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Articles 1 - 30 of 1213

Full-Text Articles in Life Sciences

Competitive Interactions Among Co-Infecting Symbionts In A Model Animal-Associated Microbiome, Justin L. Pritchett May 2021

Competitive Interactions Among Co-Infecting Symbionts In A Model Animal-Associated Microbiome, Justin L. Pritchett

Chancellor’s Honors Program Projects

No abstract provided.


Sciadopitys Verticillata (Japanese Umbrella Pine), #1065-1067, Grace C. Kubat Apr 2021

Sciadopitys Verticillata (Japanese Umbrella Pine), #1065-1067, Grace C. Kubat

BIO 140 Arboretum Project

Over the course of the 2021 spring semester, I observed a grove of Japanese Umbrella Pines. These trees are a part of the University's arboretum. In addition to making weekly observations, I researched the cultural significance of the Umbrella Pines. My research will hopefully contribute to future projects regarding the trees and help to enrich the University's arboretum project.


Density Dependent Growth Of Pseudomonas Fluorescens In The Presence And Absence Of C. Elegans Predation In Liquid Media, Jack Landmann Apr 2021

Density Dependent Growth Of Pseudomonas Fluorescens In The Presence And Absence Of C. Elegans Predation In Liquid Media, Jack Landmann

Honors Theses

The purpose of this study was to understand the predator-prey relationship between C. elegans worms and P. fluorescens bacteria in liquid media. We were aiming to create a predation model of the relationship between these two species.

This study was performed through three experiments. Using 96-well plates, we were able to measure the change in optical density (OD) of these wells and calculate the growth rate. This growth rate was then graphed and analyzed. The first experiment contained P. fluorescens and KB liquid media, this study demonstrated that the bacterial population has a carrying capacity. We were also able to ...


Fagus Sylvatica (European Beech), #1009, Megan L. Trafford Apr 2021

Fagus Sylvatica (European Beech), #1009, Megan L. Trafford

BIO 140 Arboretum Project

No abstract provided.


Tilia Cordata (Littleleaf Linden) #1059, Heather Noel Mckee Apr 2021

Tilia Cordata (Littleleaf Linden) #1059, Heather Noel Mckee

BIO 140 Arboretum Project

In this paper I studied the Tilia cordata, more commonly known as the Littleleaf Linden, over the course of three months. I included the history and uses of the Linden tree along with its symbolic value in European culture. This tree symbolizes friendship and peace which coincides with the critical concerns of the Sisters of Mercy.


Mediation Of The Uncoupled Enos Pathway Following Oxidative Stress Using Tetrahydrobiopterin And Nitric Oxide Donor Drugs To Restore Tetrahydrobiopterin Concentration, Brianna Munnich Apr 2021

Mediation Of The Uncoupled Enos Pathway Following Oxidative Stress Using Tetrahydrobiopterin And Nitric Oxide Donor Drugs To Restore Tetrahydrobiopterin Concentration, Brianna Munnich

Scholar Week 2016 - present

Presentation Location: Warming House, Olivet Nazarene University

Abstract

The eNOS pathway, found in the endothelium of blood vessels, is a key regulator of nitric oxide levels in the circulatory system. The pathway is controlled through several positive and negative feedback loops [2]. The cofactor tetrahydrobiopterin (BH4) is a major control point in this pathway and under conditions of stress can be reduced into the dihydrobiopterin (BH2) [2,6,7,8,9]. When the reduced form is predominant, the pathway produces reactive oxygen species (ROS) rather than nitric oxide, causing stress and damage to the vessels [6,7,8,9]. In ...


Morphological And Biological Variation Of The Self Progeny Of Pennisetum Purpureum, Chenglong Ding, Hongru Gu, Nengxiang Xu Apr 2021

Morphological And Biological Variation Of The Self Progeny Of Pennisetum Purpureum, Chenglong Ding, Hongru Gu, Nengxiang Xu

International Grassland Congress Proceedings

No abstract provided.


Black Apollo Of Science: The Life Of Ernest Everett Just - Summarizing Timeline, Sumitography And Concept Poster, Lillie R. Jenkins Apr 2021

Black Apollo Of Science: The Life Of Ernest Everett Just - Summarizing Timeline, Sumitography And Concept Poster, Lillie R. Jenkins

Perkins Faculty Research and Special Events

This two-part chronology is based on Kenneth R. Manning’s biography, Black Apollo of Science: The Life of Ernest Everett Just (1983). Like other such timelines, this one details Just’s life and pioneering research work. Additionally, and distinctively, this timetable lays out Just’s pioneering fund-seeking and his work mentoring African American female co-researchers (Part 1). A sumitography featuring the United States Postal Service’s postage stamp (1996) recognizes Just’s innovative thinking in biology (Part 2). Following this logic, the author includes a proof-of-concept poster commending E.E. Just’s work as a forward-thinking administrator. This timeline ...


Microhabitats In An Urban Greenspace: Function In The Beauty, Kalie Schultz Apr 2021

Microhabitats In An Urban Greenspace: Function In The Beauty, Kalie Schultz

Honors Projects

This project combines science with art, with a focus on microhabitats in a unique natural space in an urban area. It is set in the Highlands Nature Preserve and the mediums used are photography and digital illustration. The goal of the project is to bring the viewer in from a wide, landscape perspective into a more close and detailed perspective of the multiple microhabitats that exist in the nature preserve. It shows how beauty can be hiding in plain sight for anyone to see if they look close enough. It also aims to show how the beauty is not just ...


Cyclic Fluctuations Of Zooplankton Dynamics In A Tidal Salt-Marsh Basin, Jamaal Jacobs Apr 2021

Cyclic Fluctuations Of Zooplankton Dynamics In A Tidal Salt-Marsh Basin, Jamaal Jacobs

Senior Theses

Zooplankton are pelagic aquatic animals that are limited in their movements by the water currents around them and are major links in aquatic food webs between primary producers and higher trophic levels. Their populations are temporally and spatially variable, as they are sensitive to changes in salinity, temperature, and dissolved oxygen. This is especially true in highly dynamic environments, like estuaries, where environmental conditions are highly variable across seasonal and daily cycles. In order to examine the variability in zooplankton populations across a tidal cycle, we collected zooplankton samples from North Inlet Estuary at 30-minute intervals over a half tidal ...


Osmosis - Spring 2020 Mar 2021

Osmosis - Spring 2020

Osmosis Magazine

Osmosis is a student read, led, and written publication from the University of Richmond, focusing on all aspects of healthcare and science.


Osmosis - Spring 2019 Mar 2021

Osmosis - Spring 2019

Osmosis Magazine

Osmosis is a student read, led, and written publication from the University of Richmond, focusing on all aspects of healthcare and science.


Osmosis - Fall 2019 Mar 2021

Osmosis - Fall 2019

Osmosis Magazine

Osmosis is a student read, led, and written publication from the University of Richmond, focusing on all aspects of healthcare and science.


Effects Of Varying Heat Indexes On Habitat Utilization And Behavior On Captive Red-Ruffed Lemurs (Varecia Rubra), Jeffrey Gammon Mar 2021

Effects Of Varying Heat Indexes On Habitat Utilization And Behavior On Captive Red-Ruffed Lemurs (Varecia Rubra), Jeffrey Gammon

The Pegasus Review: UCF Undergraduate Research Journal

The two captive red-ruffed lemurs (Varecia rubra) at the Central Florida Zoo experienced a more temperate climate and utilized a differing habitat than they would in their native range, Madagascar. Proper management of the species in captivity is crucial for its long-term survival as they are critically endangered. Over a four month period, heat index temperature, lemur behavior, and habitat utilization data were collected via an instantaneous scan sample. Variables were analyzed to characterize how variations in heat index alter habitat utilization and behavior of the captive lemurs. As the heat index increased, habitat use became more restricted with a ...


Aphid Natural Enemies And Biological Control, Ron Patterson, Ricardo Ramirez Feb 2021

Aphid Natural Enemies And Biological Control, Ron Patterson, Ricardo Ramirez

All Current Publications

This fact sheet lists common arthropods of Utah that eat aphids. It will help identify those arthropods and will describe management practices that aid in their success. Many of these predators will eat other plant damaging insects in addition to aphids.


Observational Study Of Two Ex Situ North American River Otters (Lontra Canadensis), Julia Rifenberg Feb 2021

Observational Study Of Two Ex Situ North American River Otters (Lontra Canadensis), Julia Rifenberg

The Pegasus Review: UCF Undergraduate Research Journal

Zoos enable the ability to study how captive conditions impact the behaviors of animals. In this study, I observed two North American river otters housed at the Central Florida Zoo to evaluate behavioral changes after the male had been removed from the female for a month-long medical examination. The aim of this study was to 1) determine if mating behaviors were still occurring between the two river otters following the male’s removal and 2) to assess the welfare of the male and female river otters in captivity by observing their interactions and individual behaviors. Observed behaviors were compared to ...


The Future Of Organic Insect Pest Management: Be A Better Entomologist Or Pay For Someone Who Is, David H. Headrick Feb 2021

The Future Of Organic Insect Pest Management: Be A Better Entomologist Or Pay For Someone Who Is, David H. Headrick

Horticulture and Crop Science

Insect pest management in certified organic production systems presents considerable challenges for growers. The Federal National Organic Program (NOP) guidelines list acceptable tactics, but their effective use requires a considerable knowledgebase in entomology. The range of tactics allowed by the NOP are viewed as limiting by many growers and there are important elements missing from the list such as pest monitoring and identification. Educational programs must consider utilizing instructional methods and additional means of outreach that introduce new pest management tactics that are individualized, regionally appropriate and emphasize grower adoption and collaboration with local professionals. This review describes the challenges ...


Science, Physiology, And Nutrition For The Nonscientist, Judi S. Morrill Jan 2021

Science, Physiology, And Nutrition For The Nonscientist, Judi S. Morrill

Open Educational Resources

A wonderful blend of physiology, nutrition, biochemistry, genetics, biology, evolution, chemistry--what we all need to know as informed citizens. A basic knowledge of the life sciences and how our bodies work--to promote our own good health, especially as we're bombarded with misleading advertisements, soundbites, and the like. DNA fingerprinting, calorie requirements, dietary advice, genetic engineering (including gene editing with CRISPR cas9)--all in an easy-to understand book.


Decreased Cortisol Among Hikers Who Preferentially Visit And Value Biodiverse Riparian Zones, Ellie Opdahl, Kathryn Demps, Julie A. Heath Jan 2021

Decreased Cortisol Among Hikers Who Preferentially Visit And Value Biodiverse Riparian Zones, Ellie Opdahl, Kathryn Demps, Julie A. Heath

Anthropology Faculty Publications and Presentations

While outdoor recreationists often report increases to their well-being for time spent in nature, the mechanisms through which local ecologies affect human health have been difficult to quantify, and thus to manage. We combine data from pre-post salivary cortisol measures, GPS tracks, visitor photos, and surveys from 88 hikers traversing several types of landscape within peri-urban public lands in southwest Idaho, USA. We find that time in biodiverse riparian areas and areas of perceived aesthetic value correlates with decreases in salivary cortisol and improved well-being for hikers. Wildlife sightings were not associated with changes in salivary cortisol, but were associated ...


Change In The Behaviors And Spatial Use Of Canada Lynx (Lynx Canadensis) Over Time At John Ball Zoo, Hailee Cederquist Jan 2021

Change In The Behaviors And Spatial Use Of Canada Lynx (Lynx Canadensis) Over Time At John Ball Zoo, Hailee Cederquist

Student Summer Scholars Manuscripts

Felines are popular attractions at zoos across the country, even more so when young animals are involved. As such caretakers strive to ensure that their animal’s needs are met, and individuals display healthy behaviors and activity levels in comparison to their wild counterparts (Mcphee & Carlstead, 2010). However, cats, being wide-ranging carnivores, are known to be prone to stereotypical behaviors which can be detrimental to an animal’s health (Clubb & Mason, 2003). At John Ball Zoo in Grand Rapids, Michigan, we observed the behaviors and spatial use of 3 Canada lynx (Lynx canadensis) during the summer of 2020; an adult male, an adult female, and the offspring of the two, a female kitten born in 2020. The adult male and adult female were also observed during the summers of 2018 and 2019. Our goal in observing the cats was to determine whether changes in the cats’ social structure and changes in their enclosure ...


Evolution And Development Of Staminodes In Paronychia (Caryophyllaceae), Andrea D. Appleton Jan 2021

Evolution And Development Of Staminodes In Paronychia (Caryophyllaceae), Andrea D. Appleton

Honors College Theses

Staminodes are infertile stamens that have evolved numerous times in flowering plants and exhibit a vast array of forms and functions. Variation in staminodes suggests that numerous evolutionary processes underlie their origins, but to understand their how and why they evolved, comparative studies are needed in groups of closely related species. Identifying structures as staminodes is not always straightforward and sometimes requires corroborating phylogenetic and developmental evidence. Staminodial structures in Paronychia (Caryophyllaceae), for example, vary in shape and size and have been referred to as both petals and staminodes, rendering their homology uncertain. The development of staminodes was compared across ...


Lifelines Winter 2021, Southern Adventist University Jan 2021

Lifelines Winter 2021, Southern Adventist University

Lifelines - Biology Department Newsletter

No abstract provided.


The Cottonwood Ranch Riparian Management Case Study, Sherman Swanson, Kent Mcadoo, Agee Smith, Sandra Wyman Dec 2020

The Cottonwood Ranch Riparian Management Case Study, Sherman Swanson, Kent Mcadoo, Agee Smith, Sandra Wyman

International Grassland Congress Proceedings

No abstract provided.


The Role Of Antioxidant Gene Regulation During Bacterial Oxidative Stress Response, Lily Vu Dec 2020

The Role Of Antioxidant Gene Regulation During Bacterial Oxidative Stress Response, Lily Vu

Honors Theses

Reactive oxygen species (ROS) are produced naturally in a cell and when the cell is in homeostasis, there is an equilibrium of ROS and antioxidants (enzymes that combat ROS). Stresses can occur such as "Oxidative Stress" which results in an influx of ROS compared to antioxidants in the cell and could lead to damage of DNA, lipids and proteins and also cell death. To return the cell’s homeostatic state, bacteria have evolved to contain defense mechanisms to eradicate ROS. This paper will focus on the regulation of antioxidants that are produced to eliminate high concentrations of ROS when the ...


Student Success Of Online Vs. In-Person Biology Courses At Virginia Community Colleges, Jennifer Claire Scott Dec 2020

Student Success Of Online Vs. In-Person Biology Courses At Virginia Community Colleges, Jennifer Claire Scott

Doctoral Dissertations and Projects

Community colleges have a significant role in preparing students for STEM-related careers through certificates, degrees, and transfers to four-year institutions. In addition, online education is a growing mode of higher education, particularly for community college students. However, community college and online students are both at a high risk of attrition and show a lower success rate for degree completion. The purpose of this study was to identify differences in attrition and success between students in online and in-person biology courses at Virginia community colleges. Also, this study addressed downstream effects of online education by examining course completion of second-semester biology ...


Illegal Killing Of Nongame Wildlife And Recreational Shooting In Conservation Areas, Jay D. Carlisle, Eve C. Thomason, James R. Belthoff, Julie A. Heath, Kristina J. Parker, Heather M. Hayes, Madeline C. Alberg, Sandra M. Amdor, Steven E. Alsup, Stephanie E. Coates Nov 2020

Illegal Killing Of Nongame Wildlife And Recreational Shooting In Conservation Areas, Jay D. Carlisle, Eve C. Thomason, James R. Belthoff, Julie A. Heath, Kristina J. Parker, Heather M. Hayes, Madeline C. Alberg, Sandra M. Amdor, Steven E. Alsup, Stephanie E. Coates

Intermountain Bird Observatory Publications and Presentations

Illegal killing of nongame wildlife is a global yet poorly documented problem. The prevalence and ecological consequences of illegal killing are often underestimated or completely unknown. We review the practice of legal recreational shooting and present data gathered from telemetry, surveys, and observations on its association with illegal killing of wildlife (birds and snakes) within conservation areas in Idaho, USA. In total, 33% of telemetered long‐billed curlews (Numenius americanus) and 59% of other bird carcasses found with known cause of death (or 32% of total) were illegally shot. Analysis of spatial distributions of illegal and legal shooting is consistent ...


Assess Physical Functioning Of Riparian Systems With An Eye Toward Management, Sherman Swanson, Sandra Wyman, Kent Mcadoo Oct 2020

Assess Physical Functioning Of Riparian Systems With An Eye Toward Management, Sherman Swanson, Sandra Wyman, Kent Mcadoo

International Grassland Congress Proceedings

No abstract provided.


Therapeutic Potential Role Of Exosomes For Ischemic Stroke, Zhihan Zhu, Bikram Shah Kalyan, Lukui Chen Oct 2020

Therapeutic Potential Role Of Exosomes For Ischemic Stroke, Zhihan Zhu, Bikram Shah Kalyan, Lukui Chen

Brain Science Advances

Exosomes are extracellular vesicles with a diameter of 30–100 nm, which are released into the extracellular space by fusion of multi- vesicular and plasma membranes. These vesicles actually play a distinct role in cell communication, although they were considered as membrane debris in the past. The endosomal sorting complex required for transport (ESCRT)-dependent and ESCRT-independent mechanisms are currently considered to be involved in the sorting of exosomes, and the release of exosomes is related to the members of Rab protein family and SNARE family. In recent years, the therapeutic potential of exosomes has become apparent. For example, via ...


Inheritability Of Ciprofloxacin-Induced Mitochondrial Mutations From Parental To Offspring Generation Using Quantitative Polymerase Chain Reaction, Rose Mccoy Oct 2020

Inheritability Of Ciprofloxacin-Induced Mitochondrial Mutations From Parental To Offspring Generation Using Quantitative Polymerase Chain Reaction, Rose Mccoy

Honors Theses, University of Nebraska-Lincoln

In all eukaryotes, mitochondria are known as the powerhouse of the cell (Siekevitz, 1957). In plants, however, their mitochondrial genome is especially strange. Plant mitochondrial genomes are extremely large and contain both linear and circular subgenomic DNA fragments. Plant mitochondrial genomes undergo a significant amount of mutations in the form of rearrangements. However, it is not known how often these rearrangements are inherited by the next generation. It is thought that plant cells that are still dividing have higher rates of DNA repair, such as double-strand break repair, to ensure the quality of that plant lineage. As follows, it is ...


A Comparison Of Invasive And Native Plants In An Abandoned Limestone Quarry, Diana Borse, Sophia Atkinson, Dana Dudle Oct 2020

A Comparison Of Invasive And Native Plants In An Abandoned Limestone Quarry, Diana Borse, Sophia Atkinson, Dana Dudle

Science Research Fellows Posters

The abandoned limestone quarry in the DePauw Nature Park is a site of interest for research into plant community establishment due to the harsh, heterogenous, and fluctuating environment. Because the limestone floor of the quarry is a novel anthropogenic environment, every plant species in the quarry had to be introduced somehow. Perhaps native species that are able to establish populations in the quarry are more likely to share traits with invasive species. Using information collected from scientific articles, I compared traits of three pairs of plants with similar forms to compare their life history traits to see if any patterns ...