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https://www.readbyqxmd.com/read/28811878/magellanic-penguin-telomeres-do-not-shorten-with-age-with-increased-reproductive-effort-investment-and-basal-corticosterone
#1
Jack A Cerchiara, Rosa Ana Risques, Donna Prunkard, Jeffrey R Smith, Olivia J Kane, P Dee Boersma
All species should invest in systems that enhance longevity; however, a fundamental adult life-history trade-off exists between the metabolic resources allocated to maintenance and those allocated to reproduction. Long-lived species will invest more in reproduction than in somatic maintenance as they age. We investigated this trade-off by analyzing correlations among telomere length, reproductive effort and output, and basal corticosterone in Magellanic penguins (Spheniscus magellanicus). Telomeres shorten with age in most species studied to date, and may affect adult survival...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28808551/evolutionary-responses-to-a-changing-climate-implications-for-reindeer-population-viability
#2
Bård-Jørgen Bårdsen
If we want to understand how climate change affects long-lived organisms, we must know how individuals allocate resources between current reproduction and survival. This trade-off is affected by expected environmental conditions, but the extent to which density independent (DI) and density dependent (DD) processes interact in shaping individual life histories is less clear. Female reindeer (or caribou: Rangifer tarandus) are a monotocous large herbivore with a circumpolar distribution. Individuals that experience unpredictable and potentially harsh winters typically adopt risk averse strategies where they allocate more resources to building own body reserves during summer and less to reproduction...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28800691/the-landscape-model-a-model-for-exploring-trade-offs-between-agricultural-production-and-the-environment
#3
Kevin Coleman, Shibu E Muhammed, Alice E Milne, Lindsay C Todman, A Gordon Dailey, Margaret J Glendining, Andrew P Whitmore
We describe a model framework that simulates spatial and temporal interactions in agricultural landscapes and that can be used to explore trade-offs between production and environment so helping to determine solutions to the problems of sustainable food production. Here we focus on models of agricultural production, water movement and nutrient flow in a landscape. We validate these models against data from two long-term experiments, (the first a continuous wheat experiment and the other a permanent grass-land experiment) and an experiment where water and nutrient flow are measured from isolated catchments...
August 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28798947/international-organization-of-standardization-iso-and-cambridge-filter-test-cft-smoking-regimen-data-comparisons-in-tobacco-product-marketing-applications
#4
Changyu Chae, Matthew J Walters, Matthew R Holman
OBJECTIVE: We investigated the differences in TNCO (tar, nicotine, and carbon monoxide) smoke yields generated under the International Organization of Standardization (ISO) and Federal Trade Commission (FTC) Cambridge Filter Test (CFT) smoking regimens. METHODS: Twenty-nine commercial cigarette products from the US marketplace were acquired in 2015 and tested by measuring the TNCO smoke yields generated under these 2 nonintense smoking regimens. RESULTS: Data obtained demonstrated a linear relationship between the TNCO yields produced under the 2 smoking regimens (R(2) > 0...
July 2017: Tobacco Regulatory Science
https://www.readbyqxmd.com/read/28783017/barriers-to-the-development-of-forest-carbon-offsetting-insights-from-british-columbia-canada
#5
Guillaume Peterson St-Laurent, Shannon Hagerman, George Hoberg
In recent years, the provision of economic incentives through carbon financing and carbon offsetting has been central to efforts at forest carbon mitigation. However, notwithstanding their potentially important roles in climate policy, forest carbon offsets face numerous barriers which have limited widespread implementation worldwide. This paper uses the case study of the Canadian province of British Columbia to explore the barriers associated with achieving widespread implementation of forest carbon offsets in the next several decades...
August 3, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28771863/sex-specific-compensatory-growth-in-the-larvae-of-the-greater-wax-moth-galleria-mellonella
#6
Sanita Kecko, Anna Mihailova, Katariina Kangassalo, Didzis Elferts, Tatjana Krama, Ronalds Krams, Severi Luoto, Markus J Rantala, Indrikis A Krams
Deficiency of food resources in ontogeny is known to prolong an organism's developmental time and affect body size in adulthood. Yet life history traits are plastic: an organism can increase its growth rate to compensate for a period of slow growth, a phenomenon known as 'compensatory growth'. We tested whether larvae of the greater wax moth Galleria mellonella can accelerate their growth after a fast of 12, 24 or 72 h. We found that a subgroup of female larvae showed compensatory growth when starved for 12 h...
August 3, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28770063/seasonal-variation-in-basal-and-plastic-cold-tolerance-adaptation-is-influenced-by-both-long-and-short-term-phenotypic-plasticity
#7
Suegene Noh, Elizabeth R Everman, Christopher M Berger, Theodore J Morgan
Understanding how thermal selection affects phenotypic distributions across different time scales will allow us to predict the effect of climate change on the fitness of ectotherms. We tested how seasonal temperature variation affects basal levels of cold tolerance and two types of phenotypic plasticity in Drosophila melanogaster. Developmental acclimation occurs as developmental stages of an organism are exposed to seasonal changes in temperature and its effect is irreversible, while reversible short-term acclimation occurs daily in response to diurnal changes in temperature...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28768894/phenotypic-plasticity-in-reproductive-effort-malaria-parasites-respond-to-resource-availability
#8
Philip L G Birget, Charlotte Repton, Aidan J O'Donnell, Petra Schneider, Sarah E Reece
The trade-off between survival and reproduction is fundamental in the life history of all sexually reproducing organisms. This includes malaria parasites, which rely on asexually replicating stages for within-host survival and on sexually reproducing stages (gametocytes) for between-host transmission. The proportion of asexual stages that form gametocytes (reproductive effort) varies during infections-i.e. is phenotypically plastic-in response to changes in a number of within-host factors, including anaemia...
August 16, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28758218/trade-associations-and-labor-organizations-as-intermediaries-for-disseminating-workplace-safety-and-health-information
#9
Andrea H Okun, Janice P Watkins, Paul A Schulte
BACKGROUND: There has not been a systematic study of the nature and extent to which business and professional trade associations and labor organizations obtain and communicate workplace safety and health information to their members. These organizations can serve as important intermediaries and play a central role in transferring this information to their members. METHODS: A sample of 2294 business and professional trade associations and labor organizations in eight industrial sectors identified by the National Occupational Research Agenda was surveyed via telephone...
July 31, 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28757310/recommendations-for-harmonization-of-data-collection-and-analysis-of-developmental-neurotoxicity-endpoints-in-regulatory-guideline-studies-proceedings-of-workshops-presented-at-society-of-toxicology-and-joint-teratology-society-and-neurobehavioral-teratology
#10
REVIEW
Abby A Li, Larry P Sheets, Kathleen Raffaele, Virginia Moser, Angela Hofstra, Alan Hoberman, Susan L Makris, Robert Garman, Brad Bolon, Wolfgang Kaufmann, Roland Auer, Edmund Lau, Thomas Vidmar, Wayne J Bowers
The potential for developmental neurotoxicity (DNT) of environmental chemicals may be evaluated using specific test guidelines from the US Environmental Protection Agency or the Organisation for Economic Cooperation and Development (OECD). These guidelines generate neurobehavioral, neuropathological, and morphometric data that are evaluated by regulatory agencies globally. Data from these DNT guideline studies, or the more recent OECD extended one-generation reproductive toxicity guideline, play a pivotal role in children's health risk assessment in different world areas...
July 27, 2017: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/28755458/tonic-noradrenergic-activity-modulates-explorative-behavior-and-attentional-set-shifting-evidence-from-pupillometry-and-gaze-pattern-analysis
#11
Péter Pajkossy, Ágnes Szőllősi, Gyula Demeter, Mihály Racsmány
A constant task for every living organism is to decide whether to exploit rewards associated with current behavior or to explore the environment for more rewarding options. Current empirical evidence indicates that exploitation is related to phasic whereas exploration is related to tonic firing mode of noradrenergic neurons in the locus coeruleus. In humans, this exploration-exploitation trade-off is subserved by the ability to flexibly switch attention between task-related and task-irrelevant information. Here, we investigated whether this function, called attentional set shifting, is related to exploration and tonic noradrenergic discharge...
July 29, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28749697/tld-measurements-and-monte-carlo-calculations-of-head-and-neck-organ-and-effective-doses-for-cone-beam-computed-tomography-using-3d-accuitomo-170
#12
Marina Ernst, Peter Manser, Karl Dula, Werner Volken, Marco Stampanoni, Michael Fix
OBJECTIVES: In dentistry the use of Cone Beam Computed Tomography (CBCT) has steadily increased over the last few years. The aim of this study was to measure organ doses and to perform dose calculations based on Monte Carlo (MC) simulations to work out a basis for full 3D dose calculations for any patient examination performed with the machine used in this study. METHODS: TLD-100 LiF detectors were placed at 71 measurement positions on the surface and within a RT-Humanoid phantom to cover all relevant radiosensitive organs and tissues...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28742733/intravoxel-incoherent-motion-model-free-determination-of-tissue-type-in-abdominal-organs-using-machine-learning
#13
Alexander Ciritsis, Cristina Rossi, Moritz C Wurnig, Valerie Phi Van, Andreas Boss
PURPOSE: For diffusion data sets including low and high b-values, the intravoxel incoherent motion model is commonly applied to characterize tissue. The aim of the present study was to show that machine learning allows a model-free approach to determine tissue type without a priori assumptions on the underlying physiology. MATERIALS AND METHODS: In 8 healthy volunteers, diffusion data sets were acquired using an echo-planar imaging sequence with 16 b-values in the range between 0 and 1000 s/mm...
July 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28731794/a-neutral-model-for-the-evolution-of-diet-breadth
#14
Matthew L Forister, Stephen H Jenkins
Variation in diet breadth among organisms is a pervasive feature of the natural world that has resisted general explanation. In particular, trade-offs in the ability to use one resource at the expense of another have been expected but rarely detected. We explore a spatial model for the evolution of specialization, motivated by studies of plant-feeding insects. The model is neutral with respect to the causes and consequences of diet breadth: the number of hosts utilized is not constrained by trade-offs, and specialization or generalization does not confer a direct advantage with respect to the persistence of populations or the probability of diversification...
August 2017: American Naturalist
https://www.readbyqxmd.com/read/28729344/exogenous-stress-hormones-alter-energetic-and-nutrient-costs-of-development-and-metamorphosis
#15
Lucas J Kirschman, Marshall D McCue, Justin G Boyles, Robin W Warne
Variation in environmental conditions during larval life stages can shape development during critical windows and have lasting effects on the adult organism. Changes in larval developmental rates in response to environmental conditions, for example, can trade-off with growth to determine body size and condition at metamorphosis, which can affect adult survival and fecundity. However, it is unclear how use of energy and nutrients shape trade-offs across life stage transitions because no studies have quantified these costs of larval development and metamorphosis...
July 20, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28726340/factors-influencing-property-selection-for-conservation-revolving-funds
#16
Mathew J Hardy, James A Fitzsimons, Sarah A Bekessy, Ascelin Gordon
Finding sustainable ways to increase the amount of private land protected for biodiversity is a challenge for many conservation organizations. In a number of countries, organizations use 'revolving fund' programs, whereby land is purchased, and then on-sold to conservation-minded owners with a condition to enter into a conservation covenant or easement. The proceeds from sale are then used to purchase, protect and on-sell additional properties, incrementally increasing the amount of protected private land. As the effectiveness of this approach relies upon selecting the right properties, we sought to explore the factors currently considered by practitioners and how these are integrated into decision-making...
July 20, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28720699/cellular-trade-offs-and-optimal-resource-allocation-during-cyanobacterial-diurnal-growth
#17
Alexandra-M Reimers, Henning Knoop, Alexander Bockmayr, Ralf Steuer
Cyanobacteria are an integral part of Earth's biogeochemical cycles and a promising resource for the synthesis of renewable bioproducts from atmospheric CO2 Growth and metabolism of cyanobacteria are inherently tied to the diurnal rhythm of light availability. As yet, however, insight into the stoichiometric and energetic constraints of cyanobacterial diurnal growth is limited. Here, we develop a computational framework to investigate the optimal allocation of cellular resources during diurnal phototrophic growth using a genome-scale metabolic reconstruction of the cyanobacterium Synechococcus elongatus PCC 7942...
July 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28717715/compulsory-licenses-for-cancer-drugs-does-circumventing-patent-rights-improve-access-to-oncology-medications
#18
REVIEW
Cinthia Leite Frizzera Borges Bognar, Brittany L Bychkovsky, Gilberto de Lima Lopes
Worldwide, there are enormous inequities in cancer control that cause poor outcomes among patients with cancer who live in low- and middle-income countries (LMICs). One of the biggest challenges that oncology faces today is how to increase patient access to expensive, but life-saving, therapies in LMICs. Access to cancer medications in LMICs is a major problem, especially in recent years, as the costs of these therapies continue to rise exponentially. One mechanism available to LMICs to improve access to cancer medications allows a country to pursue a compulsory license for a given drug...
October 2016: Journal of Global Oncology
https://www.readbyqxmd.com/read/28712565/circadian-clock-involvement-in-zooplankton-diel-vertical-migration
#19
N Sören Häfker, Bettina Meyer, Kim S Last, David W Pond, Lukas Hüppe, Mathias Teschke
Biological clocks are a ubiquitous ancient and adaptive mechanism enabling organisms to anticipate environmental cycles and to regulate behavioral and physiological processes accordingly [1]. Although terrestrial circadian clocks are well understood, knowledge of clocks in marine organisms is still very limited [2-5]. This is particularly true for abundant species displaying large-scale rhythms like diel vertical migration (DVM) that contribute significantly to shaping their respective ecosystems [6]. Here we describe exogenous cycles and endogenous rhythms associated with DVM of the ecologically important and highly abundant planktic copepod Calanus finmarchicus...
July 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28709942/generation-time-and-fitness-tradeoffs-during-the-evolution-of-multicellularity
#20
Martin P Leslie, Deborah E Shelton, Richard E Michod
The evolution of multicellular organisms from their unicellular ancestors is an example of an evolutionary transition in individuality (ETI), i.e. a change in the units of selection and adaptation. The theory of ETIs poses particular challenges because, by definition, key theoretical constructs such as fitness are shifting during an ETI. Past work emphasized the importance of life history tradeoffs during ETIs in which lower level units form groups and become individuals at a higher level. In particular, it has been hypothesized that the convexity of the lower-level tradeoff between viability and fecundity changes with group size and determines the optimality of lower-level specialization in the fitness components of the group...
July 12, 2017: Journal of Theoretical Biology
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