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  • 1985-1989  (6)
  • Chemical Engineering  (2)
  • Nitrogen fixation  (2)
  • Oxalates  (2)
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Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Nitrogen fixation and balance studies of rice soil (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 15-19 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Nitrogen fixation ; N-balance studies ; Azolla ; Blue-green algae ; Chemical N fertilization ; Rice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A nitrogen balance study conducted in ceramic pots under net house conditions for four seasons showed that flooded rice soil leaves a positive nitrogen balance (N increase) in soil after rice cropping in both fertilized and unfertilized soil. Recovery of nitrogen from rice soil was more than its input in unfertilized soil, but it was reverse in fertilized soil. Incorporation of Azolla or BGA twice as basal and 20 days after transplanting (DAT) alone or in combination showed higher nitrogen balance and N2-fixation (N gain) in soil than in that where it was applied once either as basal or 20 DAT. Planted soil showed more N2-fixation than that of fallow rice, and flooded soil fixed more nitrogen in comparison to non-flooded soil in light but less in dark. Soil exposed to light fixed more nitrogen than that of unexposed soil in both flooded and non-flooded conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00280345
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  • 2
    Digitale Medien
    Digitale Medien
    Sodium is neither a risk nor a protective factor in urolithiasis? (1987)
    Springer
    Urological research 15 (1987), S. 105-108 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Sodium ; Inhibitory activity ; Oxalates ; Phosphates ; Calcium ; Calculi
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary the effect of changes in urinary sodium, induced by dietary manipulation in normal subjects (NS) and in stone formers (SF) was studied by observing crytalluria qualitatively and by determining calcium, oxalate and phosphate crystallization quantitatively in an experimental model. In SF the calcium crystallization was significantly higher than in NS at all the three levels of urinary sodium studied. However, no difference was observed in oxalate and phosphate crystallization rates between these two groups. Calcium and oxalate (p〈 0.05) and oxalate and phosphate (p〈 0.001) were found to be correlated in NS but were non-significant in SF. The wide changes in the urinary sodium induced by dietary changes did not influence the crystallization rate of calcium, nor of oxalate and phosphate in NS as well as in SF. The results suggested that a sodium intake with lower and upper limits of 124 mg and 6,009 mg respectively did not act as “inhibitor” of crystallization rate nor did it induce hypercalciuria severe enough to pose a “risk” of stone formation. The results did not suggest that a high urinary sodium increases the solubility of calcium phosphate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00260942
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  • 3
    Digitale Medien
    Digitale Medien
    Urinary biochemical profile of patients with ureteric calculi in Jodhpur region (north western India) (1988)
    Springer
    Urological research 16 (1988), S. 105-110 
    Details
    ISSN: 1434-0879
    Schlagwort(e): Ureteric stone formers ; Urine chemistry ; Oxalates ; Calcium ; Risk index ; Ion activity product
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Urine chemistry of 42 normal subjects (NS) and 59 ureteric stone formers (SF) from Jodhpur region of Rajasthan, India is presented. Twenty four hour urinary levels of calcium, oxalic acid and uromucoids were significantly higher and levels of magnesium, citric acid and inorganic phosphorus were significantly lower in SF as compared to NS. No significant difference was observed in the uric acid, sodium and potassium levels in the two groups. Significant correlation was observed between calcium and magnesium; calcium and oxalic acid; calcium and citric acid; magnesium and oxalic acid; and oxalic acid and citric acid in NS on the basis of mmol/l but not on the basis of mmol/24 h. Calcium and oxalic acid correlation was uninfluenced by magnesium and citric acid levels. The log of risk factor index (RI) was higher (p〈 0.001) in SF (−1.652) as compared to NS (−2.103). The log of ion activity product (IAP) was also higher (p〈 0.001) in SF (−3.192x10−3) than in NS (−2.914x10−1). Based on RI and IAP, a scale has been devised for the prediction of the risk of stone formation and recurrence.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00261966
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  • 4
    Digitale Medien
    Digitale Medien
    Rice yields as influenced by Azolla N2 fixation and urea N-fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 63-68 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Azolla pinnata ; Nitrogen fixation ; N yield ; Oryza sativa ; Urea-N
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Application of 0, 30, 60, 90 and 120 kg N ha−1 of urea (U) in split doses with (and without)Azolla pinnata, R. Brown was studied for three consecutive seasons under planted field condition. Fresh weight (FW), acetylene reduction activity (ARA) and N yield of Azolla were found to be maximum 14 days after inoculation (DAI). Among the different treatments, maximum Azolla growth was recorded in no N control. The FW, ARA and N yield of Azolla were inhibited increasingly with the increase in N levels. Irrespective of season, FW and N yield of Azolla were inhibited only a small extent with 90 kg N ha−1 U, beyond which the inhibition was pronounced. ARA was inhibited only slightly up to 60 kg N ha−1 of U. Grain yield and crop N uptake of rice increased significantly up to 90 kg N ha−1 of U (alone or in combination with Azolla) in the dry seasons (variety IR 36) and up to 60 kg N ha−1 U in the wet season (variety CR 1018).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02203082
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  • 5
    Digitale Medien
    Digitale Medien
    Microstructure and mechanical behavior of reinforced reaction injection molded (RRIM) polyurethane (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1258-1264 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A study was carried out to characterize the microstructure and distribution of some mechanical properties in reinforced reaction injection molding panels (RRIM). The panels were prepared under a variety of processing conditions. Scanning electron microscopy, differential scanning calorimetry, and Fourier transform infrared analysis were employed for microstructure characterization. The following mechanical tests were carried out: dynamic mechanical, tensile, and impact. The results indicate significant relationships between processing conditions, microstructure, and mechanical properties. In particular, the skin/core structure of the panels and the size distribution of bubbles in the matrix have an important effect on the impact properties. Furthermore, the balance between the distributions of cure and crystallinity, which is difficult to define clearly, plays an important role in determining panel behavior.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760271609
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  • 6
    Digitale Medien
    Digitale Medien
    The effect of processing variables on microstructure of injection molded short fiber reinforced polypropylene composites (1989)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 10 (1989), S. 344-351 
    Details
    ISSN: 0272-8397
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: Injection molded composites of polypropylene reinforced with short glass fibers were obtained under a variety of injection molding conditions. The microstructure of the moldings was determined using a variety of experimental techniques, including optical and scanning electron microscopy, differential scanning calorimetry, Fourier transform infra-red spectroscopy, and thermogravimetry. Thus, it was possible to obtain a detailed characterization of the crystallinity, morphology, and orientation distribution in the matrix, in addition to the distribution of fibers and their orientation of the fibers in the composite. The influence of molding conditions on the above microstructural characteristics is summarized in an effort to explain the experimental observations.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pc.750100511
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