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@prettyprotozoa
Sybil Maree, for Shuter and Shooter Publishers, requests permission to publish 3 photos of rumen microbes - ophryoscolex, rod-shaped fibrobactor bacteria and protist for a new publication for Grade 12 Agricultural Sciences students in South Africa.
Hi Sybil! I don't own any of the pictures in this blog. The original source of each photo is linked in the post. Good luck!
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GULP! â Tetrahymena pyriformis fed Qdot streptavidin 585 and 605 (Q10113MP & Q10103MP; yellow & red particles in vacuoles), labeled with TubulinTracker Green (T34075; green kinety) & TO-PROÂŽ-3 (T3605; pseudocolored blue nuclei).
This summer an outbreak of Cyclosporiasis, an intestinal disease not commonly found in the US, has been making people in the middle and eastern US sick.
Cyclospora cayetanensis is a protistan (eukaryotic) parasite that is related to the organisms that cause malaria and toxoplasmosis....
Cyclospora update: The bagged lettuce that gave over 100 people in Iowa and Nebraska cyclosporiasis was traced to an American owned packaging plant in Mexico and served in Red Lobster and Olive Garden restaurants. Â The outbreak was far more widespread though, and authorities still do not know the source of Cyclospora in the other 14 states where people became sick.
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Microbes is a series of pen and ink drawings of microscopic slides by Cecilia AdorioÂ
Leptospironympha, a parasite of the wood-feeding cockroach Cryptocercus punctulatus.
Figures 10â15. SEM micrographs of Leptospironympha of Cryptocercus punctulatus showing symbiotic bacteria and surface details. 10. Symbiotic surface bacteria between flagellar bands of L. eupora (Scale bar=5 Îźm). 11, 12. Symbiotic surface bacteria on the posteriormost cell portion of L. wachula (Scale bars=3 Îźm and 2 Îźm respectively). 13. Granular particles on the flagella of L. eupora (Scale bar=1 Îźm). 14. Operculum of L. eupora, also showing flagella with a few granular particles (Scale bar=1 Îźm). 15. Anterior view of L. eupora showing the operculum and flagella with granular particles (Scale bar=2 Îźm).
from Carpenter KJ et al. 2010.  Phylogenetic Position and Morphology of Spirotrichosomidae (Parabasalia): New Evidence from Leptospironympha of Cryptocercus punctulatus. Protist 161(1):122â132.
Life cycles and cell death of parasitic protozoa Trypanosoma brucei, Leishmania spp., and Plasmodium falciparum.
from Proto WR et al. 2013. Cell death in parasitic protozoa: regulated or incidental? Nature Reviews Microbiol. 11:58-66.
Steinina ctenocephali, a parasite of the cat flea.
from Alarcón ME et al. 2011. Life Cycle and Morphology of Steinina ctenocephali (Ross 1909) comb. nov. (Eugregarinorida: Actinocephalidae), a Gregarine of Ctenocephalides felis (Siphonaptera: Pulicidae) in Taiwan. Zool. Studies 50(6): 763-772.
Six examples of protozoa (phagotrophic eukaryotes) that act as models. (a) Tetrahymena, a ciliate that has a versatile model role; image from the Open Access source. (b) The ciliates Paramecium and Didinium are used to evaluate predatorâprey dynamics among other roles; image kindly provided by K. Hausmann. (c) Oxyrrhis is a marine flagellate that is emerging as model for a range of topics; image by D. Patterson and provided courtesy of microscope.mbl.edu. (d) Trypanosoma is a blood parasite that provides a source of mitochondria among other attributes; image rights obtained from Eye of Science. (e) Dictyostelium is a soil amoeba that is possibly the most important medical-model protozoon; image kindly provided by R.L. Blanton. (f) Monosiga is a choanoflagellate that is emerging as a model because of its phylogenetic affinity to metazoa; image kindly provided by the King Laboratory, UC Berkeley.
from Montagnes D. et al. 2012. The rise of model protozoa. Trends in Microbiol. 20(4):184-191.
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Dileptus eating Tetrahymena (via)
Taxa present: 1. â Lobatula lobatula (Walker and Jacob); 2. â Elphidium macellum (Fichtel and Moll); 3. â Elphidium excavatum (Terquem); 4. â Elphidium advenum (Cushman); 5. â Elphidium complanatum (D'Orbigny); 6. â Elphidium crispum (LinnĂŠ); 7. â Rosalina globularis D'Orbigny; 8. â Nonion commune (D'Orbigny); 9. â Aubignyna perlucida (Heron-Allen and Earland); 10. â Haynesina germanica (Ehrenberg); 11. â Ammonia beccarii tepida (Cushman); 12. â Ammonia beccarii beccarii (LinnĂŠ); 13. â Asterigerinata mamilla (Williamson); 14. â Turrispirillina sp.; 15. â Spirillina vivipara Ehrenberg; 16. â Trichohyalus aguayoi (BermĂşdez). Umbilical view; 17. â Trichohyalus aguayoi (BermĂşdez). Spiral view; 18. â Trochammina inflata (Montagu); 19. â Miliolinella eburnea (D'Orbigny); 20. â Quinqueloculina vulgaris D'Orbigny; 21. â Cornuspira involvens (Reuss); 22. â Miliolinella circularis (Bornemann).
from BlĂĄzqueza AM and J Userab. 2010. Palaeoenvironments and Quaternary foraminifera in the Elx coastal lagoon (Alicante, Spain). Quaternary Inter 222(1-2):68-90.
Petalotricha ampulla
Hair and there
Ciliated protozoa, like these captured by Dylan Burnette of the National Institute of Child Health and Human Development using a confocal microscope (magnified 1,700X), are a diverse group of complex, single-celled organisms characterized by superficial hair-like organelles that they undulate to move themselves along. (Other motile protists have tails or false feet.)
Protozoa are abundant and common everywhere, found in ponds, lakes, rivers, oceans, soils and inside the human body. In the last case, that can be bad news since some species are parasitical and cause disease. Malaria, giardiasis, Leishmaniasis and dysentery are all examples of diseases involving protozoa, often transmitted to humans by the bite of a parasite-carrying insect.
Ciliates are frequently used to study basic mechanisms in evolution because they replicate both asexually and through sexual reproduction.
Asexual reproduction occurs by binary fission: The micronucleus undergoes mitosis and the macronucleus elongates and splits in half. The cell then divides in two. Both new cells have a copy of the micronucleus and macronucleus.
In sexual reproduction, genetic material is exchanged, called conjugation, between two organisms of different mating types. (Mating types is akin to gender but, in the case of ciliates, the number of mating types exceeds two.) Conjugation occurs when food is rare. Two cells form a bridge between their cytoplasms, their micronuclei undergo meiosis, macronuclei disappear and the haploid micronuclei are exchanged over the bridge. The cells then separate, form new macronuclei from their micronuclei, and divide to create four new cells.
Pretty complicated for a critter measuring less than two millimeters (the thickness of a nickel) in length.
Saccinobaculus sp. and Barbulanympha sp. (via)
The oxymonad protist Saccinobaculus (foreground, at about 12 microns in diameter) orbiting the much larger parabasalid protist Barbulanympha (background, at about 100 microns in diameter), which is covered in a dense monolayer of rod-shaped symbiotic bacteria. From the hindgut of the wood-feeding roach Cryptocercus. Images by Kevin J. Carpenter. (More)
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Dinoflagellates (via)
Dr Paul Hargreaves and Faye Darling call this electron microscopic image of dinoflagellates 'MiroMira2', but we think it looks like a couple of muffins. (More)
Ceratochoris horrida (via)
