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  • 1995-1999
  • 1970-1974  (3)
  • 1971  (3)
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  • 1995-1999
  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Genetic divergence among rice strains (1971)
    Springer
    Theoretical and applied genetics 41 (1971), S. 31-35 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary For screening better types among 10 strains with the help of the D 2 statistic, an experiment was conducted in randomized block design with three replications. 10 plants in each plot were randomly selected and observations were recorded on final plant height, heading duration, effective tillers, number of grains per panicle, yield per plant and 100 grain weight. The observations were analyzed and found to be significant at 1% level. In the study of distance relations the contribution of grain number per panicle to D 2 values was found to be maximum. Again, this technique also helped in grouping the 10 strains into four clusters, viz. A, B, C and D, of which B possessed six strains out of 10; A possessed two and C and D one each. Group A comprised 2 selections from the same cross. Group D was composed of a selection from a cross involving Dular and Taichung Native-1 as parents. Group B possessed Dular, two selections from a cross involving Dular as one of the parents, Dharial and N.C.-1626. The constituents of A are expected to be transgressive segregates. Group A was maximally distantly related with D followed in order by C and B. The distance between B and C was small. Group D was found to be the best of all strains studied, followed by B, C and A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279296
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of viable F1 seeds of some interspecific crosses by X-ray photography (1971)
    Springer
    Euphytica 20 (1971), S. 430-434 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Some of the hybrid seeds obtained by interspecific crosses show lack of proper development of seed parts like embryo or endosperm. If such seeds are sown, no plant is usually obtained. However, if the internal details of the seeds are known prior to sowing, embryo culture method may be resorted to for the under-developed seeds and the unfortunate loss of hybrid plants may probably be avoided. The use of X-ray photography was found to be very promising and was employed to assess the internal condition of the hybrid seeds obtained from the interspecific crossing programme, viz, 1. Oryza sativa × O. officinalis, 2. Abelmoschus esculentus × A. moschatus, 3. Lycopersicum esculentum × L. pimpinellifolium and 4. Solanum melongena × S. testiculatum. The special advantages of this technique are, that a. it is possible to know the internal development of F1 seeds without causing any damage to them; b. knowing the condition of the seed, adequate care could be provided to individual seeds as judged by the radiographs; c. it is a very quick and sure method which could be used by the geneticists and breeders in their distant crossing programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035670
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Studies on sulfur vulcanization of natural rubber accelerated with diphenylguanidine both in presence and absence of dicumyl peroxide (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 1341-1355 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Diphenylguanidine acceleration of sulfuration of natural rubber both in the presence and absence of dicumyl peroxide (DCP) has been studied. DPG enhances the rate of decomposition of DCP, and the crosslinking maxima due to DCP are lowered by DPG to some extent, which increases with the concentration up to a limiting value. The rate of sulfur decrease is very high and is dependent on DPG concentration but practically independent of the presence of ZnO and stearic acid. It is observed that with constant level of DCP and sulfur, crosslinking increases with the increase of DPG concentration and finally becomes additive when the molar proportion of DPG: S8 approximately equals 1:1. In presence of ZnO and stearic acid, with each increment of DCP concentration crosslinking is retarded for both systems. Mechanisms have been suggested in terms of polar and radical process.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070150605
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    Paper (German National Licenses)
    Fulltext
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