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https://www.readbyqxmd.com/read/28821098/physical-chemical-characteristics-and-potential-use-of-a-novel-alginate-zein-hydrogel-as-the-sorption-phase-for-polar-organic-compounds
#1
Natara D B Castilhos, Naiara M F M Sampaio, Bruno C da Silva, Izabel C Riegel-Vidotti, Marco T Grassi, Bruno J G Silva
A novel alginate based hydrogel was successfully prepared and tested for the solid phase microextraction of medium-to-high polarity compounds, when supported in a polypropylene (PP) fiber. Pure alginate when added onto the surface of the PP fiber, resulted in a significant improvement in the extraction efficiency of the analytes (except for β-estradiol). The alginate hydrogel was modified upon the incorporation of a small amount of zein, a corn protein. Interestingly, the alginate/zein-supported hydrogel was capable of successfully extracting compounds with low partition constant (Kow), such as 17-α-ethinyl estradiol, progesterone and estriol, since the initial water uptake decreased dramatically in this gel, therefore, leaving the alginate hydroxyl groups more available to interact with the polar compounds...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820983/a-sensitive-method-for-the-separation-and-quantification-of-low-level-adenine-nucleotides-using-porous-graphitic-carbon-based-liquid-chromatography-and-tandem-mass-spectrometry
#2
Sonia Bustamante, Robert B Gilchrist, Dulama Richani
A liquid chromatography coupled to heated electrospray ionization/tandem mass spectrometry (LC-HESI-MS/MS) method was developed for the simultaneous quantitative analysis of low nanomolar level adenine nucleotides AMP, ADP, ATP, cyclic AMP (cAMP), and the nucleoside adenosine. For analyte retention and separation, reverse phase chromatography using porous graphitic carbon (PGC) was employed as it provided full resolution. The erratic chromatographic behaviour characteristic of PGC, including deterioration of analyte resolution and increased peak tailing (leading to decreased sensitivity), was mitigated by incorporating acidic equilibration within runs using a quaternary gradient...
July 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28820742/spatial-valley-separation-in-strained-graphene-pn-junction
#3
HongYu Tian, Jun Wang
Valleytronics in analogy to spintronics aims to use the electron valley degree of freedom to carry and manipulate information, and one of urgent tasks in this field is to generate valley-polarized electrons. In this work, we propose using the electron focusing effect in a strained graphene pn junction to separate valleys spatially through a beam of valley-unpolarized electrons, since the strain-induced pseudo-gauge potentials are opposite for K and [Formula: see text] valleys and severely affect the trajectories of K and [Formula: see text] electron propagation...
August 18, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28820636/clinical-effects-of-cpg-based-treatment-on-the-efficacy-of-hepatocellular-carcinoma-by-skewing-polarization-toward-m1-macrophage-from-m2
#4
Qing Zhang, Ru-Fei Yuan, Xiao-Huan Li, Tai-An Xu, Yan-Ni Zhang, Xiao-Lin Yuan, Yi-Fen Cui, Wan Shen, Qing-Lin Guan, Xiu-Yan Sun
OBJECTIVE: This study aims to explore the clinical efficacy of CpG-based therapy for treating hepatocellular carcinoma (HCC) by skewing polarization toward M1 macrophage from M2. METHODS: Pulmonary metastasis rate, overall survival time, and remission rate of 10 patients with HCC treated with transcatheter arterial chemoembolization (TACE) combined with CpG therapy and 10 age-, gender-, and TNM0-matched patients treated with TACE (control group) were compared. RESULTS: No pulmonary metastasis rate was 70% in the combined treatment group and 40% in the control group, respectively; and the differences between the two groups were statistically significant (p < 0...
August 2017: Cancer Biotherapy & Radiopharmaceuticals
https://www.readbyqxmd.com/read/28820602/intricate-resonant-raman-response-in-anisotropic-res2
#5
Amber McCreary, Jeffrey R Simpson, Yuanxi Wang, Daniel Rhodes, Kazunori Fujisawa, Luis Balicas, Madan Dubey, Vincent H Crespi, Mauricio Terrones, Angela R Hight Walker
The strong in-plane anisotropy of rhenium disulfide (ReS2) offers an additional physical parameter that can be tuned for advanced applications such as logic circuits, thin-film polarizers, and polarization-sensitive photodetectors. ReS2 also presents advantages for optoelectronics, as it is both a direct-gap semiconductor for few-layer thicknesses (unlike MoS2 or WS2) and stable in air (unlike black phosphorus). Raman spectroscopy is one of the most powerful characterization techniques to non-destructively and sensitively probe the fundamental photo-physics of a 2D material...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28820601/negatively-charged-and-dark-excitons-in-cspbbr3-perovskite-nanocrystals-revealed-by-high-magnetic-fields
#6
Damien Canneson, Elena V Shornikova, Dmitri R Yakovlev, Tobias Rogge, Anatolie A Mitioglu, Mariana V Ballottin, Peter C M Christianen, Emmanuel Lhuillier, Manfred Bayer, Louis Biadala
The optical properties of colloidal cesium lead halide perovskite (CsPbBr3) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated by recombination of negatively charged excitons with radiative decay time of 300 ps. The additional long-lived emission with a decay time of 10-30 ns, which decay time shortens and relative amplitude increases in high magnetic fields, evidence the presence of a dark exciton...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28820599/optical-gating-of-black-phosphorus-for-thz-detection
#7
Martin Mittendorff, Ryan J Suess, Edward Leong, Thomas E Murphy
Photoconductive antennas are widely used for time-resolved detection of THz pulses. In contrast to photothermoelectric or bolometric THz detection, the coherent detection allows direct measurement of the electric field transient of a THz pulse, which contains both, spectral and phase information. In this letter we demonstrate for the first time photoconductive detection of free-space propagating THz radiation with thin flakes of a van der Waals material. Mechanically exfoliated flakes of black phosphorus are combined with an antenna that concentrates the THz fields to the small flake (~10 μm)...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28820477/lora-mobile-to-base-station-channel-characterization-in-the-antarctic
#8
Johnny Gaelens, Patrick Van Torre, Jo Verhaevert, Hendrik Rogier
Antarctic conditions demand that wireless sensor nodes are operational all year round and that they provide a large communication range of several tens of kilometers. LoRa technology operating in sub-GHz frequency bands implements these wireless links with minimal power consumption. The employed chirp spread spectrum modulation provides a large link budget, combined with the excellent radio-wave propagation characteristics in these bands. In this paper, an experimental wireless link from a mobile vehicle which transmits sensor data to a base station is measured and analyzed in terms of signal-to-noise ratio and packet loss...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820465/vertical-strip-fed-broadband-circularly-polarized-dielectric-resonator-antenna
#9
Amir Altaf, Jin-Woo Jung, Youngoo Yang, Kang-Yoon Lee, Keum Cheol Hwang
A vertical-strip-fed dielectric resonator antenna exhibiting broadband circular polarization characteristics is presented. A broad 3 dB axial ratio bandwidth (ARBW) is achieved by combining multiple orthogonal modes due to the use of a special-shaped dielectric resonator. The proposed antenna is fabricated to evaluate its actual performance capabilities. The antenna exhibits a measured 3 dB ARBW of 44.2% (3.35-5.25 GHz), lying within a -10 dB reflection bandwidth of 82.7% (2.44-5.88 GHz). The measured peak gain within 3 dB ARBW is found to be 5...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820461/thermal-response-analysis-of-phospholipid-bilayers-using-ellipsometric-techniques
#10
Carmen M González-Henríquez, Vanessa A Villegas-Opazo, Dallits H Sagredo-Oyarce, Mauricio A Sarabia-Vallejos, Claudio A Terraza
Biomimetic planar artificial membranes have been widely studied due to their multiple applications in several research fields. Their humectation and thermal response are crucial for reaching stability; these characteristics are related to the molecular organization inside the bilayer, which is affected by the aliphatic chain length, saturations, and molecule polarity, among others. Bilayer stability becomes a fundamental factor when technological devices are developed-like biosensors-based on those systems...
August 18, 2017: Biosensors
https://www.readbyqxmd.com/read/28820424/observation-of-self-polarization-in-the-bsa-protected-au20-clusters
#11
Deepak Kumar Swain, Alongbar Narzary, Anil Singh, Amreesh Chandra, T Nagasawa, S Yamamoto, Masaya Mitsuishi, S Rath
The bovine serum albumin (BSA) protected gold clusters (atomicity ~ 20), prepared using a wet chemical route, show a strong dipolar radiative transition with gap energy of 1.93 eV due to the high oscillator strength as confirmed from the emission studies. Self-arrangement of the clusters having fixed atomicity yields a low dispersive dielectric and electric self-polarization nature. The electrical hysteresis loop measurements returned a remanent polarization as 0.05 µC/cm2 which can be correlated with dipolar orientation (activation energy ~ 45...
August 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28820248/modulating-wettability-of-layered-materials-by-controlling-ligand-polar-headgroup-dynamics
#12
Terry A Villarreal, Shane R Russell, Jae Jin Bang, Justin K Patterson, Shelley A Claridge
Integrating functionalized 2D materials into multilayer device architectures increasingly requires understanding the behavior of noncovalently adsorbed ligands during solution processing. Here, we demonstrate that the headgroup dynamics of polymerized monolayers of functional alkanes can be controlled to modify surface wetting and environmental interactions. We find that headgroup dynamics are sensitive to the position of the polymerizable diyne group; thus, the polymerization process, typically used to stabilize the noncovalent monolayer, can also be used to selectively destabilize chain-chain interactions near the headgroups, making the headgroups more solvent-accessible and increasing surface hydrophilicity...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820191/comparative-photophysics-and-ultrafast-dynamics-of-dimethylaminochalcone-and-a-structurally-rigid-derivative-experimental-identification-of-tict-coordinate
#13
Rajib Ghosh, Biswajit Manna
Photophysical parameters and ultrafast dynamics of dimethylaminochalone (DMAC-A) have been compared with a structurally bridged analogue (namely, c-DMAC) in solvents of varying polarities. Conformational locking of the single bond connecting the donor and acceptor groups in c-DMAC arrests the twisted intramolecular charge transfer (TICT) relaxation and consequently the photophysical parameters such as fluorescence yield, fluorescence lifetime and triplet yield change significantly. The intramolecular charge transfer character of the LE state is found to be unaffected by conformational restriction...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28820127/mongoliimonas-terrestris-gen-nov-sp-nov-isolated-from-desert-soil
#14
Jiao Xi, Yu Wang, Xiaorong Yang, Yu Tao, Yufang Shao, Fuying Feng
A Gram-stain-negative, non-motile, aerobic, non-spore-forming, spherical bacterium (strain MIMtkB18T) was isolated from desert soil collected from part of a Mongolian Plateau, territory of Inner Mongolia, PR China. Cell growth could be observed at 20-45 °C (optimum at 40 °C), at a pH of 6-9 (optimum at pH 8.6) and in the presence of 0-1 % (w/v) NaCl (optimum 0 %). The genomic DNA G+C content was 69.6 mol%. 16S rRNA gene sequence analysis showed that strain MIMtkB18T was most closely related to Methylobrevis pamukkalensis PK2T (94...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820126/adhaeribacter-terrae-sp-nov-a-novel-bacterium-isolated-from-soil
#15
Nabil Elderiny, Jae-Jin Lee, Yeon-Hee Lee, Su-Jin Park, Seung-Yeol Lee, Sangkyu Park, Young-Je Cho, Leonid N Ten, Hee-Young Jung
Strain HY02T was isolated from a soil sample collected at Namyangju-si, Gyeonggi-do, Republic of Korea. Cells of this strain were observed to be Gram-stain-negative, short and rod-shaped. Colonies were red in colour. A 16S rRNA gene sequence analysis identified this strain as a member of the genus Adhaeribacter in the family Cytophagaceae, with the highest level of 16S rRNA gene sequence similarity to Adhaeribacter terreus DNG6T (98.08 %). This strain was positive for oxidase but negative for catalase activity and acid production from glucose...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820124/bacillus-wudalianchiensis-sp-nov-isolated-from-grass-soils-of-the-wudalianchi-scenic-area
#16
Bo Liu, Guo-Hong Liu, Cetin Sengonca, Peter Schumann, Jie-Ping Wang, Yu-Jing Zhu, Hai-Feng Zhang
A Gram-stain-positive, rod-shaped, endospore-forming, aerobic bacterium, designated FJAT-27215T, was isolated from grass soil collected from Wudalianchi in the Heilongjiang Province of China. Growth was observed at 10-60 °C (optimum 30 °C), in 0 and 3.0 % NaCl (optimum 0 %) and at pH 5.0-10.0 (optimum 7.0), respectively. The cell-wall peptidoglycan contained meso-diaminopimelic acid and the isoprenoid quinone was MK7. The main fatty acids were iso-C15 : 0, anteiso-C15 : 0, anteiso-C17 : 0, and iso-C16 : 0...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820121/aureimonas-endophytica-sp-nov-a-novel-endophytic-bacterium-isolated-from-aegiceras-corniculatum
#17
Fei-Na Li, Li Tuo, Zhen Pan, Min Guo, Simon Ming-Yuen Lee, Li Chen, Lin Hu, Cheng-Hang Sun
A Gram-negative, motile, aerobic and coccoid rod-shaped bacterium, designated strain 2T4P-2-4T, was isolated from a piece of surface-sterilized bark of Aegiceras corniculatum collected from Cotai Ecological Zones in Macao, China, and tested by a polyphasic approach to clarify its taxonomic position. Strain 2T4P-2-4T grew optimally without NaCl at 28-30 °C, pH 7.0-8.0. The 16S rRNA gene sequence of strain 2T4P-2-4T had the highest similarity (96.2 %) to Aureimonas rubiginis CC-CFT034T. Phylogenetic analysis showed that the strain grouped with species of the genus Aureimonas...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820119/blastomonas-fulva-sp-nov-aerobic-photosynthetic-bacteria-isolated-from-a-microcystis-culture
#18
Hyung-Gwan Lee, So-Ra Ko, Jun-Woo Lee, Chang Soo Lee, Chi-Yong Ahn, Hee-Mock Oh, Long Jin
Two Gram-stain-negative, aerobic, non-motile, non-spore-forming and rod-shaped bacteria, designated strains T2T and T5, were isolated from a culture of Microcystis from Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies placed the new isolates in the class Alphaproteobacteria and, notably, most closely related to Blastomonasaquatica PE 4-5T, Blastomonas natatoria DSM 3183T and Blastomonas ursincola KR-99T showing 99.4 %, 98.2 % and 97.9 % 16S rRNA gene sequence similarities, respectively...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820118/arcobacter-haliotis-sp-nov-isolated-from-abalone-species-haliotis-gigantea
#19
Reiji Tanaka, Ilse Cleenwerck, Yukino Mizutani, Shunpei Iehata, Peter Bossier, Peter Vandamme
A Gram-negative, aerobic, polar-flagellated and rod-shaped, sometimes slightly curved bacterium, designated MA5T, was isolated from the gut of an abalone of the species Haliotis gigantea collected in Japan. Phylogenetic analyses based on 16S rRNA, gyrB, hsp60 and rpoB gene sequences placed strain MA5T in the genus Arcobacter in an independent phylogenetic line. Comparison of the 16S rRNA gene sequence of this strain with those of the type strains of the established Arcobacter species revealed A. nitrofigilis (95...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28820117/mucilaginibacter-rubeus-sp-nov-isolated-from-rhizosphere-soil
#20
Jie-Chao Wei, Le-Ni Sun, Zhuo-Xin Yuan, Xue-Ting Hou, En-Dong Yang, Yuan-Yuan Cao
A Gram-stain-negative, aerobic, non-motile, rod-shaped and non-spore-forming bacterium, designated EF23T, was isolated from rhizosphere soil of watermelon. Growth of strain EF23T was observed at 10-37 °C, at pH 5.0-9.0 and in the presence of 0-0.5 % (w/v) NaCl. Strain EF23T contained menaquinone 7 (MK-7) as the major isoprenoid quinone, and summed feature 3 (C16:1ω7c and/or iso-C15 : 0 2-OH), iso-C15 : 0, C16 : 0 and iso-C17 : 0 3-OH as the major fatty acids. Phosphatidylethanolamine was identified as the major polar lipid...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
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