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  • 1
    Electronic Resource
    Electronic Resource
    Lipid biosynthesis in seeds of mustard (Brassica juncea) influenced by zinc and sulphur deficiency (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 80 (1990), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In developing seeds of mustard (Brassica juncea L. cv. RLM 198) the period between 20 and 30 days after fertilization (DAF) was identified as the period of active lipid biosynthesis, although dry matter continued to accumulate until maturity. The period of lipid synthesis was associated with a decrease in starch, soluble sugars and protein, thus, giving rise to precursors for the biosynthesis of lipids. Besides decreasing the dry matter content (on both % and seed basis), Zn and S deficiency caused a significant (P 〉 0.05) reduction in oil content. As compared to control, the decrease in oil content was 11, 12 and 18% at 30 DAF and 4, 9 and 16% at maturity in Zn, S and (Zn+S) deficient treatments, respectively. Throughout the period of seed development, a significant decrease in starch and protein with a slight accumulation of soluble sugars was observed due to deficiency of Zn or S. The rate of [l-14C]-acetate incorporation into total lipids, which was maximal at 30 DAF, also displayed a significant decrease due to the abovementioned mineral deficiencies. Addition of Zn or S in vitro, enhanced the lipid synthesis at all stages of seed development. Under Zn and S deficiency, the phospholipids increased from 10 to 30 DAF and then declined until maturity. However, the proportion of glycolipids and free fatty acids increased, with a corresponding decrease in total glycerides. Further, in deficiency treatments, there was an increase in 22:1 with a corresponding decrease in 18:1, 18:2 and 18:3 in developing and mature mustard seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb04381.x
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  • 2
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    Police and the Media in India (1983)
    New York : Periodicals Archive Online (PAO)
    Police studies. 5:4 (1983:Winter) 33 
    Details
    ISSN: 0141-2949
    Topics: Political Science
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:j612-1983-005-04-000006
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  • 3
    Electronic Resource
    Electronic Resource
    Application of the sum peak method to determine electric field gradient in different environments of133Cs nucleus (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 145 (1990), S. 425-434 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The sum peak method based on the phenomenon of perturbed angular correlation has been applied to study the nuclear quadrupole interaction frequencies at133Cs which is followed by electron-capture decay of133Ba. These values are used to determine the z-component, which is the largest one of the electric field gradient. The electric field gradient /EFG/ is found to vary with different compounds of barium. The method is found to be useful in describing the chemical influences on the attenuation of angular correlations and hence in the study of EFG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163715
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  • 4
    Electronic Resource
    Electronic Resource
    Application of the sum peak method to study perturbed angular correlation parameters as a function of pH value and gelatin concentration in the decay of160Dy (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 154 (1991), S. 413-419 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The γ-γ sum peak method based on the phenomenon of perturbed angular correlation has been applied to see the effect of chemical environment on the directional correlation coefficients of various cascades and to check the suitability of160Tb as a probe. No change in sum peak intensity ratios for different pH and gelatin concentration values have been seen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02169774
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics of release of potassium by sodium tetraphenyl boron from some top soil samples of Red (Alfisols), Black (Vertisols) and Alluvial (Inceptisols and Entisols) soils of India (1992)
    Springer
    Nutrient cycling in agroecosystems 32 (1992), S. 135-138 
    Details
    ISSN: 1573-0867
    Keywords: Kinetics of potassium release ; sodium tetraphenyl boron ; red ; black and alluvial soils ; India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Alluvial (Inceptisols and Entisols) soils containing illite as dominant clay mineral released significantly higher amounts of K to 0.3 M NaTPB than smectitic Black (Vertisols) and kaolinitic Red (Alfisols) soils. Exchange rate indices derived from the plots of K released to 0.3 M NaTPB versus log t were also higher for illitic soils than for kaolinitic and smectitic soils. Magnitudes of both surface and internal K released from different soils were in the sequence: illitic 〉 smectitic 〉 kaolinitic. Data of K release to 0.3 M NaTPB could be described by first order rate equation. In parabolic plots, existence of a linear relationship throughout the period of exchange with NaTPB indicated the absence of film diffusion controlled processes. Diffusion coefficients calculated from radial diffusion equation were dependent upon texture and clay mineralogy of soils and decreased sharply with time for kaolinitic and smectitic soils. Illitic soils, however, maintained higher values of diffusion coefficients over extended periods of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048774
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  • 6
    Electronic Resource
    Electronic Resource
    Micronutrients and nitrogen metabolism (1987)
    Springer
    Plant and soil 103 (1987), S. 51-55 
    Details
    ISSN: 1573-5036
    Keywords: ammonium ; assimilation ; maize ; micronutrients ; nitrate ; nitrogen ; metabolism ; protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A sand-culture experiment was conducted to study the influence of a deficiency of and an excess of micronutrients on the uptake and assimilation of NH 4 + and NO 3 − ions by maize. By studying the fate of15N supplied as15NH4NO3 or NH4 15NO3, it was demonstrated that in maize plants NH4−N was absorbed in preference to NO 3 − −N. The uptake and distribution of N originating from both NH 4 + and NO 3 − was considerably modified by deficiency of, or an excess of, micronutrients in the growth medium. The translocation of NH 4 + −N from roots to shoots was relatively less than that of NO 3 − −N. Deficiency as well as excessive amounts of micronutrients, in the growth medium, substantially reduced the translocation of absorbed N into protein. This effect was more pronounced in the case of N supplied as NO 3 − . Amino-N was the predominant non-protein fraction in which N from both NH 4 + and NO 3 − tended to accumulate. The next important non-protein fractions were NO 3 − −N when N was supplied as NO 3 − and amide-N when NH 4 + was the source. The relative accumulation of15N into different protein fractions was also a function of imposed micronutrient levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370667
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  • 7
    Electronic Resource
    Electronic Resource
    Organo-metallic phosphates (1975)
    Springer
    Plant and soil 43 (1975), S. 317-326 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Humic and fulvic acids extracted from a mollisol and manure were used to determine their zinc-complexing capacity by ion-exchange equilibrium method. The simultaneous chelation of phosphorus by organic-matter preparations in the presence of complexed zinc was also studied. The results indicated that phosphorus is bonded to humic and fulvic acids in the presence of complexed zinc. Phosphate ions in such complexes probably act as additional ligands in bridging the organo-metal units. The stability constants of zinc complexes increased whereas the free-energy change accompanying their formation recorded lower negative values in the presence of phosphorus and at higher pH. Zinc fulvic salts and complexes being less stable but mobile should enhance the movement of zinc ions to plant roots and yield of crops in deficient soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928495
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  • 8
    Electronic Resource
    Electronic Resource
    Organo-metallic phosphates (1975)
    Springer
    Plant and soil 43 (1975), S. 317-326 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Humic and fulvic acids extracted from a mollisol and manure were used to determine their zinc-complexing capacity by ion-exchange equilibrium method. The simultaneous chelation of phosphorus by organic-matter preparations in the presence of complexed zinc was also studied. The results indicated that phosphorus is bonded to humic and fulvic acids in the presence of complexed zinc. Phosphate ions in such complexes probably act as additional ligands in bridging the organo-metal units. The stability constants of zinc complexes increased whereas the free-energy change accompanying their formation recorded lower negative values in the presence of phosphorus and at higher pH. Zinc fulvic salts and complexes being less stable but mobile should enhance the movement of zinc ions to plant roots and yield of crops in deficient soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928495
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  • 9
    Electronic Resource
    Electronic Resource
    Micronutrients and nitrogen metabolism (1983)
    Springer
    Plant and soil 73 (1983), S. 355-363 
    Details
    ISSN: 1573-5036
    Keywords: Aminopeptidase ; Micronutrients ; Molecular weight ; Water-soluble proteins ; Zea mays L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Deficient as well as toxic levels of micronutrients either Co, Cu, Mn, Mo or Zn in the growth medium resulted in a significant decrease in dry matter accumulation and amount of total as well as protein N, increase in the content of total N and water-soluble protein content and caused some change in protein amino acid composition in maize plants as compared to the control. Activity of alkaline aminopeptidases was significantly higher due to deficiency or toxicity of the elements. Sephadex fractionation and gel acrylamide electrophoresis of tissue extract revealed the dominance of low-molecular-weight proteins in maize shoots in both the situations. The results of the present investigation suggest that restriction in protein synthesis under the deficiency as well as toxicity of micronutrients in the growth medium is associated with the accumulation of low-molecular-weight in the plant tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184312
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of zinc and sulphur deficiency on oil-filling in peanut (Arachis hypogaea L.) kernels (1987)
    Springer
    Plant and soil 103 (1987), S. 261-267 
    Details
    ISSN: 1573-5036
    Keywords: Arachis hypogaea L. ; developing kernel ; lipid composition ; Zn and S deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the developing peanut (Arachis hypogaea L.) kernels, the period between 15 and 35 days after podding (DAP) was identified as the active period of oil-filling. The period of active oil-filling was associated with a decrease in the starch, soluble sugars and proteins so as to make available the energy and carbon skeleton for the synthesis of oil. The oil content in the mature kernels decreased by 11, 12 and 25 per cent with Zn, S and Zn+S deficiency, respectively. In addition, proteins and starch content decreased significantly while that of soluble sugars increased slightly. The activity of malate dehydrogenase and glucose-6-phosphate dehydrogenase also decreased due to Zn as well as S deficiency. The deficiency treatments resulted in a decrease in phospholipids, free fatty acids and triacylglycerols in mature kernels. Further the proportion of 16∶0 and 18∶2 decreased while that of 18∶1 increased in developing kernels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370398
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