57 research outputs found
Short-term effects of de-inking paper sludge on the dynamics of soil carbon, nitrogen, and phenolic compounds
Applications of deinking paper sludge (DPS) decreased the establishment of some crops, indicating
that it may have inhibiting effects. The effects of soil-applied DPS on total carbon (C), nitrogen (N),
C:N ratio, and nitrate, ammonium, and phenolic compounds were studied for 2 years. The phytotoxicity
of simulated phenolic solutions of raw DPS and DPS-amended soil was investigated. Twelve phenolic
compounds were quantified in raw DPS. Vanillin and 3-hydroxy-4-methoxycinnamic acids increased
with DPS applications in amended soil for both years. Total soil C and the C:N ratio increased with
DPS applications, while nitrate soil content decreased. Germination indices were affected differently
by the phenolic compound solution that simulated DPS. This study highlights the lack of availability
of nitrate as the main factor involved in the inhibiting effect of DPS. However, other inhibiting effects
of phenolic compounds cannot be ruled out since they are known to inhibit nitrification and to trap
nitrate into organic N compounds
Isolation of free-living dinitrogen-fixing bacteria and their activity in compost containing de-inking paper sludge
Knowledge of the microbiology of dinitrogen (N2)-fixing bacteria in compost rich in de-inking paper sludge (DPS) is limited.
Dinitrogen (N2)-fixing bacteria from DPS composts were isolated and studied for their N2-fixing activity in vitro and in vivo.
Two Gram-negative N2-fixing isolates were identified as Pseudomonas. At 20 C, both isolates revealed that N2-fixing activity
was higher than that of three arctic Pseudomonas strains. Their N2-fixing activity was found to occur between 18 and 25 C, a pattern
that was similar to the reference isolate Azotobacter ATCC 7486. Composts successfully showed N2-fixing activity after carbohydrate
amendments both with and without inoculation of a N2-fixing isolate. These results suggest that DPS composts support
N2-fixing bacteria and that N2-fixing activity is dependent on a usable carbohydrate source.
2005 Elsevier Ltd. All rights reserved.Keywords: Dinitrogen-fixing bacteria; Compost; Paper sludge; Glucose; Pseudomonas balearica; Pseudomonas putid
Performance of the ATLAS electromagnetic calorimeter end-cap module 0
The construction and beam test results of the ATLAS electromagnetic end-cap calorimeter pre-production module 0 are presented. The stochastic term of the energy resolution is between 10% GeV^1/2 and 12.5% GeV^1/2 over the full pseudorapidity range. Position and angular resolutions are found to be in agreement with simulation. A global constant term of 0.6% is obtained in the pseudorapidity range 2.5 eta 3.2 (inner wheel)
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