R. Abdel-Basset

Assiut University · Botany and Microbiology Department

Spirulina platensis SAG obtained from (Sammlung von Algen culturing Gottingen), Calothrix parteniana and Oscillatoria sp. (isolated from Egyptian soil sample) were cultivated in BG11 medium either in the presence of nitrogen and sulphur (control culture condition) or without addition of nitrogen (N0) or sulphur (S0) and combined nitrogen and sulphu...

Batch cultures of Spirulina platensis were conducted to assess the effect of N, P, Mn, and Fe deficiency on the growth, some metabolic activities especially the production of total antioxidants, Vitamin A, E, reducing power, and phenolics compound. The growth of S.platensis expressed as chl.a content and dry weight were reduced under all tested ele...

The studied bacterial strains grew and evolved hydrogen utilizing orange peel as the sole carbon and nitrogen source, as much as their respective controls grown in RÄH media only. Noticeably, orange peel inhibited the uptake hydrogenase (Hup) activity and simultaneously enhanced the cumulative hydrogen evolution levels. The cumulative hydrogen was...

In this study examined the filamentous cyanobacterium Nostoc sp PCC 7120 (wild type containing one nitrogenase, one uptake hydrogenase and one bidirectional hydrogenase), its hydrogen uptake deficient mutant Hup- 7120 and also Nostoc sp strain ATCC 29133 (strain lacking bidirectional hydrogenase) for their H2 production capacities under nitrogen an...

Biological control of Fusarium salani (Mart) Sacc. and Macrophomina phaseolina (Tassi) Goid causing wilt and charcoal rot diseases of Sesame (Sesamum indicum Linn) was studied in vitro as well as under pot conditions. Culture technique showed that the addition of intact Nostoc sp SAG2306 or its sonicate inhibited the radial mycelial growth of the t...

A Nostoc-like cyanobacterium, strain SAG 2306, was isolated from a clay soil sample at Assiut region (Egypt). Morphology and analysis of 16S rDNA identified it as a member of the heterocyteous cyanobacteria (Nostocales). Unexpectedly, chlorophyll a and dry weight were higher in manganese deprived (Mn-) or in manganese double deprived (Mn--) than in...

Heterocysts are microaerobic specialized nitrogen fixing cells formed in some filamentous cyanobacteria and having the structural and physiological capacity to create and install internal anaerobic environment. The findings presented herein suggest that the auxin herbicide 2,4-D (2,4-dichlorophenoxyacetic acid) might be used for decreasing the cult...

Heterocysts are microaerobic specialized nitrogen fixing cells formed in some filamentous cyanobacteria and having the structural and physiological capacity to create and install internal anaerobic environment. The findings presented herein suggest that the auxin herbicide 2,4-D (2,4-dichlorophenoxyacetic acid) might be used for decreasing the cult...

Nostoc rivulare was grown in batch cultures under controlled CO2 and NO3 – concentrations to modulate the photosynthetic source:sink relationship. Increasing CO2 supply accelerated the accumulation of chlorophyll (Chl) a, i.e., supplemental CO2 combined with double concentrations of NO3 – more than doubled the amounts of Chl a relative to those of...

Efficient de novo shoot organogenesis from hypocotyl and cotyledons was studied under NaCl-salinity conditions and in a salinity-calcium combination. Sodium chloride inhibited shoot regeneration markedly at 100 and 150 mM NaCl. Both the fresh and dry weight were also reduced. The mineral contents (Na, K and Ca) of hypocotyl and cotyledonary culture...

Scenedesmus obliquus was incubated with Cd2+ in the presence or absence of calcium at low (10°C) or high (40°C) temperature. The Cd2+ uptake was affected not only by Ca2+ but also by temperature. Growth rate was inhibited by Cd2+ especially at low temperature. In all Ca2+-containing cultures,S. obliquus exhibited higher rates of growth, dry matter...

Vicia faba plants were grown under drought conditions and variously supplemented with calcium. Drought stress markedly inhibited the growth of Vicia faba plants. Ca2+ ameliorated to a large extent this inhibition; fresh weight, dry mass, chlorophyll and water contents were variably improved. Membranes were, also, negatively affected by drought stre...

The green alga Kirchneriella lunaris was incubated with various heavy metals (Cd2+, Co2+, Mn2+, Ni2+) in presence/absence of calcium (Ca2+). The uptake of heavy metal was affected by Ca2+. Growth rate was inhibited by all heavy metals applied. In all Ca2+-containing cultures Kirchneriella exhibited higher rates of growth than those containing heavy...