Donald F. Poulson

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The copper-accumulating region of the midgut is a mosaic of interstitial and cup-shaped, copper-accumulating cells. The cup of each cuprophilic cell is lined with a highly refractile border of long microvilli except in one strain where it is predominantly lamellar. The nucleus lies basally; the basal plasma membrane is fairly extensively infolded.(More)
John Y. Bassett through the medium of Osler's essay. Osler was impressed, and he accorded Bassett the title An Alabama Student; it seems a trifle unfair to either Osler or Alabama to change, on the title-page of the present volume, the "An" to the more definite "The." It is unfortunate, also, to note that the present text is not an exact reprinting of the(More)
Several lines of evidence implicate small spirochetes, presumably treponemata, as etiologic agents in the production of the maternally transmitted "sex ratio" condition (SR) in Drosophila nebulosa, in D. willistoni, and in strains of D. melanogaster into which the SR condition has been artificially transferred. The presence of treponemata in the hemolymph(More)
HE infectious nature of the maternally transmitted “sex-ratio’’ condition, TSR , in Drosophila willistoni has been clearly established ( MALOGOLOWKIN and POULSON 1957; MALOGOLOWKIN, POULSON and WRIGHT 1959) and it has been demonstrated that the infectious SR agent is present at high levels in the hemolymph of adult SR females of that species (SAKAGUCHI and(More)
A study was made ofwillistoni-SR infections, transmitted for many generations through the maternal line, in two wild-type strains ofD. melanogaster. As in the species of origin, the SR agent is essentially lethal only to males. The twomelanogaster strains differ from each other in the time required for the effects of SR to be expressed, both in terms of the(More)