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The body fluids immune mice have not been observed have any direct cytolytic action tumor cells either in the test tube or in the body the immune animals.

Immunity homoioplastic implants thus appears differ from that produced the injection the tissue phd dissertations a foreign species in which cytolysins, precipitins, opsonins, The possible importance intercurrent bacterial infection in tumor immunity has cheap custom essays been emphasized Pitzman, who claims that infected tumors confer protection, whereas noninfected tumors not. This not in accordance with many well established isucta, and especially difficult this basis account for the constant appearance an inflammatory reaction around implants in one variety and its absence Two phases the life cycle brought light our investigations have a possible bearing the interrelations host and intestinal flagellate parasites and sources pathogenicity the latter. It well known that the period schizogony in the malarial parasite marks the climax its biochemical assault upon its host. There some very incomplete evidence that both binary and multiple fission in these intestinal flagellates periodic, and pervading, though none that this periodicity regular.

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Hosts in which either process occurs are relatively rare, and though mitosis may found sparingly in many host? there are some instances in our records in whidi was exceedingly abundant in a given host.

Multiple fission in like manner restricted a few host individuals among the numerous ones examined In the case Trickonuytias augtuta these were found mainly in the months July and August. These facta point toward the cyclic occurrence these phenomena reproduction among these parasites.

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A second phenomenon interest in this connection the occurrence at mitosis among these parasitic forms generally, the intranuclear chromidial cloud followed, in some cases at least, as in Trkhomonas attgutta, the increase in the number extranuclear chromidia, and in the amount extranuclear chromatin or deeply staining substance in the cytoplasm.

Similar conditions attend the mitotic phases multiple fission in this form.

In some other flagellates, as in Giardia at the time mitosis, the parabasal body fades away. There are thus indications that at the time mitosis the metabolic processes the organism involve need help writing narrative essay an unusual activity the part the chromidial and extranuclear stainable substances the cytoplasm.

Moribund individuals with an unusual amount such cytoplasmic inclusions occur in hosts diich binary or multiple fission in progress. There a possible basis here for a climax in the toxic effect the parasite its host at these periods reproduction.

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Still another feature the action the parasite upon its host recognized in its ceaseless motor activities and in the tendencies for the fission stages, both binary and multiple, creep about upon or into the intestinal epithelium. They become at these periods sources stimulus or irritation the epithelial cells and may possibly open lesions for the entrance bacteria into the blood stream their host.

The enormous numbers Oiardia in the mammal and Crithidia in niptera are sudi that with their habit attachment the intestinal cells they form a veritable living carpet the walls the infected region the intestine. accompany inflation the intestine locally, the acciimulation a viscid yellowish gelatinous mass in the lumen, the thinning out and breaking down the intestinal epithelium, and they may even create lesions and enter the blood stream. Their mobility the sur M the intestinal cells, their tendency creep into the crypts and even into the wall itself creates a source local stimulus or even. Their cyclic reproductive processes with accompanying fluctuations in metabolic activity indicated varying amounts chromatic materials in the cytoplasm and creates a basis for a climax in their biochemical relations their hosts. 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