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  • Selection index  (2)
  • 72.80.Ng  (1)
  • Genetic classification  (1)
  • 1
    ISSN: 1432-0630
    Keywords: 81.15.Cd ; 72.80.-r ; 72.80.Ng
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon nitride films have been deposited by the rf magnetron sputtering method with non-stoichiometric and stoichiometric compositions using a poly-Si target and a mixture of Ar, H2 and N2 as the sputtering gas. Data on optical and infrared absorption, electrical conductivity, breakdown voltage, capacitance measurements and thermal evolution of hydrogen have been presented as a function of nitrogen concentration in the films, especially in the stoichiometric region of composition. Attempts have been made to identify the roles of hydrogen and nitrogen in determining the electrical and optical properties and thermal stability exhibited by the films. Properties relevant for device application of the material have been shown to be comparable to those obtained by glow discharge or electron cyclotron resonance plasma chemical vapour deposition methods of deposition. RF magnetron sputtering has therefore been suggested as a viable alternative to the more widely adopted CVD methods for device applications of silicon nitride, where the use of hazardous process gases can be avoided.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 80 (1990), S. 223-227 
    ISSN: 1432-2242
    Keywords: Selection index ; Nitrogen fixation ; Peanut ; Nonparametric method ; Stepwise regression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Eight characters related to nitrogen fixation and pod development measured 30 days after flowering were evaluated for their correct grading of the relative yield performance of 17 genetically diverse lines of groundnut (Arachis hypogaea L.). Each line was assigned a high or low yield status based on its pod yield, shelling percentage, and 100-kernel weight. Seventeen character combinations were examined for their relative merit in correct identification of the yield status of lines. The character sets, nitrogenase activity alone or in combination with nitrogen percent or shoot weight identified the status of 77% of lines correctly. The extent to which various characters accounted for the variation in pod yield was also checked by multiple regression analysis. While the character combination, nitrogen percent plus leaf area explained 75% of variation in pod yield, nodule mass, nitrogenase activity, and leaf area occurred in some other combinations that explained yield variation to a lesser extent. These analyses point to the profitability of involving crop physiological traits such as leaf area and nitrogen percent in selecting for relative yield performance in groundnut.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 71 (1985), S. 300-304 
    ISSN: 1432-2242
    Keywords: Selection ; Selection index ; Selection intensity ; Early generation ; Arachis hypogaea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The F2 potential of single and three-way crosses was evaluated using a set of physiological and yield components. Results were based on an index of selection using (a) only yield components and (b) both physiological and yield components. The indices were constructed using the percentage improvement of F2 over the better parent of the corresponding F1 cross for every character. The performance of F2 plants assessed by the expected value of the regression index was ranked in descending order to provide a ranked F2 distribution (FRD). The FRD was divided into four equal parts, T25 (top 25%), T50 (26–50%), T75 (51–75%) and T100 (76–100%). F3 families derived from F2 plants in T25 were found to provide a higher frequency of selections for pod number than T50, T75 and T100. The frequency of selections was higher in three-way than single crosses. Selection index based on physiological and yield components was more efficient in trapping F2 plants providing selections in F3 than the index based on yield components only. The results brought out the importance of bunch x bunch crosses as a complement to the usually advocated bunch x runner ones.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2242
    Keywords: Multiple cross ; Combining ability ; Brassica-campestris ; Heterosis ; Multiple pollen ; Oilseed breeding ; Genetic classification ; Mucromphs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A set of 167 ‘mucromphs’ was evaluated in their F1 generation for seven ‘plant’, four ‘plot’ and five ‘ratio’ characters. Methods of characterizing the parents and the hybrids on the basis of combining ability effects described in the first part were found to be efficient in identifying desirable cross combinations for pedigree breeding or generating composite populations. Order effects of multiple-pollen combinations were found to be potent for a number of character components. High x Low cross-combinations were found to produce a high frequency of heterotic crosses followed by High x High. Selected biparental progenies, single crosses, three-way crosses and elite varieties were successful female parents and combinations of pollen from two varieties, one variety and three varieties were successful male parents, in that order, in producing significant heterosis in mucromphs. The relationship between general and specific combining ability on the one hand and realised heterosis on the other was discussed.
    Type of Medium: Electronic Resource
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