scholarly journals SEM studies of ore minerals in skarns from Garby Izerskie, Karkonosze-Izera block, south-western Poland

2013 ◽  
Vol 2 (1) ◽  
pp. 61-66
Author(s):  
Maciej Rybicki ◽  
Łukasz Karwowski ◽  
Kamila Banasik
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Native Gold ◽  
Reflected Light ◽  
Sem Study ◽  
Microscopical Method ◽  
Ore Minerals ◽  
Native Silver ◽  
Native Bismuth ◽  
Scanning Electron

Abstract In “Stanisław” quarry, that is located on Garby Izerskie, ore minerals-bearing calcsilicate skarns were found in 2009. The samples were studied using microscopical method of reflected light and scanning electron microscopy (SEM). Based on SEM study, the predominant ore minerals in investigated samples are chalcopyrite, pyrrhotite, bismuth telluride and native bismuth. Moreover, acanthite, native gold and native silver were also identified. Our studies are the first report of above mentioned minerals from the Garby Izerskie area.

Wood identification of charcoal with 3D-reflected light microscopy

IAWA Journal ◽  
2020 ◽  
Vol 41 (4) ◽  
pp. 478-489 ◽  
Author(s):  
Valentina Zemke ◽  
Volker Haag ◽  
Gerald Koch
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Field Emission ◽  
Polarized Light ◽  
Structural Features ◽  
Light Illumination ◽  
Reflected Light ◽  
Carbonized Wood ◽  
Scanning Electron

Abstract The present study focusses on the application of 3D-reflected light microscopy (3D-RLM) for the wood anatomical identification of charcoal specimens produced from domestic and tropical timbers. This special microscopic technique offers a detailed investigation of anatomical features in charcoal directly compared with the quality of field emission scanning electron microscopy (FESEM). The advantages of using the 3D-RLM technology are that fresh fracture planes of charcoal can be directly observed under the microscope without further preparation or surface treatment. Furthermore, the 3D-technique with integrated polarized light illumination creates high-contrast images of uneven and black charcoal surfaces. Important diagnostic structural features such as septate fibres and intercellular canals can be clearly detected and intervessel pits are directly measured. The comparison of the microscopic analyses reveals that 3D-reflected light microscopy (3D-RLM) provides an effective alternative technique to conventional field emission scanning electron microscopy for the identification of carbonized wood.

A comparative SEM study of the eggs of the Sepsidae (Diptera) with a cladistic analysis based on egg, larval and adult characters

1995 ◽  
Vol 26 (4) ◽  
pp. 425-438 ◽  
Author(s):  
Rudolf Meier
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cladistic Analysis ◽  
Central Canal ◽  
Single Filament ◽  
Data Set ◽  
Sem Study ◽  
Egg Morphology ◽  
Existing Data ◽  
Scanning Electron

AbstractThe eggs of 21 species in 12 genera of Sepsidae were studied using scanning electron microscopy. All but the eggs of Ortalischema have respiratory filaments which aid in gas exchange. Judged by positional differences and the lack of a central canal, the two filaments of Orygma are not homologous to the single filament of most remaining sepsids. Hinton's hypothesis that egg filaments are plesiomorphic for the Sepsidae is therefore rejected. Three egg characters are added to an existing data set comprising 58 taxa and 85 larval and adult characters. The egg characters allow the unambiguous placement of Lasionemopoda, for which the larval and adult data set had suggested two different positions on equally parsimonious trees. Based on the position of Lasionemopoda, the evolution of the fore femora of the Sepsidae is briefly discussed. The egg morphology of the Sepsidae is also compared to the morphology of drosophiline eggs which also have egg filaments.

scholarly journals SEM study of planktonic chlorophytes from the aquatic habitat of the Indian Sundarbans and their conservation status

2019 ◽  
Vol 11 (13) ◽  
pp. 14722-14744
Author(s):  
Gour Gopal Satpati ◽  
Ruma Pal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Conservation Status ◽  
Present Communication ◽  
Line Drawings ◽  
Taxonomic Description ◽  
Modern Technique ◽  
Sem Study ◽  
Rare And Endangered ◽  
Scanning Electron

Scanning electron microscopy (SEM) is the most modern technique for plankton research.  The present paper deals with the taxonomy and morphology of some rare and endangered planktonic chlorophytes in relation to scanning electron microscopy.  Water samples from the distinct water body of the Sundarbans have been concentrated and examined by scanning electron microscopy.  A total of 45 species, of which 17 species of Scenedesmaceae, 10 species each of Hydrodictyaceae and Desmidiaceae, five species of Chlorococcaceae, two species of Selenastraceae and only one species of Chlorellaceae were recorded from the study site.  Some species were recorded as new and rare from the study area.  About 18 species including nine extremely rare, seven occasional, six frequent, four sporadic and one abundant was recorded in the present study.  A detailed taxonomic description with line drawings is also included in the present communication.

Egg morphology update based on new chorionic data of Potamanthus luteus  (Linnaeus), Ephemera danica Müller and Oligoneuriella rhenana (Imhoff) (Insecta, Ephemeroptera) obtained by scanning electron microscopy

Zootaxa ◽  
2007 ◽  
Vol 1465 (1) ◽  
pp. 15-29 ◽  
Author(s):  
NICOLÁS UBERO-PASCAL ◽  
M. ANGELS PUIG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Adhesive Layer ◽  
Morphological Data ◽  
Current Trends ◽  
Sem Study ◽  
Egg Morphology ◽  
Ephemera Danica ◽  
Scanning Electron

The chorionic patterns of Ephemeroptera eggs are very diverse and these have often been used for taxonomic and systematic purposes. In a great number of species, including Potamanthus luteus, Ephemera danica and Oligoneuriella rhenana, these egg features have been studied using light microscopy. However, current trends in egg morphology studies use scanning electron microscopy (SEM), so that the eggs of these species need to be re-described in order to establish morphological comparisons. The general chorionic features which have already been described in these three species are confirmed in our SEM study, although a more detailed description of both the architecture and arrangement of these can now be offered. In addition, this study has allowed us to note new morphological data, such as the chorionic reticulation in P. luteus and the complex extrachorion-adhesive layer in E. danica; classification of the lateral attachment structure in P. luteus and O. rhenana has been changed; and the variability of the polar cap observed in P. luteus underlines the care that must to be taken when selecting chorionic structures for taxonomic purposes.

scholarly journals Spinnerets and silk-producing system of Segestria senoculata (Araneae, Araneomorphae, Segestriidae)

2016 ◽  
Vol 48 (3) ◽  
pp. 388 ◽  
Author(s):  
S. Karschová ◽  
J. Hajer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Current Knowledge ◽  
The Other ◽  
Sem Study ◽  
First Time ◽  
Scanning Electron

The spinning apparatus and silk of <em>Segestria senoculata</em> were studied with the use of scanning electron microscopy and light microscopy, which confirmed the presence of four categories of spigots connected with four types of spinning glands (<em>i.e</em>., <em>Glandulae ampullaceae major, Glandulae ampullaceae minor, Glandulae piriformes and Glandulae pseudaciniformes</em>). New data about the morphology of spinnerets and spigots were obtained for both the adults and nymphal stages of both sexes. For the first time the silken threads of retreats, signal threads and attachment discs of the members of <em>Segestria</em> were subjected to a detailed SEM study. The data resulting from studying the spinning apparatus of <em>S. senoculata</em> was compared to current knowledge of the silk producing systems of families belonging to the Dysderoidea superfamily. Silks that are emitted from spigots in the course of retreat construction are not (similarly to the other dysderoids) processed by the spider’s legs during the subsequent process of hardening. Apart from the major ampullate glands/spigots, segestriids also possess developed minor ampullate glands. Minor ampullate threads are used by <em>S. senoculata</em> spiders when making their signal threads.

Growth of Molybdenum Trioxide Nanoribbons on Oriented Ag and Au Nanostructures: A Scanning Electron Microscopy (SEM) Study

2019 ◽  
Vol 25 (6) ◽  
pp. 1449-1456 ◽  
Author(s):  
Paramita Maiti ◽  
Arijit Mitra ◽  
R. R. Juluri ◽  
Ashutosh Rath ◽  
Parlapalli V Satyam
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Molybdenum Trioxide ◽  
High Vacuum ◽  
Composite Films ◽  
Ultra High Vacuum ◽  
Native Oxide ◽  
Native Oxide Layer ◽  
Sem Study ◽  
Scanning Electron

AbstractWe report the growth of molybdenum trioxide (MoO3) nanoribbons (NRs) on epitaxial Ag and oriented Au nanostructures (NSs) using an ultra-high vacuum (UHV)-molecular beam epitaxy (MBE) technique at different substrate temperatures. An approximately 2 nm silver (Ag) film has been deposited at different growth temperatures (using UHV-MBE) on cleaned Si(100), Si(110), and Si(111) substrates. For faceted Au NSs, an approximately 50 nm Au film has been deposited (using high-vacuum thermal evaporation) on a Si(100) substrate with a native oxide layer at the interface and the sample was annealed in low vacuum (≈10−2) and at high temperature (≈975°C). Scanning electron microscopy measurements were performed to determine the morphology of MoO3/Ag and MoO3/Au composite films. From energy dispersive X-ray spectroscopy elemental mapping and line scans it is found that faceted Au NSs are more favorable for the growth of MoO3 NRs than epitaxial Ag microstructures.

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