Digital Commons Network^™

Gait Transition Dynamics Are Modulated By Experimental Protocol, Mohammad Abdolvahab, Jason Gordon

Mohammad Abdolvahab

No abstract provided.

Annual Variation In Autumn Migration Phenology And Energetic Condition At A Stopover Site In The Western United States, Robert A. Miller, Jay D. Carlisle, Neil Paprocki, Gregory S. Kaltenecker, Julie A. Heath

Robert Miller

Climate change is having a dramatic effect on many migratory species. Changes in climate may lead to changes in food availability or other proximate cues that affect migratory behavior. We used 13 years (2000–2012) of data on songbird banding and raptor migration counts and captures during autumn migration in the intermountain West to evaluate whether regional temperature or precipitation or hemispheric climate indices predicted autumn migratory timing and energetic condition. We examined overall trends and evaluated the effects of diet and migratory distance on phenology and conditional responses. For the 13-year study period, no temperature, precipitation, or climate index trends …

A Review Of Urban Ecosystem Services: Six Key Challenges For Future Research, C Luederitz, E Brink, F Gralla, V Hermelingmeier, M Meyer, L Niven, L Panzer, S Partelow, A-L Rau, R Sasaki, D Abson, D Lang, Christine Wamsler, H Von Wehrden

Christine Wamsler

Abstract Global urbanization creates opportunities and challenges for human well-being and transition towards sustainability. Urban areas are human-environment systems that depend fundamentally on ecosystems, and thus require an understanding of the management of urban ecosystem services to ensure sustainable urban planning. The purpose of this study is to provide a systematic review of urban ecosystems services research, which addresses the combined domain of ecosystem services and urban development. We examined emerging trends and gaps in how urban ecosystem services are conceptualized inp eer-re viewed case study literature, including the geographical distribution of research, the development and use of the urban …

Green Cities, The Search For Sustainability, And Urban Environmental History, Christopher Wells

Christopher W. Wells

No abstract provided.

Danwei System In China And Its Impact On The Daily Life Of Urban Residents After Reform, Luo Li

Luo Li

Danwei system is a very unique phenomenon in China’s urban areas.There is no doubt that set up after the establishment of new China, danwei exerted its social function strongly. It is not only being the tool for national integration, but easing the pressure of unemployment and providing social welfare as well. However, there were few researches on Chinese danwei system. People lived and worked in danwei and took the system as granted. With the penetration of reform, the traditional structure of danwei has been profoundly changed, so do the political and social functions,Meanwhile, increasing number of scholars began to realize …

Copyright And Inequality, Lea Shaver

Lea Shaver

The prevailing theory of copyright law imagines a marketplace efficiently serving up new works to an undifferentiated world of consumers. Yet the reality is that all consumers are not equal. The majority of the world’s people experience copyright law not as a boon to consumer choice, but as a barrier to acquiring knowledge and taking part in cultural life. The resulting patterns of privilege and disadvantage, moreover, reinforce and perpetuate preexisting social divides. Class and culture combine to explain who wins, and who loses, from copyright protection. Along the dimension of class, the insight is that just because new works …

Long-Term Ecological Study Of The Ogeechee River Flood Plain, S. Jeffrey Underwood, John T. Van Stan Ii, James S. Reichard, Jacque Kelly, Wei Tu, Douglas P. Aubrey

John T. Van Stan II

No abstract provided.

Changing Climate And The Altitudinal Range Of Avian Malaria In The Hawaiian Islands – An Ongoing Conservation Crisis On The Island Of Kaua`I, Carter T. Atkonson, Ruth B. Utzurrum, Dennis A. Lapointe, Richard J. Camp, Lisa H. Crampton, Jeffrey T. Foster, Thomas W. Giambelluca

Richard J. Camp

Transmission of avian malaria in the Hawaiian Islands varies across altitudinal gradients and is greatest at elevations below 1500 m where both temperature and moisture are favorable for the sole mosquito vector, Culex quinquefasciatus, and extrinsic sporogonic development of the parasite, Plasmodium relictum. Potential consequences of global warming on this system have been recognized for over a decade with concerns that increases in mean temperatures could lead to expansion of malaria into habitats where cool temperatures currently limit transmission to highly susceptible endemic forest birds. Recent declines in two endangered species on the island of Kaua’i, the ‘Akikiki (Oreomystis bairdi) …

The Cumulative Effects Of Management On The Population Dynamics Of The Double-Crested Cormorant Phalacrocorax Auritus In The Great Lakes, Alban Guillaumet, Brian S. Dorr, Guiming Wang, Terry J. Doyle

Brian S Dorr

Wildlife species have been subject to control efforts throughout human history due to real or alleged human–wildlife conflicts. The Double-crested Cormorant Phalacrocorax auritus in the interior of North America is no exception, with recent population growth leading to increased conflicts and consequently the development of many control programmes. These control programmes are usually conducted at local scales, often with little or no effort to assess their cumulative effects at the population level. We attempted the first comprehensive assessment of the cumulative effects of control at various spatio-temporal scales, focusing on 199 colonies of Double-crested Cormorant monitored during a 29-year period. …

Arbuscular Mycorrhizal Symbiosis And Ecosystem Processes: Prospects For Future Research In Tropical Soils, Geofrey Soka, Mark Ritchie

Geofrey Soka

No abstract provided.

Geoecology, Nishanta Rajakaruna, S. Boyd

Nishanta Rajakaruna

No abstract provided.

Environmental, Human, And Socioeconomic Characteristics Of Pedestrian Injury And Death In Las Vegas, Nv, Courtney Coughenour, Jennifer Pharr, Tim Bungum

Courtney Coughenour

No abstract provided.

Activities Of Methionine-Γ-Lyase In The Acidophilic Archaeon “Ferroplasma Acidarmanus” Strain Fer1, M. A. Khan, Madeline M. Lopez-Munoz, Charles W. Kaspar, Kai F. Hung

Kai F. Hung

Biogeochemical processes on exposed pyrite ores result in extremely high levels of sulfuric acid at these locations. Acidophiles that thrive in these conditions must overcome significant challenges, including an environment with proton concentrations at pH 3 or below. The role of sulfur metabolism in the archaeon “Ferroplasma acidarmanus” strain fer1’s ability to thrive in this environment was investigated due to its growth-dependent production of methanethiol, a volatile organic sulfur compound. Two putative sequences for methionine- γ-lyase (EC 4.4.1.11), an enzyme known to carry out α,γ-elimination on L-methionine to produce methanethiol, were identified in fer1. Bioinformatic analyses identified a conserved pyridoxal-5′-phosphate …

Real And Perceived Damage By Wild Turkeys: A Literature Review, Scott R. Groepper, Scott E. Hygnstrom Dr, Brandon Houck, Stephen M. Vantassel

Scott R Groepper

As populations of wild turkeys (Meleagris gallopavo) have increased, the number of complaints about damage has increased. We conducted a literature review to determine real and perceived damage caused by wild turkeys in North America. Wild turkeys can cause damage to agricultural crops, such as corn (Zea mays L.), soybeans (Glycine max [L.] Merrill), wheat, and hay crops but the majority of actual damage is usually minor or caused by other wildlife, thus estimates of damage by wild turkeys often are inflated. Occasionally, wild turkeys damage specialty crops, turfgrass, or ornamental flowers that may have higher value than common agricultural …

The Role Of Alcohol In Forging And Maintaining Friendships Amongst Scottish Men In Mid-Life, Carol Emslie, Kate Hunt, Antonia Lyons

Dr Carol Emslie

Objective: Men drink more heavily and are more likely to die from alcohol-related causes than women. Most alcohol research focuses on young drinkers. We describe the context of men’s drinking in mid-life and explore how alcohol is associated with the construction of masculinities.

Methods: Qualitative research was used to examine the social context of drinking alcohol. We conducted 15 focus groups (single and mixed sex) with respondents in the west of Scotland, UK. Here, we focus on the findings from 22 men aged 28 to 52 years.

Results: Men regarded drinking pints of beer in the pub together as an …

Divergence In Thyroid Hormone Concentrations Between Juveniles Of Marine And Stream Ecotypes Of The Threespine Stickleback (Gasterosteus Aculeatus), Jun Kitano, Sean C. Lema

Sean Lema

Background: Hormones regulate the expression of multiple phenotypic traits. Therefore,

divergence in hormone concentrations may lead to evolutionary changes in the coordinated

physiological and behavioural traits that comprise an organism’s integrated phenotype. Adults

of marine ecotypes of threespine stickleback (Gasterosteus aculeatus) have higher concentrations

of the thyroid hormone thyroxine (T4) than adults of stream-resident ecotypes (Kitano

et al., 2010). Thyroid hormones are well-established mediators of osmoregulation and migratory

behaviours in fish, and the difference in T4 concentrations indicates that changes in thyroid

hormone signalling may underlie the evolutionary and ecological divergence of migratory and

non-migratory ecotypes.

Questions: Is the variation …

Hormones And Phenotypic Plasticity: Implications For The Evolution Of Integrated Adaptive Phenotypes, Sean C. Lema, Jun Kitano

Sean Lema

It is generally accepted that taxa exhibit genetic variation in phenotypic plasticity, but many questions remain unanswered about how divergent plastic responses evolve under dissimilar ecological conditions. Hormones are signaling molecules that act as proximate mediators of phenotype expression by regulating a variety of cellular, physiological, and behavioral responses. Hormones not only change cellular and physiological states but also influence gene expression directly or indirectly, thereby linking environmental conditions to phenotypic development. Studying how hormonal pathways respond to environmental variation and how those responses differ between individuals, populations, and species can expand our understanding of the evolution of phenotypic plasticity. …

Effects Of Flow Restoration On Mussel Growth In A Wild And Scenic North American River, Brandon J. Sansom, Daniel J. Hornbach, Mark C. Hove, Jason S. Kilgore

Daniel J. Hornbach

No abstract provided.

Insights Into Forest Soil Carbon Dynamics From Nuclear Magnetic Resonance Spectroscopy, Chris E. Johnson

Chris E Johnson

No abstract provided.

An Accessible Method For Implementing Hierarchal Models With Spatio-Temporal Abundance Data, Beth E. Ross, Mevin B. Hooten, David N. Koons

David N. Koons

A common goal in ecology and wildlife management is to determine the causes of variation in population dynamics over long periods of time and across large spatial scales. Many assumptions must nevertheless be overcome to make appropriate inference about spatio-temporal variation in population dynamics, such as autocorrelation among data points, excess zeros, and observation error in count data. To address these issues, many scientists and statisticians have recommended the use of Bayesian hierarchical models. Unfortunately, hierarchical statistical models remain somewhat difficult to use because of the necessary quantitative background needed to implement them, or because of the computational demands of …

Using Marine Snails To Teach Biogeography And Macroevolution: The Role Of Larvae And Dispersal Ability In The Evolution And Persistence Of Species, Jonathan R. Hendricks

Jonathan R. Hendricks

While some marine animals are capable of traveling great distances, many have limited mobility as adults and spend the majority of their lifetimes in a small geographical area or may even be cemented to a single place. While it might be expected that species with limited mobility would have small geographic distributions, some nevertheless occur over very large areas. This is the case for some marine snails (gastropods). A key factor that impacts the geographic distribution of marine snails is the type of larvae they have during the phase of their life history that follows hatching from an egg. Because …

Does Place Of Residence Affect Risk Of Suicide? A Spatial Epidemiologic Investigation In Kentucky From 1999 To 2008, Daniel M. Saman, Sabrina Walsh, Anna Borowko, Agricola Odoi

Agricola Odoi

Background: Approximately 32,000 people take their own lives every year in the United States. In Kentucky, suicide mortality rates have been steadily increasing since 1999. Few studies in the United States have assessed spatial clustering of suicides. The purpose of this study was to identify high-risk clusters of suicide at the county level in Kentucky and assess the characteristics of those suicide cases within the clusters. Methods: A spatial epidemiological study was undertaken using suicide data for the period January 1, 1999 to December 31, 2008, obtained from the Kentucky Office of Vital Statistics. Descriptive analyses using Pearson's chi-square test …

Pseudomonas Fluorescens Hk44: Lessons Learned From A Model Whole-Cell Bioreporter With A Broad Application History, Josef Trögl, Archana Chauhan, Steven Ripp, Alice C. Layton, Gabriela Kuncová, Gary S. Sayler

Gary S. Sayler

Initially described in 1990, Pseudomonas fluorescens HK44 served as the first whole-cell bioreporter genetically endowed with a bioluminescent (luxCDABE) phenotype directly linked to a catabolic (naphthalene degradative) pathway. HK44 was the first genetically engineered microorganism to be released in the field to monitor bioremediation potential. Subsequent to that release, strain HK44 had been introduced into other solids (soils, sands), liquid (water, wastewater), and volatile environments. In these matrices, it has functioned as one of the best characterized chemically-responsive environmental bioreporters and as a model organism for understanding bacterial colonization and transport, cell immobilization strategies, and the kinetics of cellular bioluminescent …

A Spatial Cluster Analysis Of Tractor Overturns In Kentucky From 1960 To 2002, Daniel M. Saman, Henry P. Cole, Agricola Odoi, Melvin L. Myers, Daniel I. Carey, Susan C. Westneat

Agricola Odoi

Background: Agricultural tractor overturns without rollover protective structures are the leading cause of farm fatalities in the United States. To our knowledge, no studies have incorporated the spatial scan statistic in identifying high-risk areas for tractor overturns. The aim of this study was to determine whether tractor overturns cluster in certain parts of Kentucky and identify factors associated with tractor overturns. Methods: A spatial statistical analysis using Kulldorff’s spatial scan statistic was performed to identify county clusters at greatest risk for tractor overturns. A regression analysis was then performed to identify factors associated with tractor overturns. Results: The spatial analysis …

Health Effects Of Trihalomethanes As Chlorinated Disinfection By Products: A Review Article, Mohammad Reza Mohammad Shafiee, Lobat Taghavi

Mohammad Reza Mohammad Shafiee

Trihalomethanes (THMs) were among the first disinfection byproducts to be discovered in chlorinated water. The substances form during a reaction between chlorine and organic matter in the water. Trihalomethanes are suspected to have negative effects on birth such as, low birth weight, intrauterine growth retardation in term births, as well as gestational age and preterm delivery. There are also some evidences showing these by-products to be mutagenic and carcinogenic, the greatest amount of evidence being related to the bladder cancer. However, there exist inconsistencies regarding such effects of THMs as different studies have provided different results in this regard. The …

Death By A Thousand Curb-Cuts: Evidence On The Effect Of Minimum Parking Requirements On The Choice To Drive, Rachel R. Weinberger

Rachel R Weinberger

Little research has been done to understand the effect of guaranteed parking at home –in a driveway or garage—on mode choice. The research presented here systematically examines neighborhoods in the three New York City boroughs for which residential, off-street parking is possible but potentially scarce. The research is conducted in two stages. Stage one is based on a Google Earth© survey of over 2,000 properties. When paired with the City’s tax lot database, that survey served as the basis to estimate on-site parking for New York City neighborhoods. With parking availability estimated, a generalized linear model based on census tracts …

A Reappraisal In São Paulo, Brazil (2008) Of "The Ecology Of Medical Care:" The "One Per Thousand's Rule"., Adriana Roncoletta, Gustavo D. Gusso, Isabela M. Bensenor, Paulo A. Lotufo

Paulo A Lotufo

This paper reassessed in Brazil, the concept of "Medical ecology" i introduced in 1961 to describe the relationship and utilization of health care services by a given population. This was a cross-sectional telephone survey among a random sample of people enrolled in a private HMO. We interviewed a random sample of non-pregnant adults over age 18 using 10 questions about symptoms and health care use during the month prior to interview. The final sample consisted of 1,065 participants (mean age 68 years, 68% female). From this sample, 424 (39.8%) reported the presence of symptoms, 311 (29.2%) had a medical office …

Development Of A Rapid Dna Extraction Method And One-Step Nested Pcr For The Detection Of Naegleria Fowleri From The Environment, Arine Fadzlun Ahmad

Arine Fadzlun Ahmad

Naegleria fowleri is a small free-living amoebo-flagellate found in natural and manmade thermal aquatic habitats worldwide. The organism is pathogenic to man causing fatal primary amoebic meningoencephalitis (PAM). Infection typically results from bathing in contaminated water and is usually fatal. It is, therefore, important to identify sites containing N. fowleri in the interests of preventive public health microbiology. Culture of environmental material is the conventional method for the isolation of N. fowleri but requires several days incubation and subsequent biochemical or molecular tests to confirm identification. Here, a nested one-step PCR test, in conjunction with a direct DNA extraction from …

The Origin Of Natural Aromatic Materials, Murray Hunter

Murray Hunter

No abstract provided.

Neighborhood Disparities In Stroke And Myocardial Infarction Mortality: A Gis And Spatial Scan Statistics Approach, Agricola Odoi

Agricola Odoi

Background: Stroke and myocardial infarction (MI) are serious public health burdens in the US. These burdens vary by geographic location with the highest mortality risks reported in the southeastern US. While these disparities have been investigated at state and county levels, little is known regarding disparities in risk at lower levels of geography, such as neighborhoods. Therefore, the objective of this study was to investigate spatial patterns of stroke and MI mortality risks in the East Tennessee Appalachian Region so as to identify neighborhoods with the highest risks. Methods: Stroke and MI mortality data for the period 1999-2007, obtained free …