Digitale Medien
Oxford, UK
:
Blackwell Publishing Ltd
The @journal of eukaryotic microbiology
2 (1955), S. 0
ISSN:
1550-7408
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
Notizen:
SUMMARY. Six species of Polytomella were isolated in pure culture from ecologically very different places where they may have only survived as cysts, but one of them was found in enormous numbers between rotting hemp in Italy. This shows that apparent rarity of the members of the genus may be caused by the restricted occurrence of suitable conditions which are characterized by abundance of organic nutrients and a certain low degree of acidity.The species differ only in minor morphological features, except for one of them which has for instance an eye-spot. This is also the only one the nutrition of which deviates from that of the rest.Under auxotrophic conditions with acetate as the only organic nutrient except thiamine, and in media containing acetate, peptone and yeast extract, growth is satisfactory, but it becomes luxuriant in yeast digest even without addition of an independent energy and carbon source. Starch is then still deposited but to some extent replaced by oil.The production of cysts, which survive desiccation, is an important ecological feature.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1550-7408.1955.tb02413.x
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