Read by QxMD icon Read


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 have 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]. While 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
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
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
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...
September 19, 2016: Klinische Monatsblätter Für Augenheilkunde
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
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...
August 20, 2016: Biochimica et Biophysica Acta
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
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
Gary N Lim, Christopher O Obondi, Francis D'Souza
A high potential donor-acceptor dyad composed of zinc porphyrin bearing three meso-pentafluorophenyl substituents covalently linked to C60 , as a novel dyad capable of generating charge-separated states of high energy (potential) has been developed. The calculated energy of the charge-separated state was found to be 1.70 eV, the highest reported for a covalently linked porphyrin-fullerene dyad. Intramolecular photoinduced electron transfer leading to charge-separated states of appreciable lifetimes in polar and nonpolar solvents has been established from studies involving femto- to nanosecond transient absorption techniques...
September 12, 2016: Angewandte Chemie
T Schlote, M Kynigopoulos
No abstract text is available yet for this article.
August 5, 2016: Klinische Monatsblätter Für Augenheilkunde
Matthew O A Ellis, Eric E Fullerton, Roy W Chantrell
Magnetic recording using circularly polarised femto-second laser pulses is an emerging technology that would allow write speeds much faster than existing field driven methods. However, the mechanism that drives the magnetisation switching in ferromagnets is unclear. Recent theories suggest that the interaction of the light with the magnetised media induces an opto-magnetic field within the media, known as the inverse Faraday effect. Here we show that an alternative mechanism, driven by thermal excitation over the anisotropy energy barrier and a difference in the energy absorption depending on polarisation, can create a net magnetisation over a series of laser pulses in an ensemble of single domain grains...
2016: Scientific Reports
I M Kornilovsky, A I Sultanova, A A Burtsev
UNLABELLED: Photorefractive ablation is inevitably accompanied by oxidative stress of the cornea and weakening of its biomechanical and photoprotective properties. AIM: To validate the expediency of riboflavin use in photorefractive ablation for photoprotection of the cornea and cross-linking. MATERIAL AND METHODS: The effects of riboflavin use in photorefractive ablation was first studied in a series of in vitro and in vivo experiments performed on 56 eyes of 28 rabbits, and then on 232 eyes of 142 patients with different degrees of myopia...
May 2016: Vestnik Oftalmologii
J Pina, M-J R P Queiroz, J Seixas de Melo
A complete and systematic study of the spectroscopic and photophysical properties of five novel diarylamines in the benzo[b]thiophene series (oligoanilines) was performed in solution at room (293 K) and low (77 K) temperature. The title compounds resulting from the link between one aniline unit with a benzo[b]thiophene unit (with two different methyl and methoxy substitution) were characterized using steady-state absorption, fluorescence and phosphorescence spectroscopy, as well as femto- to nano-second time resolved spectroscopies...
August 4, 2016: Photochemical & Photobiological Sciences
Chenguang Xin, Shaoliang Yu, Qingyang Bao, Xiaoqin Wu, Bigeng Chen, Yipei Wang, Yingxin Xu, Zongyin Yang, Limin Tong
On the basis of the transverse second harmonic generation (TSHG) in a highly nonlinear subwavelength-diameter CdTe nanowire, we demonstrate a single-nanowire optical correlator for femto-second pulse measurement with pulse energy down to femtojoule (fJ) level. Pulses to be measured were equally split and coupled into two ends of a suspending nanowire via tapered optical fibers. The couterpropagating pulses meet each other around the central area of the nanowire, and emit TSHG signal perpendicular to the axis of the nanowire...
August 10, 2016: Nano Letters
Wu Bian, Yao Huang, Hua Guan, Peiliang Liu, Longsheng Ma, Kelin Gao
A Ti:sapphire laser at 729 nm is frequency stabilized to an ultra-stable ultra-low thermal expansion coefficient (ULE) cavity by means of Pound-Drever-Hall method. An acousto-optic modulator is used as the fast frequency feedback component. 1 Hz linewidth and 2 × 10(-15) frequency stability at 1-100 s are characterized by optical beating with a separated Fabry-Perot cavity stabilized diode laser. Compared to the universal method that the error signal feedback to inject current of a diode laser, this scheme is demonstrated to be simple and also effective for linewidth narrowing...
June 2016: Review of Scientific Instruments
Cheng Cheng, Shutong Wang, Jayne Wu, Yongchao Yu, Ruozhou Li, Shigetoshi Eda, Jiangang Chen, Guoying Feng, Benjamin Lawrie, Anming Hu
This work presents an aptamer-based, highly sensitive and specific sensor for atto- to femtomolar level detection of bisphenol A (BPA). Because of its widespread use in numerous products, BPA enters surface water from effluent discharges during its manufacture, use, and from waste landfill sites throughout the world. On-site measurement of BPA concentrations in water is important for evaluating compliance with water quality standards or environmental risk levels of the harmful compound in the environment. The sensor in this work is porous, conducting, interdigitated electrodes that are formed by laser-induced carbonization of flexible polyimide sheets...
July 20, 2016: ACS Applied Materials & Interfaces
M Armano, H Audley, G Auger, J T Baird, M Bassan, P Binetruy, M Born, D Bortoluzzi, N Brandt, M Caleno, L Carbone, A Cavalleri, A Cesarini, G Ciani, G Congedo, A M Cruise, K Danzmann, M de Deus Silva, R De Rosa, M Diaz-Aguiló, L Di Fiore, I Diepholz, G Dixon, R Dolesi, N Dunbar, L Ferraioli, V Ferroni, W Fichter, E D Fitzsimons, R Flatscher, M Freschi, A F García Marín, C García Marirrodriga, R Gerndt, L Gesa, F Gibert, D Giardini, R Giusteri, F Guzmán, A Grado, C Grimani, A Grynagier, J Grzymisch, I Harrison, G Heinzel, M Hewitson, D Hollington, D Hoyland, M Hueller, H Inchauspé, O Jennrich, P Jetzer, U Johann, B Johlander, N Karnesis, B Kaune, N Korsakova, C J Killow, J A Lobo, I Lloro, L Liu, J P López-Zaragoza, R Maarschalkerweerd, D Mance, V Martín, L Martin-Polo, J Martino, F Martin-Porqueras, S Madden, I Mateos, P W McNamara, J Mendes, L Mendes, A Monsky, D Nicolodi, M Nofrarias, S Paczkowski, M Perreur-Lloyd, A Petiteau, P Pivato, E Plagnol, P Prat, U Ragnit, B Raïs, J Ramos-Castro, J Reiche, D I Robertson, H Rozemeijer, F Rivas, G Russano, J Sanjuán, P Sarra, A Schleicher, D Shaul, J Slutsky, C F Sopuerta, R Stanga, F Steier, T Sumner, D Texier, J I Thorpe, C Trenkel, M Tröbs, H B Tu, D Vetrugno, S Vitale, V Wand, G Wanner, H Ward, C Warren, P J Wass, D Wealthy, W J Weber, L Wissel, A Wittchen, A Zambotti, C Zanoni, T Ziegler, P Zweifel
We report the first results of the LISA Pathfinder in-flight experiment. The results demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density of 5.2±0.1  fm s^{-2}/sqrt[Hz], or (0.54±0.01)×10^{-15}  g/sqrt[Hz], with g the standard gravity, for frequencies between 0.7 and 20 mHz. This value is lower than the LISA Pathfinder requirement by more than a factor 5 and within a factor 1...
June 10, 2016: Physical Review Letters
N P Pashtaev, N A Pozdeeva, M V Sinitsyn, V V Zotov, B V Gagloev
AIM: To perform a comparative analysis of the following cross-linking techniques: standard cross-linking (SCXL), local transepithelial femto cross-linking (LTF) and transepithelial intrastromal femto cross-linking with MyoRing implantation (TIF+MyoRing) in experimental animals and patients with progressive stage II--III keratoconus (KC), paying particular attention to the changes in biomechanical stability of the cornea. MATERIAL AND METHODS: The experimental series was performed on 20 eyes of 10 rabbits...
March 2016: Vestnik Oftalmologii
Yang-Seok Park, Vijaya Sunkara, Yubin Kim, Won Seok Lee, Ja-Ryoung Han, Yoon-Kyoung Cho
Enzyme-linked immunosorbent assay (ELISA) is a promising method to detect small amount of proteins in biological samples. The devices providing a platform for reduced sample volume and assay time as well as full automation are required for potential use in point-of-care-diagnostics. Recently, we have demonstrated ultrasensitive detection of serum proteins, C-reactive protein (CRP) and cardiac troponin I (cTnI), utilizing a lab-on-a-disc composed of TiO2 nanofibrous (NF) mats. It showed a large dynamic range with femto molar (fM) detection sensitivity, from a small volume of whole blood in 30 min...
2016: Journal of Visualized Experiments: JoVE
M N Hindia, T A Rahman, H Ojukwu, E B Hanafi, A Fattouh
As the enterprise of the "Internet of Things" is rapidly gaining widespread acceptance, sensors are being deployed in an unrestrained manner around the world to make efficient use of this new technological evolution. A recent survey has shown that sensor deployments over the past decade have increased significantly and has predicted an upsurge in the future growth rate. In health-care services, for instance, sensors are used as a key technology to enable Internet of Things oriented health-care monitoring systems...
2016: PloS One
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"