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A Reum Kim, Ki Bum Ahn, Hyun Young Kim, Ho Seong Seo, Cheol-Heui Yun, Seung Hyun Han
INTRODUCTION: Streptococcus gordonii is a predominant member of the oral microflora and has been isolated from root canals of teeth with refractory apical periodontitis. Biofilm formation is important for various dental diseases, and S. gordonii is involved in dental biofilm formation as an early colonizer. Although serine-rich repeat (SRR) adhesins of S. gordonii such as gordonii surface protein B (GspB) are associated with bacterial colonization, the role of GspB in biofilm formation is not clearly understood...
October 18, 2016: Journal of Endodontics
Yuqin Wang, Baochan Wang, Shiyan Yan, Feng Shen, Haixia Cao, Jiangao Fan, Rongrong Zhang, Jun Gu
PURPOSE: Questions remain uncertainty regarding the gender differences in the relationship between type 2 diabetes (T2DM) and liver cancer risk. By considering several confounding factors, we aimed to identify this issue according to a meta-analysis of cohort studies. METHODS: We searched EMBASE and MEDLINE for studies on the association between T2DM and risk of liver cancer up to November 30, 2014. A random-effects model was performed to calculate summary relative risks (SRRs) with corresponding 95% confidence intervals (CIs)...
September 22, 2016: Annals of Epidemiology
Raquel Rose Silva Correia, Jean Remy Davée Guimarães
Recent studies have shown Hg methylation in mangrove sediments, however, little is known about the different microorganism consortia involved. We investigated the participation of prokaryotes in general, iron-reducing bacteria-IRB, sulfate-reducing bacteria-SRB, methanogens and fungi in Hg methylation and sulfate reduction rates (SRR) in mangrove sediments using iron amendments for IRB and specific inhibitors for the other microorganisms. Sediment samples were collected from two mangrove zones, tidal flat and mangrove forest (named root sediments)...
October 14, 2016: Chemosphere
M Anne George, Andrew Jin, Mariana Brussoni, Christopher E Lalonde, Rod McCormick
BACKGROUND: Children and youth worldwide are at high risk of injury resulting in morbidity, disability or mortality. Disparities in risk exist between and within countries, and by sex and ethnicity. Our aim is to contribute data on disparities of injury rates for Aboriginal children and youth compared with those of the general population in British Columbia (BC), Canada, by examining risks for the two populations, utilizing provincial administrative data over a 24-year period. METHODS: Hospital discharge records from the provincial health care database for children and youth were used to identify injury for the years 1986 to 2009...
December 2015: Injury Epidemiology
Megan Smith, Karen Canfell
OBJECTIVES: The Australian National Cervical Screening Program (NCSP) will transition in 2017 from cytology-based screening every two years, starting from age 18-20 years, to HPV-based screening every 5 years, starting from age 25. To examine the impact of the program before this transition we analysed trends in the incidence of cervical cancer, by age and histological subtype. DESIGN, SETTING AND PARTICIPANTS: National cervical cancer incidence data, 1982-2010...
October 17, 2016: Medical Journal of Australia
Julie Hamaide, Geert De Groof, Gwendolyn Van Steenkiste, Ben Jeurissen, Johan Van Audekerke, Maarten Naeyaert, Lisbeth Van Ruijssevelt, Charlotte Cornil, Jan Sijbers, Marleen Verhoye, Annemie Van der Linden
Zebra finches are an excellent model to study the process of vocal learning, a complex socially-learned tool of communication that forms the basis of spoken human language. So far, structural investigation of the zebra finch brain has been performed ex vivo using invasive methods such as histology. These methods are highly specific, however, they strongly interfere with performing whole-brain analyses and exclude longitudinal studies aimed at establishing causal correlations between neuroplastic events and specific behavioral performances...
September 30, 2016: NeuroImage
Małgorzata Pawłowska, Krzysztof Domagalski, Beata Smok, Paweł Rajewski, Magdalena Wietlicka-Piszcz, Waldemar Halota, Andrzej Tretyn
This study evaluated the long-term (up to 4 years) efficacy and safety of entecavir ETV treatment and analysed the significance of baseline and on-treatment factors in long-term ETV outcomes in adolescents with chronic hepatitis B (CHB). We determined the cumulative virological and serological outcomes of 44 adolescents with CHB receiving ETV for up to 4 years. To investigate the dynamics of HBV DNA, ALT activity and hepatitis B e antigen (HBeAg) seroconversion over time and their associations with the considered factors, generalized estimating equation (GEE) models were used...
2016: PloS One
Kai Lin, Jeremy D Collins, Varun Chowdhary, Michael Markl, James C Carr
OBJECTIVE: To test the performance of HDA in characterizing left ventricular (LV) function and regional myocardial motion patterns in the context of cardiomyopathy based on cine cardiovascular magnetic resonance (CMR). MATERIALS AND METHODS: Following the approval of the institutional review board (IRB), standard cine images of 45 subjects, including 15 healthy volunteers, 15 patients with hypertrophic cardiomyopathy (HCM) and 15 patients with dilated cardiomyopathy (DCM) were retrospectively analyzed using HDA...
October 2016: European Journal of Radiology
Linbo Zhang, Peiheng Zhou, Haiyan Chen, Haipeng Lu, Haiyan Xie, Li Zhang, En Li, Jianliang Xie, Longjiang Deng
In this work, a high-efficiency and broadband reflective converter using ultrathin planar metamaterial (MM) composed of single-layered SRR is firstly realized. Numerical and experimental results demonstrate that the cross-polarization conversion reflectance above 0.84 is achieved from 8.6 to 18.6 GHz for linearly polarized (LP) incident waves under normal incidence. Subsequently, a multi-layered MM based on SRR enables a dramatic improvement of the recently demonstrated asymmetric transmission (AT) effect...
2016: Scientific Reports
Wanguo Liu
A systematic dynamic theory is established to deal with the optical collective resonance in metamaterial arrays. As a reference model, we consider an infinite split ring resonator (SRR) array illuminated by a linearly polarized wave and introduce an N-degree-of-freedom forced oscillator equation to simplify the coupled-mode vibration problem. We derive a strict formula of resonance frequency (RF) and its adjustable range from the steady-state response. Unlike a single SRR possesses invariant RF, it successfully explains the mechanism of RF shift effect in the SRR array when the incident angle changes...
November 30, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Francesco Ceppi, Michel Duval, Jean-Marie Leclerc, Caroline Laverdiere, Yves-Line Delva, Sonia Cellot, Pierre Teira, Henrique Bittencourt
Relapsed/refractory acute lymphoblastic leukemia (ALL) is a leading cause of death by cancer in children. Our institution has switched relapse treatment strategy to improve survival. We reviewed records of first relapse/refractory childhood ALL between 1996 and 2012. Based on length of first remission, relapse site and immunophenotype, patients were classified into two groups: standard-risk relapse (SRR) and high-risk relapse and refractory (HRRR). Before 2007, all patients were uniformly treated with the same induction as at presentation, followed by hematopoietic stem cell transplantation (HSCT)...
2016: PloS One
Chris Snowdon, Mark Johnston
Yeasts have sophisticated signaling pathways for sensing glucose, their preferred carbon source, to regulate its uptake and metabolism. One of these is the SRR pathway, which detects extracellular glucose and transmits an intracellular signal that induces expression of HXT genes. The yeast casein kinases (Ycks) are key players in this pathway. Our model of the SRR pathway had the Ycks functioning downstream of the glucose sensors, transmitting the signal from the sensors to the Mth1 and Std1 corepressors that are required for repression of HXT gene expression...
September 14, 2016: Molecular Biology of the Cell
Carolin Reimann, Margarita Puentes, Matthias Maasch, Frank Hübner, Babak Bazrafshan, Thomas J Vogl, Christian Damm, Rolf Jakoby
Microwave sensors in medical environments play a significant role due to the contact-less and non-invasive sensing mechanism to determine dielectric properties of tissue. In this work, a theranostic sensor based on Split Ring Resonators (SRRs) is presented that provides two operation modes to detect and treat tumor cells, exemplary in the liver. For the detection mode, resonance frequency changes due to abnormalities are evaluated, and in the treatment mode, microwave ablation is performed. The planar sensor structure can be integrated into a needle like a surgery tool that evokes challenges concerning size limitations and biocompatibility...
2016: Sensors
Fu-Min Fang, Hui-Ching Chuang, Shang-Yu Chou, Tai-Lin Huang, Chong-Jong Wang, Yu-Tsai Lin, Tai-Jan Chiu, Wei-Che Lin, Shau-Hsuan Li, Yan-Ye Su, Chih-Yen Chien
BACKGROUND: This study investigated the therapeutic benefit of radical resection (SRR) for clinical T4b oral cavity squamous cell carcinoma (OSCC) with partial or complete response after radical chemoradiotherapy (CRT). METHODS: At the authors' institution, 79 patients with newly diagnosed non-metastatic T4b OSCC were treated with CRT from January 2009 to December 2014. All of them were irradiated using intensity-modulated radiotherapy (IMRT), with a radical dose (median 70 Gy; range 66-76 Gy) in the gross tumor area...
September 9, 2016: Annals of Surgical Oncology
Stephen A Spector, Sean S Brummel, Caroline M Nievergelt, Adam X Maihofer, Kumud K Singh, Murli U Purswani, Paige L Williams, Rohan Hazra, Russell Van Dyke, George R Seage
The Pediatric HIV/AIDS Cohort Study (PHACS), the largest ongoing longitudinal study of perinatal HIV-infected (PHIV) and HIV-exposed, uninfected (PHEU) children in the United States, comprises the Surveillance Monitoring of Antiretroviral Therapy [ART] Toxicities (SMARTT) Study in PHEU children and the Adolescent Master Protocol (AMP) that includes PHIV and PHEU children ≥7 years. Although race/ethnicity is often used to assess health outcomes, this approach remains controversial and may fail to accurately reflect the backgrounds of ancestry-diverse populations as represented in the PHACS participants...
September 2016: Medicine (Baltimore)
Priscilla J Miranda, Nathan K McLain, Roland Hatzenpichler, Victoria J Orphan, Jesse G Dillon
The shallow-sea hydrothermal vents at White Point (WP) in Palos Verdes on the southern California coast support microbial mats and provide easily accessed settings in which to study chemolithoautotrophic sulfur cycling. Previous studies have cultured sulfur-oxidizing bacteria from the WP mats; however, almost nothing is known about the in situ diversity and activity of the microorganisms in these habitats. We studied the diversity, micron-scale spatial associations and metabolic activity of the mat community via sequence analysis of 16S rRNA and aprA genes, fluorescence in situ hybridization (FISH) microscopy and sulfate reduction rate (SRR) measurements...
2016: Frontiers in Microbiology
Xiaojian Fu, Xinxi Zeng, Tie Jun Cui, Chuwen Lan, Yunsheng Guo, Hao Chi Zhang, Qian Zhang
We investigate the resonant modes of split-ring resonator (SRR) metamaterials that contain high-permittivity BST block numerically and experimentally. We observe interesting mode-jumping phenomena from the BST-included SRR absorber structure as the excitation wave is incident perpendicularly to the SRR plane. Specifically, when the electric field is parallel to the SRR gap, the BST block in the gap will induce a mode jumping from the LC resonance to plasmonic resonance (horizontal electric-dipole mode), because the displacement current excited by the Mie resonance in the dielectric block acts as a current channel in the gap...
2016: Scientific Reports
Sara Gandini, Ignazio Stanganelli, Domenico Palli, Vincenzo De Giorgi, Giovanna Masala, Saverio Caini
BACKGROUND: The risk of skin malignancy among atopic dermatitis (AD) patients is not well established. OBJECTIVE: We reviewed the epidemiological evidence on the association between AD, naevi count, and the risk of cutaneous melanoma and keratinocyte skin cancer (KSC). METHODS: We included all studies that compared the naevi count and the risk of skin cancer (melanoma and/or KSC) between AD patients and unaffected individuals. We calculated summary relative risks (SRRs) and 95% confidence intervals (CI) through random effects models; explored correlates of between-studies heterogeneity using sub-group and sensitivity analysis; and assessed publication bias using a funnel-plot-based approach...
July 16, 2016: Journal of Dermatological Science
Ravinder Mamtani, Sohaila Cheema, Javaid Sheikh, Ahmad Al Mulla, Albert Lowenfels, Patrick Maisonneuve
OBJECTIVES: To quantify by meta-analysis the relationship between waterpipe smoking and cancer, including cancer of the head and neck, esophagus, stomach, lung and bladder. METHODS: We performed a systematic literature search to identify relevant studies, scored their quality, used fixed and random-effect models to estimate summary relative risks (SRR), evaluated heterogeneity and publication bias. RESULTS: We retrieved information from 28 published reports...
July 15, 2016: International Journal of Public Health
Sandra Van der Auwera, Alexander Teumer, Johannes Hertel, Georg Homuth, Uwe Völker, Michael J Lucht, Franziska Degenhardt, Thomas Schulze, Marcella Rietschel, Markus M Nöthen, Ulrich John, Matthias Nauck, Hans Jörgen Grabe
Schizophrenia has a considerable genetic background. Epidemiological studies suggest an inverse clinical association between schizophrenia and migraine. However, it is unclear to what extent this inverse comorbidity can be explained by genetic mechanisms or by schizophrenia-related behavioral factors. For both disorders hypotheses of glutamate N-methyl-D-aspartate (NMDA) receptor dysfunction have been developed in the past. We hypothesized that both conditions share common genetic factors with inverse effects, primary in the glutamatergic system and genes involved in NMDA activation...
September 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
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