scholarly journals Evidence of a dorsal pharynx in the marine polychaete Capitella teleta (Polychaeta: Capitellidae)

Zoosymposia ◽  
2009 ◽  
Vol 2 (1) ◽  
pp. 317-328 ◽  
Author(s):  
MICHAEL J. BOYLE ◽  
ELAINE C. SEAVER
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Buccal Cavity ◽  
Feeding Mode ◽  
Marine Habitats ◽  
Marine Polychaete ◽  
Pharyngeal Gland ◽  
Capitella Teleta ◽  
Selection Of ◽  
Scanning Electron

Observations from compound, confocal, and scanning electron microscopy reveal that the buccal organ in Capitella teleta Blake, Grassle & Eckelbarger, 2009 should be classified as a dorsal pharynx. This buccal organ is an eversible proboscis that has the following characters: (1) dorsal ciliated pad, (2) well-developed pharyngeal retractor muscles, (3) pharyngeal gland-like structures, (4) cuticular fold surrounding the dorsal ciliated pad, and (5) unciliated buccal cavity and anterior ventral epithelium. All of these features are characteristic of dorsal pharyngeal organs present in oligochaetes and one terrestrial polychaete. Our observations in C. teleta confirm the presence of a dorsal pharynx in larvae, juveniles, and adults. C. teleta is a subsurface deposit feeder and a dorsal pharynx may have evolved independently in Capitellidae through selection of feeding mode in benthic marine habitats. Our results represent the first detailed description of a dorsal pharynx in a marine polychaete.

scholarly journals Polyurethanes used in the endoprosthesis of joints

2010 ◽  
Vol 12 (3) ◽  
pp. 10-14 ◽  
Author(s):  
Agata Domańska ◽  
Anna Boczkowska ◽  
Marta Izydorzak ◽  
Zbigniew Jaegermann ◽  
Krzysztof Kurzydłowski
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Abrasive Wear ◽  
Biodegradable Polymer ◽  
Composite Ceramics ◽  
Ceramic Core ◽  
Scanning Calorimetry ◽  
Selection Of ◽  
Scanning Electron

Polyurethanes used in the endoprosthesis of joints The aim of the studies presented in this paper was the selection of the polyurethanes synthesized from different substrates in order to obtain i) ceramic - biodegradable polymer composite and ii) polyurethane resistant to abrasive wear. The polyurethanes were obtained from the crystalline prepolymers extended by water, because it may have a beneficial effect on the toxicity of the material. The properties of PUs were investigated using infrared spectroscopy, thermogravimetry, differential scanning calorimetry and scanning electron microscopy. In all the tested polyurethanes the peak from the reactive -NCO groups was not observed, which indicates that all the substrates are fully reacted. Such polyurethanes are characterized by interesting properties with the perspective use as components of ceramic-polymer joints endoprosthesis. The designed endoprosthesis should fulfill at least three functions: load bearing function (ceramic core), fastening and stabilizing endoprosthesis to the bone (composite ceramics - biodegradable polymer) and tribologic function allowing mating with parts of the prosthesis (polyurethane layer resistant to abrasive wear).

Gyrosigma rostratum sp. nov. (Bacillariophyta) from the low intertidal zone, Xiamen Bay, southern China

Phytotaxa ◽  
2015 ◽  
Vol 203 (3) ◽  
pp. 254 ◽  
Author(s):  
BING LIU ◽  
DAVID M. WILLIAMS ◽  
BANGQIN HUANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Intertidal Zone ◽  
Southern China ◽  
Unique Characteristic ◽  
Diatom Species ◽  
Xiamen Bay ◽  
Marine Habitats ◽  
Scanning Electron

Gyrosigma rostratum, sp. nov., a new diatom species from the low intertidal zone, Xiamen Bay, southern China, was studied with light and scanning electron microscopy. The valves are lanceolate with protracted rostrate apices, symmetrical to both apical and transapical axis, not sigmoid. The raphe is straight, with a raphe angle of approximately two degrees. The external central raphe endings turn in the same direction and are isomorphic. The unique characteristic of the valve is that a conopeum (a lunate flap of silica, approximately 0.8–1.1 µm wide by 4.4–4.8 µm long) covers the terminal axial area and two rows of areolae near each apex. Gyrosigma rostratum is epipsammic and lives in marine habitats.

Mouth and Mode of Feeding of Caligidae (Copepoda), Parasites of Fishes, as Determined by Light and Scanning Electron Microscopy

1974 ◽  
Vol 31 (10) ◽  
pp. 1583-1588 ◽  
Author(s):  
Z. Kabata
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Buccal Cavity ◽  
Peristaltic Wave ◽  
Lepeophtheirus Salmonis ◽  
Mouth Tube ◽  
Masticatory Apparatus ◽  
Intrinsic Musculature ◽  
Scanning Electron

The structure of the caligid mouth tube is examined by light and scanning electron microscopy in examples of Caligus curtus, C. clemensi, and Lepeophtheirus salmonis. Special attention is directed to the intrinsic musculature of the labrum. A new masticatory apparatus is described, consisting of a divided dentiferous bar at the tip of the labium and referred to as a strigil.A new concept of the mode of feeding is presented. The tissues of the fish are scraped off by movements of the strigil and the debris is then picked up by the mandibles which initiate its passage into the buccal cavity. Its transport is assisted by contractions of labral musculature, capable of creating a propelling, peristaltic wave.

Gyrosigma xiamenense sp. nov. (Bacillariophyta) from the middle intertidal zone, Xiamen Bay, southern China

Phytotaxa ◽  
2015 ◽  
Vol 222 (4) ◽  
pp. 259 ◽  
Author(s):  
Bing Liu ◽  
F.A.S. Sterrenburg ◽  
Bangqin Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Intertidal Zone ◽  
Southern China ◽  
Diatom Species ◽  
Xiamen Bay ◽  
Marine Habitats ◽  
Shaped Part ◽  
Secondary Side ◽  
Scanning Electron

Gyrosigma xiamenense sp. nov., a new diatom species from the middle intertidal zone, Xiamen Bay, southern China, was studied by light and scanning electron microscopy. The valves are large and sigmoid, with parallel sides. The raphe sternum has single curvature. Externally, a row of round pores is present on the mantle; isomorphic proximal raphe fissures turn first in opposite directions, then both final parts of the fissures run nearly parallel to the longitudinal striae. Internally, a row of areolae closest to the raphe sternum is capped by small projections on the primary side whilst these are absent on the secondary side; proximal raphe endings are first club-shaped, then the final parts of the two raphe endings form two T-shaped slits being separated from the club-shaped part by a tiny bridge; there is a vermiform bar in the middle of the raphe nodule. G. xiamenense is epipelic and lives in marine habitats.

scholarly journals Synthesis, morpho-structural characterization and electrophoretic deposition of aegirine obtained by the hydrothermal method in the Si-Fe-Na-H2O system

2015 ◽  
Vol 13 (1) ◽  
pp. 51-58
Author(s):  
Marjan Randjelovic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Stainless Steel ◽  
Electrophoretic Deposition ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Hydrothermal Process ◽  
Efficient Procedure ◽  
Selection Of ◽  
Scanning Electron

Aegirine belongs to a group of minerals known as inosilicates. In this study, a fast and efficient procedure is proposed for the synthesis of aegirine nanoparticles by means of the hydrothermal process, starting from a suspension of simple hydroxide/silicate precursors. Structural properties of the obtained mineral were assessed by the XRD technique. It was found that aegirine was the only crystalline phase present. The expected needle-like morphology, characteristic of inosilicates, was confirmed by scanning electron microscopy (SEM). Through an appropriate selection of solvents and dispersants, an electrophoretic deposition and immobilization of aegirine on stainless steel was achieved. Native layers of aegirine displayed a very smooth morphology, while after calcination, a detachment of the layers from the stainless steel substrate and the appearance of cracks in the coating was observed. This phenomenon could be prevented by the use of appropriate additives.

scholarly journals Development of Methodological Approaches for Examination of Particularly Dangerous Infectious Diseases Agents by Means of Atomic Power Microscopy

2012 ◽  
pp. 62-64 ◽  
Author(s):  
D. V. Utkin ◽  
O. S. Kuznetsov ◽  
P. S. Erokhin ◽  
A. N. Spitsyn ◽  
O. A. Volokh ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infectious Diseases ◽  
Methodological Approach ◽  
Conducting Layer ◽  
Methodological Approaches ◽  
Cell Surface Structure ◽  
Intensive Procedures ◽  
Selection Of ◽  
Scanning Electron

The atomic power microscopy (APM) is used to study the cell surface structure of particularly dangerous infectious diseases agents and to carry out the morphometric analysis. APM shows similar results with scanning electron microscopy. However, its application makes it possible to avoid time-consuming and labour-intensive procedures of samples preparing for testing by fixation, dehydration and sputtering of conducting layer. Methodological approach has been elaborated for preparing and analysis of samples of agents of particularly dangerous infectious diseases by means of APM. This approach includes a selection of optimal substrate, mode of disinfection and scanning of samples.

Scanning electron microscope studies on four species of Ulota from AustraliaThis paper is one of a selection of papers published as part of the special Schofield Gedenkschrift.

Botany ◽  
2010 ◽  
Vol 88 (4) ◽  
pp. 435-438 ◽  
Author(s):  
Helen P. Ramsay
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Species Level ◽  
Distinctive Features ◽  
Australian Species ◽  
Selection Of ◽  
Scanning Electron

Ulota species are difficult to separate to species level on leaf characters alone. In this study, scanning electron microscopy of habit and leaves, capsules, peristomes, and spores proved useful in separating four Australian species. Details of capsule and peristome, particularly distinctive features of the endostome, are shown.

scholarly journals Understanding technical cleanliness: importance, assessment, maintenance

2021 ◽  
Author(s):  
Joanna Faber ◽  
Krzysztof Brodzik ◽  
Marta Nycz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Automotive Industry ◽  
Extraction Procedure ◽  
Analytical Techniques ◽  
Actual State ◽  
Precise Information ◽  
Importance Assessment ◽  
Selection Of ◽  
Scanning Electron

Development of the automotive industry, including so-called dowsizing and rightsizing, entails the need to ensure, and hence to verify, the stringent cleanliness levels of an increasing number of car components. The assurance of proper cleanliness level requires knowledge of the entire production process and precise information on the contaminants that will allow to identify their sources. Obtaining reliable cleanliness information requires establishing of many different factors, i. a. selection of proper contamination extraction and collection technique, proper parameters of extraction, validation of extraction procedure, methods of particles analysis. Analytical techniques which are implemented include gravimetric, optical microscopy and advanced techniques like scanning electron microscopy. This work present’s actual state of knowledge regarding technical cleanliness analysis of components. Important aspects of QA&QC in technical cleanliness assessment are also discussed.

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