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https://www.readbyqxmd.com/read/28438009/modulation-format-free-and-automatic-bias-control-for-optical-iq-modulators-based-on-dither-correlation-detection
#1
Xiaolei Li, Lei Deng, Xiaoman Chen, Mengfan Cheng, Songnian Fu, Ming Tang, Deming Liu
A novel automatic bias control (ABC) method for optical in-phase and quadrature (IQ) modulator is proposed and experimentally demonstrated. In the proposed method, two different low frequency sine wave dither signals are generated and added on to the I/Q bias signal respectively. Instead of power monitoring of the harmonics of the dither signal, dither-correlation detection is proposed and used to adjust the bias voltages of the optical IQ modulator. By this way, not only frequency spectral analysis isn't required but also the directional bias adjustment could be realized, resulting in the decrease of algorithm complexity and the growth of convergence rate of ABC algorithm...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28438000/development-of-limited-view-and-three-dimensional-reconstruction-method-for-analysis-of-electrohydrodynamic-jetting-behavior
#2
Yeonghyeon Gim, Dong Ho Shin, Do Yoon Moh, Han Seo Ko
For an electrohydrodynamic (EHD) jet, variables such as the direction of the meniscus and the ejection stability need to be analyzed. Thus, the EHD jet should be observed three-dimensionally (3D) because the variables can only be obtained in the 3D field, especially in unstable modes. However, if the 3D field is reconstructed from multi-directional binary images, eliminating reconstruction errors caused by invisible areas is almost impossible, even when using a tomographic technique. To solve this problem, a new 3D reconstruction method including an ellipse estimation was developed in this study...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437968/vortex-energy-flows-generated-by-core-shell-nanospheres
#3
Shih-Wen Chen, Jia-Han Li
Investigated in this paper is the interaction of light and the nanospheres composed by a dielectric core with a gold-shell cladding that causes the optical vortices inside the core and the whirlpools around the shell. Different radius ratios, dimensions and the dielectric functions of nanospheres were studied using the finite-difference time-domain method. It was found that optical vortices were most likely to occur in the regions of increased absorption cross section and reduced scattering cross section. Two optical vortices of the opposite polarity, each centered in one of the particles of a dimer are created by a nanoshell dimer...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437955/cyclic-coding-for-brillouin-optical-time-domain-analyzers-using-probe-dithering
#4
Haritz Iribas, Alayn Loayssa, Florian Sauser, Miguel Llera, Sébastien Le Floch
We study the performance limits of mono-color cyclic coding applied to Brillouin optical time-domain analysis (BOTDA) sensors that use probe wave dithering. BOTDA analyzers with dithering of the probe use a dual-probe-sideband setup in which an optical frequency modulation of the probe waves along the fiber is introduced. This avoids non-local effects while keeping the Brillouin threshold at its highest level, thus preventing the spontaneous Brillouin scattering from generating noise in the deployed sensing fiber...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437894/effect-of-anisotropic-electron-momentum-distribution-of-surface-plasmon-on-internal-photoemission-of-a-schottky-hot-carrier-device
#5
Xin-Hao Li, Jeffrey B Chou, Wei Lek Kwan, Asma M Elsharif, Sang-Gook Kim
We recently reported that an Au/TiO<sub>2</sub> photonic crystal device for photochemical energy conversion showed a sub-bandgap photoresponse centered at the surface plasmon polariton (SPP) resonant wavelength of this device. Here we developed a theoretical modeling of the internal photoemission in this device by incorporating the effects of anisotropic hot electron momentum distribution caused by SPP. The influences of interband and intraband transition, anisotropic momentum distribution of hot electrons by SPP are integrated to model the internal quantum efficiency (IQE) of this device...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437888/protective-effects-of-tranilast-on-experimental-colitis-in-rats
#6
Yoshiki Seto, Kouki Kato, Ryota Tsukada, Hiroki Suzuki, Yuuki Kaneko, Yoshiki Kojo, Hideyuki Sato, Satomi Onoue
The present study aimed to verify the efficacy of tranilast (TL) for treating inflammatory bowel disease (IBD) with the use of an experimental colitis model. The experimental colitis model was prepared by intrarectal instillation of 2,4,6-trinitrobenzenesulfonic acid (TNBS; 40mg/kg) dissolved in water containing 25% ethanol. The pharmacological effects of TL after repeated oral administration were evaluated by biomarker and histological analyses, and the pharmacokinetic behavior of TL was also examined after single oral administration...
April 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28437885/sesquiterpenes-evaluation-on-schistosoma-mansoni-survival-excretory-system-and-membrane-integrity
#7
Rosimeire Nunes de Oliveira, Karina Rodrigues Dos Santos, Tiago Manuel Fernandes Mendes, Vera Lúcia Garcia, Adriana Silva Santos Oliveira, Veronica de Lourdes Sierpe Jeraldo, Silmara Marques Allegretti
The main challenge in schistosomiasis control has been the emergence of drug-resistant parasites. Since the 1970's, praziquantel (PZQ) is the single drug for treatment. This fact highlights the importance to research news chemotherapeutic agents. In the last years, S. mansoni excretory system and tegument have been major targets for drug development. The purpose of this study was to evaluate the effect of sesquiterpenes, alpha-humulene and trans-caryophyllene on S. mansoni survival, excretory system and membrane integrity, after in vitro exposure...
April 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28437884/regulatory-role-of-mir-211-5p-in-hepatocellular-carcinoma-metastasis-by-targeting-zeb2
#8
Guangbin Jiang, Li Wen, Weiping Deng, Zhiyuan Jian, Hongmei Zheng
Hepatocellular carcinoma (HCC) is the most common type of cancer and the rapid tumor growth, drug resistance and metastasis are the major problems for HCC therapy. MicroRNAs (miRNAs) involve in various cell biological processes in HCC. ZEB2 plays crucial roles in HCC progression. ZEB2 is regulated by some identified miRNAs, but there needs to find new miRNAs regulating ZEB2 expression for better understanding the molecular mechanism of HCC. In the present study, ZEB2 was identified as a direct target of miR-211-5p, which was a potential oncogene in cancer...
April 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28437870/assessing-the-likelihood-and-magnitude-of-a-population-health-benefit-following-the-market-introduction-of-a-modified-risk-tobacco-product-enhancements-to-the-dynamic-population-modeler-dpm-1
#9
Annette M Bachand, Sandra I Sulsky, Geoffrey M Curtin
Researchers and those responsible for evaluating and implementing policies intended to reduce population harm must assess the potential for both intended and unintended consequences associated with those policies. Such assessments should be based on the combined dimensions of magnitude, and thus likelihood, of shifts in exposure patterns needed to produce a population benefit or harm, and magnitude of the expected population benefit or harm. In response to this assessment need, we provide a conceptual description of the dynamic population modeler, DPM(+1), as well as illustrative analyses that estimate the effects on all-cause mortality, life expectancy, and quality of life-adjusted life expectancy if exposure patterns in the population shift from a higher risk product (e...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437865/a-novel-role-of-astrocyte-elevated-gene-1-aeg-1-in-regulating-non-alcoholic-steatohepatitis-nash
#10
Jyoti Srivastava, Chadia L Robertson, Kareem Ebeid, Mikhail Dozmorov, Devaraja Rajasekaran, Rachel Mendoza, Ayesha Siddiq, Maaged A Akiel, Nidhi Jariwala, Xue-Ning Shen, Jolene J Windle, Mark A Subler, Nitai D Mukhopadhyay, Shah Giashuddin, Shobha Ghosh, Zhao Lai, Yidong Chen, Paul B Fisher, Aliasger K Salem, Arun J Sanyal, Devanand Sarkar
Nonalcoholic steatohepatitis (NASH) is the most prevalent cause of chronic liver disease in the Western world. However, an optimum therapy for NASH is yet to be established mandating more in-depth investigation into the molecular pathogenesis of NASH to identify novel regulatory molecules and develop targeted therapies. Here, we unravel a unique function of Astrocyte elevated gene-1/Metadherin (AEG-1/MTDH) in NASH using a transgenic mouse with hepatocyte-specific overexpression of AEG-1 (Alb/AEG-1) and a conditional hepatocyte-specific AEG-1 knockout mouse (AEG-1(ΔHEP) )...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28437863/sirt3-acts-as-a-negative-regulator-of-autophagy-dictating-hepatocyte-susceptibility-to-lipotoxicity
#11
Songtao Li, Xiaobing Dou, Hua Ning, Qing Song, Wei Wei, Ximei Zhang, Chen Shen, Jiaxin Li, Changhao Sun, Zhenyuan Song
Lipotoxicity induced by saturated fatty acids (SFAs) plays a central role in the pathogenesis of non-alcoholic fatty liver disease (NAFLD); however, the exact mechanism(s) remain to be fully elucidated. SIRT3 is an NAD(+) -dependent deacetylase primarily located inside mitochondria. In this study, we demonstrated that a SFAs-rich high-fat diet (HFD) was more detrimental to the liver than an isocaloric unsaturated FAs-rich HFD. Unexpectedly, SIRT3 expression/activity were significantly elevated in the livers of mice exposed to the SFAs-rich HFD...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28437859/multiple-sclerosis-broke-my-heart
#12
Géraldine Androdias, Emilien Bernard, Damien Biotti, Nicolas Collongues, Françoise Durand-Dubief, Julie Pique, Ingrid Sanchez, Clément Delmas, Jacques Ninet, Romain Marignier, Sandra Vukusic
We report 5 cases of acute heart failure (AHF) related to multiple sclerosis (MS) relapses. AHF was inaugural in 3 patients, always preceded or accompanied by signs of brainstem dysfunction; it was severe, requiring intensive care management. Echocardiography showed left ventricular hypokinesis. No other cause of AHF has been found. All patients showed a new medullary lesion on brain MRI. All had rapid and complete recovery of ventricular function after intravenous corticosteroids. We concluded to a takotsubo phenomenon...
April 24, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28437854/is-there-sufficient-evidence-for-a-causal-association-between-antiretroviral-therapy-and-diabetes-in-hiv-infected-patients-a-meta-analysis
#13
REVIEW
Chidozie U Nduka, Saverio Stranges, Peter K Kimani, Ahmed M Sarki, Olalekan A Uthman
BACKGROUND: The association of antiretroviral therapy (ART) with diabetes is inconsistent and varies widely across primary epidemiological studies. A comprehensive and more precise estimate of this association is fundamental to establishing a plausible causal link between ART and diabetes. METHODS: We identified epidemiological studies that compared mean fasting plasma glucose (FPG) concentrations and proportions of diabetes and metabolic syndrome between HIV-infected patients naïve and exposed to ART...
April 24, 2017: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/28437850/public-perception-of-uncertainties-within-climate-change-science
#14
Vivianne H M Visschers
Climate change is a complex, multifaceted problem involving various interacting systems and actors. Therefore, the intensities, locations, and timeframes of the consequences of climate change are hard to predict and cause uncertainties. Relatively little is known about how the public perceives this scientific uncertainty and how this relates to their concern about climate change. In this article, an online survey among 306 Swiss people is reported that investigated whether people differentiate between different types of uncertainty in climate change research...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437846/pain-sensitization-is-associated-with-disease-activity-in-rheumatoid-arthritis-patients-a-cross-sectional-study
#15
Yvonne C Lee, Clifton O Bingham, Robert R Edwards, Wendy Marder, Phillips Kristine, Marcy B Bolster, Daniel J Clauw, Larry W Moreland, Bing Lu, Alyssa Wohlfahrt, Zhi Zhang, Tuhina Neogi
OBJECTIVE: Pain sensitization may contribute to pain severity in rheumatoid arthritis (RA), impacting assessment of disease activity. We examined whether pain processing mechanisms were associated with disease activity among RA patients with active disease. METHODS: This study includes 139 subjects enrolled in the Central Pain in Rheumatoid Arthritis cohort. Subjects underwent quantitative sensory testing (QST), including assessment of pressure pain thresholds (PPTs) at multiple sites, conditioned pain modulation, and temporal summation...
April 24, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28437835/pten-downregulation-promotes-%C3%AE-oxidation-to-fuel-hypertrophic-liver-growth-after-hepatectomy-in-mice
#16
Ekaterina Kachaylo, Christoph Tschuor, Nicolas Calo, Nathalie Borgeaud, Perparim Limani, Anne-Christine Piguet, Jean-Francois Dufour, Michelangelo Foti, Rolf Graf, Pierre A Clavien, Bostjan Humar
In regenerating liver, hepatocytes accumulate lipids before the major wave of parenchymal growth. This transient, regeneration-associated steatosis (TRAS) is required for liver recovery, but its purpose is unclear. The tumor suppressor PTEN is a key inhibitor of the AKT-mTOR axis that regulates growth and metabolic adaptations after hepatectomy. In quiescent liver, PTEN causes pathological steatosis when lost, while its role in regenerating liver remains unknown. Here, we show that PTEN downregulation promotes liver growth in a TRAS-dependent way...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28437823/-medicolegal-assessment-of-psychic-sequelae-after-minor-traumatic-events
#17
Bernhard Widder
The majority of medicolegal assessments in claimed psychic sequelae after accidents concerns minor traumatic events. In this case, the focus is on three questions: Was the event appropriate to cause a traumatic disturbance according to current psychiatric classification systems (especially current DSM-5)? Which psychical or physical initial injury can be proven beyond reasonable doubt ("full proof") according to German law? What is the impact of personality characteristics and competing life events in the development and maintenance of the mental disorder? Causality between mental disorders and minor traumatic events is to be confirmed especially in the case of persistent physical accident sequelae, but attention has to be paid to the differences in the various legal requirements...
April 2017: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/28437822/osmotic-demyelination-syndrome-due-to-severe-hyponatremia-mimicking-hypoxic-encephalopathy
#18
Felix Wicke, Sasha Moreitz, Stefan Weidauer
Hyponatremia and its rapid correction is a well-known cause of osmotic demyelination most commonly affecting the pons. We report on a case of severe hyponatremia likely due to psychogenic polydipsia resulting in hypotonic hyperhydration with resulting cortical laminar necrosis on initial imaging, mimicking hypoxic brain damage. Pontine myelinolysis became apparent on follow-up imaging, illustrating the diagnostic challenges of extrapontine manifestations of severe hyponatremia.
April 2017: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/28437813/presenting-symptoms-of-pituitary-apoplexy
#19
Efstratios-Stylianos Pyrgelis, Ioannis Mavridis, Maria Meliou
The classical term "pituitary apoplexy" (PA) describes a clinical syndrome usually characterized by abrupt onset of headache accompanied by neurologic and/or endocrinologic deterioration due to sudden expansion of a mass within the sella turcica as a result of hemorrhage or infarction within a pituitary tumor and adjacent pituitary gland. PA is a medical emergency and a difficult diagnosis to establish. Thus this article reviews the presenting symptoms of PA patients to help clinicians recognize or at least suspect this critical condition early on...
April 24, 2017: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28437810/hyperprolactinemia-and-the-association-with-all-cause-mortality-and-cardiovascular-mortality
#20
Jesper Krogh, Christian Selmer, Christian Torp-Pedersen, Gunnar Hilmar Gislason, Caroline Kistorp
Hyperprolactinemia has been suspected to increase mortality risk, but the available data are conflicting. The objective of this study was to estimate the association between hyperprolactinemia and all-cause and cardiovascular mortality among patients referred for assessment of prolactin. For this study, adults with no prio pituitary disease who underwent prolactin assessment at 3 university Hospitals in Denmark between 2001 and 2011 were included in a retrospective cohort study. A total of 3 633 patients with a median follow-up time of 5...
April 24, 2017: Hormone and Metabolic Research, Hormon- und Stoffwechselforschung, Hormones et Métabolisme
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