Glugea anomala. [Descriptions of Fungi and Bacteria].

2019 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Freshwater Fish ◽  
Rough Surface ◽  
Geographical Distribution ◽  
Central Portion ◽  
Fish Parasite ◽  
Scanning Electron

Abstract This article describes the morphology, morphometry, and the geographical distribution of the freshwater fish parasite, Glugea anomala. Infections resulted in tumours (also known as xenomas), mainly in the central portion of lateral flank musculature, under the host skin and in the intestines, tumours filled with spores, spores colourless or nearly so. Using a scanning electron microscope, spores of G. anomala species have a highly rugose surface. This distinguishes them from spores of G. plecoglossi which are smooth rugose, and from spores of G. hertwigi which have a rough surface with loose folds and longitudinal wrinkles. This parasite could be found in Canada, USA, Belgium, France, Germany, Poland, Russia, Sweden, and UK.

Glugea hertwigi. [Descriptions of Fungi and Bacteria].

2019 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
Electron Microscope ◽  
North America ◽  
Scanning Electron Microscope ◽  
Freshwater Fish ◽  
Rough Surface ◽  
Geographical Distribution ◽  
Fish Parasite ◽  
Brackish Waters ◽  
The Family ◽  
Scanning Electron

Abstract This article describes the morphology, morphometrics, and geographical distribution of the freshwater fish parasite Glugea hertwigi infecting fish of the family Osmeridae (smelts) in freshwater of north temperate to boreal Europe and North America and nearby seas and brackish waters. Using a scanning electron microscope, spores of this species have a rough surface with loose folds and longitudinal wrinkles. This distinguishes them from spores of G. anomala. This parasite can be found in Canada, USA, Finland, Germany, and Russia.

scholarly journals Contribution to the systematic knowledge of endemic Aubrieta pinardii Boiss. (Brassicaceae) from Turkey

2020 ◽  
Vol 27 (1) ◽  
pp. 27-35
Author(s):  
Emrah Şirin ◽  
Mehmet Cengiz Karaismailoğlu
Keyword(s):  
Electron Microscope ◽  
Chromosome Number ◽  
Scanning Electron Microscope ◽  
Geographical Distribution ◽  
Anatomical Structures ◽  
Seed Surface ◽  
Cytological Data ◽  
Surface Ornamentation ◽  
Systematic Knowledge ◽  
Scanning Electron

The aim of this study was to document the taxonomical, morphological, anatomical, palynological and cytological characters, and geographical distribution of endemic Aubrieta pinardii Boiss. (Brassicaceae) from Turkey. The description of the taxon was revised as a consequence of comprehensive assessments of many specimens. The surface pictures belonging to seed and pollen of the taxon were obtained by Scanning Electron Microscope. The seed surface ornamentation was rugose. The pollen was radially and isopolar and prolate in forms, with polar axes of 19.52 ± 0.29 μm and equatorial axes of 13.04 ± 0.22 μm, with oval outlines in the equatorial axes, and elliptical in the polar axes. They were three–colpate and colpus sizes varied between 12.98 μm and 13.29 μm in length, and between 1.33 and 2.09 μm in width. Also, the anatomical structures of the root, stem and leaf of species were studied. In cytological studies, the chromosome number of species was found as 2n = 16 (x =8). This was the first work including taxonomical, morphological (macro and micro), anatomical and cytological data of endemic Aubrieta pinardii. Bangladesh J.Plant Taxon. 27(1): 27-35, 2020 (June)

STRUCTURE OF CHROMOSOMES VISUALIZED BY SCANNING ELECTRON MICROSCOPY

1971 ◽  
Vol 13 (4) ◽  
pp. 690-696 ◽  
Author(s):  
C. K. Yu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Rough Surface ◽  
Sodium Citrate ◽  
Chinese Hamster ◽  
Citrate Solution ◽  
Metaphase Chromosomes ◽  
Scanning Electron

Isolated metaphase chromosomes of Chinese hamster observed under the scanning electron microscope appear to have a distinct rough surface composed of chromonemata. The chromonema is a fine filament coated with nucleoprotein, which can be easily removed by hypotonic sodium citrate solution. The centromere, a narrowed, tight portion of the chromosome, is also multistranded. No membrane has been seen in metaphase chromosomes.

“Interpretation of Micrographs from a Scanning Electron Microscope”

1969 ◽  
Vol 27 ◽  
pp. 22-23
Author(s):  
E. Eichen ◽  
D. R. Fitchmun ◽  
L. R. Sefton
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Rough Surface ◽  
Great Increase ◽  
Depth Of Field ◽  
Specimen Preparation ◽  
The Past ◽  
The World ◽  
Voltage Contrast ◽  
Scanning Electron

In the past two years, there has been a great increase in interest in the scanning electron microscope as a research tool. Coupled with this has been a large increase in the number of instruments being used throughout the world. The reasons for this popularity stems from the unique abilities of this form of in strumentation which include: (a) a large depth of field which allows one to view a very rough surface; (b) a minimal requirement of specimen preparation; and (c) its ability to make use of voltage contrast in the study of semiconductors.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

The Broad Applications of the Scanning Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 20-21
Author(s):  
C. T. Nightingale ◽  
S. E. Summers ◽  
T. P. Turnbull
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Surface Topography ◽  
Great Depth ◽  
Resolving Power ◽  
Depth Of Field ◽  
Pictorial Representations ◽  
Scanning Electron

The ease of operation of the scanning electron microscope has insured its wide application in medicine and industry. The micrographs are pictorial representations of surface topography obtained directly from the specimen. The need to replicate is eliminated. The great depth of field and the high resolving power provide far more information than light microscopy.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

Resolution of a Transmitted Electron Image Formed by A Scanning Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 386-387
Author(s):  
S. Takashima ◽  
H. Hashimoto ◽  
S. Kimoto
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Specimen Thickness ◽  
Probe Diameter ◽  
Transmission Electron ◽  
Electron Image ◽  
Conventional Transmission Electron Microscope ◽  
Scanning Electron

The resolution of a conventional transmission electron microscope (TEM) deteriorates as the specimen thickness increases, because chromatic aberration of the objective lens is caused by the energy loss of electrons). In the case of a scanning electron microscope (SEM), chromatic aberration does not exist as the restrictive factor for the resolution of the transmitted electron image, for the SEM has no imageforming lens. It is not sure, however, that the equal resolution to the probe diameter can be obtained in the case of a thick specimen. To study the relation between the specimen thickness and the resolution of the trans-mitted electron image obtained by the SEM, the following experiment was carried out.

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