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Cytology and origin of a tetraploid Trichosanthes palmata Roxb.
Cytology of male plants of a tetraploid Trichosanthes palmata Roxb. has been studied. The plants showed 44 chromosomes in root tip cells. Chromosomal...
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Endopolyploidie im Endosperm vonEchinocystis lobata
The nuclei in the endosperm of Echinocystis lobata show a considerable increase in size; this is due to endomitotic polyploidization. Particularly the...
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Fine structure changes in the development of the nodules of Trifolium subterraneum L. and Medicago tribuloides Desr.
Electron microscope observations of thin sections of nodules of subterranean clover and barrel medic, after fixation in KMnO 4 or OsO 4 , show that...
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Chemical modifications in osteones during calcification
In order to establish the chemical modifications which may occur, at a microscopic level, during the calcification process in bone, some inorganic...
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Biological aspects of symbiotic nitrogen fixation
The subject of symbiosis between the root nodule bacteria and leguminous plants, as reflected in the practical significance of nitrogen fixation, has...
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Development of the bacteroid in the root nodule of barrel medic (Medicago tribuloides Desr.) and subterraneum clover (Trifolium subterraneum L.)
The development of the bacteriod is traced from thin sections of slices of nodules fixed in KMnO 4 and OsO 4 . While in the infection thread the Rhizobium ...
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Molecular biological taxonomy of some free-living nitrogen-fixing bacteria
A novel approach to the taxonomy of several free-living nitrogen-fixing bacteria is proposed on the basis of two DNA parameters. 1) DNA base...
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The effect of aging of human red cells in vivo on their fatty acid composition
Using improved methods for fatty acid analysis and a density gradient method for separation of red cells according to age, we analyzed the fatty acid...
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The movement of materials into plants Part I. Osmosis and the movement of water into plants
The fundamental principles of osmosis are reviewed. A scheme is presented for mathematically dealing with the osmotic quantities, expressed as...
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Third International Congress of Histochemistry and Cytochemistry
The tissue distribution of enzymatic activities in intestinal metaplasia stomachs exhibiting chronic gastritis was compared histochemically with that...
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Cytochemical Methods
Two major divisions of approach to the identification of cell constituents may be distinguished: 1) the attempt to show the localisation of...
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Origin and developmental physiology of root nodules
Leguminous root nodules were considered by early investigators to originate in the infection and metamorphosis of a lateral root primordium. This...