نتایج جستجو برای: microbial nitrogen

تعداد نتایج: 225216  

Journal: :The Science of the total environment 2014
Yuting Liang Huihui Zhao Xu Zhang Jizhong Zhou Guanghe Li

To compare the functional gene structure and diversity of microbial communities in saline-alkali and slightly acidic oil-contaminated sites, 40 soil samples were collected from two typical oil exploration sites in North and South China and analyzed with a comprehensive functional gene array (GeoChip 3.0). The overall microbial pattern was significantly different between the two sites, and a mor...

Journal: :Science 2010
Donald E Canfield Alexander N Glazer Paul G Falkowski

Atmospheric reactions and slow geological processes controlled Earth's earliest nitrogen cycle, and by ~2.7 billion years ago, a linked suite of microbial processes evolved to form the modern nitrogen cycle with robust natural feedbacks and controls. Over the past century, however, the development of new agricultural practices to satisfy a growing global demand for food has drastically disrupte...

Journal: :زیست شناسی خاک 0
آسیه عباسیان دانشجوی دکتری گروه خاکشناسی دانشکده کشاورزی دانشگاه بوعلی سینا همدان احمد گلچین استاد گروه خاکشناسی دانشکده کشاورزی دانشگاه زنجان محسن شکل آبادی استادیار گروه خاکشناسی دانشکده کشاورزی دانشگاه بوعلی سینا همدان

soil enzyme activities are considered as one of the most important biological indicators and reflect the soil quality and fertility. current study was conducted to investigate the relationship between urease, invertase, alkaline phosphatase and aryl sulphatase activities of two histosols (located in kerman and shahrekord provence) and some of the soil chemical and biological properties. soil sa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1387

boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...

2015
Andrew Dopheide Gavin Lear Zhili He Jizhong Zhou Gillian D. Lewis

We surveyed the functional gene composition and diversity of microbial biofilm communities in 18 New Zealand streams affected by different types of catchment land use, using a comprehensive functional gene array, GeoChip 3.0. A total of 5,371 nutrient cycling and energy metabolism genes within 65 gene families were detected among all samples (342 to 2,666 genes per stream). Carbon cycling genes...

2014
Jörg Schnecker Birgit Wild Florian Hofhansl Ricardo J. Eloy Alves Jiří Bárta Petr Čapek Lucia Fuchslueger Norman Gentsch Antje Gittel Georg Guggenberger Angelika Hofer Sandra Kienzl Anna Knoltsch Nikolay Lashchinskiy Robert Mikutta Hana Šantrůčková Olga Shibistova Mounir Takriti Tim Urich Georg Weltin Andreas Richter

Enzyme-mediated decomposition of soil organic matter (SOM) is controlled, amongst other factors, by organic matter properties and by the microbial decomposer community present. Since microbial community composition and SOM properties are often interrelated and both change with soil depth, the drivers of enzymatic decomposition are hard to dissect. We investigated soils from three regions in the...

2017
Yating He Minggang Xu Yuchun Qi Yunshe Dong Xinhua He Jianwei Li Xinchao Liu Liangjie Sun

Grazing and cultivation are two important management practices worldwide that can cause significant soil organic carbon (SOC) losses. However, it remains elusive how soil microbes have responded to soil carbon changes under these two practices. Based on a four-decade long field experiment, this study investigated the effects of grazing and cultivation on SOC stocks and microbial properties in t...

Journal: :The Journal of nutrition 1975
F G Hembry W H Pfander R L Preston

The utilization of nitrogen contained in soybean meal, casein, zein, and urea was studied in 12 mature wethers. Net microbial synthesis rates during the 6-hour period after feeding corresponded to ruminal ammonia concentrations, suggesting that the ruminal ammonia level in these experiments was a limiting factor in microbiol protein synthesis. Maximum conversion of dietary nitrogen to microbial...

2015
Jian-sheng Huang Ping Yang Chong-ming Li Yong Guo Bo Lai Ye Wang Li Feng Yun Zhang

In order to study the effect of nitrite and nitrate on the performance of microbial fuel cell, a system combining an anaerobic fluidized bed (AFB) and a microbial fuel cell (MFC) was employed for high-strength nitrogen-containing synthetic wastewater treatment. Before this study, the AFB-MFC had been used to treat high-strength organic wastewater for about one year in a continuous flow mode. Th...

2007
Robert L. Tate

Subsidence of the Everglades Histosols occurs at a rate of approximately 3 cm/year. The major cause of this loss of soil is the oxidation of the organic matter by the microbial community. One of the products of this microbial activity is inorganic nitrogen. Assuming an annual subsidence rate of 3 cm, approximately 1400 kg/ha of nitrogen is released per year. Much of this nitrogen accumulates in...

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