The flagellum and tempers of some male tiger beetles (Coleoptera: Carabidae: Cicindelinae)

2016 ◽  
Vol 148 (4) ◽  
pp. 416-425
Author(s):  
Richard Freitag
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Functional Morphology ◽  
North American ◽  
Inverse Relationship ◽  
Tiger Beetle ◽  
Tiger Beetles ◽  
Free Flagellum ◽  
Scanning Electron ◽  
Shape And Size

AbstractThe male flagellum of 32 North American tiger beetle (Cicindela Linnaeus; Coleoptera: Carabidae: Cicindelinae) species was examined with a scanning electron microscope for new, stable characters that might be useful in studies of taxonomy and functional morphology. Two sets of characters were observed, shape and size of the flagellum, and the form and distribution of tempers (micro teeth-like structures on the surface of the flagellum). These characteristics were surprisingly uniform for most species. It is inferred that the inner walls of the female spermatheca duct are gripped by the male flagellum, achieved either by flexing the inserted temper-free long flagellum, or direct insertion by the temper-covered short flagellum. It is proposed that an inverse relationship pattern exists between the elongate temper-free flagellum, and the temper-covered shorter flagellum.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

scholarly journals Spider silk felting—functional morphology of the ovipositor tip of Clistopyga sp. (Ichneumonidae) reveals a novel use of the hymenopteran ovipositor

2016 ◽  
Vol 12 (8) ◽  
pp. 20160350 ◽  
Author(s):  
Niclas R. Fritzén ◽  
Ilari E. Sääksjärvi
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Functional Morphology ◽  
Spider Silk ◽  
Female Wasp ◽  
Primary Function ◽  
Ovipositor Morphology ◽  
Hard Substrates ◽  
Scanning Electron

Apical serrations of the hymenopteran ovipositor have been widely postulated to originally constitute adaptations for cutting through hard substrates. Simplifications of the ovipositor tip have occurred in several ichneumonid wasp genera associated with spiders. Despite such reduction in Clistopyga (Hymenoptera, Ichneumonidae), the ovipositor still possesses some apical serrations. Through the first detailed study, we believe, on the behaviour of an ovipositing Clistopyga species, we show that it can alter its ovipositor for different purposes and that the primary function of the apical serrations is clinging to its spider host as the spider attempts to escape. Intriguingly, we also discover a hitherto undocumented adaptation for the hymenopteran ovipositor. The female wasp seals openings in the silken spider nest by using its ovipositor on the silk in a highly sophisticated way that is comparable to how humans entangle wool by needle felting. By studying the ovipositor morphology through a scanning electron microscope, we elucidate how this works, and we hypothesize that by closing the nest the female wasp protects its developing kin.

Spore surface morphology of pine stem rusts of Canada as observed under a scanning electron microscope

1971 ◽  
Vol 49 (3) ◽  
pp. 371-372 ◽  
Author(s):  
Y. Hiratsuka
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Spore Surface ◽  
Endocronartium Harknessii ◽  
Scanning Electron ◽  
Shape And Size

Two types of surface markings on the aeciospores of five pine stem rusts occurring in Canada were observed under a scanning electron microscope. Spores of four species, Endocronartium harknessii (J. P. Moore) Y. Hiratsuka (= Peridermium harknessii J. P. Moore), Cronartium coleosporioides Arth. (= P. stalactiforme Arth. & Kern), C. comptoniae Arth., and C. ribicola J. C. Fisch., had annulated processes with five to seven layers and each spore had a smooth area. The smooth area was at the same level as the top layer of the processes. Each species could be distinguished by the shape and size of its processes. Spores of Cronartium comandrae Pk. had no smooth areas and had obtuse or cuspidate processes with no annulations. Different ontogenies were apparent for the two types of spore surface markings.

Effect of Different Abrasives on Chemical Mechanical Polishing for Magnesia Alumina Spinel

2020 ◽  
Vol 866 ◽  
pp. 115-124
Author(s):  
Zhan Kui Wang ◽  
Ming Hua Pang ◽  
Jian Xiu Su ◽  
Jian Guo Yao
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Chemical Mechanical Polishing ◽  
Removal Rate ◽  
Mechanical Polishing ◽  
Key Factors ◽  
Particle Size Analyzer ◽  
Scanning Electron ◽  
Shape And Size

In this paper, a series of chemical mechanical polishing (CMP) experiments for magnesia alumina (Mg-Al) spinel were carried out with different abrasives, and the materials removal rate (MRR) and surface quality was evaluated to explore their different effects. The scanning electron microscope (SEM) and laser particle size analyzer were also employed to test the micro-shape and size distribution of abrasives. Then, the mechanism of different effects with different abrasives was analyzed in CMP for Mg-Al spinel. Those experimental results suggest that different subjecting pressure ratios of abrasives to polishing pad with different abrasive are the key factors leading to difference polishing performances in CMP.

Redefinition of Denisiella Folsom & Mills, 1938 (Collembola: Sminthurididae) with description of three new species from Brazil

Zootaxa ◽  
2018 ◽  
Vol 4434 (1) ◽  
pp. 111
Author(s):  
JOSÉ G. PALACIOS-VARGAS ◽  
AILA SOARES FERREIRA ◽  
DOUGLAS ZEPPELINI
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Antennal Segment ◽  
Different Shapes ◽  
Three New Species ◽  
New Diagnosis ◽  
Scanning Electron ◽  
Shape And Size

A new diagnosis of Denisiella is provided, based on the revision of most descriptions, including three new species from Brazil. New Brazilian taxa share the presence of 6 + 6 eyes, 4 + 4 serrate spine-like on tibiotarsi III and the polycarinate setae on tibiotarsi II but differ from each other by the shape and size of the sensilla of the tibiotarsi I. Denisiella rhizophorae sp. nov. has the combination of sensilla on tibiotarsi I of rhagidial type and C2 blunt on antennal segment III. Only D. betschi sp. nov. has barbulate spines on head and D. caatingae sp. nov. is the only which males present nasal organ. They are illustrated with drawings and scanning electron microscope photographs. Three different shapes of sensilla in the tibiotarsi I were observed and were compared with other species. 

Étude au microscope électronique à balayage de la bulbille de Huperzia selago (L.) Bernh. (Lycopodium) : méristème apical, initiation foliaire et phyllotaxie

1982 ◽  
Vol 60 (5) ◽  
pp. 667-673
Author(s):  
Emmeline Vindt-Balguerie
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Shoot Apex ◽  
Apical Meristem ◽  
Cell Number ◽  
Point Of View ◽  
Scanning Electron ◽  
Shape And Size

The shoot apex of the bulbil of Huperzia selago (L.) Bernh. (Lycopodium) has been examined by scanning electron microscope. From an ontogenic point of view, changes in shape and size have been observed in the apical meristem. Successive minimal and maximal areas of this meristem are described during a plastochron. Area and cell number are also quantified with the scanning electron microscope. Only one leaf is initiated at the beginning of each plastochron, and the two contact parastichies observed in the shoot apex of the mature bulbil are two foliar helices.

Flagellar microstructures of male tiger beetles (Coleoptera: Cicindelidae): implications for systematics and functional morphology

2001 ◽  
Vol 133 (5) ◽  
pp. 633-641 ◽  
Author(s):  
R. Freitag ◽  
A. Hartwick ◽  
A. Singh
Keyword(s):  
Functional Morphology ◽  
North American ◽  
Distributional Pattern ◽  
Tiger Beetles ◽  
Spermathecal Duct ◽  
Narrow Neck ◽  
Asian Species ◽  
Scanning Electron

AbstractA comparison of appressed teeth-like structures, coined tempers, on the flagellum of the male internal sac among 10 North American and one Asian species of tiger beetles is consistent with earlier proposed genera of Cicindela Linné, ranked here as subgenera. Based on scanning electron photomicrographs, observations revealed that the flagellum has a single groove along its whole length, with tempers in the groove, and for most species tempers are present only on one side of the ungrooved flagellar surface; tempers point basally (proximally) both on the flagellar surface and within the flagellar groove; and a distributional pattern of the tempers appears to be unique to each subgenus. The species Cicindela punctulata Olivier and Cicindela lepida Dejean have a lumen in place of a flagellar groove, the former with tempers on the ungrooved flagellar surface and the latter without. Tempers on the ungrooved surface of the flagellum are assumed to grip the inner wall of the spermathecal duct while penetrated by the flagellum during insemination or preinsemination clearing. The presence of tempers on one side of the flagellum promotes rapid, smooth insertion and removal of the flagellum from the duct. It is proposed that tempers of the flagellar groove assist the flow of seminal materials to the spermatheca by guiding the narrow neck of the spermatophore into the spermathecal duct while the flagellum is inserted.

Synthesis and Analysis of Carbide-Derived Carbon from TiC by Chlorination

2014 ◽  
Vol 602-603 ◽  
pp. 463-466 ◽  
Author(s):  
Jin Jia ◽  
Yuan Yuan Zhu ◽  
Ya Fei Zhang ◽  
Ruo Yu Chen ◽  
Bao Lin Xing ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbide Derived Carbon ◽  
Scanning Electron ◽  
Shape And Size

Carbide-derived carbons (CDCs) are produced from carbides by removing non-carbon elements in the process of selective etching. In this paper, CDC was prepared from TiC by chlorination at the temperature range of 600~1100°C. In the chlorinating process, carbide-derived carbon with different microstructure was obtained by controlling the reaction temperature. The structures of CDC were revealed with X-ray diffraction and Raman spectroscopy. The morphologies of CDC were analyzed by scanning electron microscope. From X-ray diffraction analysis, the CDC obtained from TiC in this experiment mainly consisted of amorphous carbon. Basing on scanning electron microscopy, carbide-derived carbon from TiC maintained the shape and size of TiC particles. Keywords: Carbide-derived carbons; chlorination; TiC

Spore ornamentation in the Dryopteris spinulosa complex

1972 ◽  
Vol 50 (7) ◽  
pp. 1617-1621 ◽  
Author(s):  
D. M. Britton
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
North American ◽  
Spine Density ◽  
Spine Morphology ◽  
Spore Ornamentation ◽  
Clear Identification ◽  
Scanning Electron

The spores of five taxa of North American Dryopteris were studied with the scanning electron microscope. The taxa considered were two eastern diploids, D. intermedia (Muhl. ex Willd.) A. Gray and the eastern diploid of D. "dilatata”; two tetraploids, D. spinulosa (O. F. Muell.) Watt and D. campyloptera Clarkson; and one western diploid, D. assimilis S. Walker. All the taxa have spores with spines. Spine density and spine morphology are variable both within and between taxa and do not allow a clear identification of taxa using these characters alone. It is considered that all five taxa are closely related as evidenced by the similarities in their perine morphology as compared with species outside the complex.

scholarly journals Electrochemically Developed Micro/Nanostructures in Single Ion Track Filters As a New Pattern

2015 ◽  
Vol 12 (1) ◽  
pp. 50-53
Author(s):  
S Kaur
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electroless Deposition ◽  
Pore Shape ◽  
Pattern Synthesis ◽  
Morphological Studies ◽  
Nano Structures ◽  
Track Membranes ◽  
Scanning Electron ◽  
Shape And Size

The technique of pattern synthesis using potentiostatic electroless deposition is a very weighty process for fabrication of micro/nano structures and is cheap and simple. In this paper, electrochemical/electroless deposition have been used to develop copper micro/nanostructures within the micro/nanochannels of single ion track membranes. Scanning electron microscope was used for morphological studies. These micro/nanostructures have uniform diameters of 5µm and 200nm which is equivalent to the pore shape and size of the pattern used.

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