Fungal parasites of bdelloid rotifers: Diheterospora

1985 ◽  
Vol 63 (2) ◽  
pp. 211-222 ◽  
Author(s):  
G. L. Barron
Keyword(s):  
Bdelloid Rotifers ◽  
Fungal Parasites ◽  
First Time

Descriptions and illustrations are given for 12 species of Diheterospora recovered from parasitized rotifers in Ontario. Four of these species have been previously described and eight are described for the first time.

Two new fungal parasites of bdelloid rotifers

1981 ◽  
Vol 59 (8) ◽  
pp. 1449-1455 ◽  
Author(s):  
G. L. Barron
Keyword(s):  
Bdelloid Rotifers ◽  
Rapid Injection ◽  
Fungal Parasites

Haptoglossa humicola (Oomycetes) and Tolypocladium trigonosporum (Hyphomycetes) are described as new endoparasites attacking rotifers, belonging to the genera Adineta and Philodina, in soil. In H. humicola the laterally biflagellate zoospores produce spherical cysts each of which then germinates to form a specialized injection cell. The host is attacked by means of rapid injection of a sporidium through the cuticle. Each sporidium produces a thallus inside the host which at maturity functions as a zoosporangium. In T. trigonosporum, after infection, a network of curved anastomosing fertile hyphae produces a loose shell around the encysted host. Conidia are not produced under water, but in air these fertile hyphae give rise to solitary or clustered phialides and triangulate conidia.

scholarly journals Biological Activities of Four Adaptogenic Plant Extracts and Their Active Substances on a Rotifer Model

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Lilla Mácsai ◽  
Zsolt L. Datki ◽  
Dezső Csupor ◽  
Attila Horváth ◽  
Zoltán P. Zomborszki
Keyword(s):  
Deleterious Effect ◽  
Withania Somnifera ◽  
Biological Activities ◽  
Rhodiola Rosea ◽  
Cinnamyl Alcohol ◽  
Bdelloid Rotifers ◽  
Pure Substances ◽  
First Time ◽  
Active Substances

Rotifers have been widely used as well-characterized models of aging, since their multiorgan character makes them suitable as in vivo toxicological and lifespan models. Here we report the assessment of four adaptogenic plants and their extracts for the first time in this model. The effects on rotifer viability of extracts and characteristic active markers of Panax ginseng, Withania somnifera, Leuzea carthamoides, and Rhodiola rosea were tested in vivo. The crude extracts were nontoxic to Philodina acuticornis bdelloid rotifers; however, the pure substances of the plants influenced negatively the viability. Ginsenoside Rb1 and secondary metabolites of Withania somnifera exerted deleterious effect on the animals. The aglycone tyrosol and cinnamyl alcohol (from Rhodiola rosea) were more toxic than their glycosides salidroside and rosavin. Although the 20-OH-ecdysone and ajugasterone C (from Leuzea carthamoides) are chemically very similar, the latter was less toxic.

Fungal parasites of rotifers: two new verticillate endoparasites with aerial conidiophores

1980 ◽  
Vol 58 (4) ◽  
pp. 432-438 ◽  
Author(s):  
G. L. Barron
Keyword(s):  
New Species ◽  
Bdelloid Rotifers ◽  
Resting Spores ◽  
Fungal Parasites

Diheterospora rotiferorum and Diheterospora ovispora are described as new species endoparasitic on bdelloid rotifers belonging to Philodina and Adineta. In both species resting spores (aleuriospores) are produced underwater and disseminative spores (phialoconidia) are produced from aerial conidiophores. Verticillium reniformis and Acrostalagmus tagenophorus, also endoparasites of rotifers, are transferred to the genus Diheterospora.

A new and five rare bdelloids from Korea

Zootaxa ◽  
2017 ◽  
Vol 4242 (3) ◽  
pp. 529 ◽  
Author(s):  
MIN OK SONG ◽  
CHANG-HO LEE
Keyword(s):  
New Species ◽  
Rare Species ◽  
Taxonomic Study ◽  
Mitochondrial Cytochrome ◽  
Bdelloid Rotifers ◽  
Terrestrial Habitats ◽  
The Antarctic ◽  
First Time ◽  
A New Species ◽  
I Gene

A taxonomic study on bdelloid rotifers collected from various terrestrial habitats at six different locations in Korea yielded 12 new Korean records and a new species, Philodina koreana n. sp. Among the 12 new Korean records, eight species and two subspecies are new to Asia. These new Asian records include five rare species with poorly known distributions. Philodina childi Milne and P. scabra Milne were rediscovered in Korea almost 100 years after the original descriptions from South Africa. Our study is the first to report Habrotrocha longicalcarata Bērzinš outside its type locality. Macrotrachela nixa Donner has previously been reported only from New Zealand and the Antarctic after description from Spain. Finally, H. solida Donner is recorded outside Europe for the first time. Here, we provide a description of the new species and discuss the taxonomy and distribution of these five rare species. In addition, a partial sequence of mitochondrial cytochrome c oxidase subunit I gene (mtCOX1) for P. koreana n. sp. as well as a taxonomic key for the Philodina species recorded from Korea to date are also provided here. 

Fungal Parasites of Bdelloid Rotifers: A New Phialophora

Mycologia ◽  
1984 ◽  
Vol 76 (6) ◽  
pp. 1107 ◽  
Author(s):  
G. L. Barron ◽  
E. Szijarto
Keyword(s):  
Bdelloid Rotifers ◽  
Fungal Parasites

Fungal Parasites of Bdelloid Rotifers: A New Phialophora

Mycologia ◽  
1984 ◽  
Vol 76 (6) ◽  
pp. 1107-1110 ◽  
Author(s):  
G. L. Barron ◽  
E. Szijarto
Keyword(s):  
Bdelloid Rotifers ◽  
Fungal Parasites

Anciently Asexual Bdelloid Rotifers Escape Lethal Fungal Parasites by Drying Up and Blowing Away

Science ◽  
2010 ◽  
Vol 327 (5965) ◽  
pp. 574-576 ◽  
Author(s):  
C. G. Wilson ◽  
P. W. Sherman
Keyword(s):  
Bdelloid Rotifers ◽  
Drying Up ◽  
Fungal Parasites

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.

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