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https://www.readbyqxmd.com/read/29053923/loss-and-reformation-of-ruthenium-alkylidene-connecting-olefin-metathesis-catalyst-deactivation-regeneration-and-isomerization
#1
Julien Engel, Wietse Smit, Marco Foscato, Giovanni Occhipinti, Karl W Törnroos, Vidar R Jensen
Ruthenium-based olefin metathesis catalysts are used in laboratory-scale organic synthesis across chemistry, largely thanks to their ease of handling and functional group tolerance. In spite of this robustness, these catalysts readily decompose, via little-understood pathways, to species that promote double-bond migration (isomerization) in both the 1-alkene reagents and the internal-alkene products. We have studied, using density functional theory (DFT), the reactivity of the Hoveyda-Grubbs second-generation catalyst 2 with allylbenzene, and discovered a facile new decomposition pathway...
October 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29053223/the-utility-of-adaptive-elearning-in-cervical-cytopathology-education
#2
T Danielle Samulski, Laura A Taylor, Teresa La, Chelsea R Mehr, Cindy M McGrath, Roseann I Wu
BACKGROUND: Adaptive eLearning allows students to experience a self-paced, individualized curriculum based on prior knowledge and learning ability. METHODS: The authors investigated the effectiveness of adaptive online modules in teaching cervical cytopathology. eLearning modules were created that covered basic concepts in cervical cytopathology, including artifacts and infections, squamous lesions (SL), and glandular lesions (GL). The modules used student responses to individualize the educational curriculum and provide real-time feedback...
October 20, 2017: Cancer
https://www.readbyqxmd.com/read/29051137/alzheimer-s-disease-in-social-media-content-analysis-of-youtube-videos
#3
Weizhou Tang, Kate Olscamp, Seul Ki Choi, Daniela B Friedman
BACKGROUND: Approximately 5.5 million Americans are living with Alzheimer's disease (AD) in 2017. YouTube is a popular platform for disseminating health information; however, little is known about messages specifically regarding AD that are being communicated through YouTube. OBJECTIVE: This study aims to examine video characteristics, content, speaker characteristics, and mobilizing information (cues to action) of YouTube videos focused on AD. METHODS: Videos uploaded to YouTube from 2013 to 2015 were searched with the term "Alzheimer's disease" on April 30th, 2016...
October 19, 2017: Interactive Journal of Medical Research
https://www.readbyqxmd.com/read/29049874/balancing-bacteria-osteoblasts-competition-through-selective-physical-puncture-and-biofunctionalization-of-zno-polydopamine-arginine-glycine-aspartic-acid-cysteine-nanorods
#4
Jun Li, Lei Tan, Xiangmei Liu, Zhenduo Cui, Xianjin Yang, Kelvin Wai Kwok Yeung, Paul K Chu, Shuilin Wu
Bacterial infection and lack of bone tissue integration are two major concerns of orthopedic implants. In addition, osteoinductivity often decreases and toxicity may arise when antibacterial agents are introduced to increase the antibacterial ability. Here hybrid ZnO/polydopamine (PDA)/arginine-glycine-aspartic acid-cysteine (RGDC) nanorod (NR) arrays are designed and prepared on titanium (Ti) implants to not only enhance the osteoinductivity but also effectively kill bacteria simultaneously, which are ascribed to the selective physical puncture and the biofunctionalization of ZnO/PDA/RGDC nanorods during the competition between bacteria and osteoblasts, that is, owing to the much larger size of osteoblasts than bacteria, the hybrid NRs can puncture bacteria but not damage osteoblasts...
October 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/29049565/a-low-cost-bioprosthetic-semilunar-valve-for-research-disease-modelling-and-surgical-training-applications
#5
Benoit Rosa, Zurab Machaidze, Borami Shin, Sunil Manjila, David W Brown, Christopher W Baird, John E Mayer, Pierre E Dupont
OBJECTIVES: This paper provides detailed instructions for constructing low-cost bioprosthetic semilunar valves for animal research and clinical training. This work fills an important gap between existing simulator training valves and clinical valves by providing fully functioning designs that can be employed in ex vivo and in vivo experiments and can also be modified to model valvular disease. METHODS: Valves are constructed in 4 steps consisting of creating a metal frame, covering it with fabric and attaching a suture ring and leaflets...
August 2, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29048395/environmental-risk-assessment-strategy-for-nanomaterials
#6
Janeck J Scott-Fordsmand, Willie J G M Peijnenburg, Elena Semenzin, Bernd Nowack, Neil Hunt, Danail Hristozov, Antonio Marcomini, Muhammad-Adeel Irfan, Araceli Sánchez Jiménez, Robert Landsiedel, Lang Tran, Agnes G Oomen, Peter M J Bos, Kerstin Hund-Rinke
An Environmental Risk Assessment (ERA) for nanomaterials (NMs) is outlined in this paper. Contrary to other recent papers on the subject, the main data requirements, models and advancement within each of the four risk assessment domains are described, i.e., in the: (i) materials, (ii) release, fate and exposure, (iii) hazard and (iv) risk characterisation domains. The material, which is obviously the foundation for any risk assessment, should be described according to the legislatively required characterisation data...
October 19, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29048241/nanofibrous-electrospun-hdecm-based-hybrid-scaffold-as-wound-dressing-for-reducing-scarring
#7
Tae Hee Kim, Youngmee Jung, Soo Hyun Kim
Produced via electrospinning, poly(l-lactide-co-caprolactone) (PLCL) membranes, which have a porous structure and are biodegradable, are of interest in various medical fields. The porous-structured electrospun membrane is particularly interesting because of several favorable properties: it exudes fluid from the wound, does not build up under the wound covering, and does not cause wound desiccation. Moreover, extracellular matrix (ECM)-based structures derived by tissue decellularization have application as engineered tissue scaffolds and as supports for cellular regeneration...
October 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29047748/error-analysis-of-large-diameter-subaperture-stitching-fresnel-diffractive-elements
#8
Haolin Zhang, Hua Liu, Wenbin Xu, Angel Lizana, Xiaoduo Wang, Zhenwu Lu
Image quality is dramatically influenced by the stitching errors in a large-diameter stitching Fresnel lens. In this paper, we studied three kinds of errors that can cover all stitching errors in a Cornwell deployed Fresnel lens. In particular, a 300-mm-diameter, three-belt deployed Fresnel diffractive lens was simulated to investigate the stitching error. The star test and the resolution board test experiments were conducted, and the experimental results fit the simulation results. This means that our error analysis theory and simulation method are efficient and accurate and could be used to guide future super-large aperture stitching...
September 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047683/toward-a-unified-model-for-predicting-color-quality-of-light-sources
#9
Fuzheng Zhang, Haisong Xu, Heng Feng
Considering that the existing color quality (CQ) metrics for light sources cannot correlate well with the subjective evaluation, in an immersive environment equipped with a multichannel LED light source, a psychophysical experiment by categorical judgment method was carried out to assess the three perception-related CQ attributes of light sources in terms of naturalness, colorfulness, and preference. The experiment collected the subjective responses to these attributes of up to 41 metameric spectra at each of four test correlated color temperatures (CCTs) ranging from 2800 to 6500 K, which covers the usual white-light range for general lighting...
October 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047394/esprit-ethics-committee-proposals-for-long-term-medical-data-registries-in-rapidly-evolving-research-fields-a-future-proof-best-practice-approach
#10
S Oberbichler, W O Hackl, A Hörbst
BACKGROUND: Long-term data collection is a challenging task in the domain of medical research. Many effects in medicine require long periods of time to become traceable e.g. the development of secondary malignancies based on a given radiotherapeutic treatment of the primary disease. Nevertheless, long-term studies often suffer from an initial lack of available information, thus disallowing a standardized approach for their approval by the ethics committee. This is due to several factors, such as the lack of existing case report forms or an explorative research approach in which data elements may change over time...
October 18, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/29046991/implications-of-allometric-model-selection-for-county-level-biomass-mapping
#11
Laura Duncanson, Wenli Huang, Kristofer Johnson, Anu Swatantran, Ronald E McRoberts, Ralph Dubayah
BACKGROUND: Carbon accounting in forests remains a large area of uncertainty in the global carbon cycle. Forest aboveground biomass is therefore an attribute of great interest for the forest management community, but the accuracy of aboveground biomass maps depends on the accuracy of the underlying field estimates used to calibrate models. These field estimates depend on the application of allometric models, which often have unknown and unreported uncertainties outside of the size class or environment in which they were developed...
October 18, 2017: Carbon Balance and Management
https://www.readbyqxmd.com/read/29045616/potential-impact-of-global-climate-change-on-benthic-deep-sea-microbes
#12
Roberto Danovaro, Cinzia Corinaldesi, Antonio Dell Anno, Eugenio Rastelli
Benthic deep-sea environments are the largest ecosystem on Earth, covering approximately 65% of the Earth surface. Microbes inhabiting this huge biome at all water depths represent the most abundant biological components and a relevant portion of the biomass of the biosphere, and play a crucial role in global biogeochemical cycles. Increasing evidence suggests that global climate changes are affecting also deep-sea ecosystems, both directly (causing shifts in bottom-water temperature, oxygen concentration and pH), and indirectly (through changes in surface oceans' productivity and in the consequent export of organic matter to the seafloor)...
October 13, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29044337/beneficial-effects-of-intradialytic-cardiopulmonary-rehabilitation
#13
Bruno Medeiros Guio, Carlos Perez Gomes, Fabio Brandão da Costa, Adriana Dos Santos de Oliveira, Marta Turano Duarte, Maurilo Leite
INTRODUCTION: Patients on hemodialysis (HD) present high mortality from cardiovascular complications and high morbidity, including decreasing functional capacity and quality of life. OBJECTIVE: To analyze clinical and laboratory responses of patients in HD to intradialytic cardiopulmonary rehabilitation on an outpatient basis. METHODS: We evaluated 14 patients in a prospective study for 8 months using cardiopulmonary rehabilitation protocol (CRehab) consisted of intradialytic aerobic exercise with a cycle ergometer...
July 2017: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29043408/what-is-the-cost-of-free-cleft-surgery-in-the-middle-east
#14
Samar Sheriff, Hassan J Zawahrah, Lenisa V Chang, Sonay Beyatli, Haithem M Elhadi Babiker, Ashton L Roach, Natalyia Biskup, John A van Aalst
BACKGROUND: This project explores the costs of cleft lip and/or palate surgeries in Palestine and Sudan, two low- and middle-income countries (LMIC), in the Middle East. Our purpose is to examine the veracity of advertisements from international cleft organizations claiming that "250 US dollars (USD) covers the cost of a single cleft surgery." We hypothesize that the actual cost of surgery is greater than 250 USD. METHODS: Costs for each cleft surgery were organized broadly into 5 categories: hospital charges, personnel (time and money spent for health professionals to travel to LMIC, including lost wages), tests, consumables, and reusables...
October 17, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/29042639/school-based-assessment-of-amblyopia-and-strabismus-among-multiethnic-children-in-rural-china
#15
Chen-Wei Pan, Xuejuan Chen, Hui Zhu, Zhujun Fu, Hua Zhong, Jun Li, Dan Huang, Hu Liu
We aimed to determine the prevalence and possible ethnic variations in strabismus and amblyopia among multiethnic school-aged children in rural China. A total of 9,263 children (4,347 Han, 3,352 Yi, 799 Dai and 765 Bai) aged 6 to 14 years were analyzed. Comprehensive eye examinations including monocular distance visual acuity, anterior segment examination, autorefraction, cover testing and ocular motility were conducted. Manifested strabismus was detected in 3.53% of the overall population. The prevalence of strabismus was 3...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29042510/the-misleading-narrative-of-the-canonical-faculty-productivity-trajectory
#16
Samuel F Way, Allison C Morgan, Aaron Clauset, Daniel B Larremore
A scientist may publish tens or hundreds of papers over a career, but these contributions are not evenly spaced in time. Sixty years of studies on career productivity patterns in a variety of fields suggest an intuitive and universal pattern: Productivity tends to rise rapidly to an early peak and then gradually declines. Here, we test the universality of this conventional narrative by analyzing the structures of individual faculty productivity time series, constructed from over 200,000 publications and matched with hiring data for 2,453 tenure-track faculty in all 205 PhD-granting computer science departments in the United States and Canada...
October 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29042266/development-and-validation-of-the-symptom-assessment-to-improve-symptom-control-for-institutionalized-elderly-scale
#17
Maaike L De Roo, Marc F Tanghe, Nele J Van Den Noortgate, Ruth D Piers
OBJECTIVES: To validate a newly developed multiple symptom self-assessment tool in nursing homes. DESIGN: Thirty prevalent symptoms identified in the literature were classified by a 2-round Delphi procedure to a top 10 of the most relevant, burdensome symptoms. Because no existing symptom scale fully covered this top 10, we developed a new scale, consisting of a horizontal numerical scale for the top 10 symptoms, with the possibility to add and rate 3 other symptoms...
October 14, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/29041863/clinical-outcome-measures-for-progressive-ms-trials
#18
Daniel Ontaneda, Jeffrey A Cohen, Maria Pia Amato
Treatment options for progressive multiple sclerosis remain the main unmet need of the field. As the understanding of multiple sclerosis (MS) pathogenesis improves, new pathways and molecules will be tested for potential reparative, remyelinating, or neuroprotective effects. The clinical outcomes used will determine successful demonstration of beneficial treatment effects to regulatory agencies, clinicians, and persons with MS. This review focuses on clinical outcome measures including the Expanded Disability Status Scale, Multiple Sclerosis Functional Composite, and novel composite measures of disability...
October 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29041828/urine-protein-biomarkers-for-detection-of-cardiovascular-disease-and-their-use-for-the-clinic
#19
Sarah Röthlisberger, Johanna Pedroza-Diaz
Cardiovascular disease (CVD) is the leading noncommunicable disease and main cause of death worldwide. Traditionally, blood has been the sample of choice for biomarker discovery, however, urine has roused great interest in recent years as a source of biomarkers. Sample collection is simple, non-invasive, and there is the possibility of implementing minimal cost tests in primary care settings. Areas covered: In this review, we systematically searched PubMed for proteomic studies of CVD, with the criteria that urine was included as a biological sample...
October 18, 2017: Expert Review of Proteomics
https://www.readbyqxmd.com/read/29041735/analysis-of-spurious-diffraction-orders-of-computer-generated-hologram-in-symmetric-aspheric-metrology
#20
Yiwei He, Xi Hou, Fan Wu, Xinxue Ma, Rongguang Liang
Computer-generated hologram (CGH) has been widely used as a wavefront compensator in symmetric aspheric metrology. As a diffractive element, it generates different diffraction orders, but only the 1st-order diffraction is used to test aspheric surface. The light from spurious diffraction orders (SDO) will produce many high-frequency fringes in interferogram and reduce measurement accuracy. In this paper, we regard the CGH null system as an imaging system and develop an aberration model in Seidel formalism to analyze the SDO...
August 21, 2017: Optics Express
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