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  • 1
    Electronic Resource
    Electronic Resource
    Electron transport mobility in a δ-doped double quantum well structure (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2658-2664 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron transport mobility μn in a GaAs/AlxGa1−xAs coupled double quantum well structure has been studied. The central barrier is delta-doped with Si so that we have two sheets of two dimensional electron gas separated by a positively charged donor layer. The subband electron wave functions and the energy levels are numerically obtained as a function of barrier height, barrier width, well width, and doping concentration. The screened ionized impurity potential is obtained in terms of the static dielectric response function within the random phase approximation. The effect of tunneling of electrons through the barrier, screening of ionized impurities, and intersubband scattering on μn of the double channel system is investigated. It would be interesting to compare our results for μn with experiment, when available. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286727
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  • 2
    Electronic Resource
    Electronic Resource
    Somaclonal variation in cell suspension culture-derived regenerants of Cymbopogon martinii (Roxb.) Wats var. motia (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 118 (1999), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Plants regenerated from cell suspension cultures of palmarosa grass, Cymbopogon martinii (Roxb.) Wats, were analysed for somaclonal variation in five clonal generations. A wide range of variation in important quantitative traits, e.g. plant yield, height, tiller number, oil content and qualitative changes in essential oil constituents—geraniol, geranyl acetate, geranyl formate and linalool—were observed among the 120 somaclones screened. Eight somaclones were selected on the basis of high herb and oil yield over the donor line and high geraniol content in the oil. Based on performance in the field trials, three superior lines were selected, and maintained for five clonal generations. The superior lines exhibited a reasonable degree of stability in the traits selected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.1999.00383.x
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  • 3
    Electronic Resource
    Electronic Resource
    Break in the Indian summer monsoon (1973)
    Springer
    Pure and applied geophysics 104 (1973), S. 635-647 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The changes in circulation patterns over Eurasia during break monsoon condition over India are studied in comparison to the active monsoon condition. Break monsoon condition seems to set in over the India Sub-Continent in association with eastward movement of middle latitude westerly trough at 500 mb, having large amplitude extending into west Pakistan and northern India. Simultaneously the subtropical anticyclonic ridge over Arabia protrudes into central and Peninsular India. The high latitude blocking high over East Siberia retrogrades and the East Asiatic trough deepens and moves eastwards. The west Pacific subtropical ridge recedes eastward from the China continent. During this period the monsoon trough shifts, from its normal position over Gangetic plains, northwards to the foot of the Himalayas and the monsoon westerlies in the lower troposphere extends right upto the rim of the Tibetan Plateau. The sub-tropical ridge line in the upper troposphere shifts northwards during break and lies approximately above the lower monsoon trough. This seems to provide an effective process of removing ascending air in the lower monsoon trough causing exceptionally heavy rainfall over Assam and along the foot of the Himalayas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875908
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  • 4
    Electronic Resource
    Electronic Resource
    Some aspects of atmospheric static stability parameter of the atmosphere over Africa during the different major seasons (1981)
    Springer
    Meteorology and atmospheric physics 30 (1981), S. 197-209 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Es werden klimatologische Beurteilungen der Werte des Stabilitätsparameters für verschiedene Druckschichten über Afrika in den Monaten Januar, April, Juli und Oktober vorgelegt. Diese Werte zeigen sehr kleine Änderungen in isobaren Schichten. In der Vertikalen ändern sich die Stabilitätswerte sehr rasch, so daß die Werte für die 850–700 mb-Schicht in allen vier Monaten ungefähr um drei Größenordnungen kleiner sind als die für die 50 mb-Schicht.
    Notes: Summary Climatological estimates for the values of static stability parameter are presented for the different pressure layers in the African atmosphere during the months of January, April, July and October. These values show very small variations on isobaric layers. In the vertical, the static stability values change rather rapidly so that the values for the 850–700 mb layer are, in all the four months, about three orders of magnitude less than those for the 50-30 mb layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257843
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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of the tropopause over India (1972)
    Springer
    Pure and applied geophysics 101 (1972), S. 261-275 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A statistical study of the reported height variations of the tropopause over Indian latitudes has been taken up in the present investigation. The analysis show two types of tropopause (1) the tropical tropopause, and (2) the extratropical tropopause. The latitudinal movement of the extratropical tropopause and the height variation of tropical tropopause with seasons are examined. The tropical tropopause near equatorial latitudes shows a lowering of the height during monsoon months (summer months) contrary to the normal expected structure. The characteristics of this equatorial tropopause are examined in relation to meteorological parameters of the troposphere and stratosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876789
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  • 6
    Electronic Resource
    Electronic Resource
    The tropopause over India (1969)
    Springer
    Pure and applied geophysics 75 (1969), S. 355-364 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The frequency of occurrence of the polar and tropical tropopause at different stations in India in different months is studied. The seasonal and latitudinal height variations of the tropical tropopause are examined. A break in the tropical tropopause just at the latitude of the easterly jet stream is suggested. The lower southern tropopause is called the monsoon tropopause. A few comments on the possible characteristics of the monsoon tropopause are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875065
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  • 7
    Electronic Resource
    Electronic Resource
    Micropropagation of Hemidesmus indicus (L.) R. Br. through axillary bud culture (1996)
    Springer
    Plant cell reports 15 (1996), S. 427-430 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT. A procedure for rapid in vitro propagation of the aromatic and medicinal plant Hemidesmus indicus (L.) R.Br. (Family Asclepiadeceae) from nodal explants is described. The highest shoot multiplication rate of 8.2±0.4 shoots/explant with a 95% frequency was achieved in 5 weeks culture period on Murashige and Skoog medium supplemented with 1.15 μM kinetin and 0.054 μM α-naphthaleneacetic acid. Excised shoots were rooted on the same basal medium supplemented with 1.15 μM kinetin and 7.35 μM indole-3-butyric acid. Shoots derived from subcultures exhibited better rooting response than those from primary cultures. After a hardening phase of 2 weeks, there was a 70% transplantation success in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050047
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  • 8
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plantlet regeneration from cell suspension cultures of palmarosa grass (Cymbopogon martinii) (1997)
    Springer
    Plant cell reports 16 (1997), S. 430-434 
    Details
    ISSN: 1432-203X
    Keywords: Key words Cell suspension culture ; Cymbopogon martinii ; Monocot ; Palmarosa ; Plant regeneration ; Somatic embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cell suspension culture was established from nodal callus of Cymbopogon martinii (Roxb.) Wats in a liquid medium containing Murashige and Skoog (1962) basal salts, vitamins, 100 mg l–1 myo-inositol and 20 g l–1 of sucrose (MS) that was supplemented with 13.6 µM 2,4-dichlorophenoxyacetic acid and 1.15 µM kinetin. An initial inoculum density of 2 × 104 cells ml–1 exhibited optimum cell growth. Calli were obtained 12–15 days after the suspension was plated onto semisolid medium of a similar composition. When calli were transferred to semisolid regeneration medium containing MS + 6.7 µM N 6-benzyl-adenine + 1.15 µM kinetin, somatic embryogenesis and plantlet regeneration occurred after 10–25 days. There was no significant decrease in the regeneration potential of the calli even when the cultures were initiated from 47-week-old cell suspensions. Chromosome counts of cells in suspensions, calli and somatic embryos derived from cultures of different ages revealed the presence of diploids, tetraploids and octaploids. However, the 33 regenerated plants tested were all diploid, indicating that only diploid cells were capable of regeneration in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01146788
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  • 9
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plantlet regeneration from cell suspension cultures of palmarosa grass (Cymbopogon martinii) (1997)
    Springer
    Plant cell reports 16 (1997), S. 430-434 
    Details
    ISSN: 1432-203X
    Keywords: Cell suspension culture ; Cymbopogon martinii ; Monocot ; Palmarosa ; Plant regeneration ; Somatic embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cell suspension culture was established from nodal callus ofCymbopogon martinii (Roxb.) Wats in a liquid medium containing Murashige and Skoog (1962) basal salts, vitamins, 100 mg 1−1 myo-inositol and 20 g l−1 of sucrose (MS) that was supplemented with 13.6 μM 2,4-dichlorophenoxyacetic acid and 1.15 μM kinetin. An initial inoculum density of 2 x 104 cells ml−1exhibited optimum cell growth. Calli were obtained 12–15 days after the suspension was plated onto semisolid medium of a similar composition. When calli were transferred to semisolid regeneration medium containing MS + 6.7 μM N 6-benzyl-adenine + 1.15 μM kinetin, somatic embryogenesis and plantlet regeneration occurred after 10–25 days. There was no significant decrease in the regeneration potential of the calli even when the cultures were initiated from 47-week-old cell suspensions. Chromosome counts of cells in suspensions, calli and somatic embryos derived from cultures of different ages revealed the presence of diploids, tetraploids and octaploids. However, the 33 regenerated plants tested were all diploid, indicating that only diploid cells were capable of regeneration in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01146788
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  • 10
    Electronic Resource
    Electronic Resource
    Micropropagation of Hemidesmus indicus (L.) R. Br. through axillary bud culture (1996)
    Springer
    Plant cell reports 15 (1996), S. 427-430 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A procedure for rapid in vitro propagation of the aromatic and medicinal plant Hemidesmus indicus (L.) R.Br. (Family Asclepiadaceae) from nodal explants is described. The highest shoot multiplication rate of 8.2 ± 0.4 shoots/explant with a 95% frequency was achieved in S weeks culture period on Murashige and Skoog medium supplemented with 1.15 μM kinetin and 0.054 μM α-naphthaleneacetic acid. Excised shoots were rooted on the same basal medium supplemented with 1.15 μM kinetin and 7.35 μM indole-3-butyric acid. Shoots derived from subcultures exhibited better rooting response than those from primary cultures. After a hardening phase of 2 weeks, there was a 70% transplantation success in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232069
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