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  • 1
    Monograph available for loan
    Monograph available for loan
    The geology of South Africa (2006)
    Johannesburg : Geological Soc. of South Africa
    Details Availability
    Call number: 9/M 09.0092
    Type of Medium: Monograph available for loan
    Pages: xii, 691 S.
    ISBN: 1919908773 , 978-1-919908-77-9
    Classification:
    Regional Geology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of nitrogen deficiency on nitrate reductase, nitrate assimilation and photosynthesis in unicellular marine algae (1983)
    Springer
    Marine biology 77 (1983), S. 101-105 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrate reductase (NR) activity appeared in ammoniumgrown cultures of 5 species of marine algae, representing 4 classes, after a short period of nitrogen starvation. In nitrogen-limited chemostat cultures of Nannochloropsis oculata and Chlorella stigmatophora there was an inhibition of photosynthetic carbon fixation during nitrate assimilation. In these organisms, nitrate assimilation was light-dependent and inhibited by 3-(3′,4′-dichloro-)-1-1-dimethyl urea (DCMU). In N. oculata, an obligate autotroph, nitrite assimilation was dependent on light absolutely. Physiological changes that occur in these organisms during nitrogen deficiency enable them to assimilate nitrogen rapidly when it becomes available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396306
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  • 3
    Electronic Resource
    Electronic Resource
    Assessing the organic phosphorus status of an Oxisol under tropical pastures following native savanna using 31P NMR spectroscopy (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 332-339 
    Details
    ISSN: 1432-0789
    Keywords: Soil phosphorus ; Organic P species ; 31P NMR spectroscopy ; Improved tropical pastures ; Acid savanna soils ; Earthworm casts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract 31P nuclear magnetic resonance (NMR) spectroscopy, P fractionation, and a P sorption experiment were used to follow the changes in P in the A horizons (0–10 cm) of acid savanna soils, Colombia, after little P fertilization and 15 years' continuous growth of a grass (Brachiaria decumbens) and a grass/legume (B. decumbens+Pueraria phaseoloides) pasture. Ready P supply as analyzed by Bray P was low under native savanna (1.3 mg kg-1 soil) and responded moderately on pasture establishment. Concurrently, the affinity of the soil for inorganic P declined slightly after pasture establishment. 31P NMR spectroscopy revealed that P associated with humic acids was dominated by monoester P followed by diester P. Smaller proportions were observed for phosphonates, teichoic acid P, orthophosphate, and pyrophosphate. P associated with fulvic acids had lower proportions of diester P and higher contents of orthophosphate. Under native savanna the reserves of labile organic P species (phosphonates and diester P including teichoic acid P) associated with humic and fulvic acids were 12.4 and 1.1 kg ha-1, respectively, and increased to 18.1 and 1.8 kg ha-1 under grass pasture, and to 19.5 and 2.3 kg ha-1 under grass/legume pasture. These data emphasize the importance of labile organic P species in the P supply for plants in improved tropical pastures, and further indicate that humic acid P in particular responds to land-use changes within a relatively short time-scale. Earthworm casts were highly abundant in the B. decumbens+P. phaseoloides plot and were enriched in labile organic P species. We conclude that earthworm activity improves the P supply in soil under tropical pastures by creating an easily available organic P pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335963
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  • 4
    Electronic Resource
    Electronic Resource
    Assessing the organic phosphorus status of an Oxisol under tropical pastures following native savanna using 31P NMR spectroscopy (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 332-339 
    Details
    ISSN: 1432-0789
    Keywords: Key words Soil phosphorus ; Organic P species ; 31P NMR spectroscopy ; Improved tropical pastures ; Acid savanna soils ; Earthworm casts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract 31P nuclear magnetic resonance (NMR) spectroscopy, P fractionation, and a P sorption experiment were used to follow the changes in P in the A horizons (0–10 cm) of acid savanna soils, Colombia, after little P fertilization and 15 years’ continuous growth of a grass (Brachiaria decumbens) and a grass/legume (B. decumbens+Pueraria phaseoloides) pasture. Ready P supply as analyzed by Bray P was low under native savanna (1.3 mg kg–1 soil) and responded moderately on pasture establishment. Concurrently, the affinity of the soil for inorganic P declined slightly after pasture establishment. 31P NMR spectroscopy revealed that P associated with humic acids was dominated by monoester P followed by diester P. Smaller proportions were observed for phosphonates, teichoic acid P, orthophosphate, and pyrophosphate. P associated with fulvic acids had lower proportions of diester P and higher contents of orthophosphate. Under native savanna the reserves of labile organic P species (phosphonates and diester P including teichoic acid P) associated with humic and fulvic acids were 12.4 and 1.1 kg ha–1, respectively, and increased to 18.1 and 1.8 kg ha–1 under grass pasture, and to 19.5 and 2.3 kg ha–1 under grass/legume pasture. These data emphasize the importance of labile organic P species in the P supply for plants in improved tropical pastures, and further indicate that humic acid P in particular responds to land-use changes within a relatively short time-scale. Earthworm casts were highly abundant in the B. decumbens+P. phaseoloides plot and were enriched in labile organic P species. We conclude that earthworm activity improves the P supply in soil under tropical pastures by creating an easily available organic P pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335963
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  • 5
    Electronic Resource
    Electronic Resource
    A New Species of Nematodirus in Sheep (1951)
    [s.l.] : Nature Publishing Group
    Nature 168 (1951), S. 559-559 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nematodirus battus n.sp. Body attenuated anteriorly. Mouth surrounded by six papillae. Cephalic cuticle dilated. Male : Length 10-13 mm., maximum diameter 0-12-0-13 mm. Bursa with two large lateral lobes ; dorsal lobe small. Ventro-ventral and latero-ventral close and parallel; laterals arise from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/168559a0
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature dependence of strain in ZnSe(epilayer)/GaAs(epilayer) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6569-6573 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of biaxial strain as a function of temperature in a ZnSe epilayer grown on a GaAs substrate is presented. The strains are determined by measuring the heavy- and light-hole related excitonic transitions via photomodulated spectroscopy. The strain is found to increase with increasing temperature. The data are compared with a calculation using a previously determined elastic constant and thermal expansion coefficients. The temperature dependence determined here allows a comparison of various other optical measurements performed at different temperatures. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360477
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  • 7
    Electronic Resource
    Electronic Resource
    The role of the legume in the nitrogen cycle of productive and sustainable pastures (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 47 (1992), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The role of the legume in the nitrogen (N) cycle was examined in grazed pastures receiving no N fertilizer of both temperate and tropical regions by simulating the fluxes of N through different processes of the cycle. The amounts of legume-fixed N required to balance the cycle without invoking a drain on soil organic N reserves (i.e. no net N mineralization) was estimated to vary from 38 to 53% of the above-ground herbage N or from 20 to 31% on a dry matter (DM) basis for tropical pasture systems with a range of pasture utilization of 10–40%. At higher pasture utilization levels of 50-70%, more typical of intensively grazed temperate pastures, the N input requirement in the absence of fertilizer N would be 57-67% of the aboveground herbage N or 35-45% DM. An examination of the role of each contributory process of recycling (viz. excreta returns, internal cycling or remobilization from senescing tissues, litter decomposition) suggests that variations in the amounts of internally cycled N would have the greatest impact on the requirement for biologically fixed N at low levels of pasture utilization (10-40%), while at high pasture utilization levels of 70%, variations in the recovery of excreta-N would have a major effect on the requirement for fixed-N to balance the cycle.The amounts of biologically fixed N required to sustain a range of herbage DM yields of 3-22 t DM ha −1 yr−1 would range from 15 to 158 kg N ha−1 yr−1 for tropical pastures. For intensively managed temperate pastures producing 6-15 t DM ha−1 yr−1 with a N content of 3·5%, a range of fixation of 120-352 kg N ha−1 yr−1 is required. These simulations indicate how legume contents of 20-45% of herbage DM could contribute to productive and sustainable (in terms of N) pasture systems of both temperate and tropical regions
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1992.tb02256.x
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  • 8
    Electronic Resource
    Electronic Resource
    ROUNDWORM INFESTATION IN LAMBS (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 23 (1968), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1968.tb00569.x
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  • 9
    Electronic Resource
    Electronic Resource
    The effects of grazing with and without excretal returns on the accumulation of nitrogen by ryegrass in a continuously grazed upland sward (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 45 (1990), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Rates of N accumulation were studied on sheep grazed grass swards maintained at a constant height of 5 cm for two growing seasons (1985 and 1986) and receiving no N fertilizer using a tiller tissue turnover technique. Grazing with normal excretal returns resulted in an 85-105% increase in the estimated rates of N accumulation by laminae compared with similarly grazed swards where excretal returns were prevented. Generally, increases in tiller numbers in plots receiving excreta were mainly responsible for the increased rates of N accumulation, rather than increased rates of N accumulation per tiller. Rates of N remobilization from laminae and senescence (flux of N to standing-dead litter pool) per tiller, and rates of leaf extension and leaf appearance/disappearance were unaffected by excretal returns, in urine patches increased tiller numbers and increased rates of accumulation per tiller both resulted in greater estimates of N accumulation compared with tillers not visibly affected by excreta. However, at any one time only about 11% of the plot area was affected by excreta and increases in N accumulation in excreta patches could not account for the overall plot increases in rates of N accumulation.The increased tillering in plots receiving excreta may have increased exploitation of the soil N. With an average stocking rate of 15 sheep ha−1, soil nitrate-N, but not total N (Kjeldahl) nor bulk density, was increased during the winter of the second year as a result of excretal returns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.1990.tb02183.x
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  • 10
    Electronic Resource
    Electronic Resource
    Sulfonation and Nitration Reaction Promoted by Boron Fluoride (1940)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 32 (1940), S. 408-410 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50363a030
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