Preparation and characterization of an electromagnetic composite polypyrrole/polyethylene short filament geotextile

In this paper, firstly, polypyrrole was prepared by in situ polymerization using pyrrole as the monomer, hexahydrate ferric chloride as the oxidizer and dopant, and polyethylene geotextile as the substrate to prepare a polypyrrole/polyethylene short filament geotextile composite; secondly, the electromagnetic microwave absorption property and shielding property of the polypyrrole/polyethylene short filament geotextile composite were investigated; finally, the chemical structure of the polypyrrole/polyethylene short filament geotextile composite was characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman test methods. The results show that the reflection loss value is up to the minimum value of –17.53 dB in the frequency range of 0–3 GHz and the best absorbing performance is obtained at the frequency of 1.12 GHz. In the frequency range of 0.95–1.25 GHz, the reflection loss value is less than –10 dB, and the electromagnetic wave is effectively absorbed. The shielding effectiveness value is up to the maximum value of 16.07 dB at the frequency of 1.19 GHz, that is, the shielding ability becomes strongest at the frequency of 1.19 GHz; otherwise, the shielding effectiveness is higher than 14 dB in the frequency range of 0.17–3.0 GHz. The FTIR, Raman, XRD, and DSC tests result show that polypyrrole has been successfully loaded on the polyethylene geotextile, improving the crystallinity and thermal stability property of the composite.

Two new combinations in Oreocharis (Gesneriaceae) based on morphological, molecular and cytological evidence

The newly-circumscribed genus Oreocharis is recently enlarged by incorporating ten other genera with high floral diversity. In this study, our morphological, molecular and cytological evidence supports our adding two species from other two different genera (Boeica and Beccarinda) to Oreocharis. The special corolla shape (campanulate or flat-faced) and related short filament of these two new combinations, Oreocharis guileana and O. baolianis, further enrich the diversity of floral characters of the enlarged Oreocharis. Meanwhile, some supplementary and amended descriptions of these two species are made here. Our morphological, molecular and geographical data indicate that O. guileana is related to O. pilosopetiolata to a certain extent. For O. baolianis, however, our current dataset does not allow conclusions on the species relationship within Oreocharis.

SYSTEMATICAL COMPARATIVE FOR TWO SPECIES AMARANTHUS albus L. AND AMARANTHUS gracilis DEFS. (AMARANTHACEAE) IN IRAQ

This study dealt with comparative taxonomic study for the two species Amarantus albus L. and Amaranthus gracilis Defs. in Iraq . It was included the important morphological characters for roots, stems, leaves ,petioles ,inflorescences and its parts ,floral parts ,fruits and seeds . Also the dimensions and properties of each part have been recorded ,even its colors which helps in isolated and diagnosed the two species, the first one recognized by its white stems while the other one had red stems, also the first species characterized by axillaries sessile inflorescences with so small florets while the other one had terminal clusters spike inflorescence . Stamens were three in first species with short filament while they were 2-3 stamens with long filament in the other one. Also the study determined the rat of the flowering period for the two species as well as the study of ecological and geographical distribution for the two species in Iraq, the results documented with pictures. It could be depended to studied traits of the plant species for classification.

Echiniscidae (Tardigrada, Heterotardigrada) from Faial and Pico Islands, the Azores, with the description of two new species

Nine species of Echiniscidae (Heterotardigrada) are recorded for Faial and Pico Islands. Two of them, Echiniscus azoricus and Bryodelphax atlantis are new to science. Echiniscus merokensis Richters, 1904, Echiniscus perviridis Ramazzotti, 1959 and Echiniscus scabrospinosus Fontoura, 1982 are recorded in the Azores for the first time. Echiniscus azoricus n. sp. has dorsal plates sculptured with dark knobs surrounded by a ring of small pores. Lateral and dorsal appendages are spines B, C, D, E, C d and D d . Bryodelphax atlantis n. sp. has no ventral plates; it has small lateral supplementary plates between the paired plates, short filament A and a dentate collar on the hind legs with short and wide triangular teeth. A dichotomous key to the species of the genus Bryodelphax is also given.

A new species of Trichomycterus (Siluriformes: Trichomycteridae) from the Andean Cordillera of Perú, with comments on relationships within the genus

Trichomycterus megantoni, new species, is described from several localities on the Andes of Perú at 1,360 to 2,200 m elevation. The new species differs from all congeners in the possession of autapomorphic characters: ventral interopercle with thickened integument and a reduced foramen in the frontal-supraoccipital. It is further distinguished by the following combination of characteristics: the tip of the pelvic fin when depressed does not reach the anus, the presence of a premaxilla rectangle, the first dorsal fin pterygiophore insertion at or posterior to vertebra 19 to 21, the supraorbital canal with pore 3, the outer tooth row with conic teeth, the head muscles not hypertrophied, the first pectoral fin ray prolonged as thin short filament, the possession of 17 pairs of ribs on each side, and 37 to 40 vertebrae.

The Life and Death of a Tungsten Hairpin Filament

Many words have been written about filament saturation and filament life, not all with years of experience behind them] Sometimes when visiting laboratories one has the feeling that the life of the filament is far more important than the quality of the results, so let us try to demystify filament life?The life of a tungsten hairpin filament very much depends upon its use and the applications present in a particular laboratory. Medturn to low magnification applications in the transmission electron microscope (TEM) may only require low emission currents (10 to 15 micro amps) with a long filament life resulting. High resolution studies require higher operating currents (20 to 45 micro amps) but, by demanding more emission current the life of the filament will suffer. Whilst a long filament life is good for the laboratory, it is not worthy of boasting, for those who have a short filament life may well be using the instrument near to the limit of its performance, a far more relevant boast!

Ultrastructural analysis of the dynactin complex: an actin-related protein is a component of a filament that resembles F-actin.

The dynactin complex visualized by deepetch electron microscopy appears as a short filament 37-nm in length, which resembles F-actin, plus a thinner, laterally oriented filament that terminates in two globular heads. The locations of several of the constituent polypeptides were identified on this structure by applying antibodies to decorate the dynactin complex before processing for electron microscopy. Antibodies to the actin-related protein Arp1 (previously referred to as actin-RPV), bound at various sites along the filament, demonstrating that this protein assembles in a polymer similar to conventional actin. Antibodies to the barbed-end actin-binding protein, capping protein, bound to one end of the filament. Thus, an actin-binding protein that binds conventional actin may also bind to Arp1 to regulate its polymerization. Antibodies to the 62-kD component of the dynactin complex also bound to one end of the filament. An antibody that binds the COOH-terminal region of the 160/150-kD dynactin polypeptides bound to the globular domains at the end of the thin lateral filament, suggesting that the dynactin polypeptide comprises at least part of the sidearm structure.