GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Monitoring biochemical activity during sewage sludge composting (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 145-150 
    Details
    ISSN: 1432-0789
    Keywords: Sewage sludge ; Composting ; Enzyme activity ; Respiration ; ATP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A sewage sludge with the addition of two woody materials (1 : 2 ratio), tree-pruning chips and vine shoots, to provide structure were composted under controlled conditions of temperature (28°C) and humidity (70% ambient humidity). Hydrolytic enzyme activities [urease, phosphatase, N-benzoil l-argininamide (BBA) hydrolysing protease, casein-hydrolysing protease, ATP, hydrosoluble and hydrolysable polysaccharides] were determined during the aerobic incubation. Samples were taken and incubated under the same conditions in an accelerative bioreactor to test potential C mineralisation by measuring the CO2 evolved. A rapid mineralisation phase (2–3 weeks) was followed by a slow maturation (4–14 weeks) period. The slow phase and the dynamics of substrate decomposition were better indicated by the hydrolytic enzyme activities that were measured. The structuring agents slightly retarded the compositing process with tree prunings having the strongest effect. Hydrolysable polysaccharides and Folin-reactive compounds (proteins, polyphenols) released by the structure-providing lignocellulose material appear to have controlled both the intensity and the length of the maturation phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369417
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effects of Cyprinus carpio on Potamogeton pectinatus in experimental culture: the incidence of the periphyton (1999)
    Springer
    Hydrobiologia 415 (1999), S. 13-19 
    Details
    ISSN: 1573-5117
    Keywords: common carp ; sago pondweed ; epiphyton ; light attenuation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of one-year-old common carp (Cyprinus carpio L.) on plants and seedlings of Potamogeton pectinatus L., and on periphyton development was studied in 100 l glass aquaria. Two 30-day experiments were conducted using a muddy sediment or a pebbly bottom. In both cases, three treatments based on different fish size (two fish/aquarium) were assayed. The control had no fish. In both experiments, chlorophyll content of the periphyton increased from the beginning to the end of the period, for the three fish treatments. Light attenuation by periphyton was high, with final values 12-30% higher than in the control. Periphytic communities acclimated to reduced light conditions when the bottom was muddy. It can be concluded that, in muddy conditions, small carp affected plant growth by shade stress, which is achieved by a combination of increase in turbidity and the developing of a leaf periphytic cover. Under pebbly conditions, plant damage was caused by collisions and the growth of epiphytic algae. Medium and large fish consumed plants in both experiments. Seedlings were affected by herbivory in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003843502984
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Propagule bank and plant emergence of macrophytes in artificial channels of a temperate irrigation area in Argentina (1999)
    Springer
    Hydrobiologia 415 (1999), S. 1-5 
    Details
    ISSN: 1573-5117
    Keywords: submerged plants ; macrophytes ; propagule bank ; irrigation and drainage channels ; south America ; aquatic weeds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The irrigation district of the lower valley of Río Colorado (62° 37′ W, 39° 23′ S) was examined during 1995 and 1996 to evaluate propagule bank abundance and regeneration in five irrigation and five drainage channel sites. Six 15 cm deep cores from each site were collected in late winter and sectioned into two subsamples. One was sieved to identify taxa and propagule density and the other was placed under controlled laboratory conditions to record emergence over 90 days. Mean propagule density of Potamogeton pectinatus (260 tubers. m-2, 173 rhizome nodes. m-2 and 246 seeds. m-2) and Zannichellia palustris (968 seeds. m-2) was higher in irrigation than in drainage channels. By contrast, higher values in drainage channels were recorded for Ruppia maritima (4352 seeds. m-2) and Chara contraria (35633 oospores. m-2). Plant emergence in P. pectinatus was independent of channel type. Higher and lower values were registered in irrigation channels for Z. palustris and the other two species, respectively. Plant emergence in relation to propagule density for all the species ranged from 24% to 56%, and no differences were found between irrigation and drainage channels. Results are discussed in relation to the established vegetation and the different management and environmental conditions of both types of channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003808713907
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...