نتایج جستجو برای: using kufi

تعداد نتایج: 3387856  

2017
Xiaolin Hou Sitong Liu Ying Feng

Anammox is a cost-effective process to treat nitrogenous wastewater. In this work, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize the intracellular and extracellular substances of anammox sludge during reactor operation of 276 days. Four main fluorophores were identified from the intracellular substances. Two main protein-like fluorophores were identified fr...

Journal: :SIAM J. Comput. 2000
Itsik Pe'er Ron Shamir Roded Sharan

Perfect phylogeny is one of the fundamental models for studying evolution. We investigate the following variant of the problem: The input is an n ×m species-characters matrix. The characters are binary and directed, i.e., a species can only gain characters. The difference from standard perfect phylogeny is that for some species the state of some characters is unknown. The question is whether on...

2009
G. Kohler

Introduction In electron beam therapy bolus is often used to conform as closely as possible to the target volume while avoiding critical structures in the depth. In most cases a flexible bolus can cover the skin without air gap. However, under certain conditions it is difficult –or even not possible– to avoid air gaps between bolus and patient without reducing treatment quality. In a special cl...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2006
S Kalyuzhnyi M Gladchenko A Mulder B Versprille

This paper reports on successful laboratory testing of a new nitrogen removal process called DEAMOX (DEnitrifying AMmonium OXidation) for the treatment of strong nitrogenous wastewater such as baker's yeast effluent. The concept of this process combines the recently discovered ANAMMOX (ANaerobic AMMonium OXidation) reaction with autotrophic denitrifying conditions using sulfide as an electron d...

Journal: :Obesity facts 2009
Christine Stroh Joachim Bottger Frank Meyer Hans Lippert Thomas Manger

We report 2 patients who developed sarcoidosis after the implantation of adjustable silicone gastric banding (GB) in Germany. Before implantation, no pulmonary diseases were evident in the medical history of either patient. The 1st patient suffered sarcoidosis 12 months after GB. He has been treated at a hospital specialising in pulmonary diseases. Because of the treatment with corticoids, the ...

2005
L. Vigilant

L. Vigilant et al. (1) recently presented "the strongest support yet for the placement of [their] common mtDNA [mitochondrial DNA] ancestor in Africa some 200,000 years ago." This support stems from a tree estimated by maximum parsimony from mtDNA sequence data with the use of the computer program PAUP (2). The African origin is inferred from this tree because (i) the most basal splits are amon...

Journal: :Environmental technology 2014
M Salatul Islam Mozumder Cristian Picioreanu Mark C M van Loosdrecht Eveline I P Volcke

This study deals with the influence of heterotrophic growth on autotrophic nitrogen removal from wastewater in a granular sludge reactor. A mathematical model was set-up including autotrophic and heterotrophic growth and decay in the granules from a partial nitritation-anammox process. A distinction between heterotrophic bacteria was made based on the electron acceptor (dissolved oxygen, nitrit...

2009
Gang Chen Kamal Tawfiq

One of the challenges to be confronted during landfill operations is to handle the landfill leachate with high ammonium content. Current biological ammonium removal processes either are complicated and hard to manage, or require major investments. Low cost and low maintenance onsite systems for the treatment of landfill leachate with high ammonium content are in urgent need, especially for land...

2015
Alejandro Gonzalez-Martinez Alejandro Rodriguez-Sanchez Belén Rodelas Ben A. Abbas Maria Victoria Martinez-Toledo Mark C. M. van Loosdrecht F. Osorio Jesus Gonzalez-Lopez

Identification of anaerobic ammonium oxidizing (anammox) bacteria by molecular tools aimed at the evaluation of bacterial diversity in autotrophic nitrogen removal systems is limited by the difficulty to design universal primers for the Bacteria domain able to amplify the anammox 16S rRNA genes. A metagenomic analysis (pyrosequencing) of total bacterial diversity including anammox population in...

2015
Tim Kalvelage Gaute Lavik Marlene M. Jensen Niels Peter Revsbech Carolin Löscher Harald Schunck Dhwani K. Desai Helena Hauss Rainer Kiko Moritz Holtappels Julie LaRoche Ruth A. Schmitz Michelle I. Graco Marcel M. M. Kuypers Zhe-Xue Quan

Oxygen minimum zones are major sites of fixed nitrogen loss in the ocean. Recent studies have highlighted the importance of anaerobic ammonium oxidation, anammox, in pelagic nitrogen removal. Sources of ammonium for the anammox reaction, however, remain controversial, as heterotrophic denitrification and alternative anaerobic pathways of organic matter remineralization cannot account for the am...

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