Scanning Electron Microscopy of Some Vital Structures of Puntius shalynius Yazdani and Talukdar 1975, an Endemic Hill-Stream Fish of North East India

2014 ◽  
Vol 9 (1) ◽  
pp. 22-28 ◽  
Author(s):  
M. Manorama ◽  
S. N. Ramanujam ◽  
S. Dey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Stream Fish ◽  
North East India ◽  
North East ◽  
Scanning Electron

Scanning electron microscopy of the operculum of Garra lamta (Hamilton) (Cyprinidae:Cypriniformes), an Indian hill stream fish

2010 ◽  
Vol 58 (3) ◽  
pp. 182 ◽  
Author(s):  
Swati Mittal ◽  
Usha Kumari ◽  
Pinky Tripathi ◽  
Ajay Kumar Mittal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Epithelial Cells ◽  
Goblet Cells ◽  
Stream Fish ◽  
Male And Female ◽  
Fish Breeding ◽  
Inner Surface ◽  
Garra Lamta ◽  
Scanning Electron

The surface architecture of the epidermis on the outer surface of the operculum (OE) and the epithelium on the inner surface of the operculum (EISO) of Garra lamta was examined by scanning electron microscopy. The surface appeared smooth on the OE and wavy on the EISO. A wavy epithelium is considered to facilitate an increase in its stretchability, during the expansion of the branchial chamber. The OE and the EISO were covered by a mosaic pavement of epithelial cells with characteristic patterns of microridges and microbridges. Interspersed between the epithelial cells were mucous goblet cell pores, which were not significantly different in number in the OE and the EISO. Nevertheless, their surface area in the EISO was significantly higher than in the OE. This could be an adaptation to secrete higher amounts of mucus on the EISO for keeping the branchial chamber lining clean, avoiding clogging, the increased slipperiness reducing friction from water flow and increased efficiency in protecting against microbial attachments. Rounded bulges on the OE and the EISO were associated with mucous goblet cells. The absence of the taste buds in the EISO, in contrast to the OE, suggests that their function in the branchial chamber may not be of much significance in this fish. Breeding tubercles on the OE are believed to facilitate better contact between the male and female during breeding.

Using analytical pyrolysis and scanning electron microscopy to evaluate charcoal formation of four wood taxa from the caatinga of north-east Brazil

2020 ◽  
Vol 151 ◽  
pp. 104909 ◽  
Author(s):  
Diego Tamburini ◽  
Caroline R Cartwright ◽  
Peter Gasson ◽  
Jeannette Jacqueline Łucejko ◽  
Claudia Luizon Dias Leme
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Analytical Pyrolysis ◽  
North East ◽  
Scanning Electron

Vincetoxicum luridum (Asclepiadeae, Asclepiadoideae, Apocynaceae), a new and long misunderstood endemic species from Balochistan, Pakistan

Phytotaxa ◽  
2018 ◽  
Vol 357 (2) ◽  
pp. 117 ◽  
Author(s):  
SAYED A. SHAH ◽  
AMIR SULTAN ◽  
JUN WEN ◽  
SURAT U. NISA ◽  
XU SU ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Endemic Species ◽  
Closely Related Species ◽  
North East ◽  
South West ◽  
A New Species ◽  
Scanning Electron

We here describe a new species, Vincetoxicum luridum, from South West Balochistan. Scanning electron microscopy (SEM) of leaves and seeds, palynology and chorology support the recognition of V. luridum. The lurid appearance, dense pubescence and ovate corona lobes readily distinguish V. luridum from the closely related species V. stocksii which is endemic to North East Balochistan. We illustrate V. luridum, and confirm the significance of corona morphology for classification of Vincetoxicum in Pakistan. Presently, the V. arnottianum complex comprise four species with purple flowers viz., V. arnottianum, V. sakesarense, V. luridum and V. stocksii. In this study we also present the geographic distribution and a taxonomic key to the taxa of V. arnottianum complex.

A new genus and some cryptic species of Arctic and boreal calloporid cheilostome bryozoans

2006 ◽  
Vol 86 (5) ◽  
pp. 1035-1046 ◽  
Author(s):  
Piotr Kuklinski ◽  
Paul D. Taylor
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Type Species ◽  
New Genus ◽  
East Greenland ◽  
North East ◽  
Three New Species ◽  
Cheilostome Bryozoans ◽  
Scanning Electron

Study of type and other material using scanning electron microscopy has permitted the recognition of three new species and one new genus of Arctic and boreal calloporid anascans. Originally described from the Gulf of St Lawrence, Callopora whiteavesi is reassigned to Flustrellaria, a calloporid genus not previously reported extant. Material from north-east Greenland misidentified as C. whiteavesi is described as C. weslawski sp. nov. The new genus Septentriopora is introduced for calloporids lacking pore chambers, with a distolateral pair of small interzooidal avicularia that face proximally or proximolaterally, and a reduced ovicell. The type species of Septentriopora, Tegella nigrans, has frequently been misidentified. Many of the supposed records of this species belong to two other species, described here as Septentriopora karasi sp. nov. and S. denisenkoae sp. nov. The apparent ovicell in S. karasi is particularly unusual, being vestigial and kenozooid-like in morphology.

A Viking Age Gold Hoard from Essu, Estonia

2018 ◽  
pp. 145-168
Author(s):  
Ester Oras ◽  
Ivar Leimus ◽  
Lauri Joosu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ninth Century ◽  
Energy Dispersive ◽  
Peat Bog ◽  
Viking Age ◽  
North East ◽  
Use Wear ◽  
Formed Part ◽  
Scanning Electron

This chapter presents in full the small gold hoard from Essu, north-east Estonia, on the Vikings’ Austrvegr (eastern route). The hoard was found in a peat bog in the nineteenth century, and comprised six gold pendants dating to around the last quarter of the ninth century. This chapter provides a detailed analysis of the six pendants—one Arabic dinar-pendant and five pendants decorated with filigree and granulation—discussing their decoration and cultural parallels. Results from recent Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS) analysis cast new light on the pendants’ production, alloy content, and use-wear. It is suggested that the filigree pendants were manufactured within Scandinavia and originally formed part of an elaborate female necklace, while the dinar-pendant reached Estonia via the Nordic countries. Overall, the hoard illustrates the prominence of gold within the Viking Age display economy. The chapter concludes by discussing the significance of the hoard from a gender perspective, relating it to a wider group of Viking Age ritual deposits of gold female jewellery sets (so-called ‘themed deposits’).

scholarly journals On a hexactinellid sponge aggregation at the Great Meteor seamount (North-east Atlantic)

2015 ◽  
Vol 95 (7) ◽  
pp. 1389-1394 ◽  
Author(s):  
Joana R. Xavier ◽  
Inês Tojeira ◽  
Rob W.M. Van Soest
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Deep Sea ◽  
East Atlantic ◽  
Azores Archipelago ◽  
North East ◽  
Hexactinellid Sponge ◽  
Glass Sponges ◽  
Great Meteor Seamount ◽  
Scanning Electron

Hexactinellids or glass sponges constitute a predominantly deep-sea sponge group typically occurring at bathyal and abyssal depths. Some species form dense populations along the European and African continental slope but the distribution and extent of these populations remains ill known and the driving factors behind their occurrence poorly understood. Here we report an aggregation of the hexactinellid sponge Poliopogon amadou Thomson, 1878 at ~2700 m depth on the Great Meteor seamount, a large seamount located southern of the Azores archipelago. A description of the species, along with scanning electron microscopy of its spicules, is provided.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

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