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https://www.readbyqxmd.com/read/28820210/spiers-memorial-lecture-%C3%A2-progress-and-prospects-of-reticular-chemistry
#1
Bunyarat Rungtaweevoranit, Christian S Diercks, Markus J Kalmutzki, Omar M Yaghi
Reticular chemistry, the linking of molecular building units by strong bonds to make crystalline, extended structures such as metal-organic frameworks (MOFs), zeolitic imidazolate frameworks (ZIFs), and covalent organic frameworks (COFs), is currently one of the most rapidly expanding fields of science. In this contribution, we outline the origins of the field; the key intellectual and practical contributions, which have led to this expansion; and the new directions reticular chemistry is taking that are changing the way we think about making new materials and the manner with which we incorporate chemical information within structures to reach additional levels of functionality...
August 18, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28818310/fracture-analysis-of-tube-boiler-for-physical-explosion-accident
#2
Eui Soo Kim
Material and failure analysis techniques are key tools for determining causation in case of explosive and bursting accident result from material and process defect of product in the field of forensic science. The boiler rupture generated by defect of the welding division, corrosion, overheating and degradation of the material have devastating power. If weak division of boiler burner is fractured by internal pressure, saturated vapor and water is vaporized suddenly. At that time, volume of the saturated vapor and water increases up to thousands of volume...
August 3, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28817773/surface-reaction-barriometry-methane-dissociation-on-flat-and-stepped-transition-metal-surfaces
#3
Davide Migliorini, Helen Chadwick, Francesco Nattino, Ana Gutiérrez-González, Eric Dombrowski, Eric A High, Han Guo, Arthur L Utz, Bret Jackson, Rainer D Beck, Geert-Jan Kroes
Accurately simulating heterogeneously catalyzed reactions requires reliable barriers for molecules reacting at defects on metal surfaces, such as steps. However, first-principles methods capable of computing these barriers to chemical accuracy have yet to be demonstrated. We show that state-resolved molecular beam experiments combined with ab initio molecular dynamics using specific reaction parameter density functional theory (SRP-DFT) can determine the molecule-metal surface interaction with the required reliability...
August 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28817421/association-of-stop-bang-questionnaire-as-a-screening-tool-for-sleep-apnea-and-postoperative-complications-a-systematic-review-and-bayesian-meta-analysis-of-prospective-and-retrospective-cohort-studies
#4
Mahesh Nagappa, Jayadeep Patra, Jean Wong, Yamini Subramani, Mandeep Singh, George Ho, David T Wong, Frances Chung
BACKGROUND: The risk of postoperative complications increases with undiagnosed obstructive sleep apnea (OSA). The high-risk OSA (HR-OSA) patients can be easily identified using the STOP-Bang screening tool. The aim of this systematic review and meta-analysis is to determine the association of postoperative complications in patients screened as HR-OSA versus low-risk OSA (LR-OSA). METHODS: The following data bases were searched from January 1, 2008, to October 31, 2016, to identify the eligible articles: Cochrane Central Register of Controlled Trials, MEDLINE, PubMed, Cochrane Databases of Systematic Reviews, Medline-in-Process & other nonindexed citations, Google Scholar, Embase, Web of Sciences and Scopus...
August 11, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28817126/principles-for-vertical-ridge-augmentation-in-the-atrophic-posterior-mandible-a-technical-review
#5
Istvan A Urban, Alberto Monje, Jaime Lozada, Hom-Lay Wang
Guided bone regeneration has become more predictable due to advances in material sciences. Nevertheless, vertical ridge augmentation (VRA) remains a potential challenge due to the complexity of soft tissue management. This becomes more complicated in the posterior atrophic mandible due to limited access and poorer blood supply. As such, a number of critical elements must be taken into consideration in treatment planning. Anatomical structures potentially jeopardize intraoperative adverse events such as bleeding or neurosensory disturbances...
September 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28816851/clinical-practice-guideline-safe-medication-use-in-the-icu
#6
Sandra L Kane-Gill, Joseph F Dasta, Mitchell S Buckley, Sandeep Devabhakthuni, Michael Liu, Henry Cohen, Elisabeth L George, Anne S Pohlman, Swati Agarwal, Elizabeth A Henneman, Sharon M Bejian, Sean M Berenholtz, Jodie L Pepin, Mathew C Scanlon, Brian S Smith
OBJECTIVE: To provide ICU clinicians with evidence-based guidance on safe medication use practices for the critically ill. DATA SOURCES: PubMed, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, CINAHL, Scopus, and ISI Web of Science for relevant material to December 2015. STUDY SELECTION: Based on three key components: 1) environment and patients, 2) the medication use process, and 3) the patient safety surveillance system...
September 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28816430/dual-colorimetric-and-fluorescent-authentication-based-on-semiconducting-polymer-dots-for-anti-counterfeiting-applications
#7
Wei-Kai Tsai, Yung-Sheng Lai, Po-Jung Tseng, Chia-Hsien Liao, Yang-Hsiang Chan
Semiconducting polymer dots (Pdots) have recently emerged as a novel type of ultrabright fluorescent probes that can be widely used in analytical sensing and material science. Here we developed a dual visual agents based on Pdots for anti-counterfeiting applications. We first designed and synthesized two types of photoswitchable Pdots by incorporating photochromic dyes with multi-color semiconducting polymers to modulate their emission intensities and wavelengths. The resulting full-color Pdot assays showed the colorimetric and fluorescent dual-readout abilities to serve as an anti-counterfeiting reagent with low background interference...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816379/from-enzymes-to-functional-materials-towards-activation-of-small-molecules
#8
Frauke Möller, Stefan Piontek, Reece G Miller, Ulf-Peter Apfel
The design of non-noble metal containing heterogenous catalysts for the activation of small molecules is of utmost importance for our society. While nature possesses very sophisticated machineries to perform such conversions, rationally designed catalytic materials are rare. Herein, we aim to raise the awareness of the overall common design and working principles of catalysts and "break down the boundaries" between biology, chemistry and material sciences.
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28816188/assessment-of-changes-in-nickel-and-chromium-levels-in-the-gingival-crevicular-fluid-during-fixed-orthodontic-treatment
#9
Vinny Bhasin, Swati J Pustake, Viprat Joshi, Anil Tiwari, Meenakshi Bhasin, Ramandeep S Punia
BACKGROUND: Various components of appliances used in fixed orthodontic treatment are fabricated from materials that are highly resistant in nature and have high strength and biocompatibility. Corrosion of materials occurs inside the oral cavity due to numerous environmental or oral factors that act on them. These factors include temperature, pH variation, salivary conditions, mechanical loads, microbiological and enzymatic activity, and various food components. Gingival crevicular fluid (GCF) is the material obtained from the gingival sulcus and might act as a potential source for various biomarkers in the orthodontic setup because inflammatory-induced response is directly related to orthodontic forces in GCF...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815229/edge-mode-amplification-in-disordered-elastic-networks
#10
Le Yan, Jean-Philippe Bouchaud, Matthieu Wyart
Understanding how mechanical systems can be designed to efficiently transport elastic information is important in a variety of fields, including in materials science and biology. Recently, it has been discovered that certain crystalline lattices present "topologically-protected" edge modes that can amplify elastic signals. Several observations suggest that edge modes are important in disordered systems as well, an effect not well understood presently. Here we build a theory of edge modes in disordered isostatic materials and compute the distribution g(κ) of Lyapunov exponents κ characterizing how modes penetrate in the bulk, and find good agreement with numerical results...
August 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28813426/sexual-reproduction-in-plagiogrammacean-diatoms-first-insights-into-the-early-pennates
#11
Irena Kaczmarska, Benjamin S Gray, James M Ehrman, Mary Thaler
The genera Plagiogramma and Dimeregramma are members of a small, but evolutionarily important group of diatoms, the "basal" araphids. They are sister to all other pennates, both araphid and raphid taxa. Thus, their phylogenetic position carries the potential for providing insights into the earliest pennates. We documented sexual reproduction, mating system and sex cell development in the first members of the "basal" araphid clade ever investigated. The mating system in all these species involved heterothally...
2017: PloS One
https://www.readbyqxmd.com/read/28812686/interactions-of-microplastic-debris-throughout-the-marine-ecosystem
#12
REVIEW
Tamara S Galloway, Matthew Cole, Ceri Lewis
Marine microscopic plastic (microplastic) debris is a modern societal issue, illustrating the challenge of balancing the convenience of plastic in daily life with the prospect of causing ecological harm by careless disposal. Here we develop the concept of microplastic as a complex, dynamic mixture of polymers and additives, to which organic material and contaminants can successively bind to form an 'ecocorona', increasing the density and surface charge of particles and changing their bioavailability and toxicity...
April 20, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811262/probe-microscopy-methods-and-applications-in-imaging-of-biological-materials
#13
REVIEW
Alper D Ozkan, Ahmet E Topal, Fatma B Dikecoglu, Mustafa O Guler, Aykutlu Dana, Ayse B Tekinay
Atomic force microscopy is an emerging tool for investigating the biomolecular aspects of cellular interactions; however, cell and tissue analyses must frequently be performed in aqueous environment, over rough surfaces, and on complex adhesive samples that complicate the imaging process and readily facilitate the blunting or fouling of the AFM probe. In addition, the shape and surface chemistry of the probe determine the quality and types of data that can be acquired from biological materials, with certain information becoming available only within a specific range of tip lengths or diameters, or through the assistance of specific chemical or biological functionalization procedures...
August 12, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28811122/acute-kidney-injury-after-computed-tomography-a-meta-analysis
#14
REVIEW
Ryan D Aycock, Lauren M Westafer, Jennifer L Boxen, Nima Majlesi, Elizabeth M Schoenfeld, Raveendhara R Bannuru
STUDY OBJECTIVE: Computed tomography (CT) is an important imaging modality used in the diagnosis of a variety of disorders. Imaging quality may be improved if intravenous contrast is added, but there is a concern for potential renal injury. Our goal is to perform a meta-analysis to compare the risk of acute kidney injury, need for renal replacement, and total mortality after contrast-enhanced CT versus noncontrast CT. METHODS: We searched MEDLINE (PubMed), the Cochrane Library, CINAHL, Web of Science, ProQuest, and Academic Search Premier for relevant articles...
August 12, 2017: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/28810960/talk-to-the-hand-u-s-army-biophysical-testing
#15
William R Santee, Adam W Potter, Karl E Friedl
BACKGROUND: Many people are unaware of the science underlying the biophysical properties of Soldier clothing and personal protective equipment, yet there is a well-refined biomedical methodology initiated by Army physiologists in World War II. This involves a methodical progression of systematic material testing technologies, computer modeling, and human testing that enables more efficient development and rapid evaluation of new concepts for Soldier health and performance. Sophisticated manikins that sweat and move are a central part of this testing continuum...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28809473/aggregation-induced-emission-materials-with-different-electric-charges-as-an-artificial-tongue-design-construction-and-assembly-with-various-pathogenic-bacteria-for-effective-bacterial-imaging-and-discrimination
#16
Guang-Jian Liu, Sheng-Nan Tian, Cui-Yun Li, Guo-Wen Xing, Lei Zhou
Imaging-based total bacterial count and type identification of bacteria play crucial roles in clinical diagnostics, public health, biological and medical science, and environmental protection. Herein, we designed and synthesized a series of tetraphenylethenes (TPEs) functionalized with one or two aldehyde, carboxylic acid, and quaternary ammonium groups, which were successfully used as fluorescent materials for rapid and efficient staining of eight kinds of representative bacterial species, including pathogenic bacteria Vibrio cholera, Klebsiella pneumoniae, and Listeria monocytogenes and potential bioterrorism agent Yersinia pestis...
August 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28808449/efficacy-of-enamel-matrix-derivative-in-vital-pulp-therapy-a-review-of-literature
#17
REVIEW
Shariq Najeeb, Zohaib Khurshid, Muhammad Sohail Zafar, Sana Zohaib, Fahad Siddiqui
INTRODUCTION: Vital pulp therapy (VPT) aims to preserve the health and maintain life of the tooth pulp which has been compromised by caries, trauma or restorative procedures. Recently, enamel matrix derivative (EMD) has been introduced as a material for vital pulp therapy. The aim of this review is to critically analyze and summarize the available literature on EMD for VPT. METHODS AND MATERIALS: Online databases (PubMED/MEDLINE, Google Scholar, ISI Web of Science, and Wiley-Online) were searched by using the following keywords in various combinations: Enamel Matrix Derivative, Emdogain, 'Vital Pulp Therapy, 'Apexogenisis', Apexification, Pulp Capping, Endodontics, Dentine and Pulpotomy for studies indexed from January 1949 to April 2016...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28806659/single-step-method-to-fabricate-durable-superliquiphobic-coating-on-aluminum-surface-with-self-cleaning-and-anti-fogging-properties
#18
D Nanda, P Varshney, M Satapathy, S S Mohapatra, B Bhushan, A Kumar
The development of self-cleaning and anti-fogging durable superliquiphobic coatings for aluminum surfaces has raised tremendous interest in materials science. In this study, a superliquiphobic coating is fabricated on an aluminum surface by a single-step dip-coating method using 1H,1H,2H,2H-Perfluorooctyltrichlorosilane-modified SiO2 nanoparticles. The successful implementation of the aforesaid coating in different applications requires extensive investigations of its characteristics and stability. To understand the properties of the coating, surface morphology, contact angle, self-cleaning, anti-fogging, and water repellency were investigated under perturbation conditions...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805831/elucidating-screw-dislocation-driven-film-formation-of-sodium-thiosulphate-with-complex-hierarchical-molecular-assembly
#19
Deepak Dwivedi, Katerina Lepkova, Thomas Becker, Matthew R Rowles
Sodium thiosulphate (Na2S2O3) films were synthesized on carbon steel substrates through solution deposition, and a film formation growth mechanism is delineated in detail herein. Dislocation-driven film formation took place at the lower concentration of Na2S2O3 (0.1 M) studied, where screw dislocation loops were identified. Interestingly, we observed the co-existence of screw dislocation spiral loops and hierarchically-ordered molecular assembly in the film, and showed the importance of hierarchical morphology in the origin of screw dislocation...
August 14, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28805115/hindrances-to-achieve-professional-confidence-the-nurse-s-participation-in-ethical-decision-making
#20
Anne Storaker, Dagfinn Nåden, Berit Sæteren
BACKGROUND: Research suggests that nurses generally do not participate in ethical decision-making in accordance with ethical guidelines for nurses. In addition to completing their training, nurses need to reflect on and use ethically grounded arguments and defined ethical values such as patient's dignity in their clinical work. OBJECTIVES: The purpose of this article is to gain a deeper understanding of how nurses deal with ethical decision-making in daily practice...
January 1, 2017: Nursing Ethics
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