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https://www.readbyqxmd.com/read/28231455/synthetic-investigation-physicochemical-characterization-and-antibacterial-evaluation-of-ternary-bi-iii-systems-with-hydroxycarboxylic-acid-and-aromatic-chelator-substrates
#1
C M Nday, E Halevas, A Tsiaprazi-Stamou, D Eleftheriadou, A Hatzidimitriou, G Jackson, D Reid, A Salifoglou
Due to its physical and chemical properties, bismuth (Bi(III)) is widely used in the treatment of several gastrointestinal and skin diseases, and infections caused by bacteria. Herein, its known antimicrobial potential was taken into consideration in the synthesis of two new hybrid ternary materials of Bi(III) with the physiological α-hydroxycarboxylic glycolic acid and 1,10-phenanthroline (phen), [Bi2(C2H2O3)2(C2H3O3)(NO3)]n(.) nH2O (1) and [Bi(C12H8N2)(NO3)4](C10H8N4) (2), aiming at improving its antibacterial properties...
February 11, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28231034/upscaling-of-hips-cell-derived-neurons-for-high-throughput-screening
#2
Stefanie Traub, Heiko Stahl, Holger Rosenbrock, Eric Simon, Ralf Heilker
The advent of human-induced pluripotent stem (hiPS) cell-derived neurons promised to provide better model cells for drug discovery in the context of the central nervous system. This work demonstrates both the upscaling of cellular expansion and the acceleration of neuronal differentiation to accommodate the immense material needs of a high-throughput screening (HTS) approach. Using GRowth factor-driven expansion and INhibition of NotCH (GRINCH) during maturation, the derived cells are here referred to as GRINCH neurons...
March 2017: SLAS Discov
https://www.readbyqxmd.com/read/28230973/unique-opto-electronic-structure-and-photo-reduction-properties-of-sulfur-doped-lead-chromates-explaining-their-instability-in-paintings
#3
Vanousheh Rahemi, Nasrin Sarmadian, Willemien Anaf, Koen Janssens, Dirk Lamoen, Bart Partoens, Karolien De Wael
Chrome yellow refers to a group of synthetic inorganic pigments that became popular as an artist's material from the second quarter of the 19th century. The color of the pigment, in which the chromate ion acts as a chromophore, is related to its chemical composition (PbCr1-xSxO4, with 0≤x≤0.8) and crystalline structure (monoclinic/orthorhombic). Their shades range from the yellow-orange to the paler yellow tones with increasing sulfate amount. These pigments show remarkable signs of degradation after limited time periods...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28230817/common%C3%A2-chemical%C3%A2-inductors%C3%A2-of%C3%A2-replication%C3%A2-stress-%C3%A2-focus%C3%A2-on%C3%A2-cell-based%C3%A2-studies
#4
REVIEW
Eva Vesela, Katarina Chroma, Zsofia Turi, Martin Mistrik
DNA replication is a highly demanding process regarding the energy and material supply and must be precisely regulated, involving multiple cellular feedbacks. The slowing down or stalling of DNA synthesis and/or replication forks is referred to as replication stress (RS). Owing to the complexity and requirements of replication, a plethora of factors may interfere and challenge the genome stability, cell survival or affect the whole organism. This review outlines chemical compounds that are known inducers of RS and commonly used in laboratory research...
February 21, 2017: Biomolecules
https://www.readbyqxmd.com/read/28230344/fully-automatic-in-syringe-magnetic-stirring-assisted-dispersive-liquid-liquid-microextraction-hyphenated-to-high-temperature-torch-integrated-sample-introduction-system-inductively-coupled-plasma-spectrometer-with-direct-analysis-of-the-organic-phase
#5
Raquel Sanchez, Burkhard Horstkotte, Katerina Fikarova, Hana Sklenářová, Salvador Maestre, Manuel Miró, José Luis Todoli
A proof of concept study involving the on-line coupling of automatic dispersive liquid-liquid microextraction (DLLME) to ICP OES with direct introduction and analysis of the organic extract is herein reported for the first time. The flow-based analyzer features a Lab-In-Syringe (LIS) setup with an integrated stirring system, a Meinhard® nebulizer in combination with a heated single-pass spray chamber, and a rotary injection valve, used as on-line interface between the microextraction system and the detection instrument...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28229462/harmonization-of-nucleic-acid-testing-for-zika-virus-development-of-the-1-st-world-health-organization-international-standard
#6
Sally A Baylis, Kay-Martin O Hanschmann, Barbara S Schnierle, Jan-Hendrik Trösemeier, Johannes Blümel
BACKGROUND: With the ongoing public health emergency due to Zika virus (ZIKV), nucleic acid testing (NAT) is essential for clinical diagnosis and screening of blood donors. However, NAT for ZIKV has not been standardized, and this study was performed to establish a World Health Organization (WHO) International Standard (IS) for ZIKV RNA; WHO ISs have been used to improve detection and quantification of blood-borne viruses. STUDY DESIGN AND METHODS: The candidate IS (cIS), code number 11468/16, was prepared by heat inactivation and lyophilization of a ZIKV strain isolated from a patient in French Polynesia in 2013...
February 23, 2017: Transfusion
https://www.readbyqxmd.com/read/28228684/on-the-identity-and-typification-of-solanum-brasilianum-dunal-solanaceae
#7
Suelma Ribeiro-Silva, Sandra Knapp, Carolyn E B Proença
Solanum brasilianum Dunal was described by Dunal in 1813 with reference only to an illustration in an 18(th) century work by Leonard Plukenet. The plate is difficult to interpret and no explicitly related specimens were available so the name Solanum brasilianum has long been regarded as "unresolved" and has never been used. Material matching the Plukenet plate was discovered in the herbarium of the University of Oxford (OXF) by Stephen Harris during his study of the English privateer William Dampier's Brazilian collection...
2017: PhytoKeys
https://www.readbyqxmd.com/read/28228185/knowledge-of-childhood-materiality-text-and-the-history-of-science-an-interdisciplinary-round-table-discussion
#8
Felix Rietmann, Mareike Schildmann, Caroline Arni, Daniel Thomas Cook, Davide Giuriato, Novina Göhlsdorf, Wangui Muigai
This round table discussion takes the diversity of discourse and practice shaping modern knowledge about childhood as an opportunity to engage with recent historiographical approaches in the history of science. It draws attention to symmetries and references among scientific, material, literary and artistic cultures and their respective forms of knowledge. The five participating scholars come from various fields in the humanities and social sciences and allude to historiographical and methodological questions through a range of examples...
February 23, 2017: British Journal for the History of Science
https://www.readbyqxmd.com/read/28227097/effects-of-geometry-and-material-on-the-insertion-of-very-small-neural-electrode
#9
Shaun P Marshall, Wei-Chen Lin, Paras R Patel, Albert J Shih, Cynthia A Chestek, Shaun P Marshall, Wei-Chen Lin, Paras R Patel, Albert J Shih, Cynthia A Chestek, Wei-Chen Lin, Shaun P Marshall, Cynthia A Chestek, Albert J Shih, Paras R Patel
For neural probes to be used chronically for years in the human body, they must provoke minimal scarring. Recently, a number of groups have reported substantially reduced scar tissue using cellular scale electrodes below 15 μm in size. This size scale is accessible to manufacturing techniques, but can be very difficult to insert in the brain for most common electrode materials. In this study, we explore the design space available to cellular scale electrodes that will self-insert into the brain. First a mathematical model is developed using beam buckling equations for different materials and geometries...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225713/the-development-and-evolution-of-physical-medicine-and-rehabilitation-in-taiwan-from-1958-to-2016
#10
I-Nan Lien, Pei-Shen Wu, Tyng-Guey Wang, Ssu-Yuan Chen, Henry L Lew
The field of physical medicine and rehabilitation (PM&R) began its development in Taiwan since 1958, and has gradually evolved into a profession that provides a diversity of clinical services and educational activities. The objectives of this brief report were to (1) review its background and milestones in the past 6 decades, (2) describe the current role and function of its Academy of PM&R, (3) present the content and format of its board certification process, focusing on (a) residency training requirements, (b) self-assessment examination, board certification process, and (c) maintenance of certification through continued education...
March 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28225235/-multiple-sclerosis-a-mitochondria-mediated-disease
#11
Kristin N Varhaug, Christian A Vedeler, Charalampos Tzoulis, Laurence A Bindoff
BACKGROUND Mitochondria play an important role in the pathogenesis of various neurodegenerative disorders, including Parkinson's disease. Neurodegenerative changes occur early in the course of multiple sclerosis (MS). This article aims to present information on a possible association between mitochondrial dysfunction and multiple sclerosis.MATERIAL AND METHOD The article is based on original and review articles selected following a literature search in PubMed, restricted to articles written in English, and concluded in May 2016...
February 2017: Tidsskrift for Den Norske Lægeforening: Tidsskrift for Praktisk Medicin, Ny Række
https://www.readbyqxmd.com/read/28225022/core-shell-nanoparticle-arrays-double-the-strength-of-steel
#12
J-B Seol, S-H Na, B Gault, J-E Kim, J-C Han, C-G Park, D Raabe
Manipulating structure, defects and composition of a material at the atomic scale for enhancing its physical or mechanical properties is referred to as nanostructuring. Here, by combining advanced microscopy techniques, we unveil how formation of highly regular nano-arrays of nanoparticles doubles the strength of an Fe-based alloy, doped with Ti, Mo, and V, from 500 MPa to 1 GPa, upon prolonged heat treatment. The nanoparticles form at moving heterophase interfaces during cooling from the high-temperature face-centered cubic austenite to the body-centered cubic ferrite phase...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224911/determination-of-total-cyanide-in-soil-by-isotope-dilution-gc-ms-following-pentafluorobenzyl-derivatization
#13
Beatrice Campanella, Lorenzo Biancalana, Lucia D'Ulivo, Massimo Onor, Emilia Bramanti, Zoltan Mester, Enea Pagliano
The high toxicity of cyanide, along with its widespread industrial use, has fuelled interest in the development of analytical methods for its determination in complex matrices. In this study, we propose a novel approach for the measurement of total cyanide in soil samples based on single-step derivatization with pentafluorobenzyl bromide (F5Bn-Br) followed by quantitation with gas chromatography mass spectrometry in negative chemical ionization mode. The reaction between CN(-) and F5Bn-Br resulted in the identification of several derivatives such as F5Bn-CN, (F5Bn)(F5Ph)CH-CN, and (F5Bn)2(F5Ph)C-CN...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224906/a-comparative-study-of-sample-dissolution-techniques-and-plasma-based-instruments-for-the-precise-and-accurate-quantification-of-rees-in-mineral-matrices
#14
Laurence Whitty-Léveillé, Keven Turgeon, Claude Bazin, Dominic Larivière
The recent commercialisation of inductively coupled plasma tandem mass spectrometric (ICP-MS/MS) instruments has provided analytical chemists with a new tool to properly quantify atomic composition in a variety of matrices with minimal sample preparation. In this article, we report on our assessment of the compatibility of 3 sample preparation techniques (open-vessel acid digestion, microwave digestion and alkaline fusion) for the quantification of rare earth elements (REEs) in mineral matrices. The combination of the high digestion temperatures (1050 °C) and using LiBO2 as a flux was the most effective strategy for the digestion of all rare earth elements in mineral matrices and was compatible with ICP-MS/MS measurements...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224783/a-highly-stretchable-potentiometric-ph-sensor-fabricated-via-direct-laser-writing-machining-of-carbon-polyaniline-composite
#15
Rahim Rahimi, Manuel Ochoa, Ali Tamayol, Shahla Khalili, Ali Khademhosseini, Babak Ziaie
Development of stretchable sensors has recently attracted considerable attention. These sensors have been used in wearable and robotics applications such as personalized health-monitoring, motion detection, and human-machine interfaces. Herein, we report on a highly stretchable electrochemical pH sensor for wearable point-of-care applications that consists of a pH sensitive working and a liquid-junction-free reference electrode, in which the stretchable conductive interconnections are fabricated by laser carbonizing and micromachining of a polyimide sheet bonded to an Ecoflex substrate...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28224243/simultaneous-quantitation-of-endogenous-estrone-17%C3%AE-estradiol-and-estriol-in-human-serum-by-isotope-dilution-liquid-chromatography-tandem-mass-spectrometry-for-clinical-laboratory-applications
#16
Qiaoxuan Zhang, Liqiao Han, Jianbing Wang, Haibiao Lin, Peifeng Ke, Junhua Zhuang, Xianzhang Huang
Estrogen measurements are important in the assessment of female reproductive function and have expanding roles in other fields. A simple, accurate, highly sensitive and specific isotope-dilution liquid chromatography-tandem mass spectrometry method was developed and evaluated to simultaneously measure three endogenous estrogens in serum: estrone (E1), 17β-estradiol (E2), and estriol (E3). Chromatographic separation was achieved on a C18 column before electrospray ionization triple-quadrupole mass spectrometry in multiple reaction monitoring mode...
February 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28223751/secondary-cutaneous-amyloidosis-in-a-patient-with-mycosis-fungoides
#17
Chan Hee Nam, Min Kee Park, Mi Soo Choi, Seung Phil Hong, Byung Cheol Park, Myung Hwa Kim
Secondary cutaneous amyloidosis refers to clinically unapparent amyloid deposits within the skin in association with a pre-existing skin condition or skin tumors, such as basal cell carcinoma, porokeratosis, solar elastosis, Bowen's disease, and mycosis fungoides. A 70-year-old woman presented with a 6-month history of asymptomatic multiple yellowish plaques on both legs. She had been diagnosed with mycosis fungoides 7 years ago and was treated with psoralen and ultraviolet A radiation (PUVA) therapy, narrow-band ultraviolet B (UVB) therapy, and acitretin for 5 years...
February 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28222954/measurement-of-norm-samples-with-cebr3-detectors
#18
Virginia Peyres, Teresa Crespo, Marcos Mejuto, Eduardo García-Toraño
This paper discusses the use of CeBr3 detectors for the analysis of NORM samples. These detectors have a number of characteristics that make them suitable to field measurements: they can work at ambient temperatures, have better energy resolution than NaI(Tl) detectors for energies over 100keV and do not present the radioactive contamination typical of the lanthanum halides detectors. Results of the measurements made at the laboratory for three reference materials are compared to those made using a conventional HPGe gamma-ray spectrometer system...
February 14, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28222646/effectiveness-of-contrast-enhanced-ultrasound-and-serum-liver-enzyme-measurement-in-detection-and-classification-of-blunt-liver-trauma
#19
Da-Wei Zhao, Meng Tian, Le-Tian Zhang, Tao Li, Jie Bi, Jia-Ying He, Ying-Ying Zhang
Objective This study was performed to identify the correlation between contrast-enhanced ultrasound (CEUS) and contrast-enhanced multidetector computed tomography (CE-MDCT) as well as the correlation between serum liver enzyme concentrations and CE-MDCT in classification of the severity of blunt hepatic trauma using CE-MDCT as a reference standard. Materials and methods A blunt liver trauma model was created using 20 rabbits, and CE-MDCT, CEUS, and serum liver enzyme assays were performed. A radiologist and an ultrasound physician independently evaluated the degree of liver trauma...
February 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28222013/serum-triglyceride-measurements-the-commutability-of-reference-materials-and-the-accuracy-of-results
#20
Qinghui Meng, Weiyan Zhou, Chuanbao Zhang, Jie Zeng, Haijian Zhao, Tianjiao Zhang, Donghuan Wang, Jiangtao Zhang, Ying Yan, Wenxiang Chen
Background We aimed to evaluate the commutability of external quality assessment (EQA) materials, aqueous solutions, and commercial reference materials (calibrators and controls), and the accuracy of routine systems for serum triglyceride measurements. Methods According to the clinical and laboratory standards institute (CLSI) EP14-A3 protocol, we analyzed 43 fresh patient specimens and 32 processed materials including lyophilized samples, human serum pools, liquid reagents, swine sera and aqueous solutions by 14 routine methods (evaluated methods) and an isotope dilution liquid chromatography tandem mass spectrometry method (ID-LC/MS/MS) (comparative method)...
February 21, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
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