Library

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
    High energy electron disinfection of sewage wastewater in flow systems
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part C, 35 (1990), S. 440-444 
    Details
    ISSN: 1359-0197
    Keywords: Disinfection ; batch systems ; coliforms ; depth effect ; electron beam ; flow system ; flowrate effect ; wastewater
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1359-0197(90)90135-5
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    High density cultivation of plant cells in a new aeration-agitation type fermentor, maxblend fermentor(R)
    Amsterdam : Elsevier
    Journal of Fermentation and Bioengineering 75 (1993), S. 48-52 
    Details
    ISSN: 0922-338X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0922-338X(93)90177-A
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Urea decomposing activity of fractionated brackish phytoplankton in Lake Nakaumi (2000)
    Springer
    Limnology 1 (2000), S. 75-80 
    Details
    ISSN: 1439-863X
    Keywords: Key words Urea decomposition ; Size fraction ; Phytoplankton ; Lake Nakaumi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of brackish phytoplankton cell classes upon the response of urea decomposition was investigated in Lake Nakaumi. The urea decomposition rate was 5 to 350 μmol urea m−3 h−1 in the light and 3 to 137 μmol urea m−3 h−1 in the dark. The urea decomposition rates in the light were obviously higher than in the dark. An extremely high rate (350 μmol urea m−3 h−1) was observed in Yonago Bay. The rate in the smaller fraction (〈5 μm) exceeded that in the middle (5–25 μm) and larger fractions (〉25 μm). The chlorophyll- and photosynthesis-specific rates for urea decomposition in the light were 0.5 to 3.9 μmol urea mg chl.a −1 h−1 and 0.3 to 1.3 μmol urea mg photo.C−1. The specific urea decomposing activities were higher in the smaller fraction than in the other two fractions. The present results suggest that in brackish waters urea decomposition occurred with coupling to the standing crop and photosynthetic activity of phytoplankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s102010070013
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A pretreatment method for the determination of nitrate in brackish water and seawater based on the hydrazinium reduction technique (2000)
    Springer
    Limnology 1 (2000), S. 129-132 
    Details
    ISSN: 1439-863X
    Keywords: Key words Pretreatment method ; Hydrazinium reduction ; Nitrate determination ; Brackish water ; Sep-Pak C18 cartridge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hydrazinium reduction technique has so far been inapplicable to the determination of nitrate in brackish water and seawater due to interference from magnesium ions. We developed a pretreatment method for brackish water and seawater samples for the determination of nitrate based on the hydrazinium reduction technique. Magnesium ions in water samples were converted to a precipitate of a complex with oxine (8-quinolinol) at pH 9.5, and then the precipitate was centrifuged at 3000 rpm for 20 min. The extra oxine in the resulting sample (the supernatant liquid), which inhibits the reduction of nitrate to nitrite, was removed using a Sep-Pak C18 cartridge. Thus we achieved the preparation of a magnesium-free water sample. Using the hydrazinium reduction technique with the proposed pretreatment method, nitrate in brackish water and seawater as well as fresh water was quantitatively determined with high accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s102010070018
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Diel variation in urea decomposing activity in the euphotic zone of brackish Lake Nakaumi (2000)
    Springer
    Limnology 1 (2000), S. 151-157 
    Details
    ISSN: 1439-863X
    Keywords: Key words Urea decomposition ; Diel variation ; Lake Nakaumi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Diel variations in urea decomposing activity in the euphotic zone of brackish Lake Nakaumi were measured under fixed light intensity. The decomposition rate of urea was 17 to 44 μ mol urea m−3 h−1 in the light and 10 to 27 μ mol urea m−3 h−1 in the dark. Higher decomposition rates were obtained in the upper euphotic zone. A clear diel periodicity in the urea decomposition rate was observed, with high rates from 1200 to 1600 and low rates from 0000 to 0400. Chlorophyll a specific decomposing activity ranged from 12 to 21 μg urea C mg chl.a −1 h−1 in the light and 7 to 13 μg urea C mg chl.a −1 h−1 in the dark. In the light, high values were obtained from 1600 to 2000 and low values from 0400 to 0800. The diel change in specific decomposing activity exhibited a similar pattern to that of the photosynthetic assimilation number, following the diel change in photosynthetic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s102010070001
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A simple and rapid visual method for the determination of ammonia nitrogen in environmental waters using thymol (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 467-469 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Simple visual and spectrophotometric methods for the determination of ammonia nitrogen in water are proposed, based on the color development of indothymol blue formed between ammonia and thymol. The color development was accelerated by nitroprusside to complete in 3 min. This color development is remarkably rapid compared with that of the other conventional methods with indothymol blue and indophenol blue. The concentration range of ammonia nitrogen spectrophotometrically determined was 0.04–1.2 mg/L NH4-N. The absorbance per 1 μg NH4-N was 0.0215 (molar absorptivity = 1.51 × 104) at 690 nm. The visual method not using any instrument as an in situ method in field works was developed based on the optimum conditions for the established spectrophotometric method. This visual method was successfully applied to the determination of ammonia nitrogen in environmental waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051642
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Significance of a halocline to nutrient cycles in shallow brackish Lake Nakanoumi, Japan (1987)
    Springer
    Hydrobiologia 146 (1987), S. 181-186 
    Details
    ISSN: 1573-5117
    Keywords: halocline ; nutrient cycle ; coastal lagoon ; land reclamation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The significance of a halocline for nutrient cycles in a shallow coastal lagoon, Lake Nakanoumi, was investigated. The study was made possible when the northern part of the lagoon was enclosed by polder dikes prior to land reclamation for agricultural purposes. The disappearance of the halocline allowed vertical mixing to extend to the whole depth and vertical gradients in water properties then decreased remarkably. Despite the disappearance of the halocline, dissolved oxygen content of bottom waters decreased considerably during summer months. Summer peaks in inorganic nitrogen and phosphate were still observed after disappearance of the halocline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008766
    Library Location Call Number Volume/Issue/Year 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...