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https://www.readbyqxmd.com/read/29349714/dbda-as-a-novel-matrix-for-the-analyses-of-small-molecules-and-quantification-of-fatty-acids-by-negative-ion-maldi-tof-ms
#1
Ling Ling, Ying Li, Sheng Wang, Liming Guo, Chunsheng Xiao, Xuesi Chen, Xinhua Guo
Matrix interference ions in low mass range has always been a concern when using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) to analyze small molecules (<500 Da). In this work, a novel matrix, N1,N4-dibenzylidenebenzene-1,4-diamine (DBDA) was synthesized for the analyses of small molecules by negative ion MALDI-TOF MS. Notably, only neat ions ([M-H]-) of fatty acids without matrix interference appeared in the mass spectra and the limit of detection (LOD) reached 0...
January 18, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29346651/bipartite-network-analysis-of-gene-sharings-in-the-microbial-world
#2
Eduardo Corel, Raphaël Méheust, Andrew K Watson, James O McInerney, Philippe Lopez, Eric Bapteste
Extensive microbial gene flows affect how we understand virology, microbiology, medical sciences, genetic modification and evolutionary biology. Phylogenies only provide a narrow view of these gene flows: plasmids and viruses, lacking core genes, cannot be attached to cellular life on phylogenetic trees. Yet viruses and plasmids have a major impact on cellular evolution, affecting both the gene content and the dynamics of microbial communities. Using bipartite graphs that connect up to 149,000 clusters of homologous genes with 8217 related and unrelated genomes, we can in particular show patterns of gene sharing that do not map neatly with the organismal phylogeny...
January 15, 2018: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/29346285/characterization-of-odors-of-wood-by-gas-chromatography-olfactometry-with-removal-of-extractives-as-attempt-to-control-indoor-air-quality
#3
Ru Liu, Chen Wang, Anmin Huang, Bin Lv
Indoor air quality problems are usually revealed by occupants' complaints. In this study, the odors of two types of hardwood species, namely, Cathy poplar (Populus cathayana Rehd.) and rubberwood (Hevea brasiliensis) were selected and extracted with ethanol-toluene for removal of extractives in an attempt to eliminate the odors. The odorous components of neat and extracted woods were identified by gas chromatography-mass spectrometry/olfactometry (GC-MS/O). The results showed that about 33 kinds of key volatile compounds (peak area above 0...
January 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29338208/hierarchical-composite-membranes-with-robust-omniphobic-surface-using-layer-by-layer-assembly-technique
#4
Yun Chul Woo, Youngjin Kim, Minwei Yao, Leonard Demegilio Tijing, Juneseok Choi, Sangho Lee, Seunghyun Kim, Hokyong Shon
In this study, composite membranes were fabricated via layer-by-layer (LBL) assembly of negatively-charged silica aerogel (SiA) and 1H, 1H, 2H, 2H - Perfluorodecyltriethoxysilane (FTCS) on a polyvinylidene fluoride phase inversion membrane, and interconnecting them with positively-charged poly(diallyldimethylammonium chloride) (PDDA) via electrostatic interaction. The results showed that the PDDA-SiA-FTCS coated membrane had significantly enhanced the membrane structure and properties. New trifluoromethyl and tetrafluoroethylene bonds appeared at the surface of the coated membrane, which led to lower surface free energy of the composite membrane...
January 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29335498/stretchable-electrospun-pvdf-hfp-co-zno-nanofibers-as-piezoelectric-nanogenerators
#5
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed
Herein, we investigate the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and PVDF-HFP/Co-ZnO nanofibers, fabricated by electrospinning. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the increase in Co-doped ZnO nanofiller concentration in the PVDF-HFP matrix. The dielectric constants of the neat PVDF-HFP and PVDF-HFP/2 wt.% Co-ZnO nanofibers are derived as 8 and 38 respectively. The flexible nanogenerator manipulated from the polymer nanocomposite (PVDF-HFP/Co-ZnO) exhibits an output voltage as high as 2...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29332697/acid-alteration-of-several-ignitable-liquids-of-potential-use-in-arsons
#6
Carlos Martín-Alberca, Héctor Carrascosa, Itxaso San Román, Luis Bartolomé, Carmen García-Ruiz
Ignitable liquids such as fuels, alcohols and thinners can be used in criminal activities, for instance arsons. Forensic experts require to know their chemical compositions, as well as to understand how different modification effects could impact them, in order to detect, classify and identify them properly in fire debris. The acid alteration/acidification of ignitable liquids is a modification effect that sharply alters the chemical composition, for example, of gasoline and diesel fuel, interfering in the forensic analysis and result interpretation...
January 2018: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/29331777/comparing-the-antifouling-effects-of-activated-carbon-and-tio2-in-ultrafiltration-membrane-development
#7
Qianyu Liu, Shaobin Huang, Yongqing Zhang, Shuaifei Zhao
We use activated carbon (AC) and titanium oxide (TiO2) nanomaterials as the additives to prepare four polyvinylidene fluoride (PVDF) based ultrafiltration membranes by nonsolvent induced phase separation. The surface properties (pore size, porosity, hydrophilicity and roughness) of the membranes are characterized by scanning electron microscopy, water contact angle measurement, and atomic force microscopy. The chemical properties of the membranes are evaluated by Fourier transform infrared spectroscopy with attenuated total reflection and X-ray diffraction...
January 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29330414/partially-oxidized-polyvinyl-alcohol-conduitfor-peripheral-nerve-regeneration
#8
Elena Stocco, Silvia Barbon, Lucia Lora, Francesca Grandi, Leonardo Sartore, Cesare Tiengo, Lucia Petrelli, Daniele Dalzoppo, Pier Paolo Parnigotto, Veronica Macchi, Raffaele De Caro, Andrea Porzionato, Claudio Grandi
Surgical reconstruction of peripheral nerves injuries with wide substance-loss is still a challenge. Many studies focused on the development of artificial nerve conduits made of synthetic or biological materials but the ideal device has not yet been identified. Here, we manufactured a conduit for peripheral nerve regeneration using a novel biodegradable hydrogel we patented that is oxidized polyvinyl alcohol (OxPVA). Thus, its characteristics were compared with neat polyvinyl alcohol (PVA) and silk-fibroin (SF) conduits, through in vitro and in vivo analysis...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29323334/unveiling-the-piezoelectric-nature-of-polar-%C3%AE-phase-p-vdf-trfe-at-quasi-two-dimensional-limit
#9
Jun Qian, Sai Jiang, Qijing Wang, Shushu Zheng, Shuya Guo, Chang Yi, Jianpu Wang, Xinran Wang, Kazuhito Tsukagoshi, Yi Shi, Yun Li
Piezoelectric response of P(VDF-TrFE), which is modulated by the dipole density due to the polarization switching on applying an electric field, allows it act as the fundamental components for electromechanical systems. As proposed since the 1970s, its polar α-phase is supposed to yield an enhanced piezoelectric activity. However, its experimental verification has never been reported, hampered by a substantial challenge for the achievement of a smooth, neat α-phase film. Here, we prepare ultrathin crystalline α-phase P(VDF-TrFE) films on the AlOx/Al-coated SiO2/Si substrates via a solution-based approach at room temperature...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320722/biodegradation-and-ecotoxicological-impact-of-celluose-nanocomposites-in-municipal-solid-waste-composting
#10
Shoboo Salehpour, Mehdi Jonoobi, Masoud Ahmadzadeh, Valentina Siracusa, Fatemeh Rafieian, Kristiina Oksman
Biodegradable nanocomposites were prepared from polyvinyl alcohol (PVA) and cellulose nanofiber (CNF) by using liquid nitrogen, freeze drying and hot press techniques. The effect of CNF content on the biodegradability of the films was investigated by visual observation, scanning electron microscopy (SEM), weight loss, CO2 evolution, differential scanning calorimetry, measuring the amount of mineralized carbon of the specimens buried in municipal solid waste. Ecotoxicity was evaluated by plants growth tests with cress and spinach...
January 7, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29320443/evaluation-of-asphalt-mixture-low-temperature-performance-in-bending-beam-creep-test
#11
Marek Pszczola, Mariusz Jaczewski, Dawid Rys, Piotr Jaskula, Cezary Szydlowski
Low-temperature cracking is one of the most common road pavement distress types in Poland. While bitumen performance can be evaluated in detail using bending beam rheometer (BBR) or dynamic shear rheometer (DSR) tests, none of the normalized test methods gives a comprehensive representation of low-temperature performance of the asphalt mixtures. This article presents the Bending Beam Creep test performed at temperatures from -20 °C to +10 °C in order to evaluate the low-temperature performance of asphalt mixtures...
January 10, 2018: Materials
https://www.readbyqxmd.com/read/29318975/evaluation-of-the-antiproliferative-activity-of-some-nanoparticulate-essential-oils-formulated-in-microemulsion-on-selected-human-carcinoma-cell-lines
#12
Ahmed Abd-Rabou, Amr E Edris
BACKGROUND: Essential oils (EOs) are natural volatile plant extract that have different biological activities including antiproliferative potentials. OBJECTIVE: the current study aims at evaluating the antiproliferative activities of six EOs in their neat state compared to their nanoparticulate form after fabrication in microemulsion against some cancer cell lines. The EOs included marjoram (Origanum majorana), turmeric (Curcuma longa), sweet basil (Ocimum basillicum), clove buds (Syzygium aromaticum), geranium (plargonium graviolenis), and black cumin (Nigella sativa)...
January 10, 2018: Current Clinical Pharmacology
https://www.readbyqxmd.com/read/29314595/fabrication-and-characterization-of-polymer-ceramic-nanocomposites-containing-drug-loaded-modified-halloysite-nanotubes
#13
Maedeh Ghaderi-Ghahfarrokhi, Vahid Haddadi-Asl, Seyed Shahrooz Zargarian
Modified halloysite nanotubes (HNT-NH2 and HNT-COOH) were synthesized by a coupling reaction with 3-amino- propyltriethoxysilane (APTES) and maleic anhydride from hydroxyl groups of neat halloysite nanotubes (HNTs). Successful attachment of functional groups onto HNTs was evaluated by FTIR and TGA. XRD was used to study the crystalline structure of scaffolds and the formation of intercalated structure as a result of improved dispersion and decreased agglomeration of modified nanoparticles. Neat HNT, HNT-NH2 and HNT-COOH were subsequently introduced into Polycaprolactone/Pluronic P123 (PCL/P123) electrospun substrate...
January 3, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29310307/insights-in-the-analytical-performance-of-neat-metal-organic-frameworks-in-the-determination-of-pollutants-of-different-nature-from-waters-using-dispersive-miniaturized-solid-phase-extraction-and-liquid-chromatography
#14
Priscilla Rocío-Bautista, Verónica Pino, Jorge Pasán, Irene López-Hernández, Juan H Ayala, Catalina Ruiz-Pérez, Ana M Afonso
Five metal-organic frameworks (MOFs), specifically HKUST-1, MOF-5(Zn), MIL-53(Al), UiO-64 and MOF-74(Zn) are synthesized, characterized, and utilized in a miniaturized solid-phase extraction method under dispersive mode (D-µSPE) for the determination of six pollutants of different nature, including one polycyclic aromatic hydrocarbon, two hormones, two drugs, and one disinfectant, from environmental waters (tap water and wastewater). A discussion of possible interactions justifying the partitioning of target analytes to the MOFs is included, considering not only the analytes' physicochemical characteristics but also those of MOFs: metal nature, structural environment of MOF pores, pore size and pore aperture widths, among others...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29300432/falls-risk-prediction-for-older-inpatients-in-acute-care-medical-wards-is-there-an-interest-to-combine-an-early-nurse-assessment-and-the-artificial-neural-network-analysis
#15
O Beauchet, F Noublanche, R Simon, H Sekhon, J Chabot, E J Levinoff, A Kabeshova, C P Launay
BACKGROUND: Identification of the risk of falls is important among older inpatients. This study aims to examine performance criteria (i.e.; sensitivity, specificity, positive predictive value, negative predictive value and accuracy) for fall prediction resulting from a nurse assessment and an artificial neural networks (ANNs) analysis in older inpatients hospitalized in acute care medical wards. METHODS: A total of 848 older inpatients (mean age, 83.0±7.2 years; 41...
2018: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/29297494/neuroendocrine-tumors-of-the-prostate
#16
Samson W Fine
Neuroendocrine (NE) differentiation in tumors of the prostate or in the setting of prostate cancer (PCa) is rare. A survey of these lesions is presented, including usual PCa with focal NE marker-positive cells, Paneth cell-like change, prostatic 'carcinoid', high-grade NE carcinoma, as well as other tumors that do not fit neatly into these categories. The most significant clinical and pathologic features, emerging molecular evidence and the importance of differentiating NE tumors involving the prostate from secondary involvement are highlighted...
January 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/29288296/fouling-mitigation-and-cleanability-of-tio2-photocatalyst-modified-pvdf-membranes-during-ultrafiltration-of-model-oily-wastewater-with-different-salt-contents
#17
Ildikó Kovács, Gábor Veréb, Szabolcs Kertész, Cecilia Hodúr, Zsuzsanna László
In the present study, TiO2-coated ultrafiltration membranes were prepared and used for oily water filtration (droplet size < 2 μm). The aim of this work was to investigate the effect of different salt contents on fouling and filtration properties of neat and TiO2-coated membranes during oil-in-water emulsion filtration. The effect of the TiO2 coating on the flux, surface free energy, and retention values was measured and compared with the neat membrane values. The cleanability of the fouled TiO2-coated membranes by UV irradiation was also investigated by measuring flux recovery and contact angles, and the chemical changes during cleaning were characterized by ATR-IR...
December 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29279393/designing-a-retrievable-and-scalable-cell-encapsulation-device-for-potential-treatment-of-type-1-diabetes
#18
Duo An, Alan Chiu, James A Flanders, Wei Song, Dahua Shou, Yen-Chun Lu, Lars G Grunnet, Louise Winkel, Camilla Ingvorsen, Nicolaj Strøyer Christophersen, Johannes Josef Fels, Fredrik Wolfhagen Sand, Yewei Ji, Ling Qi, Yehudah Pardo, Dan Luo, Meredith Silberstein, Jintu Fan, Minglin Ma
Cell encapsulation has been shown to hold promise for effective, long-term treatment of type 1 diabetes (T1D). However, challenges remain for its clinical applications. For example, there is an unmet need for an encapsulation system that is capable of delivering sufficient cell mass while still allowing convenient retrieval or replacement. Here, we report a simple cell encapsulation design that is readily scalable and conveniently retrievable. The key to this design was to engineer a highly wettable, Ca2+-releasing nanoporous polymer thread that promoted uniform in situ cross-linking and strong adhesion of a thin layer of alginate hydrogel around the thread...
December 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29278316/low-threshold-light-amplification-in-bifluorene-single-crystals-role-of-the-trap-states
#19
Paulius Baronas, Gediminas Kreiza, Povilas Adomėnas, Ona Adomėnienė, Karolis Kazlauskas, Jean-Charles Ribierre, Chihaya Adachi, Saulius Jursenas
Organic single crystals (SCs) expressing long-range periodicity and dense molecular packing are an attractive amplifying medium for realization of electrically-driven organic lasers. However, amplified spontaneous emission (ASE) threshold (1-10 kW/cm^2) of SCs is still significantly higher as compared to those of amorphous neat or doped films. The current study addresses this issue by investigating ASE properties of rigid bridging groups-containing bifluorene SCs. Introduction of the rigid bridges in bifluorenes enables considerable reduction of non-radiative decay, which along with enhanced fluorescence quantum yield (72-82%) and short excited state lifetime (1...
December 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29259866/alternating-current-magnetic-susceptibility-of-a-ferronematic
#20
Natália Tomašovičová, Jozef Kováč, Veronika Gdovinová, Nándor Éber, Tibor Tóth-Katona, Jan Jadżyn, Peter Kopčanský
We report on experimental studies focusing on the dynamic ac magnetic susceptibility of a ferronematic. It has been shown recently, that in the isotropic phase of a ferronematic, a weak dc bias magnetic field of a few oersteds increases the ac magnetic susceptibility. This increment vanishes irreversibly if the substance is cooled down to the nematic phase, but can be reinduced by applying the dc bias field again in the isotropic phase [Tomašovičová, N. et al. Soft Matter2016, 12, 5780-5786]. The effect has no analogue in the neat host liquid crystal...
2017: Beilstein Journal of Nanotechnology
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