keyword
MENU ▼
Read by QxMD icon Read
search

Optic

keyword
https://www.readbyqxmd.com/read/28637350/structural-peculiarities-of-ion-conductive-organic-inorganic-polymer-composites-based-on-aliphatic-epoxy-resin-and-salt-of-lithium-perchlorate
#1
Liubov Matkovska, Maksym Iurzhenko, Yevgen Mamunya, Igor Tkachenko, Valeriy Demchenko, Volodymyr Synyuk, Andriy Shadrin, Gisele Boiteux
The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electron microscopy, elemental analysis, and transmission and reflective optical microscopy. On the one hand, the results showed that the introduction of LiClO4 salt into epoxy polymer leads to formation of the coordinative metal-polymer complexes of donor-acceptor type between central Li(+) ion and ligand...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28637033/quantitative-swept-source-optical-coherence-tomography-of-early-enamel-erosion-in-vivo
#2
Rupert S Austin, Maisalamah Haji Taha, Frederic Festy, Richard Cook, Manoharan Andiappan, Juliana Gomez, Iain A Pretty, Rebecca Moazzez
Swept-source optical coherence tomography (SS-OCT) shows potential for the in vivo quantitative evaluation of micro-structural enamel surface phenomena occurring during early erosive demineralization. This randomized controlled single-blind cross-over clinical study aimed to evaluate the use of SS-OCT for detecting optical changes in the enamel of 30 healthy volunteers subjected to orange juice rinsing (erosive challenge) in comparison to mineral water rinsing (control), according to wiped and non-wiped enamel surface states...
June 22, 2017: Caries Research
https://www.readbyqxmd.com/read/28636928/neurovascular-toxicity-of-n-methyl-d-aspartate-is-markedly-enhanced-in-the-developing-mouse-central-nervous-system
#3
Sudhakar Vadivelu, Kui Xu, Vanja Tolj, Rahul Rege, Lindsay Darkins, Karthik Vishwanath
Penumbral perfusion is critical to brain viability. Proximal arterial occlusion and deep brain stroke has variable effect on cortical dysfunction. Cortical microvessel collaterals may be recruited and at times sufficient for partial parenchymal perfusion. Postnatal neural and endothelial cells are markedly vulnerable to glutamate excitotoxicity. Early vascular cell stress may promote partial protective neural preconditioning though postnatally a developmental window of the cerebral microvasculature may be particularly vulnerable to injury...
June 18, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28636776/facile-synthesis-and-chain-length-dependent-optical-and-structural-properties-of-diketopyrrolopyrrole-based-oligomers
#4
Satish Patil, Tushita Mukhopadhyay, Boregowda Puttaraju, Palas Roy, Jyotishman Dasgupta, Andreas Meyer
Here we report the synthesis, optical properties and solid-state packing of monodisperse oligomers of DPP up to five repeating units. Optical properties of DPP-oligomers in solution and solid state were investigated by a combination of steady-state, and transient spectroscopy. Transient absorption spectroscopy and time-correlated single photon counting (TCSPC) measurements show that the fluorescence lifetime decreases with increase in the oligomer size from monomer to trimer, thereby reaching saturation for pentameric DPP oligomer...
June 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28636640/targeted-nanodiamonds-for-identification-of-subcellular-protein-assemblies-in-mammalian-cells
#5
Michael P Lake, Louis-S Bouchard
Transmission electron microscopy (TEM) can be used to successfully determine the structures of proteins. However, such studies are typically done ex situ after extraction of the protein from the cellular environment. Here we describe an application for nanodiamonds as targeted intensity contrast labels in biological TEM, using the nuclear pore complex (NPC) as a model macroassembly. We demonstrate that delivery of antibody-conjugated nanodiamonds to live mammalian cells using maltotriose-conjugated polypropylenimine dendrimers results in efficient localization of nanodiamonds to the intended cellular target...
2017: PloS One
https://www.readbyqxmd.com/read/28636408/pattern-visual-evoked-potential-pattern-electroretinogram-and-retinal-nerve-fiber-layer-thickness-in-patients-with-migraine-during-and-after-aura
#6
Amany Abd El-Fattah El-Shazly, Yousra Ahmed Farweez, Momen Mahmoud Hamdi, Noha Ezzat El-Sherbiny
PURPOSE: To study pattern visual evoked potential (PVEP), pattern electroretinogram (PERG), and retinal nerve fiber layer (RNFL) thickness in patients with migraine during and after aura. MATERIALS AND METHODS: We included 60 eyes of 60 patients with migraine (Group 1) and 30 healthy volunteers (30 eyes) as controls (Group 2). Group 1 was studied twice, during a visual aura (1-a) and in between attacks (1-b). All participants underwent full ophthalmological examination, PVEP, PERG, and optical coherence tomographyOCT imaging of the RNFL thickness for each patient...
June 21, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28636406/protective-effect-of-intravitreal-administration-of-exosomes-derived-from-mesenchymal-stem-cells-on-retinal-ischemia
#7
Elad Moisseiev, Johnathon D Anderson, Sharon Oltjen, Mayank Goswami, Robert J Zawadzki, Jan A Nolta, Susanna S Park
PURPOSE: Exosomes derived from human mesenchymal stem cells (hMSCs) cultured under hypoxic conditions contain proteins and growth factors that promote angiogenesis. This study investigated the effect of intravitreal administration of these exosomes on retinal ischemia using a murine model. METHODS: Oxygen-induced retinopathy (OIR) was induced by exposing one-week-old male C57BL/6J mice to 5 days of 75% hyperoxic conditioning, and returning to room air. After hyperoxic conditioning, the right eye of each mouse was injected intravitreally with 1 µl saline or exosomes derived from hMSCs and compared to control mice of the same age raised in room air without OIR injected intravitreally with saline...
June 21, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28636342/charge-transfer-properties-of-triarylamine-integrated-dimolybdenum-dyads
#8
Lu Chen, Suman Mallick, Ying Ning Tan, Miao Meng, Chun Y Liu
Three quadruply bonded dimolybdenum complexes equipped with a triarylamine pendant, [(DAniF)3Mo2(μ-O2CC6H4N(C6H4CH3)2] (DAniF = N,N'-di(p-anisyl)formamidinate; [OO-ph-N]), [(DAniF)3Mo2(μ-OSCC6H4N(C6H4CH3)2] ([OS-ph-N]), and [(DAniF)3Mo2(μ-S2CC6H4N(C6H4CH3)2] ([SS-ph-N]), have been synthesized and characterized by single crystal X-ray diffraction. In electrochemical measurements, the redox couple for the organic amine group becomes irreversible, reflecting the substantially strong electronic interaction between the dimetal center and organic redox site...
June 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28636332/new-insights-into-the-wavelength-dependence-of-maldi-mass-spectrometry
#9
Marcel Niehaus, Andreas Schnapp, Annika Koch, Jens Soltwisch, Klaus Dreisewerd
The interplay between the wavelength of the laser and the absorption profile of the matrix constitutes a crucial factor in matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS). Numerous studies have shown that typically best analytical results are obtained if the laser wavelength matches the UV absorption band of the matrix in the solid state well. However, many powerful matrices exhibit peak absorptions which differ notably from the standard MALDI laser wavelengths of 337, 349, and 355 nm, respectively...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636327/maldi-ms-guided-liquid-microjunction-extraction-for-ce-esi-ms-analysis-of-single-pancreatic-islet-cells
#10
Troy J Comi, Monika A Makurath, Marina C Philip, Stanislav S Rubakhin, Jonathan V Sweedler
The ability to characterize chemical heterogeneity in biological structures is essential to understanding cellular level function in both healthy and diseased states, but these variations remain difficult to assess using a single analytical technique. While mass spectrometry (MS) provides sufficient sensitivity to measure many analytes from volume-limited samples, each type of mass spectrometric analysis uncovers only a portion of the complete chemical profile of a single cell. Matrix-assisted laser desorp-tion/ionization (MALDI) MS and capillary electrophoresis electrospray ionization (CE-ESI)-MS are complementary analytical platforms frequently utilized for single cell analysis...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636288/the-first-total-synthesis-of-ovafolinin-a-and-b-unique-polycyclic-benzoxepin-lignans-via-a-cascade-cyclization
#11
Samuel James Davidson, David Barker
Ovafolinins A and B, isolated from Lyonia ovalifolia var. elliptica, are lignans which contain a unique penta- and tetracyclic benzoxepin bridged aryl tetralin structure. We report the first total synthesis of these natural products initially utilizing an acyl-Claisen rearrangement to construct the lignan backbone with correct relative stereochemistry. Judicious use of a bulky protecting group placed reactive moieties in the correct orientation resulting in a cascade reaction forming the benzoxepin bridged aryl tetralin from a linear precursor in a single step...
June 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28636255/recombinant-human-serum-albumin-for-corneal-preservation
#12
Mohit Parekh, Hossein Elbadawy, Gianni Salvalaio, Marie-Claude Amoureux, Enzo Di Iorio, Denis Fortier, Diego Ponzin, Stefano Ferrari, Alessandro Ruzza
PURPOSE: To study the performance of a completely synthetic organ culture (OC) preservation system containing recombinant human serum albumin (rHSA) for preservation of human donor corneas. METHODS: Twenty-four paired donor corneas were randomly collected, and one cornea from each donor was preserved in synthetic (experimental) and serum-based media (control). The tissues were assessed at day 0; after 6 days of preservation at room temperature (RT) in Cornea Trans(®) and Cornea Prep II(®) ; after 28 days at 31°C in Cornea Syn(®) [with rHSA] and Cornea Max(®) [with foetal calf serum (FCS)] and; 4-day post deswelling in Cornea Trans(®) and Cornea Jet(®) ...
June 21, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28636231/orchestration-at-the-beginning-mitosis-in-sea-urchin-embryo
#13
Giselle A Abruzzese, Nae Tanpradit, Renata S Tavares
Development of multicellular organisms is driven by a series of mitotic divisions after fertilization. Total cytoplasmic volume does not increase during this process, resulting in an increasing number of smaller daughter cells. Cell divisions are initially synchronous in an early embryo, but this ends at the 16-cell stage in the sea urchin. Orchesterated mitosis does, however, continue in subpopulations via the coordination of two different processes: karyokinesis and cytokinesis. Part of this asynchrony is due to the differentiation of lineages...
June 21, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28636164/a-nanostructured-microfluidic-immunoassay-platform-for-highly-sensitive-infectious-pathogen-detection
#14
Xu Yu, Yiqiu Xia, Yi Tang, Wen-Long Zhang, Yin-Ting Yeh, Huaguang Lu, Si-Yang Zheng
Rapid and simultaneous detection of multiple potential pathogens by portable devices can facilitate early diagnosis of infectious diseases, and allow for rapid and effective implementation of disease prevention and treatment measures. The development of a ZnO nanorod integrated microdevice as a multiplex immunofluorescence platform for highly sensitive and selective detection of avian influenza virus (AIV) is described. The 3D morphology and unique optical property of the ZnO nanorods boost the detection limit of the H5N2 AIV to as low as 3...
June 2017: Small
https://www.readbyqxmd.com/read/28636086/selective-and-tunable-near-infrared-and-visible-light-transmittance-of-moo3-x-nanocomposites-with-different-crystallinity
#15
Ning Li, Yamei Li, Guangyao Sun, Yining Ma, Tianci Chang, Shidong Ji, Heliang Yao, Xun Cao, Shanhu Bao, Ping Jin
In this Communication, we report MoO3-x nanocomposites in which the near-infrared and visible light transmittance can be selectively modulated through the crystallinity. The MoO3-x nanocomposites were fabricated by a hydrothermal method, and their optical properties were characterized by UV-Vis spectrometer. The obtained results proved the possibility to tune the nanocomposite's optical properties in the UV/Visible spectral region: crystalline MoO3 mainly regulates the near-infrared range (800-2600 nm), and amorphous MoO3-x mainly changes the visible range from 350 nm to 800 nm and MoO3-x , with semi-crystalline structures mainly modulating around 800-1000 nm...
June 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28636066/assessment-of-the-cross-bridge-induced-interaction-of-red-blood-cells-by-optical-trapping-combined-with-microfluidics
#16
Kisung Lee, Christian Wagner, Alexander V Priezzhev
No abstract text is available yet for this article.
September 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28636065/automatic-motion-correction-for-in-vivo-human-skin-optical-coherence-tomography-angiography-through-combined-rigid-and-nonrigid-registration
#17
David Wei Wei, Anthony J Deegan, Ruikang K Wang
No abstract text is available yet for this article.
June 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28635665/towards-a-uniform-metrological-assessment-of-grating-based-optical-fiber-sensors-from-refractometers-to-biosensors
#18
REVIEW
Francesco Chiavaioli, Carlos A J Gouveia, Pedro A S Jorge, Francesco Baldini
A metrological assessment of grating-based optical fiber sensors is proposed with the aim of providing an objective evaluation of the performance of this sensor category. Attention was focused on the most common parameters, used to describe the performance of both optical refractometers and biosensors, which encompassed sensitivity, with a distinction between volume or bulk sensitivity and surface sensitivity, resolution, response time, limit of detection, specificity (or selectivity), reusability (or regenerability) and some other parameters of generic interest, such as measurement uncertainty, accuracy, precision, stability, drift, repeatability and reproducibility...
June 21, 2017: Biosensors
https://www.readbyqxmd.com/read/28635642/lack-of-association-between-serum-vitamin-b%C3%A2-vitamin-b12-and-vitamin-d-levels-with-different-types-of-glaucoma-a-systematic-review-and-meta-analysis
#19
Shengjie Li, Danhui Li, Mingxi Shao, Wenjun Cao, Xinghuai Sun
Although vitamins play a major role in health, and their deficiency may be linked to symptoms of optic-nerve dysfunction, the association between serum vitamin levels and glaucoma in humans remains controversial. In this study, articles in the PubMed, Web of Science, and EMBASE databases were searched up to 25March 2017. Nine studies on primary open-angle glaucoma (POAG), four studies on normal tension glaucoma (NTG), and six studies on exfoliative glaucoma (EXG) were retrieved. The combined results showed no differences in the levels of serum vitamin B₆ between POAG (p = 0...
June 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28635629/light-emitting-marker-for-robust-vision-based-on-the-spot-bacterial-growth-detection
#20
Kyukwang Kim, Jieum Hyun, Jessie S Jeon
Simple methods using the striped pattern paper marker and FFT (fast Fourier transformation) have been proposed as alternatives to measuring the optical density for determining the level of bacterial growth. The marker-based method can be easily automated, but due to image-processing-base of the method, the presence of light or the color of the culture broth can disturb the detection process. This paper proposes a modified version of marker-FFT-based growth detection that uses a light emitting diode (LED) array as a marker...
June 21, 2017: Sensors
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"