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Full-Text Articles in Biochemistry, Biophysics, and Structural Biology

Developmental And Functional Analysis Of Scutes In The Armored Catfish Corydoras Aeneus, Emily Volk Jan 2019

Developmental And Functional Analysis Of Scutes In The Armored Catfish Corydoras Aeneus, Emily Volk

Undergraduate Honors Theses

Fish scales are specialized biological structures of current interest in innovative materials design because of the combination of protective function, flexibility, and light weight they offer. This study presents a developmental and functional investigation of a particular fish scale structure, the scutes (bony external plates) of the armored Bronze Corydoras Catfish (Corydoras aeneus). Scutes in this model fish species were analyzed via three complementary approaches. First, scutes were documented throughout fish development via high-quality microscope images. These images were subsequently used to inform fabrication of synthetic models to characterize the relationship between scute overlap and overall bending stiffness of scute ...


Investigation Into The Mechanism Of Ion Transport In Rio Negro Characiformes, Vineza D. Reduta May 2017

Investigation Into The Mechanism Of Ion Transport In Rio Negro Characiformes, Vineza D. Reduta

Undergraduate Honors Theses

Four fish species within the Characiform Order [(Rosy tetras (Hyphessobrycon rosaceus), Serpae tetras (Hyphessobrycon eques), Emperor tetras (Nematobrycon palmeri) and Penguin tetras (Thayeria obliqua)] are native to the ion-poor, acidic waters of the Rio Negro. In this paper, we focus on Wood’s revised Na+/NH4+ exchange model to gain better insight into the mechanisms of ion transport within the Characids. We exposed each species to two experimental treatments: (i) 1mM ammonia (high external ammonia [HEA]), to test coupling of Na+ uptake and ammonia excretion, and (ii) 100μM Acetazolamide (carbonic anhydrase inhibitor), to test coupling of Na+ uptake and ...


Effects Of Mound Nests Of The Ant Formica Podzolica On Soil Moisture, Nitrogen, And Vegetation, Madison Sankovitz Jan 2017

Effects Of Mound Nests Of The Ant Formica Podzolica On Soil Moisture, Nitrogen, And Vegetation, Madison Sankovitz

Undergraduate Honors Theses

Ants are widely regarded as ‘ecosystem engineers’ because they change the biological, chemical, and physical properties of the soil around their nests through nest construction and contributions to nutrient cycling. These processes were investigated in a species of alpine ant, Formica podzolica, to quantify its effects on soil structure and vegetation composition in an alpine ecosystem in Nederland, Colorado. Measurements of vegetation percent cover, biomass, species diversity and abundance, soil moisture and pH, and 15N in plants were taken at various distances from nests. A stable isotope analysis was utilized to determine the amount of 15N in vegetation ...


Physical Modeling Of Vortical Cross-Step Filtration In The Oral Cavity Of American Paddlefish (Polyodon Spathula), Hannah Brooks May 2016

Physical Modeling Of Vortical Cross-Step Filtration In The Oral Cavity Of American Paddlefish (Polyodon Spathula), Hannah Brooks

Undergraduate Honors Theses

This thesis explores the filter-feeding mechanisms of the American paddlefish, Polyodon spathula. The data indicate that paddlefish use a filtration method termed cross-step filtration, which utilizes vortices formed behind the branchial arches by the incoming water flow. Videos of these vortices were obtained and quantified for the first time inside the oral cavities of preserved paddlefish. Since the paddlefish can move the branchial arches within the oral cavity, the effects of changing branchial arch angle on vortex characteristics were studied in 3D models. The vortices in three models with different arch angles were quantified. The data demonstrated that a change ...