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https://www.readbyqxmd.com/read/28340391/optimization-of-the-marinelli-beaker-dimensions-using-genetic-algorithm
#1
Seyed Mehrdad Zamzamian, Seyed Abolfazl Hosseini, Mohammad Samadfam
A computational code, based on the genetic algorithm and MCNPX version 2.6 code was developed and used to investigate the effects of some important parameters of HPGe detector (such as Al cap thickness, dead-layer thickness and Ge hole size) on optimum dimensions of marinelli beaker. In addition, the effects of detector material on optimal beaker dimensions were also investigated. Finally, the optimized beaker dimensions at various beaker volumes (300, 500, 700, 1000 and 1500 cm(3)) were determined for some conventional Ge detectors with different crystal sizes (16 sizes)...
March 21, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28340348/the-evolutionary-pathway-to-virulence-of-an-rna-virus
#2
Adi Stern, Ming Te Yeh, Tal Zinger, Matt Smith, Caroline Wright, Guy Ling, Rasmus Nielsen, Andrew Macadam, Raul Andino
Paralytic polio once afflicted almost half a million children each year. The attenuated oral polio vaccine (OPV) has enabled world-wide vaccination efforts, which resulted in nearly complete control of the disease. However, poliovirus eradication is hampered globally by epidemics of vaccine-derived polio. Here, we describe a combined theoretical and experimental strategy that describes the molecular events leading from OPV to virulent strains. We discover that similar evolutionary events occur in most epidemics...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28332279/micromonas-vs-virus-new-experimental-insights-challenge-viral-impact
#3
Eliana Ruiz, Anne-Claire Baudoux, Nathalie Simon, Ruth-Anne Sandaa, T Frede Thingstad, António Pagarete
Viruses have recurrently been hypothesized as instrumental in driving microbial population diversity. Nonetheless, viral mediated co-existence of r/k-strategists, predicted in the Killing-the-Winner (KtW) hypothesis, remains controversial and demands empirical evidence. Therefore, we measured the life strategy parameters that characterize the relevant system Micromonas-Micromonas Virus (MicV). A large number of host and viral strains (37 and 17, respectively) were used in a total of 629 cross-infectivity tests...
March 23, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28331589/complex-variation-in-habitat-selection-strategies-among-individuals-driven-by-extrinsic-factors
#4
Edward J Raynor, Hawthorne L Beyer, John M Briggs, Anthony Joern
Understanding behavioral strategies employed by animals to maximize fitness in the face of environmental heterogeneity, variability, and uncertainty is a central aim of animal ecology. Flexibility in behavior may be key to how animals respond to climate and environmental change. Using a mechanistic modeling framework for simultaneously quantifying the effects of habitat preference and intrinsic movement on space use at the landscape scale, we investigate how movement and habitat selection vary among individuals and years in response to forage quality-quantity tradeoffs, environmental conditions, and variable annual climate...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28319179/biophysical-comparison-of-atp-driven-proton-pumping-mechanisms-suggests-a-kinetic-advantage-for-the-rotary-process-depending-on-coupling-ratio
#5
Ramu Anandakrishnan, Daniel M Zuckerman
ATP-driven proton pumps, which are critical to the operation of a cell, maintain cytosolic and organellar pH levels within a narrow functional range. These pumps employ two very different mechanisms: an elaborate rotary mechanism used by V-ATPase H+ pumps, and a simpler alternating access mechanism used by P-ATPase H+ pumps. Why are two different mechanisms used to perform the same function? Systematic analysis, without parameter fitting, of kinetic models of the rotary, alternating access and other possible mechanisms suggest that, when the ratio of protons transported per ATP hydrolyzed exceeds one, the one-at-a-time proton transport by the rotary mechanism is faster than other possible mechanisms across a wide range of driving conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28316610/integrative-approaches-for-studying-mitochondrial-and-nuclear-genome-co-evolution-in-oxidative-phosphorylation
#6
Paul Sunnucks, Hernán E Morales, Annika M Lamb, Alexandra Pavlova, Chris Greening
In animals, interactions among gene products of mitochondrial and nuclear genomes (mitonuclear interactions) are of profound fitness, evolutionary, and ecological significance. Most fundamentally, the oxidative phosphorylation (OXPHOS) complexes responsible for cellular bioenergetics are formed by the direct interactions of 13 mitochondrial-encoded and ∼80 nuclear-encoded protein subunits in most animals. It is expected that organisms will develop genomic architecture that facilitates co-adaptation of these mitonuclear interactions and enhances biochemical efficiency of OXPHOS complexes...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28316116/water-availability-drives-signatures-of-local-adaptation-in-whitebark-pine-pinus-albicaulis-englm-across-fine-spatial-scales-of-the-lake-tahoe-basin-usa
#7
Brandon M Lind, Christopher J Friedline, Jill L Wegrzyn, Patricia E Maloney, Detlev R Vogler, David B Neale, Andrew J Eckert
Patterns of local adaptation at fine spatial scales are central to understanding how evolution proceeds, and are essential to the effective management of economically and ecologically important forest tree species. Here, we employ single and multilocus analyses of genetic data (n = 116,231 SNPs) to describe signatures of fine-scale adaptation within eight whitebark pine (Pinus albicaulis Engelm.) populations across the local extent of the environmentally heterogeneous Lake Tahoe Basin, USA. We show that despite highly shared genetic variation (FST = 0...
March 17, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28314145/preparation-of-polyhedral-oligomeric-silsesquioxane-based-cross-linked-inorganic-organic-nanohybrid-as-adsorbent-for-selective-removal-of-acidic-dyes-from-aqueous-solution
#8
Jiawei Liu, Heng Yu, Qingmei Liang, Yanna Liu, Jiwei Shen, Quan Bai
A cross-linked polyhedral oligomeric silsesquioxane (POSS) nanohybrid is synthesized through Schiff base chemistry by using octa-amino POSS as building blocks and glutaraldehyde as dual functional reagent. The obtained nanohybrid is characterized by FT-IR, solid-state (29)Si NMR, SEM, TEM, TGA and N2 adsorption-desorption isotherm, and the results demonstrate the successful cross-linkage between POSS molecules, forming block-like irregular nanoparticles with a specific surface area of 42.8m(2)g(-1). As a novel solid-phase adsorbent, cross-linked POSS nanohybrid exhibits selective adsorption properties for acidic dyes, i...
July 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28303148/differentiating-wheat-genotypes-by-bayesian-hierarchical-nonlinear-mixed-modeling-of-wheat-root-density
#9
Anton P Wasson, Grace S Chiu, Alexander B Zwart, Timothy R Binns
Ensuring future food security for a growing population while climate change and urban sprawl put pressure on agricultural land will require sustainable intensification of current farming practices. For the crop breeder this means producing higher crop yields with less resources due to greater environmental stresses. While easy gains in crop yield have been made mostly "above ground," little progress has been made "below ground"; and yet it is these root system traits that can improve productivity and resistance to drought stress...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28297856/combinatorial-optimization-using-dynamical-phase-transitions-in-driven-dissipative-systems
#10
Timothée Leleu, Yoshihisa Yamamoto, Shoko Utsunomiya, Kazuyuki Aihara
The dynamics of driven-dissipative systems is shown to be well-fitted for achieving efficient combinatorial optimization. The proposed method can be applied to solve any combinatorial optimization problem that is equivalent to minimizing an Ising Hamiltonian. Moreover, the dynamics considered can be implemented using various physical systems as it is based on generic dynamics-the normal form of the supercritical pitchfork bifurcation. The computational principle of the proposed method relies on an hybrid analog-digital representation of the binary Ising spins by considering the gradient descent of a Lyapunov function that is the sum of an analog Ising Hamiltonian and archetypal single or double-well potentials...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28294698/the-relationship-between-the-golf-swing-plane-and-ball-impact-characteristics-using-trajectory-ellipse-fitting
#11
Andrew Morrison, Denise McGrath, Eric S Wallace
The trajectory of the clubhead close to ball impact during the golf swing has previously been shown to be planar. However, the relationship between the plane orientation and the orientation characteristics of the clubhead at ball impact has yet to be defined. Fifty-two male golfers (27 high skilled, 25 intermediate skilled) hit 40 drives each in an indoor biomechanics laboratory. This study successfully fitted the trajectory of the clubhead near impact to an ellipse for each swing for players of different skill levels to help better explain this relationship...
March 15, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28292480/multivariate-prediction-equations-for-hba1c-lowering-weight-change-and-hypoglycemic-events-associated-with-insulin-rescue-medication-in-type-2-diabetes-mellitus-informing-economic-modeling
#12
Michael Willis, Christian Asseburg, Andreas Nilsson, Kristina Johnsson, Bernt Kartman
BACKGROUND: Type 2 diabetes mellitus (T2DM) is chronic and progressive and the cost-effectiveness of new treatment interventions must be established over long time horizons. Given the limited durability of drugs, assumptions regarding downstream rescue medication can drive results. Especially for insulin, for which treatment effects and adverse events are known to depend on patient characteristics, this can be problematic for health economic evaluation involving modeling. OBJECTIVES: To estimate parsimonious multivariate equations of treatment effects and hypoglycemic event risks for use in parameterizing insulin rescue therapy in model-based cost-effectiveness analysis...
March 2017: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/28292260/ruminant-specific-multiple-duplication-events-of-prdm9-before-speciation
#13
Abinash Padhi, Botong Shen, Jicai Jiang, Yang Zhou, George E Liu, Li Ma
BACKGROUND: Understanding the genetic and evolutionary mechanisms of speciation genes in sexually reproducing organisms would provide important insights into mammalian reproduction and fitness. PRDM9, a widely known speciation gene, has recently gained attention for its important role in meiotic recombination and hybrid incompatibility. Despite the fact that PRDM9 is a key regulator of recombination and plays a dominant role in hybrid incompatibility, little is known about the underlying genetic and evolutionary mechanisms that generated multiple copies of PRDM9 in many metazoan lineages...
March 14, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28289729/invasive-plants-rapidly-reshape-soil-properties-in-a-grassland-ecosystem
#14
Sean M Gibbons, Ylva Lekberg, Daniel L Mummey, Naseer Sangwan, Philip W Ramsey, Jack A Gilbert
Plant invasions often reduce native plant diversity and increase net primary productivity. Invaded soils appear to differ from surrounding soils in ways that impede restoration of diverse native plant communities. We hypothesize that invader-mediated shifts in edaphic properties reproducibly alter soil microbial community structure and function. Here, we take a holistic approach, characterizing plant, prokaryotic, and fungal communities and soil physicochemical properties in field sites, invasion gradients, and experimental plots for three invasive plant species that cooccur in the Rocky Mountain West...
March 2017: MSystems
https://www.readbyqxmd.com/read/28289230/cross-cousin-marriage-among-the-yanomam%C3%A3-shows-evidence-of-parent-offspring-conflict-and-mate-competition-between-brothers
#15
Napoleon A Chagnon, Robert F Lynch, Mary K Shenk, Raymond Hames, Mark V Flinn
Marriage in many traditional societies often concerns the institutionalized exchange of reproductive partners among groups of kin. Such exchanges most often involve cross-cousins-marriage with the child of a parent's opposite-sex sibling-but it is unclear who benefits from these exchanges. Here we analyze the fitness consequences of marrying relatives among the Yanomamö from the Amazon. When individuals marry close kin, we find that (i) both husbands and wives have slightly lower fertility; (ii) offspring suffer from inbreeding depression; (iii) parents have more grandchildren; and (iv) siblings, especially brothers, benefit when their opposite-sex siblings marry relatives but not when their same-sex siblings do...
March 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28278592/exploring-associations-between-self-regulatory-mechanisms-and-neuropsychological-functioning-and-driver-behaviour-after-brain-injury
#16
Per-Ola Rike, Hans J Johansen, Pål Ulleberg, Anna Lundqvist, Anne-Kristine Schanke
The objective of this prospective one-year follow-up study was to explore the associations between self-regulatory mechanisms and neuropsychological tests as well as baseline and follow-up ratings of driver behaviour. The participants were a cohort of subjects with stroke and traumatic brain injury (TBI) who were found fit to drive after a multi-disciplinary driver assessment (baseline). Baseline measures included neuropsychological tests and ratings of self-regulatory mechanisms, i.e., executive functions (Behavior Rating Inventory of Executive Function-Adult Version; BRIEF-A) and impulsive personality traits (UPPS Impulsive Behavior Scale)...
April 11, 2016: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/28272773/comparative-rna-seq-transcriptome-analyses-reveal-distinct-metabolic-pathways-in-diabetic-nerve-and-kidney-disease
#17
Lucy M Hinder, Meeyoung Park, Amy E Rumora, Junguk Hur, Felix Eichinger, Subramaniam Pennathur, Matthias Kretzler, Frank C Brosius, Eva L Feldman
Treating insulin resistance with pioglitazone normalizes renal function and improves small nerve fibre function and architecture; however, it does not affect large myelinated nerve fibre function in mouse models of type 2 diabetes (T2DM), indicating that pioglitazone affects the body in a tissue-specific manner. To identify distinct molecular pathways regulating diabetic peripheral neuropathy (DPN) and nephropathy (DN), as well those affected by pioglitazone, we assessed DPN and DN gene transcript expression in control and diabetic mice with or without pioglitazone treatment...
March 8, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28270443/skeletal-muscle-pgc-1%C3%AE-signaling-is-sufficient-to-drive-an-endurance-exercise-phenotype-and-to-counteract-components-of-detraining-in-mice
#18
Samuel Lee, Teresa C Leone, Lisa Rogosa, John Rumsey, Julio Ayala, Paul M Coen, Robert H Fitts, Rick B Vega, Daniel P Kelly
PPARgamma coactivator-1 (PGC-1) α; ;and β serve as master transcriptional regulators of muscle mitochondrial functional capacity and are capable of enhancing muscle endurance when overexpressed in mice. We sought to determine whether muscle-specific transgenic overexpression of PGC-1β affects the detraining response following endurance training. First, we established and validated a mouse exercise training/detraining protocol. Secondly, we found that overexpression of PGC-1β in skeletal muscle of sedentary mice fully recapitulated the training response using multiple physiological and gene expression endpoints...
March 7, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28261259/b-chromosomes-a-matter-of-chromosome-drive
#19
REVIEW
Andreas Houben
B chromosomes are supernumerary chromosomes which are often preferentially inherited, deviating from usual Mendelian segregation. The balance between the so-called chromosome drive and the negative effects that the presence of Bs applies on the fitness of their host determines the frequency of Bs in a particular population. Drive is the key for understanding most B chromosomes. Drive occurs in many ways at pre-meiotic, meiotic or post-meiotic divisions, but the molecular mechanism remains unclear. The cellular mechanism of drive is reviewed based on the findings obtained for the B chromosomes of rye, maize and other species...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28260794/aberrant-th2-inflammation-drives-dysfunction-of-alveolar-macrophages-and-susceptibility-to-bacterial-pneumonia
#20
Emily K Moser, Natania S Field, Paula M Oliver
The ubiquitin ligase, Itch, is required to prevent autoinflammatory disease in mice and humans. Itch-deficient mice develop lethal pulmonary inflammation characterized by the production of Th2 cytokines (for example, interleukin-4 (IL-4)); however, the contribution of Itch to immune defense against respiratory pathogens has not been determined. We found that Itch-deficient mice were highly susceptible to intranasal infection with the respiratory pathogen Klebsiella pneumoniae. Infected Itch-deficient mice exhibited increased immune cell infiltration, cytokine levels and bacterial burden in the respiratory tract compared with control mice...
March 6, 2017: Cellular & Molecular Immunology
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