Nonwovens structure measurement based on NSST multi-focus image fusion
Publication date: Available online 16 May 2019Source: MicronAuthor(s): Yang Chen, Na Deng, Bin-Jie Xin, Wen-Yu Xing, Zheng-Ye ZhangAbstractIn the digital optical microscope, the depth of field cannot clearly display all fibers in the same image, due to the thickness of nonwovens. A new multi-focus image fusion algorithm based on non-subsampled shearlet transform (NSST) is proposed to improve the quality of fused image, which realizes the fusion of a series of images taken from the same perspective and makes all fibers clearly within a single image. The rule of large absolute value is used to fuse the high frequency sub-ban...
Source: Micron - May 17, 2019 Category: Biology Source Type: research
Parameters Affecting the Accuracy of Nanoparticle Shape Measurement in 3D
Publication date: Available online 13 May 2019Source: MicronAuthor(s): Misa Hayashida, Kai Cui, Darren Homeniuk, Rinyaporn Phengchat, Arthur M. Blackburn, Marek MalacAbstractWhile electron tomography can be used to visualize objects at nanoscale, it is difficult to perform reproducible quantitative measurements. Here we measure the shape of nanoparticles (NPs) in three dimensions (3D) using electron tomography. We evaluated the accuracy of maximum Feret diameter (Feretmax), minimum Feret diameter (Feretmin) and volume of NPs measurements from reconstructed 3D images which were obtained from data acquired with varied electr...
Source: Micron - May 14, 2019 Category: Biology Source Type: research
Morphology and distribution of antennal sensilla of Automeris liberia (Lepidoptera: Saturniidae)
Publication date: Available online 10 May 2019Source: MicronAuthor(s): Kelly Barbosa da Silva, Chryslane Barbosa da Silva, Karlos Antônio Lisboa Ribeiro Júnior, Jeniffer McLaine Duarte de Freitas, Johnnatan Duarte de Freitas, Gilson Sanchez Chia, Ricardo Salles Tinôco, João Gomes da Costa, Henrique Fonseca Goulart, Antônio Euzébio Goulart SantanaAbstractThe lepidopteran species Automeris liberia from the Saturniidae family is a polyphagous insect responsible for defoliating plants, such as the oil palm (Elaeis guineensis Jaquim). The antennae of insects play an important role in survival in various environments. Ante...
Source: Micron - May 11, 2019 Category: Biology Source Type: research
Evidence for novel tubular-bundle structures entangled in the fascia of the inner abdominal wall of a rat
Publication date: Available online 8 May 2019Source: MicronAuthor(s): Byung-Cheon LeeAbstractAfter incubation with Janus Green B in the peritoneal cavities of rats, lymph-vessel-like structures (LSs) were noticed under a stereomicroscope to run parallel to each other with rectangular branches on the inner abdominal wall; rarely were these LSs seen to connect with peritoneal LSs. These LSs were identified by using fluorescence microcopy (FM) at a magnification of 1,000X and confocal laser scanning microscopy (CLSM) to be lymph-vessel-like bundle structures (LBSs). Serial cross-sections of these LBSs were microscopically exa...
Source: Micron - May 8, 2019 Category: Biology Source Type: research
Microstructure of long period stacking ordered phase in an as-cast Mg-Ni-Zn-Dy alloy
Publication date: Available online 29 April 2019Source: MicronAuthor(s): Yuanlin Zhuang, Li Ye, Shengbo Gao, Xiaoqing Liu, Dongshan Zhao, Shuangfeng Jia, Jianian Gui, Jianbo WangAbstractAn as-cast Mg-5Ni-4Zn-1Dy (wt.%) alloy was prepared by traditional ingot metallurgy. Transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) were used to study the microstructural characteristics of 14H LPSO phase in the as-cast Mg-5Ni-4Zn-1Dy (wt.%) alloy. Selected-area electron diffraction, convergent-beam electron diffraction, energy dispersive spectrum and high-angle annular dark-field (HAADF) scannin...
Source: Micron - May 1, 2019 Category: Biology Source Type: research
Carbide and nitride phase characterization in a transition metal carbo-nitride using x-ray spectroscopy and atom probe tomography
Publication date: Available online 24 April 2019Source: MicronAuthor(s): F. Vogel, S. Ngai, C.J. Smith, R. Holler, C.R. Weinberger, N. Wanderka, G.B. ThompsonAbstractA multi-phase hafnium carbo-nitride was investigated by various analytical methods. Incomplete homogenization between mixed HfC-HfN starting powders subjected to hot isostatic pressing resulted in both carbon-rich and nitrogen-rich phases. The compositions of these two phases were quantified in detail by wavelength dispersive spectroscopy and atom probe tomography, with the atom probe tips having either a small or a large shank angle geometry. For each of the ...
Source: Micron - April 25, 2019 Category: Biology Source Type: research
Novel Approach to Microscopic Characterization of Cryo Formation in Air Voids of Concrete
Publication date: Available online 24 April 2019Source: MicronAuthor(s): Peiman Azarsa, Rishi GuptaAbstractPortland Cement Concrete (PCC) production is one of the major contributor to atmospheric Carbon Dioxide (CO2) emission. Geopolymer Concrete (GPC) as an alternative construction material has the potential to reduce CO2 emissions while creating durable structures. Freezing and thawing is an exemplary concrete deterioration mechanism that can cause widespread damage in concrete structures. Concrete structures exposed to freeze-thaw cycles delaminate due to expansive stresses induced when liquid converts to ice. There are...
Source: Micron - April 25, 2019 Category: Biology Source Type: research
Feather evolution from knotted barbules to hooked and unhooked barbules and its finite element analysis
Publication date: Available online 18 April 2019Source: MicronAuthor(s): Y.P. Zhao, X.Y. FanAbstractExperiments involving scanning electron microscopy of the microstructure of barbules and optical microscopy of knotted barbules were conducted: the behaviour of knotted barbules, and their evolution to form a branch of hooked barbules and unhooked barbules were analysed. A growth model for a feather plume was proposed. MATLAB™ 2-d contour microstructures of sectioned knotted feathers and three-dimensional structural models of barbules were established, moreover, these were analysed using the finite element method. The resp...
Source: Micron - April 19, 2019 Category: Biology Source Type: research
Editorial Board
Publication date: June 2019Source: Micron, Volume 121Author(s): (Source: Micron)
Source: Micron - April 16, 2019 Category: Biology Source Type: research
Developmental morphology of the turkey pineal organ. Immunocytochemical and ultrastructural studies
Publication date: Available online 14 April 2019Source: MicronAuthor(s): Marcela Petrusewicz-Kosińska, Barbara Przybylska-Gornowicz, Natalia Ziółkowska, Kamila Martyniuk, Bogdan LewczukAbstractOur previous study showed that the turkey pineal organ, in contrast to that of the chicken, is characterized by a follicular structure throughout the entire period of post-hatching life. Despite the preservation of the follicular organization, the histological structure of the pineal follicles in turkeys changes prominently with age. The present research was performed to investigate the cellular composition and organization of the...
Source: Micron - April 16, 2019 Category: Biology Source Type: research
Changes in ultrastructure of gonads and external morphology during aging in the parthenogenetic cladoceran Daphnia pulex
In this study, we recorded the growth, reproduction, and survival indicators of parthenogenetic D. pulex females to analyze the morphological changes that occur during senescence. We observed the growth and development of the parthenogenetic females on the 7th, 14th, 21 st, and 28th days by using scanning electron microscopy and ultrastructure of the gonads on the 7th, 14th and 21 st days with transmission electron microscopy. We found that body length and reproductive capacity in the parthenogenetic individuals first increased and then decreased with aging, and the survival rate decreased gradually. The depression of ...
Source: Micron - April 14, 2019 Category: Biology Source Type: research
Inhibition of autophagy impairs acrosome and mitochondrial crista formation during spermiogenesis in turtle: Ultrastructural evidence
In this study, we observed ultrastructural malformation of acrosome and mitochondrial cristae during the spermiogenesis of Chinese soft-shelled turtle due to the inhibition of autophagy. Autophagy was blocked with 3-MA, and the inhibition of autophagy was confirmed through western blot analysis. The morphological abnormalities of acrosomes and mitochondria were observed under transmission electron microscopy (TEM). In the early spermiogenesis (Golgi and cap phases), damaged macrovesicle was observed, and its proper expansion over the nucleus failed to be form a normal acrosomal cap. As spermiogenesis proceeded, the malform...
Source: Micron - April 2, 2019 Category: Biology Source Type: research
An ImageJ tool for Simplified post-treatment of TEM Phase Contrast Images (SPCI)
Publication date: Available online 28 March 2019Source: MicronAuthor(s): Verguet Amandine, Messaoudi Cédric, Marco Sergio, Donnadieu PatriciaAbstractTools for taking advantage of phase-contrast in transmission electron microscopy are of great interest for both biological and material sciences studies as shown by the recent use of phase plates and the development of holography. Nevertheless, these tools most often require highly qualified experts and access to advanced equipment that can only be considered after preliminary investigations. Here we propose to address this issue by the development of an ImageJ plugin that al...
Source: Micron - March 29, 2019 Category: Biology Source Type: research
Monitoring bioturbation by a small marine polychaete using microcomputed tomography
Publication date: Available online 26 March 2019Source: MicronAuthor(s): Simone Pennafirme, Alessandra S. Machado, Alessandra C. Machado, Ricardo T. Lopes, Inaya C.B. Lima, Mirian A.C. CrapezAbstractBioturbation is one of the principle biological processes involved in transporting particles and solutes within sediments, which contributes to the maintenance of biodiversity. In muddy polluted environments, bioturbation may increase pollutant flux at the water-sediment interface, thereby enhancing contaminant bioavailability. The behavior of organisms dictates bioturbation, and gallery shape influences the magnitude of solute...
Source: Micron - March 28, 2019 Category: Biology Source Type: research
Fluctuations in cell cycle, morphology and metabolism of Anemia phyllitidis gametophytes are the most important hallmarks of GA3-induced antheridiogenesis
Publication date: Available online 25 March 2019Source: MicronAuthor(s): Andrzej KaźmierczakAbstractThe research object concerns partially explained mechanisms of plant hormone participation in male sex determination in plants, among them in A. phyllitidis gametophytes during GA3-induced antheridiogenesis.To provide an explanation of the mechanisms of fluorescence and white-light microscopy, cytophotometric, autoradiographic and spectrophotometic methods were used to study cell cycle, the number of nucleoli, the amount of DiOC6-stained IMN/ER, in which endoplasmic reticulum (ER) constitutes the main part, and its distribu...
Source: Micron - March 27, 2019 Category: Biology Source Type: research
