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2014

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Articles 451 - 479 of 479

Full-Text Articles in Life Sciences

Skeletal Muscle Myofilament Adaptations To Aging, Disease And Disuse And Their Effects On Whole Muscle Performance In Older Adult Humans, Mark S. Miller, Damien M. Callahan, Michael J. Toth Dec 2013

Skeletal Muscle Myofilament Adaptations To Aging, Disease And Disuse And Their Effects On Whole Muscle Performance In Older Adult Humans, Mark S. Miller, Damien M. Callahan, Michael J. Toth

Mark S. Miller

Skeletal muscle contractile function declines with aging, disease, and disuse. In vivo muscle contractile function depends on a variety of factors, but force, contractile velocity and power generating capacity ultimately derive from the summed contribution of single muscle fibers. The contractile performance of these fibers are, in turn, dependent upon the isoform and function of myofilament proteins they express, with myosin protein expression and its mechanical and kinetic characteristics playing a predominant role. Alterations in myofilament protein biology, therefore, may contribute to the development of functional limitations and disability in these conditions. Recent studies suggest that these conditions are associated …


Penalized Integrative Analysis Of High-Dimensional Omics Data, Shuangge Ma Dec 2013

Penalized Integrative Analysis Of High-Dimensional Omics Data, Shuangge Ma

Shuangge Ma

No abstract provided.


Elite Female Tae Kwon Do Athletes Have Faster Reaction Time And Longer Movement Time Than Males During A Striking Kick, Ulysses Fernandes Ervilha, Valmar Fernandes Da Silva, Rubens Correa Araújo, Luis Mochizuki, Joseph Hamill Dec 2013

Elite Female Tae Kwon Do Athletes Have Faster Reaction Time And Longer Movement Time Than Males During A Striking Kick, Ulysses Fernandes Ervilha, Valmar Fernandes Da Silva, Rubens Correa Araújo, Luis Mochizuki, Joseph Hamill

Joseph Hamill

Background & Study Aim: An important aspect of ap bal ap dolio tchagui kick in tae kwon do is that it is usually performed in reaction to a signal or event. That is, given a specific stimulus (i.e. the movement of the opponent), the tae kwon do athlete must react as quickly and accurately as possible to the stimulus. Reacting to a stimulus requires preparation and it is essential to determine this preparation of an elite athlete to perform a task. Therefore, to investigate this movement a reaction time paradigm is appropriate wherein the athlete accomplishes the kick in response …


Acute Effect Of Different Minimalist Shoes On Foot Strike Pattern And Kinematics In Rearfoot Strikers During Running, Roberto Squadrone, Renato Rodano, Joseph Hamill, Ezio Preatoni Dec 2013

Acute Effect Of Different Minimalist Shoes On Foot Strike Pattern And Kinematics In Rearfoot Strikers During Running, Roberto Squadrone, Renato Rodano, Joseph Hamill, Ezio Preatoni

Joseph Hamill

Despite the growing interest in minimalist shoes, no studies have compared the efficacy of different types of minimalist shoe models in reproducing barefoot running patterns and in eliciting biomechanical changes that make them differ from standard cushioned running shoes. The aim of this study was to investigate the acute effects of different footwear models, marketed as “minimalist” by their manufacturer, on running biomechanics. Six running shoes marketed as barefoot/minimalist models, a standard cushioned shoe and the barefoot condition were tested. Foot–/shoe–ground pressure and three-dimensional lower limb kinematics were measured in experienced rearfoot strike runners while they were running at 3.33 …


Insights Into The Evolution And Diversification Of The At-Hook Motif Nuclear Localized Gene Family In Land Plants, Jianfei Zhao, David Favero, Jiwen Qiu, Eric Roalson, Michael Neff Dec 2013

Insights Into The Evolution And Diversification Of The At-Hook Motif Nuclear Localized Gene Family In Land Plants, Jianfei Zhao, David Favero, Jiwen Qiu, Eric Roalson, Michael Neff

Jianfei Zhao

Background:
Members of the ancient land-plant-specific transcription factor AT-Hook Motif Nuclear Localized (AHL)
gene family regulate various biological processes. However, the relationships among the AHL genes, as well as their evolutionary history, still remain unexplored.

Results:
We analyzed over 500 AHL genes from 19 land plant species, ranging from the early diverging Physcomitrella
patens and Selaginella to a variety of monocot and dicot flowering plants. We classified the AHL proteins into three types (Type-I/-II/-III) based on the number and composition of their functional domains, the AT-hook motif(s) and PPC domain. We further inferred their phylogenies via Bayesian inference analysis and …


Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona Dec 2013

Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona

Victor D. Carmona-Galindo

Castor bean (Ricinus communis L.) is a myrmecophytic plant species with specialized extrafloral nectar (EFN) glands that serve to attract predatory insects, which in return defend plant-tissues against herbivores. The EFN glands on castor bean plants are located along the leaf petioles as well as on the peduncles of its imperfect (unisexual) flowers. This field-project evaluates the richness, diversity, and species assemblage of insects visiting EFN glands located on (female and male) flower peduncles and leaf petioles on castor bean plants growing in a Southern California coastal landscape. We detected that EFN glands on female-flower peduncles were visited by an …


Environmental Sustainability Criteria In The Coffee Sector – Lessons That Can Be Learnt, Evgenia Pavlovskaia Dec 2013

Environmental Sustainability Criteria In The Coffee Sector – Lessons That Can Be Learnt, Evgenia Pavlovskaia

Evgenia Pavlovskaia

In the article, the issue of environmental sustainability criteria in the coffee sector is researched. Such important aspects in this topic are highlighted and discussed as reasons for the emergence of sustainability criteria for coffee and factors that make the production of coffee sustainable. Two widely used sustainability standards for coffee, the Fair Trade Coffee sustainability standard and the Utz Certified Coffee sustainability standard, are investigated more precisely. The environmental requirements of these standards in the form of environmental sustainability criteria, and mechanisms to control their fulfilment are outlined. The issue of control is separately highlighted, because it is considered …


Grain Drying Systems, Kasiviswanathan Muthukumarappan, Poonam Singha Dec 2013

Grain Drying Systems, Kasiviswanathan Muthukumarappan, Poonam Singha

POONAM SINGHA

Grain drying begins in the field after the grain is fully mature. The primary objective of grain drying and storage is to manage the temperature and moisture of the air around the grain to minimize grain quality and market value losses while holding the grain for better market opportunities. Maintaining grain quality requires drying the grain to safe moisture content levels after harvest followed by lowering and maintaining the grain temperature within a few degrees of ambient air temperatures. Natural drying exposes the wet grains to sun and wind. Artificial dryers employ high temperature directly or indirectly in both natural …


Do Predator Cues Influence Turn Alternation Behavior In Terrestrial Isopods Porcellio Laevis Latreille And Armadillidium Vulgare Latreille?, Scott Kight Dec 2013

Do Predator Cues Influence Turn Alternation Behavior In Terrestrial Isopods Porcellio Laevis Latreille And Armadillidium Vulgare Latreille?, Scott Kight

Scott Kight

Terrestrial isopods (Crustacea: Oniscidea) make more alternating maze turns in response to negative stimuli, a navigational behavior that corrects divergence from a straight line. The present study investigates this behavioral pattern in two species, Porcellio laevis Latreille and Armadillidium vulgare Latreille, in response to short-term vs. long-term exposure to indirect cues from predatory ants. Neither isopod species increased the number of alternating turns in response to short-term indirect exposure to ants, but both species made significantly more alternating turns following continuous indirect exposure to ants for a period of one-week. These results are surprising given differences in behavioral and …


Expanding The Direct Hetr Regulon In Anabaena Sp. Strain Pcc 7120, Loralyn Cozy, Patrick Videau, Shuisong Ni, Orion S. Rivers, Blake Ushijima, Michael A. Kennedy, Erik A. Feldmann, Sean M. Callahan Dec 2013

Expanding The Direct Hetr Regulon In Anabaena Sp. Strain Pcc 7120, Loralyn Cozy, Patrick Videau, Shuisong Ni, Orion S. Rivers, Blake Ushijima, Michael A. Kennedy, Erik A. Feldmann, Sean M. Callahan

Loralyn Cozy

In response to a lack of environmental combined nitrogen, the filamentous cyanobacterium Anabaena sp. strain PCC 7120 differentiates nitrogen-fixing heterocyst cells in a periodic pattern. HetR is a transcription factor that coordinates the regulation of this developmental program. An inverted repeat-containing sequence in the hepA promoter required for proheterocyst-specific transcription was identified based on sequence similarity to a previously characterized binding site for HetR in the promoter of hetP. The binding affinity of HetR for the hepA site is roughly an order of magnitude lower than that for the hetP binding site. A BLAST search of the Anabaena genome …


Biodynamic Imaging And High-Content Analysis, Ran An, David D. Nolte Dec 2013

Biodynamic Imaging And High-Content Analysis, Ran An, David D. Nolte

David D Nolte

The existence of phenotypic differences in the drug responses of 3D tissue relative to 2D cell culture is a concern in high-content drug screening. Biodynamic imaging is an emerging technology that probes 3D tissue using short-coherence dynamic light scattering to measure the intracellular motions inside tissues in their natural microenvironments. The information content of biodynamic imaging is displayed through tissue dynamics spectroscopy (TDS) but has not previously been correlated against morphological image analysis of 2D cell culture. In this article, a set of mitochondria-affecting compounds (FCCP, valinomycin, nicardipine, ionomycin) and Raf kinase inhibitors (PLX4032, PLX4720, GDC, and sorafenib) are applied …


Microzooplankton Distribution, Dynamics, And Trophic Interactions Relative To Phytoplankton And Quagga Mussels In Saginaw Bay, Lake Huron, Peter J. Lavrentyev, Henry A. Vanderploeg, Gayantonia Franze, Dinorah H. Chacin, James R. Liebig, Thomas H. Johengen Dec 2013

Microzooplankton Distribution, Dynamics, And Trophic Interactions Relative To Phytoplankton And Quagga Mussels In Saginaw Bay, Lake Huron, Peter J. Lavrentyev, Henry A. Vanderploeg, Gayantonia Franze, Dinorah H. Chacin, James R. Liebig, Thomas H. Johengen

Peter J. Lavrentyev

Invasive quagga mussels have recently replaced zebra mussels as the dominant filter-feeding bivalves in the
Great Lakes. This study examined microzooplankton (i.e., grazers <200 μm) and their trophic interactions with
phytoplankton, bacteria, and bivalve mussels in Saginaw Bay, Lake Huron, following the zebra to quagga mussel
shift.Microzooplankton distribution displayed strong spatial and temporal variability (1.73–28.5 μg C/L) relative
to phytoplankton distribution. Ciliates were the dominant component, especially in the spring and early summer.
Rotifers and dinoflagellates increased toward late summer/fall in the inner and outer parts of the bay, respectively.
Microzooplankton grazing matched bacterial growth rates and removed ca. 30% …


Synthesis Of Alpo-5 With Diol-Substituted Imidazolium-Based Organic Template, Eng-Poh Ng Dr. Dec 2013

Synthesis Of Alpo-5 With Diol-Substituted Imidazolium-Based Organic Template, Eng-Poh Ng Dr.

Eng-Poh Ng

No abstract provided.


The Synthesis And Characterization Of High Purity Mixed Microporous/Mesoporous Activated Carbon From Rice Husk Using Chemical Activation With Naoh And Koh, Eng-Poh Ng Dr. Dec 2013

The Synthesis And Characterization Of High Purity Mixed Microporous/Mesoporous Activated Carbon From Rice Husk Using Chemical Activation With Naoh And Koh, Eng-Poh Ng Dr.

Eng-Poh Ng

No abstract provided.


“Grisly Man, Gods, And Monsters,”, Kirby Farrell Dec 2013

“Grisly Man, Gods, And Monsters,”, Kirby Farrell

kirby farrell

“Grisly Man, Gods, and Monsters” by Kirby Farrell,
Werner Herzog’s documentary Grizzly Man (2005) examines the fatal infatuation of Timothy William Dexter (Treadwell) with Alaskan grizzly bears. 

A failed actor and recovering addict, Dexter reinvented himself as
Timothy Treadwell, the “grizzly man,” using the camera and his charismatic
personality to promote a vision of the lone hero taming a savage but
mysteriously – even religiously - “perfect” nature. In 2004 a grizzly mauled
and ate the increasingly reckless Treadwell and his girlfriend Amie Hugenaard.

Treadwell’s self-exposure to the bears acted out sacrificial and suicidal
themes and can be understood in …


An Updated List Of The Amphibians And Reptiles Of Honduras, With Selected Comments On Their Nomenclature, Josiah H. Townsend Dec 2013

An Updated List Of The Amphibians And Reptiles Of Honduras, With Selected Comments On Their Nomenclature, Josiah H. Townsend

Josiah Townsend

We provide an updated list of the amphibians and reptiles of Honduras, and include notes on
nomenclatural changes. We recognize a total of 396 species (135 amphibians, 261 reptiles), of which 107
are endemic and seven are exotic.


Biomart: A Research Data Management Tool For The Biomedical Sciences, Rolando Garcia-Milian Dec 2013

Biomart: A Research Data Management Tool For The Biomedical Sciences, Rolando Garcia-Milian

Rolando Garcia-Milian

BioMart (www.biomart.org) is a freely available open source system that allows complex queries across more than 40 different biological data sets through a single web interface. Originally developed for the Ensembl genome browser, BioMart has been integrated into widely used software such as Galaxy, BioConductor, and Cytoskape. The BioMart interface is also used by data portals such as Ensembl, Wormbase, Gramene, and Reactome. In this workshop we will use simple examples to demonstrate how to navigate, build queries, and save and export the results on BioMart such as: - how to retrieve the Ensembl mouse genes and genomic locations in …


Introduction To Genome Browsers, Rolando Garcia-Milian Dec 2013

Introduction To Genome Browsers, Rolando Garcia-Milian

Rolando Garcia-Milian

In this workshop we will learn how to navigate the genome browsers from NCBI's Genome Workbench, UCSC Genome Browser, and Ensembl. These browsers are valuable tools when identifying, localizing genes, and looking at their information in the genomic context. By using concrete examples, it will be shown how to locate a human gene, download a gene sequence and its upstream sequence, locate Single Nucleotide Polymorphisms (SNPs) and conserved regions, and use the browsers to download results in a batch.


Visualization Of Temporal Change In Soundscape Power Of A Michigan Lake Habitat Over A 4-Year Period, Stuart H. Gage, Anne C. Axel Dec 2013

Visualization Of Temporal Change In Soundscape Power Of A Michigan Lake Habitat Over A 4-Year Period, Stuart H. Gage, Anne C. Axel

Anne C. Axel

Soundscape Ecology is an emerging area of science that does not focus on the identification of species in the soundscape but attempts to characterize sounds by organizing them into those produced by biological organisms such as birds, amphibians, insects or mammals; physical environmental factors such as thunder, rainfall or wind; and sounds produced by human entities such as airplanes, automobiles or air conditioners. The soundscape changes throughout the day and throughout the seasons. The soundscape components that create the sound occur at different frequencies. A set of metrics termed soundscape power was computed and visualized to examine the patterns of …


Different Meal, Same Flavor: Cospeciation And Host Switching Of Haemosporidian Parasites In Some Non-Passerine Birds, Diego Santiago-Alarcon, Adriana Rodríguez-Ferraro, Patricia G. Parker, Robert E. Ricklefs Dec 2013

Different Meal, Same Flavor: Cospeciation And Host Switching Of Haemosporidian Parasites In Some Non-Passerine Birds, Diego Santiago-Alarcon, Adriana Rodríguez-Ferraro, Patricia G. Parker, Robert E. Ricklefs

Robert Ricklefs

Background
Previous studies have shown that haemosporidian parasites (Haemoproteus(Parahaemoproteus) and Plasmodium) infecting passerine birds have an evolutionary history of host switching with little cospeciation, in particular at low taxonomic levels (e.g., below the family level), which is suggested as the main speciation mechanism of this group of parasites. Recent studies have characterized diverse clades of haemosporidian parasites (H. (Haemoproteus) and H. (Parahaemoproteus)) infecting non-passerine birds (e.g., Columbiformes, Pelecaniiformes). Here, we explore the cospeciation history of H. (Haemoproteus) and H. (Parahaemoproteus) parasites with …


Different Meal, Same Flavor: Cospeciation And Host Switching Of Haemosporidian Parasites In Some Non-Passerine Birds, Diego Santiago-Alarcon, Adriana Rodríguez-Ferraro, Patricia G. Parker, Robert E. Ricklefs Dec 2013

Different Meal, Same Flavor: Cospeciation And Host Switching Of Haemosporidian Parasites In Some Non-Passerine Birds, Diego Santiago-Alarcon, Adriana Rodríguez-Ferraro, Patricia G. Parker, Robert E. Ricklefs

Patricia Parker

Background
Previous studies have shown that haemosporidian parasites (Haemoproteus (Parahaemoproteus) and Plasmodium) infecting passerine birds have an evolutionary history of host switching with little cospeciation, in particular at low taxonomic levels (e.g., below the family level), which is suggested as the main speciation mechanism of this group of parasites. Recent studies have characterized diverse clades of haemosporidian parasites (H. (Haemoproteus) and H. (Parahaemoproteus)) infecting non-passerine birds (e.g., Columbiformes, Pelecaniiformes). Here, we explore the cospeciation history of H. (Haemoproteus) and H. (Parahaemoproteus) parasites with their non-passerine hosts.

Methods
We sequenced the mtDNA cyt b gene of both haemosporidian parasites and their …


Intrinsic Delocalization During The Decay Of Excitons In Polymeric Solar Cells, Thomas F. George, W. Chen, D. Jiang, R. Chen, S. Li Dec 2013

Intrinsic Delocalization During The Decay Of Excitons In Polymeric Solar Cells, Thomas F. George, W. Chen, D. Jiang, R. Chen, S. Li

Thomas George

In bulk heterojunction polymer solar cells, external photoexcitation results in localized excitons in the polymer chain. After hot exciton formation and subsequent relaxation, the dipole moment drives the electron to partially transfer to extended orbitals from the original localized ones, leading to self-delocalization. Based on the dynamic fluorescence spectra, the delocalization of excitons is revealed to be an intrinsic property dominated by exciton decay, acting as a bridge for the exciton to diffuse in the polymeric solar cell. The modification of the dipole moment enhances the efficiency of polymer solar cells.


Complete Genome Sequence Of Anabaena Variabilis Atcc 29413, Teresa Thiel, Brenda S. Pratte, Jinshun Zhong, Lynne Goodwin, Alex Copeland, Susan Lucas, Cliff Han, Sam Pitluck, Miriam L. Land, Nikos C. Kyrpides, Tanja Woyke Dec 2013

Complete Genome Sequence Of Anabaena Variabilis Atcc 29413, Teresa Thiel, Brenda S. Pratte, Jinshun Zhong, Lynne Goodwin, Alex Copeland, Susan Lucas, Cliff Han, Sam Pitluck, Miriam L. Land, Nikos C. Kyrpides, Tanja Woyke

Teresa Thiel

Anabaena variabilis ATCC 29413 is a filamentous, heterocyst-forming cyanobacterium that has served as a model organism, with an extensive literature extending over 40 years. The strain has three distinct nitrogenases that function under different environmental conditions and is capable of photoautotrophic growth in the light and true heterotrophic growth in the dark using fructose as both carbon and energy source. While this strain was first isolated in 1964 in Mississippi and named Anabaena flos-aquae MSU A-37, it clusters phylogenetically with cyanobacteria of the genus Nostoc. The strain is a moderate thermophile, growing well at approximately 40° C. Here we provide …


Validation Of A Previous Day Recall For Measuring The Location And Purpose Of Active And Sedentary Behaviors Compared To Direct Observation, Sarah Kozey Keadle, Kate Lyden, Amanda Hickey, Evan L. Ray, Jay H. Fowke, Patty S. Freedson, Charles E. Matthews Dec 2013

Validation Of A Previous Day Recall For Measuring The Location And Purpose Of Active And Sedentary Behaviors Compared To Direct Observation, Sarah Kozey Keadle, Kate Lyden, Amanda Hickey, Evan L. Ray, Jay H. Fowke, Patty S. Freedson, Charles E. Matthews

Patty S. Freedson

Purpose Gathering contextual information (i.e., location and purpose) about active and sedentary behaviors is an advantage of self-report tools such as previous day recalls (PDR). However, the validity of PDR’s for measuring context has not been empirically tested. The purpose of this paper was to compare PDR estimates of location and purpose to direct observation (DO). Methods Fifteen adult (18–75 y) and 15 adolescent (12–17 y) participants were directly observed during at least one segment of the day (i.e., morning, afternoon or evening). Participants completed their normal daily routine while trained observers recorded the location (i.e., home, community, work/school), purpose …


Spatial Dynamics Of Canopy Trees In An Old Growth Eastern Hemlock Forest In The Central Appalachian Highlands, Heather P. Griscom, B. Griscom, L. Siderhurst Dec 2013

Spatial Dynamics Of Canopy Trees In An Old Growth Eastern Hemlock Forest In The Central Appalachian Highlands, Heather P. Griscom, B. Griscom, L. Siderhurst

Heather P. Griscom

No abstract provided.


The Cryptococcus Neoformans Transcriptome At The Site Of Human Meningitis, Yuan Chen, Dena L. Toffaletti, Jennifer L. Tenor, Anastasia P. Litvintseva, Charles Fang, Thomas G. Mitchell, Tami R. Mcdonald, Kirsten Nielsen, David R. Boulware, Tihana Bicanic, John R. Perfect Dec 2013

The Cryptococcus Neoformans Transcriptome At The Site Of Human Meningitis, Yuan Chen, Dena L. Toffaletti, Jennifer L. Tenor, Anastasia P. Litvintseva, Charles Fang, Thomas G. Mitchell, Tami R. Mcdonald, Kirsten Nielsen, David R. Boulware, Tihana Bicanic, John R. Perfect

Tami McDonald

No abstract provided.


Can They Dig It? Functional Morphology And Degrees Of Semifossoriality Among Some American Shrews (Mammalia, Soricidae)., Neal Woodman, Sarah A. Gaffney Dec 2013

Can They Dig It? Functional Morphology And Degrees Of Semifossoriality Among Some American Shrews (Mammalia, Soricidae)., Neal Woodman, Sarah A. Gaffney

Neal Woodman

Small-eared shrews (Mammalia: Soricidae: Cryptotis), exhibit modifications of the forelimb skeleton that have been interpreted as adaptations for semifossoriality. Most species inhabit remote regions, however, and their locomotory and foraging behaviors remain mostly speculative. To better understand the morphological modifications in the absence of direct observations, we quantified variation in these species by measuring 151 individuals representing 18 species and populations of Cryptotis and two species of moles (Talpidae) for comparison. From our measurements, we calculated 22 indices, most of which have been used previously to characterize substrate use among rodents and other taxa. We analyzed the indices using 1) …


Jmu 4-Va Grant: Characterizing Epigenetic Regulation Of Gene Experession During Development Of The Vertebrate Retina, Raymond A. Enke Dec 2013

Jmu 4-Va Grant: Characterizing Epigenetic Regulation Of Gene Experession During Development Of The Vertebrate Retina, Raymond A. Enke

Ray Enke Ph.D.

4-VA Funded Research Grant: Characterizing epigenetic regulation of gene experession during development of the vertebrate retina


Infiltrometers For Restoration Site Evaluation, David A. Bainbridge Dec 2013

Infiltrometers For Restoration Site Evaluation, David A. Bainbridge

David A Bainbridge

Infiltration is a key factor in site disturbance and recovery as it determines soil moisture into the soil. Field evaluation can be done with an infiltrometer or sprinkling infiltrometer. Low cost field tested methods include: double ring, single ring and microsprinkler infiltrometers.