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  • 1
    Electronic Resource
    Electronic Resource
    Effect of potassium on growth and nitrate reductase during water stress and recovery in maize (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 49 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The effect of potassium (0,50, 100 and 200 mg/pot) was studied on growth characteristics and nitrate reductase activity in maize (Zea mays) seedlings during water stress and subsequent recovery. In irrigated plants K+ increased the rate of leaf area expansion, leading to increased leaf area per plant. Increased leaf area was associated with decreased chlorophyll content. Water stress (–15 bars) enhanced the stomatal resistance of leaves which was further accentuated by K+ application. Nitrate reductase activity rose in irrigated plants 24 h after K+ application. Subsequently, as water stress developed, K+ helped to maintain higher NR activity for the first two days. However, K+ had no effect on half life of NR in light or darkness. During recovery from stress K+ aided to maintain the higher leaf expansion rate, the chlorophyll content and the stomatal resistance. The results above are discussed in relation to the ability of K+ to maintain better growth under water stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb03340.x
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  • 2
    Electronic Resource
    Electronic Resource
    Biological nitrogen fixation at elevated temperature in different Azospirillum species and strains (1995)
    Springer
    Biology and fertility of soils 20 (1995), S. 260-262 
    Details
    ISSN: 1432-0789
    Keywords: Azospirilla ; Nitrogenase activity ; Elevated temperature ; Acetylene reduction activity ; Azospirillum brasilense ; Azospirillum lipoferum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogenase activity, nitrogenase synthesis, and the growth of four species of Azospirillum were examined at 30°C and 42°C. Azospirillum brasilense Sp 7 did not synthesize nitrogenase at 42°C nor was the enzyme stable at this temperature. In A. lipoferum 708 and A. brasilense 12S the nitrogenase activity was stable at 42°C but the synthesis of nitrogenase was reduced. In A. brasilense Sp 9 the nitrogenase activity was stable and showed the highest C2H2 reduction activity at 42°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336087
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of irrigation on tillering in wheat, triticale and barley in a water-limited environment (1981)
    Springer
    Irrigation science 2 (1981), S. 225-235 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of irrigation on tillering and tiller mortality in varieties of wheat (Triticum aestivum and T. durum), triticale and barley was studied under field conditions. Low temperature in the early stages of growth promoted production of tillers whereas increase in temperature during extension growth phase increased tiller mortality. More than 1000 tillers m−2 were produced with five irrigations but 40% or more died. With limited water availability tiller production was reduced but so was their mortality. Grain yield in wheat and triticale was positively correlated with productive tillers and negatively correlated with the maximum number of tillers produced in wheat and barley grown under limited irrigation conditions. Varieties with a capacity to produce fewer tillers were identified. Some of them proved more stable in yield. No correlation was found between tiller number and grain yield in the frequently irrigated treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258376
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of irrigation on tillering in wheat, triticale and barley in a water-limited environment (1982)
    Springer
    Irrigation science 3 (1982), S. 209-209 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446009
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative thermal analysis study of two biopolymers, starch and cellulose (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 7-17 
    Details
    ISSN: 1572-8943
    Keywords: cellulose ; starch ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The degradation of cellulose and starch samples in air and nitrogen has been investigated by thermal analysis techniques. The techniques employed were differential thermal analysis, rising temperature and temperature jump thermogravimetry. Rate data were obtained from these experiments and Arrhenius parameters calculated from these values. This data was used to determine the mechanism by which the cellulose and starch samples degraded. The Arrhenius parameters were also calculated. The behavior of starch and cellulose upon thermal analysis were compared and are reported.E act for corn starch was found to be 474 kJ mol−1 and for a cellulose 242 kJ mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979545
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  • 6
    Electronic Resource
    Electronic Resource
    The use of thermogravimetry to follow the rate of evaporation of an ingredient used in perfumes (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 595-599 
    Details
    ISSN: 1572-8943
    Keywords: methyl benzoate ; perfumes ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ingredients used in the manufacture of perfumes can be investigated by thermogravimetry. In this study the evaporation of methyl benzoate was investigated using a simultaneous TG-DTA unit. A rising temperature method of thermal analysis was used for the study. The rate of evaporation of the ingredient was calculated from a simple plot of percentage mass lossvs. time. A derivative plot of the same was used to calculate the coefficient of evaporation in a controlled atmosphere and regulated air flow rate. In a series of programmed temperature runs on the TGDTA unit it was shown that the evaporation process is zero order, and that the evaporation coefficients at each temperature can be fitted into the Arrhenius equation. The energy of activation, Eact can be calculated from the slope of the line. It was found to be 47 kJ mol−1. This value was compared and shown to approach the enthalpy of vaporization as calculated using the Troutons or Clausius Clapeyron equation
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996741
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  • 7
    Electronic Resource
    Electronic Resource
    The use of the temperature signal and its derivative in a TG-DTA simultaneous unit (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 719-726 
    Details
    ISSN: 1572-8943
    Keywords: aluminum ; carbon black ; DTA ; indium ; TG ; zinc ; zinc oxalate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Simultaneous TG-DTA units have a work station which allows plots to be made of temperature against time, as well as the conventional TG and DTA plots. These time-temperature plots and their derivatives can be used to show details of both exothermic and endothermic events. The melting behavior of zinc is used as illustrative of endothermic phase changes. Solid-solid transitions are exemplified by noting the transitions in quartz. Examples of chemical reactions being treated to temperature-time plots are the decomposition's of zinc oxalate in nitrogen (an endothermic event) and the oxidation of carbon black in air (a sustained exothermic event). This wide selection of exothermic and endothermic events serves to illustrate the details which can be drawn from any thermogravimetric plot irrespective of the other associated equipment present, which serves to reinforce the data presented in the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979202
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  • 8
    Electronic Resource
    Electronic Resource
    The production of active carbon from corn cobs by chemical activation (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 525-531 
    Details
    ISSN: 1572-8943
    Keywords: activation ; carbon ; corn cobs ; SEM ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Corn cobs obtained as waste from the corn industry, were analyzed by a TG-DTA unit in an atmosphere of flowing nitrogen. The carbonaceous products so formed were then produced on a preparative scale and activated chemically using potassium hydroxide. This resulted in the formation of a carbon with a very high surface area. The active carbon produced was then examined using thermal analysis in the temperature jump mode on a thermogravimetry unit. From this data the kinetics of degradation of the active carbon was determined using zero order rate kinetics. The pore structure of the active material was also examined using SEM. TheE a for activated corn cobs was found to be 106 kJ mol−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979025
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  • 9
    Electronic Resource
    Electronic Resource
    Reaction of wood with inorganic salts (1998)
    Springer
    Holz als Roh- und Werkstoff 56 (1998), S. 412-415 
    Details
    ISSN: 1436-736X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Hevea brasiliensis (Gummibaum) und Acacia auriculaeformis wurden mit Lösungen von CrO3, FeCl3 und Fe(NO3)3 behandelt. Anschließend wurden die wasserabweisende Wirkung sowie Reaktionen mit den Holzbestandteilen untersucht. Die FTIR-Spektren von Holzoberflächen, die mit CrO3 behandelt waren, deuten auf die Bildung eines wasserunlöslichen Komplexes zwischen CrO3 und den aromatischen Ringen von Lignin hin. Im Falle der Eisensalze findet keine Reaktion statt. Durch die Chrombehandlung wird im Holz eine wasserabstoßende Wirkung erzielt.
    Notes: Hevea brasiliensis (Rubber wood) and Acacia auriculaeformis treated with aqueous solutions of chromium trioxide, ferric chloride and ferric nitrate were studied for water repellency and their reaction with wood constituents. FTIR spectra obtained from wood surface treated with chromium trioxide indicate the formation of a water insoluble complex between chromium trioxide and aromatic ring of lignin, whereas no reaction takes place with ferric salts. Treatment of wood by chromium trioxide was found to be effective in imparting water repellency in wood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001070050343
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  • 10
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    Biological nitrogen fixation at elevated temperature in different Azospirillum species and strains (1995)
    Springer
    Details
    Publication Date: 1995-09-01
    Print ISSN: 0178-2762
    Electronic ISSN: 1432-0789
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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