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A CAL model of the nitrogen cycle that calculates the amounts of nitrogen in the major transformation of the nitrogen cycle in grazed grassland. It presents the results as a dynamic display, with which the...
Concentrates on a suggested model for the operations of the two proteins of the nitrogenese enzyme which bacteria use to fix nitrogen. First shows how root modules of legumes possess nitrogen fixing...
The second of three working videos course S343. [See synopses of individual programmes for details of content.]
Investigates some of the recent biochemical and genetic advances in the understanding of biological nitrogen fixation. Experiments at Rothamsted in the mid-19th century proved that nitrogen was essential for...
Discusses the biological nitrogen cycle; fixation processes; biological reduction of dinitrogen; metal content of nitrogenase proteins; dinitrogen complex of ruthenium and molybdenum; production of hydrazine...
Describes the normal processes of infection of clover root hairs by root-nodule bacteria and subsequent nodule formation. Shows the root-hair surface using scanning electron microscopy, the initiation of...
With the increasing demand for new and improved pastures and high protein food crops, research is seeking to develop better strains of nodulated legumes both for temperate and tropical agriculture. The...
Describes an experiment in the International Biological Programme to estimate the amount of atmospheric nitrogen fixed by lucerne (alfalfa). Infection of root hairs by nodule bacteria and the development of...
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