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https://www.readbyqxmd.com/read/28220855/extending-calibration-free-force-measurements-to-optically-trapped-rod-shaped-samples
#1
Frederic Català, Ferran Marsà, Mario Montes-Usategui, Arnau Farré, Estela Martín-Badosa
Optical trapping has become an optimal choice for biological research at the microscale due to its non-invasive performance and accessibility for quantitative studies, especially on the forces involved in biological processes. However, reliable force measurements depend on the calibration of the optical traps, which is different for each experiment and hence requires high control of the local variables, especially of the trapped object geometry. Many biological samples have an elongated, rod-like shape, such as chromosomes, intracellular organelles (e...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28218254/large-metasurface-aperture-for-millimeter-wave-computational-imaging-at-the-human-scale
#2
J N Gollub, O Yurduseven, K P Trofatter, D Arnitz, M F Imani, T Sleasman, M Boyarsky, A Rose, A Pedross-Engel, H Odabasi, T Zvolensky, G Lipworth, D Brady, D L Marks, M S Reynolds, D R Smith
We demonstrate a low-profile holographic imaging system at millimeter wavelengths based on an aperture composed of frequency-diverse metasurfaces. Utilizing measurements of spatially-diverse field patterns, diffraction-limited images of human-sized subjects are reconstructed. The system is driven by a single microwave source swept over a band of frequencies (17.5-26.5 GHz) and switched between a collection of transmit and receive metasurface panels. High fidelity image reconstruction requires a precise model for each field pattern generated by the aperture, as well as the manner in which the field scatters from objects in the scene...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195413/holographic-structuring-of-elastomer-actuator-first-true-monolithic-tunable-elastomer-optics
#3
Alexander Ryabchun, Matthias Kollosche, Michael Wegener, Oksana Sakhno
No abstract text is available yet for this article.
February 2017: Advanced Materials
https://www.readbyqxmd.com/read/28186796/from-planck-data-to-planck-era-observational-tests-of-holographic-cosmology
#4
Niayesh Afshordi, Claudio Corianò, Luigi Delle Rose, Elizabeth Gould, Kostas Skenderis
We test a class of holographic models for the very early Universe against cosmological observations and find that they are competitive to the standard cold dark matter model with a cosmological constant (ΛCDM) of cosmology. These models are based on three-dimensional perturbative superrenormalizable quantum field theory (QFT), and, while they predict a different power spectrum from the standard power law used in ΛCDM, they still provide an excellent fit to the data (within their regime of validity). By comparing the Bayesian evidence for the models, we find that ΛCDM does a better job globally, while the holographic models provide a (marginally) better fit to the data without very low multipoles (i...
January 27, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28164445/holographic-optical-tweezers-based-in-vivo-manipulations-in-zebrafish-embryos
#5
Florian Hörner, Robert Meissner, Sruthi Polali, Jana Pfeiffer, Timo Betz, Cornelia Denz, Erez Raz
Understanding embryonic development requires the characterization of the forces and the mechanical features that shape cells and tissues within the organism. In addition, experimental application of forces on cells and altering cell and organelle shape allows determining the role such forces play in morphogenesis. Here, we present a holographic optical tweezers-based new microscopic platform for in vivo applications in the context of a developing vertebrate embryo that unlike currently used setups allows simultaneous trapping of multiple objects and rapid comparisons of viscoelastic properties in different locations...
February 6, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28158083/holographic-microinformation-hiding
#6
Tomoyoshi Shimobaba, Yutaka Endo, Ryuji Hirayama, Daisuke Hiyama, Yuki Nagahama, Satoki Hasegawa, Marie Sano, Takayuki Takahashi, Takashi Kakue, Minoru Oikawa, Tomoyoshi Ito
We propose a holographic microinformation hiding scheme in which the embedding information to be embedded is small and imperceptible to the human eyes. This scheme converts the embedding information into a complex amplitude via scaled diffraction. The complex amplitude of the reduced embedding information is added to the complex amplitude of the host image, followed by conversion to a hologram. The reduced embedded information is inconspicuous from the hologram during the reconstruction process; however, the reduction leads to the degradation of the embedded image quality...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28158016/digital-super-resolution-holographic-data-storage-based-on-hermitian-symmetry-for-achieving-high-areal-density
#7
Teruyoshi Nobukawa, Takanori Nomura
Digital super-resolution holographic data storage based on Hermitian symmetry is proposed to store digital data in a tiny area of a medium. In general, reducing a recording area with an aperture leads to the improvement in the storage capacity of holographic data storage. Conventional holographic data storage systems however have a limitation in reducing a recording area. This limitation is called a Nyquist size. Unlike the conventional systems, our proposed system can overcome the limitation with the help of a digital holographic technique and digital signal processing...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157996/multiview-holographic-3d-dynamic-display-by-combining-a-nano-grating-patterned-phase-plate-and-lcd
#8
Wenqiang Wan, Wen Qiao, Wenbin Huang, Ming Zhu, Yan Ye, Xiangyu Chen, Linsen Chen
Limited by the refreshable data volume of commercial spatial light modulator (SLM), electronic holography can hardly provide satisfactory 3D live video. Here we propose a holography based multiview 3D display by separating the phase information of a lightfield from the amplitude information. In this paper, the phase information was recorded by a 5.5-inch 4-view phase plate with a full coverage of pixelated nano-grating arrays. Because only amplitude information need to be updated, the refreshing data volume in a 3D video display was significantly reduced...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157342/holography-of-the-dirac-fluid-in-graphene-with-two-currents
#9
Yunseok Seo, Geunho Song, Philip Kim, Subir Sachdev, Sang-Jin Sin
Recent experiments have uncovered evidence of the strongly coupled nature of graphene: the Wiedemann-Franz law is violated by up to a factor of 20 near the charge neutral point. We describe this strongly coupled plasma by a holographic model in which there are two distinct conserved U(1) currents. We find that our analytic results for the transport coefficients for the two current model have a significantly improved match to the density dependence of the experimental data than the models with only one current...
January 20, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28155267/flexible-heteroepitaxy-of-cofe2o4-muscovite-bimorph-with-large-magnetostriction
#10
Heng-Jui Liu, Chih-Kuo Wang, Dong Su, Tahta Amrillah, Ying-Hui Hsieh, Kun-Hong Wu, Yi-Chun Chen, Jenh-Yih Juang, Lukas M Eng, Shien-Uang Jen, Ying-Hao Chu
A bimorph composed of ferrimagnetic cobalt ferrite (CoFe2O4, CFO) and flexible muscovite was fabricated via van der Waals epitaxy. The combination of x-ray diffraction and transmission electron microscopy was conducted to reveal the heteroepitaxy of CFO/muscovite system. The robust magnetic behaviors against mechanical bending were characterized by hysteresis measurements and magnetic force microscopy, which remain a saturation magnetization (Ms) of ~120-150 emu/cm3 under different bending states. The large magnetostrictive response of the CFO film was then determined by digital holographic microscopy, where the difference of magnetostrction coefficient (Δλ) is -104 ppm...
February 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28128979/studies-of-staphylococcus-aureus-fabi-inhibitors-fragment-based-approach-based-on-holographic-structure-activity-relationship-analyses
#11
Thales Kronenberger, Leonardo Rander Asse, Carsten Wrenger, Gustavo Henrique Goulart Trossini, Kathia Maria Honorio, Vinicius Gonçalves Maltarollo
AIM: FabI is a key enzyme in the fatty acid metabolism of Gram-positive bacteria such as Staphylococcus aureus and is an established drug target for known antibiotics such as triclosan. However, due to increasing antibacterial resistance, there is an urgent demand for new drug discovery. Recently, aminopyridine derivatives have been proposed as promising competitive inhibitors of FabI. METHODS: In the present study, holographic structure-activity relationship (HQSAR) analyses were employed for determining structural contributions of a series containing 105 FabI inhibitors...
January 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/28128024/studies-of-staphylococcus-aureus-fabi-inhibitors-fragment-based-approach-based-on-holographic-structure-activity-relationship-analyses
#12
Thales Kronenberger, Leonardo Rander Asse, Carsten Wrenger, Gustavo Henrique Goulart Trossini, Kathia Maria Honorio, Vinicius Gonçalves Maltarollo
AIM: FabI is a key enzyme in the fatty acid metabolism of Gram-positive bacteria such as Staphylococcus aureus and is an established drug target for known antibiotics such as triclosan. However, due to increasing antibacterial resistance, there is an urgent demand for new drug discovery. Recently, aminopyridine derivatives have been proposed as promising competitive inhibitors of FabI. METHODS: In the present study, holographic structure-activity relationship (HQSAR) analyses were employed for determining structural contributions of a series containing 105 FabI inhibitors...
January 27, 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/28119550/using-wire-shaping-techniques-and-holographic-optics-to-optimize-deposition-characteristics-in-wire-based-laser-cladding
#13
N J Goffin, R L Higginson, J R Tyrer
In laser cladding, the potential benefits of wire feeding are considerable. Typical problems with the use of powder, such as gas entrapment, sub-100% material density and low deposition rate are all avoided with the use of wire. However, the use of a powder-based source material is the industry standard, with wire-based deposition generally regarded as an academic curiosity. This is because, although wire-based methods have been shown to be capable of superior quality results, the wire-based process is more difficult to control...
December 2016: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28117428/focusing-and-alignment-of-erythrocytes-in-a-viscoelastic-medium
#14
Taesik Go, Hyeokjun Byeon, Sang Joon Lee
Viscoelastic fluid flow-induced cross-streamline migration has recently received considerable attention because this process provides simple focusing and alignment over a wide range of flow rates. The lateral migration of particles depends on the channel geometry and physicochemical properties of particles. In this study, digital in-line holographic microscopy (DIHM) is employed to investigate the lateral migration of human erythrocytes induced by viscoelastic fluid flow in a rectangular microchannel. DIHM provides 3D spatial distributions of particles and information on particle orientation in the microchannel...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28117346/holographic-image-generation-with-a-thin-film-resonance-caused-by-chalcogenide-phase-change-material
#15
Seung-Yeol Lee, Yong-Hae Kim, Seong-M Cho, Gi Heon Kim, Tae-Youb Kim, Hojun Ryu, Han Na Kim, Han Byeol Kang, Chi-Young Hwang, Chi-Sun Hwang
The development of digital holography is anticipated for the viewing of 3D images by reconstructing both the amplitude and phase information of the object. Compared to analog holograms written by a laser interference, digital hologram technology has the potential to realize a moving 3D image using a spatial light modulator. However, to ensure a high-resolution 3D image with a large viewing angle, the hologram panel requires a near-wavelength scale pixel pitch with a sufficient large numbers of pixels. In this manuscript, we demonstrate a digital hologram panel based on a chalcogenide phase-change material (PCM) which has a pixel pitch of 1 μm and a panel size of 1...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28081471/in-situ-morphological-assessment-of-apoptosis-induced-by-phaleria-macrocarpa-boerl-fruit-ethyl-acetate-fraction-pmeaf-in-mda-mb-231-cells-by-microscopy-observation
#16
Nowroji Kavitha, Yeng Chen, Jagat R Kanwar, Sreenivasan Sasidharan
Phaleria macrocarpa (Boerl.) is a well-known medicinal plant and have been extensively used as traditional medicine for ages in treatment of various diseases. The purpose of this study was to determine the in situ cytotoxicity effect P. macrocarpa fruit ethyl acetate fraction (PMEAF) by using various conventional and modern microscopy techniques. The cytotoxicity of PMEAF treated MDA-MB-231 cells was determined through the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) cytotoxicity assay and CyQuant Cell Proliferation Assay after 24h of treatment...
March 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28081110/light-sheet-microscopy-in-a-glass-capillary-feedback-holographic-control-for-illumination-beam-correction
#17
Tobias Meinert, Benjamin Alexander Gutwein, Alexander Rohrbach
Light-sheet microscopy enables fast 3D, high-contrast imaging in biology and colloidal sciences. Recently, the controlled transport of living embryos or small colloids through stable glass capillaries is manifold interesting. Although they hardly impair the sample, glass capillaries spoil the image by generating significant aberrations of the illumination and detection light. Here, we analyze the deflection of illuminating Bessel beams at the capillary by k-spectral shifting, and correct for it by a beam deflector...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28081109/non-axial-scanning-multifocal-confocal-microscopy-with-multiplexed-volume-holographic-gratings
#18
Po-Hao Wang, Vijay Raj Singh, Jau-Min Wong, Kung-Bin Sung, Yuan Luo
Confocal imaging techniques offer an optical sectioning capability to acquire three-dimensional information from various volumetric samples by discriminating the desired in-focus signals from the out-of-focus background. However, confocal, in general, requires a point-by-point scan in both the lateral and axial directions to reconstruct three-dimensional images. In addition, axial scanning in confocal is slower than scanning in lateral directions. In this Letter, a non-axial-scanning multifocal confocal microscope incorporating multiplexed holographic gratings in illumination and dual detection for depth discrimination is presented...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28081103/robust-processing-of-phase-dislocations-based-on-combined-unwrapping-and-inpainting-approaches
#19
Haiting Xia, Silvio Montresor, Rongxin Guo, Junchang Li, François Olchewsky, Jean-Michel Desse, Pascal Picart
This Letter proposes a robust processing of phase dislocations to recover continuous phase maps. The approach is based on combined unwrapping and inpainting methods. Phase dislocations are determined using an estimator based on the second order phase gradient. The algorithm is validated using a realistic simulation of phase dislocations, and the phase restoration exhibits only weak errors. A comparison with other inpainting algorithms is also provided, demonstrating the suitability of the approach. The approach is applied to experimental data from off-axis digital holographic interferometry...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28081091/refocus-criterion-based-on-maximization-of-the-coherence-factor-in-digital-three-wavelength-holographic-interferometry
#20
Pascal Picart, Silvio Montresor, Oleksandr Sakharuk, Leonid Muravsky
This Letter presents an alternative approach for image refocusing in digital Fresnel holography. In the literature, a large majority of reported focus detection criteria is based on amplitude contrast or phase contrast. We propose a focus detection criterion based on the speckle phase coherence factor. This factor reaches its maximum value at the best focus distance. At any reconstruction distance, estimation of the coherence factor is based on robust noise estimation from anisotropic diffusion. We propose a theoretical relation to estimate the coherence factor from the measured standard deviation...
January 15, 2017: Optics Letters
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