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  • 1
    Electronic Resource
    Electronic Resource
    Nitrous oxide emission from wetland rice soil as affected by the application of controlled-availability fertilizers and mid-season aeration (2000)
    Springer
    Biology and fertility of soils 32 (2000), S. 60-66 
    Details
    ISSN: 1432-0789
    Keywords: Key words Nitrous oxide flux ; Inorganic nitrogen concentrations ; Soil water ; Wetland rice soil ; Re-flooding period
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  N2O emission from a wetland rice soil as affected by the application of three controlled-availability fertilizers (CAFs) and urea was investigated through a pot experiment. N2O fluxes from the N fertilized paddy soil averaged 44.8–69.3 μg N m–2 h–1 during the rice growing season, accounting for 0.28–0.51% of the applied N. The emission primarily occurred during the mid-season aeration (MSA) and the subsequent re-flooding period. Fluxes were highly correlated with the NO3 – and N2O concentrations in the soil water. As there were relatively large amounts of NH4 +-N present in the soil of the CAF treatments at the beginning of MSA, leading to large amounts of NO3 –-N during the MSA and the subsequent re-flooding period, the tested CAFs were not effective in reducing N2O emission from this paddy soil. The potential of applied CAFs to reduce N2O emissions from paddy soil is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740000215
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  • 2
    Electronic Resource
    Electronic Resource
    Axogenesis in the human fetal auditory system, demonstrated by neurofilament immunohistochemistry (1996)
    Springer
    Anatomy and embryology 195 (1996), S. 15-30 
    Details
    ISSN: 1432-0568
    Keywords: Key words Morphogenesis ; Neurofibrils ; Cochlear nerve ; Cochlear nuclei ; Inferior colliculus ; Antigen retrieval
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Morphological, electrophysiological and behavioral evidence indicates that the onset of rapid, synchronized conduction of auditory impulses occurs in the human brainstem during the 28th–29th fetal weeks. This implies that axonal connections in the brainstem auditory pathway are generated prior to this time. In order to investigate the sequence of axogenic events in the human brainstem pathway, we employed immunohistochemical techniques and an antibody to neurofilament protein. Immunostaining for axonal neurofilaments in an age-graded series of fetal brains demonstrates that a small number of cochlear nerve axons have invaded the ventral cochlear nucleus by the 16th fetal week. By this same time point, a limited number of trapezoid body-lateral lemniscus axons have reached the superior olivary complex and inferior colliculus. Between gestational weeks 16 and 26, there is marked expansion and collateralization of the ascending pathway from cochlear nerve to inferior colliculus. By week 26, ascending axons have begun to form plexuses of terminal neuropil within all of the brainstem auditory nuclei. Beginning in week 22, there is development of commissural axons (dorsal commissure of the lateral lemniscus and commissure of the inferior colliculus) and descending projections (descending collicular axons and olivocochlear bundle). This early establishment of a mature pattern of axonal connections presumably forms the basis for the appearance of myelin, acousticomotor reflexes and recordable brainstem responses by fetal week 29.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004290050021
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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