English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Winogradsky (1890) showed that the organism of nitrosofermentation is capable of growing in a medium completely void of fixed organic matter when in presence of ordinary air. He proved, thereby, that the organism must derive its carbon from one or all of the following sources; the mineral carbonates, the free carbon dioxide, or the volatile organic compounds of the atmosphere. That a source of carbon is found and utilized by the organism is supported by the fact that analysis of the culture liquid after nitrosofermentation has taken place shows it to contain an appreciably greater quantity of carbon than it did before the fermentation was activated by inoculation. Godlewsky (1892, 1895) as well as Winogradsky and Omeliansky (1899), found that cultures of nitrite and nitrate-forming organisms lacking free or combined carbon dioxide could not develop. In discussing the experiments of Winogradsky, above referred to, Beijerinck (1903), points to the possibility that the carbon was not fixed by the cells but by the magnesium oxide present in the basic carbonate used by this investigator. If this criticism were true it is hard to understand why the ratio of "nitrogen nitrified" to "carbon assimilated" should be a constant value. It might be assumed that the results of Ashby (1907-8), (soon to be related) could support Beijerinck's hypothesis, but close scrutiny shows them to bear a different significance. 479

ON NITRIFICATION IV. THE CARBON AND NITROGEN RELATIONS OF THE NITRITE FERMENT