Description of immature stages and adult diagnosis of Stilobezzia coquilletti Kieffer 1917 (Diptera: Ceratopogonidae)

Zootaxa ◽  
2008 ◽  
Vol 1958 (1) ◽  
pp. 31-40 ◽  
Author(s):  
MARÍA M. RONDEROS ◽  
CARLA G. CAZORLA ◽  
GUSTAVO R. SPINELLI ◽  
DAIANE SILVEIRA CARRASCO
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Phase Contrast ◽  
Immature Stages ◽  
Sandy Bottom ◽  
Phase Contrast Microscope ◽  
Contrast Microscope ◽  
Shallow Stream ◽  
Scanning Electron

The pupa and larva of Stilobezzia (Stilobezzia) coquilletti Kieffer are described, and a diagnosis of the adult is given. All described stages were photomicrographed and illustrated by using phase-contrast microscope, plus Scanning Electron Microscope in the case of the larva. Immature stages were collected in a shallow stream of sandy bottom nearby Manaus, Brazil. The pupa is compared with S. (S.) fiebrigi Kieffer, and the larva with S. (S.) antennalis Coquillett.

Heterogeneous Structure in Blends of Rubber Polymers

1965 ◽  
Vol 38 (1) ◽  
pp. 62-75 ◽  
Author(s):  
M. H. Walters ◽  
D. N. Keyte
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Physical Properties ◽  
Polymer Blends ◽  
Phase Contrast ◽  
Heterogeneous Structure ◽  
Phase Contrast Microscope ◽  
Mixed Solutions ◽  
Molecular Scale ◽  
Contrast Microscope

Abstract The phase contrast microscope has been used to examine blends of rubber polymers. Mixing on a molecular scale was never observed, the more homogeneous blends consisting of a pair of interlocking “networks” with a mesh diameter of about a micron. Blending was less perfect when the polymers were of widely different viscosities, and in the worst cases consisted of lumps of the stiffer polymer embedded in the softer polymer. Blends prepared by drying mixed solutions were always exceedingly heterogeneous. Physical properties of gum stocks were not greatly affected by the size of this heterogeneity, although there was evidence from electron microscope surface replicas that rupture surfaces tend to follow the interface between the polymers. The distribution of filler, zinc oxide and protein in blends was studied using a variety of techniques. It was found that these materials (and probably many other compounding ingredients) are not always evenly distributed between the polymers, and this may be expected to affect adversely the physical properties.

Mitotic spindles of Drosophila melanogaster: a phase-contrast and scanning electron-microscope study

1977 ◽  
Vol 23 (1) ◽  
pp. 43-55
Author(s):  
A. Milsted ◽  
W.D. Cohen ◽  
N. Lampen
Keyword(s):  
Drosophila Melanogaster ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Phase Contrast ◽  
Mitotic Spindles ◽  
Scanning Electron Microscope Study ◽  
Cytoplasmic Material ◽  
Spindle Structure ◽  
Scanning Electron

Mitotic spindles have been isolated from the blastema stage of Drosophila melanogaster embryos using modified tubulin-polymerizing medium. ‘Clean’ spindles, relatively free of contaminating cytoplasmic material, are obtained. Under phase contrast, mitotic stages appear remarkably similar to those seen in situ, as reported in early literature. This preservation of morphological integrity, coupled with relative structural simplicity due to low chromosome number (2n = 8), makes these spindles ideal subjects for study. Use of the scanning electron microscope provides excellent visulization of their general structural organization, changes in whole spindle structure during the course of mitosis, and higher resolution viewing of surface detail than is permitted with light microscopy.

scholarly journals Description of the last instar larva and new contributions to the knowledge of the pupa of Dasyhelea mediomunda Minaya (Diptera, Culicomorpha, Ceratopogonidae)

2016 ◽  
Vol 88 (3 suppl) ◽  
pp. 1625-1633
Author(s):  
FLORENTINA DÍAZ ◽  
DANIELLE ANJOS-SANTOS ◽  
AMPARO FUNES ◽  
MARÍA M. RONDEROS
Keyword(s):  
Electron Microscope ◽  
Phase Contrast ◽  
Instar Larva ◽  
Fourth Instar ◽  
Fourth Instar Larva ◽  
Patagonian Steppe ◽  
Contrast Microscope ◽  
First Time ◽  
Small Wetland ◽  
Scanning Electron

ABSTRACT The fourth instar larva of Dasyhelea mediomunda Minaya is described for the first time and a complete description of the pupa is provided, through use of phase-contrast microscope and scanning electron microscope. Studied specimens were collected in a pond connected to a small wetland "mallin" on the Patagonian steppe, Chubut province, Argentina.

Redescription of immature stages of central European fireflies, Part 3: Phosphaenus hemipterus (Goeze, 1777) larva, and notes on its life cycle and behaviour, with a key to three central European lampyrid larvae (Coleoptera: Lampyridae)

Zootaxa ◽  
2018 ◽  
Vol 4382 (3) ◽  
pp. 450
Author(s):  
MARTIN NOVÁK
Keyword(s):  
Electron Microscope ◽  
Life Cycle ◽  
Scanning Electron Microscope ◽  
Morphological Features ◽  
Immature Stages ◽  
Sense Organs ◽  
Predatory Behaviour ◽  
Mature Larva ◽  
Central European ◽  
Scanning Electron

The mature larva of the elusive firefly Phosphaenus hemipterus (Goeze, 1777) is thoroughly redescribed and illustrated with detailed images, including scanning electron microscope figures. The external sense organs and their significance is discussed, as well as the predatory behaviour and specific lifestyle of the larva. A key to the central European lampyrid larvae (viz. P. hemipterus, Lamprohiza splendidula (Linnaeus, 1767) and Lampyris noctiluca (Linnaeus, 1758)) is provided as well as a comparative table of their morphological features. 

Redescription of immature stages of central European fireflies, Part 2: Lamprohiza splendidula (Linnaeus, 1767) larva, pupa and notes on its life cycle and behaviour (Coleoptera: Lampyridae)

Zootaxa ◽  
2018 ◽  
Vol 4378 (4) ◽  
pp. 516
Author(s):  
MARTIN NOVÁK
Keyword(s):  
Electron Microscope ◽  
Life Cycle ◽  
Scanning Electron Microscope ◽  
Developmental Changes ◽  
Immature Stages ◽  
Sense Organs ◽  
Mature Larva ◽  
Male And Female ◽  
Central European ◽  
Scanning Electron

The mature larva of the firefly Lamprohiza splendidula (Linnaeus, 1767) is thoroughly redescribed and illustrated with detailed images, including scanning electron microscope figures. External sense organs, structure of tergal plates and their significance are discussed, as well as photic manifestation of the larvae and pupae and prey hunting in larvae. Male and female pupae are briefly described, with notes on their developmental changes and behaviour, and the life cycle outlined. 

Redescription of immature stages of central European fireflies, Part 1: Lampyris noctiluca (Linnaeus, 1758) larva, pupa and notes on its biology (Coleoptera: Lampyridae: Lampyrinae)

Zootaxa ◽  
2017 ◽  
Vol 4247 (4) ◽  
pp. 429 ◽  
Author(s):  
MARTIN NOVÁK
Keyword(s):  
Electron Microscope ◽  
Life Cycle ◽  
Scanning Electron Microscope ◽  
Immature Stages ◽  
Mature Larva ◽  
Male And Female ◽  
Central European ◽  
Light Production ◽  
Microscope Images ◽  
Scanning Electron

The mature larva of Lampyris noctiluca (Linnaeus, 1758) is redescribed and illustrated in detail, including scanning electron microscope images. Male and female pupae are briefly described, including notes on behaviour as well as light production of the immature stages. Observed structures, life cycle and behaviour of larvae and pupae are discussed. 

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.

The Broad Applications of the Scanning Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 20-21
Author(s):  
C. T. Nightingale ◽  
S. E. Summers ◽  
T. P. Turnbull
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Surface Topography ◽  
Great Depth ◽  
Resolving Power ◽  
Depth Of Field ◽  
Pictorial Representations ◽  
Scanning Electron

The ease of operation of the scanning electron microscope has insured its wide application in medicine and industry. The micrographs are pictorial representations of surface topography obtained directly from the specimen. The need to replicate is eliminated. The great depth of field and the high resolving power provide far more information than light microscopy.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

Resolution of a Transmitted Electron Image Formed by A Scanning Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 386-387
Author(s):  
S. Takashima ◽  
H. Hashimoto ◽  
S. Kimoto
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Specimen Thickness ◽  
Probe Diameter ◽  
Transmission Electron ◽  
Electron Image ◽  
Conventional Transmission Electron Microscope ◽  
Scanning Electron

The resolution of a conventional transmission electron microscope (TEM) deteriorates as the specimen thickness increases, because chromatic aberration of the objective lens is caused by the energy loss of electrons). In the case of a scanning electron microscope (SEM), chromatic aberration does not exist as the restrictive factor for the resolution of the transmitted electron image, for the SEM has no imageforming lens. It is not sure, however, that the equal resolution to the probe diameter can be obtained in the case of a thick specimen. To study the relation between the specimen thickness and the resolution of the trans-mitted electron image obtained by the SEM, the following experiment was carried out.

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