High resolution images for Australian goblin spiders of the genus Ischnothyreus (Araneae, Oonopidae).(Bulletin of the American Museum of Natural History, no. 389)

2014 ◽  
Author(s):  
Karen L. Edward ◽  
Mark S. Harvey ◽  
Keyword(s):  
High Resolution ◽  
Natural History ◽  
American Museum ◽  
High Resolution Images

High resolution images for Simlops, a new genus of goblin spiders (Araneae, Oonopidae) from northern South America. (Bulletin of the American Museum of Natural History, no. 388)

2014 ◽  
Author(s):  
Alexandre B. Bonaldo ◽  
Gustavo R. S. Ruiz ◽  
Antonio D. Brescovit ◽  
Adalberto J. Santos ◽  
Ricardo Ott ◽  
...  
Keyword(s):  
High Resolution ◽  
Natural History ◽  
South America ◽  
New Genus ◽  
American Museum ◽  
High Resolution Images ◽  
Northern South America

scholarly journals Taxonomy of the ant genus Carebara Westwood (Formicidae, Myrmicinae) in the Malagasy Region

ZooKeys ◽  
2018 ◽  
Vol 767 ◽  
pp. 1-149
Author(s):  
Frank Azorsa ◽  
Brian Fisher
Keyword(s):  
High Resolution ◽  
Open Access ◽  
Natural History ◽  
The Other ◽  
Major Worker ◽  
Distribution Maps ◽  
History Of ◽  
High Resolution Images ◽  
Almost All ◽  
Worker Caste

The genus Carebara is revised for the Malagasy region, and based on the examination of over 10,000 specimens, twenty-three species are recognized. Twenty one of these are described as new (C.bara sp. n., C.berivelo sp. n., C.betsi sp. n., C.creolei sp. n., C.demeter sp. n., C.dota sp. n., C.hainteny sp. n., C.hiragasy sp. n., C.jajoby sp. n., C.kabosy sp. n., C.lova sp. n., C.mahafaly sp. n., C.malagasy sp. n., C.omasi sp. n., C.placida sp. n., C.raberi sp. n., C.salegi sp. n., C.sampi sp. n., C.tana sp. n., C.tanana sp. n., C.vazimba sp. n.), and two are redescribed, C.grandidieri Forel (= C.voeltzkowi Forel n. syn.) and C.nosindambo Forel. A lectotype is designated for C.nosindambo. C.creolei sp. n. is known only from Mauritius and Seychelles, C.grandidieri Forel is distributed in Comoros, Madagascar and Mayotte, and the other twenty-one species are endemic to Madagascar. Most of the Carebara species recorded in this work are endemic to a specific habitat (ecoregion), but some of them (C.bara sp. n., C.grandidieri Forel, C.jajoby sp. n., C.kabosy sp. n., and C.nosindambo Forel) are widespread within Madagascar across all major habitats. The worker caste of Carebara can be differentiated from other genera in the Myrmicinae subfamily by the presence of the following combination of characters: antennae of eight to eleven segments, with a two-segmented club; anterior clypeal margin without central isolated seta (rarely present in some species or specimens), and usually with four distinct setae; mandibles with four to seven teeth (except in one species from Ghana - C.crigensis with three teeth); and palp formula 2,2 or 1,2. We report that almost all Carebara species found in the Malagasy region have intermediates (distinct forms) in the major worker subcaste, with the largest major workers showing remnants of queen flight sclerites and ocelli. The widespread presence of intermediates in the major worker subcaste expands the morphological boundaries of Carebara. We present an overview of the natural history of Carebara in the Malagasy region, an illustrated key for the identification of the known Malagasy species of Carebara, as well as high-resolution images and distribution maps. Unique identifiers are used for all specimens studied, including type material, and the raw data that forms the basis of this study are available on www.antweb.org (open access).

Additions to the taxonomy of Gnamptogenys Roger (Hymenoptera: Formicidae: Ectatomminae) with an updated key to the New World species

Zootaxa ◽  
2020 ◽  
Vol 4747 (3) ◽  
pp. 450-476
Author(s):  
GABRIELA P. CAMACHO ◽  
WESLLY FRANCO ◽  
RODRIGO M. FEITOSA
Keyword(s):  
New Species ◽  
High Resolution ◽  
Natural History ◽  
New World ◽  
Identification Key ◽  
Distribution Data ◽  
World Species ◽  
Neotropical Species ◽  
High Resolution Images ◽  
First Time

This study aimed to raise and address nomenclatural issues surrounding Neotropical species in the genus Gnamptogenys, in addition to describing new species accumulated in myrmecological collections. New and reinstated names recognized here include G. pernambucana (Santschi) sp. rev., stat.n., G. lenis sp. n., G. latistriata sp. n., and G. avus sp. n. The queen and intercaste of G. lavra Lattke and the queen of G. pernambucana are described for the first time. For these five species we provide complete descriptions and diagnoses, comments on taxonomy and natural history, distribution data, and high-resolution images, including the first images of G. lavra. An updated identification key for all the Neotropical species of Gnamptogenys is also provided, including the new and revived species as well as G. aspera Morgan and G. pilosa Lattke, not present in previous keys for the genus. 

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

Remarks on the application of backscattered electron imaging (BEI) to the scanning electron microscopy (SEM) of biological structures

1983 ◽  
Vol 41 ◽  
pp. 484-487
Author(s):  
Etienne de Harven
Keyword(s):  
High Resolution ◽  
Incident Beam ◽  
Spot Size ◽  
Primary Electron ◽  
Critical Point Drying ◽  
Cell Shapes ◽  
High Resolution Images ◽  
Backscattered Electron ◽  
Electron Imaging ◽  
Scanning Electron

Biological ultrastructures have been extensively studied with the scanning electron microscope (SEM) for the past 12 years mainly because this instrument offers accurate and reproducible high resolution images of cell shapes, provided the cells are dried in ways which will spare them the damage which would be caused by air drying. This can be achieved by several techniques among which the critical point drying technique of T. Anderson has been, by far, the most reproducibly successful. Many biologists, however, have been interpreting SEM micrographs in terms of an exclusive secondary electron imaging (SEI) process in which the resolution is primarily limited by the spot size of the primary incident beam. in fact, this is not the case since it appears that high resolution, even on uncoated samples, is probably compromised by the emission of secondary electrons of much more complex origin.When an incident primary electron beam interacts with the surface of most biological samples, a large percentage of the electrons penetrate below the surface of the exposed cells.

Field Emission SEM Equipped With Noise Compensator

1973 ◽  
Vol 31 ◽  
pp. 302-303
Author(s):  
S. Saito ◽  
H. Todokoro ◽  
S. Nomura ◽  
T. Komoda
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Low Contrast ◽  
Probe Current ◽  
High Resolution Images ◽  
Scanning Electron

Field emission scanning electron microscope (FESEM) features extremely high resolution images, and offers many valuable information. But, for a specimen which gives low contrast images, lateral stripes appear in images. These stripes are resulted from signal fluctuations caused by probe current noises. In order to obtain good images without stripes, the fluctuations should be less than 1%, especially for low contrast images. For this purpose, the authors realized a noise compensator, and applied this to the FESEM.Fig. 1 shows an outline of FESEM equipped with a noise compensator. Two apertures are provided gust under the field emission gun.

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