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https://www.readbyqxmd.com/read/28428623/paper-strip-embedded-graphene-quantum-dots-a-screening-device-with-a-smartphone-readout
#1
Ruslan Álvarez-Diduk, Jahir Orozco, Arben Merkoçi
Simple, inexpensive and rapid sensing systems are very demanded for a myriad of uses. Intrinsic properties of emerging paper-based analytical devices have demonstrated considerable potential to fulfill such demand. This work reports an easy-to-use, low cost, and disposable paper-based sensing device for rapid chemical screening with a smartphone readout. The device comprises luminescent graphene quantum dots (GQDs) sensing probes embedded into a nitrocellulose matrix where the resonance energy transfer phenomenon seems to be the sensing mechanism...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28426312/safe-sex-in-the-1970s-community-practitioners-on-the-eve-of-aids
#2
Thomas R Blair
In the 1970s, groups of gay and gay-allied health professionals began to formulate guidelines for safer sexual activity, several years before HIV/AIDS. Through such organizations as the National Coalition of Gay Sexually Transmitted Disease Services, Bay Area Physicians for Human Rights, and the Sisters of Perpetual Indulgence, these practitioners developed materials that would define sexual health education for the next four decades, as well as such concepts as "bodily fluids" and the "safe sex hanky." To do so, they used their dual membership in the community and the health professions...
April 20, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28426298/mass-media-campaign-to-reduce-consumption-of-sugar-sweetened-beverages-in-a-rural-area-of-the-united-states
#3
Thomas A Farley, Hayli S Halper, Anne M Carlin, Karen M Emmerson, Kelly N Foster, Angela R Fertig
OBJECTIVES: To evaluate a mass media campaign to reduce the consumption of sugar-sweetened beverages (SSBs). METHODS: We disseminated messages emphasizing the health risks of SSBs through television, digital channels, and local organizations over 15 weeks in 2015-2016 in the Tri-Cities region of northeast Tennessee, southwest Virginia, and southeast Kentucky. We evaluated the campaign with pre- and post-telephone surveys of adults aged 18 to 45 years in the intervention area and by examining changes in beverage sales in the intervention and a matched comparison area in western Virginia...
April 20, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28426294/the-interface-among-poverty-air-mattress-industry-trends-policy-and-infant-safety
#4
Jennifer J Doering, Trina C Salm Ward
Infants can suffocate on air mattresses, even when the mattress is fully inflated. The interfacing issues of poverty, the bedbug epidemic, and changes in the design and marketing of air mattresses may be increasing consumer use of air mattresses as primary sleep environments and thus increasing the potential for infant death. Despite recent changes to improve air mattress safety labeling, the National Child Death Review Case Reporting System found that between 2004 and 2015 across 24 states, an air mattress was the incident sleep place for 108 infants whose deaths were either during sleep or in a sleep environment...
April 20, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28424770/recent-advances-in-bioink-design-for-3d-bioprinting-of-tissues-and-organs
#5
REVIEW
Shen Ji, Murat Guvendiren
There is a growing demand for alternative fabrication approaches to develop tissues and organs as conventional techniques are not capable of fabricating constructs with required structural, mechanical, and biological complexity. 3D bioprinting offers great potential to fabricate highly complex constructs with precise control of structure, mechanics, and biological matter [i.e., cells and extracellular matrix (ECM) components]. 3D bioprinting is an additive manufacturing approach that utilizes a "bioink" to fabricate devices and scaffolds in a layer-by-layer manner...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28422253/3d-printed-poly-vinylidene-fluoride-carbon-nanotube-composites-as-a-tunable-low-cost-chemical-vapour-sensing-platform
#6
Z C Kennedy, J F Christ, K A Evans, B W Arey, L E Sweet, M G Warner, R L Erikson, C A Barrett
We report the production of flexible, highly-conductive poly(vinylidene fluoride) (PVDF) and multi-walled carbon nanotube (MWCNT) composites as filament feedstock for 3D printing. This account further describes, for the first time, fused deposition modelling (FDM) derived 3D-printed objects with chemiresistive properties in response to volatile organic compounds. The typically prohibitive thermal expansion and die swell characteristics of PVDF were minimized by the presence of MWCNTs in the composites enabling straightforward processing and printing...
April 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28417187/isolation-of-viable-but-non-culturable-bacteria-from-printing-and-dyeing-wastewater-bioreactor-based-on-resuscitation-promoting-factor
#7
Yi Jin, Guojuan Gan, Xiaoyun Yu, Dongdong Wu, Li Zhang, Na Yang, Jiadan Hu, Zhiheng Liu, Lixin Zhang, Huachang Hong, Xiaoqing Yan, Yan Liang, Linxian Ding, Yonglong Pan
Printing and dyeing wastewater with high content of organic matters, high colority, and poor biochemical performance is hard to be degraded. In this study, we isolated viable but non-culturable (VBNC) bacteria from printing and dyeing wastewater with the culture media contained resuscitation promoting factor (Rpf) protein secreted by Micrococcus luteus, counted the culturable cells number with the most probable number, sequenced 16S rRNA genes, and performed polymerase chain reaction-denaturing gradient gel electrophoresis...
April 17, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28414950/a-nanobiosensor-composed-of-exfoliated-graphene-oxide-and-gold-nano-urchins-for-detection-of-gmo-products
#8
Zahra Aghili, Navid Nasirizadeh, Adeleh Divsalar, Shahram Shoeibi, Parichehreh Yaghmaei
Genetically Modified Organisms, have been entered our food chain and detection of these organisms in market products are still the main challenge for scientists. Among several developed detection/quantification methods for detection of these organisms, the electrochemical nanobiosensors are the most attended which are combining the advantages of using nanomaterials, electrochemical methods and biosensors. In this research, a novel and sensitive electrochemical nanobiosensor for detection/quantification of these organisms have been developed using nanomaterials; Exfoliated Graphene Oxide and Gold Nano-Urchins for modification of the screen-printed carbon electrode, and also applying a specific DNA probe as well as hematoxylin for electrochemical indicator...
March 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28409702/providing-health-information-to-latino-farmworkers-the-case-of-the-affordable-care-act
#9
Thomas A Arcury, Anna Jensen, Mackenzie Mann, Joanne C Sandberg, Melinda F Wiggins, Jennifer W Talton, Mark A Hall, Sara A Quandt
OBJECTIVE: Providing health program information to vulnerable communities, such as Latino farmworkers, is difficult. This analysis describes the manner in which farmworkers receive information about the Affordable Care Act, comparing farmworkers to other Latinos. METHODS: Interviews were conducted with 100 Latino farmworkers and 100 urban Latino North Carolina residents in 2015. RESULTS: Most farmworkers had received health information from a community organization...
April 14, 2017: Journal of Agromedicine
https://www.readbyqxmd.com/read/28406364/fume-emissions-from-a-low-cost-3-d-printer-with-various-filaments
#10
Evan L Floyd, Jun Wang, James L Regens
3-D printing is an additive manufacturing process involving the injection of melted thermoplastic polymers, which are then laid down in layers to achieve a pre-designed shape. The heated deposition process raises concerns of potential aerosol and volatile organic compounds (VOC) emission and exposure. The decreasing cost of desktop 3-D printers has made the use of 3-D printers more acceptable in non-industrial workplaces lacking sufficient ventilation. Meanwhile, little is known about the characteristics of 3-D printing fume emission...
April 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28402626/a-combination-of-boron-nitride-nanotubes-and-cellulose-nanofibers-for-the-preparation-of-a-nanocomposite-with-high-thermal-conductivity
#11
Xiaoliang Zeng, Jiajia Sun, Yimin Yao, Rong Sun, Jian-Bin Xu, Ching-Ping Wong
With the current development of modern electronics toward miniaturization, high-degree integration and multifunctionalization, considerable heat is accumulated, which results in the thermal failure or even explosion of modern electronics. The thermal conductivity of materials has thus attracted much attention in modern electronics. Although polymer composites with enhanced thermal conductivity are expected to address this issue, achieving higher thermal conductivity (above 10 W m(-1) K(-1)) at filler loadings below 50...
April 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28402330/injection-modulated-polarity-conversion-by-charge-carrier-density-control-via-a-self-assembled-monolayer-for-all-solution-processed-organic-field-effect-transistors
#12
Jeongkyun Roh, Taesoo Lee, Chan-Mo Kang, Jeonghun Kwak, Philippe Lang, Gilles Horowitz, Hyeok Kim, Changhee Lee
We demonstrated modulation of charge carrier densities in all-solution-processed organic field-effect transistors (OFETs) by modifying the injection properties with self-assembled monolayers (SAMs). The all-solution-processed OFETs based on an n-type polymer with inkjet-printed Ag electrodes were fabricated as a test platform, and the injection properties were modified by the SAMs. Two types of SAMs with different dipole direction, thiophenol (TP) and pentafluorobenzene thiol (PFBT) were employed, modifying the work function of the inkjet-printed Ag (4...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28402101/synergistically-enhanced-performance-of-ultrathin-nanostructured-silicon-solar-cells-embedded-in-plasmonically-assisted-multispectral-luminescent-waveguides
#13
Sung-Min Lee, Purnim Dhar, Huandong Chen, Angelo Montenegro, Lauren Liaw, Dongseok Kang, Boju Gai, Alexander V Benderskii, Jongseung Yoon
Ultrathin silicon solar cells fabricated by anisotropic wet chemical etching of single-crystalline wafer materials represent an attractive materials platform that could provide many advantages for realizing high-performance, low-cost photovoltaics. However, their intrinsically limited photovoltaic performance arising from insufficient absorption of low-energy photons demands careful design of light management to maximize the efficiency and preserve the cost-effectiveness of solar cells. Herein we present an integrated flexible solar module of ultrathin, nanostructured silicon solar cells capable of simultaneously exploiting spectral upconversion and downshifting in conjunction with multispectral luminescent waveguides and a nanostructured plasmonic reflector to compensate for their weak optical absorption and enhance their performance...
April 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28398720/immobilization-on-metal-organic-framework-engenders-high-sensitivity-for-enzymatic-electrochemical-detection
#14
Cheng Zhang, Xuerui Wang, Miao Hou, Xiaoyang Li, Xiaoling Wu, Jun Ge
The protection effect of metal-organic framework (MOF) pro-vides high stability for immobilized enzyme. The small cavities of MOFs however usually result in decreased apparent substrate affinity and enzymatic activity of immobilized enzyme, com-pared to native enzyme. We synthesized zeolitic imidazolate framework-8 (ZIF-8) with a combination of mesoporous and microporous channels for Cytochrome c (Cyt c) immobilization. Compared with native Cyt c, the immobilized Cyt c displayed increased apparent substrate affinity (Michaelis constant Km reduced by ~50%), ~128% increased enzymatic activity, and 1...
April 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28395417/-dosimetry-verification-of-radioactive-seed-implantation-with-3d-printing-template-and-ct-guidance-for-paravertebral-retroperitoneal-malignant-tumor
#15
Z Ji, Y L Jiang, F X Guo, R Peng, H T Sun, J H Fan, J J Wang
Objective: To compare the dose distributions of postoperative plans with preoperative plans for seeds implantations of paravertebral/retroperitoneal tumors assisted by 3D printing guide template and CT guidance, explore the effects of the technology for seeds implantations in dosimetry level and provide data support for the optimization and standardization in seeds implantation. Methods: Between December 2015 and July 2016, a total of 10 patients with paravertebral/retroperitoneal tumors (12 lesions) received 3D printing template assist radioactive seeds implantations in department of radiation oncology of Peking University Third Hospital, and included in the study...
April 4, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28393049/apparatus-for-histological-validation-of-in-vivo-and-ex-vivo-magnetic-resonance-imaging-of-the-human-prostate
#16
Roger M Bourne, Colleen Bailey, Edward William Johnston, Hayley Pye, Susan Heavey, Hayley Whitaker, Bernard Siow, Alex Freeman, Greg L Shaw, Ashwin Sridhar, Thomy Mertzanidou, David J Hawkes, Daniel C Alexander, Shonit Punwani, Eleftheria Panagiotaki
This article describes apparatus to aid histological validation of magnetic resonance imaging studies of the human prostate. The apparatus includes a 3D-printed patient-specific mold that facilitates aligned in vivo and ex vivo imaging, in situ tissue fixation, and tissue sectioning with minimal organ deformation. The mold and a dedicated container include MRI-visible landmarks to enable consistent tissue positioning and minimize image registration complexity. The inclusion of high spatial resolution ex vivo imaging aids in registration of in vivo MRI and histopathology data...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28391101/control-of-vocs-from-printing-press-air-emissions-by-anaerobic-bioscrubber-performance-and-microbial-community-of-an-on-site-pilot-unit
#17
D Bravo, P Ferrero, J M Penya-Roja, F J Álvarez-Hornos, C Gabaldón
A novel process consisted of an anaerobic bioscrubber was studied at the field scale for the removal of volatile organic compounds (VOCs) emitted from a printing press facility. The pilot unit worked under high fluctuating waste gas emissions containing ethanol, ethyl acetate, and 1-ethoxy-2-propanol as main pollutants, with airflows ranging between 184 and 1253 m(3) h(-1) and an average concentration of 1126 ± 470 mg-C Nm(-3). Three scrubber configurations (cross-flow and vertical-flow packings and spray tower) were tested, and cross-flow packing was found to be the best one...
April 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28388499/microfluidic-enhanced-3d-bioprinting-of-aligned-myoblast-laden-hydrogels-leads-to-functionally-organized-myofibers-in%C3%A2-vitro-and-in%C3%A2-vivo
#18
Marco Costantini, Stefano Testa, Pamela Mozetic, Andrea Barbetta, Claudia Fuoco, Ersilia Fornetti, Francesco Tamiro, Sergio Bernardini, Jakub Jaroszewicz, Wojciech Święszkowski, Marcella Trombetta, Luisa Castagnoli, Dror Seliktar, Piotr Garstecki, Gianni Cesareni, Stefano Cannata, Alberto Rainer, Cesare Gargioli
We present a new strategy for the fabrication of artificial skeletal muscle tissue with functional morphologies based on an innovative 3D bioprinting approach. The methodology is based on a microfluidic printing head coupled to a co-axial needle extruder for high-resolution 3D bioprinting of hydrogel fibers laden with muscle precursor cells (C2C12). To promote myogenic differentiation, we formulated a tailored bioink with a photocurable semi-synthetic biopolymer (PEG-Fibrinogen) encapsulating cells into 3D constructs composed of aligned hydrogel fibers...
March 23, 2017: Biomaterials
https://www.readbyqxmd.com/read/28384119/status-of-water-pollution-in-relation-to-industrialization-in-rajasthan
#19
Ritu Singh Rajput, Sonali Pandey, Seema Bhadauria
India is a large and densely populated country; its economy is largely agricultural. Making the best use of the country's manpower has always posed a challenge. Industrialization could become a dominant component of the economy and displace agriculture. Traditional livelihoods of occupational groups are threatened by the practice of disposing untreated industrial waste into rivers and bodies of water. These uncontrolled disposals impact local natural resources with negative long-term effects. Industrialization is the development of intellectual and financial trade that changes a predominantly rustic culture into a modern one...
April 6, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28380890/high-sensitivity-and-fast-response-solution-processed-polymer-photodetectors-with-polyethylenimine-ethoxylated-peie-modified-ito-electrode
#20
Yue Wang, Lijie Zhu, Yufeng Hu, Zhenbo Deng, Zhidong Lou, Yanbing Hou, Feng Teng
Most organic photodetectors utilize a bulk heterojunction (BHJ) photo-active film due to its high exciton dissociation efficiency. However, the low dark current density, a key role in determining the overall performance of photodetectors, is hardly achieved in the BHJ structure since both the donor and acceptor domains are in contact with the same electrode. The most popular strategy to overcome this problem is by fabricating bilayer or multilayer devices. However, the complicated fabrication process is a challenge for printing electronics...
April 3, 2017: Optics Express
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