نتایج جستجو برای: aob

تعداد نتایج: 627  

Journal: :Water research 2012
Atreyee Sims John Horton Shashikanth Gajaraj Steve McIntosh Randall J Miles Ryan Mueller Robert Reed Zhiqiang Hu

Ammonia-oxidizing organisms play an important role in wetland water purification and nitrogen cycling. We determined soil nitrification rates and investigated the seasonal and spatial distributions of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in three freshwater wetlands by using specific primers targeting the amoA genes of AOA and AOB and real-time quantitative polym...

2014
Vidya de Gannes Gaius Eudoxie William J. Hickey

Nitrification is a key process in soil nitrogen (N) dynamics, but relatively little is known about it in tropical soils. In this study, we examined soils from Trinidad to determine the edaphic drivers affecting nitrification levels and community structure of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) in non-managed soils. The soils were naturally vegetated, ranged in t...

2013
Wei Sun Chunyu Xia Meiying Xu Jun Guo Aijie Wang Guoping Sun

Ammonia-oxidizing archaea (AOA) and bacteria (AOB) play important roles in nitrification. However, limited information about the characteristics of AOA and AOB in the river ecosystem is available. The distribution and abundance of AOA and AOB in the sediments of the Dongjiang River, a drinking water source for Hong Kong, were investigated by clone library analysis and quantitative real-time PCR...

2015
Andrea Ocampo-Parra Bibiana Escobar-Toro Valentina Sierra-Alzate Zulma Vanessa Rueda María Clara Lema

BACKGROUND Anterior open bite AOB is the most common malocclusion associated with speech disorders and the literature has shown that problems of occlusion involve all oral functions. AOB not only produce aesthetic and occlusal problems for the patient and modifies the union of the lips, tongue, teeth, palate, palatal rugae and oropharynx, and thus affecting the ability to communicate well with ...

2008
Su-Jin Jeong Nam-Yeul Lim Nam-Kyu Jang Soo-Jin-Nah Choi Jae-Kyu Kim Yong-Yeon Jeong Heoung-Keun Kang

We report the findings of a patient with an asymptomatic Arc of Buhler (AOB) aneurysm, which was successfully treated by transcatheter coil embolization. An abdominal CT and angiography revealed an intact pancreaticoduodenal artery arcade (PDAA) and an anomalous communication between the SMA and celiac axis, termed an AOB. An aneurysm was observed at the origin of the AOB and treated with a tra...

Journal: :Applied and environmental microbiology 2015
Jialin Li David B Nedwell Jessica Beddow Alex J Dumbrell Boyd A McKew Emma L Thorpe Corinne Whitby

Nitrification, mediated by ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA), is important in global nitrogen cycling. In estuaries where gradients of salinity and ammonia concentrations occur, there may be differential selections for ammonia-oxidizer populations. The aim of this study was to examine the activity, abundance, and diversity of AOA and AOB in surface oxic sedime...

Journal: :Applied and environmental microbiology 2004
Yutaka Okano Krassimira R Hristova Christian M Leutenegger Louise E Jackson R Ford Denison Binyam Gebreyesus David Lebauer Kate M Scow

Ammonium oxidation by autotrophic ammonia-oxidizing bacteria (AOB) is a key process in agricultural and natural ecosystems and has a large global impact. In the past, the ecology and physiology of AOB were not well understood because these organisms are notoriously difficult to culture. Recent applications of molecular techniques have advanced our knowledge of AOB, but the necessity of using PC...

2015
Shimin Lu Xingguo Liu Zhuojun Ma Qigen Liu Zongfan Wu Xianlei Zeng Xu Shi Zhaojun Gu

Pond aquaculture is the major freshwater aquaculture method in China. Ammonia-oxidizing communities inhabiting pond sediments play an important role in controlling culture water quality. However, the distribution and activities of ammonia-oxidizing microbial communities along sediment profiles are poorly understood in this specific environment. Vertical variations in the abundance, transcriptio...

2016
Manuel Delgado-Baquerizo Fernando T. Maestre David J. Eldridge Brajesh K. Singh

Soil ammonia oxidizing bacteria (AOB) and archaea (AOA) are responsible for nitrification in terrestrial ecosystems, and play important roles in ecosystem functioning by modulating the rates of N losses to ground water and the atmosphere. Vascular plants have been shown to modulate the abundance of AOA and AOB in drylands, the largest biome on Earth. Like plants, biotic and abiotic features suc...

2014
Catarina M. Magalhães Ana Machado Béatrice Frank-Fahle Charles K. Lee S. Craig Cary

The McMurdo Dry Valleys of Antarctica are considered to be one of the most physically and chemically extreme terrestrial environments on the Earth. However, little is known about the organisms involved in nitrogen transformations in these environments. In this study, we investigated the diversity and abundance of ammonia-oxidizing archaea (AOA) and bacteria (AOB) in four McMurdo Dry Valleys wit...

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