scholarly journals Description of the female of Brypoctia punctifer (Hampson, 1898) (Lepidoptera: Cossidae: Zeuzerinae)

2021 ◽  
Vol 45 ◽  
pp. 6-11
Author(s):  
Artem E. Naydenov ◽  
Roman V. Yakovlev ◽  
Jean-Paul Delvalée ◽  
Francis Deknuydt ◽  
Fernando C. Penco
Keyword(s):  
First Time ◽  
Detailed Diagnosis

The article describes for the first time the external characters and genitals of the female Brypoctia punctifer (Hampson, 1898). The description is accompanied by a detailed diagnosis and illustrations.

Mirnapis ohloweni Packer and Dumesh, new species with notes on M. inca Urban (Hymenoptera: Apidae: Eucerini)

Zootaxa ◽  
2012 ◽  
Vol 3478 (1) ◽  
pp. 113-122 ◽  
Author(s):  
LAURENCE PACKER ◽  
SHEILA DUMESH
Keyword(s):  
New Species ◽  
Type Species ◽  
South American ◽  
Northern Chile ◽  
New Material ◽  
First Time ◽  
Detailed Diagnosis

The bee genus Mirnapis is revised. Mirnapis ohloweni Packer and Dumesh new species, is described from East of Nazca, Peru and compared to both sexes of the type species, M. inca Urban, based upon material from northern Chile. Thus, the female of the genus is described for the first time. Both sexes of both species are illustrated and variation in some important characteristics noted. The new material permits a more detailed diagnosis of the genus. Michener’s (2007) key to South American Eucerini is modified to facilitate the identification the genus and Vivallo’s (2009) key to Chilean Eucerini is emended to permit identification of M. inca.

Metabetaeus Borradaile, 1899 revisited, with description of a new marine species from French Polynesia (Crustacea: Decapoda: Alpheidae)

Zootaxa ◽  
2010 ◽  
Vol 2552 (1) ◽  
pp. 37 ◽  
Author(s):  
ARTHUR ANKER
Keyword(s):  
Marine Species ◽  
French Polynesia ◽  
Rapa Nui ◽  
Society Islands ◽  
Christmas Island ◽  
Distribution Ranges ◽  
The Indian Ocean ◽  
First Time ◽  
Detailed Diagnosis ◽  
Alpheid Shrimp

The alpheid shrimp genus Metabetaeus was previously known from two species associated with anchialine pools and caves, M. minutus (Whitelegge, 1897) and M. lohena Banner & Banner, 1960. In the present study, a somewhat unusual, coral reef inhabiting species of Metabetaeus, M. mcphersonae n. sp., is described based on one male and three female specimens collected off Moorea, Society Islands, French Polynesia. A detailed diagnosis of Metabetaeus is provided for the first time, accommodating characters of all three species. Distribution ranges are updated for M. minutus, recorded for the first time from Sulawesi and Christmas Island in the Indian Ocean, and for M. lohena, recorded for the first time from Rapa Nui (Easter Island). A key to the species of Metabetaeus is also provided.

scholarly journals FIRST REPORT OF THE GENUS CARDIOLPIUM (PSEUDOSCORPIONES: OLPIIDAE) FROM CHINA, WITH DESCRIPTION OF A NEW SPECIES

2016 ◽  
Vol 7 ◽  
pp. 298-304 ◽  
Author(s):  
Zhizhong Gao ◽  
Feng Zhang
Keyword(s):  
New Species ◽  
First Report ◽  
The Family ◽  
First Time ◽  
A New Species ◽  
Detailed Diagnosis

A new pseudoscorpion species, Cardiolpium curcici sp. nov., belonging to the family Olpiidae, is described, and the genus Cardiolpium Mahnert, 1986 is reported from China for the first time. The finding of the new species fills up a gap in the distribution of the genus. Detailed diagnosis, description and illustrations of the new pseudoscorpion species are presented.

scholarly journals On the identity of Lepidodexia (Orosarcophaga) ornata (Townsend, 1927) (Diptera: Sarcophagidae) and a new generic synonym

2021 ◽  
Vol 61 ◽  
pp. e20216135
Author(s):  
Cátia Antunes de Mello-Patiu ◽  
Paula Raile Riccardi
Keyword(s):  
Junior Synonym ◽  
Valid Species ◽  
Generic Diagnosis ◽  
Generic Status ◽  
First Time ◽  
Detailed Diagnosis ◽  
Eleven Species

The revision of the sarcophagid species Lepidodexia (Orosarcophaga) ornata (Townsend, 1927) reveals its identity and a generic synonym. The male terminalia of this species was studied in detail for the first time and revealed its congeneric affinities with Oxyvinia Dodge, 1966. Consequently, the generic status of Orosarcophaga Townsend, 1927 was revalidated, including Oxyvinia Dodge, 1966 as its junior synonym, and O. ornata was corroborated as a valid species and name. Moreover, we provide an updated generic diagnosis of Orosarcophaga, a list of the eleven species of the genus with their distribution, and a detailed diagnosis of O. ornata.

Annulate lamellae in the Sertoli cells of guinea pig testis after unilateral torsion of the spermatic cord

1984 ◽  
Vol 42 ◽  
pp. 196-197
Author(s):  
J. Chakraborty ◽  
A. P. Sinha Hikim ◽  
J. S. Jhunjhunwala
Keyword(s):  
Sertoli Cells ◽  
Guinea Pigs ◽  
Spermatic Cord ◽  
Present Report ◽  
Cell Types ◽  
Annulate Lamellae ◽  
Spermatogenic Cells ◽  
Electron Microscopic ◽  
Structural Details ◽  
First Time

Although the presence of annulate lamellae was noted in many cell types, including the rat spermatogenic cells, this structure was never reported in the Sertoli cells of any rodent species. The present report is based on a part of our project on the effect of torsion of the spermatic cord to the contralateral testis. This paper describes for the first time, the fine structural details of the annulate lamellae in the Sertoli cells of damaged testis from guinea pigs.One side of the spermatic cord of each of six Hartly strain adult guinea pigs was surgically twisted (540°) under pentobarbital anesthesia (1). Four months after induction of torsion, animals were sacrificed, testes were excised and processed for the light and electron microscopic investigations. In the damaged testis, the majority of seminiferous tubule contained a layer of Sertoli cells with occasional spermatogonia (Fig. 1). Nuclei of these Sertoli cells were highly pleomorphic and contained small chromatinic clumps adjacent to the inner aspect of the nuclear envelope (Fig. 2).

Electron spectroscopic imaging and diffraction

1991 ◽  
Vol 49 ◽  
pp. 706-707
Author(s):  
M. Rühle ◽  
J. Mayer ◽  
J.C.H. Spence ◽  
J. Bihr ◽  
W. Probst ◽  
...  
Keyword(s):  
Materials Science ◽  
Electron Spectroscopic Imaging ◽  
Magnetic Filter ◽  
Magnetic Imaging ◽  
Illumination System ◽  
Probe Size ◽  
Diffraction Patterns ◽  
Fritz Haber ◽  
Koehler Illumination ◽  
First Time

A new Zeiss TEM with an imaging Omega filter is a fully digitized, side-entry, 120 kV TEM/STEM instrument for materials science. The machine possesses an Omega magnetic imaging energy filter (see Fig. 1) placed between the third and fourth projector lens. Lanio designed the filter and a prototype was built at the Fritz-Haber-Institut in Berlin, Germany. The imaging magnetic filter allows energy-filtered images or diffraction patterns to be recorded without scanning using efficient area detection. The energy dispersion at the exit slit (Fig. 1) results in ∼ 1.5 μm/eV which allows imaging with energy windows of ≤ 10 eV. The smallest probe size of the microscope is 1.6 nm and the Koehler illumination system is used for the first time in a TEM. Serial recording of EELS spectra with a resolution < 1 eV is possible. The digital control allows X,Y,Z coordinates and tilt settings to be stored and later recalled.

A Novel TEM Technique for Characterizing As-Grown CVD Diamond Films

1991 ◽  
Vol 49 ◽  
pp. 956-957 ◽  
Author(s):  
Z.L. Wang ◽  
J. Bentley ◽  
R.E. Clausing ◽  
L. Heatherly ◽  
L.L. Horton
Keyword(s):  
Diamond Films ◽  
Chemical Vapor ◽  
Growth Direction ◽  
Dark Field ◽  
Growth Surface ◽  
Specimen Preparation ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
First Time ◽  
Microstructural Studies

Microstructural studies by transmission electron microscopy (TEM) of diamond films grown by chemical vapor deposition (CVD) usually involve tedious specimen preparation. This process has been avoided with a technique that is described in this paper. For the first time, thick as-grown diamond films have been examined directly in a conventional TEM without thinning. With this technique, the important microstructures near the growth surface have been characterized. An as-grown diamond film was fractured on a plane containing the growth direction. It took about 5 min to prepare a sample. For TEM examination, the film was tilted about 30-45° (see Fig. 1). Microstructures of the diamond grains on the top edge of the growth face can be characterized directly by transmitted electron bright-field (BF) and dark-field (DF) images and diffraction patterns.

A microscopic marker experiment study on high temperature oxidation of Ni-Al alloy

1986 ◽  
Vol 44 ◽  
pp. 514-515
Author(s):  
Shou-kong Fan
Keyword(s):  
Transport Mechanism ◽  
High Temperature Oxidation ◽  
Transverse Section ◽  
Al Alloy ◽  
Metal Interface ◽  
Electron Microscopic ◽  
Temperature Oxidation ◽  
Analytical Electron ◽  
Microscopic Studies ◽  
First Time

Transmission and analytical electron microscopic studies of scale microstructures and microscopic marker experiments have been carried out in order to determine the transport mechanism in the oxidation of Ni-Al alloy. According to the classical theory, the oxidation of nickel takes place by transport of Ni cations across the scale forming new oxide at the scale/gas interface. Any markers deposited on the Ni surface are expected to remain at the scale/metal interface after oxidation. This investigation using TEM transverse section techniques and deposited microscopic markers shows a different result,which indicates that a considerable amount of oxygen was transported inward. This is the first time that such fine-scale markers have been coupled with high resolution characterization instruments such as TEM/STEM to provide detailed information about evolution of oxide scale microstructure.

Direct imaging of charge transfer

1996 ◽  
Vol 54 ◽  
pp. 680-681
Author(s):  
Yimei Zhu ◽  
J. Tafto
Keyword(s):  
Charge Transfer ◽  
Electron Diffraction ◽  
Scattering Amplitude ◽  
High Temperature Superconductors ◽  
Charge Carriers ◽  
Image Charge ◽  
Net Charge ◽  
Long Time ◽  
Electron Holes ◽  
First Time

The electron holes confined to the CuO2-plane are the charge carriers in high-temperature superconductors, and thus, the distribution of charge plays a key role in determining their superconducting properties. While it has been known for a long time that in principle, electron diffraction at low angles is very sensitive to charge transfer, we, for the first time, show that under a proper TEM imaging condition, it is possible to directly image charge in crystals with a large unit cell. We apply this new way of studying charge distribution to the technologically important Bi2Sr2Ca1Cu2O8+δ superconductors.Charged particles interact with the electrostatic potential, and thus, for small scattering angles, the incident particle sees a nuclei that is screened by the electron cloud. Hence, the scattering amplitude mainly is determined by the net charge of the ion. Comparing with the high Z neutral Bi atom, we note that the scattering amplitude of the hole or an electron is larger at small scattering angles. This is in stark contrast to the displacements which contribute negligibly to the electron diffraction pattern at small angles because of the short g-vectors.

Recent developments in low-voltage SEM of polymers

1993 ◽  
Vol 51 ◽  
pp. 866-867
Author(s):  
S.J. Krause ◽  
W.W. Adams
Keyword(s):  
Low Voltage ◽  
Chromatic Aberration ◽  
Thermal Electron ◽  
Analytical Technique ◽  
Recent Developments ◽  
Beam Currents ◽  
New Generation ◽  
First Time ◽  
Voltage Scanning ◽  
Beam Damage

Over the past decade low voltage scanning electron microscopy (LVSEM) of polymers has evolved from an interesting curiosity to a powerful analytical technique. This development has been driven by improved instrumentation and in particular, reliable field emission gun (FEG) SEMs. The usefulness of LVSEM has also grown because of an improved theoretical and experimental understanding of sample-beam interactions and by advances in sample preparation and operating techniques. This paper will review progress in polymer LVSEM and present recent results and developments in the field.In the early 1980s a new generation of SEMs produced beam currents that were sufficient to allow imaging at low voltages from 5keV to 0.5 keV. Thus, for the first time, it became possible to routinely image uncoated polymers at voltages below their negative charging threshold, the "second crossover", E2 (Fig. 1). LVSEM also improved contrast and reduced beam damage in sputter metal coated polymers. Unfortunately, resolution was limited to a few tenths of a micron due to the low brightness and chromatic aberration of thermal electron emission sources.

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