Food is moved through the digestive tract of fruit fly larvae when the muscles that circle the wall of the intestine contract.
Love may seem like war sometimes, but within the reproductive tract of female fruit flies, a true battle rages: Sperm from different male flies compete head-to-head for a chance to fertilize the precious eggs.
The leishmanial parasites assume two forms: a round or oval leishmanial stage, which lives and multiplies in the vertebrate host; and an elongate, motile, flagellated organism called a leptomonad, which is found in the alimentary tract of the sand fly.
The reproductive tract of the female fly has only circular muscles and no longitudinal muscles.
Leishmania parasites develop to a transmissible and infective form entirely within the confines of the alimentary tract of the sand fly, in contrast to numerous other arthropod-borne pathogens.
Zurek et al. isolated Providencia rettgeri and Providencia stuartii from the intestinal tracts of house fly larvae collected from corn silage and turkey bedding (Zurek et al. 2000).
This was followed by similar reports of CAG-triplet repeats encoding pQ tracts in other regulatory genes of flies (Kassis et al. 1986), yeast (Pinkham et al. 1987; Suzuki et al. 1988; Bricmont et al. 1991; White et al. 1991) and other fungi (Yuan et al. 1991), mammals (Courey and Tjian 1988), and insect viruses (Carson et al. 1991).
The life cycle of the Leishmania parasite is characterized by two distinct morphologies (Scheme 1): the elongated and flagellated promastigote, found in the alimentary tract of the female sand fly vector, and the round nonmotile amastigote, present in the bloodstream and tissues of the mammalian host.
This was not a result of altered development, as adult onset induction of ndi1 in ISCs/EBs, using the 5961GS driver, was sufficient to decrease the proportion of flies with dye outside of the digestive tract with age.
This species is found alternately in the digestive tract of an insect vector, the tsetse fly, and the bloodstream of a mammalian host.
