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https://www.readbyqxmd.com/read/29343646/role-of-boundary-conditions-in-determining-cell-alignment-in-response-to-stretch
#1
Kellen Chen, Andrea Vigliotti, Mattia Bacca, Robert M McMeeking, Vikram S Deshpande, Jeffrey W Holmes
The ability of cells to orient in response to mechanical stimuli is essential to embryonic development, cell migration, mechanotransduction, and other critical physiologic functions in a range of organs. Endothelial cells, fibroblasts, mesenchymal stem cells, and osteoblasts all orient perpendicular to an applied cyclic stretch when plated on stretchable elastic substrates, suggesting a common underlying mechanism. However, many of these same cells orient parallel to stretch in vivo and in 3D culture, and a compelling explanation for the different orientation responses in 2D and 3D has remained elusive...
January 17, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29343455/adolescent-social-stress-increases-anxiety-like-behavior-and-alters-synaptic-transmission-without-influencing-nicotine-responses-in-a-sex-dependent-manner
#2
Michael J Caruso, Nicole A Crowley, Dana E Reiss, Jasmine I Caulfield, Bernhard Luscher, Sonia A Cavigelli, Helen M Kamens
Early-life stress is a risk factor for comorbid anxiety and nicotine use. Because little is known about the factors underlying this comorbidity, we investigated the effects of adolescent stress on anxiety-like behavior and nicotine responses within individual animals. Adolescent male and female C57BL/6J mice were exposed to chronic variable social stress (CVSS; repeated cycles of social isolation + social reorganization) or control conditions from postnatal days (PND) 25-59. Anxiety-like behavior and social avoidance were measured in the elevated plus-maze (PND 61-65) and social approach-avoidance test (Experiment 1: PND 140-144; Experiment 2: 95-97), respectively...
January 14, 2018: Neuroscience
https://www.readbyqxmd.com/read/29341329/violence-and-child-mental-health-in-brazil-the-itabora%C3%A3-youth-study-methods-and-findings
#3
I A Bordin, C S Duarte, W S Ribeiro, C S Paula, E S F Coutinho, A Sourander, J A Rønning
OBJECTIVES: To demonstrate a study design that could be useful in low-resource and violent urban settings and to estimate the prevalence of child violence exposure (at home, community, and school) and child mental health problems in a low-income medium-size city. METHODS: The Itaboraí Youth Study is a Norway-Brazil collaborative longitudinal study conducted in Itaboraí city (n = 1409, 6-15 year olds). A 3-stage probabilistic sampling plan (random selection of census units, eligible households, and target child) generated sampling weights that were used to obtain estimates of population prevalence rates...
January 17, 2018: International Journal of Methods in Psychiatric Research
https://www.readbyqxmd.com/read/29320422/feasibility-of-detecting-natural-frequencies-of-hydraulic-turbines-while-in-operation-using-strain-gauges
#4
David Valentín, Alexandre Presas, Matias Bossio, Mònica Egusquiza, Eduard Egusquiza, Carme Valero
Nowadays, hydropower plays an essential role in the energy market. Due to their fast response and regulation capacity, hydraulic turbines operate at off-design conditions with a high number of starts and stops. In this situation, dynamic loads and stresses over the structure are high, registering some failures over time, especially in the runner. Therefore, it is important to know the dynamic response of the runner while in operation, i.e., the natural frequencies, damping and mode shapes, in order to avoid resonance and fatigue problems...
January 10, 2018: Sensors
https://www.readbyqxmd.com/read/29310309/chromatographic-column-evaluation-for-the-untargeted-profiling-of-glucosinolates-in-cauliflower-by-means-of-ultra-high-performance-liquid-chromatography-coupled-to-high-resolution-mass-spectrometry
#5
Anna Laura Capriotti, Chiara Cavaliere, Giorgia La Barbera, Carmela Maria Montone, Susy Piovesana, Riccardo Zenezini Chiozzi, Aldo Laganà
The untargeted profiling is a promising approach for the characterization of secondary metabolites in biological matrices. Thanks to the recent rapid development of high-resolution mass spectrometry (HRMS) instrumentations, the number of applications by untargeted approaches for biological samples profiling has widely increased in the recent years. Despite the high potentialities of HRMS, however, a major issue in natural products analysis often arises in the upstream process of compounds separation. A separation technique is necessary to avoid phenomena such as signal suppression, and it is especially needed in the presence of isomeric metabolites, which are otherwise indistinguishable...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29248565/person-centered-examination-of-salivary-cortisol-and-alpha-amylase-responses-to-psychosocial-stress-links-to-preadolescent-behavioral-functioning-and-coping
#6
Jason José Bendezú, Martha E Wadsworth
This study adopted a person-centered approach to identify preadolescent salivary cortisol (sC) and alpha-amylase (sAA) co-activation response patterns and examine links to behavioral functioning and coping. Children (N = 151, 51.7% male) were exposed to the Trier Social Stress Test (TSST) and one of two randomly-assigned, post-TSST coping conditions: distraction or avoidance. Multi-trajectory modeling yielded four child subgroups. Child internalizing and externalizing positively predicted High sC-High sAA relative to Low sC-Low sAA and Low sC-High sAA relative to High sC-Low sAA subgroup membership, respectively...
December 14, 2017: Biological Psychology
https://www.readbyqxmd.com/read/29211774/food-restriction-reduces-neurogenesis-in-the-avian-hippocampal-formation
#7
Barbara-Anne Robertson, Lucy Rathbone, Giselda Cirillo, Richard B D'Eath, Melissa Bateson, Timothy Boswell, Peter W Wilson, Ian C Dunn, Tom V Smulders
The mammalian hippocampus is particularly vulnerable to chronic stress. Adult neurogenesis in the dentate gyrus is suppressed by chronic stress and by administration of glucocorticoid hormones. Post-natal and adult neurogenesis are present in the avian hippocampal formation as well, but much less is known about its sensitivity to chronic stressors. In this study, we investigate this question in a commercial bird model: the broiler breeder chicken. Commercial broiler breeders are food restricted during development to manipulate their growth curve and to avoid negative health outcomes, including obesity and poor reproductive performance...
2017: PloS One
https://www.readbyqxmd.com/read/29205169/potential-for-thermal-damage-to-the-blood-brain-barrier-during-craniotomy-procedure-implications-for-intracortical-recording-microelectrodes
#8
Andrew Shoffstall, Jennifer Paiz, David Miller, Griffin Rial, Mitchell Willis, Dhariyat Menendez, Stephen Hostler, Jeffrey R Capadona
Our objective was to determine how readily blood-brain barrier (BBB) disruption occurred as a result of bone drilling during a craniotomy to implant microelectrodes in rat cortex. While the phenomenon of heat production during bone-drilling is well-known, practices to evade damage to the underlying brain tissue are inconsistently practiced and reported in the literature. Approach: We conducted a review of intracortical microelectrode literature to summarize typical approaches to mitigate drill heating during rodent craniotomies...
December 5, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29199009/characterization-mechanistic-analysis-and-improving-the-properties-of-denture-adhesives
#9
Afsoon Fallahi, Nona Khadivi, Nima Roohpour, Andrew M Middleton, Mehdi Kazemzadeh-Narbat, Nasim Annabi, Ali Khademhosseini, Ali Tamayol
OBJECTIVE: Denture adhesives are widely used to avoid the detachment and sliding of dentures. However, the adhesion properties can be affected by variation in mouth conditions such as the level of salivation. The objective of this study was to understand the effect of environmental conditions on the adhesion properties of a commercially available denture adhesive named as Poligrip® Free manufactured by GlaxoSmithKline Ltd., UK and to identify the reasons for the observed variation in its adhesion strength...
November 30, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29184524/a-qualitative-approach-on-motives-and-aspects-of-risks-in-freeriding
#10
Anika Frühauf, Will A S Hardy, Daniel Pfoestl, Franz-Georg Hoellen, Martin Kopp
Recent research has shown that there are multiple motives for participation in high-risk sport; however these results have come from studies that consider a number of different sports. Therefore, the aim of the present study was to better understand the motives and risk-related aspects of freeriding, using a qualitative approach. Semi-structured interviews were conducted with 40 professional and semi-professional freeride skiers and snowboarders. All freeriders were highly experienced, of different age (19-44 years; 27...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29174049/neural-responses-to-one-s-own-name-under-mortality-threat
#11
Xiaoyue Fan, Shihui Han
Recent behavioral research has shown evidence for greater inclination to avoid symbolic cues of mortality threats in nonbelievers than Christians. However, the neurocognitive mechanisms underlying religious influences on behavioral tendency to avoid mortality threats remain unknown. We tested the hypothesis of distinct arousal/attention-related brain responses to self-related information under mortality in in nonbelievers and Christians. We recorded event-related brain potentials (ERPs) from Christians and nonbelievers while they viewed their own names and a stranger's name (i...
November 22, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29166220/does-the-cognitive-reflection-test-actually-capture-heuristic-versus-analytic-reasoning-styles-in-older-adults
#12
Christopher Hertzog, R Marit Smith, Robert Ariel
Background/Study Context: This study evaluated adult age differences in the original three-item Cognitive Reflection Test (CRT; Frederick, 2005, The Journal of Economic Perspectives, 19, 25-42) and an expanded seven-item version of that test (Toplak et al., 2013, Thinking and Reasoning, 20, 147-168). The CRT is a numerical problem-solving test thought to capture a disposition towards either rapid, intuition-based problem solving (Type I reasoning) or a more thoughtful, analytical problem-solving approach (Type II reasoning)...
November 22, 2017: Experimental Aging Research
https://www.readbyqxmd.com/read/29157236/monitoring-of-nutrient-limitation-in-growing-e-coli-a-mathematical-model-of-a-ppgpp-based-biosensor
#13
Alexandra Pokhilko
BACKGROUND: E. coli can be used as bacterial cell factories for production of biofuels and other useful compounds. The efficient production of the desired products requires careful monitoring of growth conditions and the optimization of metabolic fluxes. To avoid nutrient depletion and maximize product yields we suggest using a natural mechanism for sensing nutrient limitation, related to biosynthesis of an intracellular messenger - guanosine tetraphosphate (ppGpp). RESULTS: We propose a design for a biosensor, which monitors changes in the intracellular concentration of ppGpp by coupling it to a fluorescent output...
November 21, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/29142467/non-celiac-gluten-sensitivity-all-wheat-attack-is-not-celiac
#14
REVIEW
Samuel O Igbinedion, Junaid Ansari, Anush Vasikaran, Felicity N Gavins, Paul Jordan, Moheb Boktor, Jonathan S Alexander
Currently, 1% of the United States population holds a diagnosis for celiac disease (CD), however, a more recently recognized and possibly related condition, "non-celiac gluten sensitivity" (NCGS) has been suggested to affect up to 6% of the United States public. While reliable clinical tests for CD exist, diagnosing individuals affected by NCGS is still complicated by the lack of reliable biomarkers and reliance upon a broad set of intestinal and extra intestinal symptoms possibly provoked by gluten. NCGS has been proposed to exhibit an innate immune response activated by gluten and several other wheat proteins...
October 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29136838/a-robotic-magnetic-nanoparticle-solid-phase-extraction-system-coupled-to-flow-batch-analyzer-and-gfaas-for-determination-of-trace-cadmium-in-edible-oils-without-external-pretreatment
#15
Inakã S Barreto, Stefani I E Andrade, Francisco A S Cunha, Marcelo B Lima, Mario Cesar U Araujo, Luciano F Almeida
A lab-made magnetic-mechanical robotic (MMR) system coupled to a flow-batch analyzer (FBA) for magnetic nanoparticles solid phase extraction (MSPE) is presented. As an illustrative application, an NMR-FBA couple was connected to a graphite furnace atomic absorption spectrometer (GFAAS) for quantification of trace cadmium in edible oils. Factors affecting MSPE, such as the amount of adsorbent, the type, concentration and volume of the eluent and elution time were studied. Under the optimized experimental conditions, the interferents studied did not reveal a significant change in the analytical response, indicating that proposed method is selective...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29122653/validation-of-an-automated-bilateral-feet-cold-pressor-test
#16
Petra Bachmann, Xinwei Zhang, Mauro F Larra, Dagmar Rebeck, Karsten Schönbein, Klaus P Koch, Hartmut Schächinger
The Cold Pressor Test (CPT) is often used in psychobiological research. However, the classical CPT version (unilateral hand immersion into ice-water) involves some disadvantages: hands may be needed for further applications, attentional drift towards the affected sensory hemi-field and/or physiological activation of the contralateral hemisphere may produce a laterality bias. Furthermore, instruction-induced motor activity may bias physiologic reactivity. To avoid these problems, a fully automated bilateral feet CPT was developed and tested for validity and feasibility...
November 6, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29104536/the-endocannabinoid-system-differentially-regulates-escape-behavior-in-mice
#17
Andreas J Genewsky, Carsten T Wotjak
Among the hardwired behaviors, fear or survival responses certainly belong to the most evolutionary conserved ones. However, higher animals possess the ability to adapt to certain environments (e.g., novel foraging grounds), and, therefore, those responses need to be plastic. Previous studies revealed a cell-type specific role of the endocannabinoid system in novelty fear, conditioned fear and active vs. passive avoidance in a shuttle box paradigm. In this study we aim to investigate, whether knocking-out the cannabinoid receptor type-1 (CB1) on cortical glutamatergic (Glu-CB1(-/-)) or GABAergic (GABA-CB1(-/-)) neurons differentially affects the level of behavioral inhibition, which could ultimately lead to differences in escape behavior...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29093732/dynamic-gene-resource-landscape-management-of-norway-spruce-combining-utilization-and-conservation
#18
Milan Lstibůrek, Yousry A El-Kassaby, Tore Skrøppa, Gary R Hodge, Jørn H Sønstebø, Arne Steffenrem
Traditional gene-resource management programs for forest trees are long-term endeavors requiring sustained organizational commitment covering extensive landscapes. While successful in maintaining adaptation, genetic diversity and capturing traditional growth attributes gains, these programs are dependent on rigid methods requiring elaborate mating schemes, thus making them slow in coping with climate change challenges. Here, we review the significance of Norway spruce in the boreal region and its current management practices...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29078337/importance-of-a-species-socioecology-wolves-outperform-dogs-in-a-conspecific-cooperation-task
#19
Sarah Marshall-Pescini, Jonas F L Schwarz, Inga Kostelnik, Zsófia Virányi, Friederike Range
A number of domestication hypotheses suggest that dogs have acquired a more tolerant temperament than wolves, promoting cooperative interactions with humans and conspecifics. This selection process has been proposed to resemble the one responsible for our own greater cooperative inclinations in comparison with our closest living relatives. However, the socioecology of wolves and dogs, with the former relying more heavily on cooperative activities, predicts that at least with conspecifics, wolves should cooperate better than dogs...
October 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29078038/influence-of-supraphysiological-cortisol-manipulation-on-predator-avoidance-behaviours-and-physiological-responses-to-a-predation-threat-in-a-wild-marine-teleost-fish
#20
Michael J Lawrence, Erika J Eliason, Jacob W Brownscombe, Kathleen M Gilmour, John W Mandelman, Lee F G Gutowsky, Steven J Cooke
The stress axis in teleost fish attempts to maintain internal homeostasis in the face of allostatic loading. However, stress axis induction has been associated with a higher predation rate in fish. To date, the physiological and behavioural factors associated with this outcome are poorly understood. The purpose of the present study was to investigate the impact of experimental cortisol elevation on anti-predator behaviour and physiological responses to predator presence. We hypothesized that semi-chronic cortisol elevation would increase susceptibility to predation by increasing stress-induced risk taking behaviours...
October 27, 2017: Integrative Zoology
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