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

Life Sciences Commons™

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

2006

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 2941 - 2970 of 3150

Full-Text Articles in Life Sciences

Physical Activity Behavior Of University Students: An Ecological Approach, Lisa Gaye Johnson Jan 2006

Physical Activity Behavior Of University Students: An Ecological Approach, Lisa Gaye Johnson

LSU Doctoral Dissertations

Despite the health benefits associated with active lifestyles, a majority of adults do not engage in sufficient levels of physical activity (PA). Few individual-focused interventions have produced sustained changes in PA behavior. Therefore, public health officials are promoting the use of ecological approaches to examine the multidimensional factors that influence choices about PA and other health behaviors. National statistics are mirrored in college populations, with one-half of students in the US failing to meet current PA recommendations and one-third classified as either overweight or obese. In light of this, increasing PA and obesity prevention have been identified as the top …

Go to article

Evaluation Of A Plasmid Delivery System For Production Of Gnrh And Ghrh In The Horse And Goat, William Andrew Storer Jan 2006

Evaluation Of A Plasmid Delivery System For Production Of Gnrh And Ghrh In The Horse And Goat, William Andrew Storer

LSU Doctoral Dissertations

The efficacy of a novel plasmid delivery system was assessed for long-term expression of gonadotropin releasing hormone (GnRH) and growth hormone releasing hormone (GHRH) in horses and goats. The efficacy of the technology was demonstrated using 3 novel plasmids: pSEAP [expressing secreted embryonic alkaline phosphatase (SEAP)], pGHRH (expressing GHRH), and pGnRH (expressing GnRH). Geldings were electroporated with a reporter plasmid expressing SEAP in 3 muscle sites. Expression of SEAP, measured from jugular plasma samples, indicated muscle specificity for uptake and expression of the plasmid. Concentrations of SEAP were greatest (P < 0.05) after pectoralis injection, which was chosen as the site for electroporation in subsequent studies. In a second experiment, stallions were electroporated with pGHRH or pSEAP to evaluate the effect of long-term GHRH treatment on the growth hormone (GH) axis and testicular function. Stallions treated with pGHRH had increased (P < 0.05) plasma concentrations of IGF-I, increased (P < 0.05) volume of accessory sex gland fluid, and increased (P < 0.05) number of normal spermatozoa in the ejaculate relative to controls. In the third experiment, stallions were electroporated with pGnRH or pSEAP to test the effects of GnRH on the reproductive axis. Treatment with pGnRH increased (P < 0.05) plasma testosterone concentrations to d 56 and increased (P < 0.01) the LH response to GnRH on d 21, but did not alter (P > 0.1) seminal characteristics evaluated after 36 d of treatment. In …

Go to article

College Student's Motivation For Physical Activity, Lori Lynn Delong Jan 2006

College Student's Motivation For Physical Activity, Lori Lynn Delong

LSU Doctoral Dissertations

The purpose of this study was to examine college students' motivations to be physically active by merging the perspectives of self-determination theory and the transtheoretical model. The secondary purpose was to examine the effects of a required physical activity course on college students' levels of physical activity. The premise is that both the theory and model can be used to help predict physical activity outcomes. Participants were 277 male and female students at a small private college. Motivation, self-determination, stage of change, self-efficacy, decisional balance, and leisure time activity levels were assessed using an online survey. Results revealed that activity …

Go to article

Self-Determination In Physical Education: Designing Class Environments To Promote Active Lifestyles, Charity Leigh Bryan Jan 2006

Self-Determination In Physical Education: Designing Class Environments To Promote Active Lifestyles, Charity Leigh Bryan

LSU Doctoral Dissertations

The purpose of this study was to investigate the relationships between self-determination, perceptions of the motivational climate, attitude, perceived ability, engagement in physical activity, and health-related fitness indicators. Two structural models related to engagement/intention to engage in physical activity and health-related fitness were tested. The premise of both models is that perceived competence predicts the outcome variables (engagement or health-related fitness), with self-determination, attitude, and motivational climate predicting perceived competence. Participants were 827 sixth, seventh, and eighth graders. Motivation, perceptions of the climate, attitude, perceived competence, and self-reported physical activity levels were assessed using surveys. Pedometers were used to record …

Go to article

Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto Jan 2006

Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto

LSU Doctoral Dissertations

Previous studies on market power hypothesis strictly assumed that the data used in the analysis were a stationary process. This assumption has been argued that not all time series exhibit a stationary process such that conventional asymptotic theory cannot be applied. This study adopts the “New Empirical Industrial Organization” (NEIO) approach developed by Bresnahan (1982) and Lau (1982) to measure the degree of market power in the export market for soybean complex. The non-stationary properties of the data were accommodated by formulating the model in an error correction framework (ECM) developed by Bårdsen (1989) and applied by Steen and Salvanes …

Go to article

Assessment Of Interactions Amoung Viruses Infecting Sweetpotato, Charalambos D. Kokkinos Jan 2006

Assessment Of Interactions Amoung Viruses Infecting Sweetpotato, Charalambos D. Kokkinos

LSU Doctoral Dissertations

Viral diseases, especially those caused by mixed infections, are among the economically most important diseases of sweetpotato. Real-time PCR assays were developed for the detection and quantification of the potyviruses Sweet potato feathery mottle virus (SPFMV), Sweet potato virus G (SPVG), Ipomoea vein mosaic virus (IVMV); the crinivirus Sweet potato chlorotic stunt virus (SPCSV), and the begomovirus Sweet potato leaf curl virus (SPLCV) directly from infected sweetpotato plants. Titers of SPFMV, IVMV, and SPVG were lower in singly-infected sweetpotato plants compared to singly-infected plants of the standard indicator host Brazilian morning-glory (Ipomoea setosa) and the standard propagation host I. nil …

Go to article

Biomechanical Characteristics Of Low Back Tissues During Trunk Flexion-Extension, Michael William Olson Jan 2006

Biomechanical Characteristics Of Low Back Tissues During Trunk Flexion-Extension, Michael William Olson

LSU Doctoral Dissertations

Analysis of the mechanical and neural regulatory mechanisms of the flexion-relaxation phenomenon (FRP), observed in deep trunk flexion, was performed since it is believed these mechanisms provide insight into the causes of low back injury and pain. Three methods were used to analyze the behavior of the lumbar tissues during trunk flexion-extension exercises: 1) active continuous cyclic movement, 2) acute cyclic movement at different orientations, and 3) passive continuous cyclic movement. All activities were performed at a rate of 0.1 Hz (6 cycles•min-1) while monitoring the surface electromyography (EMG) of the lumbar paraspinal muscles. Abdominal, hamstring, and quadriceps muscle activities …

Go to article

Detection And Survival Of Escherichia Coli O157:H7 In Cattle Water Troughs And The Effects Of Cetylpyridinium Chloride Against Escherichia Coli O157:H7 Biofilms On The Surface Of Stainless Steel, Sajida Begum Plauche Jan 2006

Detection And Survival Of Escherichia Coli O157:H7 In Cattle Water Troughs And The Effects Of Cetylpyridinium Chloride Against Escherichia Coli O157:H7 Biofilms On The Surface Of Stainless Steel, Sajida Begum Plauche

LSU Doctoral Dissertations

Escherichia coli O157:H7 is an emerging food pathogen that was first identified as a cause of illness in 1982. According to CDC (The Center for Disease Control and Prevention) estimates, E. coli O157:H7 is responsible for about 73,000 illnesses, 2,000 hospitalizations and 60 deaths in the United States each year. Cattle are the principal reservoir of E. coli O157:H7. Contamination of feed and drinking water with cattle feces is an importance factor in the prevalence of infection in cattle which, in turn, results in contamination of food and the environment. Escherichia coli O157:H7 is a very persistent pathogen and has …

Go to article

The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han Jan 2006

The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han

LSU Doctoral Dissertations

This study investigates the effects of risk/benefit beliefs on consumer purchase intentions for genetically modified (GM) foods. A random, national, mail survey is conducted. Three main problems are addressed in the study. The first problem addressed is to analyze the relationship between consumers risk/ benefit beliefs regarding GM foods, and their willingness to buy GM crop and meat products. The second problem deals with linkages between a consumer’s risk/benefit beliefs about GM foods and willingness to pay (WTP) for GM foods with a benefit disclosure. The third problem addressed is to test a causal relationship between knowledge and trust toward …

Go to article

Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat Jan 2006

Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat

LSU Doctoral Dissertations

Biological resource banking is becoming important for endangered species conservation. A series of experiments were conducted to address issues concerning collection and utilization of biomaterials from Gulf Coast Native (GCN) sheep (model species) (Ovis aries) and Eland antelope (Taurotragus oryx). In the first experiment, two ejaculates were collected 10 minutes apart from each of five rams three times a week for three weeks to maximize output and minimize handling time. Semen volume, concentration and total number of spermatozoa were significantly greater in first ejaculates, whereas pre-cooled, cooled and post-thaw motility, as well as sperm survival, were greater in second ejaculates. …

Go to article

Characterizing An Rna Aptamer And Binding Studies With Synthetic Porphyrazines, Melanie Bozza Jan 2006

Characterizing An Rna Aptamer And Binding Studies With Synthetic Porphyrazines, Melanie Bozza

Seton Hall University Dissertations and Theses (ETDs)

.

Go to article

Relation Of Riparian Buffer Strips To In-Stream Habitat, Macroinvertebrates And Fish In A Small Iowa Stream, Jeremy P. Duehr, Michael J. Siepker, Clay L. Pierce, Thomas M. Isenhart Jan 2006

Relation Of Riparian Buffer Strips To In-Stream Habitat, Macroinvertebrates And Fish In A Small Iowa Stream, Jeremy P. Duehr, Michael J. Siepker, Clay L. Pierce, Thomas M. Isenhart

Journal of the Iowa Academy of Science: JIAS

Macroinvertebrate and fish habitat is often degraded as a result of agriculture. Riparian buffer strips are commonly used to counteract the negative effects of agriculture in headwater streams. We assessed the relation of multi-aged riparian buffer strips to in-stream habitat, macroinvertebrate and fish assemblages in an Iowa stream. In-stream habitat, macroinvertebrates, and fish were sampled from two buffered sites and two unbuffered sites, with the greatest substrate, water depth, and velocity heterogeneity occurring in buffered sites. The highest macroinvertebrate richness (11) as well as fish species richness (14), diversity (1.99) and IBI score (3 7) were found in the site …

Go to article

Research Plan And Preliminary Results - A Field Research Site For Emerging Contaminants In Iowa, Douglas J. Schnoebelen, Dana W. Kolpin, Larry B. Barber, Edward T. Furlong, Michael M. Meyer, Mary Skopec Jan 2006

Research Plan And Preliminary Results - A Field Research Site For Emerging Contaminants In Iowa, Douglas J. Schnoebelen, Dana W. Kolpin, Larry B. Barber, Edward T. Furlong, Michael M. Meyer, Mary Skopec

Journal of the Iowa Academy of Science: JIAS

Research has recently documented the prevalence of a wide variety of pharmaceuticals and other emerging contaminants (ECs) in streams across the United States. Wastewater treatment plants (WWTPs) have been found to be an important source and collection point of ECs to streams as many ECs are incompletely removed during treatment. To investigate the complex instream processes (e.g., dilution, sorption, degradation, dispersion, etc.) chat can affect ECs following their input from a WWTP and determining if such input is having an effect on the aquatic ecosystem requires the integration of multi-disciplinary efforts at a carefully selected field site. Preliminary work has …

Go to article

Cover - Table Of Contents Jan 2006

Cover - Table Of Contents

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Go to article

The Honey Creek Member: A New Holocene Alluvial Stratigraphic Unit In The Midwest, Jeremy S. Dillon, Rolfe D. Mandel Jan 2006

The Honey Creek Member: A New Holocene Alluvial Stratigraphic Unit In The Midwest, Jeremy S. Dillon, Rolfe D. Mandel

Journal of the Iowa Academy of Science: JIAS

This paper describes the type locality and type section for the Honey Creek Member, a stratigraphic unit first recognized in the Honey Creek drainage in southeastern Nebraska. The alluvial chronology for Honey Creek basin is similar to the regional chronology of streams in the Midwest, and all of the formal members of the DeForest Formation occur in the basin. However, the lithology of one unit, the Honey Creek Member, does not correlate with any of the formally recognized members of the DeForest Formation. The Honey Creek Member is composed of grayish brown silt loam overbank facies coarsening downward to a …

Go to article

Silicification Of Corals, Stromatoporids, And Brachiopods At The Weathered Surface Within The Devonian-Age Little Cedar Formation (Solon And Rapid Members) In Eastern Iowa, Adam L. Majeski, Paul L. Garvin Jan 2006

Silicification Of Corals, Stromatoporids, And Brachiopods At The Weathered Surface Within The Devonian-Age Little Cedar Formation (Solon And Rapid Members) In Eastern Iowa, Adam L. Majeski, Paul L. Garvin

Journal of the Iowa Academy of Science: JIAS

Diagenesis of fossils contained in middle-Devonian limestones was studied at the Troy Mills and Robins quarries in Linn County, Iowa and at the Four County and Ernst quarries in Johnson County, Iowa. Fossils located at weathered bedrock surfaces were preferentially silicified, and the silicification affected corals, stromatoporids and, to a limited extent, brachiopods, but not other fossils or the host rock. The siliceous horizon extends no more than a few centimeters below the weathered surfaces, suggesting that silicification was constrained by them. Silica for silicification might have come from a variety of sources, including sponge spicules or radiolarian tests, insoluble …

Go to article

Relation Of Riparian Buffer Strips To In-Stream Habitat, Macroinvertebrates And Fish In A Small Iowa Stream, Jeremy P. Duehr, Michael J. Siepker, Clay L. Pierce, Thomas M. Isenhart Jan 2006

Relation Of Riparian Buffer Strips To In-Stream Habitat, Macroinvertebrates And Fish In A Small Iowa Stream, Jeremy P. Duehr, Michael J. Siepker, Clay L. Pierce, Thomas M. Isenhart

Journal of the Iowa Academy of Science: JIAS

Macroinvertebrate and fish habitat is often degraded as a result of agriculture. Riparian buffer strips are commonly used to counteract the negative effects of agriculture in headwater streams. We assessed the relation of multi-aged riparian buffer strips to in-stream habitat, macroinvertebrate and fish assemblages in an Iowa stream. In-stream habitat, macroinvertebrates, and fish were sampled from two buffered sites and two unbuffered sites, with the greatest substrate, water depth, and velocity heterogeneity occurring in buffered sites. The highest macroinvertebrate richness (11) as well as fish species richness (14), diversity (1.99) and IBI score (37) were found in the site buffered …

Go to article

Water Stress Vulnerability Of Four Banksia Species In Contrasting Ecohydrological Habitats On The Gnangara Mound, Western Australia, Caroline Canham Jan 2006

Water Stress Vulnerability Of Four Banksia Species In Contrasting Ecohydrological Habitats On The Gnangara Mound, Western Australia, Caroline Canham

Theses : Honours

The distribution of obligate and facultative phreatophytic vegetation reflects the gradient of ecohydrological habitats in a landscape. Preliminary investigations of Banksia vulnerability to xylem embolism have reported that obligate phreatophytes are more susceptible to water stress than facultative phreatophytes (Froend & Drake 2006). A quantitative measure of plant susceptibility to water stress is vital when establishing environmental water requirements. This study investigated interspecific differences in vulnerability to water stress for two facultative phreatophytes (B. attenuata and B. menziesii) and two obligate pln·eatophytes (B. ilicifolia and B. littoralis) at the same position along an ecohydrological gradient on the Gnangara Groundwater Mound, …

Go to article

Determining Carbon And Nitrogen Stable Isotope Discrimination For Marine Consumers, Emily N. Gates Jan 2006

Determining Carbon And Nitrogen Stable Isotope Discrimination For Marine Consumers, Emily N. Gates

Theses : Honours

The application of stable isotope ratios to food web studies is increasing, and the use of generalised discrimination values (0.4±1.4%0 for δ13C and 3.4±1.1%0 for δ15N), which are being widely applied to many studies, may not be valid. The broad objective of this study was to evaluate the assumption that these discrimination values are applicable to a range of benthic marine consumers, and therefore appropriate to be used in trophic analyses using carbon (C) and nitrogen (N) stable isotopes in marine food webs. The first aim was to determine if there were differences in …

Go to article

The Functional Significance Of Multiple Pax7 Isoforms, Chantel L. Burchill Jan 2006

The Functional Significance Of Multiple Pax7 Isoforms, Chantel L. Burchill

Theses : Honours

The Pax7 gene is critical for specification of both neurons in the mid-brain and skeletal muscle satellite cells. Several alternate transcripts are transcribed from the single gene. Previous studies have shown that the resultant alternate Pax7 isoforms differ in the structure of their paired domain (a DNA-binding domain that influences target gene selection), yet the functional significance of each isoform for specification of neurogenic and myogenic cell types remains unknown. Although previous studies have identified the presence of multiple alternate Pax7 transcripts in both neurogenic and myogenic cell lines, more research is necessary to understand the functional significance of the …

Go to article

The Effectiveness Of A Home-Based, Patient-Specific, Functional Exercise Program On Patients With Inclusion Body Myositis (Ibm), Liam Johnson Jan 2006

The Effectiveness Of A Home-Based, Patient-Specific, Functional Exercise Program On Patients With Inclusion Body Myositis (Ibm), Liam Johnson

Theses : Honours

Previous research has shown exercise to be beneficial in the treatment of myositis-affected patients. However, the potential of functional exercises to improve muscle strength and function in the absence of disease progression markers in patient's with Inclusion Body Myositis (IBM) is not well understood. It is believed that the initial exercise dose and patient specificity is of paramount importance in the successful use of this modality in the routine management and long term treatment of such patients. The objective of this study was to investigate the effects of a home-based, patient-specific functional exercise programme, including aerobic exercise and resistance training, …

Go to article

Pollen Characteristics Of Grevillea Species Determined By In Vitro Germination, Rebecca Parsons Jan 2006

Pollen Characteristics Of Grevillea Species Determined By In Vitro Germination, Rebecca Parsons

Theses : Honours

Germination of pollen in vitro is a common technique used to assess the ability of pollen to germinate under a variety of conditions. The ability to determine the viability of a pollen grain, and optimal conditions for maximum germination and storage are important for hybridisation. A means of storing pollen, while maintaining viability, enables inter-species hybridisation between species that are spatially and temporally (flowering time) separated. The ultimate aim of hybridisation is seed set and in order to increase this in a genus renowned for a very low fruit to flower ratio, maximum pollen germination must be obtained. Therefore, by …

Go to article

The Effects Of The Herbicide Atrazine On Human Liver Cells, Erin R. Powell Jan 2006

The Effects Of The Herbicide Atrazine On Human Liver Cells, Erin R. Powell

Honors Program Theses

Atrazine is one of the most commonly used herbicides in the United States, in particular for maize crops. This herbicide is very effective against weeds. However, it has also been associated with many harmful health effects in non-target organisms such as amphibians and mammals. One of the non-target effects of atrazine may be to act as an endocrine disruptor in different cells. To study the endocrine system effects of atrazine in human cells, a human liver cell line (HepG2) was used. In this study, we determined the effects on growth of HepG2 cells after exposure to increasing concentrations of this …

Go to article

Ltr Retrotransposon Evolution In Wild Sunflowers, Kaitlin Marie Stimpson Jan 2006

Ltr Retrotransposon Evolution In Wild Sunflowers, Kaitlin Marie Stimpson

Presidential Scholars Theses (1990 – 2006)

Transposable elements are DNA sequences that are able to move from place to place in the genome, and in some cases, make copies of themselves and reinsert back into the genome. Transposable elements are divided into three classes based on their method of transposition. Class I elements transpose by an RNA intermediate, and these include L TR (long terminal repeat) and non-L TR retrotransposons. Class II elements relocate in the genome without duplication. Interestingly, class III elements entirely lack genes and rely on products of other elements for transposition. Transposable elements are no longer considered unusual or unique components of …

Go to article

Transposon Disruption Of The Complex I Nadh Oxidoreductase Gene (Snod) In Staphylococcus Aureus Is Associated With Reduced Susceptibility To The Microbicidal Activity Of Thrombin-Induced Platelet Microbicidal Protein 1, Arnold S. Bayer, Peter Mcnamara, Michael R. Yeaman, Natalie Lucindo, Tiffanny Jones, Ambrose L. Cheung Jan 2006

Transposon Disruption Of The Complex I Nadh Oxidoreductase Gene (Snod) In Staphylococcus Aureus Is Associated With Reduced Susceptibility To The Microbicidal Activity Of Thrombin-Induced Platelet Microbicidal Protein 1, Arnold S. Bayer, Peter Mcnamara, Michael R. Yeaman, Natalie Lucindo, Tiffanny Jones, Ambrose L. Cheung

Dartmouth Scholarship

The cationic molecule thrombin-induced platelet microbicidal protein 1 (tPMP-1) exerts potent activity against Staphylococcus aureus. We previously reported that a Tn551 S. aureus transposon mutant, ISP479R, and two bacteriophage back-transductants, TxA and TxB, exhibit reduced in vitro susceptibility to tPMP-1 (tPMP-1(r)) compared to the parental strain, ISP479C (V. Dhawan, M. R. Yeaman, A. L. Cheung, E. Kim, P. M. Sullam, and A. S. Bayer, Infect. Immun. 65:3293-3299, 1997). In the current study, the genetic basis for tPMP-1(r) in these mutants was identified. GenBank homology searches using sequence corresponding to chromosomal DNA flanking Tn551 mutant strains showed that the fourth gene …

Go to article

Iowa Academy Of Science 118th Annual Meeting [2006]: Advance Program, Iowa Academy Of Science Jan 2006

Iowa Academy Of Science 118th Annual Meeting [2006]: Advance Program, Iowa Academy Of Science

Iowa Academy of Science Documents

Contains information about the schedule and presentations for the 2006 annual meeting of the Iowa Academy of Science.

Go to article

Identification Of Proteins Interacting With The Poly C Binding Protein 1 In The Central Nervous System Using Yeast Two Hybrid Screening System, Joanne Eghenayahiore Odiase Jan 2006

Identification Of Proteins Interacting With The Poly C Binding Protein 1 In The Central Nervous System Using Yeast Two Hybrid Screening System, Joanne Eghenayahiore Odiase

Seton Hall University Dissertations and Theses (ETDs)

.

Go to article

Chironomid Hemoglobin Genetic Diversity As An Indicator Of The New Jersey Hackensack Meadowlands Wetland Health, Lene Marie De Coursin Jacobs Jan 2006

Chironomid Hemoglobin Genetic Diversity As An Indicator Of The New Jersey Hackensack Meadowlands Wetland Health, Lene Marie De Coursin Jacobs

Seton Hall University Dissertations and Theses (ETDs)

.

Go to article

Gp120 Up-Regulation Of The Mu Opioid Receptor In Tpa Differentiated Hl-60 Cells, Anitha Pallur Jan 2006

Gp120 Up-Regulation Of The Mu Opioid Receptor In Tpa Differentiated Hl-60 Cells, Anitha Pallur

Seton Hall University Dissertations and Theses (ETDs)

.

Go to article

Effects Of Substrate And Temperature On Growth Of Aspergillus Flavus In Peanuts From Georgia, Premila Achar, Andres Sachez Jan 2006

Effects Of Substrate And Temperature On Growth Of Aspergillus Flavus In Peanuts From Georgia, Premila Achar, Andres Sachez

Faculty Articles

We investigated the effects of different substrates (potato dextrose agar [PDA], nutrient agar [NA], and corn meal agar [CMA]) and temperatures on growth and aflatoxin production in Aspergillus flavus. Contaminated peanuts from retailers at different locations in Georgia were used throughout the experiment and 200 seeds were selected from each sample. PDA, NA, and CMA served as the substrate to express the mold from the contaminated seeds. Seeds were plated equidistantly on each of the media and incubated at 10° C, 27° C, 30° C, and 37° C, respectively. Seeds incubated on moist filter paper served as control. Neither growth …

Go to article

First Prev Next Last