Description of the eggs of Psorophora ciliata and Psorophora ferox (Diptera: Culicidae, Aedini) from the east of the Brazilian state of Santa Catarina using scanning electron microscopy

Zootaxa ◽  
2018 ◽  
Vol 4442 (3) ◽  
pp. 485
Author(s):  
LUCAS ROSSITO DE CARVALHO ◽  
ELIANA MEDEIROS OLIVEIRA ◽  
CARLOS BRISOLA MARCONDES
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Regional Variation ◽  
Outer Edge ◽  
Internal Diameter ◽  
External Diameter ◽  
Santa Catarina ◽  
Size And Shape ◽  
Northern Regions ◽  
Scanning Electron

Scanning electron microscopy was used to examine and describe the egg of Psorophora ciliata, which was not previous adequately described, and the egg of Ps. ferox, which exhibited regional variation. Eggs of Ps. ciliata have long tubercles (length 26.7±1.72 µm) in the outer chorion, surrounded by a hexagonal reticulation. The micropyle (external diameter, to the outer edge of the collar, 26.59 µm; internal diameter 20.8 µm) is surrounded by an irregular collar with a thickness of 14.97 ±0.63 µm. Eggs of Ps. ferox exhibit some differences in the size and shape of tubercles compared to those from other more northern regions. 

Analysis of Applicability of the Hollow Carbon Fibres for Self-Repairing Composites

2012 ◽  
Vol 729 ◽  
pp. 246-251 ◽  
Author(s):  
Sándor Kling ◽  
Tibor Czigány
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Tensile Tests ◽  
Single Fibre ◽  
Internal Diameter ◽  
Carbon Fibres ◽  
Hollow Carbon ◽  
Scanning Electron

The geometry and mechanical properties of solid and hollow carbon fibres were investigated by light-and scanning electron microscopy, and by single fibre tensile tests. The hollowness factor of fibres was determined by their external and internal diameter. The tensile strength was determined by single fibre tensile break tests. It was shown that the bigger the diameter of the fibres the lower the mechanical properties is. It was found that the hollow carbon fibres are suitable for preparation of a self-repairing composite with the advantage over other solutions because of their geometrical and mechanical properties.

The Production and Subsequent Selective Laser Melting of AlSi12 Powder

2017 ◽  
Vol 265 ◽  
pp. 434-438 ◽  
Author(s):  
P.A. Lykov ◽  
A.O. Shults ◽  
K.A. Bromer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Selective Laser Melting ◽  
Gas Jet ◽  
Laser Melting ◽  
Size And Shape ◽  
Powder Particles ◽  
Scanning Electron

The paper studies the atomization of Al-based alloy AlSi12 in gas jet. Air was used as a spraying gas. The size and shape of powder particles were studied by using scanning electron microscopy and optical granulomorphometer. The obtained powder was used in selective laser melting.

A new species of Myrceugenia (Myrteae, Myrtaceae) from Distrito Federal, Brazil, with notes on its micromorphology

Phytotaxa ◽  
2014 ◽  
Vol 183 (1) ◽  
pp. 37
Author(s):  
Kadja Milena Gomes-Bezerra ◽  
Jair Eustáquio Faria ◽  
Leslie Landrum ◽  
Lucia Helena Soares-Silva
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Rio Grande ◽  
Gallery Forest ◽  
Rio Grande Do Sul ◽  
Santa Catarina ◽  
Distrito Federal ◽  
A New Species ◽  
Scanning Electron

During field collections for the doctoral thesis of the first author, a population of Myrceugenia was found in a gallery forest along Bananal stream in the Distrito Federal, Brazil. This population was recognized as a new species related to Myrceugenia glaucescens and M. acutata, separated by 800 km or more from previously known populations of those species in Rio de Janeiro, Paraná, Santa Catarina and Rio Grande do Sul states.  Specimens were studied using scanning electron microscopy (SEM) and the leaf architeture was studied in diaphanized leaves.

Physical properties of La0.8Sr0.2MnO3nanotubes and fibers

2013 ◽  
Vol 1507 ◽  
Author(s):  
Daniel Felipe Simião ◽  
Alessandra Zenatti ◽  
Marcia T. Escote
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Physical Properties ◽  
Perovskite Structure ◽  
Physical Characterization ◽  
External Diameter ◽  
Ferromagnetic Transition ◽  
Microstructural Characteristics ◽  
Scanning Electron

ABSTRACTThis work describes the study of synthesis and physical characterization of nanostructured manganite oxides. The La0.8Sr0.2MnO3 (LSM) nanotubes and fibers have been prepared by electrospinning and pore wetting technique. The samples were characterized by Xray diffraction (XRD), scanning electron microscopy (SEM) and magnetization as a function of temperature (M(T)). XRD results of LSM fibers and nanotubes revealed that both samples crystallize in a rhombohedra-distorted perovskite structure. SEM pictures of these samples revealed ultrafine grains assembled in fibers and nanotubes samples. Analysis of these images revealed samples with external diameter ranging from 300 to 1.4 mm, and 7 μm to hundreds of mm in length. The M(T) measurements of samples La0.8Sr0.2MnO3 revealed a paramagnetic/ferromagnetic transition with decreasing temperature. Such transition occurs at temperatures of Tc ≈ 337 K and Tc ≈ 360 K for the nanotubes and fibers, respectively. Furthermore, this variation of the Tc values is also reported in literature for other manganite nanostructures. Such variation can be related to the microstructural characteristics observed for both LSM samples produced in this work. In general, it is believed that both methodologies allowed the production of nanostructures LSM. Also, these results suggest that the dimensionality of the samples seems to interfere in the physical properties of LSM manganite.

Fabrication of Highly Ordered Arrays of TiO2 Nanotubes on Ti Wires

2012 ◽  
Vol 624 ◽  
pp. 63-66
Author(s):  
Ming Ya Li ◽  
Jian Min Wang ◽  
Jing Guo ◽  
Yue Liu Li ◽  
Xiao Qiang Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Xrd Analysis ◽  
Internal Diameter ◽  
Outer Diameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ordered Arrays ◽  
Glycol Solution ◽  
Scanning Electron

Highly Ordered arrays of TiO2 nanotubes on Ti wire were prepared by anodic oxidation with ethylene glycol solution of NH4F electrolyte. The phase compositions of the samples were characterized using X-ray diffraction (XRD) analysis using Cu-Kα radiation. The microstructure was observed using scanning electron microscopy (SEM). Experimental results show that at the anode condition of 95V, 50°C, and then themal treatment at 550°C, the highly ordered anatase TiO2 nanotubes arrays arranged on the surface of Ti wire. The length of the nanotube achieved was about 31μm, the internal diameter and outer diameter of the nanotube was 127nm and 170nm, respectively.

scholarly journals A Concept for Three-Dimensional Particle Metrology Based on Scanning Electron Microscopy and Structure-from-Motion Photogrammetry

2020 ◽  
Vol 125 ◽  
Author(s):  
Vipin N. Tondare
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Structure From Motion ◽  
3D Model ◽  
Three Dimensional ◽  
Sem Images ◽  
Shape Information ◽  
Size And Shape ◽  
Future Work ◽  
Scanning Electron

Scanning electron microscopy (SEM) has been frequently used for size and shape measurements of particles. SEM images offer two-dimensional (2D) information about a particle’s lateral dimensions. Unfortunately, information about the particle’s three-dimensional (3D) size and shape remains unavailable. To resolve this issue, I propose a new concept in SEM: 3D particle metrology obtained by applying structure-from-motion (SfM) algorithms to multiple rotational SEM images of particles deposited onto a cylindrical substrate to generate a 3D model from which size and shape information can be extracted. Particles can have any size that is suitable for SEM imaging. SEM images of the sample can be acquired from 0° to 360° using a rotational-tip SEM substage. Here, I will discuss the concept and, for clarity, illustrate it with aquarium gravel particles that are glued onto a craft roll and imaged optically before generating the 3D model of that handmade craft. Future work will include the experimental SEM realization, as well as further development of the SfM algorithms. In my view, this proposed concept may become an integral part of SEM-based particle metrology.

The ontogeny of the sclerotia of Colletotrichum coccodes

1980 ◽  
Vol 58 (6) ◽  
pp. 631-636 ◽  
Author(s):  
J. C. Tu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Colletotrichum Coccodes ◽  
Intercellular Spaces ◽  
Large Aggregate ◽  
Size And Shape ◽  
Spongy Layer ◽  
Scanning Electron

The ontogeny of the sclerotia of Colletotrichum coccodes was investigated by scanning electron microscopy. The sclerotium originated as an acervulus differentiated from a stroma, a mass of tightly interwoven thick-walled hyphal cells. Initially, hyphae at the surface of the stroma differentiated into conidiophores and conidia which resulted in a typical acervulus. Following sporulation, the stroma beneath the acervulus assumed the form of a sclerotium. This sclerotium expanded laterally by repeating the processes of acervulus development. As a result, a large aggregate composed of several small sclerotia was formed.Structurally, a mature sclerotium, regardless of its size and shape, consisted of three zones: the outermost, sclerotized, brown spongy layer; the middle, plectenchymatous layer; and the innermost, prosenchymatous core (medulla). The majority of cells in the spongy layer were empty. The plectenchyma consisted of living, tightly packed, thick-walled cells with little or no intercellular spaces. The prosenchyma consisted of loosely packed, living hyphal cells.

ASSOCIATION BETWEEN A SUNFLOWER FUNGAL PATHOGEN, PHOMA MACDONALDII, AND A STEM WEEVIL, APION OCCIDENTALE (COLEOPTERA: CURCULIONIDAE)

1984 ◽  
Vol 116 (9) ◽  
pp. 1267-1273 ◽  
Author(s):  
M. D. Gaudet ◽  
J. T. Schulz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fungal Pathogen ◽  
Size And Shape ◽  
Isolation Techniques ◽  
Fungal Hyphae ◽  
Phoma Macdonaldii ◽  
Scanning Electron

AbstractThe presence of the fungus Phoma macdonaldii Boerema on the exocuticle of the adult stem weevil Apion occidentale Fall, was verified using isolation techniques and scanning electron microscopy. Pycnidiospores matching those of P. macdonaldii in size and shape were observed on the antennae, meso- and metathoracic legs of both field-collected and Phoma-incubated adults. Fungal hyphae were observed on the rostrum of both field-collected and laboratory-inoculated adults. Four percent of the weevils carried P. macdonaldii internally.

scholarly journals Synthesis of polyaniline nanotubes through UV light catalytic method

2015 ◽  
Vol 33 (1) ◽  
pp. 193-197
Author(s):  
Sun Chuanyu ◽  
Wang Yu
Keyword(s):  
Electron Microscopy ◽  
Uv Light ◽  
Copper Nitrate ◽  
Internal Diameter ◽  
External Diameter ◽  
Catalytic Method ◽  
X Ray ◽  
Transmission Electron ◽  
Polyaniline Nanotubes ◽  
Scanning Electron

AbstractIn this study, nitrocellulose (NC) fiber blanket prepared by electrostatic spinning method has been used as a template, and copper nitrate (Cu(NO3)2) as an oxidant to synthesise polyaniline nanotubes doped with heteropolyacid (H4SiW12O40, SiW12) using UV light catalytic method. Infrared spectroscopy (IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technologies were applied to characterize the prepared samples of polyaniline nanotubes. The results show that the external diameter of the tube is about 200 nm, and the internal diameter about 170 nm. We also give a reasonable speculation and explanation about the formation mechanism of the nanotubes.

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