Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons™

Open Access. Powered by Scholars. Published by Universities.®

Faculty Publications

Discipline
Institution
Keyword
Publication Year
File Type

Articles 1081 - 1110 of 2622

Full-Text Articles in Life Sciences

Influential Herbal And Botanical Texts From The 16th Through 18th Centuries, Michael C. Goates Mar 2016

Influential Herbal And Botanical Texts From The 16th Through 18th Centuries, Michael C. Goates

Faculty Publications

Humans have always had an intimate and complex relationship with plants. Plants provide many of the basic necessities for survival, such as food, clothing, and shelter. Plants also play an important and rich part in human culture. This fascination with plants has led to detailed studies of their natural history as well as explorations into their unique and useful properties. Throughout recorded history, philosophers, herbalists, botanists, and others have captured their observations about plants. From the Middle Ages through the Early Modern Period, herbalists compiled these collective observations into large printed volumes, referred to as herbals. With the Scientific Revolution …

Go to article

Integrative Analyses Reveal Signaling Pathways Underlying Familial Breast Cancer Susceptibility, Stephen R. Piccolo, Laura M. Hoffman, Thomas Conner, Gajendra Shrestha, Adam L. Cohen, Jeffrey R. Marks, Leigh A. Neumayer, Cori A. Agarwal, Mary C. Beckerle, Irene L. Andrulis, Avrum E. Spira, Philip J. Moos, Saundra S. Buys, William Evan Johnson, Andrea H. Bild Mar 2016

Integrative Analyses Reveal Signaling Pathways Underlying Familial Breast Cancer Susceptibility, Stephen R. Piccolo, Laura M. Hoffman, Thomas Conner, Gajendra Shrestha, Adam L. Cohen, Jeffrey R. Marks, Leigh A. Neumayer, Cori A. Agarwal, Mary C. Beckerle, Irene L. Andrulis, Avrum E. Spira, Philip J. Moos, Saundra S. Buys, William Evan Johnson, Andrea H. Bild

Faculty Publications

The signaling events that drive familial breast cancer (FBC) risk remain poorly understood. While the majority of genomic studies have focused on genetic risk variants, known risk variants account for at most 30% of FBC cases. Considering that multiple genes may influence FBC risk, we hypothesized that a pathway‐based strategy examining different data types from multiple tissues could elucidate the biological basis for FBC. In this study, we performed integrated analyses of gene expression and exome‐sequencing data from peripheral blood mononuclear cells and showed that cell adhesion pathways are significantly and consistently dysregulated in women who develop FBC. The dysregulation …

Go to article

Predicting Dissolved Lignin Phenol Concentrations In The Coastal Ocean From Chromophoric Dissolved Organic Matter (Cdom) Absorption Coefficients, Cédric G. Fichot, Ronald Benner, Karl Kaiser, Yuan Shen, Rainer M. W. Amon, Hiroshi Ogawa, Chua-Jung Lu Feb 2016

Predicting Dissolved Lignin Phenol Concentrations In The Coastal Ocean From Chromophoric Dissolved Organic Matter (Cdom) Absorption Coefficients, Cédric G. Fichot, Ronald Benner, Karl Kaiser, Yuan Shen, Rainer M. W. Amon, Hiroshi Ogawa, Chua-Jung Lu

Faculty Publications

Dissolved lignin is a well-established biomarker of terrigenous dissolved organic matter (DOM) in the ocean, and a chromophoric component of DOM. Although evidence suggests there is a strong linkage between lignin concentrations and chromophoric dissolved organic matter (CDOM) absorption coefficients in coastal waters, the characteristics of this linkage and the existence of a relationship that is applicable across coastal oceans remain unclear. Here, 421 paired measurements of dissolved lignin concentrations (sum of nine lignin phenols) and CDOM absorption coefficients [ag(λ)] were used to examine their relationship along the river-ocean continuum (0–37 salinity) and across contrasting coastal oceans (sub-tropical, temperate, high-latitude). …

Go to article

Costs Of Resistance And Infection By A Generalist Pathogen, Tad Dallas, Mathieu Holtackers, John M. Drake Feb 2016

Costs Of Resistance And Infection By A Generalist Pathogen, Tad Dallas, Mathieu Holtackers, John M. Drake

Faculty Publications

Pathogen infection is typically costly to hosts, resulting in reduced fitness. However, pathogen exposure may also come at a cost even if the host does not become infected. These fitness reductions, referred to as “resistance costs”, are inducible physiological costs expressed as a result of a trade-off between resistance to a pathogen and aspects of host fitness (e.g., reproduction). Here, we examine resistance and infection costs of a generalist fungal pathogen (Metschnikowia bicuspidata) capable of infecting a number of host species. Costs were quantified as reductions in host lifespan, total reproduction, and mean clutch size as a function …

Go to article

Incomplete Protection Against Dengue Virus Type 2 Re-Infection In Peru, Brett M. Forshey, Robert C. Reiner, Sandra Olkowski, Amy C. Morrison, Angelica Espinoza, Kanya C. Long, Stalin Vilcarromero, Wilma Casanova, Helen J. Wearing, Eric S. Halsey, Tadeusz J. Kochel, Thomas W. Scott, Steven T. Stoddard Feb 2016

Incomplete Protection Against Dengue Virus Type 2 Re-Infection In Peru, Brett M. Forshey, Robert C. Reiner, Sandra Olkowski, Amy C. Morrison, Angelica Espinoza, Kanya C. Long, Stalin Vilcarromero, Wilma Casanova, Helen J. Wearing, Eric S. Halsey, Tadeusz J. Kochel, Thomas W. Scott, Steven T. Stoddard

Faculty Publications

© 2016 Public Library of Science. All Rights Reserved. Background: Nearly half of the world’s population is at risk for dengue, yet no licensed vaccine or anti-viral drug is currently available. Dengue is caused by any of four dengue virus serotypes (DENV-1 through DENV-4), and infection by a DENV serotype is assumed to provide life-long protection against re-infection by that serotype. We investigated the validity of this fundamental assumption during a large dengue epidemic caused by DENV-2 in Iquitos, Peru, in 2010–2011, 15 years after the first outbreak of DENV-2 in the region. Methodology/Principal Findings: We estimated the age-dependent prevalence …

Go to article

Ambulation Speed And Corresponding Mechanics Are Associated With Changes In Serum Cartilage Oligomeric Matrix Protein, W. Matt Denning, Michael Becker Pardo, Jason G. Winward, Iain Hunter, Sarah T. Ridge, J. Ty Hopkins, C. Shane Reese, Allen C. Parcell, Matthew K. Seeley Feb 2016

Ambulation Speed And Corresponding Mechanics Are Associated With Changes In Serum Cartilage Oligomeric Matrix Protein, W. Matt Denning, Michael Becker Pardo, Jason G. Winward, Iain Hunter, Sarah T. Ridge, J. Ty Hopkins, C. Shane Reese, Allen C. Parcell, Matthew K. Seeley

Faculty Publications

Because serum cartilage oligomeric matrix protein (COMP) has been used to reflect articular cartilage condition, we aimed to identify walking and running mechanics that are associated with changes in serum COMP. Eighteen subjects (9 male, 9 female; age = 23 ± 2 yrs.; mass = 68.3 ± 9.6 kg; height = 1.70 ± 0.08 m) completed 4000 steps on an instrumented treadmill on three separate days. Each day corresponded to a different ambulation speed: slow (preferred walking speed), medium (+50% of slow), and fast (+100% of slow). Synchronized ground reaction force and video data were collected to evaluate walking mechanics. …

Go to article

Biodiversity And You., Garth Woodruff Feb 2016

Biodiversity And You., Garth Woodruff

Faculty Publications

No abstract provided.

Go to article

Lentic And Lotic Habitats As Templets For Fungal Communities: Traits, Adaptations, And Their Significance To Litter Decomposition Within Freshwater Ecosystems, Kevin A. Kuehn Feb 2016

Lentic And Lotic Habitats As Templets For Fungal Communities: Traits, Adaptations, And Their Significance To Litter Decomposition Within Freshwater Ecosystems, Kevin A. Kuehn

Faculty Publications

Decomposition of plant matter is a key ecosystem process and considerable research has examined plant litter decay processes in freshwater habitats. Fungi are common inhabitants of the decomposer microbial community and representatives of all major fungal phyla have been identified within freshwater systems. Development and application of quantitative methods over the last several decades have firmly established that fungi are central players in the decomposition of plant litter in freshwaters and are important mediators of energy and nutrient transfer to higher trophic levels. Despite the critical roles that fungi play in carbon and nutrient cycling in freshwater ecosystems, there are …

Go to article

Three Popular Medicinal Mushroom Supplements: A Review Of Human Clinical Trials, Megan Frost Jan 2016

Three Popular Medicinal Mushroom Supplements: A Review Of Human Clinical Trials, Megan Frost

Faculty Publications

There are many mushroom supplements on the market claiming a variety of health benefits, and it is difficult to discern which of these claims is backed by reliable research. Most of the existing research is conducted using either human cells or animal models rather than human participants. Without being tested directly on humans, this research has limited application. A review of the literature reveals a relatively small number of studies have been conducted using human patients and those that do exist vary widely in study design and quality. This article brings together all the existing studies that involve human participants …

Go to article

Inhibition Of Enterobacter Cloacae And Klebsiella Oxytoca By Garlic (Allium Sativum L.) And Garlic Pills, Lucinda Choules, Dennis A. Gravatt, Stephen M. Kosovich, Wei Yuan, Ping Wang, Ron Havner Jan 2016

Inhibition Of Enterobacter Cloacae And Klebsiella Oxytoca By Garlic (Allium Sativum L.) And Garlic Pills, Lucinda Choules, Dennis A. Gravatt, Stephen M. Kosovich, Wei Yuan, Ping Wang, Ron Havner

Faculty Publications

Multidrug resistant infections and superinfections are increasing globally. Intrinsic and acquired resistance to multiple antibiotics by bacteria from the Enterobacteriaceae family exasperate treatment efforts by clinicians. Carbapenem antibiotics were once relied upon to treat multidrug resistant infections. However, Carbapenem Resistant Enterobacteriaceae (CRE) infections are becoming more common, requiring that an alternative treatment be found. This study trialed an ancient cure, Fresh Garlic Extract (FGE) created from garlic (Allium sativum L.) and commercially prepared garlic pills against two opportunistic Enterobacteriaceae in vitro utilizing: disc diffusion, well diffusion (introducing DIFF-bolts), and HPLC. FGE and four brands of garlic pills inhibited the growth …

Go to article

Accuracy Assessment Of Pictometry® Height Measurements Stratified By Cardinal Direction And Image Magnification Factor, Daniel Unger, David Kulhavy, I-Kuai Hung, Yanli Zhang Jan 2016

Accuracy Assessment Of Pictometry® Height Measurements Stratified By Cardinal Direction And Image Magnification Factor, Daniel Unger, David Kulhavy, I-Kuai Hung, Yanli Zhang

Faculty Publications

The aim of this project was to ascertain if Pictometry® estimated height could be used in lieu of field-based height estimation. Height of a light pole measured with a telescopic height pole was compared to Pictometry® hyperspatial 4-inch (10.2 centimeters) multispectral imagery estimated light pole height on the campus of Stephen F. Austin State University, Nacogdoches, Texas. Average percent agreement between light pole height and Pictometry® estimated light pole height summarized by Pictometry® image magnification factors at 100%, 125%, 150%, 200%, and 300% magnification were within 98% of light pole height with percent disagreement ranging from …

Go to article

Expansion Of The Manage Database With Forest And Drainage Studies, Daren R. Harmel, Laura E. Christianson, Matthew W. Mcbroom, Douglas R. Smith, Kori D. Higgs Jan 2016

Expansion Of The Manage Database With Forest And Drainage Studies, Daren R. Harmel, Laura E. Christianson, Matthew W. Mcbroom, Douglas R. Smith, Kori D. Higgs

Faculty Publications

The “Measured Annual Nutrient loads from AGricultural Environments” (MANAGE) database was published in 2006 to expand an early 1980s compilation of nutrient export (load) data from cultivated and pasture/range land at the field or farm scale. Then in 2008, MANAGE was updated with 15 additional studies, and nitrogen (N) and phosphorus (P) concentrations in runoff were added. Since then, MANAGE has undergone significant expansion adding N and P water quality along with relevant management and site characteristic data from: (1) 30 runoff studies from forested land uses, (2) 91 drainage water quality studies from drained land, and (3) 12 additional …

Go to article

Quality And Yield Of Seven Forages Grown Under Partial Shading Of A Simulated Silvopastoral System In East Texas, J. Hill, K. Farrish, B. Oswald, L. Young, A. Shadow Jan 2016

Quality And Yield Of Seven Forages Grown Under Partial Shading Of A Simulated Silvopastoral System In East Texas, J. Hill, K. Farrish, B. Oswald, L. Young, A. Shadow

Faculty Publications

The goal of this project is to evaluate the growth and nutritional characteristics of seven forages, including various warm season native grasses, grown under simulated partial shading (50 percent typical of a loblolly pine silvopastoral system in east Texas. The results are from year two of a three year study. In order to meet the overall objective, individual, slatted shade structures were constructed that simulate the quantity, quality, and overall light regime found beneath loblolly pine stands arranged for silvopasture. The forages selected for the study include ‘Tifton 9’ bahiagrass (Paspalum notatum), ‘Tifton 85’ bermudagrass (Cynodon dactylon), ‘Alamo’ switchgrass (Panicum …

Go to article

Road-Edge Effects On Herpetofauna In A Lowland Amazonian Rainforest, Ross J. Maynard, Nathalie C. Aall, Daniel Saenz, Paul S. Hamilton, Matthew Kwiatkowski Jan 2016

Road-Edge Effects On Herpetofauna In A Lowland Amazonian Rainforest, Ross J. Maynard, Nathalie C. Aall, Daniel Saenz, Paul S. Hamilton, Matthew Kwiatkowski

Faculty Publications

The impact of roads on the flora and fauna of Neotropical rainforest is perhaps the single biggest driver of habitat modification and population declines in these ecosystems. We investigated the road-edge effect of a low-use dirt road on amphibian and reptile abundance, diversity, and composition within adjacent lowland Amazonian rainforest at San José de Payamino, Ecuador. The road has been closed to vehicle traffic since its construction in 2010. Thus, effects from vehicle mortality, vehicle-related pollution, and road noise were not confounding factors. Herpetofauna were surveyed using both visual encounter surveys and drift fences with pitfall and funnel traps at …

Go to article

A Technique Of Improved Medial Meniscus Visualization By Anterior Cruciate Ligament Graft Placement In Chronic Anterior Cruciate Deficient Knees, Christopher J. Vertullo, Lahann Wijenayake, Jane E. Grayson Jan 2016

A Technique Of Improved Medial Meniscus Visualization By Anterior Cruciate Ligament Graft Placement In Chronic Anterior Cruciate Deficient Knees, Christopher J. Vertullo, Lahann Wijenayake, Jane E. Grayson

Faculty Publications

It is customary to perform medial meniscus repair before anterior cruciate ligament (ACL) graft placement when undertaken as a combined procedure. However, in chronic ACL-deficient knees, intraoperative anterior tibiofemoral translation can cause the medial meniscus repair to be more technically challenging. Intraoperative anterior tibiofemoral translation can both reduce the visualization of the medial meniscus and make its reduction unstable. An operative sequence alteration of ACL graft placement and tensioning before medial meniscal repair improves medial meniscus visualization in chronically ACL-deficient knees by using the ACL graft’s ability to prevent anterior tibiofemoral translation. The technique sequence is as follows: (a) the …

Go to article

Effects Of Service-Learning On Kinesiology Students' Attitudes Toward Children With Disabilities, José Santiago, Jihyun Lee, Emily Roper Jan 2016

Effects Of Service-Learning On Kinesiology Students' Attitudes Toward Children With Disabilities, José Santiago, Jihyun Lee, Emily Roper

Faculty Publications

Contact theory (Allport, 1954) served as the framework to investigate undergraduate kinesiology students’ attitudes toward children with disabilities after a service-learning (SL) experience. Fifty-one undergraduate kinesiology students enrolled in an adapted physical education (APE) course served as the experimental group, and 31 undergraduate kinesiology students enrolled in an introductory kinesiology course served as the control group. The Attitudes Toward Disabled Persons Scale–Form A (Yuker, Block, & Younng, 1970) was administered at three different times: before, during, and after the SL. A mixed-design ANOVA revealed that there were no statistically significant main or interaction effects for gender, group, and time on …

Go to article

Characterization Of The Three Zebrafish Orthologs Of The Mitochondrial Gtpase Miro/Rhot, Brittany M. Hollister, Kelsey A. Oonk, Douglas C. Weiser, Susan Walsh Jan 2016

Characterization Of The Three Zebrafish Orthologs Of The Mitochondrial Gtpase Miro/Rhot, Brittany M. Hollister, Kelsey A. Oonk, Douglas C. Weiser, Susan Walsh

Faculty Publications

Mitochondria exhibit dynamic locomotion and spatial rearrangement. This movement is necessary for a cell to maintain basic metabolic functions, and disruption of motility often results in cell death. Miro is a mitochondrial outer membrane Rho GTPase essential for mitochondrial movement and distribution in diverse systems, including yeast, animals, and plants. We sought to study the previously uncharacterized Miro protein family in zebrafish. We confirmed that, like human Miro, the zebrafish Miro proteins (Rhot1a, Rhot1b, and Rhot2) localize to mitochondria in mammalian tissue culture cells by both biochemical fractionation and immunofluorescent colocalization. In addition, using whole mount in situ hybridization, we …

Go to article

High Throughput Genomic Sequencing Of Bioaerosols In Broiler Chicken Production Facilities, Kate M. O’Brien, Michael S. Chimenti, Morgan Farnell, Tom Tabler, Thomas Bair, Joey Lynn Bray, Matthew W. Nonnenmann Jan 2016

High Throughput Genomic Sequencing Of Bioaerosols In Broiler Chicken Production Facilities, Kate M. O’Brien, Michael S. Chimenti, Morgan Farnell, Tom Tabler, Thomas Bair, Joey Lynn Bray, Matthew W. Nonnenmann

Faculty Publications

Chronic inhalation exposure to agricultural dust promotes the development of chronic respiratory diseases among poultry workers. Poultry dust is composed of dander, chicken feed, litter bedding and microbes. However, the microbial composition and abundance has not been fully elucidated. Genomic DNA was extracted from settled dust and personal inhalable dust collected while performing litter sampling or mortality collection tasks. DNA libraries were sequenced using a paired-end sequencing-by-synthesis approach on an Illumina HiSeq 2500. Sequencing data showed that poultry dust is predominantly composed of bacteria (64–67%) with a small quantity of avian, human and feed DNA (< 2% of total reads). Staphylococcus sp. AL1, Salinicoccus carnicancri and Lactobacillus crispatus were the most abundant bacterial species in personal exposure samples of inhalable dust. Settled dust had a moderate relative abundance of these species as well as Staphylococcus lentus and Lactobacillus salivarius. There was a statistical difference between the microbial composition of aerosolized and settled dust. Unlike settled dust composition, aerosolized dust composition had little variance between samples. These data provide an extensive analysis of the microbial composition and relative abundance in personal inhalable poultry dust and settled poultry dust.

Go to article

Habitat Use And Avoidance By Foraging Red-Cockaded Woodpeckers In East Texas, John N. Macey, Brent Burt, Daniel Saenz, Richard N. Conner Jan 2016

Habitat Use And Avoidance By Foraging Red-Cockaded Woodpeckers In East Texas, John N. Macey, Brent Burt, Daniel Saenz, Richard N. Conner

Faculty Publications

Picoides borealis (Red-cockaded Woodpecker) is an endangered bird endemic to the Pinus (pine) ecosystems of the southeastern US. Mature pine savannahs with a minimal midstory and lush herbaceous groundcover represent high-quality habitat. This study examines the foraging-habitat patterns of Red-cockaded Woodpeckers in East Texas. We present a logistic regression model that best differentiates between foraged and non-foraged habitat. Increases in hardwood-midstory basal area have the greatest negative impact on the probability of Red-cockaded Woodpeckers selecting a habitat patch for foraging. Five additional variables negatively impact foraging probability: shrub height, diameter at breast height (DBH) of pine midstory, canopy closure, density …

Go to article

Water Soluble Cationic Porphyrin Sensor For Detection Of Hg2+, Pb2+, Cd2+, And Cu2+, Matibur Zamadar, Christopher Orr, Miranda Uherek Jan 2016

Water Soluble Cationic Porphyrin Sensor For Detection Of Hg2+, Pb2+, Cd2+, And Cu2+, Matibur Zamadar, Christopher Orr, Miranda Uherek

Faculty Publications

Here we report the sensing properties of the aqueous solution of meso-tetra(N-methyl-4-pyridyl)porphine tetrachloride (1) for simultaneous detection of toxic metal ions by using UV-vis spectroscopy. Cationic porphyrin 1 displayed different electronic absorptions in UV-vis region upon interacting with Hg2+, Pb2+, Cd2+, and Cu2+ ions in neutral water solution at room temperature. Quite interestingly, the porphyrin 1 showed that it can function as a single optical chemical sensor and/or metal ion receptor capable of detecting two or more toxic metal ions, particularly Hg2+, Pb2+, and Cd2+ ions coexisting in a water sample. Porphyrin 1 in an aqueous solution provides a unique …

Go to article

Forage Yields In Turkey Hill Wilderness In East Texas For White-Tailed Deer, Brian P. Oswald, Kenneth W. Farrish, Bret Gentzler Jan 2016

Forage Yields In Turkey Hill Wilderness In East Texas For White-Tailed Deer, Brian P. Oswald, Kenneth W. Farrish, Bret Gentzler

Faculty Publications

Wilderness areas are often considered quality areas where natural processes occur without human activity. It is often assumed that these unmanaged areas will provide and support quality wildlife habitat. The objective of this study was to evaluate the forage production and stocking potential of an unmanaged wilderness area in east Texas. Four different community types were evaluated for forage yield, forage availability, and browse utilization for white-tailed deer. Results show that although a wide range of forage yields were measured in the spring, summer forage yield did not differ among the various communities. Availability also differed between community types, but …

Go to article

Vegetative Community Development Over 30 Years Within Mixed Pine-Hardwood Mine Reclamation Sites In East Texas, Christy Christian, Brian P. Oswald, Hans M. Williams, Kenneth W. Farrish Jan 2016

Vegetative Community Development Over 30 Years Within Mixed Pine-Hardwood Mine Reclamation Sites In East Texas, Christy Christian, Brian P. Oswald, Hans M. Williams, Kenneth W. Farrish

Faculty Publications

The practice of mine reclamation aims to balance the energy needs of society with proactive environmental restoration of degraded land, and long-term studies of vegetative community development on reclaimed mine land have been invaluable in developing effective reclamation practices. This study investigated vegetative community characteristics (composition, richness, species importance)over a 30 year time frame in planted mixed pine-hardwood areas on reclaimed surface coal mine land in East Texas,United States. Reclaimed sites werecompared vegetatively to unmined reference forests. A chronological pattern wasshown for reclaimedcommunity developmentin both understory and overstorystrata. Understory community development exhibitednatural patterns, while theoverstory community varied with different groups …

Go to article

Overstory Tree Mortality In The Ponderosa Pine And Spruce-Fir Ecosystems, Following A Drought In Northern New Mexico, Brian P. Oswald, Sean Dugan, Randy Balice, Daniel Unger Jan 2016

Overstory Tree Mortality In The Ponderosa Pine And Spruce-Fir Ecosystems, Following A Drought In Northern New Mexico, Brian P. Oswald, Sean Dugan, Randy Balice, Daniel Unger

Faculty Publications

Drought-caused tree dieback is an issue around the world as climates change and many areas become dryer and hotter. A drought from 1998-2004 resulted in a significant tree dieback event in many of the wooded areas in portions of the Jemez Mountains and the adjacent Pajarito Plateau in northern New Mexico. The objectives of this study were to evaluate and quantify the differences in tree mortality before and after a recent drought in the ponderosa pine and spruce-fir ecosystems, and to assess the effect of mechanical thinning on ponderosa pine mortality. Significant increases in mortality were observed in the unthinned …

Go to article

Comparing Remotely Sensed Pictometry® Web Based Slope Distance Estimates With In Situ Total Station And Tape Slope Distance Estimates, David Kulhavy, Daniel Unger, Yanli Zhang, Phillip Bedford, I-Kuai Hung Jan 2016

Comparing Remotely Sensed Pictometry® Web Based Slope Distance Estimates With In Situ Total Station And Tape Slope Distance Estimates, David Kulhavy, Daniel Unger, Yanli Zhang, Phillip Bedford, I-Kuai Hung

Faculty Publications

Slope distance was measured between the top of 30 light poles and their respective ground level coordinate identified within a central parking lot on the campus of Stephen F. Austin State University, Nacogdoches, Texas. Slope distance measured using Pictometry® hyperspatial 4-inch (10.2 centimeters) multispectral imagery within a web based interface was compared to in situ total station and tape measured slope distance. The range for mean slope distance for Pictometry®, total station, and tape measured slope distance was 0.05 meters. Mean slope distance was 15.36 meters, 15.37 meters, and 15.41 meters for Pictometry®, total station, …

Go to article

Incorporating Applied Undergraduate Research In Senior To Graduate Level Remote Sensing Courses, Richard Henley, Daniel Unger, David Kulhavy, I-Kuai Hung Jan 2016

Incorporating Applied Undergraduate Research In Senior To Graduate Level Remote Sensing Courses, Richard Henley, Daniel Unger, David Kulhavy, I-Kuai Hung

Faculty Publications

An Arthur Temple College of Forestry and Agriculture (ATCOFA) senior spatial science undergraduate student engaged in a multi-course undergraduate research project to expand his expertise in remote sensing and assess the applied instruction methodology employed within ATCOFA. The project consisted of performing a change detection land-use/land-cover classification for Nacogdoches and Angelina counties in Texas using satellite imagery. The dates for the imagery were spaced approximately ten years apart and consisted of four different acquisitions between 1984 and 2013. The classification procedure followed and expanded upon a series of concrete theoretical remote sensing principles, transforming the four remotely sensed raster images …

Go to article

Effects Of First Thinning On Growth Of Loblolly Pine Plantations In The West Coastal Plain, Dean W. Coble, Jason Grogan Jan 2016

Effects Of First Thinning On Growth Of Loblolly Pine Plantations In The West Coastal Plain, Dean W. Coble, Jason Grogan

Faculty Publications

The purpose of this research is to analyze thinning response in basal area and height growth of residual loblolly pine trees growing in plantations located in the West Gulf Coastal Plain. Thinning is a well-known silvicultural practice that increases the growing space available to desirable trees by removing competing trees.

Go to article

Use Of A Portable Sawmill For Forestry Instruction, Matthew Mcbroom, David Kulhavy, Jeremy Stovall, Ryan P. Grisham Jan 2016

Use Of A Portable Sawmill For Forestry Instruction, Matthew Mcbroom, David Kulhavy, Jeremy Stovall, Ryan P. Grisham

Faculty Publications

The Arthur Temple College of Forestry and Agriculture at Stephen F. Austin State University in Nacogdoches, TX, has implemented an experiential learning exercise to improve student learning related to the forest products industry. During the week-long sophomore- or junior-level course Harvesting and Processing, forestry students tour multiple wood products facilities such as sawmills. These mills use complex technologies to maximize the lumber produced from each log, and students were having difficulty understanding the underlying concepts. As part of this course beginning in 2012, students began working in teams to estimate the lumber that will be recovered from a log and …

Go to article

Evaluating Interactive Transect Area Assessments Hands-On Instruction For Natural Resource Undergraduate Students, Daniel Unger, Sarah Schwab, Ryan Jacques, Yanli Zhang, I-Kuai Hung, David L. Kulhavy Jan 2016

Evaluating Interactive Transect Area Assessments Hands-On Instruction For Natural Resource Undergraduate Students, Daniel Unger, Sarah Schwab, Ryan Jacques, Yanli Zhang, I-Kuai Hung, David L. Kulhavy

Faculty Publications

Undergraduate students pursuing a Bachelor of Science in Spatial Science degree at Stephen F. Austin State University (SFASU) receive instruction in the spatial sciences with a focus on hands-on applications. All undergraduate students take the course Introduction to Spatial Science which includes a comprehensive overview of spatial science incorporating a comparison of standard inexpensive area assessment techniques with high-end computer based area assessment methodologies. Students within this course were instructed how to assess the area of a surface feature on an aerial image with a ruler applying the transect method. Student's average Root Mean Square Error (RMSE) between a student's …

Go to article

Spatial Distribution Of Earthworms In An East Texas Forest Ecosystem, Melissa A. Bozarth, Kenneth W. Farrish, George A. Damoff, James Van Kley, J. Leon Young Jan 2016

Spatial Distribution Of Earthworms In An East Texas Forest Ecosystem, Melissa A. Bozarth, Kenneth W. Farrish, George A. Damoff, James Van Kley, J. Leon Young

Faculty Publications

Earthworms were collected and identified in different ecological habitats of the Stephen F. Austin Experimental Forest (SFAEF) in the Piney Woods Ecoregion (PWE) of Texas. Earthworm spatial distribution data were collected over four distinct ecological habitats with a range of soil conditions and vegetative cover. A total of 128 sampling plots were surveyed in two different, broadly defined locations (mesic slope = 68 plots, dry-mesic upland = 60 plots). Using multivariate classification/ordination (TWINSPAN) and detrended correspondence analysis (DCA) of overstory vegetation data, these two locations were further divided into four distinct habitats: dry-mesic mixed upland, transitional zone, mesic slope and …

Go to article

Henson Et Al Supplementary Figure 1.Pdf, Shandelle Henson Jan 2016

Henson Et Al Supplementary Figure 1.Pdf, Shandelle Henson

Faculty Publications

Supplementary Figure 1 | Sample plots on Violet Point, Protection Island National WildlifeRefuge, Washington, USA. The larger colony extends throughout much of the spit.

Go to article

First Prev Next Last