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https://www.readbyqxmd.com/read/28430465/elemental-topological-dirac-semimetal-%C3%AE-sn-on-insb-111
#1
Cai-Zhi Xu, Yang-Hao Chan, Yige Chen, Peng Chen, Xiaoxiong Wang, Catherine Dejoie, Man-Hong Wong, Joseph Andrew Hlevyack, Hyejin Ryu, Hae-Young Kee, Nobumichi Tamura, Mei-Yin Chou, Zahid Hussain, Sung-Kwan Mo, Tai-Chang Chiang
Three-dimensional (3D) topological Dirac semimetals (TDSs) are rare but important as a versatile platform for exploring exotic electronic properties and topological phase transitions. A quintessential feature of TDSs is 3D Dirac fermions associated with bulk electronic states near the Fermi level. Using angle-resolved photoemission spectroscopy, we have observed such bulk Dirac cones in epitaxially grown α-Sn films on InSb(111), the first such TDS system realized in an elemental form. First-principles calculations confirm that epitaxial strain is key to the formation of the TDS phase...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430248/accurate-determination-of-dielectric-permittivity-of-polymers-from-75%C3%A2-%C3%A2-ghz-to-1-6%C3%A2-%C3%A2-thz-using-both-s-parameters-and-transmission-spectroscopy
#2
Tianying Chang, Xiansheng Zhang, Xiaoxuan Zhang, Hong-Liang Cui
Interactions of terahertz (THz) electromagnetic radiation with polymer materials have been studied recently with increasing depth and breadth, for purposes of both using polymers in fabricating THz optical components such as lenses, waveplates, waveguides, and sample holders/containers, and employing THz spectral imaging as a new tool for nondestructive testing of polymer composite structures. Either endeavor cannot even begin without a quantitative knowledge of the complex dielectric permittivity, i.e., the propagation and attenuation properties of such polymers in the requisite wave band...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28397120/evaluating-impacts-of-recharging-partially-treated-wastewater-on-groundwater-aquifer-in-semi-arid-region-by-integration-of-monitoring-program-and-gis-technique
#3
Tamer M Alslaibi, Yasser Kishawi, Ziyad Abunada
The current study investigates the impact of recharging of partially treated wastewater through an infiltration basin on the groundwater aquifer quality parameters. A monitoring program supported by a geographic information analysis (GIS) tool was used to conduct this study. Groundwater samples from the entire surrounding boreholes located downstream the infiltration basin, in addition to samples from the recharged wastewater coming from the Beit Lahia wastewater treatment (BLWWTP), were monitored and analysed between 2011 and 2014...
April 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28394519/-genetic-risk-factors-for-sporadic-germ-cell-testicular-tumors
#4
M V Nemtsova, E V Ivkin, A A Tryakin, V V Rudenko, I S Dantsev, S A Tyulyandin, O B Loran
INTRODUCTION: Approximately 95% of all testicular cancers are testicular germ cell tumors (GCTTs), represented by seminoma and nonseminoma germ cell testicular cancer. There is a hypothesis that the formation of GCTTs begins in early embryogenesis being a part of testicular dysgenesis syndrome (TDS). AIM: To determine the role of genetic factors in the development of GCTTs. MATERIALS AND METHODS: We studied the frequency of alleles and genotypes KITLG (rs995030, rs1508595), SPRY4 (rs4624820, rs6897876) and BAK1 (rs210138) in 97 fertile men (control), and 73 patients with GCTTs (34 seminoma and 39 nonseminoma)...
April 2017: Urologii︠a︡
https://www.readbyqxmd.com/read/28393855/enhanced-terahertz-radiation-generation-of-photoconductive-antennas-based-on-manganese-ferrite-nanoparticles
#5
Weien Lai, Oday Mazin Abdulmunem, Pablo Del Pino, Beatriz Pelaz, Wolfgang J Parak, Qian Zhang, Huaiwu Zhang
This paper presents a significant effect of manganese ferrite nanoparticles (MnFe2O4 NPs) on the increase of the surface photoconductivity of semiconductors. Herein, the optical characterization of photo-excited carriers of silicon coated with MnFe2O4 NPs was studied by using THz time-domain spectroscopy (THz-TDs). We observed that silicon coated with MnFe2O4 NPs provided a significantly enhanced attenuation of THz radiation in comparison with bare silicon substrates under laser irradiation. The experimental results were assessed in the context of a surface band structure model of semiconductors...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28372940/clonidine-use-in-the-outpatient-management-of%C3%A2-severe-secondary-dystonia
#6
C Sayer, D E Lumsden, M Kaminska, J-P Lin
OBJECTIVE: To evaluate the safety, efficacy and effective dosage of clonidine in the outpatient (OP) management of secondary dystonia. METHODS: A retrospective analysis of children and young people (CAYP) prescribed clonidine in an OP clinic between January 2011 and November 2013 for dystonia management. Of 224 children receiving clonidine, 149/224 did not have a movement disorder and 12/224 had no data leaving 63 movement disorder cases, 15/63 managed as in-patients, 15/48 suffered from tics leaving 33/63 for OP evaluation...
March 14, 2017: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/28362450/multivariate-quantification-of-mebendazole-polymorphs-by-terahertz-time-domain-spectroscopy-thz-tds
#7
Vitor H da Silva, Francisco S Vieira, Jarbas J R Rohwedder, Celio Pasquini, Claudete F Pereira
This work presents an analytical method based on terahertz-time domain spectroscopy (THz-TDS) and partial least squares (PLS) regression models to quantify mebendazole (MBZ) polymorphs (forms A, B and C) in pharmaceutical raw material. Mebendazole polymorphs A, B and C were quantified with RMSEP values of 1.5% w/w, 1.2% w/w and 1.8% w/w, respectively. The limits of detection (LOD) ranges obtained with the best PLS regression models were 2.7-4.3% w/w, 2.9-4.0% w/w and 2.4-3.1% w/w, for polymorphs A, B and C, respectively...
March 31, 2017: Analyst
https://www.readbyqxmd.com/read/28357720/assessment-of-tap-water-quality-and-corrosion-scales-from-the-selected-distribution-systems-in-northern-pakistan
#8
Shams Ali Baig, Zimo Lou, Muzaffar Ali Baig, Muhammad Qasim, Dilawar Farhan Shams, Qaisar Mahmood, Xinhua Xu
Corrosion deposits formed within drinking water distribution systems deteriorate drinking water quality and resultantly cause public health consequences. In the present study, an attempt was made to investigate the concurrent conditions of corrosion scales and the drinking water quality in selected water supply schemes (WSS) in districts Chitral, Peshawar, and Abbottabad, northern Pakistan. Characterization analyses of the corrosion by-products revealed the presence of α-FeOOH, γ-FeOOH, Fe3O4, and SiO2 as major constituents with different proportions...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28352662/experimentally-induced-testicular-dysgenesis-syndrome-originates-in-the-masculinization-programming-window
#9
Sander van den Driesche, Karen R Kilcoyne, Ida Wagner, Diane Rebourcet, Ashley Boyle, Rod Mitchell, Chris McKinnell, Sheila Macpherson, Roland Donat, Chitranjan J Shukla, Anne Jorgensen, Ewa Rajpert-De Meyts, Niels E Skakkebaek, Richard M Sharpe
The testicular dysgenesis syndrome (TDS) hypothesis, which proposes that common reproductive disorders of newborn and adult human males may have a common fetal origin, is largely untested. We tested this hypothesis using a rat model involving gestational exposure to dibutyl phthalate (DBP), which suppresses testosterone production by the fetal testis. We evaluated if induction of TDS via testosterone suppression is restricted to the "masculinization programming window" (MPW), as indicated by reduction in anogenital distance (AGD)...
March 23, 2017: JCI Insight
https://www.readbyqxmd.com/read/28347757/tds-exposure-project-how-and-when-to-consider-seasonalityin-a-total-diet-study
#10
Chabi Fabrice Elegbede, Alexandra Papadopoulos, Anna Elena Kolbaum, Aida Turrini, Lorenza Mistura, Oliver Lindtner, Véronique Sirot
Seasonality is a key issue of total diet studies (TDS), as season may impact consumption patterns and concentrations of food chemicals, then exposure levels. This work aimed at analyzing the impact on dietary exposure of different options of seasonality management, to propose guidelines for TDS sampling. Dietary exposure to nine chemicals was assessed for adults and children from the second French Individual and National Food Consumption Survey: arsenic, copper, manganese, dioxins, furans, dioxin-like and non dioxin-like PCBs, deoxinivalenol and ochratoxin A...
March 27, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28343275/potential-toxic-elements-in-stream-sediments-soils-and-waters-in-an-abandoned-radium-mine-central-portugal
#11
I M H R Antunes, A M R Neiva, M T D Albuquerque, P C S Carvalho, A C T Santos, Pedro P Cunha
The Alto da Várzea radium mine (AV) exploited ore and U-bearing minerals, such as autunite and torbernite. The mine was exploited underground from 1911 to 1922, closed in 1946 without restoration, and actually a commercial area is deployed. Stream sediments, soils and water samples were collected between 2008 and 2009. Stream sediments are mainly contaminated in As, Th, U and W, which is related to the AV radium mine. The PTEs, As, Co, Cr, Sr, Th, U, W, Zn, and electrical conductivity reached the highest values in soils collected inside the mine influence...
March 25, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28330736/hyperspectral-imaging-using-near-infrared-spectroscopy-to-monitor-coat-thickness-uniformity-in-the-manufacture-of-a-transdermal-drug-delivery-system
#12
Naresh Pavurala, Xiaoming Xu, Yellela S R Krishnaiah
Hyperspectral imaging using near infrared spectroscopy (NIRS) integrates spectroscopy and conventional imaging to obtain both spectral and spatial information of materials. The non-invasive and rapid nature of hyperspectral imaging using NIRS makes it a valuable process analytical technology (PAT) tool for in-process monitoring and control of the manufacturing process for transdermal drug delivery systems (TDS). The focus of this investigation was to develop and validate the use of Near Infra-red (NIR) hyperspectral imaging to monitor coat thickness uniformity, a critical quality attribute (CQA) for TDS...
March 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28323123/circumventing-intratumoral-heterogeneity-to-identify-potential-therapeutic-targets-in-hepatocellular-carcinoma
#13
Ao Huang, Xin Zhao, Xin-Rong Yang, Fu-Qiang Li, Xin-Lan Zhou, Kui Wu, Xin Zhang, Qi-Man Sun, Ya Cao, Hong-Mei Zhu, Xiang-Dong Wang, Huan-Ming Yang, Jian Wang, Zhao-You Tang, Yong Hou, Jia Fan, Jian Zhou
BACKGROUND AND AIMS: Intratumoral heterogeneity (ITH) challenges identifying mutations with target therapy potential whereas circulating cell-free DNAs (cfDNAs) in blood could possibly reflect the entire mutation spectrum in certain tumors. We investigated how to minimize the limit of ITH for profiling hepatocellular carcinoma (HCC). METHODS: Thirty-two multi-regional tumor samples from five patients were subjected to whole exome sequencing (WES) and targeted deep sequencing (TDS); matched preoperative cfDNAs were sequenced accordingly...
March 17, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28321680/environmental-effects-of-crude-oil-spill-on-the-physicochemical-and-hydrobiological-characteristics-of-the-nun-river-niger-delta
#14
Augustine O Ifelebuegu, Justina E Ukpebor, Anita U Ahukannah, Ernest O Nnadi, Stephen C Theophilus
Oil spill pollution has remained a source of several international litigations in the Niger Delta region of Nigeria. In this paper, we examined the impacts of small recurrent crude oil spills on the physicochemical, microbial and hydrobiological properties of the Nun River, a primary source of drinking water, food and recreational activities for communities in the region. Samples were collected from six sampling points along the stretch of the lower Nun River over a 3-week period. Temperature, pH salinity, turbidity, total suspended solids, total dissolved solids, dissolved oxygen, phosphate, nitrate, heavy metals, BTEX, PAHs and microbial and plankton contents were assessed to ascertain the quality and level of deterioration of the river...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28318076/uk-policy-statements-on-testosterone-deficiency
#15
Geoffrey Hackett, Michael Kirby, David Edwards, T Hugh Jones, Jonathan Rees, Asif Muneer
To address widespread media and scientific concerns over the appropriate treatment of TDS with Testosterone Therapy (T Therapy), the Executive Committee of the British Society for Sexual Medicine developed eight consensus statements, based on current scientific evidence to address these controversial issues. These statements were in no-way designed to replace the published evidence-based guidelines on the subject developed by various professional organisations, but to provide specific answers to several current controversial issues...
March 2017: International Journal of Clinical Practice
https://www.readbyqxmd.com/read/28292717/test-retest-reproducibility-of-quantitative-binding-measures-of-11-c-ro15-4513-a-pet-ligand-for-gabaa-receptors-containing-alpha5-subunits
#16
Colm J McGinnity, Daniela A Riaño Barros, Lula Rosso, Mattia Veronese, Gaia Rizzo, Alessandra Bertoldo, Rainer Hinz, Federico E Turkheimer, Matthias J Koepp, Alexander Hammers
INTRODUCTION: Alteration of γ-aminobutyric acid "A" (GABAA) receptor-mediated neurotransmission has been associated with various neurological and psychiatric disorders. [(11)C]Ro15-4513 is a PET ligand with high affinity for α5-subunit-containing GABAA receptors, which are highly expressed in limbic regions of the human brain (Sur et al., 1998). We quantified the test-retest reproducibility of measures of [(11)C]Ro15-4513 binding derived from six different quantification methods (12 variants)...
March 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28290300/identification-of-drivers-of-dis-liking-based-on-dynamic-sensory-profiles-comparison-of-temporal-dominance-of-sensations-and-temporal-check-all-that-apply
#17
Gastón Ares, Florencia Alcaire, Lucía Antúnez, Leticia Vidal, Ana Giménez, John C Castura
Temporal Dominance of Sensations (TDS) and Temporal Check-all-that-apply (TCATA) are two multi-attribute methods for dynamic sensory characterization. Previous research has shown that both methodologies provide complementary information. However, it remains an open question which of the two approaches better explains consumers' hedonic perception of products. In this context, the aim of the present work was to compare TDS and TCATA in terms of their ability to identify the influence of the dynamic sensory profile of food products on consumer overall liking scores...
February 2017: Food Research International
https://www.readbyqxmd.com/read/28285400/how-does-environmental-variation-affect-the-distribution-of-dragonfly-larvae-odonata-in-the-amazon-cerrado-transition-zone-in-central-brazil
#18
T P Mendes, A Luiza-Andrade, H S R Cabette, L Juen
This study investigated the effects of environmental variation on assemblages of dragonfly larvae (Odonata). We hypothesize that there is a significant correlation between species richness, species composition, and abundance of Odonata individuals, and habitat integrity and abiotic variables. To test this hypothesis, we sampled odonate larvae at 12 streams in the Suiá-Miçú River basin in Mato Grosso, Brazil, during three different periods of the year. Local physical and chemical variables (temperature, pH, turbidity, electrical conductivity (EC), dissolved oxygen (DO), total dissolved solids (TDS), and oxidation reduction potential (ORP)) were measured at each site using a multi-parameter probe, and integrity was assessed using the Habitat Integrity Index (HII)...
March 11, 2017: Neotropical Entomology
https://www.readbyqxmd.com/read/28284001/assessing-impact-of-effluent-discharge-on-irrigation-water-quality-in-southern-region-of-khyber-pakhtunkhwa-pakistan
#19
Shabnam Zafar, Azim Khan, Hidayat Ullah, Muhammad Sohail Khan, Ilham Khan, Asma Hameed, Shafeeq Ur Rehman, Ghazala Yasmeen
Chemical quality and extent of pollution in effluent-contaminated irrigation water collected from two sectors (X and Y) of peri-urban southern regions of Khyber Pakhtunkhwa, Pakistan, were investigated. Various physico-chemical parameters like pH, EC, TS, TSS, TDS, TH, cations (Na(1+), K(1+), Li(1+), Ca(2+), Mg(2+)), anions (Cl(1-), F(1-), HCO3(1-), NO3(1-), SO4(2-)), and heavy metals (Cr, Fe, Cu, Zn, Pb, Cd) were determined. The data indicated wide ranges of variation in all the parameters. Concentration of physico-chemical properties such as EC, TS, TSS, TH, Li(1+), Ca(2+), Mg(2+), and HCO3(1-) and heavy metals (Cr, Fe, Cu, and Cd) exceeded WHO permissible limits...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28278781/phytoremediation-potential-of-water-caltrop-trapa-natans-l-using-municipal-wastewater-of-the-activated-sludge-process-based-municipal-wastewater-treatment-plant
#20
Vinod Kumar, A K Chopra
Phytoremediation experiments were carried out to assess the phytoremediation potential of water caltrop (Trapa natans L.) using municipal wastewater collected from the activated sludge process- (ASP) based municipal wastewater treatment plant. The results revealed that T. natans significantly (P ≤ .05/P ≤ .01/P ≤ .001) reduced the contents of total dissolved solids (TDS), electrical conductivity (EC), biochemical oxygen demand (BOD5), chemical oxygen demand, total Kjeldahl nitrogen, phosphate ([Formula: see text]), sodium (Na(+)), potassium (K(+)), calcium (Ca(2+)), magnesium (Mg(2+)), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), lead (Pb), zinc (Zn), standard plate count, and most probable number of the municipal wastewater after phytoremediation experiments...
February 22, 2017: Environmental Technology
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