نتایج جستجو برای: aob

تعداد نتایج: 627  

2018
Hui He Yu Zhen Tiezhu Mi Lulu Fu Zhigang Yu

Ammonia oxidation plays a significant role in the nitrogen cycle in marine sediments. Ammonia-oxidizing archaea (AOA) and bacteria (AOB) are the key contributors to ammonia oxidation, and their relative contribution to this process is one of the most important issues related to the nitrogen cycle in the ocean. In this study, the differential contributions of AOA and AOB to ammonia oxidation in ...

Journal: :Asia Pacific journal of clinical nutrition 2007
Yu Zhang Ying Zhang

This paper investigated the efficiency of antioxidant of bamboo leaves (AOB) and extract of green tea (EGT) on the reduction of acrylamide in fried bread sticks and summarized the optimal levels of two additives. Seven experimental groups including a control group were organized for both of additives. Fried bread sticks were made via traditional processing technology. The flour was mixed with d...

2012
Eduardo Martín-López Rebeca Corona Laura López-Mascaraque

Olfaction is the most relevant chemosensory sense of the rodents. General odors are primarily detected by the main olfactory system while most pheromonal signals are received by the accessory olfactory system. The first relay in the brain occurs in the olfactory bulb, which is subdivided in the main and accessory olfactory bulb (MOB/AOB). Given that the cell generation time is different between...

2015
Kanako Tago Takashi Okubo Yumi Shimomura Yoshitomo Kikuchi Tomoyuki Hori Atsushi Nagayama Masahito Hayatsu

The effects of environmental factors such as pH and nutrient content on the ecology of ammonia-oxidizing bacteria (AOB) and archaea (AOA) in soil has been extensively studied using experimental fields. However, how these environmental factors intricately influence the community structure of AOB and AOA in soil from farmers' fields is unclear. In the present study, the abundance and diversity of...

Journal: :Water research 2016
Cristian Picioreanu Julio Pérez Mark C M van Loosdrecht

A three-dimensional (3-D) diffusion-reaction model was used to assess the effects of nitrifiers growing in cell clusters on the apparent oxygen half-saturation coefficients in activated sludge flocs. The model allows conciliation of seemingly contradictory reports by several research groups. Although intrinsic half-saturation coefficients (i.e., not affected by diffusion) show a better affinity...

Journal: :Frontiers in microbiology 2015
Haoxin Fan Henk Bolhuis Lucas J. Stal

The first step of nitrification, the oxidation of ammonia to nitrite, can be performed by ammonia-oxidizing archaea (AOA) or ammonium-oxidizing bacteria (AOB). We investigated the presence of these two groups in three structurally different types of coastal microbial mats that develop along the tidal gradient on the North Sea beach of the Dutch barrier island Schiermonnikoog. The abundance and ...

2004
Karen M. Carney Pamela A. Matson Brendan J. M. Bohannan

Karen M. Carney,* Pamela A. Matson and Brendan J. M. Bohannan Smithsonian Environmental Research Center, P.O. Box 28, Edgewater, MD 21037, USA Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA *Correspondence: E-mail: [email protected] Abstract Ammonia-oxidizing bact...

2015
Anna E. Sterngren Sara Hallin Per Bengtson

Both ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) play an important role in nitrification in terrestrial environments. Most often AOA outnumber AOB, but the relative contribution of AOA and AOB to nitrification rates remains unclear. The aim of this experiment was to test the hypotheses that high nitrogen availability would favor AOB and result in high gross nitrificatio...

2015
Mariana P. Reis Marcelo P. Ávila Rosalinde M. Keijzer Francisco A. R. Barbosa Edmar Chartone-Souza Andréa M. A. Nascimento Hendrikus J. Laanbroek

Ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) are a diverse and functionally important group in the nitrogen cycle. Nevertheless, AOA and AOB communities driving this process remain uncharacterized in tropical freshwater sediment. Here, the effect of human settlement on the AOA and AOB diversity and abundance have been assessed by phylogenetic and quantitative PCR analyse...

Journal: :African health sciences 2012
I N Ize-Iyamu M C Isiekwe

BACKGROUND Anterior open bite is said to exist when there is an actual vertical gap between the upper and lower incisors with the teeth in centric occlusion. This could occur in the anterior or posterior region, and may be attributed to the supra eruption of the posterior teeth or the infra eruption of the anterior teeth and it is common in both adults and children. OBJECTIVE To evaluate the ...

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