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https://www.readbyqxmd.com/read/29334165/3d-printing-of-liquid-crystal-elastomeric-actuators-with-spatially-programed-nematic-order
#1
Arda Kotikian, Ryan L Truby, John William Boley, Timothy J White, Jennifer A Lewis
Liquid crystal elastomers (LCEs) are soft materials capable of large, reversible shape changes, which may find potential application as artificial muscles, soft robots, and dynamic functional architectures. Here, the design and additive manufacturing of LCE actuators (LCEAs) with spatially programed nematic order that exhibit large, reversible, and repeatable contraction with high specific work capacity are reported. First, a photopolymerizable, solvent-free, main-chain LCE ink is created via aza-Michael addition with the appropriate viscoelastic properties for 3D printing...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333891/therapeutic-potential-of-zataria-multiflora-boiss-in-treatment-of-irritable-bowel-syndrome-ibs
#2
Mohaddese Mahboubi
Irritable Bowel syndrome (IBS), the most common chronic functional gastrointestinal disorder, is categorized as IBS-C and IBS-D, which are equivalent to Ghoolenj Rihi and Maghs Rihi in Iranian traditional medicine. One of the main applications of Zataria multiflora Boiss in traditional medicine is its efficacy in the gastrointestinal tract with symptoms such as IBS. The aim of this study was to evaluate the efficacy of Zataria multiflora essential oil in management of IBS. We used all the accessible references (electronic and published books, theses, and reports) to write this article...
January 15, 2018: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/29333755/writing-be-mindful-of-context
#3
EDITORIAL
Jill Thistlethwaite
No abstract text is available yet for this article.
February 2018: Clinical Teacher
https://www.readbyqxmd.com/read/29333748/near-infrared-light-sensitive-polyvinyl-alcohol-hydrogel-photoresist-for-spatiotemporal-control-of-cell-instructive-3d-microenvironments
#4
Xiao-Hua Qin, Xiaopu Wang, Markus Rottmar, Bradley J Nelson, Katharina Maniura-Weber
Advanced hydrogel systems that allow precise control of cells and their 3D microenvironments are needed in tissue engineering, disease modeling, and drug screening. Multiphoton lithography (MPL) allows true 3D microfabrication of complex objects, but its biological application requires a cell-compatible hydrogel resist that is sufficiently photosensitive, cell-degradable, and permissive to support 3D cell growth. Here, an extremely photosensitive cell-responsive hydrogel composed of peptide-crosslinked polyvinyl alcohol (PVA) is designed to expand the biological applications of MPL...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29333197/solving-moment-hierarchies-for-chemical-reaction-networks
#5
Supriya Krishnamurthy, Eric Smith
The study of chemical reaction networks (CRN's) is a very active field. Earlier well-known results (Feinberg 1987 Chem. Enc. Sci. 42 2229, Anderson et al 2010 Bull. Math. Biol. 72 1947) identify a topological quantity called deficiency, for any CRN, which, when exactly equal to zero, leads to a unique factorized steady-state for these networks. No results exist however for the steady states of non-zero-deficiency networks. In this paper, we show how to write the full moment-hierarchy for any non-zero-deficiency CRN obeying mass-action kinetics, in terms of equations for the factorial moments...
October 20, 2017: Journal of Physics. A, Mathematical and Theoretical
https://www.readbyqxmd.com/read/29328622/laser-induced-conversion-of-teflon-into-fluorinated-nanodiamonds-or-fluorinated-graphene
#6
Ruquan Ye, Xiao Han, Dmitry V Kosynkin, Yilun Li, Chenhao Zhang, Bo Jiang, Angel A Marti, James M Tour
Laser-assisted materials fabrication is an advance that has propelled recent carbon synthesis approaches. Direct laser writing on polyimide or lignocellulose materials by a CO2 laser has successfully transformed the substrates into hierarchical graphene. However, formation of other carbon allotropes such as diamond and fullerene remains challenging. Here we report the direct synthesis of fluorinated nanodiamonds or fluorinated graphene by treating polytetrafluoroethylene (Teflon, or PTFE) with a 9.3 μm pulsed CO2 laser under argon; no exogenous fluorine source is needed...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29328272/direct-laser-writing-combined-with-a-phase-delay-probe
#7
Shaobei Li, Chao Liang, Feifei Li, Lihong Shi, Chengwei Du, Bolin Fan, Xuliang Wang, Zhitao Zan, Hongjian Chen, Wenbo Yan
We develop on lithium niobate crystals a photorefractive direct-laser-writing approach, in which we combine in one beam both direct writing and phase-delay probing functionalities to extract the in situ information of the refractive index or the electrostatic field. The phase-delay signal, predicted well by the photorefractive theory, is used as feedback for tuning the exposure time or scanning speed of the focused laser in order to control the refractive index change (Δn) at single points and scanning lines...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328249/broadband-near-infrared-antireflection-coatings-fabricated-by-three-dimensional-direct-laser-writing
#8
Y Li, D B Fullager, E Angelbello, D Childers, G Boreman, T Hofmann
Three-dimensional direct laser writing via two-photon polymerization is used to fabricate anti-reflective structured surfaces (ARSSs) composed of subwavelength conicoid features optimized to operate over a wide bandwidth in the near-infrared range from 3700  cm-1 to 6600  cm-1 (2.7-1.52 μm). Analytic Bruggemann effective medium calculations are used to predict nominal geometric parameters such as the fill factor of the constitutive conicoid features of the anti-reflective structured surfaces (ARSSs) presented here...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327925/writing-theory-and-modeling-papers-for-langmuir-the-good-the-bad-and-the-ugly
#9
David S Sholl, Zuihof Han, Shu-Hong Yu
Langmuir has a long tradition of publishing excellent theory and modeling papers. As of the time of writing, for example, two modeling papers from 2013 are among the most cited 10 papers in Langmuir from that year [1,2] and the most cited paper from Langmuir in 2016 is a theory and modeling paper [3]. At the same time, many manuscripts using theory and modeling are submitted to Langmuir but are ultimately rejected. Although Langmuir has a mandate to publish the highest quality work of all kinds relevant to interface science, there are some issues that exist that are specific to considering work based on theory and modeling...
January 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29327690/laser-direct-writing-by-two-photon-polymerization-of-3d-honeycomb-like-structures-for-bone-regeneration
#10
Irina Alexandra Paun, Roxana Cristina Popescu, Cosmin Catalin Mustaciosu, Marian Zamfirescu, Bogdan Stefanita Calin, Mona Mihailescu, Maria Dinescu, Andrei Popescu, Diana Georgiana Chioibasu, Mihai Sopronyi, Catalin Luculescu
A major limitation of existing 3D implantable structures for bone tissue engineering is that most of the cells rapidly attach on the outer edges of the structure, restricting the cells penetration into the inner parts and causing the formation of a necrotic core. Furthermore, these structures generally possess a random spatial arrangement and do not preserve the isotropy on the whole volume. Here, we report on the fabrication and testing of an innovative 3D hierarchical, honeycomb-like structure (HS), with reproducible and isotropic arhitecture, that allows "in volume" migration of osteoblasts...
January 12, 2018: Biofabrication
https://www.readbyqxmd.com/read/29327578/rapid-light-driven-color-transition-of-novel-photo-responsive-polydiacetylene-molecules
#11
Jiseok Lee, Sungbaek Seo, Jinsang Kim
We developed new photo-responsive polydiacetylene (PR-PDA) molecules by incorporating a photo-cleavable moiety, 6-nitropiperonyl alcohol (NP) or 4, 5-dimethoxy-2-nitrobenzyl alcohol (DMN), into a self-assembling diacetylene molecule. Inducing steric disordering of the assembled PDA molecules by the cleavage of the photo-responsive moiety under 365 nm UV irradiation results in color transition from blue to red and development of red fluorescence, allowing convenient photo patterning. Further writing and erasing of fluorescence patterns are demonstrated toward novel secure information communication and anti-counterfeiting applications...
January 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29326103/understanding-the-complex-relationship-between-critical-thinking-and-science-reasoning-among-undergraduate-thesis-writers
#12
Jason E Dowd, Robert J Thompson, Leslie A Schiff, Julie A Reynolds
Developing critical-thinking and scientific reasoning skills are core learning objectives of science education, but little empirical evidence exists regarding the interrelationships between these constructs. Writing effectively fosters students' development of these constructs, and it offers a unique window into studying how they relate. In this study of undergraduate thesis writing in biology at two universities, we examine how scientific reasoning exhibited in writing (assessed using the Biology Thesis Assessment Protocol) relates to general and specific critical-thinking skills (assessed using the California Critical Thinking Skills Test), and we consider implications for instruction...
2018: CBE Life Sciences Education
https://www.readbyqxmd.com/read/29325140/optimism-for-the-future-in-younger-and-older-adults
#13
Kelly A Durbin, Sarah J Barber, Maddalena Brown, Mara Mather
Objectives: Research has suggested that older adults are less optimistic about their future than younger adults; however, a limitation of prior studies is that younger and older adults were forecasting to different ages and stages of life. To address this, we investigated whether there are age differences in future optimism when people project to the exact same age. We also tested whether optimism differs when projecting one's own future versus another person's future. Method: Participants were 285 younger and 292 older adults recruited from Amazon Mechanical Turk...
January 9, 2018: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/29323981/a-good-mentor-will-never-make-you-feel-like-a-burden
#14
Ruth Stone
Ruth Stone, at the time of writing a final-year student at the University of East Anglia, reflects on the importance of an approachable, encouraging and sometimes challenging mentor for students on placement.
January 11, 2018: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/29323626/a-scenario-based-cognitive-behavioral-therapy-mobile-app-to-reduce-dysfunctional-beliefs-in-individuals-with-depression-a-randomized-controlled-trial
#15
Ji-Won Hur, Boram Kim, Dasom Park, Sung-Won Choi
INTRODUCTION: While self-administered mobile app-based cognitive behavioral therapy (CBT) has shown efficiency and effectiveness over the past decade, attempts to address automatic and negative beliefs have been lacking. The purpose of this study was to introduce and verify a mobile app that directly intervenes in dysfunctional thoughts. This app-based treatment includes recognizing automatic and negative thoughts of the protagonist of scenarios, writing advice directly to the main character, and sharing advice provided by other participants...
January 11, 2018: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/29323539/an-introduction-to-kristof-s-theorem-for-solving-least-square-optimization-problems-without-calculus
#16
Niels Waller
Kristof's Theorem (Kristof, 1970 ) describes a matrix trace inequality that can be used to solve a wide-class of least-square optimization problems without calculus. Considering its generality, it is surprising that Kristof's Theorem is rarely used in statistics and psychometric applications. The underutilization of this method likely stems, in part, from the mathematical complexity of Kristof's ( 1964 , 1970 ) writings. In this article, I describe the underlying logic of Kristof's Theorem in simple terms by reviewing four key mathematical ideas that are used in the theorem's proof...
January 11, 2018: Multivariate Behavioral Research
https://www.readbyqxmd.com/read/29322076/a-spline-based-regression-parameter-set-for-creating-customized-dartel-mri-brain-templates-from-infancy-to-old-age
#17
Marko Wilke
This dataset contains the regression parameters derived by analyzing segmented brain MRI images (gray matter and white matter) from a large population of healthy subjects, using a multivariate adaptive regression splines approach. A total of 1919 MRI datasets ranging in age from 1-75 years from four publicly available datasets (NIH, C-MIND, fCONN, and IXI) were segmented using the CAT12 segmentation framework, writing out gray matter and white matter images normalized using an affine-only spatial normalization approach...
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29321709/the-probable-prevalence-and-sociodemographic-characteristics-of-specific-learning-disorder-in-primary-school-children-in-edirne
#18
Işık Görker, Leyla Bozatli, Ümran Korkmazlar, Meltem Yücel Karadağ, Cansın Ceylan, Ceren Söğüt, Hasan Cem Aykutlu, Büşra Subay, Nesrin Turan
Introduction: The aim of this study was to research the probable prevalence of Specific Learning Disorder (SLD) in primary school children in Edirne City and the relationships with their sociodemographic characteristics. Methods: The sample of our study was composed of 2,174 children who were educated in primary schools in second, third, and fourth grades in the academic year 2013-2014 in Edirne City. The teachers and parents of these children were given Specific Learning Difficulties Symptom Scale, Learning Disabilities Symptoms Checklist (teacher and parent forms), and sociodemographic data forms to fill in...
December 2017: Noro Psikiyatri Arsivi
https://www.readbyqxmd.com/read/29321491/selective-6h-sic-white-light-emission-by-picosecond-laser-direct-writing
#19
Sicong Wang, Lingfei Ji, Lin Li, Yan Wu, Yongzhe Zhang, Zhenyuan Lin
Displaying a full or tuneable emission spectrum with highly efficient is significant for luminescent materials used in solid-state lighting. Silicon carbide (SiC) has potential for use in photoelectric devices that operate under extreme conditions. In this paper, we present a method to selectively modify the photoluminescence (PL) properties of SiC by ultrafast laser direct writing. Based on this method, visible white PL could be observed by the naked eye at room temperature under ultraviolet excitation. By increasing the laser power intensity from 40 to 80 MW/cm2, the PL of the irradiated samples increased and pure white sunlight-like emission with controlled colour temperature was realised...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321068/psychosocial-issues-discovered-through-reflective-group-dialogue-between-medical-students
#20
Shao-Yin Chu, Chi-Wei Lin, Meei-Ju Lin, Chin-Chen Wen
BACKGROUND: The biopsychosocial model is a comprehensive approach emphasizing holistic medical care. However, medical curricula that incorporate narrative reflective writing and group dynamic discussion of psychosocial issues among patients and their family members in reflective dialogue groups are currently underutilized. The aim of this study was to determine psychosocial issues among patients and their family members through medical students' reflective dialogue groups. METHODS: This study was completed as part of a pediatric clerkship...
January 10, 2018: BMC Medical Education
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