keyword
MENU ▼
Read by QxMD icon Read
search

Polarimetry

keyword
https://www.readbyqxmd.com/read/28917855/chiroplasmonic-magnetic-gold-nanocomposites-produced-by-one-step-aqueous-method-using-%C3%AE%C2%BA-carrageenan
#1
Marina V Lesnichaya, Boris G Sukhov, Galina P Aleksandrova, Ekaterina R Gasilova, Tamara I Vakul'skaya, Spartak S Khutsishvili, Anatoliy N Sapozhnikov, Igor V Klimenkov, Boris A Trofimov
Novel water-soluble chiroplasmonic nanobiocomposites with directly varied gold content were synthesized by a one-step redox method in water using a biocompatible polysaccharide κ-carrageenan (industrial product from algae) as both reducing and stabilizing matrix. The influence of the reactants ratio, temperature, and pH on the reaction was studied and the optimal reaction parameters were found. The structure and the properties of composite nanomaterials were examined in solid state and aqueous solutions by using complementary physical-chemical methods X-ray diffraction analysis, transmission electron microscopy, spectroscopy of electron paramagnetic resonance, atomic absorption and optical spectroscopy, polarimetry including optical rotatory dispersion with registration of interphase-crossbred Cotton effect of a chiral polysaccharide matrix on plasmonic chromophore of gold nanoparticles, dynamic and static light scattering...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28872897/a-novel-strategy-to-seek-biosignatures-at-enceladus-and-europa
#2
Philip Judge
A laboratory experiment is suggested in which conditions similar to those in the plume ejecta from Enceladus and, perhaps, Europa are established. With the use of infrared spectroscopy and polarimetry, the experiment might identify possible biomarkers in differential measurements of water from the open ocean, hydrothermal vents, and abiotic water samples. Should the experiment succeed, large telescopes could be used to acquire sensitive infrared spectra of the plumes of Enceladus and Europa, as the satellites transit the bright planetary disks...
September 2017: Astrobiology
https://www.readbyqxmd.com/read/28856035/mueller-matrix-polarimetry-for-characterizing-microstructural-variation-of-nude-mouse-skin-during-tissue-optical-clearing
#3
Dongsheng Chen, Nan Zeng, Qiaolin Xie, Honghui He, Valery V Tuchin, Hui Ma
We investigate the polarization features corresponding to changes in the microstructure of nude mouse skin during immersion in a glycerol solution. By comparing the Mueller matrix imaging experiments and Monte Carlo simulations, we examine in detail how the Mueller matrix elements vary with the immersion time. The results indicate that the polarization features represented by Mueller matrix elements m22&m33&m44 and the absolute values of m34&m43 are sensitive to the immersion time. To gain a deeper insight on how the microstructures of the skin vary during the tissue optical clearing (TOC), we set up a sphere-cylinder birefringence model (SCBM) of the skin and carry on simulations corresponding to different TOC mechanisms...
August 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28853246/use-of-mueller-matrix-polarimetry-and-optical-coherence-tomography-in-the-characterization-of-cervical-collagen-anisotropy
#4
Joseph Chue-Sang, Yuqiang Bai, Susan Stoff, Mariacarla Gonzalez, Nola Holness, Jefferson Gomes, Ranu Jung, Amir Gandjbakhche, Viktor V Chernomordik, Jessica C Ramella-Roman
Preterm birth (PTB) presents a serious medical health concern throughout the world. There is a high incidence of PTB in both developed and developing countries ranging from 11% to 15%, respectively. Recent research has shown that cervical collagen orientation and distribution changes during pregnancy may be useful in predicting PTB. Polarization imaging is an effective means to measure optical anisotropy in birefringent materials, such as the cervix's extracellular matrix. Noninvasive, full-field Mueller matrix polarimetry (MMP) imaging methodologies, and optical coherence tomography (OCT) imaging were used to assess cervical collagen content and structure in nonpregnant porcine cervices...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28836417/second-harmonic-patterned-polarization-analyzed-reflection-confocal-microscope
#5
Chukwuemeka Okoro, Kimani C Toussaint
We introduce the second-harmonic patterned polarization-analyzed reflection confocal (SPPARC) microscope-a multimodal imaging platform that integrates Mueller matrix polarimetry with reflection confocal and second-harmonic generation (SHG) microscopy. SPPARC microscopy provides label-free three-dimensional (3-D), SHG-patterned confocal images that lend themselves to spatially dependent, linear polarimetric analysis for extraction of rich polarization information based on the Mueller calculus. To demonstrate its capabilities, we use SPPARC microscopy to analyze both porcine tendon and ligament samples and find differences in both circular degree-of-polarization and depolarization parameters...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28827645/micron-scale-mapping-of-megagauss-magnetic-fields-using-optical-polarimetry-to-probe-hot-electron-transport-in-petawatt-class-laser-solid-interactions
#6
Gourab Chatterjee, Prashant Kumar Singh, A P L Robinson, D Blackman, N Booth, O Culfa, R J Dance, L A Gizzi, R J Gray, J S Green, P Koester, G Ravindra Kumar, L Labate, Amit D Lad, K L Lancaster, J Pasley, N C Woolsey, P P Rajeev
The transport of hot, relativistic electrons produced by the interaction of an intense petawatt laser pulse with a solid has garnered interest due to its potential application in the development of innovative x-ray sources and ion-acceleration schemes. We report on spatially and temporally resolved measurements of megagauss magnetic fields at the rear of a 50-μm thick plastic target, irradiated by a multi-picosecond petawatt laser pulse at an incident intensity of ~10(20) W/cm(2). The pump-probe polarimetric measurements with micron-scale spatial resolution reveal the dynamics of the magnetic fields generated by the hot electron distribution at the target rear...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811075/regulatory-t-cell-deficient-scurfy-mice-exhibit-a-th2-m2-like-inflammatory-response-in-the-skin
#7
Stefanie Haeberle, Verena Raker, Jessica Haub, Yong O Kim, Shih-Yen Weng, Osman K Yilmaz, Alexander Enk, Kerstin Steinbrink, Detlef Schuppan, Eva N Hadaschik
BACKGROUND: Scurfy mice have a functional defect in regulatory T cells (Treg), which leads to lethal multi-organ inflammation. The missing Treg function results in uncontrolled autoimmune cellular and humoral inflammatory responses. We and others have previously shown that during the course of disease scurfy mice develop severe skin inflammation and autoantibodies including anti-nuclear autoantibodies (ANA). OBJECTIVE: Autoimmune skin inflammation and ANA are hallmarks for the diagnosis of autoimmune connective tissue diseases; therefore we analyzed scurfy mice for typical signs of these diseases...
September 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28798398/shedding-new-light-on-the-crab-with-polarized-x-rays
#8
M Chauvin, H-G Florén, M Friis, M Jackson, T Kamae, J Kataoka, T Kawano, M Kiss, V Mikhalev, T Mizuno, N Ohashi, T Stana, H Tajima, H Takahashi, N Uchida, M Pearce
Strong magnetic fields, synchrotron emission, and Compton scattering are omnipresent in compact celestial X-ray sources. Emissions in the X-ray energy band are consequently expected to be linearly polarized. X-ray polarimetry provides a unique diagnostic to study the location and fundamental mechanisms behind emission processes. The polarization of emissions from a bright celestial X-ray source, the Crab, is reported here for the first time in the hard X-ray band (~20-160 keV). The Crab is a complex system consisting of a central pulsar, a diffuse pulsar wind nebula, as well as structures in the inner nebula including a jet and torus...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28766256/synthesis-insecticidal-activities-and-structure-activity-relationship-study-of-dual-chiral-sulfilimines
#9
Sha Zhou, Xiangde Meng, Ruyi Jin, Yi Ma, Yongtao Xie, Yu Zhao, Hongjian Song, Lixia Xiong, Zhengming Li
To investigate the "methyl" impact on bioactivity of sulfiliminyl dicarboxamides, a total of 16 novel N-cyano and N-trifluoroacetyl sulfiliminyl dicarboxamides containing m-heptafluoroisopropylated aromatic amino moiety were studied. Two series of sulfiliminyl substituents were designed, synthesized and evaluated against oriental armyworm (Pseudaletia separata Walker) for their insecticidal activities. Their chemical structures were established by corresponding [Formula: see text] NMR, HRMS and optical polarimetry...
August 1, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28753336/beam-recoil-polarization-measurement-of-%C3%AF-0-electroproduction-on-the-proton-in-the-region-of-the-roper-resonance
#10
S Štajner, P Achenbach, T Beranek, J Beričič, J C Bernauer, D Bosnar, R Böhm, L Correa, A Denig, M O Distler, A Esser, H Fonvieille, J M Friedrich, I Friščić, S Kegel, Y Kohl, H Merkel, M Mihovilovič, J Müller, U Müller, L Nungesser, J Pochodzalla, B S Schlimme, M Schoth, F Schulz, C Sfienti, S Širca, M Thiel, L Tiator, A Tyukin, A Weber, I Yaron
The helicity-dependent recoil proton polarizations P_{x}^{'} and P_{z}^{'} as well as the helicity-independent component P_{y} have been measured in the p(e[over →],e^{'}p[over →])π^{0} reaction at four-momentum transfer Q^{2}≃0.1  GeV^{2}, center-of-mass proton emission angle θ_{p}^{*}≃90°, and invariant mass W≃1440  MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P_{11}(1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q^{2}, establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon...
July 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28732286/development-of-liquid-chromatographic-methods-for-enantioseparation-and-sensitive-detection-of-%C3%AE-adrenolytics-%C3%AE-2-agonists-in-human-plasma-using-a-single-enantiomer-reagent
#11
Poonam Malik, Ravi Bhushan
Enantioseparation of four commonly used β-adrenolytics (bisoprolol, salbutamol, and carvedilol, marketed as racemic mixtures) has been achieved by both TLC and RPHPLC via an indirect approach. A new chiral reagent, (S)-naproxen benzotriazole ester, was synthesized and it was characterized by UV, IR, (1)HNMR, elemental analysis and polarimetry. It was used to synthesize diastereomeric derivatives of the three β-adrenolytics under microwave irradiation. TLC separation of diastereomeric derivatives was achieved which were then isolated by preparative approach; these were characterized and were used as standard reference for determining absolute configuration of diastereomeric derivatives and for establishing validated HPLC method for enantioseparation and sensitive detection of the three β-adrenolytics in human plasma...
July 14, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28727836/the-disc-damage-likelihood-scale-diagnostic-accuracy-and-correlations-with-cup-to-disc-ratio-structural-tests-and-standard-automated-perimetry
#12
Andrea C Kara-José, Luiz Alberto S Melo, Bruno L B Esporcatte, Angelica T N H Endo, Mauro Toledo Leite, Ivan Maynart Tavares
Our objective was to compare the diagnostic accuracies of and to determine the correlations between the disc damage likelihood scale (DDLS) and anatomical and functional tests used for glaucoma detection. A total of 54 healthy subjects (54 eyes) and 47 primary open-angle glaucoma patients (47 eyes) were included in this cross-sectional observational study. DDLS scores and cup-to-disc (C/D) ratios were evaluated. Subjects underwent standard automated perimetry (SAP), optic disc and retinal nerve fiber layer (RNFL) imaging with time and spectral-domain optical coherence tomography (TD and SD-OCT), Heidelberg Retina Tomograph (HRT II), and scanning laser polarimetry (GDx-VCC)...
2017: PloS One
https://www.readbyqxmd.com/read/28706282/retinal-degeneration-in-progressive-supranuclear-palsy-measured-by-optical-coherence-tomography-and-scanning-laser-polarimetry
#13
Birthe Stemplewitz, Robert Kromer, Eik Vettorazzi, Ute Hidding, Andreas Frings, Carsten Buhmann
This cross-sectional study compared the retinal morphology between patients with progressive supranuclear palsy (PSP) and healthy controls. (The retinal nerve fiber layer (RNFL) around the optic disc and the retina in the macular area of 22 PSP patients and 151 controls were investigated by spectral domain optical coherence tomography (SD-OCT). Additionally, the RNFL and the nerve fiber index (NFI) were measured by scanning laser polarimetry (SLP). Results of RNFL measurements with SD-OCT and SLP were compared to assess diagnostic discriminatory power...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28684356/sauromatum-guttatum-lectin-spectral-studies-lectin-carbohydrate-interaction-molecular-cloning-and-in-silico-analysis
#14
Kshema Thakur, Tarnjeet Kaur, Jatinder Singh, Gulam Rabbani, Rizwan H Khan, Rachna Hora, Manpreet Kaur
Non-immune carbohydrate binding proteins are broadly defined as lectins. Having been reported from all kingdoms of life, phytolectins are the most widely studied group of lectins. Sauromatum guttatum agglutinin (SGA) was isolated from the plant tubers and characterized for structural variations due to solvent perturbation using polarimetry, fluorescence and light scattering. For the β-sheet rich SGA, a pH and temperature induced molten globule like intermediate was identified. In isothermal titration microcalorimetry, SGA demonstrated cooperative binding to a complex glycoprotein in enthalpically driven mechanism...
November 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28682302/precise-characterization-of-self-catalyzed-iii-v-nanowire-heterostructures-via-optical-second-harmonic-generation
#15
Ying Yu, Jing Wang, Yu-Ming Wei, Zhang-Kai Zhou, Hai-Qiao Ni, Zhi-Chuan Niu, Xue-Hua Wang, Si-Yuan Yu
We demonstrate the utility of optical second harmonic generation (SHG) polarimetry to perform structural characterization of self-assembled zinc-blende/wurtzite III-V nanowire heterostructures. By analyzing four anisotropic SHG polarimetric patterns, we distinguish between wurtzite (WZ), zinc-blende (ZB) and ZB/WZ mixing III-V semiconducting crystal structures in nanowire systems. By neglecting the surface contributions and treating the bulk crystal within the quasi-static approximation, we can well explain the optical SHG polarimetry from the NWs with diameter from 200-600 nm...
July 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28676874/chiroptical-properties-of-cryptophane-111
#16
Thierry Buffeteau, Delphine Pitrat, Nicolas Daugey, Nathalie Calin, Marion Jean, Nicolas Vanthuyne, Laurent Ducasse, Frank Wien, Thierry Brotin
The two enantiomers of cryptophane-111 (1), which possesses the most simplified chemical structure of cryptophane derivatives and exhibits the highest binding constant for xenon encapsulation in organic solution, were separated by HPLC using chiral stationary phases. The chiroptical properties of [CD(+)254]-1 and [CD(-)254]-1 were determined in CH2Cl2 and CHCl3 solutions by polarimetry, electronic circular dichroism (ECD), vibrational circular dichroism (VCD), and Raman optical activity (ROA) experiments and were compared to those of cryptophane-222 (2) derivative...
July 5, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28652701/follow-up-of-the-retinal-nerve-fiber-layer-thickness-of-diabetic-patients-type-2-as-a-predisposing-factor-for-glaucoma-compared-to-normal-subjects
#17
Alexandros Takis, Dimitrios Alonistiotis, Nikolaos Ioannou, Evgenia Kontou, Maria Mitsopoulou, Dimitrios Papaconstantinou
PURPOSE: To evaluate and follow-up the retinal nerve fiber layer (RNFL) thickness in patients with diabetes mellitus type 2 compared to a group of healthy individuals with similar demographic characteristics. PATIENTS AND METHODS: This is a prospective, noninvasive, observational case series study. For the purposes of the study, 27 eyes of diabetic patients without diabetic retinopathy, 24 eyes of patients with mild retinopathy, and 25 normal age-matched subjects (control group [CG]) were examined...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28624539/polarization-resolved-second-harmonic-microscopy
#18
REVIEW
Nirmal Mazumder, Gitanjal Deka, Wei-Wen Wu, Ankur Gogoi, Guan-Yu Zhuo, Fu-Jen Kao
Second harmonic (SH) microscopy has proven to be a powerful imaging modality over the past years due to its intrinsic advantages as a multiphoton process with endogenous contrast specificity, which allows pinhole-less optical sectioning, non-invasive observation, deep tissue penetration, and the possibility of easier signal detection at visible wavelengths. Depending on the relative orientation between the polarization of the incoming light and the second-order susceptibility of non-centrosymmetric structures, SH microscopy provides the unique capacity to probe the absolute molecular structure of a broad variety of biological tissues without the necessity for additional labeling...
September 1, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28614332/dynamics-of-trapped-atoms-around-an-optical-nanofiber-probed-through-polarimetry
#19
Pablo Solano, Fredrik K Fatemi, Luis A Orozco, S L Rolston
The evanescent field outside an optical nanofiber (ONF) can create optical traps for neutral atoms. We present a non-destructive method to characterize such trapping potentials. An off-resonance linearly polarized probe beam that propagates through the ONF experiences a slow axis of polarization produced by trapped atoms on opposite sides along the ONF. The transverse atomic motion is imprinted onto the probe polarization through the changing atomic index of refraction. By applying a transient impulse, we measure a time-dependent polarization rotation of the probe beam that provides both a rapid and non-destructive measurement of the optical trapping frequencies...
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28600515/evaluation-of-intraretinal-migration-of-retinal-pigment-epithelial-cells-in-age-related-macular-degeneration-using-polarimetric-imaging
#20
Masahiro Miura, Shuichi Makita, Satoshi Sugiyama, Young-Joo Hong, Yoshiaki Yasuno, Ann E Elsner, Shigeo Tamiya, Rintaro Tsukahara, Takuya Iwasaki, Hiroshi Goto
The purpose of the present study was to evaluate the intraretinal migration of the retinal pigment epithelium (RPE) cells in age-related macular degeneration (AMD) using polarimetry. We evaluated 155 eyes at various AMD stages. Depolarized light images were computed using a polarization-sensitive scanning laser ophthalmoscope (PS-SLO), and the degree of polarization uniformity was calculated using polarization-sensitive optical coherence tomography (OCT). Each polarimetry image was compared with the corresponding autofluorescence (AF) images at 488 nm (SW-AF) and at 787 nm (NIR-AF)...
June 9, 2017: Scientific Reports
keyword
keyword
37478
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"