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https://www.readbyqxmd.com/read/28427662/ultrasonic-assisted-synthesis-of-a-tetrazine-functionalized-mof-and-its-application-in-colorimetric-detection-of-phenylhydrazine
#1
Sayed Ali Akbar Razavi, Mohammad Yaser Masoomi, Ali Morsali
TMU-34(-2H), [Zn(OBA)(DPT)0.5].DMF, has been sonochemically synthesized by applying H2OBA, (4,4'-oxybis(benzoic acid)), as the dicarboxylate linker, and DPT, (3,6-di(pyridin-4-yl)-1,2,4,5-tetrazine), as pillar spacer. Sonication time, concentration of initial reagents, sonication power and molar ratio of pyridine as modulator has been optimized to synthesize nano powder of TMU-34(-2H) including uniform plate morphology. Nano TMU-34(-2H), can detect phenylhydrazine (PH) by color changing from pink to deep purple...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28408822/negatively-charged-silver-nanoparticles-with-potent-antibacterial-activity-and-reduced-toxicity-for-pharmaceutical-preparations
#2
Lucia Salvioni, Elisabetta Galbiati, Veronica Collico, Giulia Alessio, Svetlana Avvakumova, Fabio Corsi, Paolo Tortora, Davide Prosperi, Miriam Colombo
BACKGROUND: The discovery of new solutions with antibacterial activity as efficient and safe alternatives to common preservatives (such as parabens) and to combat emerging infections and drug-resistant bacterial pathogens is highly expected in cosmetics and pharmaceutics. Colloidal silver nanoparticles (NPs) are attracting interest as novel effective antimicrobial agents for the prevention of several infectious diseases. METHODS: Water-soluble, negatively charged silver nanoparticles (AgNPs) were synthesized by reduction with citric and tannic acid and characterized by transmission electron microscopy, dynamic light scattering, zeta potential, differential centrifuge sedimentation, and ultraviolet-visible spectroscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28397470/matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-maldi-tof-ms-for-early-identification-of-septic-patients
#3
Ali O Sekercioglu, Yesim Cekin, Dilara Ogunc, Gozde Ongut, Betil O Baysan, Dilek Colak, Filiz Gunseren, Levent Donmez
BACKGROUND: Matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a powerful technique for the rapid identification of bacteria from growing colonies in routine cultures. In this study, we evaluated the feasibility of a 5-hour incubation on solid medium after sub-cultivation of positive blood culture broth without any preparation steps in order to speed up the identification of bacteria. METHODS: In addition to standard laboratory protocols, a Columbia agar plate with 5% sheep blood was inoculated with 1 drop from the blood culture broth...
April 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28394120/h-d-analysis-employing-low-pressure-microjoule-picosecond-laser-induced-breakdown-spectroscopy
#4
Zener Sukra Lie, Marincan Pardede, Eric Jobiliong, Hery Suyanto, Davy Putra Kurniawan, Rinda Hedwig, Muliadi Ramli, Ali Khumaeni, Tjung Jie Lie, Koo Hendrik Kurniawan, Kiichiro Kagawa, May On Tjia
An experimental study is conducted in search of the much needed experimental method for practical and minimally destructive analysis of hydrogen (H) and deuterium (D) in a nuclear power plant. For this purpose, a picosecond (ps) Nd:YAG laser is employed and operated with 300-500 μJ output energies in a variety of ambient gases at various gas pressures. The sample chamber used is specially designed small quartz tube with an open end that can be tightly fitted to the sample surface. It is found that ambient Ar gas at reduced pressure of around 0...
April 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28383245/exploring-the-chemistry-of-genetic-information-storage-and-propagation-through-polymerase-engineering
#5
Gillian Houlihan, Sebastian Arangundy-Franklin, Philipp Holliger
Nucleic acids are a distinct form of sequence-defined biopolymer. What sets them apart from other biopolymers such as polypeptides or polysaccharides is their unique capacity to encode, store, and propagate genetic information (molecular heredity). In nature, just two closely related nucleic acids, DNA and RNA, function as repositories and carriers of genetic information. They therefore are the molecular embodiment of biological information. This naturally leads to questions regarding the degree of variation from this seemingly ideal "Goldilocks" chemistry that would still be compatible with the fundamental property of molecular heredity...
April 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28383180/two-tier-screening-platform-for-directed-evolution-of-aminoacyl-trna-synthetases-with-enhanced-stop-codon-suppression-efficiency
#6
Andrew E Owens, Katherine T Grasso, Christine A Ziegler, Rudi Fasan
Genetic code expansion via amber stop suppression provides a powerful tool for introducing non-proteinogenic functionalities into proteins for a broad range of applications. Here, we report the implementation of a versatile platform for the development of engineered aminoacyl-tRNA synthetases with enhanced efficiency in mediating ncAA incorporation via amber stop codon suppression. This system integrates a white/blue colony screen with a plate-based colorimetric assay, thereby combining high-throughput capabilities with reliable and quantitative measurement of AARS-dependent ncAA incorporation efficiency...
April 6, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28381981/synchrotron-bragg-diffraction-imaging-characterization-of-synthetic-diamond-crystals-for-optical-and-electronic-power-device-applications
#7
Thu Nhi Tran Thi, J Morse, D Caliste, B Fernandez, D Eon, J Härtwig, C Barbay, C Mer-Calfati, N Tranchant, J C Arnault, T A Lafford, J Baruchel
Bragg diffraction imaging enables the quality of synthetic single-crystal diamond substrates and their overgrown, mostly doped, diamond layers to be characterized. This is very important for improving diamond-based devices produced for X-ray optics and power electronics applications. The usual first step for this characterization is white-beam X-ray diffraction topography, which is a simple and fast method to identify the extended defects (dislocations, growth sectors, boundaries, stacking faults, overall curvature etc...
April 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28381062/laguerre-gauss-beam-generation-in-ir-and-uv-by-subwavelength-surface-relief-gratings
#8
Larissa Vertchenko, Evgeniy Shkondin, Radu Malureanu, Carlos Monken
The angular momentum of light can be described by the states of spin angular momentum, associated with polarization, and orbital angular momentum, related to the helical structure of the wave front. Laguerre-Gaussian beams carry orbital angular momentum and their generation can be done by using an optical device known as q-plate. However, due to the usage of liquid crystals, these components may be restricted to operate in specific wavelengths and low power sources. Here we present the fabrication and characterization of q-plates made without liquid crystals, using processes of electron beam lithography, atomic layer deposition and dry etch techniques...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28381005/efficiency-of-multi-beam-fourier-phase-gratings-at-1-4-thz
#9
B Mirzaei, J R G Silva, Y C Luo, X X Liu, L Wei, D J Hayton, J R Gao, C Groppi
We compare the results of simulated and measured power efficiency and far-field beam pattern, for two reflective Fourier phase gratings, designed to generate 2 × 2 and 2 × 4 beams respectively from a single-beam, coherent source at 1.4 THz. The designed surface structures were manufactured on aluminum plates by a computer numerical control (CNC) micro-milling machine. Despite small differences between the designed and fabricated gratings, we measured power efficiencies of both gratings to be around 70%, which is in a good agreement with the simulated values...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28372094/vibration-damping-using-a-spiral-acoustic-black-hole
#10
Jae Yeon Lee, Wonju Jeon
This study starts with a simple question: can the vibration of plates or beams be efficiently reduced using a lightweight structure that occupies a small space? As an efficient technique to damp vibration, the concept of an acoustic black hole (ABH) is adopted with a simple modification of the geometry. The original shape of an ABH is a straight wedge-type profile with power-law thickness, with the reduction of vibration in beams or plates increasing as the length of the ABH increases. However, in real-world applications, there exists an upper bound of the length of an ABH due to space limitations...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28372088/exactness-of-alternative-force-estimation-methods-and-applications-to-power-flow-and-transfer-path-analysis
#11
Akira Inoue
The alternative indirect methods to estimate interfacial force and moment are first given as theoretically exact methods which are derived from the equation of motion. How to directly acquire the F/Q (dynamic stiffness)-type frequency response functions and the blocked boundaries to apply are described in detail. As applications of interfacial force and moment, dissipated power exactly estimated by the total power or energy flows into a system and exactness of the transfer path analysis for structure-borne sound are described...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28371468/tremorolytic-effect-of-5-chloro-5-deoxy-%C3%A2-enba-a-potent-and-selective-adenosine-a1-receptor-agonist-evaluated-in-the-harmaline-induced-model-in-rats
#12
Barbara Kosmowska, Krystyna Ossowska, Urszula Głowacka, Jadwiga Wardas
AIM: The aim of this study was to examine the role of adenosine A1 receptors in the harmaline-induced tremor in rats using 5'-chloro-5'-deoxy-(±)-ENBA (5'Cl5'd-(±)-ENBA), a brain-penetrant, potent, and selective adenosine A1 receptor agonist. METHODS: Harmaline was injected at a dose of 15 mg/kg ip and tremor was measured automatically in force-plate actimeters by an increased averaged power in the frequency band of 9-15 Hz (AP2) and by tremor index (a difference in power between AP2 and averaged power in the frequency band of 0-8 Hz)...
May 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28368478/stabilization-of-tumor-associated-craniovertebral-junction-instability-indications-operative-variables-and-outcomes
#13
Scott L Zuckerman, Fabiana Kreines, Ann Powers, J Bryan Iorgulescu, James B Elder, Mark H Bilsky, Ilya Laufer
BACKGROUND: Whether primary or metastatic, tumors of the craniovertebral junction (CVJ) are rare and challenging. OBJECTIVE: To examine the surgical indications, operative variables, and outcomes in patients with tumors of the CVJ undergoing occipitocervical (OC) stabilization. METHODS: A single-institution, retrospective case series was performed from a prospectively maintained spine database. Patients with primary or metastatic tumors of the CVJ who underwent OC stabilization were identified...
March 28, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28365409/new-caffeic-acid-derivative-from-tithonia-diversifolia-hemsl-a-gray-butanolic-extract-and-its-antioxidant-activity
#14
Kriss Dayana Pantoja Pulido, Ana Julia Colmenares Dulcey, José Hipólito Isaza Martínez
Tithonia diversifolia, Asteraceae, a promising alternative for insect control such as leaf-cutting ants, have revealed repellent and insecticidal activity against Atta cephalotes. The different biological activities of T. diversifolia, are due to the existence of sesquiterpene lactones and phenolic compounds. Some phenolic compounds have antioxidant activity and curiously also exhibited tyrosinase inhibitory activity, key enzyme in insect metamorphosis. To expand the plant phytochemical knowledge, especially for isolation and identification of secondary metabolites such as phenolic compounds not yet discovered in the polar extracts, a new caffeic acid derivative was isolated from the leaves of Tithonia diversifolia...
March 29, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28355967/joint-power-generation-differentiates-young-and-adult-sprinters-during-the-transition-from-block-start-into-acceleration-a-cross-sectional-study
#15
Sofie Debaere, Benedicte Vanwanseele, Christophe Delecluse, Dirk Aerenhouts, Friso Hagman, Ilse Jonkers
The aim of this study was to investigate differences in joint power generation between well-trained adult athletes and young sprinters from block clearance to initial contact of second stance. Eleven under 16 (U16) and 18 under 18 (U18) promising sprinters executed an explosive start action. Fourteen well-trained adult sprinters completed the exact same protocol. All athletes were equipped with 74 spherical reflective markers, while an opto-electronic motion analysis system consisting of 12 infrared cameras (250 Hz, MX3, Vicon, Oxford Metrics, UK) and 2 Kistler force plates (1,000 Hz) was used to collect the three-dimensional marker trajectories and ground reaction forces (Nexus, Vicon)...
March 29, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28355964/study-of-image-qualities-from-6d-robot-based-cbct-imaging-system-of-small-animal-irradiator
#16
Sunil Sharma, Ganesh Narayanasamy, Richard Clarkson, Ming Chao, Eduardo G Moros, Xin Zhang, Yulong Yan, Marjan Boerma, Nava Paudel, Steven Morrill, Peter Corry, Robert J Griffin
PURPOSE: To assess the quality of cone beam computed tomography images obtained by a robotic arm-based and image-guided small animal conformal radiation therapy device. METHOD AND MATERIALS: The small animal conformal radiation therapy device is equipped with a 40 to 225 kV X-ray tube mounted on a custom made gantry, a 1024 × 1024 pixels flat panel detector (200 μm resolution), a programmable 6 degrees of freedom robot for cone beam computed tomography imaging and conformal delivery of radiation doses...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28347772/bifunctional-opioid-nociceptin-hybrid-kgnop1-effectively-attenuates-pain-related-behaviour-in-a-rat-model-of-neuropathy
#17
Joanna Starnowska, Karel Guillemyn, Wioletta Makuch, Joanna Mika, Steven Ballet, Barbara Przewlocka
A bifunctional peptide containing an opioid and nociceptin receptor-binding pharmacophore, H-Dmt-D-Arg-Aba-β-Ala-Arg-Tyr-Tyr-Arg-Ile-Lys-NH2 (KGNOP1), was tested for its analgesic properties when administered intrathecally in naïve and chronic constriction injury (CCI)-exposed rats with neuropathy-like symptoms. KGNOP1 significantly increased the acute pain threshold, as measured by the tail-flick test, and also increased the threshold of a painful reaction to mechanical and thermal stimuli in CCI-exposed rats...
March 24, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28343133/single-crystal-cr2o3-nanoplates-with-differing-crystalinities-derived-from-trinuclear-complexes-and-embedded-in-a-carbon-matrix-as-an-electrode-material-for-supercapacitors
#18
Jikui Zhu, Yuqian Jiang, Zhiyong Lu, Chenglan Zhao, Li Xie, Lingyun Chen, Jingui Duan
As one kind of important p-type semiconductors, Cr2O3 has been widely used for optical and electronic devices due to its high electrical conductivity and special optoelectronic characteristics, as well as high chemical and thermal stability. In this paper, single-crystalline Cr2O3 nanoplates embedded in carbon matrix were successfully synthesized through direct thermal decomposition of a trinuclear cluster complex of [Cr3O(CH3CO2)6(H2O)3]NO3·CH3COOH ([Cr3O]) in Ar atmosphere. The synergetic effect of the plate-like structure and embedding in carbon matrix contributes to the enhanced electrochemical performance of the Cr2O3-C nanoplates...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28338574/rigid-occipitocervical-instrumented-fusion-for-atlantoaxial-instability-in-an-18-month-old-toddler-with-brachytelephalangic-chondrodysplasia-punctata-a-case-report
#19
Hiroki Oba, Jun Takahashi, Kyoko Takano, Yuji Inaba, Mitsuo Motobayashi, Gen Nishimura, Shugo Kuraishi, Masayuki Shimizu, Shota Ikegami, Toshimasa Futatsugi, Masashi Uehara, Tomoki Kosho, Hiroyuki Kato, Koki Uno
STUDY DESIGN: Case report OBJECTIVE.: We report here on an 18-month-old boy with brachytelephalangic chondrodysplasia punctata (BCDP), whose atlantoaxial instability was successfully managed with occipitocervical instrumented fusion (OCF) using screw and rod instrumentations. SUMMARY OF BACKGROUND DATA: Recently, there have been a number of reports on BCDP with early onset of cervical myelopathy. Surgical OCF is a vital intervention to salvage affected individuals from the life-threatening morbidity...
March 23, 2017: Spine
https://www.readbyqxmd.com/read/28334062/overcoming-confounding-plate-effects-in-differential-expression-analyses-of-single-cell-rna-seq-data
#20
Aaron T L Lun, John C Marioni
An increasing number of studies are using single-cell RNA-sequencing (scRNA-seq) to characterize the gene expression profiles of individual cells. One common analysis applied to scRNA-seq data involves detecting differentially expressed (DE) genes between cells in different biological groups. However, many experiments are designed such that the cells to be compared are processed in separate plates or chips, meaning that the groupings are confounded with systematic plate effects. This confounding aspect is frequently ignored in DE analyses of scRNA-seq data...
February 6, 2017: Biostatistics
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