Biology And Life Cycle

Trichomonas are flagellated protozoan, which vary in size and shape. In axenic culture they are usually pear-shaped ranging in size from 4 to 30 mm, but when attached to epithelial cells the amoeboid forms are predominant.[4] Organisms of the genera Trichomonas are characterized by possessing a single nucleus and five flagella, four of which are free and located at the anterior portion, and the fifth is a recurrent anterior flagellum, which is attached to the body as an undulating membrane. The cell body is longitudinally bisected by a thin hyaline structure, the axostyle, which starts at the nucleus and protrudes from the posterior end of the parasite.[5] The nucleus located in the anterior portion has a porous double membrane characteristic of a eukaryotic cell; the Golgi complex is also highly developed. The cytoplasm is rich in glycogen granules and ribosomes, but lacks mitochondria, peroxi-somes, or glycosomes.[4]

Trichomonas exist only as trophozoites; they lack a cystic stage and reproduce generally by longitudinal binary fission without disappearance of the nuclear envelope.[4] Mitosis in T. vaginalis has been well characterized and includes the four mitotic phases: prophase, metaphase, anaphase, and telophase;[6] the chromatin condenses to six chromosomes;[7] no recent data on the mitotic division exist for T. tenax.

The genome of T. vaginalis has been estimated to be approximately 2.5 x 107 bp with only 33% of unique sequences.1-8-1 The overall content of G+C was estimated to be about 36%. Trichomonas vaginalis has six mono-centric chromosomes, which seem to be haploid.[7,9] However, 0.1% of the population displays diploid meta-phases with some cells exhibiting four nuclei suggesting a possible occurrence of meiotic division.[7-

No extra nuclear DNA is present in Trichomonas; detection of extra chromosomal DNA in the hydro-genosome was looked for but not found.[8,10]

Getting Started With Dumbbells

Getting Started With Dumbbells

The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.

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