Read by QxMD icon Read


Dai Long Vu, Karolína Ranglová, Jan Hájek, Pavel Hrouzek
Quantification of selenated amino-acids currently relies on methods employing inductively coupled plasma mass spectrometry (ICP-MS). Although very accurate, these methods do not allow the simultaneous determination of standard amino-acids, hampering the comparison of the content of selenated versus non-selenated species such as methionine (Met) and selenomethionine (SeMet). This paper reports two approaches for the simultaneous quantification of Met and SeMet. In the first approach, standard enzymatic hydrolysis employing Protease XIV was applied for the preparation of samples...
March 9, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Meng Tian, Yu Long, Dan Xu, Shuoyun Wei, Zhengping Dong
Nowadays, chemical catalytic methods for the treatment of organic wastes are attracting more and more research attention. In the current research, novel catalysts with palladium nanoparticles (Pd NPs) supported on the hollow mesoporous silica nanotubes (h-mSiO2 ) were synthesized for the catalytic reduction of 4-nitrophenol (4-NP) and hydrodechlorination (HDC) of 4-chlorophenol (4-CP). The key point for the fabrication of the catalysts is that a certain thickness of the silica shell was wrapped on the multiwalled carbon nanotubes (MWNTs) or Pd/MWNTs through biphase stratification approach, and then the samples were calcined to remove the MWNTs...
March 14, 2018: Journal of Colloid and Interface Science
Fatemeh Kiani, Negar Ashari Astani, Reza Rahighi, Ahmad Tayyebi, Meysam Tayebi, Jafar Khezri, Ehsan Hashemi, Ursula Rothlisberger, Abdolreza Simchi
In the present work, the effect of graphene oxide (GO) nanosheets on the antibacterial activity of CuO nanowire arrays under visible light irradiation is shown. A combined thermal oxidation/electrophoretic deposition technique was employed to prepare three-dimensional networks of graphene oxide nanosheets hybridized with vertically aligned CuO nanowires. With the help of standard antibacterial assays and X-ray photoelectron spectroscopy, it is shown that the light-activated antibacterial response of the hybrid material against gram-negative Escherichia coli is significantly improved as the oxide functional groups of the GO nanosheets are reduced...
March 7, 2018: Journal of Colloid and Interface Science
Khushboo Patel, Basant Roondhe, Shweta D Dabhi, Prafulla K Jha
Recently predicted and grown new single element two dimensional (2D) material borophene gathered tremendous research interest due to its structural, electronic and other properties. Using first principles based dispersion corrected density functional calculations, we have studied interaction of two toxic gases phosgene (COCl2 ) and carbon monoxide (CO) with borophene to understand the role of borophene as biosensor and carriers in drug delivery. The sensing behaviour of borophene towards COCl2 and CO has been studied by calculating the binding energy and electronic density of states (DOS)...
March 7, 2018: Journal of Hazardous Materials
Wei Wu, Jin Wang, Peter Ercius, Nicomario Courtney Wright, Danielle Marie Leppert-Simenauer, Robert A Burke, Madan Dubey, Avinash M Dongare, Michael Thompson Pettes
Transition metal dichalcogenides (TMDs) are particularly sensitive to mechanical strain as they are capable of experiencing high atomic displacements without nucleating defects to release excess energy. Promising for photonic applications, it has been shown that as certain phases of layered TMDs MX2 (M=Mo, W; X=S, Se, Te) are scaled to a thickness of one monolayer, the photoluminescence response is dramatically enhanced due to the emergence of a direct electronic band gap, compared with their multi-layer or bulk counterparts which typically exhibit indirect band gaps...
March 20, 2018: Nano Letters
Andrea Knöller, Stefan Kilper, Achim Diem, Marc Widenmeyer, Tomce Runcevski, Robert E Dinnebier, Joachim Bill, Zaklina Burghard
The demand to outperform current technologies pushes scientists to develop novel strategies to enable fabricating materials with exceptional properties. Along this line, lightweight structural materials are of great interest due to their versatile applicability as sensors, catalysts, battery electrodes and acoustic or mechanical dampers. Here we report a strategy to design ultralight (ρ = 3 mg/cm3) and hierarchically structured ceramic scaffolds of macroscopic size. Such scaffolds exhibit mechanical reversibility comparable to that of microscopic metamaterials, leading to a macroscopically remarkable dynamic mechanical performance...
March 20, 2018: Nano Letters
Lei Hu, Feiyu Qin, Andrea Sanson, Liang-Feng Huang, Zhao Pan, Qiang Li, Qiang Sun, Lu Wang, Fangming Guo, Umut Aydemir, Yang Ren, Chengjun Sun, Jinxia Deng, Giuliana Aquilanti, James M Rondinelli, Jun Chen, Xianran Xing
The local symmetry, beyond the averaged crystallographic structure, tends to bring unusual performances. Negative thermal expansion is a peculiar physical property of solids. Here, we report the delicate design of the localized symmetry breaking to achieve the controllable thermal ex-pansion in ScF3 nano-scale frameworks. Intriguingly, an iso-tropic zero thermal expansion is concurrently engineered by localized symmetry breaking, with a remarkably low coefficient of thermal expansion of about +4.0×10-8/K up to 675K...
March 20, 2018: Journal of the American Chemical Society
Konstantinos Daskalakis, Aaro Ilmari Väkeväinen, Jani-Petri Martikainen, Tommi K Hakala, Päivi Törmä
Nanoscale coherent light sources offer potentially ultrafast modulation speeds which could be utilized for novel sensors and optical switches. Plasmonic periodic structures combined with organic gain materials have emerged as promising candidates for such nanolasers. Their plasmonic component provides high intensity and ultrafast nanoscale-confined electric fields, while organic gain materials offer fabrication flexibility and low acquisition cost. Despite reports on lasing in plasmonic arrays, lasing dynamics in these structures has not been experimentally studied yet...
March 20, 2018: Nano Letters
Anaid Rosas-Navarro, Gerald Langer, Patrizia Ziveri
The sinking properties of three strains of Emiliania huxleyi in response to temperature changes were examined. We used a recently proposed approach to calculate sinking velocities from coccosphere architecture, which has the advantage to be applicable not only to culture samples, but also to field samples including fossil material. Our data show that temperature in the sub-optimal range impacts sinking velocity of E. huxleyi. This response is widespread among strains isolated in different locations and moreover comparatively predictable, as indicated by the similar slopes of the linear regressions...
2018: PloS One
Cornelia Wiegand, Andrea Völpel, Andrea Ewald, Markko Remesch, Jan Kuever, Janine Bauer, Stefanie Griesheim, Carolin Hauser, Julian Thielmann, Silke Tonndorf-Martini, Bernd W Sigusch, Jürgen Weisser, Ralf Wyrwa, Peter Elsner, Uta-Christina Hipler, Martin Roth, Carolin Dewald, Claudia Lüdecke-Beyer, Jörg Bossert
Bactericidal materials gained interest in the health care sector as they are capable of preventing material surfaces from microbial colonization and subsequent spread of infections. However, commercialization of antimicrobial materials requires proof of their efficacy, which is usually done using in vitro methods. The ISO 22196 standard (Japanese test method JIS Z 2801) is a method for measuring the antibacterial activity of daily goods. As it was found reliable for testing the biocidal activity of antimicrobially active materials and surface coatings most of the laboratories participating in this study used this protocol...
2018: PloS One
Dawei Cai, Zongjian Liu, Guangqi Kong
BACKGROUND Circular RNAs (circRNAs) have emerged as important regulators in carcinogenesis and metastasis. However, the knowledge of circRNAs in bladder cancer remains limited. This study aimed to investigate the role and mechanism of circRNAs in the development and progression of bladder cancer. MATERIAL AND METHODS Three pairs of bladder carcinomas (including high- and low-grade tumors) and adjacent normal tissues were collected from patients. The total RNAs were extracted from these samples and subjected to Clariom D microarray assays to detect the differentially expressed circRNAs and mRNAs...
March 20, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Marcin Procek, Kinga Kepska, Agnieszka Stolarczyk
The detection and concentration measurements of low concentrations of nitrogen dioxide (NO₂) are important because of its negative effects on human health and its application in many fields of industry and safety systems. In our approach, conducting graft copolymers based on the poly(3-hexylthiophene) (P3HT) conducting polymer and other side-chains, polyethylene glycol (PEG) and dodec-1-en, grafted on a poly(methylhydrosiloxane) backbone, were investigated. The grafts containing PEG (PEGSil) and dodec-1-en (DodecSil) in two variants, namely, fractions with shorter (hexane fraction -H) and longer (chloroform fraction -CH) side-chains of P3HT, were tested as receptor structures in NO₂ gas sensors...
March 20, 2018: Sensors
Shufeng Huang, Zhenping Wan, Shuiping Zou
A novel sintered cutting stainless steel fiber felt with internal channels (SCSSFFC) composed of a stainless-steel fiber skeleton, three-dimensional interconnected porous structure and multiple circular microchannels is developed. SCSSFFC has a jagged and rough surface morphology and possesses a high specific surface area, which is approximately 2.4 times larger than that of the sintered bundle-drawing stainless steel fiber felt with internal channels (SBDSSFFC) and is expected to enhance adhesive strength...
March 20, 2018: Materials
Manuel Luna, Juan J Delgado, M L Almoraima Gil, María J Mosquera
The high pollution levels in our cities are producing a significant increase of dust on buildings. An application of photoactive coatings on building materials can produce buildings with self-cleaning surfaces. In this study, we have developed a simple sol-gel route for producing Au-TiO₂/SiO₂ photocatalysts with application on buildings. The gold nanoparticles (AuNPs) improved the TiO₂ photoactivity under solar radiation because they promoted absorption in the visible range. We varied the content of AuNPs in the sols under study, in order to investigate their effect on self-cleaning properties...
March 20, 2018: Nanomaterials
Ahasan Habib, Venkatachalem Sathish, Sanku Mallik, Bashir Khoda
Three-dimensional (3D) bio-printing is a revolutionary technology to reproduce a 3D functional living tissue scaffold in-vitro through controlled layer-by-layer deposition of biomaterials along with high precision positioning of cells. Due to its bio-compatibility, natural hydrogels are commonly considered as the scaffold material. However, the mechanical integrity of a hydrogel material, especially in 3D scaffold architecture, is an issue. In this research, a novel hybrid hydrogel, that is, sodium alginate with carboxymethyl cellulose (CMC) is developed and systematic quantitative characterization tests are conducted to validate its printability, shape fidelity and cell viability...
March 20, 2018: Materials
Catarina Brazão Farinha, Jorge de Brito, Rosário Veiga, J M Fernández, J R Jiménez, A R Esquinas
The production of waste has increased over the years and, lacking a recycle or recovery solution, it is forwarded to landfill. The incorporation of wastes in cement-based materials is a solution to reduce waste deposition. In this regard, some researchers have been studying the incorporation of wastes with different functions: aggregate, binder and addition. The incorporation of wastes should take advantage of their characteristics. It requires a judicious analysis of their particles. This research involves the analysis of seven industrial wastes: biomass ashes, glass fibre, reinforced polymer dust, sanitary ware, fluid catalytic cracking, acrylic fibre, textile fibre and glass fibre...
March 20, 2018: Materials
Arnaldo Leal-Junior, Anselmo Frizera-Neto, Carlos Marques, Maria José Pontes
This paper presents a system capable of measuring temperature and relative humidity with polymer optical fiber (POF) sensors. The sensors are based on variations of the Young's and shear moduli of the POF with variations in temperature and relative humidity. The system comprises two POFs, each with a predefined torsion stress that resulted in a variation in the fiber refractive index due to the stress-optic effect. Because there is a correlation between stress and material properties, the variation in temperature and humidity causes a variation in the fiber's stress, which leads to variations in the fiber refractive index...
March 20, 2018: Sensors
Lídia Resende Oliveira, Susane B Moscardini, Eduardo F Molina, Eduardo José Nassar, Marc Verelst, Lucas Alonso Rocha
In this work, we have investigated how the concentration of Gd<sup>3+</sup> ions affects the structural and luminescent properties of niobium oxide-based matrices doped with Eu<sup>3+</sup> ions obtained by the adapted non-hydrolytic sol-gel route. The X-ray diffractograms revealed that increasing concentration of Gd<sup>3+</sup> ions favored the onset of the Gd<sub>2</sub>O<sub>3</sub> structure decreasing the GdNbO<sub>4</sub> phase...
March 20, 2018: Nanotechnology
Iwona Żychowska, Dorota Suszek, Magdalena Dryglewska, Dorota Nurzyńska, Helena Donica, Maria Majdan
OBJECTIVE: Introduction: Systemic lupus erythematosus (SLE) is an autoimmune disease leading to chronic inflammation of numerous tissues and organs. The search for clinically useful markers of its activity is ongoing. At present, it is suggested that serum free light chains (FLC) may be useful in assessing SLE activity. The aim of study: To investigate the relationship between serum levels of free light chains (FLC) and the activity of SLE. PATIENTS AND METHODS: Material and methods: Eighty-four SLE patients (75 female; 9 men) aged 34...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Radosław Jeleniewicz, Dorota Suszek, Maria Majdan
OBJECTIVE: Introduction: Musculoskeletal symptoms are not characteristic for granulomatosis with polyangiitis (GPA) patients. However, they could be present in two-thirds of patients at the onset of the disease and may provoke diagnostic difficulties. The aim: To assess retrospectively musculoskeletal manifestations in a group of GPA patients. PATIENTS AND METHODS: Material and methods: The analyzed group consisted of 44 patients with GPA (27M, 17F) aged 46.7 years (16-75) and treated at the Department of Rheumatology and Connective Tissue Diseases in Lublin between 2010-2016...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"