Life Sciences Commons^™

Choice Of End State Comfort Based On Time Spent At The Beginning State And The Precision Requirement Of The End State, Tucker Gregory Gamble

Undergraduate Honors Capstone Projects

People choose actions based on many different variables. In particular, choice of posture while grasping an object typically depends upon several factors including the time spent in that posture, what postures were held prior to choosing that posture, and the precision required by the posture. The purpose of this study was to test a trade-off between choice of end-state comfort based on time spent in a posture at the beginning-state and the precision requirement of the end-state. A comfortable grasp is classified when a person has a full grasp on an object with their thumb pointing up. This posture also …

Autism & Autoimmunity, Clarissa Nelson

Undergraduate Honors Capstone Projects

My research was for the Honors Capstone, and consisted of familiarizing myself with the vast amount of research in the fields of autism and autoimmunity and how the two may be connected, then going on to design a new project to help acquire more information where these two fields overlap. The official abstract I have written for this new project goes as follows: Our proposed research project is focused primarily in the fields of autism and autoimmunity, and hopes to uncover more evidence that these two fields are related. We believe that autism is an autoimmune disease, and our project …

Emergent Seedling Spatial Patterns Following Insect Seed Predation In A Simulated Population, Justin Tirrell

Undergraduate Honors Capstone Projects

Tropical vertebrate species have faced increasing pressures from hunters, causing many to become locally extinct. I used an agent-based model (NEDD) to investigate the influence of dispersal and insect seed predation on seedling survival. Statistical dispersal kernels were used to simulate the dispersal of seeds. The NEDD model generates survival and spatial data from parameter sets, which were chosen based on a Latin-Hypercube experimental design. Spatial point analysis was performed on the output data to identify trends in spatial clustering patterns as the parameter space was changed. The results of this investigation suggest that there is a positive association between …

Intra- And Interspecific Secondary Metabolite Variation Between Fruit And Leaf Tissues In The Hyperdiverse Psychotria Genus, Cole A. Carlson

Undergraduate Honors Capstone Projects

Secondary metabolites are chemical compounds that are considered to mediate a variety of plant interactions with their environment and are not involved in basic metabolism. Recently, there has been an interest in understanding the function and allocation of these metabolites in fruit tissues. In contrast to leaves, the chemistry in fruit tissue mediates exclusive interactions with seed dispersers that directly affect plant fitness and are under different evolutionary selective pressures. Only a few studies outline the patterns of chemistry between fruit and leaf tissues. This study aims to understand how secondary metabolites in two species of the hyperdiverse congeneric genus …

Exposure Of Phlebotomus Argentipes To Alpha-Cypermethrin, Permethrin, And Ddt Using Cdc Bottle Bioassays To Assess Insecticide Susceptibility, Jacob Rex Andersen

Undergraduate Honors Capstone Projects

Background: Insecticide resistance for sand flies is a concern since sand flies are vectors for Leishmania spp. parasites which cause leishmaniasis affecting millions of people each year. The CDC bottle bioassay is used to assess resistance by comparing known insecticide diagnostic doses and diagnostic times from an insecticide-susceptible population. The objective of this study was to determine diagnostic doses and diagnostic times for α-cypermethrin and the lethal dose for 50% and 90% mortality for α-cypermethrin, permethrin, and DDT for Phlebotomus argentipes.

Methods: The CDC bottle bioassays were performed in 1,000 mL glass bottles with 15-25 sand flies from a laboratory …

The Response Of Male Bumblebees To A Putative Queen Pheromone, Xavier K. Haemmerle

Undergraduate Honors Capstone Projects

Queen pheromones are chemical signals produced by the dominant reproductive female in many species of eusocial insects. These pheromones are vital for maintaining a reproductive division of labor. Two evolutionary scenarios may describe the origin of queen pheromones. Sensory exploitation describes a scenario where the pheromone is produced to take advantage of a preexisting sensory bias in a population. An alternative scenario is that the recipient of the pheromone has an adapted response to a preexisting chemical signal. There is a growing body of evidence that cuticular hydrocarbons that act as queen pheromones are co-opted from ancient fertility signals that …