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https://www.readbyqxmd.com/read/28107778/parabolic-variation-in-sexual-selection-intensity-across-the-range-of-a%C3%A2-cold-water-pipefish-implications-for-susceptibility-to-climate-change
#1
Nuno Monteiro, Mário Cunha, Lídia Ferreira, Natividade Vieira, Agostinho Antunes, David Lyons, Adam G Jones
While an understanding of evolutionary processes in shifting environments is vital in the context of rapid ecological change, one of the most potent selective forces, sexual selection, remains curiously unexplored. Variation in sexual selection across a species range, especially across a gradient of temperature regimes, has the potential to provide a window into the possible impacts of climate change on the evolution of mating patterns. Here, we investigated some of the links between temperature and indicators of sexual selection, using a cold-water pipefish as model...
January 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28107684/non-invasive-brain-stimulation-targeting-the-right-fusiform-gyrus-selectively-increases-working-memory-for-faces
#2
Tad T Brunyé, Joseph M Moran, Amanda Holmes, Caroline R Mahoney, Holly A Taylor
The human extrastriate cortex contains a region critically involved in face detection and memory, the right fusiform gyrus. The present study evaluated whether transcranial direct current stimulation (tDCS) targeting this anatomical region would selectively influence memory for faces versus non-face objects (houses). Anodal tDCS targeted the right fusiform gyrus (Brodmann's Area 37), with the anode at electrode site PO10, and cathode at FP2. Two stimulation conditions were compared in a repeated-measures design: 0...
January 17, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28107495/germination-response-of-four-alien-congeneric-amaranthus-species-to-environmental-factors
#3
Jian-Hua Hao, Shuang-Shuang Lv, Saurav Bhattacharya, Jian-Guo Fu
Seed germination is the key step for successful establishment, growth and further expansion of population especially for alien plants with annual life cycle. Traits like better adaptability and germination response were thought to be associated with plant invasion. However, there are not enough empirical studies correlating adaptation to environmental factors with germination response of alien invasive plants. In this study, we conducted congeneric comparisons of germination response to different environmental factors such as light, pH, NaCl, osmotic and soil burials among four alien amaranths that differ in invasiveness and have sympatric distribution in Jiangsu Province, China...
2017: PloS One
https://www.readbyqxmd.com/read/28107400/when-contact-is-not-enough-affecting-first-year-medical-students-image-towards-older-persons
#4
Sasmita Kusumastuti, Esther van Fenema, Eugenie C F Polman-van Stratum, Wilco Achterberg, Jolanda Lindenberg, Rudi G J Westendorp
CONTEXT: Many medical schools have initiated care internships to familiarize their students with older persons and to instil a professional attitude. OBJECTIVE: To examine the impact of care internships on the image that first-year medical students have of older persons and to explore the underlying concepts that may play a role in shaping this image. DESIGN: Survey before and after a two-week compulsory care internship using the Aging Semantic Differential (ASD; 32 adjectives) and the Attitudes toward Old People (AOP; 34 positions) questionnaires...
2017: PloS One
https://www.readbyqxmd.com/read/28107383/effects-of-forced-swimming-stress-on-erk-and-histone-h3-phosphorylation-in-limbic-areas-of-roman-high-and-low-avoidance-rats
#5
Noemi Morello, Ornella Plicato, Maria Antonietta Piludu, Laura Poddighe, Maria Pina Serra, Marina Quartu, Maria Giuseppa Corda, Osvaldo Giorgi, Maurizio Giustetto
Stressful events evoke molecular adaptations of neural circuits through chromatin remodeling and regulation of gene expression. However, the identity of the molecular pathways activated by stress in experimental models of depression is not fully understood. We investigated the effect of acute forced swimming (FS) on the phosphorylation of the extracellular signal-regulated kinase (ERK)1/2 (pERK) and histone H3 (pH3) in limbic brain areas of genetic models of vulnerability (RLA, Roman low-avoidance rats) and resistance (RHA, Roman high-avoidance rats) to stress-induced depression-like behavior...
2017: PloS One
https://www.readbyqxmd.com/read/28107061/the-evolution-of-reproductive-phenology-in-broadcast-spawners-and-the-maintenance-of-sexually-antagonistic-polymorphism
#6
Colin Olito, Dustin J Marshall, Tim Connallon
Reproductive phenology is a crucial life-history trait that evolves in response to external environmental conditions and frequency- and density-dependent interactions within species. Broadcast spawners-which represent a large fraction of aquatic biodiversity-evolve phenologies that balance strong density-dependent fertilization success against abiotic environmental conditions that are required for successful reproduction. The overall balance between these processes may be particularly complex in dioecious species, where selection on reproductive timing potentially differs between the sexes...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28107058/rapid-changes-in-the-sex-linkage-of-male-coloration-in-introduced-guppy-populations
#7
Swanne P Gordon, Andrés López-Sepulcre, Diana Rumbo, David N Reznick
Theory predicts that the sex linkage of sexually selected traits can influence the direction and rate of evolution and should itself evolve in response to sex-specific selection. Some studies have found intraspecific differences in sex linkage associated with differences in selection pressures, but we know nothing about how fast these differences can evolve. Here we show that introduced guppy populations showing rapid evolution of male coloration also show rapid changes in sex-linkage patterns. A comparison, using hormonal manipulations in females, of introduced populations of different ages suggests a consistent increase of autosomal or X-linked coloration 2 years after introduction from high- to low-predation environments...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28107055/radiating-despite-a-lack-of-character-ecological-divergence-among-closely-related-morphologically-similar-honeyeaters-aves-meliphagidae-co-occurring-in-arid-australian-environments
#8
Eliot T Miller, Sarah K Wagner, Luke J Harmon, Robert E Ricklefs
Quantifying the relationship between form and function can inform use of morphology as a surrogate for ecology. How the strength of this relationship varies continentally can inform understanding of evolutionary radiations; for example, does the relationship break down when certain lineages invade and diversify in novel habitats? The 75 species of Australian honeyeaters (Meliphagidae) are morphologically and ecologically diverse, with species feeding on nectar, insects, fruit, and other resources. We investigated Meliphagidae ecomorphology and community structure by (1) quantifying the concordance between morphology and ecology (foraging behavior), (2) estimating rates of trait evolution in relation to the packing of ecological space, and (3) comparing phylogenetic and trait community structure across the broad environmental gradients of the continent...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28107052/trait-evolution-in-adaptive-radiations-modeling-and-measuring-interspecific-competition-on-phylogenies
#9
Magnus Clarke, Gavin H Thomas, Robert P Freckleton
The incorporation of ecological processes into models of trait evolution is important for understanding past drivers of evolutionary change. Species interactions have long been thought to be key drivers of trait evolution. However, models for comparative data that account for interactions between species are lacking. One of the challenges is that such models are intractable and difficult to express analytically. Here we present phylogenetic models of trait evolution that include interspecific competition among chosen species...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28106802/effects-of-the-truck-suspension-system-on-animal-welfare-carcass-and-meat-quality-traits-in-pigs
#10
Filipe Antônio Dalla Costa, Letícia S Lopes, Osmar Antônio Dalla Costa
The objective of this study was to assess the effects of two types of commercial suspension (leaf-spring (LS) vs. air suspension (AS)) installed on two similar double-decked trucks on blood cortisol and lactate concentration, lairage behavior, carcass skin lesions and pork quality traits of 120 crossbred pigs. The suspension type neither influenced pig behaviour in lairage nor blood cortisol and lactate concentrations (p > 0.10). However, when compared with the AS suspension system, the use of LS increased the number of skin lesions in the back and thigh (p = 0...
January 18, 2017: Animals: An Open Access Journal From MDPI
https://www.readbyqxmd.com/read/28106551/conscientiousness-is-negatively-associated-with-grey-matter-volume-in-young-apoe%C3%A9-4-carriers
#11
Lukas Kunz, Martin Reuter, Nikolai Axmacher, Christian Montag
The etiology of late onset Alzheimer's disease (LOAD) depends on multiple factors, among which the APOEɛ4 allele is the most adverse genetic determinant and conscientiousness represents an influential personality trait. A potential association of both factors with brain structure in young adulthood may constitute a constellation that sets the course toward or against the subtle disease progression of LOAD that starts decades before clinical manifestation. Hence, in the present study, we examined the modulating effects of APOEɛ4 on the relation between personality dimensions, including conscientiousness, and total grey matter volume (GMV) in young healthy adults using an a priori genotyping design...
January 18, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28106259/selection-on-parental-performance-opposes-selection-for-larger-body-mass-in-a-wild-population-of-blue-tits
#12
Caroline E Thomson, Florian Bayer, Nicholas Crouch, Samantha Farrell, Elizabeth Heap, Elizabeth Mittell, Mar Zurita-Cassinello, Jarrod D Hadfield
There is abundant evidence in many taxa for positive directional selection on body size, and yet little evidence for microevolutionary change. In many species, variation in body size is partly determined by the actions of parents, so a proposed explanation for stasis is the presence of a negative genetic correlation between direct and parental effects. Consequently, selecting genes for increased body size would result in a correlated decline in parental effects, reducing body size in the following generation...
January 20, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28106125/baba-dependent-binding-of-helicobacter-pylori-to-human-gastric-mucins-cause-aggregation-that-inhibits-proliferation-and-is-regulated-via-arss
#13
Emma C Skoog, Médea Padra, Anna Åberg, Pär Gideonsson, Ikenna Obi, Macarena P Quintana-Hayashi, Anna Arnqvist, Sara K Lindén
Mucins in the gastric mucus layer carry a range of glycan structures, which vary between individuals, can have antimicrobial effect or act as ligands for Helicobacter pylori. Mucins from various individuals and disease states modulate H. pylori proliferation and adhesin gene expression differently. Here we investigate the relationship between adhesin mediated binding, aggregation, proliferation and adhesin gene expression using human gastric mucins and synthetic adhesin ligand conjugates. By combining measurements of optical density, bacterial metabolic activity and live/dead stains, we could distinguish bacterial aggregation from viability changes, enabling elucidation of mechanisms behind the anti-prolific effects that mucins can have...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106113/genetic-risk-variants-for-metabolic-traits-in-arab-populations
#14
Prashantha Hebbar, Naser Elkum, Fadi Alkayal, Sumi Elsa John, Thangavel Alphonse Thanaraj, Osama Alsmadi
Despite a high prevalence of metabolic trait related diseases in Arabian Peninsula, there is a lack of convincingly identified genetic determinants for metabolic traits in this population. Arab populations are underrepresented in global genome-wide association studies. We genotyped 1965 unrelated Arab individuals from Kuwait using Cardio-MetaboChip, and tested SNP associations with 13 metabolic traits. Models based on recessive mode of inheritance identified Chr15:40531386-rs12440118/ZNF106/W->R as a risk variant associated with glycated-hemoglobin at close to 'genome-wide significant' p-value and five other risk variants 'nominally' associated (p-value ≤ 5...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28106080/morphological-physiological-and-anatomical-traits-of-plant-functional-types-in-temperate-grasslands-along-a-large-scale-aridity-gradient-in-northeastern-china
#15
Chengyuan Guo, Linna Ma, Shan Yuan, Renzhong Wang
At the species level, plants can respond to climate changes by changing their leaf traits; however, there is scant information regarding the responses of morphological, physiological and anatomical traits of plant functional types (PFTs) to aridity. Herein, the leaf traits of five PFTs representing 17 plant species in temperate grasslands were examined along a large-scale aridity gradient in northeastern China. The results show that leaf thickness in shrubs, perennial grasses and forbs increased with heightened aridity...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28105966/a-novel-approach-for-pathway-analysis-of-gwas-data-highlights-role-of-bmp-signaling-and-muscle-cell-differentiation-in-colorectal-cancer-susceptibility
#16
Aniket Mishra, Stuart MacGregor
Genome-wide association studies (GWAS) have revolutionized the field of gene mapping. As the GWAS field matures, it is becoming clear that for many complex traits, a proportion of the missing heritability is attributable to common variants of individually small effect. Detecting these small effects individually can be difficult, and statistical power would be increased if relevant variants could be grouped together for testing. Here, we propose a VEGAS2Pathway approach that aggregates association strength of individual markers into pre-specified biological pathways...
February 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
https://www.readbyqxmd.com/read/28105951/theoretical-implementation-of-prior-knowledge-in-the-design-of-a-multi-scale-prosthesis-satisfaction-questionnaire
#17
Tim Schürmann, Philipp Beckerle, Julia Preller, Joachim Vogt, Oliver Christ
BACKGROUND: In product development for lower limb prosthetic devices, a set of special criteria needs to be met. Prosthetic devices have a direct impact on the rehabilitation process after an amputation with both perceived technological and psychological aspects playing an important role. However, available psychometric questionnaires fail to consider the important links between these two dimensions. In this article a probabilistic latent trait model is proposed with seven technical and psychological factors which measure satisfaction with the prosthesis...
December 19, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28105932/genes-of-susceptibility-to-early-neurodegenerative-changes-in-the-rat-retina-and-brain-analysis-by-means-of-congenic-strains
#18
Elena E Korbolina, Anna A Zhdankina, Anzhela Zh Fursova, Oyuna S Kozhevnikova, Natalia G Kolosova
BACKGROUND: There has been considerable interest in discovery of the genetic architecture of complex traits, particularly age-related neurodegenerative disorders. To predict disease risk and to understand its genetic basis in humans, it is necessary to study animal models. Our previous research on the accelerated-senescence OXYS strain has revealed two quantitative trait loci (QTLs) on rat chromosome 1 that are associated with early cataract and/or retinopathy as well as with behavioral abnormalities...
December 22, 2016: BMC Genetics
https://www.readbyqxmd.com/read/28105927/candidate-snp-markers-of-aggressiveness-related-complications-and-comorbidities-of-genetic-diseases-are-predicted-by-a-significant-change-in-the-affinity-of-tata-binding-protein-for-human-gene-promoters
#19
Irina V Chadaeva, Mikhail P Ponomarenko, Dmitry A Rasskazov, Ekaterina B Sharypova, Elena V Kashina, Marina Yu Matveeva, Tatjana V Arshinova, Petr M Ponomarenko, Olga V Arkova, Natalia P Bondar, Ludmila K Savinkova, Nikolay A Kolchanov
BACKGROUND: Aggressiveness in humans is a hereditary behavioral trait that mobilizes all systems of the body-first of all, the nervous and endocrine systems, and then the respiratory, vascular, muscular, and others-e.g., for the defense of oneself, children, family, shelter, territory, and other possessions as well as personal interests. The level of aggressiveness of a person determines many other characteristics of quality of life and lifespan, acting as a stress factor. Aggressive behavior depends on many parameters such as age, gender, diseases and treatment, diet, and environmental conditions...
December 28, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28105880/nursing-home-care-quality-a-cluster-analysis
#20
Vigdis Abrahamsen Grøndahl, Liv Berit Fagerli
Purpose The purpose of this paper is to explore potential differences in how nursing home residents rate care quality and to explore cluster characteristics. Design/methodology/approach A cross-sectional design was used, with one questionnaire including questions from quality from patients' perspective and Big Five personality traits, together with questions related to socio-demographic aspects and health condition. Residents ( n=103) from four Norwegian nursing homes participated (74.1 per cent response rate)...
February 13, 2017: International Journal of Health Care Quality Assurance
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