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  • 1
    Electronic Resource
    Electronic Resource
    Effect of wastewater discharge on nutrient contamination of mangrove soils and plants (1995)
    Springer
    Hydrobiologia 295 (1995), S. 243-254 
    Details
    ISSN: 1573-5117
    Keywords: mangrove ; soil/sediment ; plant ; wastewater ; sink ; nutrients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ecological impact of sewage discharges to a mangrove wetland in Futian National Nature Reserve, the People's Republic of China was assessed by comparing the plant community, plant growth and nutrient status of soils and vegetation of a site treated with settled municipal wastewater (Site A) with those of a control adjacent site (Site B) which did not receive sewage. During the one year study, the total and available N and P, and organic carbon concentrations of mangrove soils in Site A did not significantly differ from those of Site B. In both sites, the soil organic C, total N, NH4 }-N and total P content exhibited a descending trend from landward to seaward regions, with the lowest measurements obtained from the most foreshore location. Seasonal variation in N content of soil samples was more obvious than any difference between wastewater treated and the control sites. The soil N content was lower in spring and summer. This was attributed to the higher temperature in these seasons which facilitated degradation of organic matter and absorption of nitrogen by the plants for growth. No significant difference in plant community structure, plant growth (in terms of tree height and diameter) and biomass was found between Sites A and B. Leaf samples of the two dominant plant species, Kandelia candel and Aegiceras corniculatum collected from Site A had comparable content of organic carbon, N, P and K to those Site B. These preliminary results indicated that the discharge of a total volume of 2600 m3 municipal wastewater to an area of 1800 m2 mangrove plants over the period of a year did not produce any apparent impact on growth of the plants. The soils and plant leaves of Site A were not contaminated, in terms of nutrient content, by the discharged sewage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029131
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of synthethic waster on young Kandelia candel plants growing under greenhouse conditions (1995)
    Springer
    Hydrobiologia 295 (1995), S. 263-273 
    Details
    ISSN: 1573-5117
    Keywords: Mangrove ; Kandelia candel ; seedling ; growth ; wastewater ; pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A greenhouse experiment wad performed to evaluate the effects of synthethic wastewater in three different strengths, NW, MW and CW, on the growth of the one-year old Kandelia candel (L.) Druce plants. NW had the characteristics and strength similar to natural municipal wastewater while MW and CW contained five and ten times of the nutrients and heavy metals in NW, respectively. Artificial seawater was used as the control. During one year wastewater treatment experiment, Kandelia were found to withstand wastewater of high strength and toxic symptoms were not detected in all plants. Synthethic wastewater with strength similar to the natural municipal sewage (NW) stimulated plant growth. The plants treated with NW had significantly higher aerial and root biomass, taller stem than those found in the CW, MW and the control. Maximum growth, in terms of both stem height and total biomass, of all plants occured in summer months, from June to September. With respect to the physiological and biochemical activities, CW and MW treated plants had significantly lower levels of chlorophyll a, total chlorophyl and catalase activity than those found in NW and control groups. In contrast, the proline content of plants treated with wastewater was similar to that of the control. These result suggest that normal wastewater (NW), attributed to its nutrients and trace elements, enhanced plant growth. The medium (MW) and concentrated wastewater (CW) supported similar amount of plant growth as the control but the physiological and biochemical parametes indicate that these treated plants might have been exposed to some kind of stress, probably due to the heavy metals present in MW and CW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029133
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  • 3
    Electronic Resource
    Electronic Resource
    Triplet repeats in clinical subtypes of schizophrenia: variation at the DRPLA (B37 CAG repeat) locus is not associated with periodic catatonia (1994)
    Springer
    Journal of neural transmission 98 (1994), S. 153-157 
    Details
    ISSN: 1435-1463
    Keywords: Association study ; B37 CAG repeat locus ; chromosome 12 ; schizophrenia ; periodic catatonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Clinical evidence for a dominant mode of inheritance and anticipation in periodic catatonia, a distinct subtype of schizophrenia, indicates that genes with triplet repeat expansions or other unstable repetitive elements affecting gene expression may be involved in the etiology of this disorder. Because patients affected with dentatorubral-pallidoluysian atrophy (DRPLA) may present with “schizophrenic” symptoms, we have investigated the DRPLA (B 37 CAG repeat) locus on chromosome 12 in 41 patients with periodic catatonia. The B 37 CAG repeat locus was highly polymorphic but all alleles in both the patient and control group had repeat sizes within the normal range. We conclude that variation at the DRPLA locus is unlikely to be associated with periodic catatonia. The evidence for dominant inheritance and anticipation as well as the high prevalence of human brain genes containing trinucleotide repeats justifies further screening for triplet repeat expansions in periodic catatonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277018
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    Paper (German National Licenses)
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