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Kyeongjun Lee, Chowee Park, Yeonsoo Oh, Heesoon Lee, Jungsook Cho
Excitotoxicity and oxidative stress play vital roles in the development of neurodegenerative disorders including Alzheimer's disease (AD). In the present study, we investigated the effect of N -((3,4-dihydro-2H-benzo[h]chromen-2-yl)methyl)-4-methoxyaniline (BL-M) on excitotoxic neuronal cell damage in primary cultured rat cortical cells, and compared to that of memantine, a non-competitive N -methyl-d-aspartate (NMDA) receptor antagonist clinically used to treat AD. We found that BL-M inhibited glutamate- or N -methyl-d-aspartate (NMDA)-induced excitotoxic cell damage...
March 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Min Xu, Shulai Lei, Jing Qi, Qingyun Dou, Lingyang Liu, Yulan Lu, Qing Huang, Siqi Shi, Xingbin Yan
Two-dimensional (2D) Ti3C2 MXene has attracted great attention in electrochemical energy storage devices (supercapacitors, lithium-ion and sodium-ion batteries) due to its excellent electrical conductivity as well as high volumetric capacity. Nevertheless, existing study showed that multivalent Mg2+ ions cannot reversibly insert into MXene, resulting in a negligible capacity. Here we demonstrate a simple strategy to achieve high magnesium storage capability for Ti3C2 MXene by pre-intercalating a cationic surfactant cetyltrimethylammonium bromide (CTAB)...
March 15, 2018: ACS Nano
Michael Hart
Daytime use of adaptive optics (AO) at large telescopes is hampered by shot noise from the bright sky background. Wave-front sensing may use a sodium laser guide star observed through a magneto-optical filter to suppress the background, but the laser beacon is not sensitive to overall image motion. To estimate that, laser-guided AO systems generally rely on light from the object itself, collected through the full aperture of the telescope. Daylight sets a lower limit to the brightness of an object that may be tracked at rates sufficient to overcome the image jitter...
March 15, 2018: Optics Letters
John W Garrett, Yinsheng Li, Ke Li, Guang-Hong Chen
PURPOSE: Digital breast tomosynthesis (DBT) has been shown to somewhat alleviate the breast tissue overlapping issues of two dimensional (2D) mammography.However, the improvement in current DBT systems over mammography is still limited.Statistical image reconstruction (SIR) methods have the potential to reduce through-plane artifacts in DBT, and thus may be used to further reduce anatomical clutter. The purpose of this work was to study the impact of SIR on anatomical clutter in the reconstructed DBT image volumes...
March 15, 2018: Medical Physics
M R Kholghy, G A Kelesidis, S E Pratsinis
Nucleation is an important, yet poorly understood step in soot formation. Here, the importance of reactive PAH dimerization in reducing soot nucleation reversibility is investigated by simulating soot formation in a so-called "nucleation" flame (P. Desgroux et al., Combust. Flame, 2017, 184, 153-166). There, inception of soot particles is prolonged at minimal subsequent growth. With only reversible PAH dimerization, the simulated soot concentration is negligible. Accounting however for PAH chemical bond formation after physical dimerization, stabilizes dimers by covalent bonds and increases the soot concentration by four orders of magnitude, in good agreement with Laser Induced Incandescence measurements...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Kentaro Teramura, Tsunehiro Tanaka
Artificial photosynthesis has recently drawn an increasing amount of attention due to the fact that it allows for direct solar-to-chemical energy conversion. However, one of the basic steps of this process, namely the reduction of CO2 by H2 O to afford O2 and CO2 reduction products (CO2 RPs) such as HCOOH, CO, HCHO, CH3 OH, and CH4 , is very difficult to achieve. In contrast to the CO2 reduction in plants and homogenous systems, the reduction of CO2 to CO2 RPs over heterogeneous photocatalysts was challenged by the competing reduction of H+ to H2 ...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Jie Zhu, Hao Chen, Zhixiu Song, Xudong Wang, Zhenshuang Sun
Objective: This article aims to assess the effects of ginger (Zingiber officinale Roscoe) on type 2 diabetes mellitus (T2DM) and/or components of the metabolic syndrome (MetS). Methods: Electronic literature was searched in PubMed, Embase, the Cochrane Library, Chinese Biomedical Database, China National Knowledge Infrastructure, and Wanfang Database from inception of the database to May 19, 2017, and supplemented by browsing reference lists of potentially eligible articles...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
Johann Bartko, Christian Schoergenhofer, Michael Schwameis, Patricia Wadowski, Jacek Kubica, Bernd Jilma, Eva-Luise Hobl
Aspirin is a cornerstone in the anti-platelet therapy of acute coronary syndromes. Co-administration of morphine may potentially influence the intestinal absorption, pharmacokinetics and pharmacodynamics as seen with P2Y12-inhibitors. In this trial, healthy volunteers were randomized to receive morphine (5 mg, iv bolus injection) at one of 7 different time points before, after or with aspirin (162 mg, po) in a double-blind, placebo controlled fashion. After a 14-day washout, subjects received placebo instead of morphine...
March 14, 2018: Journal of Pharmacology and Experimental Therapeutics
Angelo Forli, Dania Vecchia, Noemi Binini, Francesca Succol, Serena Bovetti, Claudio Moretti, Francesco Nespoli, Mathias Mahn, Christopher A Baker, McLean M Bolton, Ofer Yizhar, Tommaso Fellin
Sensory information is encoded within the brain in distributed spatiotemporal patterns of neuronal activity. Understanding how these patterns influence behavior requires a method to measure and to bidirectionally perturb with high spatial resolution the activity of the multiple neuronal cell types engaged in sensory processing. Here, we combined two-photon holography to stimulate neurons expressing blue light-sensitive opsins (ChR2 and GtACR2) with two-photon imaging of the red-shifted indicator jRCaMP1a in the mouse neocortex in vivo...
March 13, 2018: Cell Reports
Mery Natali Silva Abreu, Angela Deise Soares, Diemack Alle Oliveira Ramos, Fernanda Vieira Soares, Gerson Nunes Filho, Analina Furtado Valadão, Patrícia Gonçalves da Motta
Several studies have identified misconceptions about human papillomavirus (HPV), which can lead to negligent behavior and risk to the health of the population. This article aims to assess the knowledge of men and women about HPV in the city of Ipatinga, Minas Gerais, and evaluate socioeconomic factors and preventive measures associated with such knowledge. It involved a cross-sectional study with 591 subjects living in the city, by means of stratified sampling by quotas proportional to the number of individuals by sex and age in each of the eight administrative regions of the city...
March 2018: Ciência & Saúde Coletiva
Filip Boratyński, Ewa Szczepańska, Aleksandra Grudniewska, Bartłomiej Skalny, Teresa Olejniczak
In this study, solid-state fermentation (SSF) was proposed as an alternative approach to obtain optically pure forms of one of the most common aroma compounds, whisky lactone. Filamentous fungi were used for enantioselective hydrolysis of a racemate of trans and cis whisky lactones, utilizing rapeseed cake as a growth medium. Among the tested fungi, Fusarium oxysporum AM13 and Papularia rosea AM17 were chosen for further studies. Various process parameters, including temperature, moisture content of solid media, and substrate concentration were optimized to maximize the efficiency of the kinetic resolution process...
March 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Francesco Plotti, Corrado Terranova, Stella Capriglione, Stefania Crispino, Alessandra Li Pomi, Carlo de Cicco Nardone, Roberto Montera, Pierluigi Benedetti Panici, Roberto Angioli, Giuseppe Scaletta
AIMS: The aim of this study was to evaluate long-term quality of life and urinary and sexual function in long-term cervical cancer survivors previously treated with radical hysterectomy (RH) type C2/type III. METHODS: All patients who presented at Campus Bio-Medico of Rome for RH type C2/type III for cervical cancer were considered eligible for this retrospective study protocol. We included exclusively patients with complete response to primary treatment with at least 36 months of follow up...
March 14, 2018: International Journal of Gynecological Cancer
Silvia Ravera, Maria Grazia Signorello, Martina Bartolucci, Sara Ferrando, Lucia Manni, Federico Caicci, Daniela Calzia, Isabella Panfoli, Alessandro Morelli, Giuliana Leoncini
BACKGROUND INFORMATION: Energy demand in human platelets is very high, to carry out their functions. As for most human cells, the aerobic metabolism represents the primary energy source in platelets, even though mitochondria are negligibly represented. Following the hypothesis that other structures could be involved in chemical energy production, in this work, we have investigated the functional expression of an extramitochondrial aerobic metabolism in platelets. RESULTS: Oximetric and luminometric analyses showed that platelets consume large amounts of oxygen and produce ATP in the presence of common respiring substrates, such as pyruvate + malate or succinate, although morphological electron microscopy analysis showed that these contain few mitochondria...
March 14, 2018: Biology of the Cell
Mao Li, Stefanie Mosel, Shirley K Knauer, Carsten Schmuck
Herein, we report a rather simple strategy to enhance the anion binding ability of a dipeptide to achieve cell uptake and also protein delivery. Peptide 1, composed of only two synthetic amino acids with an artificial anion binding site in the side chains, has an overall molecular weight of only 630 Da and demonstrated strong binding affinity (107 M-1 ) and clustering ability with heparin as a model for cell surface sugars. Furthermore, peptide 1 is also efficiently taken up by cells most likely via endocytosis...
March 14, 2018: Organic & Biomolecular Chemistry
Leonard Berlin
For the first 180 years following the founding of the US, physicians occasionally were sued for medical malpractice. Allegations of negligence were errors of commission - i.e. the physician made a mistake by doing something wrong, usually mistreatment of a fracture or dislocation, a complication or death following a surgical procedure, prescribing the wrong medication, and after the discovery of the X-ray by Roentgen in 1895, causing radiation burns. In the mid twentieth century malpractice allegations slowly changed from errors of commission to errors of omission - i...
September 26, 2017: Diagnosis
Rong Wang, Lei Cao, Zhenxing Shen, Yongxiao Cao
Fine particle matters (PM2.5 ) is a well-known risk factor for cardiovascular diseases. However, the underlying molecular mechanisms are largely unknown. Vascular hyper-reactivity plays an important roles in the pathogenesis of cardiovascular diseases. The present study was designed to investigate a hypothesis that PM2.5 up-regulated endothelin receptors in mesenteric artery and the potential underlying mechanisms. Rat mesenteric arteries were cultured with PM2.5 . The artery contractile responses were recorded by a sensitive myograph...
March 13, 2018: Environmental Science and Pollution Research International
John T Van Stan, Dennis A Gordon
Stemflow, a precipitation and solute supply to soils near tree stems, can play a wide array of roles in ecosystem functioning. However, stemflow's ecohydrological functions have been primarily studied in forests with voluminous stemflow because resource subsidy is currently considered stemflow's only impact on near-stem soils. This common assumption ignores controls that stemflow generation may exert via resource limitation (when stemflow < open rainfall and near-stem throughfall is negligible). We reviewed selected literature across numerous forests to evaluate the predominance of stemflow as a potential resource limitation to near-stem soils and characterized the concentrated, but meager, solute flux from low stemflow generators...
2018: Frontiers in Plant Science
Wei Huang, Ying-Jie Yang, Shi-Bao Zhang, Tao Liu
In higher plants, moderate photoinhibition of photosystem II (PSII) leads to a stimulation of cyclic electron flow (CEF) at low light, which is accompanied by an increase in the P700 oxidation ratio. However, the specific role of CEF stimulation at low light is not well known. Furthermore, the mechanism underlying this increase in P700 oxidation ratio at low light is unclear. To address these questions, intact leaves of the shade-adapted plant Panax notoginseng were treated at 2258 μmol photons m-2 s-1 for 30 min to induce PSII photoinhibition...
2018: Frontiers in Plant Science
Bjørg Y Aksnessæther, Arne Solberg, Olbjørn H Klepp, Tor Åge Myklebust, Eva Skovlund, Solveig Roth Hoff, Lars J Vatten, Jo-Åsmund Lund
PURPOSE: Prostate cancer (PC) patients who undergo antiandrogen monotherapy are offered prophylactic radiation therapy (PRT) to the breast buds to avoid gynecomastia. The aim of the present study was to evaluate whether the risk of breast cancer (BC) in men with PC as their first cancer diagnosis was influenced by PRT. METHODS AND MATERIALS: From the Norwegian Cancer Registry, we collected data from all patients with PC as their first cancer diagnosis from 1997 to 2014...
February 5, 2018: International Journal of Radiation Oncology, Biology, Physics
Justyna Aszyk, Paweł Kubica, Mateusz Kacper Woźniak, Jacek Namieśnik, Andrzej Wasik, Agata Kot-Wasik
Many flavour compounds that are present in e-liquids for e-cigarettes are responsible for specific tastes and smoking sensations for users. Data concerning content and specific types of flavours is often limited and unknown to users. The aim of the research was to define and compare flavour profiles of e-liquids with the same group taste from different manufacturers. Gas chromatography coupled with tandem mass spectrometry (GC-MS/MS) was used to separate and identify 90 popular compounds (98, including isomers) of interest...
March 5, 2018: Journal of Chromatography. A
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