Fig. 1 Life cycle of T. cruzi showing the four major forms of the parasite. Epimasigotes and amastigotes divide by binary fission, whereas both of the trypomastigote forms are nonreplicative. The small rounded nonflagellated amastigotes can grow in almost any mammalian cell type. In the image shown intracellular amastigotes can be identified as small red dots following DNA staining. The large red dot is the host cell nucleus. Amastigotes differentiate into bloodstream trypomastigotes, which are released after host cell lysis. These can reinvade other cells or be taken by an insect vector during a bloodmeal. (View this art in color at

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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