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Amber J Brace, Marc J Lajeunesse, Daniel R Ardia, Dana M Hawley, James S Adelman, Katherine L Buchanan, Jeanne M Fair, Jennifer L Grindstaff, Kevin D Matson, Lynn B Martin
A central assumption in ecological immunology is that immune responses are costly, with costs manifesting directly (e.g., increases in metabolic rate and increased amino acid usage) or as tradeoffs with other life processes (e.g., reduced growth and reproductive success). Across taxa, host longevity, timing of maturity, and reproductive effort affect the organization of immune systems. It is reasonable, therefore, to expect that these and related factors should also affect immune activation costs. Specifically, species that spread their breeding efforts over a long lifetime should experience lower immune costs than those that mature and breed quickly and die comparatively early...
June 2017: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
Ryan J Seddon, Diana K Hews
Hormones mediate the expression of suites of correlated traits and hence may act either to facilitate or constrain adaptive evolution. Selection on one trait within a hormone-mediated suite of traits may lead to a change in the strength of the hormone signal, causing changes in correlated traits. Growing evidence suggests that melanization, which is in part regulated by hormonal signals, is tightly linked to other traits, such as aggression and stress physiology. Here, we examine six populations of Sceloporus occidentalis lizards differing in degree of melanization (three dark higher-elevation populations and three less-melanized lower-elevation populations) to investigate potential correlations between behavior, hormones, and parasites...
October 2017: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
Qiao Ni, Ying Bai, Yu Li, Liming Ling, Limin Li, Guanghai Chen, Zhaohua Wang, Haixia Ren, Feng Wu, Chuan Wu
The development of portable and wearable electronics has aroused the increasing demand for flexible energy-storage devices, especially for the characteristics of high energy density, excellent mechanical properties, simple synthesis process, and low cost. However, the development of flexible electrodes for sodium-ion batteries (SIBs) is still limited due to the intricate production methods and the relatively high-cost of current collectors such as graphene/graphene oxide and carbon nanotubes. Here, the hierarchical 3D electronic channels wrapped large-sized Na3 V2 (PO4 )3 is designed and fabricated by a simple electrospinning technique...
January 22, 2018: Small
Yan Chen, Xudong Wang, Guangjian Wu, Zhen Wang, Hehai Fang, Tie Lin, Shuo Sun, Hong Shen, Weida Hu, Jianlu Wang, Jinglan Sun, Xiangjian Meng, Junhao Chu
Van der Waals heterostructures based on 2D layered materials have received wide attention for their multiple applications in optoelectronic devices, such as solar cells, light-emitting devices, and photodiodes. In this work, high-performance photovoltaic photodetectors based on MoTe2 /MoS2 vertical heterojunctions are demonstrated by exfoliating-restacking approach. The fundamental electric properties and band structures of the junction are revealed and analyzed. It is shown that this kind of photodetectors can operate under zero bias with high on/off ratio (>105 ) and ultralow dark current (≈3 pA)...
January 22, 2018: Small
Qian Wang, Minghui Yang, Zhen-Bo Wang, Chao Li, Da-Ming Gu
Shuttle effect of the dissolved intermediates is regarded as the primary cause that leads to fast capacity degradation of Li-S battery. Herein, a microporous carbon-coated sulfur composite with novel rambutan shape (R-S@MPC) is synthesized from microporous carbon-coated rambutan-like zinc sulfide (R-ZnS@MPC), via an in situ oxidation process. The R-ZnS is employed as both template and sulfur precursor. The carbon frame of R-S@MPC composite possesses three kinds of pores that are distinctly separated from each other in space and are endowed with the exclusive functions...
January 22, 2018: Small
R Bescos, M J Boden, M L Jackson, A J Trewin, E C Marin, I Levinger, A Garnham, D S Hiam, F Falcao-Tebas, F Conte, J A Owens, D J Kennaway, G K McConell
AIM: The aim of this study was to investigate the effects of four consecutive simulated night shifts on glucose homeostasis, mitochondrial function and central and peripheral rhythmicity compared with a simulated day shift schedule. METHODS: Seventeen healthy adults (8M:9F) matched for sleep, physical activity, and dietary/fat intake participated in this study (night shift work n= 9; day shift work n= 8). Glucose tolerance and insulin sensitivity before and after 4 nights of shift work were measured by an intravenous glucose tolerance test and a hyperinsulinemic euglycemic clamp, respectively...
January 22, 2018: Acta Physiologica
Markus Meuwly, Akshaya K Das
Conversion of nitric oxide (NO) to nitrate (NO$_3^-$) by dioxygenation (NOD) protects cells from lethal NO. Starting from NO-bound heme, the first step in converting NO to benign NO$_3^-$ is the ligand exchange reaction FeNO+O$_2$ $\rightarrow$ FeO$_2$+NO which is still poorly understood at a molecular level. For WT truncated Hemoglobin N (trHbN) and its Y33A mutant the barrier for the exchange reaction differs by 1.5 kcal/mol compared with 1.7 kcal/mol from experiment. It is directly confirmed that the ligand exchange reaction is rate limiting in trHbN and that entropic contributions account for 75 \% of the difference between WT and the mutant...
January 22, 2018: Angewandte Chemie
Ariel Linden
RATIONALE, AIMS AND OBJECTIVES: Interrupted time series analysis (ITSA) is an evaluation methodology in which a single treatment unit's outcome is studied over time and the intervention is expected to "interrupt" the level and/or trend of the outcome. The internal validity is strengthened considerably when the treated unit is contrasted with a comparable control group. In this paper, we introduce a robust evaluation framework that combines the synthetic controls method (SYNTH) to generate a comparable control group and ITSA regression to assess covariate balance and estimate treatment effects...
January 22, 2018: Journal of Evaluation in Clinical Practice
D Kerr, C Axelrod, C Hoppe, D C Klonoff
The ability of an individual living with diabetes to have human-to-human contact with their healthcare provider is not keeping pace with the number of people developing diabetes. From a futurist perspective, however, this dichotomy of diabetes care represents an opportunity for digital healthcare. The focus of technological innovation is unlikely to be the replacement of the multidisciplinary diabetes team but rather the provision of meaningful individual and family support between clinic visits and, on a larger scale, the facilitation of population health management for diabetes...
January 22, 2018: Diabetic Medicine: a Journal of the British Diabetic Association
Karsten Specht, Philip Wigglesworth
The superior temporal sulcus (STS) is an anatomical structure that increasingly interests researchers. This structure appears to receive multisensory input and is involved in several perceptual and cognitive core functions, such as speech perception, audiovisual integration, (biological) motion processing and theory of mind capacities. In addition, the superior temporal sulcus is not only one of the longest sulci of the brain, but it also shows marked functional and structural asymmetries, some of which have only been found in humans...
February 2018: Scandinavian Journal of Psychology
Sayna Matinrazm, Adetola Ladejobi, Deepak Kumar Pasupula, Awais Javed, Asad Durrani, Shahzad Ahmad, Muhammad Bilal Munir, Evan Adelstein, Sandeep K Jain, Samir Saba
BACKGROUND: Although elevated body mass index (BMI) is a risk factor for cardiac disease, patients with elevated BMI have better survival in the context of severe illness, a phenomenon termed the "obesity paradox." HYPOTHESIS: Higher BMI is associated with lower mortality in sudden cardiac arrest (SCA) survivors. METHODS: Data were collected on 1433 post-SCA patients, discharged alive from the hospitals of the University of Pittsburgh Medical Center between 2002 and 2012...
January 22, 2018: Clinical Cardiology
Michael D Jenkinson, Damiano Giuseppe Barone, Andrew Bryant, Luke Vale, Helen Bulbeck, Theresa A Lawrie, Michael G Hart, Colin Watts
BACKGROUND: Extent of resection is considered to be a prognostic factor in neuro-oncology. Intraoperative imaging technologies are designed to help achieve this goal. It is not clear whether any of these sometimes very expensive tools (or their combination) should be recommended as standard care for people with brain tumours. We set out to determine if intraoperative imaging technology offers any advantage in terms of extent of resection over standard surgery and if any one technology was more effective than another...
January 22, 2018: Cochrane Database of Systematic Reviews
John H Relethford, Fred H Smith
OBJECTIVES: Ancient DNA analysis has shown that present-day humans of Eurasian ancestry are more similar to Neandertals than are present-day humans of sub-Saharan African ancestry, reflecting interbreeding after modern humans first left Africa. We use craniometric data to test the hypothesis that the crania of recent modern humans show the same pattern. MATERIALS AND METHODS: We computed Mahalanobis squared distances between a published Neandertal centroid based on 37 craniometric traits and each of 2,413 recent modern humans from the Howells global data set (N = 373 sub-Saharan Africans, N = 2,040 individuals of Eurasian descent)...
January 22, 2018: American Journal of Physical Anthropology
Resmi V Nair, Hema Santhakumar, Ramapurath S Jayasree
Cancer, a condition with uncontrolled cell division, is the second leading cause of death worldwide. The currently available techniques for the imaging and treatment of cancer have their own limitations and hence a combination of more than one modality is expected to increase the efficacy of both diagnosis and treatment. In the present study, we have developed a multimodal imaging and therapeutic system by incorporating a chemotherapeutic drug, mitoxantrone (MTX) onto PEG coated gold nanorods (GNR). Strong absorption in the near-infrared (NIR) and visible regions qualifies GNR as an efficient photothermal (PTT) agent upon irradiation with either a NIR or visible laser...
January 22, 2018: Faraday Discussions
Nobuhiko Arai, Hiroshi Kagami, Tomohiro Funabiki, Yutaka Mine, Makoto Inaba
BACKGROUND: Non-traumatic carotid artery injury with active extravasation, or carotid blowout syndrome (CBS), is relatively rare and highly difficult to treat because it is difficult to approach the lesions due to anatomical factors. It also involves quick progression and cerebral embolization risk caused by thrombi and carotid artery occlusion. Recently, covered stents were revealed to be effective for CBS. However, they have several disadvantages, such as their costs, rebleeding complications, or cerebral embolic risks...
January 17, 2018: World Neurosurgery
Nikhil R Nayak, Matthew Piazza, Andrew Milby, Jayesh P Thawani, Lachlan J Smith, Sherman C Stein, Neil R Malhotra
BACKGROUND: Ossification of the posterior longitudinal ligament (OPLL) often leads to cervical myelopathy. While multiple procedures have been shown to be effective in the treatment of OPLL, outcomes are less predictable than in degenerative cervical myelopathy and surgery is associated with high rates of complications and re-operation which affect quality of life. In this study, we perform a decision analysis utilizing post-operative complication data and health-related quality of life (HRQoL) utility scores to assess the average expected health utility and 5-year quality-adjusted life years (QALYs) associated with the most common surgical approaches for multilevel cervical OPLL...
January 16, 2018: World Neurosurgery
Alice Rolland, Guillaume Herbet, Hugues Duffau
OBJECTIVE: Little is known about the functional role of the white matter connections running within and around the right inferior parietal lobule (IPL). We used direct electrostimulation during awake surgery to investigate this connectivity and to avoid permanent deficit following resection for right IPL gliomas. METHODS: We reviewed patients who underwent awake mapping for a glioma involving the right IPL. Resection was achieved up to functional cortico-subcortical boundaries detected by electrostimulation...
January 16, 2018: World Neurosurgery
J Hardy, T C Veinot, X Yan, V J Berrocal, P Clarke, R Goodspeed, I N Gomez, D Romero, V G V Vydiswaran
Research regarding place and health has undergone a revolution due to the availability of consumer-focused location-tracking devices that reveal fine-grained details of human mobility. Such research requires that participants accept such devices enough to use them in their daily lives. There is a need for a theoretically grounded understanding of acceptance of different location-tracking technology options, and its research implications. Guided by an extended Unified Theory of Acceptance and Use of Technology (UTAUT), we conducted a 28-day field study comparing 21 chronically ill people's acceptance of two leading, consumer-focused location-tracking technologies deployed for research purposes: 1) a location-enabled smartphone, and 2) a GPS watch/activity tracker...
January 17, 2018: Journal of Biomedical Informatics
Soheila Nazari, Karim Faez, Mahyar Janahmadi
Investigation of the role of the local field potential (LFP) fluctuations in encoding the received sensory information by the nervous system remains largely unknown. On the other hand, transmission of these translation rules in information transmission between the structure of sensory stimuli and the cortical oscillations to the bio-inspired artificial neural networks operating at the efficiency of the nervous system is still a vague puzzle. In order to move towards this important goal, computational neuroscience tools can be useful so, we simulated a large-scale network of excitatory and inhibitory spiking neurons with synaptic connections consisting of AMPA and GABA currents as a model of cortical populations...
January 3, 2018: Neural Networks: the Official Journal of the International Neural Network Society
Sophia N Economidou, Dimitrios A Lamprou, Dennis Douroumis
The role of two and three-dimensional printing as a fabrication technology for sophisticated transdermal drug delivery systems is explored in literature. 3D printing encompasses a family of distinct technologies that employ a virtual model to produce a physical object through numerically controlled apparatuses. The applicability of several printing technologies has been researched for the direct or indirect printing of microneedle arrays or for the modification of their surface through drug-containing coatings...
January 17, 2018: International Journal of Pharmaceutics
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