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https://www.readbyqxmd.com/read/29342422/magnetic-mesoporous-molecularly-imprinted-polymers-based-on-surface-precipitation-polymerization-for-selective-enrichment-of-triclosan-and-triclocarban
#1
Xuemei Wang, Pengfei Huang, Xiaomin Ma, Xinzhen Du, Xiaoquan Lu
Novel magnetic mesoporous molecularly imprinted polymers (MMIPs) were prepared based on surface precipitation polymerization using Triclosan (TCS) as template and methacrylic acid as functional monomer. The synthesized MMIPs-TCS were applied to the adsorbent of magnetic solid-phase extraction (MSPE) coupled with HPLC for the enrichment and determination of TCS. The MMIPs-TCS were characterized by fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption transmission, and vibrating sample magnetometry...
January 10, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29342351/organic-mixed-valence-compounds-derived-from-cyclic-alkyl-amino-carbenes
#2
Max M Hansmann, Mohand Melaimi, Guy Bertrand
Readily available room temperature stable organic mixed valence compounds are prepared by one-electron reduction of cyclic bis(iminium) salts [derived from cyclic (alkyl)(amino)carbenes] bridged by various spacers. These compounds show characteristic intervalence charge transfer (IV-CT) bands in the near-infrared (NIR). Cyclic voltammetry, EPR, IR, UV-VIS and X-ray studies, as well as DFT calculations, show that depending on the nature of the spacer, these mixed valence compounds range from class III to borderline class I/II...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29342122/synthesis-and-characterization-of-a-heterometallic-extended-architecture-based-on-a-manganese-ii-substituted-sandwich-type-polyoxotungstate
#3
Masooma Ibrahim, Eufemio Moreno-Pineda, Thomas Bergfeldt, Christopher E Anson, Annie K Powell
The reaction of [α-P₂W15O56]12- with MnII and DyIII in an aqueous basic solution led to the isolation of an all inorganic heterometallic aggregate Na10(OH₂)42[{Dy(H₂O)₆}₂Mn₄P₄W30O112(H₂O)₂]·17H₂O (Dy₂Mn₄-P₂W15). Single-crystal X-ray diffraction revealed that Dy₂Mn₄-P₂W15 crystallizes in the triclinic system with space group P 1 ¯ , and consists of a tetranuclear manganese(II)-substituted sandwich-type phosphotungstate [Mn₄(H₂O)₂(P₂W15O56)₂]16- (Mn₄-P₂W15), Na, and DyIII cations...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29342097/time-domain-near-infrared-spectroscopy-device-for-monitoring-muscle-oxidative-metabolism-custom-probe-and-in-vivo-applications
#4
Rebecca Re, Ileana Pirovano, Davide Contini, Lorenzo Spinelli, Alessandro Torricelli
Measurement of muscle oxidative metabolism is of interest for monitoring the training status in athletes and the rehabilitation process in patients. Time domain near infrared spectroscopy (TD NIRS) is an optical technique that allows the non-invasive measurement of the hemodynamic parameters in muscular tissue: concentrations of oxy- and deoxy-hemoglobin, total hemoglobin content, and tissue oxygen saturation. In this paper, we present a novel TD NIRS medical device for muscle oxidative metabolism. A custom-printed 3D probe, able to host optical elements for signal acquisition from muscle, was develop for TD NIRS in vivo measurements...
January 17, 2018: Sensors
https://www.readbyqxmd.com/read/29341908/induction-of-au-methotrexate-conjugates-by-sugar-molecules-production-assembly-mechanism-and-bioassay-studies
#5
Wei-Yuan Wang, Xiu-Fen Zhao, Xiao-Han Ju, Ping Liu, Jing Li, Ya-Wen Tang, Shu-Ping Li, Xiao-Dong Li, Fu-Gui Song
Au-methotrexate (Au-MTX) conjugates induced by sugar molecules were produced by a simple, one-pot, hydrothermal growth method. Herein, the Au(III)-MTX complexes were used as the precursors to form Au-MTX conjugates. Addition of different types of sugar molecules with abundant hydroxyl groups resulted in the formation of Au-MTX conjugates featuring distinct characteristics that could be explained by the diverse capping mechanisms of sugar molecules. That is, the instant-capping mechanism of glucose favored the generation of peanut-like Au-MTX conjugates with high colloidal stability while the post-capping mechanism of dextran and sucrose resulted in the production of Au-MTX conjugates featuring excellent near-infrared (NIR) optical properties with a long-wavelength plasmon resonance near 630-760 nm...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341849/factors-affecting-occlusion-pressure-and-ischemic-preconditioning
#6
Henry Brown, Martyn J Binnie, Brian Dawson, Nicola Bullock, Brendan R Scott, Peter Peeling
PURPOSE: To determine the effect of limb selection (upper/lower), cuff width (small (6 cm)/medium (13 cm) upper; medium/large (18 cm) lower) and anthropometry on arterial occlusion pressure (AOP) in ischemic preconditioning (IPC). METHODS: Twenty athletes (10 females and 10 males) had surface anthropometry and dual x-ray absorptiometry (DXA) assessments before using Doppler ultrasound to confirm AOP for each limb. Subsequently, 5 min of occlusion occurred, with near-infrared spectroscopy (NIRS) measuring muscle oxygenation changes...
January 17, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29341716/single-electron-and-single-photon-sensitivity-with-a-silicon-skipper-ccd
#7
Javier Tiffenberg, Miguel Sofo-Haro, Alex Drlica-Wagner, Rouven Essig, Yann Guardincerri, Steve Holland, Tomer Volansky, Tien-Tien Yu
We have developed ultralow-noise electronics in combination with repetitive, nondestructive readout of a thick, fully depleted charge-coupled device (CCD) to achieve an unprecedented noise level of 0.068  e^{-} rms/pixel. This is the first time that discrete subelectron readout noise has been achieved reproducible over millions of pixels on a stable, large-area detector. This enables the contemporaneous, discrete, and quantized measurement of charge in pixels, irrespective of whether they contain zero electrons or thousands of electrons...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341710/vibrational-action-spectroscopy-of-solids-new-surface-sensitive-technique
#8
Zongfang Wu, Agata Płucienik, Felix E Feiten, Matthias Naschitzki, Walter Wachsmann, Sandy Gewinner, Wieland Schöllkopf, Volker Staemmler, Helmut Kuhlenbeck, Hans-Joachim Freund
Vibrational action spectroscopy employing infrared radiation from a free-electron laser has been successfully used for many years to study the vibrational and structural properties of gas phase aggregates. Despite the high sensitivity of this method no relevant studies have yet been conducted for solid sample surfaces. We have set up an experiment for the application of this method to such targets, using infrared light from the free-electron laser of the Fritz Haber Institute. In this Letter, we present first results of this technique with adsorbed argon and neon atoms as messengers...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341667/dark-kinetic-heating-of-neutron-stars-and-an-infrared-window-on-wimps-simps-and-pure-higgsinos
#9
Masha Baryakhtar, Joseph Bramante, Shirley Weishi Li, Tim Linden, Nirmal Raj
We identify a largely model-independent signature of dark matter (DM) interactions with nucleons and electrons. DM in the local galactic halo, gravitationally accelerated to over half the speed of light, scatters against and deposits kinetic energy into neutron stars, heating them to infrared blackbody temperatures. The resulting radiation could potentially be detected by the James Webb Space Telescope, the Thirty Meter Telescope, or the European Extremely Large Telescope. This mechanism also produces optical emission from neutron stars in the galactic bulge, and x-ray emission near the galactic center because dark matter is denser in these regions...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341651/lattice-homotopy-constraints-on-phases-of-quantum-magnets
#10
Hoi Chun Po, Haruki Watanabe, Chao-Ming Jian, Michael P Zaletel
The Lieb-Schultz-Mattis (LSM) theorem and its extensions forbid trivial phases from arising in certain quantum magnets. Constraining infrared behavior with the ultraviolet data encoded in the microscopic lattice of spins, these theorems tie the absence of spontaneous symmetry breaking to the emergence of exotic phases like quantum spin liquids. In this work, we take a new topological perspective on these theorems, by arguing they originate from an obstruction to "trivializing" the lattice under smooth, symmetric deformations, which we call the "lattice homotopy problem...
September 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341630/terahertz-sum-frequency-excitation-of-a-raman-active-phonon
#11
Sebastian Maehrlein, Alexander Paarmann, Martin Wolf, Tobias Kampfrath
In stimulated Raman scattering, two incident optical waves induce a force oscillating at the difference of the two light frequencies. This process has enabled important applications such as the excitation and coherent control of phonons and magnons by femtosecond laser pulses. Here, we experimentally and theoretically demonstrate the so far neglected up-conversion counterpart of this process: THz sum-frequency excitation of a Raman-active phonon mode, which is tantamount to two-photon absorption by an optical transition between two adjacent vibrational levels...
September 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341590/correction-to-fourier-transform-infrared-studies-on-the-dissociation-behavior-of-metal-chelating-polyelectrolyte-brushes
#12
Maxine J Roman, Eric A Decker, Julie M Goddard
No abstract text is available yet for this article.
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29341467/optoacoustic-sensing-of-hematocrit-to-improve-the-accuracy-of-hybrid-fluorescence-ultrasound-intravascular-imaging
#13
Dmitry Bozhko, Angelos Karlas, Dimitris Gorpas, Vasilis Ntziachristos
Hybrid intravascular fluorescence-ultrasound imaging is emerging for reading anatomical and biological information in vivo. By operating through blood, intravascular near-infrared fluorescence (NIRF) detection is affected by hemoglobin attenuation. Improved quantification has been demonstrated with methods that correct for the attenuation of the optical signal as it propagates through blood. These methods assume an attenuation coefficient for blood and measure the distance between detector and the vessel wall by observing the intravascular ultrasound (IVUS) images...
January 17, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29341436/a-novel-nir-fluorescent-probe-for-monitoring-cox-2-in-inflammation-and-tumor
#14
Qi Zhang, Zhihao Han, Ji Tao, Wancun Zhang, Ping Li, Liping Tang, Yueqing Gu
Targeting COX-2 for molecular imaging is an attractive approach applicable for its overexpression in inflammation and many malignancies. Herein, for monitoring COX-2, we synthesize a specific COX-2 probe CMP, based on celecoxib and a water-soluble near-infrared dye MPA. Its high affinity for binding to COX-2 is verified by molecular docking, dynamics simulation and inhibition assay. At cellular level, CMP selectively accumulates in cytoplasm of COX-2-positive cells. In vivo assays, probe guided-imaging in inflamed or cancerous tissues confirms that CMP can bind to the locally endogenic COX-2 and exhibit intense fluorescence...
January 17, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29341421/a-stable-room-temperature-luminescent-biphenylmethyl-radical
#15
Xin Ai, Yingxin Chen, Yuting Feng, Feng Li
There is only one family of room-temperature luminescent radicals, the triphenylmethyl radicals, to date. Herein, we synthesize a new stable room-temperature luminescent radical, (N-carbazolyl)bis(2,4,6-tirchlorophenyl)methyl radical (CzBTM), which has improved properties compared to the triphenylmethyl radicals. X-ray crystallography, electron paramagnetic resonance spectroscopy, and magnetic susceptibility measurements confirmed the radical structure. CzBTM shows room-temperature deep-red to near-infrared emission in various solutions...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29341330/real-time-and-high-resolution-bioimaging-with-bright-aggregation-induced-emission-dots-in-short-wave-infrared-region
#16
Ji Qi, Chaowei Sun, Abudureheman Zebibula, Hequn Zhang, Ryan T K Kwok, Xinyuan Zhao, Wang Xi, Jacky W Y Lam, Jun Qian, Ben Zhong Tang
Fluorescence imaging in the spectral region beyond the conventional near-infrared biological window (700-900 nm) can theoretically afford high resolution and deep tissue penetration. Although some efforts have been devoted to developing a short-wave infrared (SWIR; 900-1700 nm) imaging modality in the past decade, long-wavelength biomedical imaging is still suboptimal owing to the unsatisfactory materials properties of SWIR fluorophores. Taking advantage of organic dots based on an aggregation-induced emission luminogen (AIEgen), herein microscopic vasculature imaging of brain and tumor is reported in living mice in the SWIR spectral region...
January 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29341066/cerebral-near-infrared-spectroscopy-nirs-for-perioperative-monitoring-of-brain-oxygenation-in-children-and-adults
#17
REVIEW
Yun Yu, Kaiying Zhang, Ling Zhang, Huantao Zong, Lingzhong Meng, Ruquan Han
BACKGROUND: Various techniques have been employed for the early detection of perioperative cerebral ischaemia and hypoxia. Cerebral near-infrared spectroscopy (NIRS) is increasingly used in this clinical scenario to monitor brain oxygenation. However, it is unknown whether perioperative cerebral NIRS monitoring and the subsequent treatment strategies are of benefit to patients. OBJECTIVES: To assess the effects of perioperative cerebral NIRS monitoring and corresponding treatment strategies in adults and children, compared with blinded or no cerebral oxygenation monitoring, or cerebral oxygenation monitoring based on non-NIRS technologies, on the detection of cerebral oxygen desaturation events (CDEs), neurological outcomes, non-neurological outcomes and socioeconomic impact (including cost of hospitalization and length of hospital stay)...
January 17, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29340867/photoluminescent-and-thermoluminescent-studies-of-dy3-and-eu3-doped-y2o3-phosphors
#18
Tarkeshwari Verma, Sadhana Agrawal
Eu3+ doped and Dy3+ codoped yttrium oxide (Y2O3) phosphors have been prepared using solid-state reaction technique (SSR). The prepared phosphors were characterized by X-ray diffractometer (XRD), energy dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FTIR) techniques. Photoluminescence (PL) and Thermoluminescence (TL) properties were studied in detail. PL emission spectra were recorded for prepared phosphors under excitation wavelength 254 nm, which show a high intense peak at 613 nm for Y2O3:Dy3+, Eu3+ (1:1...
January 16, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29340830/fabrication-of-srge2-thin-films-on-ge-100-110-and-111-substrates
#19
T Imajo, K Toko, R Takabe, N Saitoh, N Yoshizawa, T Suemasu
Semiconductor strontium digermanide (SrGe2) has a large absorption coefficient in the near-infrared light region and is expected to be useful for multijunction solar cells. This study firstly demonstrates the formation of SrGe2 thin films via a reactive deposition epitaxy on Ge substrates. The growth morphology of SrGe2 dramatically changed depending on the growth temperature (300-700 °C) and the crystal orientation of the Ge substrate. We succeeded in obtaining single-oriented SrGe2 using a Ge (110) substrate at 500 °C...
January 16, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29340715/postural-control-and-the-relation-with-cervical-sensorimotor-control-in-patients-with-idiopathic-adult-onset-cervical-dystonia
#20
J De Pauw, R Mercelis, A Hallemans, G Van Gils, S Truijen, P Cras, W De Hertogh
Cervical dystonia (CD) is a movement disorder characterized by involuntary muscle contractions leading to an abnormal head posture or movements of the neck. Dysfunctions in somatosensory integration are present and previous data showed enlarged postural sway in stance. Postural control during quiet sitting and the correlation with cervical sensorimotor control were investigated. Postural control during quiet sitting was measured via body sway parameters in 23 patients with CD, regularly receiving botulinum toxin treatment and compared with 36 healthy controls...
January 16, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
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