keyword
MENU ▼
Read by QxMD icon Read
search

Optic

keyword
https://www.readbyqxmd.com/read/28092734/combined-utilization-of-nutrients-and-sugar-derived-from-wheat-bran-for-d-lactate-fermentation-by-sporolactobacillus-inulinus-ybs1-5
#1
Jiahuang Li, Junfei Sun, Bin Wu, Bingfang He
To decrease d-Lactate production cost, wheat bran, a low-cost waste of milling industry, was selected as the sole feedstock. First, the nutrients were recovered from wheat bran by acid protease hydrolysis. Then, cellulosic hydrolysates were prepared from protease-treated samples after acid pretreatment and enzymatic saccharification. The combined use of nutrients and hydrolysates as nitrogen and carbon sources for fermentation by S. inulinus YB1-5 resulted in d-Lactate levels of 99.5g/L, with an average production efficiency of 1...
December 30, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/28092687/a-charge-density-wave-like-instability-in-a-doped-spin-orbit-assisted-weak-mott-insulator
#2
H Chu, L Zhao, A de la Torre, T Hogan, S D Wilson, D Hsieh
Layered perovskite iridates realize a rare class of Mott insulators that are predicted to be strongly spin-orbit coupled analogues of the parent state of cuprate high-temperature superconductors. Recent discoveries of pseudogap, magnetic multipolar ordered and possible d-wave superconducting phases in doped Sr2IrO4 have reinforced this analogy among the single layer variants. However, unlike the bilayer cuprates, no electronic instabilities have been reported in the doped bilayer iridate Sr3Ir2O7. Here we show that Sr3Ir2O7 realizes a weak Mott state with no cuprate analogue by using ultrafast time-resolved optical reflectivity to uncover an intimate connection between its insulating gap and antiferromagnetism...
January 16, 2017: Nature Materials
https://www.readbyqxmd.com/read/28092628/ultrafast-adiabatic-second-harmonic-generation
#3
Asaf Dahan, Assaf Levanon, Mordechai Katz, Haim Suchowski
We introduce a generalization of the adiabatic frequency conversion method for an efficient conversion of ultrashort pulses in the full nonlinear regime. Our analysis takes into account dispersion as well as two-photon processes and Kerr effect, allowing complete analysis of any three waves with arbitrary phase mismatched design and any nonlinear optical process. We use this analysis to design an efficient and robust second harmonic generation, the most widely used nonlinear process for both fundamental and applied research...
January 16, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28092560/diffeomorphic-multi-frame-non-rigid-registration-of-cell-nuclei-in-2d-and-3d-live-cell-images
#4
Marco Tektonidis, Karl Rohr
To gain a better understanding of cellular and molecular processes it is important to quantitatively analyze the motion of subcellular particles in live cell microscopy image sequences. Since generally the subcellular particles move and cell nuclei move as well as deform, it is important to decouple the movement of particles from that of the cell nuclei using nonrigid registration methods. We have developed a diffeomorphic multi-frame approach for non-rigid registration of cell nuclei in 2D and 3D live cell fluorescence microscopy images...
January 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092516/single-camera-based-method-for-step-length-symmetry-measurement-in-unconstrained-elderly-home-monitoring
#5
Xi Cai, Guang Han, Xin Song, Jinkuan Wang
OBJECTIVE: Single-camera-based gait monitoring is unobtrusive, inexpensive and easy-to-use to monitor daily gait of seniors in their homes. However, most studies require subjects to walk perpendicularly to camera's optical axis or along some specified routes, which limits its application in elderly home monitoring. To build unconstrained monitoring environments, we propose a method to measure step length symmetry ratio (a useful gait parameter representing gait symmetry without significant relationship with age) from unconstrained straight walking using a single camera, without strict restrictions on walking directions or routes...
January 16, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28092507/real-time-intravascular-ultrasound-and-photoacoustic-imaging
#6
Donald VanderLaan, Andrei B Karpiouk, Doug Yeager, Stanislav Emelianov
Combined intravascular ultrasound and intravascular photoacoustic (IVUS/IVPA) imaging is an emerging hybrid modality being explored as a means of improving the characterization of atherosclerotic plaque anatomical and compositional features. While initial demonstrations of the technique have been encouraging, they have been limited by catheter rotation and data acquisition, displaying, and processing rates on the order of several seconds per frame as well as the use of off-line image processing. Herein, we present a complete IVUS/IVPA imaging system and method capable of real-time IVUS/IVPA imaging, with online data acquisition, image processing, and display of both IVUS and IVPA images...
January 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092500/a-model-of-a-synthetic-biological-communication-interface-between-mammalian-cells-and-mechatronic-systems
#7
Keith C Heyde, Warren C Ruder
The creation of communication interfaces between abiotic and biotic systems represents a significant research challenge. In this work, we design and model a system linking the biochemical signaling pathways of mammalian cells to the actions of a mobile robotic prosthesis. We envision this system as a robotic platform carrying an optically monitored bioreactor that harbors mammalian cells. The cellular, optical signal is captured by an onboard fluorescent microscope and converted into an electronic signal. We first present a design for the overall cell-robot system, with a specific focus on the design of the synthetic gene networks needed for the system...
December 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28092436/single-upconversion-nanoparticle-bacterium-cotrapping-for-single-bacterium-labeling-and-analysis
#8
Hongbao Xin, Yuchao Li, Dekang Xu, Yueli Zhang, Chia-Hung Chen, Baojun Li
Detecting and analyzing pathogenic bacteria in an effective and reliable manner is crucial for the diagnosis of acute bacterial infection and initial antibiotic therapy. However, the precise labeling and analysis of bacteria at the single-bacterium level are a technical challenge but very important to reveal important details about the heterogeneity of cells and responds to environment. This study demonstrates an optical strategy for single-bacterium labeling and analysis by the cotrapping of single upconversion nanoparticles (UCNPs) and bacteria together...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092434/3d-probed-lipid-dynamics-in-small-unilamellar-vesicles
#9
Meng-Hsuan Chao, Yen-Ting Lin, Namasivayam Dhenadhayalan, Hsin-Lung Lee, Hsin-Yen Lee, King-Chuen Lin
Single-molecule fluorescence correlation spectroscopy overcomes the resolution barrier of optical microscopy (10≈-20 nm) and is utilized to look into lipid dynamics in small unilamellar vesicles (SUVs; diameter < 100 nm). The fluorescence trajectories of lipid-like tracer 1,1'-dioctadecyl-3,3,3',3'-tetramethylindodicarbocyanine (DiD) in the membrane bilayers are acquired at a single-molecule level. The autocorrelation analysis yields the kinetic information on lipid organization, oxygen transport, and lateral diffusion in SUVs' membrane...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092424/continuous-films-of-self-assembled-graphene-quantum-dots-for-n-type-doping-of-graphene-by-uv-triggered-charge-transfer
#10
Myung Jin Park, Yuna Kim, Youngsoo Kim, Byung Hee Hong
The demands to examine components serving as one of the active layers in heterostructures of 2D materials have been recently increasing. Nanomaterials synthesized from a solution process and their self-assembly can provide a promising route to build a new type of mixed dimensional heterostructures, and several methodologies have been reported previously to construct 2D assemblies from colloidal nanostructures in solution. Graphene quantum dots (GQDs), receiving much interest due to the tunable optical band gap and the capability of chemical functionalization, are considered as emerging nanomaterials for various optoelectronic and biological applications...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092396/agreement-between-three-optical-coherence-tomography-devices-to-assess-the-insertion-distance-and-thickness-of-horizontal-rectus-muscles
#11
Lucía De-Pablo-Gómez-de-Liaño, José Ignacio Fernández-Vigo, Néstor Ventura-Abreu, Julián García-Feijóo, José Ángel Fernández-Vigo, Rosario Gómez-de-Liaño
PURPOSE: To assess the agreement between two different spectral domain (SD-OCT) and one swept source (SS-OCT) optical coherence tomography device to measure the insertion distance and the thickness of the horizontal rectus muscles. METHODS: Seventy eyes from 35 healthy patients were studied. Three OCT instruments-Spectralis (Heidelberg Engineering Inc., Heidelberg, Germany), Cirrus 5000 (Carl Zeiss Meditec, Dublin, CA), and Triton (Topcon, Inc., Tokyo, Japan)-were used to measure the limbus insertion distance and the thickness of the lateral rectus and medial rectus muscles...
January 13, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28092378/opto-valleytronic-imaging-of-atomically-thin-semiconductors
#12
Andre Neumann, Jessica Lindlau, Léo Colombier, Manuel Nutz, Sina Najmaei, Jun Lou, Aditya D Mohite, Hisato Yamaguchi, Alexander Högele
Transition metal dichalcogenide semiconductors represent elementary components of layered heterostructures for emergent technologies beyond conventional optoelectronics. In their monolayer form they host electrons with quantized circular motion and associated valley polarization and valley coherence as key elements of opto-valleytronic functionality. Here, we introduce two-dimensional polarimetry as means of direct imaging of the valley pseudospin degree of freedom in monolayer transition metal dichalcogenides...
January 16, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28092342/integrity-of-outer-retinal-layers-after-resolution-of-central-involved-diabetic-macular-edema
#13
Ilkay Kilic Muftuoglu, Nadia Mendoza, Raouf Gaber, Mostafa Alam, Qisheng You, William R Freeman
PURPOSE: To evaluate the integrity of outer retina layers after resolution of central involved diabetic macular edema (DME) and to demonstrate the effect of various baseline factors for the final vision and final external limiting membrane (ELM) integrity. METHODS: Fifty-nine eyes of 48 patients with resolved DME were included. Several optical coherence tomography parameters including central subfield thickness, maximum foveal thickness, foveal center point thickness, and the extent of the ellipsoidal (ISe) layer and ELM damage were assessed at the time of DME and after resolution of DME...
January 13, 2017: Retina
https://www.readbyqxmd.com/read/28092315/choroidal-blood-vessels-in-retinal-pigment-epithelial-atrophy-using-optical-coherence-tomography-angiography
#14
Ichiro Maruko, Hideki Koizumi, Shota Sawaguchi, Taiji Hasegawa, Hisaya Arakawa, Tomohiro Iida
PURPOSE: To observe choroidal blood vessels in cases sharply demarcated with retinal pigment epithelium (RPE) atrophy at the macular area using en-face optical coherence tomography angiography (OCTA) and standard en-face optical coherence tomography (OCT). METHODS: The retrospective study included 12 eyes (8 patients; 5 men, 3 women; average age, 64.3 years) with RPE atrophy seen by ophthalmoscopy. The macular areas with normal and atrophic RPE sections were examined using en-face OCTA with an 840-nm light source (RTVue XR Avanti; Optovue Inc), which system can obtain standard en-face OCT images at identical areas...
January 13, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28092274/power-profiles-and-in-vitro-optical-quality-of-scleral-contact-lenses-effect-of-the-aperture-and-power
#15
Alberto Domínguez-Vicent, Jose Juan Esteve-Taboada, Alberto Recchioni
OBJECTIVE: To assess the power profile and in vitro optical quality of scleral contact lenses with different powers as a function of the optical aperture. METHODS: The mini and semiscleral contact lenses (Procornea) were measured for five powers per design. The NIMO TR-1504 (Lambda-X) was used to assess the power profile and Zernike coefficients of each contact lens. Ten measurements per lens were taken at 3- and 6-mm apertures. Furthermore, the optical quality of each lens was described in Zernike coefficients, modulation transfer function, and point spread function (PSF)...
January 13, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28092130/topological-valleytronic-and-optical-properties-of-monolayer-pbs
#16
Wenhui Wan, Yugui Yao, Liangfeng Sun, Cheng-Cheng Liu, Fan Zhang
A PbS monolayer is demonstrated to be a novel platform for topological, valleytronic, and optical phenomena. Compressive strain can turn the trivial monolayer into topological insulators. Optical pumping can facilitate charge, spin, and valley Hall effects tunable by external strain and light ellipticity. Similar results apply to other IV-VI semiconductors.
January 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28091966/aortic-regurgitation-generates-a-kinematic-obstruction-which-hinders-left-ventricular-filling
#17
Ikechukwu Okafor, Vrishank Raghav, Jose F Condado, Prem A Midha, Gautam Kumar, Ajit P Yoganathan
An incompetent aortic valve (AV) results in aortic regurgitation (AR), where retrograde flow of blood into the left ventricle (LV) is observed. In this work, we parametrically characterized the detailed changes in intra-ventricular flow during diastole as a result of AR in a physiological in vitro left-heart simulator (LHS). The loss of energy within the LV as the level of AR increased was also assessed. The validated LHS consisted of an optically-clear, flexible wall LV and a modular AV holder. Two-component, planar, digital particle image velocimetry was used to visualize and quantify intra-ventricular flow...
January 13, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28091949/nonmechanical-infrared-beam-steering-using-blue-addressed-quantum-dot-doped-liquid-crystal-grating
#18
Xiangru Wang, Xiaoping Huang, Ziqiang Huang, Liang Wu, Jiyang Shang, Qi Qiu, Shuanghong Wu
We present a scheme of nonmechanical laser beam steering using ZnS/InP quantum dots doping nematic liquid crystal as the optical recording film. Because of its internal electric field generated by blue laser-induced charge carrier distribution, liquid crystal molecules are reoriented to form a phase grating which make the incident angle steer to the angle as we desire. Being a nonmechanical programmable laser beam steering, the anisotropy of the relative permittivity tensor and blue laser-induced electric carriers play a significant effect in determining the reorientable liquid crystal molecule and reconfigurable phase modulation of the gratings, that determines the steering angle and steering efficiency...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091938/distinguishing-features-of-acute-vogt-koyanagi-harada-disease-and-acute-central-serous-chorioretinopathy-on-optical-coherence-tomography-angiography-and-en-face-optical-coherence-tomography-imaging
#19
Kanika Aggarwal, Aniruddha Agarwal, Ankit Deokar, Sarakshi Mahajan, Ramandeep Singh, Reema Bansal, Aman Sharma, Mangat R Dogra, Vishali Gupta
BACKGROUND: The aim of this study is to determine the differences in optical coherence tomography angiography (OCTA) features of acute Vogt-Koyanagi-Harada disease (VKH) and acute central serous chorioretinopathy (CSC). Clinical and imaging data of patients with acute CSC and VKH in a tertiary-care institute were analyzed. Multimodal imaging including fluorescein angiography, indocyanine green angiography (ICGA), and enhanced-depth imaging OCT were performed. OCTA images were analyzed for alterations in retinochoroidal microvasculature...
December 2017: Journal of Ophthalmic Inflammation and Infection
https://www.readbyqxmd.com/read/28091849/dynamic-optical-absorption-characteristics-of-blood-after-slow-and-fast-heating
#20
Hao Jia, Bin Chen, Dong Li
Laser treatment is the most effective therapy in dermatology for vascular skin disorders, such as port-wine stains (PWS). Changes in heat-induced absorbance in blood must be determined for accurate numerical simulation and implementation of multi-pulse laser therapy for treatment of PWS. Thermally induced absorbance changes in hemoglobin in blood were compared in vitro between slow water bath heating and fast heating irradiated by using sub-millisecond Nd:YAG laser. Blood composition at different temperatures was calculated by comparing blood absorption spectra with those of pure HbO2, Hb, and metHb at room temperature...
January 13, 2017: Lasers in Medical Science
keyword
keyword
4240
1
2
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"