scholarly journals Mineralogy and petrology of two ordinary chondrites and their correlation with other meteorites

Mineralogia ◽  
2009 ◽  
Vol 40 (1-4) ◽  
pp. 107-116
Author(s):  
Krzysztof Owocki ◽  
Andrzej Pilski
Keyword(s):  
Light Microscopy ◽  
Electron Microprobe ◽  
Weak Shock ◽  
Parent Body ◽  
Shock Metamorphism ◽  
The Other ◽  
Ordinary Chondrites ◽  
Reflected Light ◽  
Place Of Origin

Mineralogy and petrology of two ordinary chondrites and their correlation with other meteoritesTwo ordinary chondrites are compared and classified using transmitted and reflected light microscopy and electron microprobe analyses. Both meteorites were confiscated by the Polish Customs Service at the border with Belarus. The first meteorite (called in this paper Terespol-1) is a L/LL6 chondrite, its classification being supported by the equilibrated compositions of olivine and orthopyroxene and the presence of large recrystallized feldspars (< 150 μm). The specimen examined experienced weak shock metamorphism (S3) and moderate weathering (although metal in the inner part of the meteorite seems to be unaffected by oxidization). The other meteorite (called in this paper Terespol-2) is a LL6 chondrite which experienced weak shock metamorphism (S3) and is unaffected by weathering. The Terespol-2 meteorite shares its classification with the Dhofar 1401 chondrite but the lack of data prevents further correlation. Both meteorites have been correlated with known findings from the Meteoritical Bulletin database and an attempt is made to identify their place of origin (fall event). Results indicate that Terespol-1 is most closely related to the Dhofar 1316 chondrite and we suggest that both meteorites at least came from the same parent body.

MICROSCOPY AND ELECTRON MICROPROBE ANALYSIS OF SOME IRON–MANGANESE PANS FROM NEWFOUNDLAND

1973 ◽  
Vol 53 (4) ◽  
pp. 349-361 ◽  
Author(s):  
R. BREWER ◽  
R. PROTZ ◽  
J. A. McKEAGUE
Keyword(s):  
Electron Microprobe ◽  
Light Microscope ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
The Other ◽  
Reflected Light ◽  
Fe And Mn ◽  
Iron Manganese ◽  
Mn Concentrations

A number of thin iron–manganese pans from soils with peaty surface horizons have been examined with a light microscope and electron microprobe analyzer. The results show that: (1) concentrations of Fe and Mn (as oxides, hydroxides, or both) occur distinctly separated from each other even where closely associated, i.e., every unit analyzed was dominantly either Mn or Fe with little contamination by the other; (2) Mn concentrations always increase in proportion to Fe with increasing depth in the pans; generally Mn concentrations underlie Fe concentrations; (3) at least in these pans, the various kinds of Fe and Mn concentrations can be distinguished optically by using both transmitted and reflected light characteristics.

The central portions of the Cu–Fe–Se phase system at temperatures from 900 to 300 °C

2020 ◽  
Vol 58 (2) ◽  
pp. 203-221
Author(s):  
Emil Makovicky ◽  
Sven Karup-Møller
Keyword(s):  
Solid Solution ◽  
Light Microscopy ◽  
Electron Microprobe ◽  
Phase System ◽  
Temperature Decrease ◽  
Isotropic Solid ◽  
Reflected Light ◽  
Glass Tubes ◽  
Sulfide Melt ◽  
Similarities And Differences

ABSTRACT The central portions of the condensed phase system Cu–Fe–Se were investigated by means of dry syntheses in evacuated silica glass tubes at 900, 750, 600, 500, 450, 350, and 300 °C. Synthesis products were studied by reflected-light microscopy and electron microprobe analyses. The field of sulfide melt is extensive at 900 °C and retreats progressively towards the Cu–Se side at 750 °C; residual selenide melt persists at 600 °C. The selenium analogue of iss was found only at and below 600 °C; eskebornite becomes individualized at and below 500 °C, whereas the selenium analogue of bornite solid solution is present at all investigated temperatures, although with reduced extent on temperature decrease. The three iron selenides (β, γ, δ) display considerable solubility of copper, which for the mackinawite-like β FeSe reaches 14 at.% Cu at 300 °C. FeSe2 displays an immiscibility gap with isotropic solid solution (Cu,Fe)Se2, the composition of which gradually changes towards Cu-rich with decreasing temperature. Similarities and differences with the sulfur-based system are highlighted.

Comparative strengths and weaknesses of peroxidase and colloidal gold in pre- and post-embedding immunolabeling techniques

1987 ◽  
Vol 45 ◽  
pp. 1002-1005
Author(s):  
D. R. Abrahamson ◽  
P. L. St.John ◽  
E. W. Perry
Keyword(s):  
Electron Microscopy ◽  
Horseradish Peroxidase ◽  
Light Microscopy ◽  
Colloidal Gold ◽  
Light Microscope ◽  
Ultrastructural Localization ◽  
The Other ◽  
Quantitative Studies ◽  
Dense Suspension ◽  
Antigen Localization

Antibodies coupled to tracers for electron microscopy have been instrumental in the ultrastructural localization of antigens within cells and tissues. Among the most popular tracers are horseradish peroxidase (HRP), an enzyme that yields an osmiophilic reaction product, and colloidal gold, an electron dense suspension of particles. Some advantages of IgG-HRP conjugates are that they are readily synthesized, relatively small, and the immunolabeling obtained in a given experiment can be evaluated in the light microscope. In contrast, colloidal gold conjugates are available in different size ranges and multiple labeling as well as quantitative studies can therefore be undertaken through particle counting. On the other hand, gold conjugates are generally larger than those of HRP but usually can not be visualized with light microscopy. Concern has been raised, however, that HRP reaction product, which is exquisitely sensitive when generated properly, may in some cases distribute to sites distant from the original binding of the conjugate and therefore result in spurious antigen localization.

Tandem scanning reflected light microscopy: How it works and applications

1986 ◽  
Vol 44 ◽  
pp. 84-87
Author(s):  
Alan Boyde ◽  
Milan Hadravský ◽  
Mojmír Petran ◽  
Timothy F. Watson ◽  
Sheila J. Jones ◽  
...  
Keyword(s):  
Light Microscopy ◽  
Focal Plane ◽  
Central Symmetry ◽  
Single Line ◽  
Scanning Microscope ◽  
Reflected Light ◽  
Illuminating Light ◽  
Illuminating Beam

The principles of tandem scanning reflected light microscopy and the design of recent instruments are fully described elsewhere and here only briefly. The illuminating light is intercepted by a rotating aperture disc which lies in the intermediate focal plane of a standard LM objective. This device provides an array of separate scanning beams which light up corresponding patches in the plane of focus more intensely than out of focus layers. Reflected light from these patches is imaged on to a matching array of apertures on the opposite side of the same aperture disc and which are scanning in the focal plane of the eyepiece. An arrangement of mirrors converts the central symmetry of the disc into congruency, so that the array of apertures which chop the illuminating beam is identical with the array on the observation side. Thus both illumination and “detection” are scanned in tandem, giving rise to the name Tandem Scanning Microscope (TSM). The apertures are arranged on Archimedean spirals: each opposed pair scans a single line in the image.

scholarly journals Exploiting the Binocular Head in Polarized Light Microscopy

1994 ◽  
Vol 2 (4) ◽  
pp. 16-16
Author(s):  
Walter C. McCrone
Keyword(s):  
Light Microscopy ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
The Other ◽  
Monocular Viewing ◽  
Area Of Interest

Having been brought up on monocular microscopes I find the omnipresent binocular systems a luxury. To support this viewpoint I'd like to suggest some benefits you may not have considered.Because I'm used to monocular viewing I sometimes use two different oculars, say 10X and 25X, in order to scan quickly to find an area of interest and then to examine the detail with higher magnification. Occasionally I use both oculars simultaneously and “concentrate” on either image to the exclusion of the other. A better way is to set the interocular distance at the extreme setting most different from your own interocular distance. By moving your head about a centimeter either way you can use either ocular.

Defects of Planarity of Carbon Films Supported on Electron Microscope Grids Revealed by Reflected Light Microscopy

1994 ◽  
Vol 112 (3) ◽  
pp. 252-258 ◽  
Author(s):  
Marc Schmutz ◽  
Jacques Lang ◽  
Sabine Graff ◽  
Alain Brisson
Keyword(s):  
Electron Microscope ◽  
Light Microscopy ◽  
Carbon Films ◽  
Reflected Light

Hyperspectral reflected light microscopy of plasmonic Au/Ag alloy nanoparticles incubated as multiplex chromatic biomarkers with cancer cells

The Analyst ◽  
2014 ◽  
Vol 139 (20) ◽  
pp. 5247-5253 ◽  
Author(s):  
Sergiy Patskovsky ◽  
Eric Bergeron ◽  
David Rioux ◽  
Mikaël Simard ◽  
Michel Meunier
Keyword(s):  
Light Microscopy ◽  
Cancer Cells ◽  
Cancer Cell ◽  
Human Cancer ◽  
Spatial Localization ◽  
Alloy Nanoparticles ◽  
Human Cancer Cell ◽  
Plasmonic Nanoparticle ◽  
Reflected Light ◽  
Spectroscopic Identification

We report a hyperspectral reflected light microscopy system for plasmonic nanoparticle (NP) imaging, and compare with a conventional darkfield method for spatial localization and spectroscopic identification of single Au, Ag and Au/Ag alloy NPs incubated with fixed human cancer cell preparations.

scholarly journals Glomerulonephritis in schistosomiasis with mesangial IgM deposits

1981 ◽  
Vol 76 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Ageu Godoy Magalhães Filho ◽  
Antônio Victoriano Barbosa ◽  
Teresa Cristina Ferreira
Keyword(s):  
Cell Proliferation ◽  
Light Microscopy ◽  
Immunofluorescence Microscopy ◽  
The Other ◽  
Proliferative Glomerulonephritis ◽  
Mesangial Proliferative Glomerulonephritis ◽  
Normal Pattern ◽  
Glomerular Lesions ◽  
Capillary Walls ◽  
Igm Deposits

Twenty one cases of hepatoesplenic schistosomiasis patients without clinical and laboratory evidence of renal disease, were studied by surgical biopsies using light microscopy and immunofluorescence. The cases were classified histologically as: normal pattern (6 cases); minimal changes (6 cases); and mesangial proliferative glomerulonephritis (9 cases). By the immunofluorescence microscopy using anti IgM, IgG, IgA and C3, the predominant finding in all biopsies, except the normal cases, was granular deposits of IgM in the mesangium along with C3. On the other hand, IgG was present in all cases including normal biopsies along the capillary walls. However IgG was also present in the mesangium only in cases with glomerular lesions. This finding may well be similar to that recently described as IgM mesangial nephropathy. According to our cases a mesangial proliferative glomerulonephritis, characterized by segmental cell proliferation and deposition of IgM in the mesangium, is probably the entity found in the early stages of mansonic schistosomiasis.

scholarly journals Certain Mathematical Instruments for Graphically Indicating the Direction of Refracted and Reflected Light Rays

1906 ◽  
Vol 25 (2) ◽  
pp. 806-812
Author(s):  
J.R. Milne
Keyword(s):  
Optical System ◽  
The Other ◽  
Reflected Light ◽  
Light Rays ◽  
Image Position

The refraction equation sin i == μ sin r, though simple in itself, is apt to give rise, in problems connected with refraction, to formulæ too involved for arithmetical computation. In such cases it may be necessary to trace the course through the optical system in question of a certain number of arbitrarily chosen rays, and thence to find the course of the other rays by interpolation. Thelinkage about to be described affords a rapid and accurate means of determining the paths of the rays through any optical system.

scholarly journals VARIATIONS IN THE STRUCTURE OF MITOCHONDRIA

1956 ◽  
Vol 2 (4) ◽  
pp. 305-312 ◽  
Author(s):  
E. W. Dempsey
Keyword(s):  
Electron Microscopy ◽  
Light Microscopy ◽  
Internal Structure ◽  
Outer Wall ◽  
The Other ◽  
Metabolic Processes ◽  
Intracellular Membranes ◽  
Janus Green ◽  
Definition Of ◽  
Shape Complexity

A characteristic internal structure, consisting of a double-layered outer wall enclosing a matrix-filled space through which pass double-layered membranous folds, would appear to comprise as satisfactory a definition of mitochondria for electron microscopy as their intravital affinity for Janus green affords for light microscopy. Relying for identification upon this characteristic internal structure, mitochondria appear to be pleomorphic structures which vary in size, shape, complexity, and density. They are labile also in that their number may increase or decrease under controlled conditions. The possibility therefore exists that these organelles are constantly being formed and destroyed, perhaps by their participation in metabolic processes. The problem of the origin of mitochondria is in an unsatisfactory state. New organelles unquestionably are formed in particular physiological states. The possibility that new bodies are produced by fission of ones already present does not seem adequate. On the other hand, the possible fabrication of new mitochondria out of intracellular membranes, although an attractive hypothesis, has not been adequately substantiated.

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