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https://www.readbyqxmd.com/read/28318261/expanded-rosarin-a-versatile-fullerene-c60-receptor
#1
Xian-Sheng Ke, Taeyeon Kim, James T Brewster, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
An expanded rosarian (P3P6) with a bowl-like conformation has been prepared and characterized. It is prepared in a one pot procedure that involves condensing a bispyrrole pyridine precursor (P1P2) with benzaldehyde, followed by oxidation. Single crystal X-ray diffraction analysis reveals a bowl-like conformation in the solid state with an upper rim diameter defined by the meso-phenyl substituents of ca. 13.5 Å and a depth of roughly 6.3 Å. P3P6 forms both 1:1 and 2:1 complexes with C60 in the solid state...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28244933/prospective-cohort-comparison-of-visual-acuity-and-contrast-sensitivity-between-femto-laser-in-situ-keratomileusis-and-orthokeratology-for-low-to-moderate-myopia
#2
Mingxia Tian, Ping Ma, Guoying Mu
PURPOSE: To compare the visual acuity and contrast sensitivity (CS) after femto laser in situ keratomileusis (fLASIK) and orthokeratology (OK) in patients with low-to-moderate myopia. METHODS: A total of 68 patients were enrolled in this prospective cohort study. Of these, 40 eyes from 40 patients with low-to-moderate myopia underwent fLASIK and 28 eyes from 28 patients underwent OK. In addition to uncorrected distance visual acuity and corrected distance visual acuity, photopic and mesopic CS (with CSV-1000E) were tested before treatment and at 1, 3, and 6 months after treatment...
February 27, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28176376/thermodynamics-and-photodynamics-of-a-monoprotonated-porphyrin-directly-stabilized-by-hydrogen-bonding-with-polar-protic-solvents
#3
Takahiko Kojima, Wataru Suzuki, Hiroaki Kotani, Tomoya Ishizuka, Kei Ohkubo, Yoshihito Shiota, Kazunari Yoshizawa, Shunichi Fukuzumi
Addition of 1 equiv of TFA to an acetone solution containing dodecaphenylporphyrin (H2DPP) in the presence of 10% MeOH (v/v) resulted in selective formation of a monoprotonated form (H3DPP+), in sharp contrast to protonation of H2DPP directly affording a diprotonated form (H4DPP2+) in acetone in the absence of MeOH. The crucial role of MeOH for the selective H3DPP+ formation was interpreted as hydrogen-bonding stabilization of H3DPP+, since a MeOH molecule was found to form hydrogen bonding with an NH proton of H3DPP+ in the crystal...
February 7, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28135746/-smile-re-treatment-options-techniques-and-results
#4
B Meyer, K S Kunert
With a rate of less than 2 %, retreatment after SMILE is rare. If a touch-up is required, there are different options to choose from: surface ablation (PRK/LASEK) with Mitomycin C, the standard femto-flap procedure with the same parameters, the CIRCLE procedure, which extends the previous SMILE interface into a flap, or the innovative but off-label capless SMILE procedure, which preserves all the advantages of SMILE.
January 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28059773/attosecond-physics-at-the-nanoscale
#5
M F Ciappina, J A Pérez-Hernández, A S Landsman, W A Okell, S Zherebtsov, B Förg, J Schötz, L Seiffert, T Fennel, T Shaaran, T Zimmermann, A Chacón, R Guichard, A Zaïr, J W G Tisch, J P Marangos, T Witting, A Braun, S A Maier, L Roso, M Krüger, P Hommelhoff, M F Kling, F Krausz, M Lewenstein
Recently two emerging areas of research, attosecond and nanoscale physics, have started to come together. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, with duration on the femto- and sub-femtosecond time scales, interact with atoms, molecules or solids. The laser-induced electron dynamics occurs natively on a timescale down to a few hundred or even tens of attoseconds (1 attosecond  =  1 as  =  10(-18) s), which is comparable with the optical field. For comparison, the revolution of an electron on a 1s orbital of a hydrogen atom is  ∼152 as...
January 6, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28009886/primary-photophysical-and-photochemical-processes-for-hexachloroosmate-iv-in-aqueous-solution
#6
Evgeni M Glebov, Ivan P Pozdnyakov, Svetlana G Matveeva, Alexei A Melnikov, Sergey V Chekalin, Marina V Rogozina, Vladislav V Yudanov, Vjacheslav P Grivin, Victor F Plyusnin
The photoaquation of the Os(IV)Cl6(2-) complex was studied by means of stationary photolysis, nanosecond laser flash photolysis and ultrafast kinetic spectroscopy. The Os(IV)Cl5(OH)(2-) complex was found to be the only reaction product. The quantum yield of photoaquation is rather low and wavelength-dependent. No impact of redox processes on photoaquation was revealed. The total characteristic lifetime of the process is about 80 ps. Three intermediates were recorded in the femto- and picosecond time domains and assigned to different Os(iv) species...
December 22, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28006678/rapid-and-sensitive-detection-of-bisphenol-a-from-serum-matrix
#7
Xiaogang Lin, Cheng Cheng, Paul Terry, Jiangang Chen, Haochen Cui, Jayne Wu
Bisphenol A (BPA) is an endocrine disrupting compound that may have adverse developmental, reproductive, neurological, and immune system effects. Low-level exposure to BPA is ubiquitous in human populations due to its widespread use in consumer products. Therefore, highly sensitive methods are needed to quantify BPA in various matrices including water, serum, and food products. In this study, we developed a simple, rapid, highly sensitive and specific sensor based on an aptamer probe and AC electrokinetics capacitive sensing method that successfully detected BPA at femto molar (fM) levels, which is an improvement over prior work by a factor of 10...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27957338/comparison-of-the-optical-quality-between-small-incision-lenticule-extraction-and-femtosecond-laser-lasik
#8
Ying Jin, Yan Wang, Lulu Xu, Tong Zuo, Hua Li, Rui Dou, Jiamei Zhang
Purpose. To investigate the visual quality after SMILE and Femto-LASIK. Methods. About 123 eyes from 63 patients were enrolled in this study. The parameters were measured preoperatively and 1 week, 1 month, and 3 months postoperatively using Sirius System. Results. The MTF curve increase slightly from low to high frequency at 3 mm and 6 mm pupil diameter after SMILE surgery (P < 0.05) during the follow-up time comparing with the preoperative values. And the SR has a significant increase at various pupil diameters as well (P < 0...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27911101/in-vivo-and-ex-vivo-evaluation-of-inflammation-and-apoptosis-induced-after-smile-procedures-for-different-refractive-error-range
#9
Leonardo Mastropasqua, Roberta Calienno, Claudia Curcio, Rodolfo Mastropasqua, Mario Nubile, Niccolò Salgari, Manuela Lanzini
PURPOSE: To detect corneal inflammation and apoptosis induced after small incision lenticule extraction (SMILE) at different refractive corrections for moderate to high values of myopia. METHODS: Fifty patients (50 eyes) suffering from medium to high myopia (spherical equivalent refraction from -3.75 to -10.00 diopters (D) with refractive astigmatism under -0.75 D) underwent SMILE in order to correct myopic error. In vivo evaluation was done by corneal confocal microscopy (IVCM) and ex vivo by immunohistochemistry...
December 2, 2016: Current Eye Research
https://www.readbyqxmd.com/read/27828513/hybrid-cavity-coupled-plasmonic-biosensors-for-low-concentration-label-free-and-selective-biomolecular-detection
#10
Abraham Vázquez-Guardado, Alexandra Smith, Wade Wilson, Jeanette Ortega, J Manuel Perez, Debashis Chanda
Simple optical techniques that can accurately and selectively identify organic and inorganic material in a reproducible manner are of paramount importance in biological sensing applications. In this work, we demonstrate that a nanoimprinted plasmonic pattern with locked-in dimensions supports sharp deterministic hybrid resonances when coupled with an optical cavity suitable for high sensitive surface detection. The surface sensing property of this hybrid system is quantified by precise atomic layer growth of aluminum oxide using the atomic layer deposition technique...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27827917/analytical-study-on-multi-tier-5g-heterogeneous-small-cell-networks-coverage-performance-and-energy-efficiency
#11
Zhu Xiao, Hongjing Liu, Vincent Havyarimana, Tong Li, Dong Wang
In this paper, we investigate the coverage performance and energy efficiency of multi-tier heterogeneous cellular networks (HetNets) which are composed of macrocells and different types of small cells, i.e., picocells and femtocells. By virtue of stochastic geometry tools, we model the multi-tier HetNets based on a Poisson point process (PPP) and analyze the Signal to Interference Ratio (SIR) via studying the cumulative interference from pico-tier and femto-tier. We then derive the analytical expressions of coverage probabilities in order to evaluate coverage performance in different tiers and investigate how it varies with the small cells' deployment density...
November 4, 2016: Sensors
https://www.readbyqxmd.com/read/27801688/current-and-effective-advantages-of-femto-phacoemulsification
#12
REVIEW
Ashvin Agarwal, Soosan Jacob
PURPOSE OF REVIEW: The purpose is to review the current and effective advantages of femtosecond laser-assisted cataract surgery (FLACS). RECENT FINDINGS: FLACS has advantages over manual phacoemulsification in its precision, and predictability and may be especially advantageous in difficult situations such as shallow anterior chamber, subluxated cataracts, white cataracts, and so on. However, the femtosecond capsulorhexis may not be as strong as a manual rhexis...
January 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27768809/heteroleptic-copper-photosensitizers-why-an-extended-%C3%AF-system-does-not-automatically-lead-to-enhanced-hydrogen-production
#13
Martin Heberle, Stefanie Tschierlei, Nils Rockstroh, Mark Ringenberg, Wolfgang Frey, Henrik Junge, Matthias Beller, Stefan Lochbrunner, Michael Karnahl
A series of heteroleptic copper(I) photosensitizers of the type [(P^P)Cu(N^N)](+) with an extended π-system in the backbone of the diimine ligand has been prepared. The structures of all complexes are completely characterized by NMR spectroscopy, mass spectrometry, and X-ray crystallography. These novel photosensitizers were assessed with respect to the photocatalytic reduction of protons in the presence of triethylamine and [Fe3 (CO)12 ]. Although the solid-state structures and computational results show no significant impact of the π-extension on the structural properties, decreased activities were observed...
October 21, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27699605/femtosecond-laser-assisted-lasik-versus-prk-for-high-myopia-comparison-of-18-month-visual-acuity-and-quality
#14
Hassan Hashemi, Reza Ghaffari, Mohammad Miraftab, Soheila Asgari
PURPOSE: To compare 18-month outcomes between femtosecond laser-assisted LASIK (femto-LASIK) and photorefractive keratectomy with mitomycin-C (PRK-MMC) for myopia of more than 7.0 D in terms of visual acuity and quality. METHODS: In this comparative nonrandomized clinical trial, 60 eyes from 30 patients (30 eyes in each group) were enrolled. The two procedures were compared in terms of 18-month changes in uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent, ocular and corneal higher order aberrations (HOAs), and contrast sensitivity (CS)...
October 3, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27699099/optofluidic-chips-with-nanochannels-for-dynamic-molecular-detection-using-enhanced-fluorescence
#15
P A Postigo, R Alvaro, A Juarros, S Merino
The fabrication of a novel optofluidic chip using nanochannels optimized for DNA-stretched molecules and optical detection by enhanced fluorescence is reported. The chips are composed of a series of microchannels that allow the transport of molecules in the femto-liter per second inside a fluid or gas. The nanochannels are surrounded by a photonic crystal structure to enhance the emission of fluorescent light from the molecules, which can travel along the nanochannel, allowing for enhanced optical detection of the molecules in motion...
September 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27643602/-experience-with-introduction-of-smile-learning-phase-of-our-first-200-treatments
#16
S Taneri, S Kießler, A Rost, B Dick
Background  Small Incision Lenticule Extraction (SMILE) is a relatively new surgical method to correct myopia and myopic astigmatism. Although considered to be safe and effective, it is not yet popular. Potential reasons for its limited use could be that surgeons fear inferior results and a higher complication rate in the learning phase. Therefore we present our experiences with the treatment of our first 200 eyes, with special attention to refraction results, complications, and learning curve. Patients and Methods  200 myopic or myopic astigmatic eyes of 102 patients were treated with SMILE...
January 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/27623280/microscale-loop-mediated-isothermal-amplification-of-viral-dna-with-real-time-monitoring-on-solution-gated-graphene-fet-microchip
#17
Dawoon Han, Rohit Chand, Yong-Sang Kim
Rapid and reliable molecular analysis of DNA for disease diagnosis is highly sought-after. FET-based sensors fulfill the demands of future point-of-care devices due to its sensitive charge sensing and possibility of integration with electronic instruments. However, most of the FETs are unstable in aqueous conditions, less sensitive and requires conventional Ag/AgCl electrode for gating. In this work, we propose a solution-gated graphene FET (SG-FET) for real-time monitoring of microscale loop-mediated isothermal amplification of DNA...
September 4, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27555334/reversible-fmn-dissociation-from-escherichia-coli-respiratory-complex-i
#18
Peter J Holt, Rouslan G Efremov, Eiko Nakamaru-Ogiso, Leonid A Sazanov
Respiratory complex I transfers electrons from NADH to quinone, utilizing the reaction energy to translocate protons across the membrane. It is a key enzyme of the respiratory chain of many prokaryotic and most eukaryotic organisms. The reversible NADH oxidation reaction is facilitated in complex I by non-covalently bound flavin mononucleotide (FMN). Here we report that the catalytic activity of E. coli complex I with artificial electron acceptors potassium ferricyanide (FeCy) and hexaamineruthenium (HAR) is significantly inhibited in the enzyme pre-reduced by NADH...
November 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27550793/the-photochemistry-of-sodium-ion-pump-rhodopsin-observed-by-watermarked-femto-to-submillisecond-stimulated-raman-spectroscopy
#19
Yusaku Hontani, Keiichi Inoue, Miroslav Kloz, Yoshitaka Kato, Hideki Kandori, John T M Kennis
Krokinobacter rhodopsin 2 (KR2) is a recently discovered light-driven Na(+) pump that holds significant promise for application as a neural silencer in optogenetics. KR2 transports Na(+) (in NaCl solution) or H(+) (in larger cation solution, e.g. in CsCl) during its photocycle. Here, we investigate the photochemistry of KR2 with the recently developed watermarked, baseline-free femto- to submillisecond transient stimulated Raman spectroscopy (TSRS), which enables us to investigate retinal chromophore dynamics in real time with high spectral resolution over a large time range...
September 21, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27531291/femtosecond-laser-assisted-cataract-surgery-first-clinical-results-with-special-regard-to-central-corneal-thickness-endothelial-cell-count-and-aqueous-flare-levels
#20
Siegfried Mariacher, Martina Ebner, Anna-Maria Seuthe, Kai Januschowski, Ciprian Ivanescu, Natalia Opitz, Peter Szurman, Karl Thomas Boden
PURPOSE: To evaluate clinical data and outcomes after femtosecond laser-assisted cataract surgery with the recently introduced low-energy Femto LDV Z8 laser during a 3-month follow-up. SETTING: Knappschaft Eye Clinic Sulzbach, Knappschaft Hospital Saar GmbH, Sulzbach, Germany. DESIGN: Consecutive case series. METHODS: Femtosecond laser-assisted cataract surgery was performed using the low-energy femtosecond laser. Clinical data including objective refraction, corrected distance visual acuity, central corneal thickness (CCT), endothelial cell count (ECC), and aqueous flare were evaluated 1 day, 1 week, 4 weeks, and 3 months postoperatively...
August 2016: Journal of Cataract and Refractive Surgery
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