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  • 1
    Electronic Resource
    Electronic Resource
    ISO Observations of Classical Novae (1997)
    Springer
    Astrophysics and space science 255 (1997), S. 227-235 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe the ISO programme to observe classical novae. The programme includes observations of novae during and shortly after eruption, and old novae. ISO observations of far infrared fine structure lines are providing us with information about physical conditions in nova ejecta which complement and extend knowledge obtained from ground-based observations. Surprisingly, we are getting little information about dust in nova systems, despite the fact that many novae are prolific dust-producers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001150716412
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  • 2
    Electronic Resource
    Electronic Resource
    ISO Observations of Symbiotic Stars (1997)
    Springer
    Astrophysics and space science 255 (1997), S. 361-366 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A number of symbiotic stars have been observed with ISO. In addition to a number of emission lines, SWS observations of the symbiotic novae RR Tel and V1016 Cyg reveal prominent, broad 10 & 18 µm silicate dust features. The 10 µm features are similar to the crystalline silicate profiles seen in classical novae. There is some evidence that the silicate brightness in V1016 Cyg varies with Mira-component phase. However, the silicate feature in RR Tel also showed some variation even though observations were made at very similar Mira-component phases. PHT observations of S-type symbiotic stars show the IR emission to be dominated by the red-giant component. However, an excess in the PHT-P filters from 10 to 15 µm is evident in all the stars, and there may be a broad 3.2 µm absorption feature or a broad 3.8 µm emission feature. At this time we have no adequate physical explanations for any of these features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001508412295
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  • 3
    Electronic Resource
    Electronic Resource
    The Moon and Extra-Solar Planets (1999)
    Springer
    Earth, moon and planets 85-86 (1999), S. 201-207 
    Details
    ISSN: 1573-0794
    Keywords: Infrared: Stars–Moon ; Stars: Planetary systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have used ISO, the Infrared Space Observatory, to perform a systematic search for protoplanetary discs around nearby main-sequence stars. We find a strong correlation with stellar age: more than half of the stars younger than 400Myr do have such a disc, whereas less than 10% of the older stars exhibit disc emission. Such discs seem thus to decay on a timescale of a few hundred Myr. Both the stability of the discs during this period and their decay can be explained by collisions of planetesimals. Such collisions produce the dust which is necessary to replenish the disc. The process stops as soon as the planetesimals run out, either because they are all destroyed, have escaped, or merged into planets, which implies the decay of the disc. The timescale for the dissipation of protoplanetary discs is remarkably similar to the timescale of the heavy bombardment in our Solar System. The cratering of the Moon is a clear signature of the heavy bombardment which may provide further fundamental clues to the formation of planetary systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017067915613
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of dihydrostreptomycin on the growth and carbohydrate metabolism of mycelial mats of rhizoctonia solani (1961)
    Springer
    Archives of microbiology 38 (1961), S. 283-288 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dihydrostreptomycin failed to induce any appreciable inhibitory action on the growth of mycelial mats of Rhizoctonia solani. On the contrary, the two concentrations 100 and 1000 p.p.m. enhanced growth during the experimental period. The failure of dihydrostreptomycin sulphate to induce inhibitory effects on the growth of mycelial mats of the test fungus may be due to the ability of the fungal cells to degrade the antibiotic and use it as sources of carbon and nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422360
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of colchicine on the carbohydrate metabolism of mycelial felts of cunninghamella Sp. (1963)
    Springer
    Archives of microbiology 46 (1963), S. 296-304 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An experiment is reported in which 5 days old Cunninghamella spec. mats were incubated at 25°C over Richard's medium alone or together with colchicine. The results show that, up to 20 p.p.m., colchicine had no effect on dry weight and soluble sugar content of the fungal mats but caused an acceleration in the rate of sugar absorption and utilisation and polysaccharide accumulation especially the glucosans. 10 p.p.m. concentration further induced an increase in CO2 production and synthesis of mononucleotides and nucleoproteins as indicated by excessive accumulation of conjugated pentoses and the pentosan fraction of polysaccharides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422190
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  • 6
    Electronic Resource
    Electronic Resource
    Colchicine after-effects on the absorption and utilisation of sucrose by Cunninghamella sp. (1964)
    Springer
    Archives of microbiology 48 (1964), S. 185-202 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Colchicine had no significant effects on the rate of growth of Cunninghamella when administered in 5 p.p.m. concentration; at 10 p.p.m., it induced a slight increase, while at higher concentrations it lowered the dry weight. Pretreatment with colchicine, during the fungal growth induced a persistant activation of hexose phosphorylases, particularly fructose phosphorylase; more promenantly by the continuous supply of the drug than during the recovery on Richard's medium; a phenomenon that might be partially or wholly alleviated by transfer of the treated mats to Richard's solution alone. In all cases the CO2 output of the treated samples was unaffected by the drug except at higher levels (20 p.p.m.). Colchicine treatment favoured the accumulation of polysaccharides; the rate of accumulation depended entirely on both the dose and duration of administration. Furthermore, lower concentrations of the drug favoured nucleoprotein formation but had no effect on nucleotides while the higher concentrations reduced both fractions: a phenomenon that persisted whether the tissues were continuously fed with the drug or recovering on nutrient solution alone. The changes in the metabolic pathways of the absorbed sugars have been thoroughly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408458
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  • 7
    Electronic Resource
    Electronic Resource
    Colchicine after-effects on the absorption and utilisation of phosphates and nitrates by mycelial felts of Cunninghamella sp. (1964)
    Springer
    Archives of microbiology 48 (1964), S. 222-238 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Colchicine at 5 and 10 p.p.m. increased both phosphorus uptake and incorporation into organic forms (nucleoproteins or other simpler organophosphorus compounds). Continuous supply of colchicine at 20 p.p.m., almost checked phosphorus uptake during the second 24 hours of the experiment. The absorbed nitrates were utilised through the classical reduction steps. It appears also that colchicine had an inhibitory effect on the nitrite reductase that increased by increasing the concentration of the drug. Continuous supply of colchicine at its highest concentration (20 p.p.m.) checked completely the protein building during the second 24 hours of the experiment, though nitrate absorption continued; a phenomenon that caused the accumulation, in the tissue medium systems, of large amounts of peptide nitrogen. The mechanism of nitrate reduction as affected by colchicine treatment was fully discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408593
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  • 8
    Electronic Resource
    Electronic Resource
    On the mechanism of sucrose utilisation by mycelial felts of Rhizoctonia solani (1961)
    Springer
    Archives of microbiology 38 (1961), S. 289-298 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The results of the present investigation proved that sucrose is utilised by mycelial mats of Rhizoctonia solani through a process of hydrolytic cleavage into glucose and fructose affected by an enzyme of the fructofuranosidase type attached to the cytoplasmic surfaces and not through the mediation of a specific sucrose phosphorylase enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408005
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  • 9
    Electronic Resource
    Electronic Resource
    On the mechanism of sucrose utilisation by mycelial felts of Rhizoctonia solani (1960)
    Springer
    Archives of microbiology 36 (1960), S. 23-30 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The utilisation of sucrose and its constituent monosaccharides, as well as of maltose and raffinose by mycelial felts of Rhizoctonia solani was studied with a view to throwing some light on the mechanism of utilisation of sucrose by the fungal mats being tested. The results obtained suggest that sucrose is, most probably, utilised through a process of hydrolysis by a β-heterofructosidase enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405939
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on the mechanism of action of sulfanilamide on mycelial felts of Rhizoctonia solani (1962)
    Springer
    Archives of microbiology 43 (1962), S. 336-348 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sulfanilamide induced strong inhibitory effects on the growth, respiration and carbohydrate synthesis by mycelial felts of Rhizoctonia solani. The possible reasons for such inhibitory effects are discussed. The inhibitory effects of sulfanilamide were almost completely alleviated by the inclusion of p-aminobenzoic (PABA) acid in the culture medium of the fungal mats. R. solani normally produces certain amounts of PABA and its growth and metabolism is inhibited in presence of excess of it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408677
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