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https://www.readbyqxmd.com/read/28550716/ex-vivo-measurement-of-scalp-follicular-infundibulum-delivery-of-zinc-pyrithione-and-climbazole-from-an-anti-dandruff-shampoo
#1
Guoqiang Chen, Chengdong Ji, Miao Miao, Kang Yang, Yajun Luo, Michael Hoptroff, Luisa Z Collins, Hans-Gerd Janssen
Efficient delivery of anti-dandruff (AD) actives into the scalp follicular infundibulum as well as onto the scalp surface is critical for the efficacy of AD shampoos. A method involving scalp cyanoacrylate (CA) biopsy sampling, a tailor made cutting device, ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis, scanning electron microscopy (SEM) measurement and Raman imaging has been developed for the measurement of delivery of zinc pyrithione (ZPT) and climbazole (CBZ) from an AD shampoo into the scalp follicular infundibulum...
May 17, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28550340/heat-and-bleach-a-cost-efficient-method-for-extracting-microplastics-from-return-activated-sludge
#2
Surya Sujathan, Ann-Kathrin Kniggendorf, Arun Kumar, Bernhard Roth, Karl-Heinz Rosenwinkel, Regina Nogueira
The extraction of plastic microparticles, so-called microplastics, from sludge is a challenging task due to the complex, highly organic material often interspersed with other benign microparticles. The current procedures for microplastic extraction from sludge are time consuming and require expensive reagents for density separation as well as large volumes of oxidizing agents for organic removal, often resulting in tiny sample sizes and thus a disproportional risk of sample bias. In this work, we present an improved extraction method tested on return activated sludge (RAS)...
May 26, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28550162/rb-family-proteins-enforce-the-homeostasis-of-quiescent-hematopoietic-stem-cells-by-repressing-socs3-expression
#3
Eunsun Kim, Ying Cheng, Elisabeth Bolton-Gillespie, Xiongwei Cai, Connie Ma, Amy Tarangelo, Linh Le, Madhumita Jambhekar, Pichai Raman, Katharina E Hayer, Gerald Wertheim, Nancy A Speck, Wei Tong, Patrick Viatour
Prolonged exit from quiescence by hematopoietic stem cells (HSCs) progressively impairs their homeostasis in the bone marrow through an unidentified mechanism. We show that Rb proteins, which are major enforcers of quiescence, maintain HSC homeostasis by positively regulating thrombopoietin (Tpo)-mediated Jak2 signaling. Rb family protein inactivation triggers the progressive E2f-mediated transactivation of Socs3, a potent inhibitor of Jak2 signaling, in cycling HSCs. Aberrant activation of Socs3 impairs Tpo signaling and leads to impaired HSC homeostasis...
May 26, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#4
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548671/controllable-n-fe2o3-graphene-nanomaterials-by-ald-applied-in-an-aptasensor-with-enhanced-electrochemical-performance-for-thrombin-detection
#5
Hongfen Zhang, Baiyan Zhang, Anjia Chen, Yong Qin
An elegant atomic layer deposition (ALD) method has been employed for the controllable preparation of a uniform Fe2O3-coated graphene nanostructure (Fe2O3@graphene). The Fe2O3 coating thickness of the Fe2O3@graphene nanostructure can be tuned by varying the cycle number of Fe2O3 ALD. The produced Fe2O3@graphene composites are characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry (CV). It is revealed that Fe2O3 is effectively deposited on the surface of graphene...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28548670/oxocomplexes-of-u-vi-with-8-hydroxyquinoline-5-sulfonate-in-solution-structural-studies-and-photophysical-behaviour
#6
M Luísa Ramos, Licínia L G Justino, Rui Barata, Telma Costa, Bernardo A Nogueira, Rui Fausto, Hugh D Burrows
Multinuclear ((1)H and (13)C) NMR, and Raman spectroscopy, combined with DFT calculations, provide detailed information on the complexation between U(vi) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, U(vi) oxoions (uranyl ions) form one dominant complex with 8-HQS in water in the pH range 3-6, a mononuclear 1 : 2 (metal : ligand) complex, with the metal centre (UO2(2+)) coordinated to two 8-HQS ligands, together with one or more water molecules...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28548646/prevalence-and-the-risk-factors-for-visual-impairment-in-age-related-macular-degeneration
#7
S Srinivasan, G Swaminathan, V Kulothungan, R Raman, T Sharma
PurposeTo characterize the type, and the causes of visual impairment (VI) in various stages of early and late age-related macular degeneration (AMD) and the factors associated with visual impairment in subjects with AMDMethods6617 subjects ≥60 years were enumerated; 5495 (83.04%) participated in eye examination. Of which, 4791 subjects had gradable fundus images. AMD was graded per International ARM Epidemiological Study Group. Subjects underwent detailed ophthalmic exam. VI was defined per the WHO classification...
May 26, 2017: Eye
https://www.readbyqxmd.com/read/28548534/erratum-realization-of-the-dicke-model-using-cavity-assisted-raman-transitions-phys-rev-lett-113-020408-2014
#8
Markus P Baden, Kyle J Arnold, Arne L Grimsmo, Scott Parkins, Murray D Barrett
This corrects the article DOI: 10.1103/PhysRevLett.113.020408.
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28547992/spatial-and-temporal-variations-in-characteristic-ratios-of-elemental-carbon-with-carbon-monoxide-and-nitrogen-oxides-across-the-united-states
#9
Aishwarya Raman, Avelino Florentino Arellano
A ratio-based method is used to characterize anthropogenic elemental carbon (ECa) using in-situ measurements and emissions of carbon monoxide (CO) and nitrogen oxides (NOX). We use long-term records of ground-based measurements from United States Environmental Protection Agency Air Quality System (USEPA/AQS) and Interagency Monitoring of Protected Visual Environments to assess the patterns in anthropogenic combustion ratios (ΔECa/ΔCO and ΔECa/ΔNOX) across the US Petroleum Administration for Defense Districts (PADD) regions for the years 2000-2015...
May 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28546892/nanoantenna-assisted-plasmonic-enhancement-of-ir-absorption-of-vibrational-modes-of-organic-molecules
#10
Alexander G Milekhin, Olga Cherkasova, Sergei A Kuznetsov, Ilya A Milekhin, Ekatherina E Rodyakina, Alexander V Latyshev, Sreetama Banerjee, Georgeta Salvan, Dietrich R T Zahn
Nanoantenna-assisted plasmonic enhancement of IR absorption and Raman scattering was employed for studying the vibrational modes in organic molecules. Ultrathin cobalt phthalocyanine films (3 nm) were deposited on Au nanoantenna arrays with specified structural parameters. The deposited organic films reveal the enhancement of both Raman scattering and IR absorption vibrational modes. To extend the possibility of implementing surface-enhanced infrared absorption (SEIRA) for biological applications, the detection and analysis of the steroid hormone cortisol was demonstrated...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546551/an-ultra-high-gain-and-efficient-amplifier-based-on-raman-amplification-in-plasma
#11
G Vieux, S Cipiccia, D W Grant, N Lemos, P Grant, C Ciocarlan, B Ersfeld, M S Hur, P Lepipas, G G Manahan, G Raj, D Reboredo Gil, A Subiel, G H Welsh, S M Wiggins, S R Yoffe, J P Farmer, C Aniculaesei, E Brunetti, X Yang, R Heathcote, G Nersisyan, C L S Lewis, A Pukhov, J M Dias, D A Jaroszynski
Raman amplification arising from the excitation of a density echelon in plasma could lead to amplifiers that significantly exceed current power limits of conventional laser media. Here we show that 1-100 J pump pulses can amplify picojoule seed pulses to nearly joule level. The extremely high gain also leads to significant amplification of backscattered radiation from "noise", arising from stochastic plasma fluctuations that competes with externally injected seed pulses, which are amplified to similar levels at the highest pump energies...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28545958/efficacy-of-postoperative-radiation-treatment-for-bone-metastases-in-the-extremities
#12
Leah Drost, Vithusha Ganesh, Bo Angela Wan, Srinivas Raman, Stephanie Chan, Monique Christakis, May Tsao, Elizabeth Barnes, Michael Ford, Joel Finkelstein, Albert Yee, Angela Turner, Henry Lam, Edward Chow
BACKGROUND AND PURPOSE: Impending or pathological fractures due to bone metastases may require surgical fixation. Postoperative radiation is often recommended to reduce local progression and prevent prosthesis displacement, hence reducing the need for second surgery. The objectives of this study were to investigate the need for second surgery, and to report on rates of re-irradiation, tumor progression and prosthesis displacement following postoperative radiation. MATERIALS AND METHODS: Data were collected from 65 patients who received postoperative radiation to 74 sites in the extremities in a palliative radiation clinic between January 2009 and January 2017...
May 22, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28544970/quantitative-chemical-imaging-with-stimulated-raman-scattering-microscopy
#13
REVIEW
Dan Fu
Chemical imaging plays an increasingly important role in studying heterogeneous biological systems. It combines molecular spectroscopy with high-resolution spatial information to create quantitative images of molecular distributions. Here I summarize recent progress in technical developments and biological applications of a specific chemical imaging technique-stimulated Raman scattering (SRS) microscopy. SRS microscopy allows for a wide range of molecules - both endogenous and exogenous - to be imaged at high spatial and temporal resolution in living cells, tissues, and organisms...
May 22, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/28544901/alkaline-electrochemical-advanced-oxidation-process-for-chromium-oxidation-at-graphitized-multi-walled-carbon-nanotubes
#14
Yudong Xue, Shili Zheng, Zhi Sun, Yi Zhang, Wei Jin
Alkaline electrochemical advanced oxidation processes for chromium oxidation and Cr-contaminated waste disposal were reported in this study. The highly graphitized multi-walled carbon nanotubes g-MWCNTs modified electrode was prepared for the in-situ electrochemical generation of HO2(-). RRDE test results illustrated that g-MWCNTs exhibited much higher two-electron oxygen reduction activity than other nanocarbon materials with peak current density of 1.24 mA cm(-2), %HO2(-) of 77.0% and onset potential of -0...
May 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28544849/co-catalytic-effects-of-cos2-on-activity-of-mos2-catalyst-for-electrochemical-hydrogen-evolution
#15
Ranjith Bose, Zhenyu Jin, Seokhee Shin, Sungjoon Kim, Sun Young Lee, Yo-Sep Min
MoS2 is a promising material to replace Pt catalyst for electrochemical hydrogen evolution reaction (HER). It is well known that the activity of the MoS2 catalyst in the HER is significantly promoted by doping cobalt atoms. Recently, the Co-Mo-S phase, in which cobalt atoms decorate the edge positions of the MoS2 slabs, has been identified as a co-catalytic phase in the Co-doped MoS2 (Co-MoSx) with a low Co content. Here, we report the effect of the incorporation of cobalt atoms on the chemical state of Co-MoSx catalyst which gives rise to the co-catalytic effect...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28544200/sers-and-electrochemically-active-3d-plasmonic-liquid-marble-for-molecular-level-spectroelectrochemical-investigation-of-microliter-reaction
#16
Charlynn Koh, Hiang Kwee Lee, Gia Chuong Phan-Quang, Xuemei Han, Mian Rong Lee, Zhe Yang, Xing Yi Ling
Liquid marbles are emerging microreactors due to their isolated environment and flexibility of materials used. Herein, we demonstrate plasmonic liquid marble (PLM) as the smallest spectroelectrochemical microliter-scale reactor for concurrent spectro- and electrochemical analyses. We exploit PLM's three-dimensional Ag shell as bifunctional surface-enhanced Raman scattering (SERS) platform and working electrode for redox process modulation. The combination of SERS and electrochemistry (EC) capability enable in situ molecular read-out of transient electrochemical species, and elucidation of potential-dependent and multi-step reaction dynamics...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543748/universal-method-for-large-scale-synthesis-of-layered-transition-metal-dichalcogenides
#17
Zdenek Sofer, David Sedmidubsky, Jan Luxa, Daniel Bousa, Stepan Huber, Petr Lazar, Martin Vesely, Martin Pumera
The layered transition metal dichalcogenides currently belong to the most intensively investigated materials. These com-pounds constitute a broad family of materials with characteristic layered structures and covering both semiconductors and metallic materials. The great attention arises from the possibility to exfoliate these materials down to single layers with many unique properties like thickness dependent energy of band gap and the possibility of tuning transport properties by phase transitions. The research in the field of transition metal dichalcogenides is also motivated by their high electrocatalytic activity towards several industrially important reactions like hydrogen evolution reaction as well as many other applications in nano- and optoelectronics...
May 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543094/mechanism-of-graphene-induced-cytotoxicity-role-of-endonucleases
#18
Tariq Fahmi, La Donna Branch, Zeid A Nima, Dae Song Jang, Alena V Savenka, Alexandru S Biris, Alexei G Basnakian
Graphene, a crystalline allotrope or carbon, presents numerous useful properties; however, its toxicity is yet to be determined. One of the most dramatic and irreversible toxic abilities of carbon nanomaterials is the induction of DNA fragmentation produced by endogenous cellular endonucleases. This study demonstrated that pristine graphene exposed to cultured kidney tubular epithelial cells is capable of inducing DNA fragmentation measured by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, which is usually associated with cell death...
May 24, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28542948/the-capability-of-raman-microspectroscopy-to-differentiate-printing-inks
#19
Chelsea E Johnson, Paul Martin, Katherine A Roberts, Tatiana Trejos, Ruthmara Corzo, Jose R Almirall, Alan M Safer
This study applies Raman microspectroscopy to differentiate the chemical components in printing inks of different brands, colors, and type using the 532 nm and 785 nm excitation wavelengths. Spectra were collected from 319 inks (78 inkjet, 76 toner, 79 offset, and 86 intaglio) representing various colors. Comparisons were performed to calculate discrimination capability percentages for each ink type. Overall, Raman microspectroscopy differentiates according to the following hierarchy: intaglio (96%), inkjet (92%), offset (90%), and toner (61%)...
May 24, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28542238/frutexites-like-structures-formed-by-iron-oxidizing-biofilms-in-the-continental-subsurface-%C3%A3-sp%C3%A3-hard-rock-laboratory-sweden
#20
Christine Heim, Nadia-Valérie Quéric, Danny Ionescu, Nadine Schäfer, Joachim Reitner
Stromatolitic iron-rich structures have been reported from many ancient environments and are often described as Frutexites, a cryptic microfossil. Although microbial formation of such structures is likely, a clear relation to a microbial precursor is lacking so far. Here we report recent iron oxidizing biofilms which resemble the ancient Frutexites structures. The living Frutexites-like biofilms were sampled at 160 m depth in the Äspö Hard Rock Laboratory in Sweden. Investigations using microscopy, 454 pyrosequencing, FISH, Raman spectroscopy, biomarker and trace element analysis allowed a detailed view of the structural components of the mineralized biofilm...
2017: PloS One
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