Enhancement of optical resolution in three-dimensional refractive-index tomograms of biological samples by employing micromirror-embedded coverslips

Lab on a Chip ◽  
2018 ◽  
Vol 18 (22) ◽  
pp. 3484-3491 ◽  
Author(s):  
Seungwoo Shin ◽  
Jihye Kim ◽  
Je-Ryung Lee ◽  
Eun-chae Jeon ◽  
Tae-Jin Je ◽  
...  
Keyword(s):  
Refractive Index ◽  
Biological Samples ◽  
Three Dimensional ◽  
Optical Resolution ◽  
Optical Diffraction ◽  
Diffraction Tomography ◽  
Optical Diffraction Tomography

Resolution-enhanced optical diffraction tomography using a micromirror-embedded coverslips.

scholarly journals Three-dimensional refractive index distributions of individual angiosperm pollen grains

2018 ◽  
Author(s):  
Chansuk Park ◽  
SangYun Lee ◽  
Geon Kim ◽  
SeungJun Lee ◽  
Jaehoon Lee ◽  
...  
Keyword(s):  
Refractive Index ◽  
Three Dimensional ◽  
Pollen Grains ◽  
Optical Diffraction ◽  
Diffraction Tomography ◽  
Optical Diffraction Tomography ◽  
Internal Structures ◽  
Quantitative Analyses ◽  
Angiosperm Pollen ◽  
Preparation Techniques

Three-dimensional (3D) refractive index (RI) imaging and quantitative analyses of angiosperm pollen grains are presented. Using optical diffraction tomography, the 3D RI structures of individual angiosperm pollen grains were measured without using labeling or other preparation techniques. Various physical quantities, including volume, surface area, exine volume, and sphericity, were determined from the measured RI tomograms of pollen grains. Exine skeletons, the distinct internal structures of angiosperm pollen grains, were identified and systematically analyzed.

scholarly journals 3D label-free imaging and analysis of Pinus pollen grains using optical diffraction tomography

2017 ◽  
Author(s):  
Geon Kim ◽  
SangYun Lee ◽  
Seungwoo Shin ◽  
YongKeun Park
Keyword(s):  
Refractive Index ◽  
Three Dimensional ◽  
Pollen Grains ◽  
Reproductive Function ◽  
Optical Diffraction ◽  
List Type ◽  
Diffraction Tomography ◽  
Label Free ◽  
Optical Diffraction Tomography ◽  
Index Maps

SummaryThe structure of pollen grains is related to the reproductive function of the plants. Here, three-dimensional (3D) refractive index maps were obtained for individual conifer pollen grains using optical diffraction tomography (ODT).The 3D morphological features of pollen grains from pine trees were investigated using measured refractive index maps, in which distinct substructures were clearly distinguished and analyzed.Morphological and physiochemical parameters of the pollen grains were quantified from the obtained refractive index (RI) maps and used to quantitatively study the interspecific differences of pollen grains from different strains.Our results demonstrate that ODT can assess the structure of pollen grains. This label-free and rapid 3D imaging approach may provide a new platform for understanding the physiology of pollen grains.

scholarly journals Mitotic Chromosomes in Live Cells Characterized Using High-Speed and Label-Free Optical Diffraction Tomography

Cells ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1368 ◽  
Author(s):  
Kim ◽  
Lee ◽  
Fujii ◽  
Lee ◽  
Lee ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Three Dimensional ◽  
Laser Scanning Microscopy ◽  
Optical Diffraction ◽  
Live Cells ◽  
Confocal Laser ◽  
Diffraction Tomography ◽  
Label Free ◽  
Mitotic Chromosomes ◽  
Optical Diffraction Tomography

The cell nucleus is a three-dimensional, dynamic organelle organized into subnuclear compartments such as chromatin and nucleoli. The structure and function of these compartments are maintained by diffusion and interactions between related factors as well as by dynamic and structural changes. Recent studies using fluorescent microscopic techniques suggest that protein factors can access and are freely mobile in heterochromatin and in mitotic chromosomes, despite their densely packed structure. However, the physicochemical properties of the chromosome during cell division are not fully understood. In the present study, characteristic properties such as the refractive index (RI), volume of the mitotic chromosomes, and diffusion coefficient (D) of fluorescent probes inside the chromosome were quantified using an approach combining label-free optical diffraction tomography with complementary confocal laser-scanning microscopy and fluorescence correlation spectroscopy. Variations in these parameters correlated with osmotic conditions, suggesting that changes in RI are consistent with those of the diffusion coefficient for mitotic chromosomes and cytosol. Serial RI tomography images of chromosomes in live cells during mitosis were compared with three-dimensional confocal micrographs to demonstrate that compaction and decompaction of chromosomes induced by osmotic change were characterized by linked changes in chromosome RI, volume, and the mobilities of fluorescent proteins.

scholarly journals Three-dimensional label-free observation of individual bacteria upon antibiotic treatment using optical diffraction tomography

2019 ◽  
Author(s):  
Jeonghun Oh ◽  
Jea Sung Ryu ◽  
Moosung Lee ◽  
Jaehwang Jung ◽  
Seung yun Han ◽  
...  
Keyword(s):  
Imaging Techniques ◽  
Three Dimensional ◽  
Time Lapse ◽  
Optical Diffraction ◽  
Response Analysis ◽  
Diffraction Tomography ◽  
Label Free ◽  
Optical Diffraction Tomography ◽  
Quantitative Manner ◽  
Basic Studies

AbstractMeasuring alterations in bacteria upon antibiotic application is important for basic studies in microbiology, drug discovery, and clinical diagnosis, and disease treatment. However, imaging and 3D time-lapse response analysis of individual bacteria upon antibiotic application remain largely unexplored mainly due to limitations in imaging techniques. Here, we present a method to systematically investigate the alterations in individual bacteria in 3D and quantitatively analyze the effects of antibiotics. Using optical diffraction tomography, in-situ responses of Escherichia coli and Bacillus subtilis to various concentrations of ampicillin were investigated in a label-free and quantitative manner. The presented method reconstructs the dynamic changes in the 3D refractive-index distributions of living bacteria in response to antibiotics at sub-micrometer spatial resolution.

scholarly journals Optical Fiber Refractive Index Profiling by Iterative Optical Diffraction Tomography

2018 ◽  
Vol 36 (24) ◽  
pp. 5754-5763 ◽  
Author(s):  
Shengli Fan ◽  
Seth Smith-Dryden ◽  
Jian Zhao ◽  
Stefan Gausmann ◽  
Axel Schulzgen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Diffraction ◽  
Diffraction Tomography ◽  
Optical Diffraction Tomography
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