The ultrastructure of the epidermis of the redia and cercaria of Parorchis acanthus, Nicoll. A study by scanning and transmission electron-microscopy

Parasitology ◽  
1971 ◽  
Vol 62 (3) ◽  
pp. 479-488 ◽  
Author(s):  
Gwendolen Rees
Keyword(s):  
Electron Micrographs ◽  
Technical Assistance ◽  
Ventral Surface ◽  
The Body ◽  
Muscle Fibres ◽  
Scanning Electron Micrographs ◽  
Large Area ◽  
Transmission Electron ◽  
Parorchis Acanthus ◽  
Scanning Electron

Scanning electron-micrographs have shown the covering of microvilli on the surface of the redia of Parorchis acanthus. In the contracted state the elongated microvilli with bulbous extremities seen in the surface grooves may be the result of compression. The surface of the epidermis of the cercaria is smooth on a large area of the ventral surface and lattice-like with microvilli, laterally, anteriorly, dorsally and on the tail. The spines on the body can be withdrawn into sheaths by the contraction of muscle fibres inserted into the basement lamina below each spine.I would like to express my sincere gratitude to Dr I. ap Gwynn of this department for preparing the scanning electron-micrographs and the School of Engineering Science, University of North Wales, Bangor for the use of their stereoscan. I should also like to thank Mr M. C. Bibby for technical assistance and Professor E. G. Gray and Dr W. Sinclair for assistance with the transmission electron-micrographs.

scholarly journals Surface morphology of the fish parasite Chonopeltis victori Avenant- Oldewage, 1991 and aspects of the histomorphology

Koedoe ◽  
1996 ◽  
Vol 39 (1) ◽  
Author(s):  
Wilmien J. Luus-Powell ◽  
Annemarie Avenant-Oldewage
Keyword(s):  
Sexual Dimorphism ◽  
Surface Morphology ◽  
Electron Micrographs ◽  
Dorsal Surface ◽  
Ventral Surface ◽  
Scanning Electron Micrographs ◽  
Fish Parasite ◽  
Large Numbers ◽  
Different Shapes ◽  
Scanning Electron

The ultrastructure and aspects of the histomorphology of Chonopeltis victori, parasitic on Labeo rosae, L. congoro, L. ruddi, L. cylindricus and Barbus marequensis, are described from scanning electron micrographs and transverse sections. Chonopeltis victori is characterised by sharply pointed tips of the abdomen which are directed outward. Sexual dimorphism is particularly evident from the structure of the natatory lobes on the fourth swimming legs and the accessory copulatory structures on the second, third and fourth swimming legs of males. The most striking feature on leg four of the male is the peg. The elevated peg appears tubular, but the sides are not fused. On the inner collar elliptical projections, each with a central, circular pore, are present. On the elongated outer collar small indentions occur peripherally. The dorsal surface of the peg is subterminally covered by elongated scales. The ventral surface of the thorax and swimming legs are covered with different shapes of posteriorly directed scales. Interspersed amongst these scales, as well as on the dorsal surface, eight types of setae are present in large numbers. The possible function of the peg and other structures are described.

scholarly journals Preparation, Characterization, and Application of Magnetic Fe-SBA-15 Mesoporous Silica Molecular Sieves

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Huayu Huang ◽  
Yongsheng Ji ◽  
Zhenfeng Qiao ◽  
Chuande Zhao ◽  
Jianguo He ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Magnetic Materials ◽  
Magnetic Separation ◽  
Electron Micrographs ◽  
Molecular Sieves ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Metal Form ◽  
Scanning Electron

Magnetic Fe-SBA-15 mesoporous silica molecular sieves were prepared, characterized, and used for magnetic separation. Wet impregnation, drying, and calcination steps led to iron inclusion within the mesopores. Iron oxide was reduced to the metal form with hydrogen, and the magnetic Fe-SBA-15 was obtained. Fourier-transform infrared spectroscopy confirmed the preparation process from the oxide to metal forms. The structure of magnetic materials was confirmed by Mössbauer spectra. Powder X-ray diffraction data indicated that the structure of Fe-SBA-15 retained the host SBA-15 structure. Brunauer-Emmett-Teller analysis revealed a decrease in surface area and pore size, indicating Fe-SBA-15 coating on the inner surfaces. Scanning electron micrographs confirmed the decrease in size for modified SBA-15 particles. From scanning electron micrographs, it was found that the size of the modified SBA-15 particles decreased. Transmission electron micrographs also confirmed that modified SBA-15 retained the structure of the parent SBA-15 silica. Fe-SBA-15 exhibited strong magnetic properties, with a magnetization value of 8.8 emu g-1. The iron content in Fe-SBA-15 was determined by atom adsorption spectroscopy. Fe-SBA-15 was successfully used for the magnetic separation of three aromatic compounds in water. Our results suggest wide applicability of Fe-SBA-15 magnetic materials for the rapid and efficient separation of various compounds.

Electron microscopical observations on the effects of sera from two species of Catostomus on the tegument of Hunterella nodulosa (Cestoidea: Caryophyllidea)

1988 ◽  
Vol 66 (5) ◽  
pp. 1191-1196 ◽  
Author(s):  
Min-Min Li ◽  
H. P. Arai
Keyword(s):  
Electron Micrographs ◽  
Body Wall ◽  
The Body ◽  
Transmission Electron Micrographs ◽  
Catostomus Commersoni ◽  
Transmission Electron ◽  
Catostomus Catostomus ◽  
Electron Microscopical ◽  
Scanning Electron

The effects of sera from Catostomus catostomus and Catostomus commersoni on Hunterella nodulosa incubated in different concentrations for different periods of time are presented. Scanning electron and transmission electron micrographs illustrate the process and extent of lysis of the body wall of the tapeworm. Except in minor details, the lytic damage appears similar to that reported for other cestodes.

Locomotion of the cercaria of Parorchis acanthus, Nicoll and the ultrastructure of the tail

Parasitology ◽  
1971 ◽  
Vol 62 (3) ◽  
pp. 489-503 ◽  
Author(s):  
Gwendolen Rees
Keyword(s):  
Electron Micrographs ◽  
Technical Assistance ◽  
Dorsal Surface ◽  
Cyst Formation ◽  
The Body ◽  
Parorchis Acanthus ◽  
Tail Tip ◽  
Longitudinal Muscles ◽  
Vesicular Secretion

The cercaria of Parorchis acanthus swims by a series of spasmodic ventral flexions of the body moving with the dorsal surface of the body foremost. The wave of contraction continues along the tail which therefore moves dorso-ventrally. Creeping movements precede cyst formation. The structure of the tail is admirably suited to swimming movements and to rapid shortening and lengthening. The wall is provided with circular and longitudinal muscles and abundant mitochondria. The centre of the tail contains fluid in which is a network of large myoblasts the processes of which overlap and probably slide over one another during the tail movements. Glands opening into the terminal tail invagination secrete an adhesive substance consisting of mucoprotein and glycoprotein which together with the vesicular secretion around the aperture enables the tail tip to attach itself to the substratum.I would like to express my sincere thanks to Dr I. ap Gwynn of this department for invaluable help in the preparation of the electron-micrographs and Mr R. A. Moore and Mr M. C. Bibby for technical assistance.

A new genus and four new species of millipedes from Tasmania, Australia (Diplopoda: Polydesmida: Dalodesmidae), with notes on male leg setae in some Tasmanian dalodesmids

Zootaxa ◽  
2004 ◽  
Vol 558 (1) ◽  
pp. 1 ◽  
Author(s):  
ROBERT MESIBOV
Keyword(s):  
New Species ◽  
Electron Micrographs ◽  
Type Species ◽  
New Genus ◽  
Scanning Electron Micrographs ◽  
Scanning Electron

Bromodesmus catrionae n. gen., n. sp. (type species), B. militaris n. sp., B. riparius n. sp. and B. rufus n. sp. are described. The new genus is characterized by greatly reduced paranota and a gonopod telopodite expanded at the distal end into a posteriorly concave hood fringed with teeth; the hood partly protects a long, curved, acutely pointed solenomerite. Male leg setation in the type species of six Tasmanian dalodesmid genera is briefly discussed and illustrated with scanning electron micrographs. The sphaerotrichome shaft is sharply pointed in Atrophotergum; gently tapered in Dasystigma, Lissodesmus and Tasmanodesmus; expanded at the tip in Bromodesmus; and entirely absent in Gasterogramma. Tips of the setae forming the dense ventral brush on male podomeres are gently tapered in Dasystigma and Lissodesmus, truncated in Gasterogramma, expanded in Bromodesmus and forked in Tasmanodesmus.

Aphid parasitoids infesting cotton, citrus, tobacco, and cereal crops in southeastern Europe: aphid-plant associations and keys

2005 ◽  
Vol 137 (5) ◽  
pp. 516-531 ◽  
Author(s):  
Nickolas G. Kavallieratos ◽  
Željko Tomanović ◽  
Christos G. Athanassiou ◽  
Petr Starý ◽  
Vladimir Žikić ◽  
...  
Keyword(s):  
Electron Micrographs ◽  
Separate Group ◽  
Cereal Crops ◽  
Scanning Electron Micrographs ◽  
Southeastern Europe ◽  
Line Drawings ◽  
Plant Associations ◽  
New Information ◽  
Aphid Parasitoids ◽  
Scanning Electron

AbstractWe present new information on the parasitoids (Hymenoptera: Braconidae: Aphidiinae) of aphids infesting cotton, tobacco, citrus, and cereal agroecosystems in southeastern Europe. Nineteen species are keyed and illustrated with scanning electron micrographs and line drawings. The aphidiines presented in this work have been identified from 18 aphid taxa. Furthermore, 96 original parasitoid–aphid–plant associations are presented. Cotton, tobacco, and citrus agroecosystems are connected through aphids and their parasitoids, whereas cereal agroecosystems represent a separate group of associations.

Use of electron microscopy to characterize the surfaces of flocculent and nonflocculent yeast cells

1989 ◽  
Vol 35 (12) ◽  
pp. 1081-1086 ◽  
Author(s):  
Byron F. Johnson ◽  
L. C. Sowden ◽  
Teena Walker ◽  
Bong Y. Yoo ◽  
Gode B. Calleja
Keyword(s):  
Electron Microscopy ◽  
Fission Yeast ◽  
Budding Yeast ◽  
The Other ◽  
Yeast Cells ◽  
Scanning Electron Micrographs ◽  
Soft Or ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Scanning Electron

The surfaces of flocculent and nonflocculent yeast cells have been examined by electron microscopy. Nonextractive preparative procedures for scanning electron microscopy allow comparison in which sharp or softened images of surface details (scars, etc.) are the criteria for relative abundance of flocculum material. Asexually flocculent budding-yeast cells cannot be distinguished from nonflocculent budding-yeast cells in scanning electron micrographs because the scar details of both are well resolved, being hard and sharp. On the other hand, flocculent fission-yeast cells are readily distinguished from nonflocculent cells because fission scars are mostly soft or obscured on flocculent cells, but sharp on nonflocculent cells. Sexually and asexually flocculent fission-yeast cells cannot be distinguished from one another as both are heavily clad in "mucilaginous" or "hairy" coverings. Examination of lightly extracted and heavily extracted flocculent fission-yeast cells by transmission electron microscopy provides micrographs consistent with the scanning electron micrographs.Key words: flocculation, budding yeast, fission yeast, scanning, transmission.

Key for identification of the parasitoids (Hymenoptera: Braconidae: Aphidiinae) of aphids infesting alfalfa in Europe

Zootaxa ◽  
2018 ◽  
Vol 4378 (1) ◽  
pp. 98 ◽  
Author(s):  
MUSTAFA E. GHALIOW ◽  
ANDJELJKO PETROVIĆ ◽  
KORANA KOCIĆ ◽  
JELISAVETA ČKRKIĆ ◽  
ANA MITROVSKI BOGDANOVIĆ ◽  
...  
Keyword(s):  
Electron Micrographs ◽  
Scanning Electron Micrographs ◽  
Line Drawings ◽  
The Subject ◽  
Scanning Electron

Although Aphidiinae parasitoids have been used as agents for biocontrol of alfalfa aphids for more than half a century and have been the subject of numerous ecological investigations, there is an evident lack of systematic studies on the parasitoids of aphids infesting alfalfa in Europe. Here we present an original and up-dated key for identification of both native and invasive Aphidiinae parasitoids attacking aphids that feed on alfalfa in Europe. In total, 20 species are keyed and illustrated with scanning electron micrographs and line drawings. 

Photoluminescence, photocatalysis and Judd–Ofelt analysis of Eu3+-activated layered BiOCl phosphors

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4109-4120 ◽  
Author(s):  
Rohit Saraf ◽  
C. Shivakumara ◽  
Sukanti Behera ◽  
H. Nagabhushana ◽  
N. Dhananjaya
Keyword(s):  
Crystal Structure ◽  
Field Emission ◽  
Electron Micrographs ◽  
Dye Degradation ◽  
Scanning Electron Micrographs ◽  
Chromaticity Diagram ◽  
Cie Chromaticity ◽  
Scanning Electron

Crystal structure of tetragonal BiOCl, field emission scanning electron micrographs, CIE chromaticity diagram and percentage of RhB dye degradation of Bi1−xEuxOCl.

The Dynamics for Aqueous Sodium Adsorption and Characterization of Natural Pyrophyllite

2011 ◽  
Vol 117-119 ◽  
pp. 1129-1132
Author(s):  
Bo Liu ◽  
Hai Feng Chen ◽  
Pei Song Tang
Keyword(s):  
Qualitative Analysis ◽  
Internal Structure ◽  
Electron Micrographs ◽  
Scanning Electron Micrographs ◽  
Adsorption Dynamics ◽  
Natural Mineral ◽  
Aqueous Sodium ◽  
Materials Used ◽  
Scanning Electron

In this experiment, pyrophyllite as the main materials used the flame photometer to measure adsorption. Using the qualitative analysis of the samples of XRD with internal structure and found that pyrophyllite used in the experiment as a natural mineral, the presence with other minerals. Meanwhile, scanning electron micrographs (SEM) from the display showed that the effect of pyrophyllite adsorption for cations should be more significant. Therefore, this experiment focused on the time, Na+ concentration, on the pyrophyllite and different pyrophyllite concentrations (adsorbent dosage) effect on the adsorption, in addition to the adsorption dynamics. The results showed that pyrophyllite adsorption sodium in the best time of equilibrium was 20 minutes, the concentration of NaCl was 50 mg/L, pH = 7, temperature was 313 K, the concentration of pyrophyllite was 5 mg/L.

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