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https://www.readbyqxmd.com/read/28548051/xenon-gas-field-ion-source-from-a-single-atom-tip
#1
Wei-Chiao Lai, Chun-Yueh Lin, Wei-Tse Chang, Po-Chang Li, Tsu-Yi Fu, Chia-Seng Chang, T T Tsong, Ing-Shouh Hwang
Focused ion beam (FIB) systems have become powerful diagnostic and modification tools for nanoscience and nanotechnology. Gas field ion sources (GFISs) built from atomic-size emitters offer the highest brightness among all ion sources and thus can improve the spatial resolution of FIB systems. Here we show that the Ir/W(111) single-atom tip (SAT) can emit high-brightness Xe(+) ion beams with a high current stability. The ion emission current versus extraction voltage was analyzed from 150 K up to 309 K. The optimal emitter temperature for maximum Xe(+) ion emission was ∼150 K and the reduced brightness at the Xe gas pressure of 1 × 10(-4) torr is two to three orders of magnitude higher than that of a Ga liquid metal ion source, and four to five orders of magnitude higher than that of a Xe inductively coupled plasma ion source...
May 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28544398/prediction-of-long-term-clinical-outcome-in-a-diverse-chronic-hepatitis-b-population-role-of-the-page-b-score
#2
Willem P Brouwer, Adriaan J van der Meer, Andre Boonstra, Elisabeth P C Plompen, Suzan D Pas, Robert J de Knegt, Rob A de Man, Fiebo J W Ten Kate, Harry L A Janssen, Bettina E Hansen
BACKGROUND & AIMS: An abundance of non-invasive scores have been associated with fibrosis and hepatocellular carcinoma (HCC) development. We aimed to compare the prognostic ability of these scores in relation to liver histology in chronic hepatitis B (CHB) patients. METHODS: Liver biopsies from treatment-naïve CHB patients at one tertiary care centre were scored by a single hepato-pathologist. Laboratory values at liver biopsy were used to calculate the PAGE-B, REACH-B, GAG-HCC, CU-HCC, and FIB-4 scores...
May 24, 2017: Journal of Viral Hepatitis
https://www.readbyqxmd.com/read/28538189/evaluation-of-methods-to-sample-fecal-indicator-bacteria-in-foreshore-sand-and-pore-water-at-freshwater-beaches
#3
Laura J Vogel, Thomas A Edge, Denis M O'Carroll, Helena M Solo-Gabriele, Caitlin S E Kushnir, Clare E Robinson
Fecal indicator bacteria (FIB) are known to accumulate in foreshore beach sand and pore water (referred to as foreshore reservoir) where they act as a non-point source for contaminating adjacent surface waters. While guidelines exist for sampling surface waters at recreational beaches, there is no widely-accepted method to collect sand/sediment or pore water samples for FIB enumeration. The effect of different sampling strategies in quantifying the abundance of FIB in the foreshore reservoir is unclear. Sampling was conducted at six freshwater beaches with different sand types to evaluate sampling methods for characterizing the abundance of E...
May 9, 2017: Water Research
https://www.readbyqxmd.com/read/28524028/-efficacy-of-20-albumin-infusion-on-coagulation-and-pulmonary-fibrosis-in-rabbits-with-ards
#4
Ling Yao, Bo Liu, Feng Shen
OBJECTIVE: To observe the efficacy of 20% albumin infusion on coagulation and pulmonary fibrosis in rabbits with acute respiratory distress syndrome (ARDS) induced by two-hit of intravenous infusion of oleid acid (OA) and lipopolysaccharide (LPS). METHODS: Forty healthy adult male rabbits were randomly divided into five groups, namely sham group, model group, albumin group (20% albumin), saline group (0.9% sodium chloride injection) and Ringer group (lactate Ringer solution), with 8 rabbits in each group...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28504417/laser-preparation-of-geometrically-optimised-samples-for-x-ray-nano-ct
#5
J J Bailey, T M M Heenan, D P Finegan, X Lu, S R Daemi, F Iacoviello, N R Backeberg, O O Taiwo, D J L Brett, A Atkinson, P R Shearing
A robust and versatile sample preparation technique for the fabrication of cylindrical pillars for imaging by X-ray nano-computed tomography (nano-CT) is presented. The procedure employs simple, cost-effective laser micro-machining coupled with focused-ion beam (FIB) milling, when required, to yield mechanically robust samples at the micrometre length-scale to match the field-of-view (FOV) for nano-CT imaging. A variety of energy and geological materials are exhibited as case studies, demonstrating the procedure can be applied to a variety of materials to provide geometrically optimised samples whose size and shape are tailored to the attenuation coefficients of the constituent phases...
May 15, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28487005/nitrogen-gas-field-ion-source-gfis-focused-ion-beam-fib-secondary-electron-imaging-a-first-look
#6
Marek E Schmidt, Anto Yasaka, Masashi Akabori, Hiroshi Mizuta
The recent technological advance of the gas field ion source (GFIS) and its successful integration into systems has renewed the interest in the focused ion beam (FIB) technology. Due to the atomically small source size and the use of light ions, the limitations of the liquid metal ion source are solved as device dimensions are pushed further towards the single-digit nanometer size. Helium and neon ions are the most widely used, but a large portfolio of available ion species is desirable, to allow a wide range of applications...
May 10, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28469811/factors-associated-with-success-of-telaprevir-and-boceprevir-based-triple-therapy-for-hepatitis-c-virus-infection
#7
Kian Bichoupan, Neeta Tandon, Valerie Martel-Laferriere, Neal M Patel, David Sachs, Michel Ng, Emily A Schonfeld, Alexis Pappas, James Crismale, Alicia Stivala, Viktoriya Khaitova, Donald Gardenier, Michael Linderman, William Olson, Ponni V Perumalswami, Thomas D Schiano, Joseph A Odin, Lawrence U Liu, Douglas T Dieterich, Andrea D Branch
AIM: To evaluate new therapies for hepatitis C virus (HCV), data about real-world outcomes are needed. METHODS: Outcomes of 223 patients with genotype 1 HCV who started telaprevir- or boceprevir-based triple therapy (May 2011-March 2012) at the Mount Sinai Medical Center were analyzed. Human immunodeficiency virus-positive patients and patients who received a liver transplant were excluded. Factors associated with sustained virological response (SVR24) and relapse were analyzed by univariable and multivariable logistic regression as well as classification and regression trees...
April 18, 2017: World Journal of Hepatology
https://www.readbyqxmd.com/read/28464883/late-presentation-of-chronic-viral-hepatitis-for-medical-care-a-consensus-definition
#8
Stefan Mauss, Stanislas Pol, Maria Buti, Erika Duffell, Charles Gore, Jeffrey V Lazarus, Hilje Logtenberg-van der Grient, Jens Lundgren, Antons Mozalevskis, Dorthe Raben, Eberhard Schatz, Stefan Wiktor, Jürgen K Rockstroh
INTRODUCTION: We present two consensus definitions of advanced and late stage liver disease being used as epidemiological tools. These definitions can be applied to assess the morbidity caused by liver diseases in different health care systems. We focus is on hepatitis B and C virus infections, because effective and well tolerated treatments for both of these infections have greatly improved our ability to successfully treat and prevent advanced and late stage disease, especially if diagnosed early...
May 3, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28462431/total-staphylococci-as-performance-surrogate-for-greywater-treatment
#9
David C Shoults, Nicholas J Ashbolt
Faecal indicator bacteria (FIB) are commonly used as water quality indicators; implying faecal contamination and therefore the potential presence of pathogenic enteric bacteria, viruses, and protozoa. Hence in wastewater treatment, the most commonly used treatment process measures (surrogates) are total coliforms, faecal coliforms, Escherichia coli (E. coli), and enterococci. However, greywater potentially contains skin pathogens unrelated to faecal load, and E. coli and other FIB may grow within greywater unrelated to pathogens...
May 1, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28462070/ion-beam-profiling-from-the-interaction-with-a-freestanding-2d-layer
#10
Ivan Shorubalko, Kyoungjun Choi, Michael Stiefel, Hyung Gyu Park
Recent years have seen a great potential of the focused ion beam (FIB) technology for the nanometer-scale patterning of a freestanding two-dimensional (2D) layer. Experimentally determined sputtering yields of the perforation process can be quantitatively explained using the binary collision theory. The main peculiarity of the interaction between the ion beams and the suspended 2D material lies in the absence of collision cascades, featured by no interaction volume. Thus, the patterning resolution is directly set by the beam diameters...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28456238/a-direct-differential-method-for-measuring-thermal-conductivity-of-thin-films
#11
Yuqiang Zeng, Amy Marconnet
Over the past two decades, significant progress in the thermal metrology for thin films and wires has enabled new understanding of the thermal conductivity of nanostructures. However, a large variation in the measured thermal conductivity of similar nanostructured samples has been observed. In addition to potential differences from sample-to-sample, measurement uncertainty contributes to the observed variation in measured properties. Many now standard micro/nanoscale thermal measurement techniques require extensive calibration of the properties of the substrate and support structures and this calibration contributes to uncertainty...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28451176/on-the-molecular-mechanisms-for-the-h2-co2-separation-performance-of-zeolite-imidazolate-framework-two-layered-membranes
#12
Fernando Cacho-Bailo, Ismael Matito-Martos, Julio Perez-Carbajo, Miren Etxeberría-Benavides, Oğuz Karvan, Víctor Sebastián, Sofía Calero, Carlos Téllez, Joaquín Coronas
Double-layered zeolitic imidazolate framework (ZIF) membranes were fabricated inside polyimide P84 hollow fibers by a step-synthesis conducted by microfluidic technology and applied to pre-combustion gas separation. Our hypothesis, based on the information provided by a combination of molecular simulation and experiments, is that a CO2 adsorption reduction on the surface of the ZIF-9 would enhance the molecular sieving effect of this ZIF-9 layer and therefore the selectivity in the H2/CO2 mixture separation of the entire membrane...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28444420/periportal-lymphatic-system-on-post-hepatobiliary-phase-gd-eob-dtpa-enhanced-mr-imaging-in-normal-subjects-and-patients-with-chronic-hepatitis-c
#13
Yasunari Yamada, Shunro Matsumoto, Hiromu Mori, Ryo Takaji, Maki Kiyonaga, Naoki Hijiya, Rika Tanoue, Kenichiro Tomonari, Shuichi Tanoue, Norio Hongo, Masayuki Ohta, Masataka Seike, Masafumi Inomata, Kazunari Murakami, Masatsugu Moriyama
PURPOSE: We sought to evaluate visualization of periportal lymphatics and lymph nodes (lymphatic system) on Gd-EOB-DTPA-enhanced magnetic resonance (MR) images using a fat-suppressed T2-weighted sequence with 3-dimensional (3D) volume isotropic turbo spin echo acquisition (VISTA) at 3.0 T in normal subjects and patients with chronic hepatitis C. METHODS: MR imaging was performed in 254 subjects between June 2013 and May 2016. After applying inclusion and exclusion criteria, the final population was 31 normal subjects and 34 patients with chronic hepatitis C...
April 25, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28441599/transport-and-attenuation-of-salmonella-enterica-fecal-indicator-bacteria-and-a-poultry-litter-marker-gene-are-correlated-in-soil-columns
#14
Sirisha Mantha, Angela Anderson, Saraswati Poudel Acharya, Valerie J Harwood, Jennifer Weidhaas
Millions of tons of fecal-contaminated poultry litter are applied to U.S. agricultural fields annually. Precipitation and irrigation facilitate transport of fecal-derived pathogens and fecal indicator bacteria (FIB) to groundwater. The goal of this study was to compare transport of pathogens, FIB, and a microbial source tracking marker gene for poultry litter (LA35) in a simulated soil-to-groundwater system. Nine laboratory soil columns containing four different soil types were used to evaluate microbial transport to groundwater via infiltration...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28433878/effect-of-freshwater-sediment-characteristics-on-the-persistence-of-fecal-indicator-bacteria-and-genetic-markers-within-a-southern-california-watershed
#15
Amity G Zimmer-Faust, Vanessa Thulsiraj, Catalina Marambio-Jones, Yiping Cao, John F Griffith, Patricia A Holden, Jennifer A Jay
In this study, the aging of culturable FIB and DNA representing genetic markers for Enterococcus spp. (ENT1A), general Bacteroides (GB3), and human-associated Bacteroides (HF183) in freshwater sediments was evaluated. Freshwater sediment was collected from four different sites within the upper and lower reach of the Topanga Creek Watershed and two additional comparator sites within the Santa Monica Bay, for a total of six sites. Untreated (ambient) and oven-dried (reduced microbiota) sediment was inoculated with 5% sewage and artificial freshwater...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28425016/a-simple-bedside-blood-test-fibrofast-fib-5-is-superior-to-fib-4-index-for-the-differentiation-between-non-significant-and-significant-fibrosis-in-patients-with-chronic-hepatitis-c
#16
G Shiha, S Seif, A Eldesoky, M Elbasiony, R Soliman, A Metwally, K Zalata, N Mikhail
INTRODUCTION: A simple non-invasive score (Fibrofast, FIB-5) was developed using five routine laboratory tests (ALT, AST, alkaline phosphatase, albumin and platelets count) for the detection of significant hepatic fibrosis in patients with chronic hepatitis C. The FIB-4 index is a non-invasive test for the assessment of liver fibrosis, and a score of ≤1.45 enables the correct identification of patients who have non-significant (F0-1) from significant fibrosis (F2-4), and could avoid liver biopsy...
April 19, 2017: Hepatology International
https://www.readbyqxmd.com/read/28422310/adult-onset-cystic-fibrosis-liver-disease-diagnosis-and-characterization-of-an-underappreciated-entity
#17
Christopher Koh, Sasan Sakiani, Pallavi Surana, Xiongce Zhao, Jason Eccleston, David E Kleiner, David Herion, T Jake Liang, Jay H Hoofnagle, Milica Chernick, Theo Heller
BACKGROUND & AIMS: Cystic fibrosis liver disease (CFLD), a leading cause of death in cystic fibrosis (CF), is mostly described in pediatric populations. Adult-onset CFLD lacks sufficient characterization and diagnostic tools. METHODS: A cohort of CF patients without CFLD during childhood were followed for up to 38 years with serologic testing, imaging, and noninvasive fibrosis markers. Historical CFLD diagnostic criteria were compared with a newly proposed CFLD criteria...
April 19, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28414057/non-invasive-assessment-of-liver-fibrosis-in-patients-with-hbv-related-chronic-liver-disease-undergoing-antiviral-treatment-a-preliminary-study
#18
Cristina Stasi, Elena Salomoni, Umberto Arena, Giampaolo Corti, Paolo Montalto, Filippo Bartalesi, Fabio Marra, Giacomo Laffi, Stefano Milani, Anna Linda Zignego, Massimo Pinzani
In chronic hepatitis B (CHB) patients, fibrosis assessment during antiviral treatment is a key step in the clinical management. Aim of this study was to evaluate the performance of elastography in assessing fibrosis stage in CHB before and after two years of nucleoside/nucleotide analogues (NUC) treatment in comparison with indirect serum markers. CHB diagnosis was made according to standard criteria. A clinical and virological evaluation was performed at baseline and again at 3, 6, 9, 12 18, and 24 months during treatment...
July 5, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28413495/perioperative-application-of-salvianolate-on-oxidative-stress-and-plasma-imd-adm2-in-patients-with-acute-myocardial-infarction-undergoing-pci
#19
Qiang Zhang, Fengjun Jiao, Chongjun Hua
The present study was conducted to investigate the effects of salvianolate on perioperative oxidative stress and plasma Intermedin/adrenomedullin 2 (IMD/ADM2) in patients with acute myocardial infarction (AMI) undergoing percutaneous coronary intervention (PCI). The clinical data of 108 patients with AMI treated by PCI were retrospectively analyzed. According to the use of salvianolate in perioperative period, the patients were divided into the study group (n=62) and the control group (n=46). The control group was given routine treatment while the study group was given routine treatment combined with intravenous infusion of salvianolate (200 mg administered once at 24 h before operation, once/day after operation, 1 week later, the curative effect was observed)...
April 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28403096/the-efficiency-and-safety-of-fascia-iliaca-block-for-pain-control-after-total-joint-arthroplasty-a-meta-analysis
#20
Peng Zhang, Jifeng Li, Yuze Song, Xiao Wang
BACKGROUND: This meta-analysis aimed to perform a meta-analysis including randomized controlled trials (RCTs) to assess the efficiency and safety of fascia iliaca block (FIB) for pain control in patients undergoing total joint arthroplasty (TJA). METHODS: A systematic search was performed in Medline (1966-2017.03), PubMed (1966-2017.03), Embase (1980-2017.03), ScienceDirect (1985-2017.03) and the Cochrane Library. Study evaluated the efficiency and safety of FIB in TJA was selected...
April 2017: Medicine (Baltimore)
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