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Light sheet microscopy

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https://www.readbyqxmd.com/read/29768905/improved-visible-light-induced-photocatalytic-performance-of-znal-layered-double-hydroxide-by-incorporation-of-ni-2
#1
Min Qi, Lihui Fan, Yanming Shen, Hong Zou, Xiaolu Tian, Dongbin Liu, Shifeng Li
NiZnAl layered double hydroxides (LDH) with Ni/Zn/Al ratios ranging from 0.1/2/1 to 1/2/1 were papered by coprecipitation. The prepared samples were characterized by multiple techniques including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse-reflectance spectroscopy (UV-vis DRS). The incorporation of Ni2+ into the brucite sheets preserves the layered structure of ZnAl LDH...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768202/sensory-neuropathy-causing-mutations-in-atl3-cause-aberrant-er-membrane-tethering
#2
Michiel Krols, Sammy Detry, Bob Asselbergh, Leonardo Almeida-Souza, Anna Kremer, Saskia Lippens, Riet De Rycke, Vicky De Winter, Franz-Josef Müller, Ingo Kurth, Harvey T McMahon, Savvas N Savvides, Vincent Timmerman, Sophie Janssens
The endoplasmic reticulum (ER) is a complex network of sheets and tubules that is continuously remodeled. The relevance of this membrane dynamics is underscored by the fact that mutations in atlastins (ATLs), the ER fusion proteins in mammals, cause neurodegeneration. How defects in this process disrupt neuronal homeostasis is unclear. Using electron microscopy (EM) volume reconstruction of transfected cells, neurons, and patient fibroblasts, we show that hereditary sensory and autonomic neuropathy (HSAN)-causing ATL3 mutants promote aberrant ER tethering hallmarked by bundles of laterally attached ER tubules...
May 15, 2018: Cell Reports
https://www.readbyqxmd.com/read/29760977/fast-volume-scanning-light-sheet-microscopy-reveals-transient-neuronal-events
#3
Peter Haslehurst, Zhengyi Yang, Kishan Dholakia, Nigel Emptage
Light sheet fluorescence microscopy offers considerable potential to the cellular neuroscience community as it makes it possible to image extensive areas of neuronal structures, such as axons or dendrites, with a low light budget, thereby minimizing phototoxicity. However, the shallow depth of a light sheet, which is critical for achieving high contrast, well resolved images, adds a significant challenge if fast functional imaging is also required, as multiple images need to be collected across several image planes...
May 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29752956/advanced-microscopy-to-elucidate-cardiovascular-injury-and-regeneration-4d-light-sheet-imaging
#4
REVIEW
Kyung In Baek, Yichen Ding, Chih-Chiang Chang, Megan Chang, René R Sevag Packard, Jeffrey J Hsu, Peng Fei, Tzung K Hsiai
The advent of 4-dimensional (4D) light-sheet fluorescence microscopy (LSFM) has provided an entry point for rapid image acquisition to uncover real-time cardiovascular structure and function with high axial resolution and minimal photo-bleaching/-toxicity. We hereby review the fundamental principles of our LSFM system to investigate cardiovascular morphogenesis and regeneration after injury. LSFM enables us to reveal the micro-circulation of blood cells in the zebrafish embryo and assess cardiac ventricular remodeling in response to chemotherapy-induced injury using an automated segmentation approach...
May 9, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29750281/an-orthotopic-glioblastoma-animal-model-suitable-for-high-throughput-screenings
#5
Linda Pudelko, Steven Edwards, Mirela Balan, Daniel Nyqvist, Jonathan Al-Saadi, Johannes Dittmer, Ingrid Almlöf, Thomas Helleday, Lars Bräutigam
Background: Glioblastoma (GBM) is an aggressive form of brain cancer with poor prognosis. Although murine animal models have given valuable insights into the GBM disease biology, they cannot be used in high-throughput screens to identify and profile novel therapies. The only vertebrate model suitable for large-scale screens, the zebrafish, has proven to faithfully recapitulate biology and pathology of human malignancies and clinically relevant orthotopic zebrafish models have been developed...
May 10, 2018: Neuro-oncology
https://www.readbyqxmd.com/read/29750130/light-sheet-microscopy-for-slide-free-non-destructive-pathology-of-large-clinical-specimens
#6
Adam K Glaser, Nicholas P Reder, Ye Chen, Erin F McCarty, Chengbo Yin, Linpeng Wei, Yu Wang, Lawrence D True, Jonathan T C Liu
For the 1.7 million patients per year in the U.S. who receive a new cancer diagnosis, treatment decisions are largely made after a histopathology exam. Unfortunately, the gold standard of slide-based microscopic pathology suffers from high inter-observer variability and limited prognostic value due to sampling limitations and the inability to visualize tissue structures and molecular targets in their native 3D context. Here, we show that an open-top light-sheet microscope optimized for non-destructive slide-free pathology of clinical specimens enables the rapid imaging of intact tissues at high resolution over large 2D and 3D fields of view, with the same level of detail as traditional pathology...
July 2017: Nature Biomedical Engineering
https://www.readbyqxmd.com/read/29744826/methods-to-characterize-the-nanostructure-and-molecular-organization-of-amphiphilic-peptide-assemblies
#7
V Castelletto, I W Hamley
Methods to characterize the nanostructure and molecular organization of aggregates of peptides such as amyloid or amphiphilic peptide assemblies are reviewed. We discuss techniques to characterize conformation and secondary structure including circular and linear dichroism and FTIR and Raman spectroscopies, as well as fluorescence methods to detect aggregation. NMR spectroscopy methods, especially solid-state NMR measurements to probe beta-sheet packing motifs, are also briefly outlined. Also discussed are scattering methods including X-ray diffraction and small-angle scattering techniques including SAXS (small-angle X-ray scattering) and SANS (small-angle neutron scattering) and dynamic light scattering...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29742413/single-molecule-light-sheet-imaging-of-suspended-t-cells
#8
Aleks Ponjavic, James McColl, Alexander R Carr, Ana Mafalda Santos, Klara Kulenkampff, Anna Lippert, Simon J Davis, David Klenerman, Steven F Lee
Adaptive immune responses are initiated by triggering of the T cell receptor. Single-molecule imaging based on total internal reflection fluorescence microscopy at coverslip/basal cell interfaces is commonly used to study this process. These experiments have suggested, unexpectedly, that the diffusional behavior and organization of signaling proteins and receptors may be constrained before activation. However, it is unclear to what extent the molecular behavior and cell state is affected by the imaging conditions, i...
May 8, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29740614/light-sheet-microscopy-with-attenuation-compensated-propagation-invariant-beams
#9
Jonathan Nylk, Kaley McCluskey, Miguel A Preciado, Michael Mazilu, Zhengyi Yang, Frank J Gunn-Moore, Sanya Aggarwal, Javier A Tello, David E K Ferrier, Kishan Dholakia
Scattering and absorption limit the penetration of optical fields into tissue. We demonstrate a new approach for increased depth penetration in light-sheet microscopy: attenuation-compensation of the light field. This tailors an exponential intensity increase along the illuminating propagation-invariant field, enabling the redistribution of intensity strategically within a sample to maximize signal and minimize irradiation. A key attribute of this method is that only minimal knowledge of the specimen transmission properties is required...
April 2018: Science Advances
https://www.readbyqxmd.com/read/29737305/highly-visible-light-responsive-cu2o-rgo-decorated-with-fe3o4-sio2-nanoparticles-as-a-magnetically-recyclable-photocatalyst
#10
Shou-Heng Liu, Jun-Sheng Lu, Sheng-Wei Yang
The rhombic dodecahedral cuprous oxide-reduced graphene oxide/core shell Fe3O4@SiO2 composites (denoted as rCu2O-rGO/Fe3O4@SiO2) are successfully synthesized facilely via a wet-chemical route. The resulting rCu2O-rGO/Fe3O4@SiO2 combines unique structure of Cu2O, electronic characteristics of rGO and the magnetic property of Fe3O4@SiO2 to be an effective and recoverable photocatalyst for degradation of methyl orange (MO). The obtained results show that rCu2O-rGO/Fe3O4@SiO2 is capable of completely degrading MO in the presence of very low catalyst concentration (0...
May 8, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29733571/aggregation-induced-emission-aie-dots-emerging-theranostic-nanolights
#11
Guangxue Feng, Bin Liu
Theranostic nanolights refer to luminescent nanoparticles possessing both imaging and therapeutic functions. Their shape, size, surface functions, and optical properties can be precisely manipulated through integrated efforts of chemistry, materials, and nanotechnology for customized applications. When localized photons are used to activate both imaging and therapeutic functions such as photodynamic or photothermal therapy, these theranostic nanolights increase treatment efficacy with minimized damage to surrounding healthy tissues, which represents a promising noninvasive nanomedicine as compared to conventional theranostic approaches...
May 7, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29727655/human-insulin-fibrillogenesis-in-the-presence-of-epigallocatechin-gallate-and-melatonin-structural-insights-from-a-biophysical-approach
#12
M Carbonaro, F Ripanti, A Filabozzi, V Minicozzi, F Stellato, E Placidi, S Morante, A Di Venere, E Nicolai, P Postorino, A Nucara
Fibrillogenesis of monomeric human insulin in the presence or absence of (-)-epigallocatechin-3-gallate and melatonin was here investigated using a multi-technique approach. Results from Raman and Infrared spectroscopy pointed out that a high content of intermolecular β-sheet aggregates is formed after long-term incubation. However, near UV experiments, Dynamic Light Scattering, Thioflavin-T fluorescence measurements and Atomic Force Microscopy revealed that the kinetics from native-to-fibrillar state of insulin is hampered only in the presence of (-)-epigallocatechin-3-gallate...
May 1, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29721067/3d-imaging-and-quantitative-analysis-of-vascular-networks-a-comparison-of-ultramicroscopy-and-micro-computed-tomography
#13
Jeremy Epah, Katalin Pálfi, Franziska Luise Dienst, Pedro Felipe Malacarne, Rolf Bremer, Michael Salamon, Sandeep Kumar, Hanjoong Jo, Christoph Schürmann, Ralf Peter Brandes
RATIONALE: Classic histology is the gold standard for vascular network imaging and analysis. The method however is laborious and prone to artefacts. Here, the suitability of ultramicroscopy (UM) and micro-computed tomography (CT) was studied to establish potential alternatives to histology. METHODS: The vasculature of murine organs (kidney, heart and atherosclerotic carotid arteries) was visualized using conventional 2D microscopy, 3D light sheet ultramicroscopy (UM) and micro-CT...
2018: Theranostics
https://www.readbyqxmd.com/read/29709257/improved-pathological-examination-of-tumors-with-3d-light-sheet-microscopy
#14
Per Uhlén, Nobuyuki Tanaka
Light-sheet microscopy offers new possibilities to efficiently visualize large tissue samples in three dimensions. Volumetric 3D imaging can uncover detailed information about the inner landscape of tumors, which can improve cancer diagnosis and therapy. This Forum article highlights the advantages of using light-sheet microscopy for pathological examinations of intact tumor specimens.
May 2018: Trends in Cancer
https://www.readbyqxmd.com/read/29709175/epitaxial-growth-induced-junction-welding-of-silver-nanowire-network-electrodes
#15
Hyungseok Kang, Sol-Ji Song, Young Eun Sul, Byeong-Seon An, Zhenxing Yin, Yongsuk Choi, Lyongsun Pu, Cheol-Woong Yang, Youn Sang Kim, Sung Min Cho, Jung Gu Kim, Jeong Ho Cho
In this study, we developed a roll-to-roll Ag electroplating process for metallic nanowire electrodes using a Galvanostatic mode. Electroplating is a low-cost and facile method for deposition of metal onto a target surface with precise control of both the composition and the thickness. Metallic nanowire networks [silver nanowires (AgNWs) and copper nanowires (CuNWs)] coated onto a polyethylene terephthalate (PET) film were immersed directly in an electroplating bath containing AgNO3. Solvated silver ions (Ag+ ions) were deposited onto the nanowire surface through application of a constant current via an external circuit between the nanowire networks (cathode) and a Ag plate (anode)...
April 30, 2018: ACS Nano
https://www.readbyqxmd.com/read/29706234/bioinspired-supramolecular-engineering-of-self-assembling-immunofibers-for-high-affinity-binding-of-immunoglobulin-g
#16
Yi Li, Lye Lin Lock, Yuzhu Wang, Shih-Hao Ou, David Stern, Arne Schön, Ernesto Freire, Xuankuo Xu, Sanchayita Ghose, Zheng Jian Li, Honggang Cui
Many one-dimensional (1D) nanostructures are constructed by self-assembly of peptides or peptide conjugates containing a short β-sheet sequence as the core building motif essential for the intermolecular hydrogen bonding that promotes directional, anisotropic growth of the resultant assemblies. While this molecular engineering strategy has led to the successful production of a plethora of bioactive filamentous β-sheet assemblies for interfacing with biomolecules and cells, concerns associated with effective presentation of α-helical epitopes and their function preservation have yet to be resolved...
April 16, 2018: Biomaterials
https://www.readbyqxmd.com/read/29684363/immunolabeling-of-cleared-human-pancreata-provides-insights-into-three-dimensional-pancreatic-anatomy-and-pathology
#17
Michaël Noë, Neda Rezaee, Kaushal Asrani, Michael Skaro, Vincent P Groot, Pei-Hsun Wu, Matthew T Olson, Seung-Mo Hong, Sung Joo Kim, Matthew J Weiss, Christopher L Wolfgang, Martin A Makary, Jin He, John L Cameron, Denis Wirtz, Nicholas J Roberts, G Johan A Offerhaus, Lodewijk A A Brosens, Laura D Wood, Ralph H Hruban
Visualizing pathologies in three dimensions (3D) can provide unique insights into the biology of human diseases. A rapid and easy-to-implement dibenzyl ether-based technique was used to clear thick sections of surgically resected human pancreatic parenchyma. Protocols were applicable to both fresh and formalin-fixed paraffin-embedded tissue. The penetration of antibodies into dense pancreatic parenchyma was optimized using both gradually increasing antibody concentrations and centrifugal flow. Immunolabeling with antibodies against CK19 was visualized using both light sheet and confocal laser scanning microscopy...
April 20, 2018: American Journal of Pathology
https://www.readbyqxmd.com/read/29683310/aggregation-induced-emission-active-ruthenium-ii-complex-of-4-7-dichloro-phenanthroline-for-selective-luminescent-detection-and-ribosomal-rna-imaging
#18
Sanjoy Kumar Sheet, Bhaskar Sen, Sumit Kumar Patra, Monosh Rabha, Kripamoy Aguan, Snehadrinarayan Khatua
The development of red emissive aggregation-induced emission (AIE) active probes for organelle-specific imaging is of great importance. Construction of metal complex-based AIE-active materials with metal-to-ligand charge transfer (MLCT), ligand-to-meal charge transfer (LMCT) emission together with the ligand-centered and intraligand (LC/ILCT) emission is a challenging task. We developed a red emissive ruthenium(II) complex, 1[PF6 ]2 , and its perchlorate analogues of the 4,7-dichloro phenanthroline ligand. 1[PF6 ]2 has been characterized by spectroscopic and single-crystal X-ray diffraction...
April 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29681676/tilted-light-sheet-microscopy-with-3d-point-spread-functions-for-single-molecule-super-resolution-imaging-in-mammalian-cells
#19
Anna-Karin Gustavsson, Petar N Petrov, Maurice Y Lee, Yoav Shechtman, W E Moerner
To obtain a complete picture of subcellular nanostructures, cells must be imaged with high resolution in all three dimensions (3D). Here, we present tilted light sheet microscopy with 3D point spread functions (TILT3D), an imaging platform that combines a novel, tilted light sheet illumination strategy with engineered long axial range point spread functions (PSFs) for low-background, 3D super localization of single molecules as well as 3D super-resolution imaging in thick cells. TILT3D is built upon a standard inverted microscope and has minimal custom parts...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29674564/observing-the-cell-in-its-native-state-imaging-subcellular-dynamics-in-multicellular-organisms
#20
Tsung-Li Liu, Srigokul Upadhyayula, Daniel E Milkie, Ved Singh, Kai Wang, Ian A Swinburne, Kishore R Mosaliganti, Zach M Collins, Tom W Hiscock, Jamien Shea, Abraham Q Kohrman, Taylor N Medwig, Daphne Dambournet, Ryan Forster, Brian Cunniff, Yuan Ruan, Hanako Yashiro, Steffen Scholpp, Elliot M Meyerowitz, Dirk Hockemeyer, David G Drubin, Benjamin L Martin, David Q Matus, Minoru Koyama, Sean G Megason, Tom Kirchhausen, Eric Betzig
True physiological imaging of subcellular dynamics requires studying cells within their parent organisms, where all the environmental cues that drive gene expression, and hence the phenotypes that we actually observe, are present. A complete understanding also requires volumetric imaging of the cell and its surroundings at high spatiotemporal resolution, without inducing undue stress on either. We combined lattice light-sheet microscopy with adaptive optics to achieve, across large multicellular volumes, noninvasive aberration-free imaging of subcellular processes, including endocytosis, organelle remodeling during mitosis, and the migration of axons, immune cells, and metastatic cancer cells in vivo...
April 20, 2018: Science
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