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https://www.readbyqxmd.com/read/27913187/molecular-recognition-of-a-lipophilic-guanosine-derivative-in-langmuir-films-at-the-air-water-interface
#1
Lucija Čoga, Lea Spindler, Stefano Masiero, Irena Drevenšek-Olenik
Molecular recognition of a lipophilic deoxyguanosine derivative at the air-water interface was investigated by film balance experiments and Brewster Angle Microscopy. Results showed that guanosine, despite strong tendency towards self-assembly, interacts with both complementary and noncomplementary liponucleosides (lipophilic derivatives of deoxycytidine and deoxythymidine). At surface pressures below 17 mN/m, attractive and repulsive interactions were present in case of both mixed monolayers and were strongest at guanosine molar fractions of 0...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27876224/microenvironmental-air-quality-impact-of-a-commercial-scale-biomass-heating-system
#2
Zheming Tong, Bo Yang, Philip K Hopke, K Max Zhang
Initiatives to displace petroleum and climate change mitigation have driven a recent increase in space heating with biomass combustion. However, there is ample evidence that biomass combustion emits significant quantities of health damaging pollutants. We investigated the near-source micro-environmental air quality impact of a biomass-fueled combined heat and power system equipped with an electrostatic precipitator (ESP) in Syracuse, NY. Two rooftop sampling stations with PM2.5 and CO2 analyzers were established in such that one could capture the plume while the other one served as the background for comparison depending on the wind direction...
November 18, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27872793/improved-methods-to-produce-tissue-engineered-skin-substitutes-suitable-for-the-permanent-closure-of-full-thickness-skin-injuries
#3
Danielle Larouche, Laurence Cantin-Warren, Maxime Desgagné, Rina Guignard, Israël Martel, Akram Ayoub, Amélie Lavoie, Robert Gauvin, François A Auger, Véronique J Moulin, Lucie Germain
There is a clinical need for skin substitutes to replace full-thickness skin loss. Our group has developed a bilayered skin substitute produced from the patient's own fibroblasts and keratinocytes referred to as Self-Assembled Skin Substitute (SASS). After cell isolation and expansion, the current time required to produce SASS is 45 days. We aimed to optimize the manufacturing process to standardize the production of SASS and to reduce production time. The new approach consisted in seeding keratinocytes on a fibroblast-derived tissue sheet before its detachment from the culture plate...
2016: BioResearch Open Access
https://www.readbyqxmd.com/read/27801561/chitin-nanofibers-extracted-from-crab-shells-in-broadband-visible-anti-reflection-coatings-with-controlling-layer-by-layer-deposition-and-the-application-for-durable-anti-fog-surfaces
#4
Kengo Manabe, Chie Tanaka, Yukari Moriyama, Mizuki Tenjimbayashi, Chiaki Nakamura, Yuki Tokura, Takeshi Matsubayashi, KyuHong Kyung, Seimei Shiratori
Reflection from various surfaces of many optical systems, such as photovoltaics and displays, is critical issue for their performances, and anti-reflection coatings play a pivotal role in a wide variety of optical technologies, which reduce light reflectance loss and hence maximize light transmission. With the current movement towards optically transparent polymeric media and coatings for anti-reflection technology, the need for economical and environmentally friendly materials and methods without dependence on shape or size has clearly been apparent...
November 1, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27800680/highly-efficient-air-desulfurization-on-self-assembled-bundles-of-copper-hydroxide-nanorods
#5
Dimitrios A Giannakoudakis, Mingyung Jiang, Teresa J Bandosz
Copper hydroxide and copper hydroxyl nitrate were successfully synthesized from copper nitrate. A slight alteration of a base addition pathway led to entirely different chemical and crystal structures. Structural, morphological and surface chemical features were analyzed using various physical and chemical methods. The copper hydroxide texture consists of self-assembled bundles of nanorods with a diameter between 15 and 40 nm. They are stack together forming platelet-like particles. In the case of the copper hydroxyl nitrate, platelet-like particles with smooth surface were detected...
November 1, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27750431/elemental-analysis-of-chinese-black-inks-on-xuan-paper-by-arf-laser-excited-plume-fluorescence
#6
Yue Cai, Zhengyu Huang, Michelle Hoi Ching Cheung, Vincent Motto-Ros, Po-Chun Chu, Yuanwei Wang, Haoyi Zhong, Ronald Yuen, Kelvin Sze-Yin Leung, Judy T S Lum, Sut Kam Phoebe Ho, Nai Ho H Cheung
Chemical analysis of Chinese black ink on xuan paper is useful for the authentication of Asian artwork. The analysis has to be non-destructive and has to accommodate artworks of all sizes. We apply three analytical techniques, ArF laser-induced plume fluorescence, Fourier transform infra-red (FTIR) spectroscopy and portable X-ray fluorescence (pXRF) to analyze five commercial Chinese black inks on two kinds of xuan paper. The FTIR signal is found to be interfered by the substrate which is inevitable because the pigments diffuse extensively into the xuan fiber network...
October 18, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27741498/in%C3%A2-vitro-3d-corneal-tissue-model-with-epithelium-stroma-and-innervation
#7
Siran Wang, Chiara E Ghezzi, Rachel Gomes, Rachel E Pollard, James L Funderburgh, David L Kaplan
The interactions between corneal nerve, epithelium, and stroma are essential for maintaining a healthy cornea. Thus, corneal tissue models that more fully mimic the anatomy, mechanical properties and cellular components of corneal tissue would provide useful systems to study cellular interactions, corneal diseases and provide options for improved drug screening. Here a corneal tissue model was constructed to include the stroma, epithelium, and innervation. Thin silk protein film stacks served as the scaffolding to support the corneal epithelial and stromal layers, while a surrounding silk porous sponge supported neuronal growth...
October 4, 2016: Biomaterials
https://www.readbyqxmd.com/read/27734318/deep-learning-architecture-for-air-quality-predictions
#8
Xiang Li, Ling Peng, Yuan Hu, Jing Shao, Tianhe Chi
With the rapid development of urbanization and industrialization, many developing countries are suffering from heavy air pollution. Governments and citizens have expressed increasing concern regarding air pollution because it affects human health and sustainable development worldwide. Current air quality prediction methods mainly use shallow models; however, these methods produce unsatisfactory results, which inspired us to investigate methods of predicting air quality based on deep architecture models. In this paper, a novel spatiotemporal deep learning (STDL)-based air quality prediction method that inherently considers spatial and temporal correlations is proposed...
October 13, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27690403/first-measurements-of-the-nitrogen-isotopic-composition-of-nox-from-biomass-burning
#9
Dorothy Louise Fibiger, Meredith G Hastings
The nitrogen isotopic composition (δ(15)N) of NOx (NO + NO2) was measured during the fourth Fire Lab at Missoula Experiment (FLAME-4). The δ(15)N-NOx produced by burning a variety of biomass types ranged from -7 to +12‰ (vs. air N2). The variation in δ(15)N-NOx is primarily driven by variations in the biomass types burned (i.e. δ(15)N-biomass). In the laboratory experiments, two types of emissions were sampled: stack fires where the emissions were measured within a few seconds of production from the fire and chamber fires where the emissions were held in a room for 1-2 hours and sampled continuously...
October 3, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27690211/self-assembly-and-conformational-changes-of-hydrophobin-classes-at-the-air-water-interface
#10
Konrad Meister, Alexander Bäumer, Geza R Szilvay, Arja Paananen, Huib J Bakker
We use surface-specific vibrational sum-frequency generation spectroscopy (VSFG) to study the structure and self-assembling mechanism of the class I hydrophobin SC3 from Schizophyllum commune and the class II hydrophobin HFBI from Trichoderma reesei. We find that both hydrophobins readily accumulate at the water-air interface and form rigid, highly ordered protein films that give rise to prominent VSFG signals. We identify several resonances that are associated with β-sheet structures and assign them to the central β-barrel core present in both proteins...
October 3, 2016: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/27684742/production-of-materials-with-spatially-controlled-cross-link-density-via-vat-photopolymerization
#11
Gregory I Peterson, Johanna J Schwartz, Di Zhang, Benjamin M Weiss, Mark A Ganter, Duane W Storti, Andrew J Boydston
We describe an efficient method to produce objects comprising spatially controlled and graded cross-link densities using vat photopolymerization additive manufacturing (AM). Using a commercially available diacrylate-based photoresin, 3D printer, and digital light processing (DLP) projector, we projected grayscale images to print objects in which the varied light intensity was correlated to controlled cross-link densities and associated mechanical properties. Cylinder and bar test specimens were used to establish correlations between light intensities used for printing and cross-link density in the resulting specimens...
October 11, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27682902/modeling-and-qualification-of-a-modified-emission-unit-for-radioactive-air-emissions-stack-sampling-compliance
#12
J Matthew Barnett, Xiao-Ying Yu, Kurtis P Recknagle, John A Glissmeyer
A planned laboratory space and exhaust system modification to the Pacific Northwest National Laboratory Material Science and Technology Building indicated that a new evaluation of the mixing at the air sampling system location would be required for compliance to ANSI/HPS N13.1-2011. The modified exhaust system would add a third fan, thereby increasing the overall exhaust rate out the stack, thus voiding the previous mixing study. Prior to modifying the radioactive air emissions exhaust system, a three-dimensional computational fluid dynamics computer model was used to evaluate the mixing at the sampling system location...
November 2016: Health Physics
https://www.readbyqxmd.com/read/27649964/lipids-rich-in-%C3%AF-3-polyunsaturated-fatty-acids-from-microalgae
#13
REVIEW
N F Santos-Sánchez, R Valadez-Blanco, B Hernández-Carlos, A Torres-Ariño, P C Guadarrama-Mendoza, R Salas-Coronado
Despite microalgae recently receiving enormous attention as a potential source of biodiesel, their use is still not feasible as an alternative to fossil fuels. Recently, interest in microalgae has focused on the production of bioactive compounds such as polyunsaturated fatty acids (PUFA), which provide microalgae a high added value. Several considerations need to be assessed for optimizing PUFA production from microalgae. Firstly, a microalgae species that produces high PUFA concentrations should be selected, such as Nannochloropsis gaditana, Isochrysis galbana, Phaeodactylum tricornutum, and Crypthecodinium cohnii, with marine species gaining more attention than do freshwater species...
October 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27637279/polychlorinated-naphthalene-pcn-emissions-from-scrap-processing-steel-plants-with-electric-arc-furnaces
#14
Mustafa Odabasi, Yetkin Dumanoglu, Melik Kara, Hasan Altiok, Tolga Elbir, Abdurrahman Bayram
Polychlorinated naphthalene (PCN) emissions of scrap iron processing steel plants were explored by measuring concentrations in stack gases of five plants, in the atmosphere (n=11) at a site close to those plants, and in soil at several sites in the region (n=40) in Aliaga, Izmir, Turkey. Observed stack-gas Σ32PCN levels from the plants without scrap preheating (189±157ngNm(-3), average±SD, n=4) showed that they are substantial PCN emitting sources. Stack-gas Σ32PCN level for the plant with scrap preheating was considerably higher (1262ngNm(-3))...
September 13, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27630091/active-lung-volume-recruitment-to-preserve-vital-capacity-in-duchenne-muscular-dystrophy
#15
Michael Chiou, John R Bach, Lavina Jethani, Michael F Gallagher
OBJECTIVE: To consider the effect of active lung volume recruitment ("air stacking") on rate of decline in vital capacity. DESIGN: Retrospective cross-sectional design. PATIENTS: People with Duchenne muscular dystrophy. METHODS: Vital capacity was measured at every patient visit and then graphed. Air stacking using volume-preset ventilation or manual resuscitator bag was introduced to all patients after their vital capacity plateaued (reached a lifetime maximum)...
September 16, 2016: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27583783/water-floating-giant-nanosheets-from-helical-peptide-pentamers
#16
Jaehun Lee, Ik Rang Choe, Nak-Kyoon Kim, Won-Je Kim, Hyung-Seok Jang, Yoon-Sik Lee, Ki Tae Nam
One of the important challenges in the development of protein-mimetic materials is understanding the sequence-specific assembly behavior and dynamic folding change. Conventional strategies for constructing two-dimensional (2D) nanostructures from peptides have been limited to using β-sheet forming sequences as building blocks due to their natural tendency to form sheet-like aggregations. We have identified a peptide sequence (YFCFY) that can form dimers via a disulfide bridge, fold into a helix, and assemble into macroscopic flat sheets at the air/water interface...
September 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/27580066/molecular-functionalization-of-graphene-oxide-for-next-generation-wearable-electronics
#17
Hadis Zarrin, Serubbabel Sy, Jing Fu, Gaopeng Jiang, Keunwoo Kang, Yun-Seok Jun, Aiping Yu, Michael Fowler, Zhongwei Chen
Acquiring reliable and efficient wearable electronics requires the development of flexible electrolyte membranes (EMs) for energy storage systems with high performance and minimum dependency on the operating conditions. Herein, a freestanding graphene oxide (GO) EM is functionalized with 1-hexyl-3-methylimidazolium chloride (HMIM) molecules via both covalent and noncovalent bonds induced by esterification reactions and electrostatic πcation-π stacking, respectively. Compared to the commercial polymeric membrane, the thin HMIM/GO membrane demonstrates not only slightest performance sensitivity to the operating conditions but also a superior hydroxide conductivity of 0...
September 28, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27513829/8-anilino-1-naphthalenesulfonate-layered-double-hydroxide-ultrathin-films-small-anion-assembly-and-its-potential-application-as-a-fluorescent-biosensor
#18
Ping Zhang, Ling Li, Yun Zhao, Zeyun Tian, Yumei Qin, Jun Lu
The fluorescent dye 8-anilino-1-naphthalenesulfonate (ANS) is a widely used fluorescent probe molecule for biochemistry analysis. This paper reported the fabrication of ANS/layered double hydroxide nanosheets (ANS/LDH)n ultrathin films (UTFs) via the layer-by-layer small anion assembly technique based on electrostatic interaction and two possible weak interactions: hydrogen-bond and induced electrostatic interactions between ANS and positive-charged LDH nanosheets. The obtained UTFs show a long-range-ordered periodic layered stacking structure and weak fluorescence in dry air or water, but it split into three narrow strong peaks in a weak polarity environment induced by the two-dimensional (2D) confinement effect of the LDH laminate; the fluorescence intensity increases with decreasing the solvent polarity, concomitant with the blue shift of the emission peaks, which show good sensoring reversibility...
September 6, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27507303/benefits-of-interventions-for-respiratory-secretion-management-in-adult-palliative-care-patients-a-systematic-review
#19
Juliano Ferreira Arcuri, Ebun Abarshi, Nancy J Preston, Jenny Brine, Valéria Amorim Pires Di Lorenzo
BACKGROUND: Respiratory secretions impact negatively on palliative patients. Unfortunately, a gold standard therapy is not yet available. The purpose of this study was to identify which interventions are in use to control respiratory secretions in patients with chronic disease with a poor prognosis and verify their effects on outcomes relevant for palliative care patients. METHODS: A systematic review of the literature with narrative summary was conducted. We searched eight electronic databases in April (6th), 2016...
2016: BMC Palliative Care
https://www.readbyqxmd.com/read/27443743/absence-of-21st-century-warming-on-antarctic-peninsula-consistent-with-natural-variability
#20
John Turner, Hua Lu, Ian White, John C King, Tony Phillips, J Scott Hosking, Thomas J Bracegirdle, Gareth J Marshall, Robert Mulvaney, Pranab Deb
Since the 1950s, research stations on the Antarctic Peninsula have recorded some of the largest increases in near-surface air temperature in the Southern Hemisphere. This warming has contributed to the regional retreat of glaciers, disintegration of floating ice shelves and a 'greening' through the expansion in range of various flora. Several interlinked processes have been suggested as contributing to the warming, including stratospheric ozone depletion, local sea-ice loss, an increase in westerly winds, and changes in the strength and location of low-high-latitude atmospheric teleconnections...
July 21, 2016: Nature
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