Spirostomum Teres A small spirostomum (~400 microns) with a distinctive pill-shaped macronucleus. Collected in a grassy marsh by a riverbank in Perth, Ontario.
PROTOZOA REMIX CHORUS Here's the song for our project on, PROTOZOA It's about paramecium caudatum Hopefully you'll learn a lot of stuff about PROTOZOA They are really, really interesting. Verse 1 They're members of the phylum Ciliophora They have cilia that line the cell membrane The cell membrane is surrounded by protein layer called a pellicle CHEA! UGH! Water sweeps food into the mouth pore The food is digested in a food vacuole Then undigested food is expelled from the *** pore The macronucleus contains the DNA The micronucleus exchanges DNA in conjugation CHORUS Here's the song for our project on, PROTOZOA It's about paramecium caudatum Hopefully you'll learn a lot of stuff about PROTOZOA They are really, really interesting. Verse 2 \ilia live in aquatic and fresh water cribs Lots of them live in small ponds and slow moving streams With plants and decaying organic matter They reproduce a***ually by binary fission This is when only the micronucleus divides by mitosis The macronucleus elongates until it splits in half Sometimes ***ual reproduction occurs by conjugation Huh? What? Conjugation! CHORUS
Vorticella (Glockentierchen) at work Here we see two Vorticellae ingesting bacteria etc. The scope of the video is to show the macronucleus (MA) and the contractile vacuole (CV). Please look at my website "www.dr-ralf-" for more.
Ciliate Cell Division -- Spirostomum sp. Spirostomum (possibly s. intermedium or s. minus), about 800 microns long, undergoing division. The macronucleus seems to be condensing and dividing, as it does in the larger species S. Ambiguum (see Ann Bishop, Quarterly Journal of Microscopical Science, October 1925). At 1:00 the creature evacuates its characteristic contractile vesicle. At 1:27 you can see what looks like a new vesicle forming in the anterior "daughter."
Climacostomum Climacostomum (possibly C. virens without zoochlorellae), a flexible heterotrich ciliate, ~200 microns in length, collected from a pond in Wakefield, Quebec. It has a conspicuous, curved, tubular cytopharnyx, and a large posterior contractile vacuole. Climacostomum virens, the only species that has been studied in detail, is usually described as having a long, coiled macronucleus, which is not the case in this specimen. On his excellent and useful website, Dr. Xu Kaiqin states that the macronuclues in Climacostomum "may be spherical or ribbon-like." www.nies.go.jp
Reading Genomes Bit by Bit - Sean Eddy, Ph.D. A Decade with the Human Genome Sequence: Charting a Course for Genomic Medicine NHGRI hosted a day-long scientific symposium on Friday, Feb. 11, 2011, 8:30 am - 5:00 pm at the Ruth L. Kirschstein Auditorium, Natcher Conference Center on the National Institutes of Health (NIH) campus. The goal of the symposium was to offer the NIH community an exciting glimpse into contemporary genomics research, illustrating how genomics can be used to further medical discoveries and how genomics relates to individuals, communities and societies. More: www.genome.gov
Homalozoon Vermiculaire A long ciliate (~600 microns) with a moniliform macronucleus, and a distinctive granular mass near the "mouth."
Synthesis of pre-rRNA and mRNA is directed to a chromatin-poor compartment in the macronucleus of t From the Springer article: Synthesis of pre-rRNA and mRNA is directed to a chromatin-poor compartment in the macronucleus of the spirotrichous ciliate Stylonychia lemnae by: Postberg, Jan; Alexandrova, Olga; Lipps, Hans J.; A 3D reconstruction illustrates that delimitated chromatin spots occasionally observed in the interior of nucleolar bodies in single optical sections are built up by chromatin invaginations into such a body, showing that they in fact are localized beyond the interior of these spherical structures. The surface was rendered using To-Pro-3 counterstaining. AVI movie file (2.9 Mb). Journal: Chromosome Research Vol. 14 Issue 2 DOI: 10.1007/s10577-006-1033-x Published: 2006-03-01