Jennifer Schalk

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From recent research it has become clear that at least two different possibilities for anaerobic ammonium oxidation exist in nature. 'Aerobic' ammonium oxidizers like Nitrosomonas eutropha were observed to reduce nitrite or nitrogen dioxide with hydroxylamine or ammonium as electron donor under anoxic conditions. The maximum rate for anaerobic ammonium(More)
Hydrazine is rarely found as an intermediate in microbial nitrogen conversions. In this study the conversion of hydrazine by the anaerobic ammonium oxidation (Anammox) culture, in which hydrazine has been proposed as an intermediate, was investigated. This study demonstrated the biological nature of hydrazine conversion by the Anammox culture. In batch(More)
Nitrous oxide (N2O), a greenhouse gas, is emitted during autotrophic and heterotrophic ammonia oxidation. This emission may result from either coupling to aerobic denitrification, or it may be formed in the oxidation of hydroxylamine (NH2OH) to nitrite (NO2 −). Therefore, the N2O production during NH2OH oxidation was studied with Alcaligenes faecalis strain(More)
The aim of the present study was to identify non-parenchymal liver cells (NPLC) in B10.D2 mice and to determine their percentage frequency. The isolation of NPLC was carried out using the collagenase/pronase technique. Using functional techniques (latex phagocytosis, immunocytochemical detection of surface-bound and intracytoplasmic antigens) and(More)
A sex pheromone produced by female banded cucumber beetle adults,Diabrotica balteata LeConte, was isolated from volatiles trapped on Porapak Q and identified as 6,12-dimethylpentadecan-2-one. The structure was elucidated by spectroscopic analyses and confirmed by synthesis. The synthesized racemic compound was equal to the purified natural pheromone in(More)
The mechanism of cell replacement of non-parenchymal liver cells (NPLC) was investigated in an attempt to answer the question: to what extend are NPLC replaced by proliferation of local resident cells and to what extend by cells originating from the bone-marrow. The bone-marrow of mice was used, and H2k positive cells from F1 (B10.BR X B10.D2) hybrid mice(More)
An extensive collection of 1527 clones ofS. tuberosum subsp.andigena was screened in 1973 in unreplicated plots to test for resistance to the Colorado potato beetle and potato leafhopper. All clones were susceptible to the beetle. Of 17 clones selected in the 1973 tests for resistance to the potato leafhopper, 7 selections were significantly more resistant(More)
In this study a novel hydroxylamine oxidoreductase (HAO) was purified and characterized from an anaerobic ammonium-oxidizing (Anammox) enrichment culture. The enzyme, which constituted about 9% of the protein mass in the soluble fraction of the cell extract, was able to oxidize hydroxylamine and hydrazine. When phenazine methosulfate and(More)
EXAMINATION OF FACTORS AFFECTING THE FREQUENCY,<lb>RESPONSE TIME, AND CLEARANCE TIME OF INCIDENTS ON<lb>FREEWAYS<lb>by<lb>INDRAJIT GHOSH<lb>December 2010 Advisor: Dr. Peter Tarmo Savolainen<lb>Major: Civil Engineering (Transportation)<lb>Degree: Doctor of Philosophy Traffic incidents are the primary cause of non-recurrent congestion in urban<lb>areas,(More)
s of papers CENTRAL HYPOTENSIVE ACTIVITY OF KETANSERIN IN CATS H.W.G.H. Boddeke, H.N. Doods and P.A. van Zwieten Ketanserin, a 5HT2and ~ -antagonist, elicits antihypertensiva activity in humans and in animal models. However, not all details of the mechanism underlying this antihypertensive effect are clearly understood. In the present study the possibility(More)