the world around them to make the characters world …

Good Things Take Time, Aunna Leach

Liberty University Research Week

Research Problem Statement The research problem of my project was to create an animated video using real images and mix realistic with 2d cartoon animation to make it relatable. The problems that I ran into were learning the Photoshop animation software, and creating an engaging and clear story plot that had a Christ-centered message. Communication Objective My communication objective was to show the viewer that even though everyone goes through difficult and painful things in life, God always has a plan and will use those painful things for our good. I also wanted to communicate a clear and flawless story …

Animals In Occupations, Cassandra Poorman

Liberty University Research Week

For this printmaking series I wanted to depict various animals in everyday jobs that humans may have. Rather than illustrating the piece, I wanted to utilize the printmaking techniques I learned to create a unique and whimsical work of art. My question became, what printmaking techniques could I combine to give me the most interesting and effective design possible? I knew I wanted to utilize pops of color in my piece, but to do that, I would need to use two printmaking blocks for each animal. I began by researching how other artists utilize two blocks to create multiblock pieces. …

Schedule & Program Booklet, English Department, Kutztown University

KUCC -- Kutztown University Composition Conference

The program for the 2024 Kutztown University Composition Conference.

Influence Of Low-Level Condensed Tannins Concentrations In Temperate Forages On Sheep Performace, F Montossi, F Liu, J Hodgson, S T. Morris, T N. Barry, D F. Risso

IGC Proceedings (1977-2023)

Results from a series of six comparative lamb grazing trials with temperate forages are summarised, and compared with results from the literature. Condensed tannin (CT) concentrations in the diet ranged from 0.12% to 0.47% on a dry matter (DM) basis. Values were generally similar for Yorkshire fog (Holcus lanatus), perennial ryegrass (Lolium perenne) and annual ryegrass (L. multiflorum), each grown with white clover (Trifolium repens), in similar circumstances. Concentrations for tall fescue (Festuca arundinacea)/white clover pastures were relatively low, but may have been artefacts. Drenching with polyethylene glycol (PEG) to bind …

Tannin Contents Of Some Indigenous Browse Plants Of Botswana, A A. Aganga, C M. Tsopito, K M. Morake

IGC Proceedings (1977-2023)

A study was carried out to evaluate the tannin content and crude protein degradation of leaves and twigs from indigenous browsable trees which provide feed for grazing livestock on natural rangelands of Botswana. These browses include the families Leguminosae (Acacias), Capparidaceae (Boscias), Combretaceae (Combretum) and Tiliaceae (Grewias). These were found to be of good nutritive value, with the leaves having a high content of crude protein (9 - 16%) and a wide range of dry matter digestibility (37 - 69.82%). The correlation between crude protein disappearance and tannin content was found to be negative (-0.582) and significant (P<0.05).

Effect Of Tannin In Animal Diet On Nitrification Rate Of Pasture Soil Under Dung Patches, J R. Crush

IGC Proceedings (1977-2023)

The rate of formation of nitrate and ammonium in the soil under dung patches was compared for dung from animals fed either ryegrass (Lolium perenne)/white clover (Trifolium repens) or ryegrass/Lotus pedunculatus forage. Tannin derived from the Lotus did not inhibit ammonification in the soil under dung but nitrate formation was strongly inhibited. The results support the theory that polyphenolics may bind to nitrite in acid soils and cause immobilisation of mineral nitrogen. Apart from their effect of reducing the proportion of dietary nitrogen excreted in urine, tannins in animal diets may make a further contribution to …

Condensed Tannins In Tropical Legumes: Concentration, Astringency And Effects On The Nutrition Of Ruminants, R Barahona, C E. Lascano, R C. Cochran, J L. Morrill, E C. Titgemeyer

IGC Proceedings (1977-2023)

A feeding trial was carried out to determine the effect of extractable condensed tannins (ECT) concentration and tannin astringency in tropical legumes on nitrogen (N) digestion by sheep. Test legumes were Desmodium ovalifolium (Do) and Flemingia macrophylla (Fm) which had similar concentrations of Extractable CT (9% DM) but tannins with different degree of astringency (Do, 0.6 and Fm, 0.3 g protein bound/g of ECT). Chopped sun-dried forage of each legume was sprayed with either water (control) or polyethylene glycol (PEG, 3.5% DM) to reduce ECT and fed to 8 sheep with ruminal and duodenal canulas arranged in a replicated 4 …

Effect Of Condensed Tannin In Lotus Corniculatus And Lotus Pedunculatus On Digestion Of Rubisco In The Rumen, W C. Mcnabb, R J. Aerts, A Brand, J S. Peters, Y L. Foo, G C. Waghorn

IGC Proceedings (1977-2023)

The in vitro precipitation of ribulose-1,5-bisphosphate carboxylase (Rubisco) by condensed tannin (CT) extracted from Lotus corniculatus and Lotus pedunculatus and the effect of these CT on the in vitro rumen degradation of Rubisco was used to compare the reactivity of these CT. The chemical structure of CT from Lotus corniculatus was homogenous with epicatechin stereochemistry and mostly procyanidin units. The CT from Lotus pedunculatus was heterogenous with mostly prodelphinidin units. The amount of CT required to precipitate all the Rubisco when total soluble leaf protein was incubated with CT from Lotus corniculatus and Lotus pedunculatus was similar. Although CT from …

Nitrogen And Fiber Digestion In Sheep Fed Fresh-Frozen And Field-Dried High And Low Tannin Sericea Lespedeza, T H. Terrill, W R. Windham, C S. Hoveland, H E. Amos, B Kouakou, S Gelaye

IGC Proceedings (1977-2023)

Field-drying reduces extractable condensed tannin (CT) of sericea lespedeza [Lespedeza cuneata (Dum-Cours) G. Don], but effects on specific bound and unbound forms of CT and the relationship to protein and fiber digestion in ruminants are unclear. Intake and digestibility of fresh-frozen and field-dried high- and low-tannin sericea were investigated in a feeding trial with sheep (Ovis spp.). Field-drying had no effect on crude protein (CP) and fiber content of sericea, but shifted CT from extractable to bound forms. Digestion coefficients for CP, neutral detergent fiber (NDF), and acid detergent fiber (ADF) were lower for high-tannin sericea than the low-tannin …

Alteration Of Condensed Tannin Sythesis In Transgenic Forage Legumes, F Paolocci, G Tanner, S Arcioni, F Damiani

IGC Proceedings (1977-2023)

The transformation of Lotus corniculatus plants with the maize gene Sn, reorganizes the tissue specificity of condensed tannins accumulation. In particular the transformed plants show an increase of tannin content in roots and a decrease in leaves. Molecular and enzymatic analyses suggest that the transgene can functionally substitute an endogenous unknown gene not expressed in roots and induces its silencing when it is expressed. These findings could have applications for reducing tannin content in unpalatable plants and for cloning genes involved in tannin synthesis.

Comparison Of The In Vitro Fermentation Characteristic Of Fractionated Alfalfa And Sainfoin, L R. Mcmahon, M Goto, T A. Mcallister, G A. Jones, K J. Cheng

IGC Proceedings (1977-2023)

Alfalfa and sainfoin leaves were lyophilized and ground (A, S, respectively) or were fractionated into soluble (A_SOL, S_SOL) and insoluble (A_INS, S_INS)components and lyophilized and incubated in vitro with diluted ruminal fluid for 24h. Whole leaf and soluble fractions were also incubated with polyethylene glycol 8000 (PEG). Gas production (GP), ammonia concentration [NH3] and volatile fatty acid (VFA) production were lower (P< 0.05) from S and SSOL than from A and ASOL Insoluble fractions differed only in [NH3] (SINS < AINS, P < 0.05). Inclusion of PEG increased (P < 0.05) GP, [NH3] and VFA production from whole leaf and soluble fractions of sainfoin, but not alfalfa. Inactivating the condensed tannins in sainfoin with PEG overcame differences in degradability between these two forages.

Differences In Chemical Composition Among Provenances Of Tree Fodder Species In A Subhumid Environment: Relation To Use As Supplements, B H. Dzowela, L Hove, P L. Mafongoya

IGC Proceedings (1977-2023)

Studies were initiated in a subhumid Southern African environment to assess the chemical composition and nutritive value of Acacia angustissima (Mill.) Kuntze, Calliandra calothyrsus Meiss. and Leucaena species. The objective was to determine variability in crude protein (CP) concentration, acid detergent fibre (ADF), neutral detergent fibre (NDF), and soluble and insoluble proanthocyanidins from fodder samples of species, subspecies and provenances. A wide range was found in these parameters. The implications of these chemical composition factors, especially proanthocyanidins, on the use of these browse fodders in livestock feeding systems are discussed.

Nutritional Implications Of Bound Proanthocyanidins, H P.S Makkar, K Becker

IGC Proceedings (1977-2023)

The correlation between protein binding capacity of proanthocyanidin-rich neutral detergent fiber (NDF) and their proanthocyanidin (PAs) content was very low (r = -0.21; n = 6). These PAs-rich NDF did not affect growth of a tannin-sensitive strain of Clostridium perfringens. A substantial amount of bound PAs (75 to 92 %) disappeared from the NDF in 24 h of fermentation in an in vitro incubation medium containing rumen microbes. Addition of a tannin-binding agent, polyethylene glycol to the incubation medium containing rumen microbes and browses made free of extractable tannins or NDF rich in bound PAs increased the gas production up …

Environmental Effect On New Released Genotypes Of Graminaceous And Leguminous Forage Perennial Crops, P Martiniello, G Genier, R Allerit

IGC Proceedings (1977-2023)

Genotypes of perennial leguminous (alfalfa) and graminaceous (cocksfoot and tall fescue) were evaluated for adaptability in a typical Mediterranean environment (Foggia, southern Italy). The species were field evaluated to detect biomass yield potential under different types of watering. Irrigations were applied considering rainfall and FAO cultural growth coefficient for reintegrating the 75% of the evaporated water from Class A water pan. The forage harvest was applied when the shoots of the varieties reached the 10 and 50% of flowering and heading stage for leguminous and graminaceous, respectively. A split-plot experimental design, with irrigation in the main plot, was adopted. The …

Plant Tannins- Their Role In Forage Legume Quality, J A. Alokan, V A. Aletor

IGC Proceedings (1977-2023)

Forage legumes, especially browse plants, are important in the maintenance and survival of ruminant animals. However many browse species contain high levels of polyphenolic compounds including tannins. The effects of tannins on the quality of forages are reviewed. These include reduction in palatability and intake of feeds, growth rate, digestion of fibre fractions and nitrogen utilization by animals.

Genetic Manipulation Of Sainfoin Leaf Tannins, M Y. Gruber, P Auser, G Lees, A D. Muir, M Wood

IGC Proceedings (1977-2023)

An isogenic population of sainfoin (Onobrychis viciifolia Scop.) plants was developed by two methods; regeneration after long term tissue culture and plant transformation with an antisense chalcone synthase gene. Tannin (proanthocyanidin) content could be dramatically increased in untransformed callus by long term culture, but was not significantly altered in regenerating plantlets. Some of the mature transgenic plants had dramatically reduced levels of leaf tannin. The antisense gene was eliminated from all transgenic plants later in development.

Induction Of Mutants With Ectopic Expression Of Condensed Tannins, M Y. Gruber, B Skadhauge, P Auser, A D. Muir, K K. Thomsen, J Stougaard, B Coulman, D Von Wettstein

IGC Proceedings (1977-2023)

Leaves of 47,000 Lotus japonicus plants were screened using a butanol:HCl histochemical test to select “gain of function” mutants. These plants were progeny from L. japonicus lines which were transformed with T-DNA constructs containing either the maize Ds or Ac transposon (Thykjaer et al., 1995). Among 21 putative leaf tannin mutants, five (tan1-5) were characterized for synthesis of condensed tannins, leucocyanidin reductase activity and the presence of Ac and the selectable marker gene, nptII . A range of leaf tannin content among other Lotus species was also characterized.

A Revised Method Of Condensed Tannin Analysis In Leucaena Spp., S A. Dalzell, G L. Kerven

IGC Proceedings (1977-2023)

The proanthocyanidin (butanol-HCl) assay was used to measure condensed tannin (CT) in extracts from Leucaena spp. at the University of Queensland. Inconsistent results were found to be caused by the iron catalyst in the butanol/HCl reagent and the presence of ascorbic acid in the sample matrix which enhanced anthocyanidin development. In addition, preparation of sample extracts by back extraction with organic solvents reduced CT recoveries. An accurate and rapid technique was developed that measures CT directly in 70% aqueous acetone 0.1% (w/v) sodium metabisulphite plant extracts.

The Effect Of Condensed Tannins In Lotus Spp. On The Lesser Migratory Grasshopper, C F. Hinks, G L. Lees, M Y. Gruber, A D. Muir, J Soroka

IGC Proceedings (1977-2023)

Hatchling grasshoppers (Melanoplus sanguinipes Fab.) fed one accession of field grown big trefoil (Lotus uliginosis Schkuhr) containing a tannin content of 56 mg. g-1 FW, had a significantly lower mean weight than hatchlings fed field grown Lotus species and accessions with lower tannin content. Adult female grasshoppers fed L. uliginosis foliage with 32.3 mg.g-1 FW tannin also ate more feed and had a 2-fold higher gut trypsin and chymotrypsin activity than adults fed low tannin L. corniculatus foliage (0.13 mg.g-1 FW tannin). In more controlled experiments, growth at 20o C or 30o C was used to increase tannin …