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  • 1
    Electronic Resource
    Electronic Resource
    Influence of gibberellic acid on the sporulation of Azolla caroliniana, Azolla microphylla and Azolla pinnata (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 424-429 
    Details
    ISSN: 1432-0789
    Keywords: Key words Azolla species ; Gibberellic acid ; Megasporocarp percentage ; Sporocarp number ; Sporulation frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Azolla microphylla strains used in the study sporulate throughout the year while Azolla caroliniana and Azolla pinnata strains show sporulation only during November–March, the favourable period for sporulation. Application of gibberellic acid (GA) at a concentration of 2.5–100.0 μg ml–1 substantially enhanced the sporulation frequency and number of sporocarps (mega plus micro) per plant in Azolla microphylla (two strains) during the unfavourable period (September–October) by 77.3–200.0%. The increase in the number of microsporocarps was more than that of the megasporocarps. The sporulation frequency and number of sporocarps in Azolla pinnata (two strains) and Azolla caroliniana during the favourable season also increased considerably due to GA (2.5–10.0 μg ml–1) application. The optimum GA concentration for the sporulation of the three Azolla species was 2.5 μg ml–1, which was used in the subsequent investigations. Efficacy of GA for enhancing sporulation was tested across 20 Azolla pinnata strains. A significant positive response was observed in all the strains. Of them, 17 strains for the sporulation frequency and 15 strains for the sporocarp number showed a 〉25% increase due to GA treatment. Under field conditions, Azolla microphylla (two strains), Azolla caroliniana and Azolla pinnata exhibited 66.0–88.1% higher sporulation frequency and 42.8–52.6% higher sporocarp number due to GA application. However, the proportion of megasporocarps to total sporocarps did not change.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050575
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  • 2
    Electronic Resource
    Electronic Resource
    A theoretical verification of intensity of plasmaspheric ELF hiss emissions: theory versus GEOS-1 observations (1997)
    Springer
    Annales geophysicae 15 (1997), S. 597-602 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An attempt is made to confirm the generation mechanism of plasmaspheric ELF hiss emissions observed aboard GEOS-1 satellite in the equatorial region both at small and large wave normal angles by calculating their magnetic field intensities in terms of incoherent Cerenkov radiation mechanism and cyclotron resonance instability mechanism, using appropriate and suitable plasma parameters. The ELF intensities calculated by Cerenkov radiation mechanism, being 4 to 5 orders of magnitude lower than the observed intensities, rule out the possibility of their generation by this mechanism. On the other hand, the intensities calculated under electron cyclotron resonance instability mechanism are found to be large enough to account for both the observed intensity and propagation losses and hence to confirm that plasmaspheric ELF hiss emissions observed aboard GEOS-1 satellite both at small and large wave normal angles were originally generated in the equatorial region by this mechanism just near the inner edge of the plasmapause. The difference in the observed intensities of two types of the emissions has been attributed to the propagation effect rather than the generation efffect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0597-x
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  • 3
    Electronic Resource
    Electronic Resource
    Day time observations of precursors at low latitude (1996)
    Springer
    Earth, moon and planets 73 (1996), S. 267-275 
    Details
    ISSN: 1573-0794
    Keywords: Earth atmosphere ; ionosphere ; whistlers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Whistler precursors observed during day time at low latitude ground station Gulmarg (Geomag. Lat. 24
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115885
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  • 4
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to podfly and podborer in the interspecific cross of pigeonpea (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 506-508 
    Details
    ISSN: 1432-2242
    Keywords: Key words Cajanus cajan ; C. scarabaeoides ; Podfly ; Podborer ; Interspecific cross
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Pigeonpea, Cajanus cajan, is an important grain legume of Asia and Africa. The podfly, Melanagromyza obtusa, and the podborer, Helicoverpa armigera, are the major insect pests of this crop. An accession (JM 4147) of the wild species Cajanus scarabaeoides appears to possess resistance to these insect pests. For investigating the inheritance of resistance a cross was made between the susceptible cultivar Pant A-3 as female and the wild species. The parental lines and their F1, F2 and backcross generations were studied. For podfly, the per cent pod damage was recorded on individual plants. The results suggested that resistance to podfly is governed by the two recessive genes. In the podborer screening for antixenosis was carried out through the dual-choice arena test. The results indicated that a single dominant gene is involved in the antixenosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050590
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  • 5
    Electronic Resource
    Electronic Resource
    Inheritance of spontaneous male sterility in peas (1995)
    Springer
    Theoretical and applied genetics 90 (1995), S. 63-64 
    Details
    ISSN: 1432-2242
    Keywords: Peas ; Pisum sativum ; Male sterility ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A plant with a mutant phenotype was observed in a ‘Longittee’ cultivar. The plant was late in maturity, had white-translucent anthers, and was male sterile. The inheritance of this mutant was studied in a cross involving the mutant and the mother parent and their F1, F2, F3 and BC1F1 generations. The results suggested that the sterile character was genetic and due to a recessive gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220996
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  • 6
    Electronic Resource
    Electronic Resource
    Inheritance of spontaneous male sterility in pigeonpea (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 1102-1103 
    Details
    ISSN: 1432-2242
    Keywords: Key words Pigeonpea ; Cajanus cajan ; Male sterility ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A male-sterile plant was observed in the UPAS-120 cultivar of pigeonpea (Cajanus cajan). The plant was about 5–7 days late-flowering and had white translucent anthers with complete pollen sterility. The inheritance of this spontaneous male sterility was studied in a cross involving the mutant and fertile UPAS-120, including their F1, F2, BC1F1 and BC2F1 generations. The results suggested that the male sterility was genetic and due to a recessive gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050522
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  • 7
    Electronic Resource
    Electronic Resource
    Controlled blasting in an open-pit mine for improved slope stability (1995)
    Springer
    Geotechnical and geological engineering 13 (1995), S. 51-57 
    Details
    ISSN: 1573-1529
    Keywords: Blasting ; slope ; open-pit ; mine presplitting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary A case study is presented where a controlled blasting programme (presplitting) was adopted in an open-pit copper mine in order to improve the stability of the resulting cut slopes. The aim was to reduce over break and minimize damage to the final pit walls from production blasts. The use of presplitting allowed considerably higher benches to be adopted with much steeper overall slope angles. The extra cost of presplitting was fully justified by the improved face stability and the resulting reduction in overburden quantity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600523
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  • 8
    Electronic Resource
    Electronic Resource
    Differential regulation of high light tolerance in the mutant and wild-type Anacystis cells (1995)
    Springer
    Current microbiology 30 (1995), S. 373-379 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A high light-tolerant mutant of the unicellular cyanobacterium, Anacystis nidulans, was able to tolerate about threefold higher light intensity (30 W/m2) when compared with the wild type (10 W/m2). The results on the Hill activity and whole chain electron transport in both the mutant and wild-type cells exhibited an opposite response to an increase in the light intensity beyond the normal light condition (10 W/m2). Photoinactivation of the electron transport process occurred in both the strains beyond their respective photosynthesis-saturating light intensities. However, mutant cells were able to retain efficiently high photosystem II (PS II) activity (Hill activity) as compared with the wild-type cells. In the wild-type cells, both the oxidizing and reducing sides of the photosynthetic electron transport chain were found to be damaged by the high fluence rate, unlike the mutant cells in which only the oxidizing side of PS II was inactivated. With the help of exogenous electron donors hydroxylamine (NH2OH) and diphenyl carbazide (DPC) photoinactivated sites on the electron transfer chain were delineated. Further, the mutant cells showed active repair of the photoinactivated sites within 48 h after imposition of the normal conditions, whereas in the case of the wild-type cells placed under the same condition, only the oxidizing side was repaired. The active repair process of the damaged sites for photosynthesis was again confirmed by the use of inhibitors of protein synthesis such as chloramphenicol, rifampicin, and l-methionine, dlsulfoximine (MSX), a glutamine synthetase (GS) inhibitor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369865
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  • 9
    Electronic Resource
    Electronic Resource
    Photooxidative damage to the cyanobacterium Spirulina platensis mediated by singlet oxygen (1995)
    Springer
    Current microbiology 31 (1995), S. 44-48 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Experiments on the specific growth rate, bleaching of pigments, O2 evolution, lipid peroxidation, and loss of sulfhydryl (-SH) content in response to the varying light intensities (2–28 W/m2) suggested that photodamage to the Spirulina cells was maximum at or beyond the photosynthesis saturating light intensity (12 W/m2). However, photobleaching of the chlorophyll a was relatively higher than β carotenoid. The results on the N,N-dimethyl-p-nitrosoaniline (RNO) bleaching in the presence of oxygen radical quenchers exhibited maximum effect of sodium azide and indicated about the generation of singlet oxygen. The chlorophyll a-sensitized production of singlet oxygen by a type II reaction cannot be ruled out because of maximum oxidative damage to the cells at or beyond the photosynthesis saturating light intensity, i.e., 12 W/m2, when the availability of triplet chlorophyll is maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294633
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