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https://www.readbyqxmd.com/read/28720879/microwave-tunable-metamaterial-based-on-semiconductor-to-metal-phase-transition
#1
Guanqiao Zhang, He Ma, Chuwen Lan, Rui Gao, Ji Zhou
A microwave tunable metamaterial utilizing the semiconductor-to-metal transition of vanadium dioxide (VO2) is proposed, experimentally demonstrated and theoretically scrutinized. Basic concept of the design involves the combination of temperature-dependent hysteresis in VO2 with resonance induced heating, resulting in a nonlinear response to power input. A lithographically prepared gold split-rings resonator (SRR) array deposited with VO2 thin film is fabricated. Transmission spectra analysis shows a clear manifestation of nonlinearity, involving power-dependence of resonant frequency as well as transmitted intensity at both elevated and room temperature...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28719849/selective-cathodic-microbial-biofilm-retention-allows-a-high-current-to-sulfide-efficiency-in-sulfate-reducing-microbial-electrolysis-cells
#2
Guillermo Pozo, Yang Lu, Sebastien Pongy, Jürg Keller, Pablo Ledezma, Stefano Freguia
Selective microbial retention is of paramount importance for the long-term performance of cathodic sulfate reduction in microbial electrolysis cells (MECs) due to the slow growth rate of autotrophic sulfate-reducing bacteria. In this work, we investigate the biofilm retention and current-to-sulfide conversion efficiency using carbon granules (CG) or multi-wall carbon nanotubes deposited on reticulated vitreous carbon (MWCNT-RVC) as electrode materials. For ~2months, the MECs were operated at sulfate loading rates of 21 to 309gSO4 -S/m(2)/d...
July 12, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28695648/three-glycosylated-serine-rich-repeat-proteins-play-a-pivotal-role-in-adhesion-and-colonization-of-the-pioneer-commensal-bacterium-streptococcus-salivarius
#3
Benoit Couvigny, Nicolas Lapaque, Lionel Rigottier-Gois, Alain Guillot, Sophie Chat, Thierry Meylheuc, Saulius Kulakauskas, Manfred Rohde, Michel-Yves Mistou, Pierre Renault, Joel Doré, Romain Briandet, Pascale Serror, Eric Guédon
Bacterial adhesion is a critical step for colonization of the host. The pioneer colonizer and commensal bacterium of the human gastrointestinal tract, Streptococcus salivarius, has strong adhesive properties but the molecular determinants of this adhesion remain uncharacterized. Serine-rich repeat (SRR) glycoproteins are a family of adhesins that fulfill an important role in adhesion. In general, Gram-positive bacterial genomes have a unique SRR glycoprotein-encoding gene. We demonstrate that S. salivarius expresses three large and glycosylated surface-exposed proteins - SrpA, SrpB and SrpC - that show characteristics of SRR glycoproteins and are secreted through the accessory SecA2/Y2 system...
July 11, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28636536/intake-of-red-and-processed-meat-and-risk-of-renal-cell-carcinoma-a-meta-analysis-of-observational-studies
#4
Shaojing Zhang, Qingwei Wang, Juanjuan He
BACKGROUND: Findings on the association between intake of red and processed meat with renal cell carcinoma (RCC) risk are mixed. We conducted a meta-analysis to investigate this association. MATERIALS AND METHODS: Eligible studies up to August 31, 2016, were identified and retrieved by searching the MEDLINE and Embase databases along with manual review of the reference lists from the retrieved studies. The quality of the included studies was evaluated using the Newcastle-Ottawa Quality Assessment Scale...
June 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28616886/cancer-incidence-among-boat-building-workers-exposed-to-styrene
#5
Avima M Ruder, Stephen J Bertke
BACKGROUND: A cancer incidence analysis was conducted on The National Institute for Occupational Safety and Health boat-builders cohort exposed to styrene, a possible carcinogen. METHODS: Standardized incidence ratios (SIR) and standardized rate ratios (SRR) were calculated using national and Washington State rates and a person-years analysis program. RESULTS: Among 3704 workers living in Washington State after 1991, when cancer registry case accrual began, 516 first primary diagnoses occurred through 2007...
July 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28580277/expression-and-functional-assessment-of-candidate-type-2-diabetes-susceptibility-genes-identify-four-new-genes-contributing-to-human-insulin-secretion
#6
Fatou K Ndiaye, Ana Ortalli, Mickaël Canouil, Marlène Huyvaert, Clara Salazar-Cardozo, Cécile Lecoeur, Marie Verbanck, Valérie Pawlowski, Raphaël Boutry, Emmanuelle Durand, Iandry Rabearivelo, Olivier Sand, Lorella Marselli, Julie Kerr-Conte, Vikash Chandra, Raphaël Scharfmann, Odile Poulain-Godefroy, Piero Marchetti, François Pattou, Amar Abderrahmani, Philippe Froguel, Amélie Bonnefond
OBJECTIVES: Genome-wide association studies (GWAS) have identified >100 loci independently contributing to type 2 diabetes (T2D) risk. However, translational implications for precision medicine and for the development of novel treatments have been disappointing, due to poor knowledge of how these loci impact T2D pathophysiology. Here, we aimed to measure the expression of genes located nearby T2D associated signals and to assess their effect on insulin secretion from pancreatic beta cells...
June 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28578422/three-dimensional-anisotropic-metamaterials-as-triaxial-optical-inclinometers
#7
Kriti Agarwal, Chao Liu, Daeha Joung, Hyeong-Ryeol Park, Sang-Hyun Oh, Jeong-Hyun Cho
Split-ring resonators (SRRs) present an attractive avenue for the development of micro/nano scale inclinometers for applications like medical microbots, military hardware, and nanosatellite systems. However, the 180° isotropy of their two-dimensional structure presents a major hurdle. In this paper, we present the design of a three-dimensional (3D) anisotropic SRR functioning as a microscale inclinometer enabling it to remotely sense rotations from 0° to 360° along all three axes (X, Y, and Z), by employing the geometric property of a 3D structure...
June 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28574444/validation-of-the-performance-of-international-ovarian-tumor-analysis-iota-methods-in-the-diagnosis-of-early-stage-ovarian-cancer-in-a-non-screening-population
#8
Wouter Froyman, Laure Wynants, Chiara Landolfo, Tom Bourne, Lil Valentin, Antonia Testa, Povilas Sladkevicius, Dorella Franchi, Daniela Fischerova, Luca Savelli, Ben Van Calster, Dirk Timmerman
BACKGROUND: The aim of this study was to assess and compare the performance of different ultrasound-based International Ovarian Tumor Analysis (IOTA) strategies and subjective assessment for the diagnosis of early stage ovarian malignancy. METHODS: This is a secondary analysis of a prospective multicenter cross-sectional diagnostic accuracy study that included 1653 patients recruited at 18 centers from 2009 to 2012. All patients underwent standardized transvaginal ultrasonography by experienced ultrasound investigators...
June 2, 2017: Diagnostics
https://www.readbyqxmd.com/read/28569856/magnetic-annihilation-of-the-dark-mode-in-a-strongly-coupled-bright-dark-terahertz-metamaterial
#9
Manukumara Manjappa, Shuvan Prashant Turaga, Yogesh Kumar Srivastava, Andrew Anthony Bettiol, Ranjan Singh
Dark mode in metamaterials has become a vital component in determining the merit of the Fano type of interference in the system. Its strength dictates the enhancement and suppression in the amplitude and Q-factors of resulting resonance features. In this work, we experimentally probe the effect of strong near-field coupling on the strength of the dark mode in a concentrically aligned bright resonator and a dark split ring resonator (SRR) system exhibiting the classical analog of the electromagnetically induced transparency effect...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28533113/a-novel-serine-racemase-inhibitor-suppresses-neuronal-over-activation-in-vivo
#10
Hisashi Mori, Ryogo Wada, Satoyuki Takahara, Yoshikazu Horino, Hironori Izumi, Tetsuya Ishimoto, Tomoyuki Yoshida, Mineyuki Mizuguchi, Takayuki Obita, Hiroaki Gouda, Shuichi Hirono, Naoki Toyooka
Serine racemase (SRR) is an enzyme that produces d-serine from l-serine. d-Serine acts as an endogenous coagonist of NMDA-type glutamate receptors (NMDARs), which regulate many physiological functions. Over-activation of NMDARs induces excitotoxicity, which is observed in many neurodegenerative disorders and epilepsy states. In our previous works on the generation of SRR gene knockout (Srr-KO) mice and its protective effects against NMDA- and Aβ peptide-induced neurodegeneration, we hypothesized that the regulation of NMDARs' over-activation by inhibition of SRR activity is one such therapeutic strategy to combat these disease states...
May 11, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28515424/a-split-ring-resonator-dielectric-probe-for-near-field-dielectric-imaging
#11
Dmitry Isakov, Chris J Stevens, Flynn Castles, Patrick S Grant
A single split-ring resonator (SRR) probe for 2D surface mapping and imaging of relative dielectric permittivity for the characterisation of composite materials has been developed. The imaging principle, the analysis and the sensitivity of the SRR surface dielectric probe data is described. The surface dielectric properties of composite materials in the frequency range 1-3 GHz have been measured based on the magnetic resonance frequency of the transmission loss of the SRR dielectric probe when in contact with the surface...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28490112/real-time-monitoring-of-sucrose-sorbitol-d-glucose-and-d-fructose-concentration-by-electromagnetic-sensing
#12
Supakorn Harnsoongnoen, Anuwat Wanthong
Magnetic sensing at microwave frequencies for real-time monitoring of sucrose, sorbitol, d-glucose and d-fructose concentrations is reported. The sensing element was designed based on a coplanar waveguide (CPW) loaded with a split ring resonator (SRR), which was fabricated on a DiClad 880 substrate with a thickness of 1.6mm and relative permittivity (εr) of 2.2. The magnetic sensor was connected to a Vector Network Analyzer (VNA) and the electromagnetic interaction between the samples and sensor was analyzed...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28479763/microdissection-testicular-sperm-extraction-in-men-with-nonobstructive-azoospermia-experience-of-king-saud-university-medical-city-riyadh-saudi-arabia
#13
Saleh Binsaleh, Dulaim Alhajeri, Khaled Madbouly
OBJECTIVES: Microdissection testicular sperm extraction (micro-TESE) is an optimal technique of sperm extraction for intracytoplasmic sperm injection. This study is to present our experience in micro-TESE and evaluate the relation of its sperm retrieval rate (SRR) with patients' characteristics, testicular functions, and histological parameters as well as previous sperm retrieval interventions. MATERIALS AND METHODS: We retrospectively reviewed records of 255 patients with nonobstructive azoospermia who underwent micro-TESE between 2011 and 2014...
April 2017: Urology Annals
https://www.readbyqxmd.com/read/28432309/fano-resonance-with-high-local-field-enhancement-under-azimuthally-polarized-excitation
#14
Wuyun Shang, Fajun Xiao, Weiren Zhu, Hongsen He, Malin Premaratne, Ting Mei, Jianlin Zhao
Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB)...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427188/consumption-of-fruits-and-vegetables-and-risk-of-renal-cell-carcinoma-a-meta-analysis-of-observational-studies
#15
Shaojing Zhang, Zhankui Jia, Zechen Yan, Jinjian Yang
BACKGROUND: There have been inconsistent results about the association between consumption of fruits and vegetables and renal cell carcinoma (RCC) risk. We conducted a meta-analysis of the published observational studies to explore this association. RESULTS: Nineteen observational studies (4 cohort, 1 pooled and 14 case-control studies), involving 10,215 subjects with RCC were part of this meta-analysis. The SRR for the highest vs. the lowest intake of vegetables was 0...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415641/identification-and-screening-of-effective-protective-antigens-for-channel-catfish-against-streptococcus-iniae
#16
Yajun Wang, Erlong Wang, Yang He, Kaiyu Wang, Qian Yang, Jun Wang, Yi Geng, Defang Chen, Xiaoli Huang, Ping Ouyang, Weimin Lai, Cunbin Shi
Vaccination is a potential approach for prevention and control of disease in fish. The use of genetically engineered vaccines is an effective method and a green intervention to control bacterial infection in aquaculture. However, efforts to develop these vaccines are limited by the lack of conserved protective antigens. In this study, three candidate immunogens (Srr, NeuA, and Hsp) of the pathogenic Streptococcus iniae strain DGX07 isolated from diseased channel catfish were identified and analyzed. Molecular cloning, expression, and purification of candidate antigen genes were carried out to obtain the candidate immunogens in the form of recombinant subunit vaccines...
May 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28408901/serine-rich-repeat-adhesins-contribute-to-streptococcus-gordonii-induced-maturation-of-human-dendritic-cells
#17
Eun Byeol Ko, Sun Kyung Kim, Ho Seong Seo, Cheol-Heui Yun, Seung Hyun Han
Dendritic cells (DCs) play a pivotal role in the induction of immunity by recognition, capture, process, and presentation of antigens from infectious microbes. Streptococcus gordonii is able to cause life-threatening systemic diseases such as infective endocarditis. Serine-rich repeat (SRR) glycoproteins of S. gordonii are sialic acid-binding adhesins mediating the bacterial adherence to the host and the development of infective endocarditis. Thus, the SRR adhesins are potentially involved in the bacterial adherence to DCs and the maturation and activation of DCs required for the induction of immunity to S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28389625/association-of-body-mass-index-with-bladder-cancer-risk-a-dose-response-meta-analysis-of-prospective-cohort-studies
#18
REVIEW
Limin Zhao, Xiaoqin Tian, Xueyan Duan, Yongxiu Ye, Min Sun, Junfang Huang
Prospective epidemiologic studies on the association between body mass index (BMI) and bladder cancer yielded inconsistent findings. This study sought to quantitatively summarize the evidence by performing a dose-response meta-analysis on prospective cohort studies. Eligible studies were retrieved via PubMed and Embase databases, and by manual review of the references. Linear and nonlinear trend analyses were conducted to explore the relationships between BMI and bladder cancer risk. Meta-analyses on the categories of overweight and obesity were also conducted...
May 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28379559/sperm-recovery-and-icsi-outcomes-in-klinefelter-syndrome-a-systematic-review-and-meta-analysis
#19
Giovanni Corona, Alessandro Pizzocaro, Fabio Lanfranco, Andrea Garolla, Fiore Pelliccione, Linda Vignozzi, Alberto Ferlin, Carlo Foresta, Emmanuele A Jannini, Mario Maggi, Andrea Lenzi, Daniela Pasquali, Sandro Francavilla
BACKGROUND: Specific factors underlying successful surgical sperm retrieval rates (SRR) or pregnancy rates (PR) after testicular sperm extraction (TESE) in adult patients with Klinefelter syndrome (KS) have not been completely clarified. OBJECTIVE AND RATIONALE: The aim of this review was to meta-analyse the currently available data from subjects with KS regarding SRRs as the primary outcome. In addition, when available, PRs and live birth rates (LBRs) after the ICSI technique were also investigated as secondary outcomes...
May 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28373812/adding-spatial-flexibility-to-source-receptor-relationships-for-air-quality-modeling
#20
E Pisoni, A Clappier, B Degraeuwe, P Thunis
To cope with computing power limitations, air quality models that are used in integrated assessment applications are generally approximated by simpler expressions referred to as "source-receptor relationships (SRR)". In addition to speed, it is desirable for the SRR also to be spatially flexible (application over a wide range of situations) and to require a "light setup" (based on a limited number of full Air Quality Models - AQM simulations). But "speed", "flexibility" and "light setup" do not naturally come together and a good compromise must be ensured that preserves "accuracy", i...
April 2017: Environmental Modelling & Software: with Environment Data News
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