Stomatocysts of Chrysastrella paradoxa Chodat (Chrysophyceae) from herb-mosses mire at the western slope of the Subpolar Urals (Russia)

2021 ◽  
pp. 80-84
Author(s):  
Irina N. Sterlyagova ◽  
Elena N. Patova ◽  
Dmitry A. Kapustin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Western Slope ◽  
Subpolar Urals ◽  
Scanning Electron

Stomatocysts of Chrysastrella paradoxa was observed in a herb-mosses mire on the territory of “Yugyd va” National Park (the Subpolar Urals, Russia). The morphology of stomatocysts was studied by scanning electron microscopy. This is the second record of Ch. paradoxa in Russia.

Morphology of Chrysastrella paradoxa stomatocysts from the Subpolar Urals (Russia) with comments on related morphotypes

Phytotaxa ◽  
2019 ◽  
Vol 402 (6) ◽  
pp. 295
Author(s):  
DMITRY KAPUSTIN ◽  
IRINA STERLYAGOVA ◽  
ELENA PATOVA
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Type Species ◽  
Subpolar Urals ◽  
Mass Development ◽  
Scanning Electron

For many years Chrysastrella Chodat has been a cyst genus but recently it has been re-instated and re-defined. Currently, Chrysastrella contains Ochromonas-like flagellates including O. tuberculata Hibberd which was synonymized with the type species, Chrysastrella paradoxa Chodat. A mass development of stomatocysts, which we identified as Ch. paradoxa, was observed in a bog on the territory of “Yugyd va” National Park (the Subpolar Urals, Russia). The morphology of stomatocysts was studied by scanning electron microscopy and compared with previously described similar morphotypes. Stomatocysts #80 Hansen, #1 Wołowski & Płachno and #4 Bai & Chen seem to be identical to Chrysastrella paradoxa stomatocysts and we propose to reduce them to synonymy.

scholarly journals A reexamination of Yuknessia from the Cambrian of British Columbia and Utah

2015 ◽  
Vol 89 (1) ◽  
pp. 82-95 ◽  
Author(s):  
Steven T. LoDuca ◽  
Jean-Bernard Caron ◽  
James D. Schiffbauer ◽  
Shuhai Xiao ◽  
Anthony Kramer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
British Columbia ◽  
National Park ◽  
Red Alga ◽  
Fine Scale ◽  
Burgess Shale ◽  
Phylogenetic Affinity ◽  
New Material ◽  
Scanning Electron

AbstractTo investigate the phylogenetic affinity of Yuknessia simplex Walcott, 1919, scanning electron microscopy was applied to the Burgess Shale (Cambrian Series 3, Stage 5) type material and to new material from the Trilobite Beds (Yoho National Park) and specimens from the Cambrian of Utah. On the basis of fine-scale details observed using this approach, including banding structure interpreted as fusellae, Yuknessia Walcott, 1919 is transferred from the algae, where it resided for nearly a century, to the extant taxon Pterobranchia (Phylum Hemichordata). Considered as such, Yuknessia specimens from the Trilobite Beds and Spence Formation (Utah) are amongst the oldest known colonial pterobranchs. Two morphs regarded herein as two different species are recognized from the Trilobite Beds based on tubarium morphology. Yuknessia simplex has slender erect tubes whereas Yuknessia stephenensis n. sp., which is also known in Utah, has more robust erect tubes. The two paratypes of Y. simplex designated by Walcott (1919) are formally removed from Yuknessia and are reinterpreted respectively as an indeterminate alga and Dalyia racemata Walcott, 1919, a putative red alga.

Redescription of Lamproglena Clariae Fryer, 1956 (Copepoda, Lernaeidae), With Notes On Its Occurrence and Distribution

Crustaceana ◽  
1996 ◽  
Vol 69 (4) ◽  
pp. 509-523 ◽  
Author(s):  
A. Avenant-Oldewage ◽  
Hazel M. Marx
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Kruger National Park ◽  
Gill Parasite ◽  
Morphological Findings ◽  
Olifants River ◽  
First Time ◽  
Scanning Electron

AbstractThe morphology of the gill parasite Lamproglena clariae Fryer, 1956, from the Olifants River, Kruger National Park, South Africa, was studied with the aid of light and scanning electron microscopy. Ultrastructural details of all appendages are given as well as a table and map with information on the occurrence and distribution of L. clariae in Africa. Important morphological findings include: the observation of only one claw on the maxilla; first time findings and descriptions of the nuchal organ, upper and lower lips, the fifth pair of legs and circular openings on all appendages.

Pestalotiopsis guepinii, a Taxol-producing Endophyte of the Wollemi Pine, Wollemia nobilis

1997 ◽  
Vol 45 (6) ◽  
pp. 1073 ◽  
Author(s):  
Gary A. Strobel ◽  
W. M. Hess ◽  
Jia-Yao Li ◽  
Eugene Ford ◽  
Joe Sears ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Anticancer Drug ◽  
Endophytic Fungi ◽  
National Park ◽  
Hydrophobic Surfaces ◽  
Taxus Brevifolia ◽  
Native Birds ◽  
Scanning Electron ◽  
Sydney Australia

Wollemia nobilis (Wollemi pine), an araucariaceous plant, whose closest known relatives are from the Jurassic period, occurs in the Wollemi National Park near Sydney, Australia. This tree is host to many endophytic fungi, including Pestalotiopsis guepinii which produces taxol, an important anticancer drug. It was shown by immunological, spectroscopic and chromatographic means to be identical with authentic taxol obtained from Taxus brevifolia (Pacific yew). Since the Wollemi pine does not produce taxol, how might a taxol-producing fungus be present in this unusual tree? Spores of P. guepinii possess several appendages which strongly interact with hydrophobic surfaces including plastics and the pinnae of birds’ feathers. Scanning electron microscopy of the conidia of P. guepinii clearly shows the spores on the feathers of a green-checked conure and a cockatiel. Conceivably, the fungus may have acquired the ability to produce taxol from a foreign or local yew and then is carried to the Wollemi pine site by native birds.

Two new species of the genus Mallomonas from the Cat Tien National Park (Viet Nam): Mallomonas distinguenda and Mallomonas skvortsovii

Phytotaxa ◽  
2016 ◽  
Vol 273 (1) ◽  
pp. 59 ◽  
Author(s):  
EVGENIY S. GUSEV ◽  
HAI DOAN-NHU ◽  
LAM NGUYEN-NGOC ◽  
DMITRY A. KAPUSTIN
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Viet Nam ◽  
Scale Morphology ◽  
Silica Scale ◽  
Two New Species ◽  
Means Of Transmission ◽  
Cat Tien National Park ◽  
Scanning Electron

Mallomonas distinguenda sp. nov. and Mallomonas skvortsovii sp. nov. are described from Dak Lua swamp, located in Cat Tien National Park (Dong Nai Province, Southeastern Viet Nam). The description is based on silica-scale morphology studied by means of transmission and scanning electron microscopy. These species belong to the section Papillosae based on scale morphology. The most characteristic feature for both taxa is the shield reticulation. In the case of Mallomonas distinguenda, it is an external reticulation. By contrast, Mallomonas skvortsovii has internal reticulation.

Oricymba rhynchocephala sp. nov., a new cymbelloid diatom (Bacillariophyceae) from Xianju National Park in Zhejiang Province, China

Phytotaxa ◽  
2018 ◽  
Vol 340 (1) ◽  
pp. 63 ◽  
Author(s):  
WEI ZHANG ◽  
GUANG-XIA SHANG ◽  
J. PATRICK KOCIOLEK ◽  
LI-QING WANG ◽  
RUI-LEI ZHANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
National Park ◽  
Zhejiang Province ◽  
Morphological Description ◽  
Similar Species ◽  
Apical Pore ◽  
Freshwater Diatoms ◽  
Scanning Electron

During a survey of freshwater diatoms from Xuedong stream in the Xianju National Park, Zhejiang Province, China, a new cymbelloid species, Oricymba rhynchocephala sp. nov. has been recorded. This species is assigned to the genus Oricymba by virtue of having a ridge separating the valve face and mantle, the presence of apical pore fields, stigma with a single external opening but two internal openings, and areolae with dentate occlusions. A detailed morphological description of the new species, O. rhynchocephala, is presented, based on light and scanning electron microscopy. Oricymba rhynchocephala sp. nov. is characterized by having a linear-lanceolate outline with slightly arched valve margins towards rounded and clearly rostrate apices, as well as radiate striae. The taxon is morphologically compared with similar species of the genus Oricymba. The new species, can be easily separated from other species in Oricymba by its obvious rostrate apices. The report of this new species from Zhejiang Province adds to our understanding the morphology and distribution of the genus Oricymba in China.

First Records of Freshwater Sponges (Porifera: Spongillidae) for Great Smoky Mountains National Park

2020 ◽  
Vol 95 (1) ◽  
pp. 59-62
Author(s):  
John E. Copeland ◽  
Stan C. Kunigelis ◽  
Emily A. Stuart ◽  
Kayleigh A. Hanson
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Taxonomic Identification ◽  
Freshwater Sponges ◽  
Great Smoky Mountains ◽  
Smoky Mountains ◽  
Scanning Electron

Abstract A survey of four selected streams in the Tennessee portion of the Great Smoky Mountains National Park was conducted to document the presence of freshwater sponges. Streams were surveyed by wading and observing rock and log substrates for sponges. Sponges were viewed with a 10X magnifier for gemmules. If gemmules were present a portion of the sponge containing gemmules was collected. Scanning electron microscopy of gemmules and spicules was used for taxonomic identification. Two species, Radiospongilla crateriformis and Trochospongilla horrida, were discovered. Both were found in the Abrams Creek embayment of Chilhowee Lake. These findings represent the first records of freshwater sponges within the Great Smoky Mountains National Park.

scholarly journals Calymperaceae, a new family to the bryological flora of Uruguay

2020 ◽  
Vol 55 (3) ◽  
pp. 359-367
Author(s):  
Richard A Cabral ◽  
Maria S. Jimenez ◽  
Guillermo M. Suárez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
National Park ◽  
Distribution Map ◽  
New Family ◽  
First Time ◽  
Scanning Electron

Background and aims. The aim of this work was to increase the knowledge of the bryoflora in Uruguay based on the analysis of samples collected in Fortaleza Santa Teresa National Park (Uruguay). M&M. Specimens were collected, processed and analyzed morphologically using conventional techniques for bryophytes. Microscopic characters were observed and illustrated with light microscopy (LM) and scanning electron microscopy (SEM). Results. Calymperaceae Kindb. is recorded for the first time to the country, represented by Syrrhopodon gaudichaudii Mont. This species is characterized by leaves strongly crispate when dry, and margins smooth to dentate at the apex. Conclusions. A detailed description, illustrations with SEM and LM, and a distribution map of S. gaudichaudii is here presented.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

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