• A critical evaluation of the prospects for nitrogen fixation with non-legumes.- Regulation of expression of genes for three nitrogenases in Azotobacter vinelandii.- Genetic characterization of nitrogen fixation in Enterobacter strains from the rhizosphere of cereals.- Analysis of nitrogenase reaction using monoclonal antibodies against -subunit of component I of A. vinelandii.- Involvement of GroEL in Klebsiella pneumoniae nif gene expression and nitrogenase assembly.- The effect of some terrestrial oligochaeta on nitrogenase activity in the soil.- Cassette mutagenesis of a proposed DNA-binding motif in klebsiella pneumoniae rpon (sigma 54).- Characterization of a mutant of Azotobacter chroococcum resistant to some fungicides.- A chromosomal linkage map of Azotobacter vinelandii.- Energy coupling and electron transfer in nitrogenase.- Fluctuation of the ara under elaeagnus angustifolia canopy.- The influence of root exudates on dinitrogen fixation of chosen free-living bacteria.- Soil redox potential in presence of azospirillum.- Biofertilization of maize with free-living nitrogen fixing bacteria: results of field trials on grain production.- Kinetics of kelthane uptake and distribution in azospirillum lipoferum.- Bioaccumulation of the acaricide kelthane (dicofol) by azospirillum lipoferum.- Effect of biofertilizers on controlling fusarium solani f. Sp. phaseoli.- Phyllospheric nitrogen fixing bacteria in tillandsia leaves.- Nif and nod genes in Azospirillum.- Control of nitrogenase in Azospirillum sp..- Biology of nitrogen-fixing bacteria.- Biological nitrogen fixation associated with sugar cane.- Physiological properties of Azospirillum brasilense involved in root growth promotion.- Regulation of the nifHDK genes transcription in Azospirillum brasilense.- Cloning ofthe nifA and nifB genes of Azospirillum brasilense strain FP2.- Regulation of nitrogen fixation genes in Azospirillum: characterization of A nif regulatory region.- Azospirillum-plant interaction: a biochemical approach.- Osmotollerance of diazotrophic rhizosphere bacteria.- Azospirillum-gramineae interaction: effect of indole-3-acetic acid.- DNA restriction fingerprint for the identification of Azospirilla.- Alteration in membrane potential and in proton efflux in plant roots induced by Azospirillum brasilense.- Effect of soil organic matter on chickpea inoculated with Azospirillum brasilense and Rhizobium leguminosarum bv. ciceri.- Active attachment of Azospirillum brasilense to root surface of non-cereal plants and to sand particles.- Association of Alcaligenes faecalis with wetland rice.- Sunflower inoculation with Azospirillum and other P.G.P.R..- Characterization of a pectinolytic activity in Azospirillum irakense.- Associative N2-fixation in plants growing in saline sodic soils and its relative quantification based on 15N natural abundance.- Genetic analysis of the Azospirillum plant-root interaction.- Dinitrogen fixation and infection of grass leaves by Pseudomonas rubrisubal-bicans and Herbaspirillum seropedicae.- Growth parameters of microaerobic diazotrophic rhizobacteria determined in continuous culture.- Infection of intact roots of kallar grass and rice seedlings by Azoarcus.- Strain-specific salt tolerance and chemotaxis of Azospirillum brasilense and their associative N-fixation with finger millet in saline calcareous soil.- Nitrate reductase activity of Azospirillum brasilense sp7 and sp245 V - and C -forms in continuous culture.- Microcalorimetric study of the growth of Azospirillum brasilense: relation between heat production and other growth parameters.- Nitrogen fixation in P- nodules of wheat roots by introduced free-living diazotrophs.- Firefly luciferase expression on nitrogen fixation with non-legumes.- Nucleotide sequence of regulatory regions of Azospirillum brasilense.- Nucleotide sequence and expression of an Azospirillum nod homologous region.- Isolation and characterization of TN5 induced Azospirillum brasilense mutants alterated in calcofluor straining.- In vitro construction of Lacz gene fusions with the nifhdk operon of azospirillum brasilense.- Isolation and characterization of Azospirillum Brasilense mutants altered in the production of siderophores.- Taxonomic relationships between [Pseudomonas] Rubrisubalbicans, some clinical isolates (EF group 1), Herbaspirillum Seropedicae and [Aquaspirillum] Autotrophicum.- Study on the binding of azospirillum strains to plant tissues.- Effect of Azospirillum lipoferum and GA3 on root growth in corn.- Interactions of VA-mycorrhizae with Acetobacter diazotrophicus inoculated into sweet potatoes (Ipomoea batatas L. Lam.).- Genetic and biochemical studies on the production of indole-3-acetic acid (IAA) in azospirillum lipoferum.- Autoregulation of pH by Azospirillum spp..- Nitrogen fixing bacteria isolated from maize root and antagonistic activity against Fusarium sp.- Some characters of Azospirillum spp. isolated from the rice fields near Hanoi, Vietnam.- Melanin production by Azospirillum Lipoferum strains.- Effect of pO2, pCO2 and agitation on growth kinetics of Azospirillum lipoferum under fermentor conditions.- Selection of wetland rice genotypes for associated biological nitrogen fixation.- Enrichment of tomato sand cultures with composite inocula of associative dinitrogen fixers, p-dissolving bacilli and vam..- Partial purification and properties of two aromatic amino acid aminotransferases from the A. brasilense UAP 14 strain indole-3-acetic acid producer.- Characterization and regulation of two enzymatic activities involved in biosynthesis of indoleacetic acid in Azospirillum Brasilense UAP 14 strain.- Analysis of extracellular polysaccharides of Azospirillum Brasilense.- NO3- and Fe++ uptake in durum wheat is affected by Azospirillum brasilense inoculation.- Efficiency of Azotobacter strains depending of nitrogen level and sugar beet genotypes.- Specific responses of azotobacter strains and sugar beet genotypes.- Associative diazothrops of different systematic groups and their effect on the productivity of agricultural crops.- Construction of a growth chamber for long-termed axenic plant cultivation.- N2 fixing bacteria in the Rhizosphere of natural populations of Italian Ryegrass (Lolium multiforum L.).- Studies on few strains of azospirilla colonizing maize rhizosphere: their establishment on roots and effects on plant physiology.- Root-associated diazotrophs used as plant growth stimulators.- Screening program for the isolation of N2-fixing bacteria of the genus azospirillum.- Interactions between azospirillum and sorghum rhizosphere isolates under different cultural condiitons.- Competition in sorghum rhizosphere among Azospirillum and indigenous bacteria.- Nitrogenase activity in the tobacco rhizosphere.- Effect of different pesticides on Azospirillum Brasilense.- Experiments of Azospirillum bacterization of maize seeds (zea mais L,) in open field.- Nitrogen fixation in filamentous cyanobacteria..- Recent aspects on the hydrogenase-nitrogenase relationship in cyanobacteria.- Azolla and other plant-cyanobacteria symbioses: aspects of form and function.- Structure, metabolism and nitrogenase regulation in the Azolla-Anabaena association.- Regulation of nitrogen assimilation in the cyanobacterium Synechococcus.- Calcium, dinitrogen fixation and calmodulin in a Nostoc.- Respiratory protection of the nitrogenase in dinitrogen-fixing cyanobacteria.- Photosynthetic oxygen evolution in the filamentous cyanobacterium Oscillatoria chalybea: interrelationship between water splitting, hydrogen peroxide decomposition and nitrate metabolism.- Photosynthesis and respiration in mixotrophic cultures of the cyanobacterium Anabaena variabilis.- A possible role of flavodoxin in nitrogen fixation in heterocysts from Anabaena.- Photosynthesis and nitrogen fixation in the unicellular cyanobacterium Gloeothece PCC 6909.- Diurnal and seasonal variation of nitrogen fixation and photosynthesis in cyanobacterial mats.- Superoxide dismutase detection in Anabaena azollae strasb. isolated from Azolla filiculoides LAM.- Are bacteria the third partner of the Azolla-Anabaena symbiosis?.- Effects of antibiotic treatments on Azolla-Anabaena and Arthrobacter.- The Anabaena-Azolla symbiosis: diversity and relatedness of neotrophic host taxa.- Assessment and attempt to explain the high performances of Azolla in subdesertic trophics versus humid tropics.- Constraints for the widespread use of Azolla in rice production.- Heterotrophic metabolism and regulation of uptake hydrogenase activity in symbiotic cyanobacteria.- Nitrogen fixing cyanobacteria potential uses.- Metabolic regulation of nitrogen fixation in anoxygenic phototrophic bacteria.- Organization of the genes encoding uptake hydrogenase in the photosynthetic bacterium Rhodobacter capsulatus.- Diazotrophic mixed culture of Azotobacter vinelandii and Rhodobacter capsulatus.- Structural and genetic studies on four ferredoxins from the photosynthetic bacterium Rhodobacter capsulatus: probable involvement in nitrogen fixation.- Growth and amino acid liberation by a mutant strain of Anabaena variabilis resistant to the amino acid analogue azetidine 2-carboxylic acid.- Interaction B-Ca on the nitrogenase activity in nitrogen-fixing cyanobacteria (Anabaena PCC 7119).- The effect of ammonia-excreting cyanobacteria on the growth of rice.- Photoautotrophic and photoheterotrophic N2 fixation in Oscillatoria spp exposed to alternating light and darkness.- Occurrence and localization of an uptake hydrogenase in the filamentous heterocystous cyanobacterium nostoc PCC 73102.- The effect of phytohormones on nitrogenase activity and growth of nostoc muscorum agardh.- Effect of ammonium on the nitrogenase activity of Anabaena variabilis.- Modification and in-vitro activation of dinitrogenase reductase from anabaena variabilis.- Nitrogen fixation in Spanish ricefields.- Production of dinitrogen-fixing cyanobacteria for soil inoculation.- Productivity of the marine nitrogen fixing cyanobacterium nodularia sp. in outdoor culture.- Studies on rice production using Azolla as biofertilizer in Guinea-Bissau.- The roles of Anabaena Azollae in Anabaena-Azolla association.- Field studies using 15N dilution techniques on Azolla N contribution to rice in Nigeria.- Localization of nitrogen in the Azolla-Anabaena symbiosis by eftem.- The pattern of release of azolla-nitrogen in flooded and unflooded soils at three temperatures.- Factors controlling morphological changes and the life cycle of nitrogen-fixing cyanobionts in different Azolla species.- Fatty acid composition of free-living anabaena and nostoc cyanobacteria and of cyanobionts from different azolla species.- Dinitrogen fixation (ara) in Lobaria Pulmonaria.- Biological nitrogen fixation in arcticsoil and vegetation determined by the acetylene reduction methode.- The Nostoc-Gunnera Magellanica symbiosis: developmental patterns related to nitrogen fixation.- Morphological and physiological characterization of N2-fixing symbiotic cyanobacteria.- Genetic organization of Rhodobacter sphaeroides chromosome region containing gene GLNA.- Factors involved in selection of Nif-mutants in N-limited cultures of the photosyn-thetic bacterium Rhodobacter capsulatus.- Genetic characterization of the gene encoding ferredoxin II from the nitrogen fixing phototrophic bacterium rhodobacter capsulatus.- DNA sequence of a new ferredoxin gene mapping in a nif Region of Rhodobacter capsulatus, and expression in Escherichia coli.- Analysis of DNA restriction pattern in the genus ectothiorhodospira.- Effect of Mo, V and W on the growth and nitrogenase synthesis in phototrophic bacteria.- Nitrogen metabolism in Rhodobacter capsulatus.- Purification of a pyruvate: oxidoreductase from nitrogen fixing Rhodospirillum rubrum.- Derepression of nitrogenase by 2-ketoglutarate in a glutamate auxotroph of Rhodobacter sphaeroides.- Outdoor Hydrogen Photoevolution by immobilized cells of Rhodopseudomonas palustris.- Azolla Biomass as green manure for rice in calabria.- Molecular ecology of Frankia: advantages and disadvantages of the use of DNA probes.- Expression of actinorhizins in the development of the Frankia-Alnus symbiosis.- Rapid exponential growth and increased biomass yield for some Frankia strains in buffered and stirred mineral medium (BAP) added of phosphatidyl choline.- Enhancing nodulation and growth of Casuarina glauca planted in substrate already infected with Frankia.- Structure of the genus Frankia.- Grouping of Frankia strains by DNA-DNA homology: how many genospecies are in thegenus Frankia?.- Genetic diversity of elaeagnus-isolated Frankia strains infective on both alnus and elaeagnus.- The infectivity and symbiotic performance of a Frankia strain as affected by its growth medium towards Hippophae rhamnoides L..- Utilisation and metabolism of C1 compounds by Frankia.- Nitrogenase activity and nitrogenase protein levels in a Frankia-Alnus incana symbiosis subjected to darkness.- Secretion of aminopeptidases and proteinases by Frankia sp BR..- Interaction between VAM and actimorhizal symbionts in Alnus nepalensis.- Comparison between Quercus Robur/Alnus Cordata mixed plantation and Quercus Robur in monoculture.- EEC regulatory requirements for the use and release of genetically modified organisms.- Studies of the potential for expression of nitrogenase Fe-protein in cells of higher plants.

'...but I recommend this book to anyone who wants to taste the excitement of a fascinating, if occasionally fanatical. ' Society for General Microbiology Quarterly nov. 1992 ' The book provides a valuable reference source not only for specialists in nitrogen fixation, but also for researchers working on related aspects of agronomy, biochemistry, genetics, microbiology, molecular biology and plant physiology. ' Agrochimica 36:3 1992