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https://www.readbyqxmd.com/read/28823089/study-of-photophysical-properties-on-newly-synthesized-coumarin-derivatives
#1
Ashok H Sidarai, Vani R Desai, Shirajahammad M Hunagund, Mahantesha Basanagouda, Jagadish S Kadadevarmath
Herein, we have studied the photophysical properties for three newly synthesized coumarin derivatives; 4-((2,6-dibromo-4-methylphenoxy)methyl)-2H-benzo[h]chromen-2-one (DMB), 4-((3,4-dihydro-6,7-dimethoxyisoquinolin-1-yl)methyl)-6-methyl-2H-chromen-2-one (DIM) and 4-((p-tolyloxy)methyl)-6-methoxy-2H-chromen-2-one (TMC). The absorption and emission spectra for above said molecules were recorded in different solvents at room temperature in order to calculate their ground and excited state dipole moments. The ground (μ g ) and excited state dipole (μ e ) moments of these coumarin derivatives were calculated using Lippert's, Bakshiev's and Kawski-Chamma-Viallet's equations by the solvatochromic shift method, which involves a variation of Stokes shift with the solvent dielectric constant and refractive index...
August 19, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28822859/a-facile-method-to-prepare-green-nano-phosphors-with-a-large-stokes-shift-and-solid-state-enhanced-photophysical-properties-based-on-surface-modified-gold-nanoclusters
#2
C H Cheng, H Y Huang, M J Talite, W C Chou, J M Yeh, C T Yuan
Colloidal nano-materials, such as quantum dots (QDs) have been applied to light-conversion nano-phosphors due to their unique tunable emission. However, most of the QDs involve toxic elements and are synthesized in a hazardous solvent. In addition, conventional QD nano-phosphors with a small Stokes shift suffered from reabsorption losses and aggregation-induced quenching in the solid state. Here, we demonstrate a facile, matrix-free method to prepare eco-friendly nano-phosphors with a large Stokes shift based on aqueous thiolate-stabilized gold nanoclusters (GSH-AuNCs) with simple surface modifications...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28822082/a-linear-ion-trap-with-an-expanded-inscribed-diameter-to-improve-optical-access-for-fluorescence-spectroscopy
#3
Vaishnavi Rajagopal, Chris Stokes, Alessandra Ferzoco
We report a custom-geometry linear ion trap designed for fluorescence spectroscopy of gas-phase ions at ambient to cryogenic temperatures. Laser-induced fluorescence from trapped ions is collected from between the trapping rods, orthogonal to the excitation laser that runs along the axis of the linear ion trap. To increase optical access to the ion cloud, the diameter of the round trapping rods is 80% of the inscribed diameter, rather than the roughly 110% used to approximate purely quadrupolar electric fields...
August 18, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28821843/broadband-polarization-conversion-with-anisotropic-plasmonic-metasurfaces
#4
Wei Cao, Xiaodong Yang, Jie Gao
Metasurfaces offer exciting opportunities that enable precise control of light propagation, optical intensity, phase and polarization. Plasmonic metasurface based quarter-wave plates have been recently studied to realize the conversion between linear polarization and circular polarization. However, it is still quite challenging to directly measure the birefringent phase retardation introduced by metasurface wave plates with a reliable technique. Here, we report a high-performance broadband metasurface quarter-wave plate made of anisotropic T-shaped plasmonic antennas in near-infrared wavelength range, where the achromatic nearly 90° transmitted phase retardation through the metasurface is precisely characterized with an optical vortex based interferometric approach...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821608/the-transmembrane-domain-of-the-p75-neurotrophin-receptor-stimulates-phosphorylation-of-the-trkb-tyrosine-kinase-receptor
#5
Khalil Saadipour, Michael MacLean, Sean Pirkle, Solav Ali, Maria Luisa Lopez-Redondo, David L Stokes, Moses V Chao
The function of protein products generated from intramembraneous cleavage by the γ-secretase complex is not well defined. The γ-secretase complex is responsible for the cleavage of several transmembrane proteins, most notably the amyloid precursor protein which results in Aβ, a transmembrane (TM) peptide. Another protein that undergoes a very similar γ-secretase cleavage is the p75 neurotrophin receptor. However, the fate of the cleaved p75 TM domain is unknown. p75 neurotrophin receptor is highly expressed during early neuronal development and regulates survival and process formation of neurons...
August 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28820263/hydrodynamic-steering-in-protein-association-revisited-surprisingly-minuscule-effects-of-considerable-torques
#6
Jan Marek Antosiewicz, Kamil Kamiński, Maciej Dlugosz
We investigate the previously postulated hydrodynamic steering phenomenon, resulting from complication of molecular shapes, its magnitude and possible relevance for protein-ligand and protein-protein diffusional encounters, and the kinetics of diffusion-controlled association. We consider effects of hydrodynamic interactions in a prototypical model system consisting of a cleft enzyme and an elongated substrate, and real protein-protein complexes, that of barnase and barstar, and human growth hormone and its binding protein...
August 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28819980/superior-fluorogen-activating-protein-probes-based-on-3-indole-malachite-green
#7
Qingyang Zhang, Qinghua Wang, Ying Sun, Limin Zuo, Verena Fetz, Hai-Yu Hu
A series of novel fluorogenic dyes based on 3-indole-Malachite Green, MGs 5-7, have been developed that are dark in solution but highly fluorescent when bound to the cognate reporter, fluorogen-activating protein (FAP). Significantly, the new MGs 5-7 probes are superior to the traditional MG 1 with high fluorescent efficiency and low toxicity to cells while maintaining the large "pseudo-Stokes" shifts (Δλ = λex - λem) and the malachite green (MG)-like fluorescence OFF-ON switching mechanism in both live mammalian cells and bacterial cells when bound to FAP...
August 18, 2017: Organic Letters
https://www.readbyqxmd.com/read/28818553/the-training-and-creativity-of-professional-chefs-stoking-the-imagination-in-global-gastronomic-field
#8
Leo Pang
The sameness of eating out has been criticised in some quarters of food media in recent years. In this paper I demonstrate through the case of three chefs in Hong Kong how this sameness is the product of global gastronomic field. I suggest that chefs play a crucial role in providing the content that fuels gastronomic discourses and also in delivering the experiences of the discourse on the plate to diners. The experience of chefs with cuisines such as Thai, Vietnamese and Spanish allows them to prepare dishes that attract plaudits from food media and fuel the imagination of potential diners...
August 14, 2017: Appetite
https://www.readbyqxmd.com/read/28818266/microrna-93-elevation-after-myocardial-infarction-is-cardiac-protective
#9
Kai Li, Tao Lin, Lingdan Chen, Neng Wang
Coronary Artery Disease (CAD) is one of the most serious diseases that endangers human health worldwide, myocardial infarction (MI) is an acute form of CAD. Recent developments in MI therapies have resulted in significant reductions in mortality. However, subsequent chronic congestive heart failure and ventricle remodeling plagues an increasing number of MI patients. MicroRNAs (miR) have been reported to be involved in the process of cardiac remodeling, a recent study shows that miR-93 is elevated in the blood of CAD patients...
September 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28816988/relationship-between-serum-adipokine-levels-and-radiographic-progression-in-patients-with-ankylosing-spondylitis-a-preliminary-2-year-longitudinal-study
#10
Ji-Heh Park, Seung-Geun Lee, Yun-Kyung Jeon, Eun-Kyoung Park, Young-Sun Suh, Hyun-Ok Kim
The immunomodulatory effects of adipokines have been extensively studied in rheumatic diseases, and there is a paucity of information regarding their effects on bone metabolism.The aim of this study was to investigate the relationships between serum adipokines levels and radiographic progression over 2 years in patients with ankylosing spondylitis (AS).In this preliminary longitudinal study, we prospectively recruited 20 consecutive male patients with AS and 11 gender- and age-matched healthy subjects. At the baseline and 2-year follow-up, serum adiponectin, leptin, resistin, tumor necrosis factor-alpha (TNF-α), interleukin (IL)-6, and Dickkopf-1(DKK-1) levels were measured in AS patients using enzyme-linked immunosorbent assays; these measurements were only performed at the baseline for healthy controls...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28816476/benefits-of-flexible-prioritization-in-working-memory-can-arise-without-costs
#11
Nicholas E Myers, Sammi R Chekroud, Mark G Stokes, Anna C Nobre
Most recent models conceptualize working memory (WM) as a continuous resource, divided up according to task demands. When an increasing number of items need to be remembered, each item receives a smaller chunk of the memory resource. These models predict that the allocation of attention to high-priority WM items during the retention interval should be a zero-sum game: improvements in remembering cued items come at the expense of uncued items because resources are dynamically transferred from uncued to cued representations...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28813607/nonlinear-raman-effects-enhanced-by-surface-plasmon-excitation-in-planar-refractory-nano-antennas
#12
Sergey S Kharintsev, Anton Kharitonov, Semion Saikin, Alexander M Alekseev, Sergei G Kazarian
We consider a nonlinear mechanism of localized light inelastic scattering within nano-patterned plasmonic and Raman-active titanium nitride (TiN) thin films exposed to continuous-wave (cw) modest-power laser light. Owing to the strong third-order nonlinear interaction between optically excited broadband surface plasmons and localized Stokes and anti-Stokes waves, both stimulated and inverse Raman effects can be observed. We provide experimental evidences for coherent amplification of the localized Raman signals using a planar square shaped refractory antenna...
August 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28810926/the-association-between-sonographic-enthesitis-and-radiographic-damage-in-psoriatic-arthritis
#13
Ari Polachek, Richard Cook, Vinod Chandran, Dafna D Gladman, Lihi Eder
BACKGROUND: To examine the association between sonographic enthesitis and the severity of radiographic features of damage in the peripheral and axial joints in psoriatic arthritis (PsA). METHODS: A cross-sectional analysis was conducted in patients with PsA. The MAdrid Sonography Enthesitis Index (MASEI) scoring system was used to quantify the extent of sonographic entheseal abnormalities. Radiographic damage in the peripheral joints and spine was assessed by the modified Steinbrocker score (mSS), Modified New York Criteria for sacroiliitis, and the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS)...
August 15, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28809496/time-resolved-coherent-anti-stokes-raman-scattering-of-graphene-dephasing-dynamics-of-optical-phonon
#14
Juha Koivistoinen, Pasi Myllyperkiö, Mika Pettersson
We report dynamics of the G-mode in graphene probed with time-resolved coherent anti-Stokes Raman scattering measurements. By applying BOXCARS excitation geometry with three different excitation wavelengths, various nonlinear processes can be selectively detected due to energy and momentum conservation and temporal sequence of the pulses. The Raman signal due to resonant coherent excitation of the G-mode shows exponential decay with lifetime of ∼325 ± 50 fs. This decay time is shorter than expected based on the line width of the G-mode in the Raman spectrum...
August 18, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28808861/epidemiology-of-sleep-disordered-breathing-and-heart-failure-what-drives-what
#15
REVIEW
Sushma M Dharia, Lee K Brown
PURPOSE OF REVIEW: The bidirectional relationships that have been demonstrated between heart failure (HF) and central sleep apnea (CSA) demand further exploration with respect to the implications that each condition has for the other. This review discusses the body of literature that has accumulated on these relationships and how CSA and its potential treatment may affect outcomes in patients with CSA. RECENT FINDINGS: Obstructive sleep apnea (OSA) can exacerbate hypertension, type 2 diabetes, obesity, and atherosclerosis, which are known predicates of HF...
August 14, 2017: Current Heart Failure Reports
https://www.readbyqxmd.com/read/28808428/a-comparison-of-concurrent-cisplatin-versus-cetuximab-with-radiotherapy-in-locally-advanced-head-and-neck-cancer-a-bi-institutional-analysis
#16
William A Stokes, Whitney A Sumner, Kiersten L Breggren, John T Rathbun, David Raben, Jessica D McDermott, Gregory Gan, Sana D Karam
AIM: To present our experience comparing cisplatin- and cetuximab-based radiotherapy for locally-advanced head and neck squamous cell carcinoma. BACKGROUND: The comparative effectiveness of cisplatin-based chemoradiotherapy (CRT) versus cetuximab-based bioradiotherapy (BRT) for locally-advanced head and neck squamous cell carcinoma (LAHNSCC) continues to be explored. MATERIALS AND METHODS: Outcomes of LAHNSCC patients treated with CRT (125) or BRT (34) at two institutions were compared retrospectively, with attention to overall survival (OS), cancer-specific survival (CSS), locoregional control (LRC), and distant control (DC)...
September 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/28805107/effects-of-high-frequency-repetitive-transcranial-magnetic-stimulation-on-reducing-hemiplegic-shoulder-pain-in-patients-with-chronic-stoke-a-randomized-controlled-trial
#17
Gyu-Sik Choi, Min Cheol Chang
OBJECTIVE: To examine whether high-frequency (10 Hz) repetitive transcranial magnetic stimulation (rTMS), applied over the primary motor cortex of the affected hemisphere, could be used to manage hemiplegic shoulder pain (HSP). METHODS: Twenty-four chronic stroke patients with chronic HSP, randomly assigned into the rTMS group (10 sessions of high-frequency stimulation) or the sham group (sham stimulation), was performed. The Numeric Rating Scale (NRS) was used to evaluate the intensity of pain at pre-treatment, and at one day, and one, two, and four weeks after treatment...
August 12, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28800080/h%C3%A2-s-mediated-protein-s-sulfhydration-a-prediction-for-its-formation-and-regulation
#18
REVIEW
Youngjun Ju, Ming Fu, Eric Stokes, Lingyun Wu, Guangdong Yang
Protein S-sulfhydration is a newly discovered post-translational modification of specific cysteine residue(s) in target proteins, which is involved in a broad range of cellular functions and metabolic pathways. By changing local conformation and the final activity of target proteins, S-sulfhydration is believed to mediate most cellular responses initiated by H₂S, a novel gasotransmitter. In comparison to protein S-sulfhydration, nitric oxide-mediated protein S-nitrosylation has been extensively investigated, including its formation, regulation, transfer and metabolism...
August 11, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28797765/patterns-of-fractionation-and-boost-usage-in-adjuvant-external-beam-radiotherapy-for-ductal-carcinoma-in-situ-in-the-united-states
#19
William A Stokes, Arya Amini, Matthew W Jackson, S Reed Plimpton, Nicole Kounalakis, Peter Kabos, Rachel A Rabinovitch, Chad G Rusthoven, Christine M Fisher
BACKGROUND: While the roles of hypofractionated (HFxn) radiotherapy and lumpectomy boost in the adjuvant management of invasive breast cancer are supported by the results of clinical trials, randomized data supporting their use for ductal carcinoma in situ (DCIS) are forthcoming. We sought to evaluate current national trends and identify factors associated with HFxn and boost usage using the National Cancer Database. PATIENTS AND METHODS: We queried the National Cancer Database for women diagnosed with DCIS from 2004 to 2014 undergoing external beam radiotherapy after breast conservation surgery...
June 29, 2017: Clinical Breast Cancer
https://www.readbyqxmd.com/read/28797446/patterns-of-fractionation-for-patients-with-t2n0m0-glottic-larynx-cancer-undergoing-definitive-radiotherapy-in-the-united-states
#20
William A Stokes, Priscilla K Stumpf, Bernard L Jones, Patrick J Blatchford, Sana D Karam, Ryan M Lanning, David Raben
OBJECTIVES: Among patients with T2N0M0 glottic larynx cancer undergoing definitive radiotherapy, recent retrospective and prospective data have suggested improved outcomes with altered fractionation over conventional fractionation (CFxn). We sought to characterize national fractionation patterns and to compare outcomes among them. MATERIALS AND METHODS: We queried the National Cancer Database for T2N0M0 squamous cell carcinomas of the glottis diagnosed from 2004-2014 and managed with definitive radiotherapy...
September 2017: Oral Oncology
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