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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104564
Title Aspects of nitrogen assimilation by cultures of green algae
show extra info.
door L.H.J. Bongers
Author(s) Bongers, L.H.J.
Publisher Wageningen : Veenman
Publication year 1956
Description 52 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Wassink, Prof. Dr. E.C.
Graduation date 1956-12-21
Dissertation no. 215
Author abstract show abstract
The N/C relation in green algae was about 0.2, but with N starvation this ratio may decline to 0.04. Such treatment also decreased the chlorophyll content of the cells as well as the rates of photosynthesis and growth.

Supply of substrate N to N-starved algae resulted in formation of cells of 'normal' character. At pH values of 7 to 8, both NO 2- and N0 3- were assimilated at approximately the same rate.

Algae of normal N/C relation did not assimilate substrate N (NO 2 - or NO 3 -) if illuminated without a carbon source. Instead, NO 3 - and NO 2- became reduced and NH 3 was excreted into the surrounding medium.

In weak light, the rate of NH 3 excretion (i.e. reduction of NO 3 - in the absence of CO 2 ) was equivalent to the rate of CO 2 reduction (in the absence of N0 3- ); if both substrates ( NO 3- + CO 2 ) were present together both rates decreased, indicating competition for the same reduction.

In strong light (without CO 2 ) the rate of NO 3- conversion into NH 3 was a fifth of the rate of CO 2 reduction. Nitrate and carbon dioxide did not compete for the reduction in strong light.

It was concluded that nitrate reduction was not necessarily dependent upon products of photosynthesis.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,215
Keyword(s) (cab) chlorophyta / assimilation / nitrogen / sulfur / phosphorus
Categories Chlorophyta
Publication type PhD thesis
Language English
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