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The nature of the plasmoptyzate growth factor for colpoda duodenaria

✍ Scribed by Van Wagtendonk, W. J. ;Taylor, C. V.

Publisher: Wiley (John Wiley & Sons)
Year: 1942
Tongue: English
Weight: 380 KB
Volume: 19
Category: Article
ISSN: 0095-9898
DOI: 10.1002/jcp.1030190109

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✦ Synopsis

I K'rllol) I-("l'lOs

Tt was showii in a prerious paper (Taylor aiid van T'agteiidonk, '41 a ) that Colpoda duodcnarin iii pure culturc is able to grow in a sterile medium, coiiiposed of n ,i% biwvers ?cast ex%-tract aiid a plasmoptyzate of Pseudomonas fluorescens RI: 33.1. I n this medium tlic ciliates reproduced a t a rate equal to that wlieii fcd with living Psendoiiioiitis sp. Tt was also slio\vii that tlic fnctoi.s in the plasiiioptyzatc t i i ~ l'cust cxtixct is kiiowii to bc a rich sourcc of most of tlie rccoyiizctl vitamins and growth factors for various iiiicro-organisms. Colpocla duodenaria, however, requires in addition to these substances a lieat labile factor supplied by the bactriial ~~~~~1 ~i o ~) t ~~i i t ~.

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