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Articles 811 - 840 of 2330
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Evolutionary History Of A Large-Genome Salamander Across Five Disjunct Regions Of The Southeastern United States, Catherine Elizabeth Newman
Evolutionary History Of A Large-Genome Salamander Across Five Disjunct Regions Of The Southeastern United States, Catherine Elizabeth Newman
LSU Doctoral Dissertations
The southeastern United States has a dynamic geologic history. Mountain range uplift, sea level fluctuations, and river basin evolution have shaped species geographic distributions in the region. My dissertation objectively identifies amphibian species with highly fragmented distributions in the Southeast (Chapter 2) and examines the phylogeographic history of one of those species, Plethodon serratus. This salamander species has a widely disjunct range across five regions: the Appalachians, the Ozarks, the Ouachitas, and two allopatric sites in Louisiana. Analyses of mitochondrial and nuclear loci (Chapter 3) showed that P. serratus is comprised of multiple genetic lineages, and the five regions are …
Descendants Of Abraham: A Comparative Approach To Jewish And Islamic Rhetorics, Brandon Katzir
Descendants Of Abraham: A Comparative Approach To Jewish And Islamic Rhetorics, Brandon Katzir
LSU Doctoral Dissertations
Descendants of Abraham: A Comparative Approach to Jewish and Islamic Rhetorics provides two important correctives to modern scholarship. It emphasizes the importance of Jewish and Islamic rhetorics typically neglected by Western-centric historians of rhetoric, and it showcases the cultural relationship between Jews and Muslims that has been typically occluded by modern scholarship. Focusing on the early Islamic world, I demonstrate instantiations of interconnectivity between Jewish and Islamic rhetoric in Arabic from the 9th-12th centuries CE. Specifically, I look at how judicial rhetoric plays an important role in the adjudication of halakha and sharia, followed by a consideration of theological rhetoric …
Chemical Synthesis: New Methods For O-Glycosylation And The Preparation Of Organic Thin Films, Rashanique Deondria Quarels
Chemical Synthesis: New Methods For O-Glycosylation And The Preparation Of Organic Thin Films, Rashanique Deondria Quarels
LSU Doctoral Dissertations
This dissertation focuses on the diverse use of chemical synthesis. Herein, I will discuss the use of synthetic organic chemistry for the modification surfaces and the synthesis of small molecules. Chapter One is an introduction to the realm of surface chemistry. I have highlighted some key methods for surface modification. Additionally, methods to characterize the as-formed thin films are also outlined. In Chapter Two, I discuss the use of visible-light photoredox catalysis in the nanoscale lithography of Au(111) surfaces. Blue LED irradiation of solutions of NBDT in the presence of Ru(bpy)32+ results in the formation of p-nitrophenyl radicals that graft …
Numerical Simulations Of Mass Transfer In Close And Contact Binaries Using Bipolytropes, Kundan Vaman Kadam
Numerical Simulations Of Mass Transfer In Close And Contact Binaries Using Bipolytropes, Kundan Vaman Kadam
LSU Doctoral Dissertations
We present the first self-consistent, three dimensional study of hydrodynamic simulations of mass transfer in close and contact binary systems, with both stars represented as bipolytropes (composite polytopes). The project is motivated by the recent eruption of V1309 Scorpii which was proved to be the merger of a contact binary system. The final eruption is assumed to be the disruption of the core of the secondary inside the more massive star. The initial, equilibrium binary models are rotating synchronously in circular orbits and are obtained using the Bipolytropic Self Consistent Field (BSCF) technique, which is a modi cation of Hachisu's …
Design, Synthesis, And Evaluation Of Innovative Bodipy-Peptidic Conjugates For Biological Application, Tyrslai Menyaee Williams
Design, Synthesis, And Evaluation Of Innovative Bodipy-Peptidic Conjugates For Biological Application, Tyrslai Menyaee Williams
LSU Doctoral Dissertations
Abstract Chapter 1 provides a brief introduction to colorectal cancer (CRC), methods of detection, photodynamic therapy (PDT), and EGFR as an attractive targeting strategy for imaging CRC. Chapter 2 details the synthesis of ten peptide sequences for targeting EGFR receptors at the site of CRC, as a collaborative work with Dr. Seetharama Jois. This chapter also investigates the efficacy of these peptides for EGFR. Chapter 3 offers the first synthetic strategy for developing BODIPY-peptide conjugates via amide linkages. All conjugates were optimized for the best reaction conditions and good yields were observed. Each conjugate was subjected to photophysical, SPR, and …
A Palynostratigraphic Investigation Of Holocene Coastal Texas Bays: Implications For Future Coastal Change, Shannon Marie Ferguson
A Palynostratigraphic Investigation Of Holocene Coastal Texas Bays: Implications For Future Coastal Change, Shannon Marie Ferguson
LSU Doctoral Dissertations
Although the Gulf of Mexico is one of the most studied basins in the world, a majority of the focus has been driven by petroleum exploration and/or on seismic and sedimentological facies models. Rarely has the intent of previous studies been to characterize the Holocene climatic record of coastal Texas. Of those studies that discuss Holocene vegetation change, the majority focus on the Mississippi River Delta, the Edwards Plateau or central Florida, leaving an absence of insight to western Gulf of Mexico climate changes. The Texas coastline stretches 595 km across almost 4° of latitude and the strong northwestern precipitation …
Effect Of Metal Speciation In Fly Ash On Environmentally Persistent Free Radical Formation, Elisabeth Eileen Cook
Effect Of Metal Speciation In Fly Ash On Environmentally Persistent Free Radical Formation, Elisabeth Eileen Cook
LSU Doctoral Dissertations
Waste incineration and Superfund sites lead to the formation of pollutants harmful to both the environment and human health. Environmentally Persistent Free Radicals (EPFRs) are a class of newly discovered radical pollutants known to form on combustion by-products such as fly ash and particulate matter. EPFRs are rapidly gaining attention for their harmful effects on the environment and human health. Previous research has shown the formation of EPFRs through surface-mediated reactions with transition metal-oxides on particulates. The work presented in this dissertation explores the relationship between fly ash composition and EPFR formation. Fly ash production occurs from combustion systems, namely …
Aleksander Peçi Before And After The Iron Curtain, Elida Dakoli
Aleksander Peçi Before And After The Iron Curtain, Elida Dakoli
LSU Doctoral Dissertations
Abstract This research describes the life, compositional style and works of one of the most well-known Albanian composers, Aleksander Peçi, focusing on how the political climate affected his life and his art. Several of Peçi’s techniques are examined, including Carousel structure, Cartesian Production, Kabaoisos, and Polygravité. Albanian iso-polyphony and its influence on Peçi’s work are discussed. The research was done in hopes of reaching a better understanding of the effects Communism and the subsequent period of freedom have had on Albanian music.
The Effects Of Instrumental Noise On Searches For Generic Transient Gravitational Waves In Advanced Ligo, Marissa Walker
The Effects Of Instrumental Noise On Searches For Generic Transient Gravitational Waves In Advanced Ligo, Marissa Walker
LSU Doctoral Dissertations
One hundred years after Albert Einstein predicted the existence of gravitational waves as a result of his theory of general relativity, the Laser Interferometer Gravitational-Wave Observatory (LIGO), made the first direct detection of a gravitational-wave signal from a binary black hole merger, GW150914. GW150914 was found not only by search methods specifically developed to find the distinctive waveform produced by coalescing binaries, but also by generic searches designed to find any arbitrary short-duration signal in the LIGO data. The impact of noise on the searches must be carefully investigated in order to reduce the search background and enable confident gravitational-wave …
A Mixed Methods Analysis Of School- And Student-Level Effects: Mathematics Course Completion And Achievement Beyond Algebra 2 Among Mexican American Female High School Students, Lester Archer
LSU Doctoral Dissertations
In the United States, as the Hispanic population continues to grow, persistently low mathematics achievement among Mexican Americans continues to exist, particularly among girls. Low mathematics achievement places this group in a disadvantaged position. As such, a multistage mixed method study was implemented to investigate possible factors associated with mathematics achievement and the probability of taking mathematics courses beyond Algebra 2 among Mexican American female high school students. The Educational Longitudinal Study (ELS:2002) database provided the quantitative sample (n = 710) of respondents who self-identified as Mexican American, female, and had a math IRT score. A parallel sample (n = …
Assessing And Modeling Community Resilience To Coastal Hazards Using A Bayesian Network, Heng Cai
Assessing And Modeling Community Resilience To Coastal Hazards Using A Bayesian Network, Heng Cai
LSU Doctoral Dissertations
This dissertation presents the assessment and modeling of community resilience to coastal hazards in the Lower Mississippi River Basin (LMRB) in southeastern Louisiana at the census block group scale. The first part is to provide a quantitative method to assess and validate the community resilience index to coastal hazards and identify the relationships between a set of socio-environmental indicators and community resilience. The Resilience Inference Measurement (RIM) model was applied to assess the resilience of the block groups. The resilience index derived was empirically validated through two statistical procedures: K-means cluster analysis of three variables (exposure, damage, and recovery) to …
Succinct Data Structures For Parameterized Pattern Matching And Related Problems, Arnab Ganguly
Succinct Data Structures For Parameterized Pattern Matching And Related Problems, Arnab Ganguly
LSU Doctoral Dissertations
Let T be a fixed text-string of length n and P be a varying pattern-string of length |P| <= n. Both T and P contain characters from a totally ordered alphabet Sigma of size sigma <= n. Suffix tree is the ubiquitous data structure for answering a pattern matching query: report all the positions i in T such that T[i + k - 1] = P[k], 1 <= k <= |P|. Compressed data structures support pattern matching queries, using much lesser space than the suffix tree, mainly by relying on a crucial property of the leaves in the tree. Unfortunately, in many suffix tree variants (such as parameterized suffix tree, order-preserving suffix tree, and 2-dimensional suffix tree), this property does not hold. Consequently, compressed representations of these suffix tree variants have been elusive. We present the first compressed data structures for two important variants of the pattern matching problem: (1) Parameterized Matching -- report a position i in T if T[i + k - 1] = f(P[k]), 1 <= k <= |P|, for a one-to-one function f that renames the characters in P to the characters in T[i,i+|P|-1], and (2) Order-preserving Matching -- report a position i in T if T[i + j - 1] and T[i + k -1] have the same relative order as that of P[j] and P[k], 1 <= j < k <= |P|. For each of these two problems, the existing suffix tree variant requires O(n*log n) bits of space and answers a query in O(|P|*log sigma + occ) time, where occ is the number of starting positions where a match exists. We present data structures that require O(n*log sigma) bits of space and answer a query in O((|P|+occ) poly(log n)) time. As a byproduct, we obtain compressed data structures for a few other variants, as well as introduce two new techniques (of independent interest) for designing compressed data structures for pattern matching.
Numerical Study Of The Periodic Anderson Model With Holstein Phonons For The Description Of Cerium Volume Collapse, Enzhi Li
LSU Doctoral Dissertations
The volume collapse transition of Cerium has intrigued physicists since its discovery several decades ago. Various models and mechanisms have been proposed, the most prominent scenarios are based on the Mott transition and the Kondo volume collapse transition. In this study, we explore the volume collapse by a dynamical mean field theory (DMFT) study of the periodic Anderson model with electron-phonon coupling to the conduction band. This allows us to study the effect of the electron-phonon interaction on the volume collapse. In order to faithfully account for the volume collapse, we also include the effects due to the volume and …
Extraction Of Displacement Fields In Heterogeneous Media Using Optimal Local Basis Functions, Paul Derek Sinz
Extraction Of Displacement Fields In Heterogeneous Media Using Optimal Local Basis Functions, Paul Derek Sinz
LSU Doctoral Dissertations
The Multiscale Spectral Generalized Finite Element Method (MS-GFEM) was developed in recent work by Babuska and Lipton. The method uses optimal local shape functions, optimal in the sense of the Kolmogorov n-width, to approximate solutions to a second order linear elliptic partial differential equation with L-infinity coefficients. In this dissertation an implementation of MS-GFEM over a two subdomain partition of unity is outlined and several numerical experiments are presented. The method is applied to compute local fields inside high contrast particle suspensions. The method's performance is evaluated for various examples with different contrasts between reinforcement particles and matrix material. The …
How I Got Over: A Study Of The Tenure Experiences Of Black Female Professors At Predominantly White Institutions, Veta E. Parker
How I Got Over: A Study Of The Tenure Experiences Of Black Female Professors At Predominantly White Institutions, Veta E. Parker
LSU Doctoral Dissertations
This study explored the tenure experiences of seven Black female professors as they pursued tenure at select public higher/highest research activity predominantly white institutions. This study was pursued in an attempt to determine what challenges were presented during the tenure process. More importantly, this study sought to determine the role of mentorship in the pursuit of tenure. In addition, recommendations for success were offered to Black females who are currently pursuing tenure or who may choose to enter the academy. A narrative research study was utilized for this study which was informed by Black Feminist Thought. This allowed for a …
A Graph-Based Taxonomic Intelligent Tutoring System Utilizingbloom’S Taxonomy And Item-Response Theoretic Assessment, Dennis Gordon Castleberry Ii
A Graph-Based Taxonomic Intelligent Tutoring System Utilizingbloom’S Taxonomy And Item-Response Theoretic Assessment, Dennis Gordon Castleberry Ii
LSU Doctoral Dissertations
This dissertation details an intelligent tutoring system which aims to raise student trait abilities across concepts and levels of Blooms taxonomy within an educational program. The system utilizes Item Response Theory, a probabilistic theory of assessment which accounts for item discrimination, difficulty, and probability of guessing in its assessment of student trait ability. A modification to Item Response Theory which accounts for question dependencies is used to assess the probability that a student will answer a given question correctly given prior responses on the dependency questions. It also draws from theories of memory and forgetting present in the ACT-R model …
La Garza En Bicicleta: Perceptions Of Latina Faculty On The Role Of Organizational Citizenship Behaviors And Institutional Engagement On Tenure And Promotion At Research 1 Doctoral Institutions, Julie Johanna Henriquez
La Garza En Bicicleta: Perceptions Of Latina Faculty On The Role Of Organizational Citizenship Behaviors And Institutional Engagement On Tenure And Promotion At Research 1 Doctoral Institutions, Julie Johanna Henriquez
LSU Doctoral Dissertations
A predicted population shift will increase the number of underrepresented groups entering the workforce, with Latinxs accounting for the majority of employees. Consequently, the number of Latinxs enrolled in colleges and universities nationwide will increase. This shift in the college student body demographic will in turn call for an increase in the number of underrepresented faculty members to provide support and mentorship to students. It is concerning to see that only 2% of tenured faculty identified as Latina in 2013-2014. This number will need to increase in order to support the predicted increase in Latinxs pursuing higher education. The purpose …
Branch And Stem Growth As Affected By Loss Of Leaf Area On Selected Branches In Loblolly Pine, Shannon Dumo Kidombo
Branch And Stem Growth As Affected By Loss Of Leaf Area On Selected Branches In Loblolly Pine, Shannon Dumo Kidombo
LSU Doctoral Dissertations
Leaf area and crown dynamics control how trees grow through their supply of carbohydrates and growth regulators, and their influence on tree mechanical stability. The influence of leaf area and crown dynamics to tree growth was investigated by testing the interdependence between leaf area, branch, and stem growth on young loblolly pine trees. The objectives were to (1) determine the influence of current and previous year’s leaf area on elongation of branches; (2) describe and test a unique way of quantitatively measuring the effect of neighbor branches on net growth of a target branch; (3) quantify the growth impact of …
Microscopic Evaluations Of Bone In Equine And Muroid Models, Heather Ashley Richbourg
Microscopic Evaluations Of Bone In Equine And Muroid Models, Heather Ashley Richbourg
LSU Doctoral Dissertations
The use of advanced imaging techniques has greatly improved orthopedic research and education. Histology of bone is a method of evaluating bone morphology, bony cells, and bone remodeling in two-dimensions, while micro-computed tomography (microCT) is a three-dimensional analysis of bone morphology. Combined, these methods assist in providing a comprehensive analysis of bone. In this dissertation, these techniques were utilized to answer questions currently outstanding in veterinary medicine: the effect of bisphosphonates on equine bone, and variation in murine tarsal anatomy. Bisphosphonates are drugs that reduce osteoclast-mediated bone resorption and have recently been approved for the use in horses. Despite prolific …
Analysis And Optimization Of Scientific Applications Through Set And Relation Abstractions, M. Tohid (Rastegar Tohid, Mohammed)
Analysis And Optimization Of Scientific Applications Through Set And Relation Abstractions, M. Tohid (Rastegar Tohid, Mohammed)
LSU Doctoral Dissertations
Writing high performance code has steadily become more challenging since the design of computing systems has moved toward parallel processors in forms of multi and many-core architectures. This trend has resulted in exceedingly more heterogeneous architectures and programming models. Moreover, the prevalence of distributed systems, especially in fields relying on supercomputers, has caused the programming of such diverse environment more difficulties. To mitigate such challenges, an assortment of tools and programming models have been introduced in the past decade or so. Some efforts focused on the characteristics of the code, such as polyhedral compilers (e.g. Pluto, PPCG, etc.) while others …
Exact Numerical Study Of Disordered Systems, Conrad Wilson Moore
Exact Numerical Study Of Disordered Systems, Conrad Wilson Moore
LSU Doctoral Dissertations
This thesis presents work on the development of new techniques to study the problem of localization in various models of disordered systems with the goal of being able to extend these model calculations to real materials where these various mechanisms of disorder can all be present. I consider the Anderson Model with diagonal, off-diagonal disorder, multiple bands and superconductivity is included at the level of a Bogoliubov - De Gennes mean field (superconductivity is considered by adding the symmetries of the Bogoliubov - De Gennes Hamiltonian on top of the disordered lattice Hamiltonian). The localization of electrons is studied with …
Revisions To Rainfall Intensity Algorithms In Przm5.0 To Improve Estimates Of Off-Field Runoff, Eroded Sediment And Pesticide Mass, Tammara Levey Estes
Revisions To Rainfall Intensity Algorithms In Przm5.0 To Improve Estimates Of Off-Field Runoff, Eroded Sediment And Pesticide Mass, Tammara Levey Estes
LSU Doctoral Dissertations
The Environmental Protection Agency (EPA) model Pesticide Root Zone Model, version 5.0 (PRZM5.0) is used to estimate off-field loadings of pesticide concentrations in runoff and eroded sediment. Climate change has resulted in an increase in rainfall intensity patterns for much of the United States. This change impacts off-field runoff and eroded sediment as well as off-field pesticide loads from agricultural fields. Thus, the PRZM5.0 EPA “lookup” table for runoff curve numbers and the internal algorithm for eroded sediment estimation have become outdated since both temporal and geographical conditions have changed. This research presents (1) a revised method for estimating runoff …
Pre-College Credit And Examination Programs: One Size Fits All?, Guadalupe M. Lamadrid
Pre-College Credit And Examination Programs: One Size Fits All?, Guadalupe M. Lamadrid
LSU Doctoral Dissertations
The purpose of this mixed methods study was to utilize a comprehensive 9-16 dataset to quantitatively examine which pre-college credit programs are the most significant predictors of college achievement as defined by college GPA, first to second year retention, time to degree and graduation date. A qualitative analysis was conducted, which via the use of a survey allowed students to share their perceptions and feeling regarding their pre-college credit experiences. Data for this study was obtained from institutional sources and consisted of 9-16 detail high school record, admissions, financial aid, scholarship and enrolled student information. Univariate and Multi-variate statistical analyses …
Moduli Spaces Of Flat Gsp-Bundles, Neal David Livesay
Moduli Spaces Of Flat Gsp-Bundles, Neal David Livesay
LSU Doctoral Dissertations
A classical problem in the theory of differential equations is the classification of first-order singular differential operators up to gauge equivalence. A related algebro-geometric problem involves the construction of moduli spaces of meromorphic connections. In 2001, P. Boalch constructed well-behaved moduli spaces in the case that each of the singularities are diagonalizable. In a recent series of papers, C. Bremer and D. Sage developed a new approach to the study of the local behavior of meromorphic connections using a geometric variant of fundamental strata, a tool originally introduced by C. Bushnell for the study of p-adic representation theory. Not only …
Empirically Tuning Hpc Kernels With Ifko, Md Majedul Haque Sujon
Empirically Tuning Hpc Kernels With Ifko, Md Majedul Haque Sujon
LSU Doctoral Dissertations
iFKO (iterative Floating point Kernel Optimizer) is an open-source iterative empirical compilation framework which can be used to tune high performance computing (HPC) kernels. The goal of our research is to advance iterative empirical compilation to the degree that the performance it can achieve is comparable to that delivered by painstaking hand tuning in assembly. This will allow many HPC researchers to spend precious development time on higher level aspects of tuning such as parallelization, as well as enabling computational scientists to develop new algorithms that demand new high performance kernels. At present, algorithms that cannot use hand-tuned performance libraries …
Quaternary River Erosion, Provenance, And Climate Variability In The Nw Himalaya And Vietnam, Tara Nicole Jonell
Quaternary River Erosion, Provenance, And Climate Variability In The Nw Himalaya And Vietnam, Tara Nicole Jonell
LSU Doctoral Dissertations
The influence of Quaternary climate variation on sediment generation, storage, and transport in two mountainous Asian river basin was examined in the largest tributary to the upper Indus River in the Himalayan rain shadow, the Zanskar River basin (~15,000 km2), and the smaller, subtropical Song Gianh basin (<3,500 km2) of central Vietnam. Spatial patterns of erosion in the Zanskar River Basin were established to quantify the dominant controls on Quaternary sedimentation in the Himalayan rain shadow on the edge of the Tibetan Plateau. Glacial erosion and precipitation along the High Himalaya together dominate sediment production and transport …
Differential Effects Of Gratitude And Positive Peer Reporting Interventions On Student Subjective Wellbeing, Classroom Behavior, And School Connectedness, Rachel Marie Olinger Steeves
Differential Effects Of Gratitude And Positive Peer Reporting Interventions On Student Subjective Wellbeing, Classroom Behavior, And School Connectedness, Rachel Marie Olinger Steeves
LSU Doctoral Dissertations
Recent research and development in the ever-growing area of systems-level change in schools, including positive behavior interventions and supports (PBIS), school climate, and social-emotional learning (SEL), has stressed the importance in fostering positive outcomes for students. The additional focus on encouraging and promoting positive school-based relationships and cultivating individual student strengths has shown promising outcomes, including higher academic achievement, lower levels of problem behavior, and a greater sense of belonging in schools. However, in some disadvantaged and high-needs school districts, implementing systemic approaches or obtaining the personnel to implement individualized student services can prove exceedingly difficult, namely due to limited …
Design, Synthesis, Characterization And Evaluation Of Near Infrared Bodipy Dyes For Various Applications, Qianli Meng
Design, Synthesis, Characterization And Evaluation Of Near Infrared Bodipy Dyes For Various Applications, Qianli Meng
LSU Doctoral Dissertations
4,4-Difluoro-4-bora-3a,4a-diaza-5-indacene (BODIPY) have drawn a large number of research attention, for its numerous useful application in the fields of material and biology. Small modification of this well-known fluophore has been shown to optimize its photophysical and chemical properties. This work mainly focuses on functionalization of BODIPY cores with halogenated atoms, particularly iodine, and their subsequent post-functionalization reactions, mainly cross-coupling reaction and substitutions, for various further applications. Chapter 1 of this dissertation gives a general overview of BODIPYs including their synthetic strategies, post-functionalization, and how BODIPYs are utilized in many biological applications. Chapter 2 mainly focuses on the synthesis and characterization …
Ex-Companions Of Supernovae Progenitors, Zhichao Xue
Ex-Companions Of Supernovae Progenitors, Zhichao Xue
LSU Doctoral Dissertations
Supernovae (SNe) are titanic explosions that end the life of stars. Fast expanding ejecta can create brightness that is comparable to the entire luminosity of the host galaxy for weeks. Eventually, the ejecta run into the ambient medium, creating the so-called supernova remnant (SNR) that fades away in ~ 10,000 years. SNe come from two completely different mechanisms. The Type Ia SNe (SNIa) are powered by thermonuclear runaway when a white dwarf (WD) in a binary system accretes enough mass from a companion star. The Core Collapse supernovae (CCSNe) are massive stars that run out of fuel at the end …
Condition Of Birds In Amazonian Rainforest Fragments And Second-Growth Forests, Angelica Maria Hernandez Palma
Condition Of Birds In Amazonian Rainforest Fragments And Second-Growth Forests, Angelica Maria Hernandez Palma
LSU Doctoral Dissertations
Deforestation modifies otherwise intact expanses of forest into small, isolated fragments. In addition to fragmentation, deforestation also creates abrupt forest edges and large areas of regenerating vegetation where land is abandoned after clearing. Understanding how changes in the landscape affect the physical condition of birds is crucial for managing populations in human-modified landscapes. Here I use the biomarkers feather growth rate and feather quality (ptilochronology), fluctuating asymmetry (FA), and stress hormones from feathers (CORT), to estimate the physical condition of Amazonian understory birds living in forest fragments, second-growth forests, and continuous forests. Feather CORT revealed how fragmentation disrupts interspecific interactions; …