journal
MENU ▼
Read by QxMD icon Read
search

Micron: the International Research and Review Journal for Microscopy

journal
https://www.readbyqxmd.com/read/30015015/a-study-of-interface-reaction-zone-in-a-sic-fibre-ti-17-composite
#1
Yingwei Fan, Xiaorong Zhou
The interface reaction zone (RZ) in a unidirectional continuous carbon-coated SiC fibre reinforced Ti-17 titanium alloy composite is investigated. Micro-computed tomography (CT), scanning and transmission electron microscopy are employed to characterize the fibre/matrix interface. It is revealed that the interface RZ is a 400 nm thick titanium carbide (TiC) layer which is composed of two sublayers, a 60 nm thick fine-grained sublayer and an approximate 340 nm thick coarse-grained sublayer. The RZ is formed through chemical reaction between carbon coating on the SiC fibre surface and Ti, Zr and Sn in the alloy matrix...
July 9, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30015016/multiple-ellipse-fitting-method-to-precisely-measure-the-positions-of-atomic-columns-in-a-transmission-electron-microscope-image
#2
Q Zhang, C H Jin, H T Xu, L Y Zhang, X B Ren, Y Ouyang, X J Wang, X J Yue, F Lin
In this paper, we propose a multiple-ellipse fitting method to accurately determine the atomic column positions in transmission electron microscopy (TEM) images. The column is enclosed by a series of ellipses fitted from contour lines at equidistant intensity levels, and each atomic column is shaped by an averaged elliptical shape to obtain its positions. In particular, the intensity profile of the atomic column can be obtained by an elliptically rotational average based on its shape; therefore, the intensities of the neighbouring atomic column can be subtracted for each atomic column during subsequent position refinement...
July 6, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30007860/a-comparative-study-of-defect-formation-in-gaas-nanocrystals-selectively-grown-on-nanopatterned-and-flat-si-001-substrates
#3
Roksolana Kozak, Ivan Prieto, Yadira Arroyo Rojas Dasilva, Rolf Erni, Hans von Känel, Gian-Luca Bona, Marta D Rossell
Crystal defects present in GaAs nanocrystals ∼15-50 nm in diameter and grown by metal organic vapor phase epitaxy on top of two different nanopatterned Si(001) substrates (nanopillars and nanotips with ∼40-80 nm openings embedded in a SiO2 matrix) and on a planar substrate, have been investigated by means of atomic-resolution aberration-corrected scanning transmission electron microscopy. Conditions of their formation are discussed. The defect analysis of the three GaAs/Si systems reveals a higher defect density in the GaAs crystals grown on nanopillars as compared to those grown on nanotips and the planar substrate, possibly concomitant to the atomic-scale irregularities identified at the patterned Si(001) nanopillars...
July 2, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30007859/determining-eds-and-eels-partial-cross-sections-from-multiple-calibration-standards-to-accurately-quantify-bi-metallic-nanoparticles-using-stem
#4
Aakash Varambhia, Lewys Jones, Andrew London, Dogan Ozkaya, Peter D Nellist, Sergio Lozano-Perez
Spectroscopic signals such as EDS and EELS provide an effective way of characterising multi-element samples such as Pt-Co nanoparticles in STEM. The advantage of spectroscopy over imaging is the ability to decouple composition and mass-thickness effects for thin samples, into the number of various types of atoms in a sample. This is currently not possible for multi element samples using conventional ADF quantification techniques alone. With recent developments in microscope hardware and software, it is now possible to acquire the ADF, EDS and EELS signals simultaneously and at high speed...
June 28, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30007857/histochemistry-immunohistochemistry-and-cytochemistry-of-the-anterior-midgut-region-of-the-stingless-bee-melipona-quadrifasciata-and-honey-bee-apis-mellifera-hymenoptera-apidae
#5
Lenise Silva Carneiro, Stéphanie Asséf Millen Valente Teixeira, Wagner Gonzaga Gonçalves, Kenner Morais Fernandes, José Cola Zanuncio, José Eduardo Serrão
The anterior midgut region of stingless bees is anatomically differentiated with tall and narrow cells, whereas in other social and solitary bees this anatomical gut region is lacking. The objective of the present study was to describe the histochemistry, immunohistochemistry and cytochemistry of the anterior midgut region of the stingless bee Melipona quadrifasciata in comparison with the honey bee Apis mellifera. The anterior midgut region of both species was evaluated for identification of the enzymes β- galactosidase, glucose-6-phosphatase, acid phosphatase, and alkaline phosphatase, the membrane transporter aquaporin, the hormone FMRF-amide, and lysosomes...
June 28, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30007858/a-ray-tracing-method-for-predicting-contrast-in-neutral-atom-beam-imaging
#6
S M Lambrick, M Bergin, A P Jardine, D J Ward
A ray tracing method for predicting contrast in atom beam imaging is presented. Bespoke computational tools have been developed to simulate the classical trajectories of atoms through the key elements of an atom beam microscope, as described using a triangulated surface mesh, using a combination of MATLAB and C code. These tools enable simulated images to be constructed that are directly analogous to the experimental images formed in a real microscope. It is then possible to understand which mechanisms contribute to contrast in images, with only a small number of base assumptions about the physics of the instrument...
June 26, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29957562/nanoscale-mechanics-of-brain-abscess-an-atomic-force-microscopy-study
#7
Eleonora Minelli, Tanya Enny Sassun, Massimiliano Papi, Valentina Palmieri, Francesca Palermo, Giordano Perini, Manila Antonelli, Francesca Gianno, Giuseppe Maulucci, Gabriele Ciasca, Marco De Spirito
Mechanical stimuli are a fundamental player in the pathophysiology of the brain influencing its physiological development and contributing to the onset and progression of many diseases. In some pathological states, the involvement of mechanical and physical stimuli might be extremely subtle; in others, it is more evident and particularly relevant. Among the latter pathologies, one of the most serious life-threatening condition is the brain abscess (BA), a focal infection localized in the brain parenchyma, which causes large brain mechanical deformations, giving rise to a wide range of neurological impairments...
June 20, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29945118/a-geometric-phase-analysis-method-dedicated-to-nanomaterials-orienting-along-high-index-zone-axis
#8
Yan Wang, Jieyi Yu, Xuefeng Zhang
Strain within nanomaterials plays a crucial role in defining their physical and chemical properties. Geometrical phase analysis (GPA) was widely used to investigate deformation within nanomaterials. The traditional GPA method using geometric phases of two lattice fringes provides two-dimensional strain mapping, which is inapplicable to nanomaterials viewed along high-index zone axis. Herein using silicon nanoplate embedded in Si0.5 Ge0.5 matrix as a test object, we illustrate a GPA method using single lattice fringes...
June 20, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29940491/characterization-of-degeneration-phenomena-in-lithium-ion-batteries-by-combined-microscopic-techniques
#9
U Golla-Schindler, D Zeibig, L Prickler, S Behn, T Bernthaler, G Schneider
The application of detector strategies in scanning electron microscopy (SEM) correlated with computer tomography (CT) and light microscopy (LM) delivered unique new insights in degeneration effects of lithium-ion batteries. There we exemplary studied reference, cycled and storage cells. High-resolution SEM permit to visualize a coating on top of the cathode material of the treated cells for the first time, which also connects the conductive additives and battery active material. This confirms the assumption of a solid permeable interface on top of the cathode...
June 20, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29936304/quantitative-evaluation-of-morphological-changes-in-activated-platelets-in-vitro-using-digital-holographic-microscopy
#10
Yutaka Kitamura, Kazushige Isobe, Hideo Kawabata, Tetsuhiro Tsujino, Taisuke Watanabe, Masayuki Nakamura, Toshihisa Toyoda, Hajime Okudera, Kazuhiro Okuda, Koh Nakata, Tomoyuki Kawase
Platelet activation and aggregation have been conventionally evaluated using an aggregometer. However, this method is suitable for short-term but not long-term quantitative evaluation of platelet aggregation, morphological changes, and/or adhesion to specific materials. The recently developed digital holographic microscopy (DHM) has enabled the quantitative evaluation of cell size and morphology without labeling or destruction. Thus, we aim to validate its applicability in quantitatively evaluating changes in cell morphology, especially in the aggregation and spreading of activated platelets, thus modifying typical image analysis procedures to suit aggregated platelets...
June 18, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29929172/a-literature-review-of-in-situ-transmission-electron-microscopy-technique-in-corrosion-studies
#11
REVIEW
Zhengwei Song, Zhi-Hui Xie
One of the biggest challenges in corrosion investigation is foreseeing precisely how and where materials will degenerate in a designated condition owing to scarceness of accurate corrosion mechanisms. Recent fast development of in situ transmission electron microscopy (TEM) technique makes it achievable to better understand the corrosion mechanism and physicochemical processes at the interfaces between samples and gases or electrolytes by dynamical capture the microstructural and chemical changes with high resolution within a realistic or near-realistic environment...
June 18, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29906782/analytical-model-of-secondary-electron-emission-yield-in-electron-beam-irradiated-insulators
#12
N Ghorbel, A Kallel, G Damamme
The study of secondary electron emission (SEE) yield as a function of the kinetic energy of the incident primary electron beam and its evolution with charge accumulation inside insulators is a source of valuable information (even though an indirect one) on charge transport and trapping phenomena. We will show that this evolution is essentially due, in plane geometry conditions (achieved using a defocused electron beam), to the electric field effect (due to the accumulation of trapped charges in the bulk) in the escape zone of secondary electrons and not to modifications of trapping cross sections, which only have side effects...
June 12, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29909351/a-contribution-to-the-characterization-of-the-silicate-water-interface-part-i-implication-of-a-new-polished-sample-hydration-technique
#13
T Sowoidnich, L Gordon, C Naber, F Bellmann, J Neubauer, D Joester
The analysis of the atomic composition of the interface between tricalcium silicate (C3 S), the main compound of Ordinary Portland Cement, and surrounding solution is still a challenging task. At the same time, that knowledge is of profound importance for describing the basic processes during hydration. By means of Scanning Electron Microscopy (SEM) and Atom Probe Tomography (APT) we combine modern techniques in order to shed light on this topic in the present study. The results of these methods are compared with conduction calorimetry as a standard technique to study the hydration kinetics of cement...
June 11, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29908421/ultrastructural-variability-of-mitochondrial-cristae-induced-in-vitro-by-bee-apis-mellifera-venom-and-its-derivatives-melittin-and-phospholipase-a2-in-isolated-rat-adrenocortical-mitochondria
#14
Adrian Florea, Andrei Patrick Varga, Horea Vladi Matei
We tested the ability of bee venom (BV), melittin (Mlt), and phospholipase A2 (PLA) - used in 5 concentrations each (5, 10, 15, 20 and 40 μg/100 μl) - to promote ultrastructural changes and reorganization of cristae in vitro in mitochondria isolated from rat adrenal cortex after a protocol optimized by us. Thus, apart from two control grups (CI and CS), in which the mitochondria were suspended into saline buffer and isolation medium respectively, 15 more groups of mitochondria were constituted, corresponding to the five different doses of the three substance tested (BV5 to M40; M5 to M40 and P5 to P40)...
June 9, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29906781/structural-optimization-and-amorphous-calcium-phosphate-mineralization-in-sensory-setae-of-a-terrestrial-crustacean-isopoda-oniscidea
#15
Miloš Vittori, Vesna Srot, Birgit Bussmann, Felicitas Predel, Peter A van Aken, Jasna Štrus
Terrestrial isopods possess large sensory setae on their walking legs. Increased fracture resistance of these elongated structures is of crucial importance, making the exoskeleton forming the setae an interesting durable material that may inspire biomimetic designs. We studied the cuticle of the sensory setae with analytical electron microscopy in order to gain detailed insights into its structure and composition at the nanometer scale and identify features that increase the fracture resistance of these minute skeletal elements...
June 9, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30008439/withdrawn-basic-properties-of-atp-induced-myosin-head-movement-in-hydrated-myosin-filaments-studied-using-the-gas-environmental-chamber
#16
H Sugi, T Akimoto, S Chaen
No abstract text is available yet for this article.
June 8, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29908422/bioprospection-of-immature-salivary-glands-of-chrysomya-megacephala-fabricius-1794-diptera-calliphoridae
#17
Ronaldo Roberto Tait Caleffe, Stefany Rodrigues de Oliveira, Adriana Aparecida Sinópolis Gigliolli, Maria Claudia Colla Ruvolo-Takasusuki, Helio Conte
Larval therapy (LT) comprises the application of sterile Calliphoridae larvae for wound debridement, disinfection, and healing in humans and animals. Larval digestion plays a key role in LT, where the salivary glands and gut produce and secrete proteolytic and antimicrobial substances. The objective of this work was to bioprospect the salivary glands of Chrysomya megacephala (Fabricius, 1794) larvae, using ultrastructural, morphological, and histological observations, and the total protein electrophoretic profile...
June 8, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29902614/cellular-and-stromal-elements-organization-in-the-liver-of-grass-carp-ctenopharyngodon-idella-cypriniformes-cyprinidae
#18
Doaa M Mokhtar
Fish liver is considered as a key organ that controls various life functions. The cellular and stromal elements of liver of eighteen specimens of adult grass carp were investigated by light- and electron- microscopy and enzyme histochemistry. The liver was formed of two lobes with a long process extended from the right lobe. Serial paraffin section of the liver identified different kinds of vascular- biliary structures as follows: 1) pancreatic-venous-biliary-arteriolar tracts (P-VBAT); 2) venous-biliary-arteriolar tracts, (VBAT); 3) pancreatic-venous-biliary tracts (P-VBT); 4) venous-biliary tracts (VBT); 5) venous-arteriolar tracts (VAT); 6) isolated veins named as venous tracts (VT); 7) isolated bile ducts, named as biliary tracts (BT); 8) biliary-arteriolar tracts (BAT); 9) pancreatic-biliary tracts (P-BT); 10) pancreatic- venous tracts (P-VT)...
June 6, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29902615/basic-properties-of-atp-induced-myosin-head-movement-in-hydrated-myosin-filaments-studied-using-the-gas-environmental-chamber
#19
H Sugi, T Akimoto, S Chaen
Although more than 50 years have passed since the monumental discovery of Huxley and Hanson that muscle contraction results from relative sliding between actin and myosin filaments, coupled with ATP hydrolysis, the mechanism underlying the filament sliding still remains to be a mystery. It is generally believed that the myofilament sliding is caused by cyclic attachment-detachment between myosin heads in myosin filaments and myosin-binding sites in actin filaments. Attempts to prove the myosin head movement using techniques of X-ray diffraction and chemical probes attached to myosin heads have failed to obtain clear results because of the asynchronous nature of myosin head movement...
June 5, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29885818/a-contribution-to-the-characterization-of-the-silicate-water-interface-part-ii-atom-probe-tomography-of-tricalcium-silicate
#20
C Naber, T Sowoidnich, F Bellmann, J Neubauer, K A DeRocher, D Joester
This work explores the possibility to investigate the nanoscale cement-water interface by means of atom-probe tomography (APT). For this purpose, the main compound of Ordinary Portland Cement, tricalcium silicate, and its hydration product calcium-silicate-hydrate have been analyzed by APT. Of special interest was the surface of anhydrous and hydrated tricalcium silicate. The results show, that a nanoscale characterization of tricalcium silicate with APT is possible by carefully controlling the various measurement parameters...
June 2, 2018: Micron: the International Research and Review Journal for Microscopy
journal
journal
31435
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"