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https://www.readbyqxmd.com/read/28211471/phosphorene-quantum-dot-saturable-absorbers-for-ultrafast-fiber-lasers
#1
J Du, M Zhang, Z Guo, J Chen, X Zhu, G Hu, P Peng, Z Zheng, H Zhang
We fabricate ultrasmall phosphorene quantum dots (PQDs) with an average size of 2.6 ± 0.9 nm using a liquid exfoliation method involving ultrasound probe sonication followed by bath sonication. By coupling the as-prepared PQDs with microfiber evanescent light field, the PQD-based saturable absorber (SA) device exhibits ultrafast nonlinear saturable absorption property, with an optical modulation depth of 8.1% at the telecommunication band. With the integration of the all-fiber PQD-based SA, a continuous-wave passively mode-locked erbium-doped (Er-doped) laser cavity delivers stable, self-starting pulses with a pulse duration of 0...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210465/plasma-surface-modification-as-a-new-approach-to-protect-urinary-catheter-against-escherichia-coli-biofilm-formation
#2
Leila Taheran, Gholamreza Zarrini, Sirous Khorram, Mohammad Sadegh Zakerhamidi
BACKGROUND AND OBJECTIVES: Biomaterials are widely used in medical devices such as urinary catheters. One of the main problems associated with long term using of the urinary catheters is biofilm formation on their surfaces. Many techniques have been presented to reduce the biofilm formation. One of the most revolutionary techniques allowing such surface fictionalization is plasma surface modification. MATERIALS AND METHODS: In this study, a glow discharge plasma (GDP) effect on Escherichia coli biofilm formation on the surface of urinary catheter in the pressure of 1...
August 2016: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/28210447/the-effect-of-different-insertion-techniques-on-the-depth-of-cure-and-vickers-surface-micro-hardness-of-two-bulk-fill-resin-composite-materials
#3
Lamiaa-Mahmoud Moharam, Ahmed-Zohair El-Hoshy, Karim Abou-Elenein
BACKGROUND: The aim of this study was to evaluate the Vickers surface micro-hardness and the depth of cure of two bulk-fill resin composites and one incremental-fill resin composite. MATERIAL AND METHODS: Two Bulk-fill dental resin composites (X-tra Fil, Voco; Sonic-FillTM 2, Kerr Corporation) and an incremental-fill dental resin composite (Filtek™ Z250 XT, 3M ESPE) were used. Sixty cylindrical specimens of 4 mm thickness were prepared using split Teflon moulds...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28207929/optimisation-of-intestinal-microsomal-preparation-in-the-rat-a-systematic-approach-to-assess-the-influence-of-various-methodologies-on-metabolic-activity-and-scaling-factors
#4
Oliver J D Hatley, Christopher R Jones, Aleksandra Galetin, Amin Rostami-Hodjegan
The metabolic capacity of the intestine and its importance as the initial barrier to systemic exposure can lead to under-estimation of first-pass, and thus overestimation of oral bioavailability. However, the in vitro tools informing estimates of in vivo intestinal metabolism are limited by the complexity of the in vitro matrix preparation and uncertainty with the scaling factors for in vitro to in vivo extrapolation. A number of methods currently exist in the literature for the preparation of intestinal microsomes; however, the impact of key steps in the preparation procedure has not been critically assessed...
February 16, 2017: Biopharmaceutics & Drug Disposition
https://www.readbyqxmd.com/read/28205381/the-clinical-significance-of-equivocal-findings-on-spinal-mri-in-children-with-medulloblastoma
#5
Julie Bennett, Ramy Ashmawy, Vijay Ramaswamy, Derek Stephens, Eric Bouffet, Normand Laperriere, Michael Taylor, Manohar Shroff, Ute Bartels
BACKGROUND: Medulloblastoma (MB) is the most common malignant brain tumor of childhood, with cerebrospinal fluid spread the most common site of metastasis. Currently, children diagnosed with MB and evidence of spinal metastasis are treated with an increased dose of craniospinal radiation (CSI). This report reviewed equivocal abnormalities including nerve root clumping, linear vascular enhancement, nerve root enhancement and/or other vague findings on spinal magnetic resonance imaging (MRI) to elucidate their prognostic significance and aid in risk stratification...
February 16, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28203008/-effects-of-different-techniques-on-removal-of-vapor-lock-in-the-apical-region-of-curved-canals-a-cone-beam-computed-tomography-study
#6
Z Su, Y H Bai, X M Hou
OBJECTIVE: To compare the effect of four different techniques on removal of vapor lock in the apical region of curved root canals. METHODS: Forty simulated resin root canals with 45° curvature were prepared using WaveOne Primary, then the apical foramen were sealed with soft wax. The teeth were divided randomly into 4 groups thereafter (n=10). Contract solution was injected into the canals using a 30 G side-vented needle and scanned with cone-beam CT (CBCT) to identify the volume of the vapor lock...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28198062/curcumin-suppresses-lung-cancer-stem-cells-via-inhibiting-wnt-%C3%AE-catenin-and-sonic-hedgehog-pathways
#7
Jian-Yun Zhu, Xue Yang, Yue Chen, Ye Jiang, Shi-Jia Wang, Yuan Li, Xiao-Qian Wang, Yu Meng, Ming-Ming Zhu, Xiao Ma, Cong Huang, Rui Wu, Chun-Feng Xie, Xiao-Ting Li, Shan-Shan Geng, Jie-Shu Wu, Cai-Yun Zhong, Hong-Yu Han
Cancer stem cells (CSCs) are highly implicated in the progression of human cancers. Thus, targeting CSCs may be a promising strategy for cancer therapy. Wnt/β-catenin and Sonic Hedgehog pathways play an important regulatory role in maintaining CSC characteristics. Natural compounds, such as curcumin, possess chemopreventive properties. However, the interventional effect of curcumin on lung CSCs has not been clarified. In the present study, tumorsphere formation assay was used to enrich lung CSCs from A549 and H1299 cells...
February 15, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28195290/microbubbles-trigger-oscillation-of-crystal-size-in-solids
#8
Anna Kollath, Nadzeya Brezhneva, Ekaterina V Skorb, Daria V Andreeva
An understanding of the nature and conditions of nonlinear processes in open systems is important for modulation of the microstructure of solids at a new level of complexity. We demonstrate that cavitation generated by high intensity ultrasound (HIUS) triggers nonlinear processes in microparticles and layers of titanium. We reveal a non-monotonic dependence of the size of grains in the treated solids on sonication time, and oscillation of titanium grain sizes vs. time of ultrasonic treatment, indicating the influence of two opposing forces: cavitation driven impact of shock heating and shear stress on surfaces...
February 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28194730/preparation-and-in-vitro-in-vivo-characterization-of-trans-resveratrol-nanocrystals-for-oral-administration
#9
Sandeep K Singh, Vishal Makadia, Shweta Sharma, Mamunur Rashid, Sudhir Shahi, Prabhat R Mishra, Mohammed Wahajuddin, Jiaur R Gayen
Trans -resveratrol (t-RES) is a natural polyphenolic compound with extensive therapeutic activities; however, its clinical application is circumscribed due to its poor solubility and low bioavailability. The purpose of this study was to prepare stable t-RES nanocrystals (t-RES-NCs) with different stabilizers to improve its oral bioavailability. t-RES-NCs were fabricated by the probe sonication method and optimized by particles size, poly dispersive index and zeta potential. The pharmaceutical characterization of t-RES-NCs was further performed systematically...
February 13, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28194643/ultra-efficient-amplification-of-abnormal-prion-protein-by-modified-protein-misfolding-cyclic-amplification-with-electric-current
#10
Jeong-Ho Park, Yeong-Gon Choi, Seok-Joo Park, Hong-Seok Choi, Eun-Kyoung Choi, Yong-Sun Kim
Prion diseases are clinically diagnosed and confirmed upon post-mortem histopathological examination of brain tissue. The only reliable molecular marker for prion diseases is abnormal prion protein (PrPSc), a pathologically conformed prion protein that primarily accumulates in the central nervous system and to a lesser extent in lymphoreticular tissues. However, the use of PrPSc as a marker for preclinical diagnoses is limited because the concentration of PrPSc in easily accessible body fluids is extremely low...
February 13, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28194541/undermining-plastic-surgery-as-a%C3%A2-possible-option-for-treating-basal-cell-carcinoma-of-the-forehead
#11
Georgi Tchernev, Ivan Pidakev, Ilia Lozev, Torello Lotti, Jose Carlos Cardoso, James W Patterson
Basal cell carcinoma (BCC) is the most common cutaneous cancer. Although most cases can be cured with simple surgical procedures and are associated with a good prognosis, a minority of BCCs may pose significant therapeutic challenges. This occurs mostly in cases of so-called advanced BCC, which a loosely defined term that encompasses locally advanced lesions and tumors with metastatic spread. Treatment of these cases is often complex and sometimes may need combinations of therapeutic modalities, including surgery, radiotherapy and/or targeted therapy directed towards sonic hedgehog (SHH) signaling pathways, such as vismodegib...
February 13, 2017: Wiener Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28193357/efficient-and-clean-pre-concentration-of-ultra-trace-calcium-channel-blockers-from-biological-matrices-via-a-hyphenated-procedure-of-two-sequential-dispersive-solid-liquid-phase-microextractions
#12
Maryam Hemmati, Maryam Rajabi, Alireza Asghari
In the present work, we propose a safe, simple, and relatively rapid procedure for the efficient clean-up and pre-concentration of ultra-trace calcium channel blockers (CCBs) from the human plasma and urine samples followed by high performance liquid chromatography-ultraviolet detection. The proposed sample preparation method is a combination of two microextraction methods termed as ultrasound-assisted dispersive micro solid-phase extraction coupled with air-agitated liquid-liquid microextraction based on solidification of a floating organic droplet (UA-dμSPE-AA-LLME-SFO)...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28192166/detailed-expression-profile-of-the-six-glypicans-and-their-modifying-enzyme-notum-during-chick-limb-and-feather-development
#13
Kawakeb Saad, Susanne Theis, Anthony Otto, Graham Luke, Ketan Patel
The development of vertebrate appendages, especially the limb and feather buds are orchestrated by numerous secreted signalling molecules including Sonic Hedgehog, Bone Morphogenetic Proteins, Fibroblast Growth Factors and Wnts. These proteins coordinate the growth and patterning of ectodermal and mesenchymal cells. The influence of signalling molecules is affected over large distances by their concentration (morphogen activity) but also at local levels by the presence of proteins that either attenuate or promote their activity...
February 10, 2017: Gene
https://www.readbyqxmd.com/read/28191745/comparison-of-sampling-methods-to-recover-germinated-bacillus-anthracis-and-bacillus-thuringiensis-endospores-from-surface-coupons
#14
Tiffany M Mott, Jennifer L Shoe, Melissa Hunter, Amber M Woodson, Kristen A Fritts, Christopher P Klimko, Avery V Quirk, Susan L Welkos, Christopher K Cote
AIMS: In an attempt to devise decontamination methods that are both effective and minimally detrimental to the environment, we evaluated germination-induction as an enhancement to strategies for Bacillus anthracis spore decontamination. To determine an optimal method for the recovery of germinating spores from different matrices it was critical to ensure that the sampling procedures did not negatively impact the viability of the germinating spores possibly confounding the results and downstream analyses of field trial data...
February 12, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28190356/hydroperoxide-measurements-during-low-temperature-gas-phase-oxidation-of-n-heptane-and-n-decane
#15
Anne Rodriguez, Olivier Herbinet, Xiangzan Meng, Christa Fittschen, Zhandong Wang, Lili Xing, Lidong Zhang, Frédérique Battin-Leclerc
A wide range of hydroperoxides (C1-C3 alkyl hydroperoxides, C3-C7 alkenyl hydroperoxides, C7 ketohydroperoxides and hydrogen peroxide (H2O2)), as well as ketene and diones, have been quantified during the gas-phase oxidation of n-heptane. Some of these species, as well as C10 alkenyl hydroperoxides and ketohydroperoxides, were also measured during the oxidation of n-decane. These experiments were was performed using an atmospheric jet-stirred reactor at temperatures from 500 to 1100 K and one of three analytical methods: time-of-flight mass spectrometry combined with tunable synchrotron photoionization with a molecular beam sampling: time-of-flight mass spectrometry combined with laser photoionization with a capillary tube sampling, continuous wave cavity ring-down spectroscopy (cw-CRDS) with sonic probe sampling...
February 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28188758/a-role-for-the-hedgehog-effector-gli1-in-mediating-stent-induced-ureteral-smooth-muscle-dysfunction-and-aperistalsis
#16
Claudia Janssen, Ralph Buttyan, Chun Y Seow, Wolfgang Jäger, Dennis Solomon, Ladan Fazli, Ben H Chew, Dirk Lange
OBJECTIVES: To better understand the effects of Double J (JJ) stenting on ureteral physiology and function. MATERIALS AND METHODS: In total, twenty-four pigs (24) were stented cystoscopically unilaterally for 48h, 1, 2, 4 and 7 wks. Controls consisted of un-stented animals (n=4) or the contralateral un-stented ureter in pigs. Ureters were harvested and tested in tissue baths to evaluate their contractility. Ureteral inflammation and expression of Sonic Hedgehog (Shh) and the transcriptional activator Gli1 (the downstream target of active HH signaling) were assessed histologically and by immunohistochemistry, respectively...
February 8, 2017: Urology
https://www.readbyqxmd.com/read/28185928/biologically-active-and-biomimetic-dual-gelatin-scaffolds-for-tissue-engineering
#17
P Sánchez, J L Pedraz, G Orive
We have designed, developed and optimized Genipin cross-linked 3D gelatin scaffolds that were biologically active and biomimetic, show a dual activity both for growth factor and cell delivery. Type B gelatin powder was dissolved in DI water. 100mg of genipin was dissolved in 10ml of DI water. Three genipin concentrations were prepared: 0.1%, 0.2% and 0.3% (w/v). Solutions were mixed at 40°C and under stirring and then left crosslinking for 72h. Scaffolds were obtained by punching 8 mm-cylinders into ethanol 70% solution for 10min and then freeze-drying...
February 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28185621/a-new-perspective-of-hollow-fiber-mediated-extraction-bundled-hollow-fiber-array-liquid-phase-microextraction-with-sonication-assisted-desorption-and-liquid-chromatography-tandem-mass-spectrometry-for-determination-of-estrogens-in-aqueous-matrices
#18
Shalene Xue Lin Goh, Hian Kee Lee
A bundled hollow fiber array (BHF)-liquid-phase microextraction (LPME) approach has been developed for the ultra-high performance liquid chromatography tandem mass spectrometric determination of estrone, 17β-estradiol, estriol, and 17α-ethinylestradiol. The BHF was dipped in n-octanol to impregnate only the wall pores of the hollow fibers without deliberate loading of extractant solvent in the lumens, before placing it in the sample for extraction. Parameters influencing extraction efficiency, such as number of bundled hollow fibers, type of extraction and desorption solvent, agitation mode, extraction temperature and duration, and the salting out effect were examined...
January 31, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28185220/polycyclic-aromatic-hydrocarbons-pahs-in-surface-sediments-near-a-mining-site-in-okobo-enjema-nigeria-concentrations-source-apportionment-and-risk-assessment
#19
Kenechukwu E Ugwu, Pius O Ukoha
PAHs are pollutants of serious environmental and human health concerns. PAH studies in environmental compartments may assist in designing PAH control measures. The levels of selected PAHs in surface sediment samples of a stream near a mining site at Okobo-Enjema, Nigeria, were investigated. The data were used to determine the possible sources of the PAHs and to assess the potential health risk of the PAHs to humans which was evaluated based on the sediment quality, contamination level and cancer risk guidelines...
February 9, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28185091/canal-cleanliness-using-different-irrigation-activation-systems-a-sem-evaluation
#20
K Urban, D Donnermeyer, Edgar Schäfer, S Bürklein
OBJECTIVES: The purpose of this study was to assess the efficacy of different final irrigation activation methods in removing debris and smear layer in the apical, middle, and coronal portion of straight root canals. MATERIAL AND METHODS: Straight root canals of 58 freshly extracted mandibular premolars were used. Root canals were prepared to size 40.06. Irrigation was performed using 3% sodium hypochlorite. Samples were divided into four equal groups (n = 12) according to the irrigation activation techniques: (A) manual irrigation (MI), (B) EndoActivator (EA) (Dentsply Maillefer, Ballaigues, Switzerland), (C) sonic activation EDDY (EDDY; VDW, Munich, Germany), and (D) passive ultrasonic irrigation (PUI)...
February 9, 2017: Clinical Oral Investigations
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