نتایج جستجو برای: nitrate nitrogen content

تعداد نتایج: 546641  

ژورنال: سلامت و محیط زیست 2019

Background and Objective: Nitrate is one of the most important factors in determining the quality of vegetables. Today, due to the excessive use of nitrogen fertilizers to accelerate vegetative growth, many vegetables have a high percentage of nitrates in human diet. The purpose of this study was to investigate the concentration of nitrate in four vegetable species cultivated in Poldokhtar and ...

Journal: :Journal of environmental biology 2012
Valsa Remony Manoj Namasivayam Vasudevan

Ideal bacterial support medium for fixed film denitrification processes/bioreactors must be inexpensive, durable and possess large surface area with sufficient porosity. The present study has been focussed on removing nitrate nitrogen at two different nitrate nitrogen loading rates (60 (NLR I) and 120 (NLR II) mg l(-1)) from simulated aquaculture wastewater. Coconut coir fibre and a commerciall...

2017
Andreas Pfannmüller Jana M. Boysen Bettina Tudzynski

Secondary metabolite production of the phytopathogenic ascomycete fungus Fusarium fujikuroi is greatly influenced by the availability of nitrogen. While favored nitrogen sources such as glutamine and ammonium are used preferentially, the uptake and utilization of nitrate is subject to a regulatory mechanism called nitrogen metabolite repression (NMR). In Aspergillus nidulans, the transcriptiona...

Journal: :Microbiology 2007
Javier Espinosa Karl Forchhammer Asunción Contreras

The Synechococcus sp. PCC 7942 nitrogen regulator PipX interacts in a 2-oxoglutarate-dependent manner with the global nitrogen transcription factor NtcA and the signal transduction protein P(II). In vivo, PipX is involved in the NtcA-dependent induction of glnB and glnN genes. To further investigate the extent to which PipX is involved in global nitrogen control, the effect of pipX inactivation...

Journal: :Plant physiology 2015
Xue He Baoyuan Qu Wenjing Li Xueqiang Zhao Wan Teng Wenying Ma Yongzhe Ren Bin Li Zhensheng Li Yiping Tong

Nitrate is a major nitrogen resource for cereal crops; thus, understanding nitrate signaling in cereal crops is valuable for engineering crops with improved nitrogen use efficiency. Although several regulators have been identified in nitrate sensing and signaling in Arabidopsis (Arabidopsis thaliana), the equivalent information in cereals is missing. Here, we isolated a nitrate-inducible and ce...

2015
Hong Wang Jian-en Gao Xing-hua Li Shao-long Zhang Hong-jie Wang Jonathan A Coles

To evaluate the process of nitrate accumulation and leaching in surface and ground water, we conducted simulated rainfall experiments. The experiments were performed in areas of 5.3 m2 with bare slopes of 3° that were treated with two nitrogen fertilizer inputs, high (22.5 g/m2 NH4NO3) and control (no fertilizer), and subjected to 2 hours of rainfall, with. From the 1st to the 7th experiments, ...

2013
F. Castillo F. J. Caballero J. Cárdenas

Rhodopseudomonas capsulata bacteria photo-assimilated nitrate under anaerobic condi­ tions, but were incapable of reducing it in the dark. The bacteria utilized dissolved N 2 as nitrogen source, but the growth in the presence of nitrate was 5-fold higher. Nitrite was excreted to the medium, but not stoichiometrically with respect to nitrate consumption. Nitrate reductase is particulate and used...

Journal: :تولید گیاهان زراعی 0
احمد نوش کام دانشجوی دکتری زراعت دانشگاه تهران حسن مومیوند دانشجوی دکتری باغبانی دانشگاه تهران امیر محسنی دانشجوی سابق کارشناسی ارشد خاک شناسی دانشگاه تهران مصباح بابالار استاد دانشگاه تهران

for finding out the effect of nitrogen and calcium carbonate fertilizers on nitrate and nitrogen accumulation in aboveground biomass, calcium concentration and dry weight of leaves of satureja hortensis l., a factorial experiment was carried out based on randomized complete block design with three replications in karaj in 2008. the nitrogen fertilizer was in four levels (0, 50, 100 and 150 kg. ...

2012
Nidhi Gupta Atul K. Gupta Vikram S. Gaur Anil Kumar

Nitrogen responsiveness of three-finger millet genotypes (differing in their seed coat colour) PRM-1 (brown), PRM-701 (golden), and PRM-801 (white) grown under different nitrogen doses was determined by analyzing the growth, yield parameters and activities of nitrate reductase (NR), glutamine synthetase (GS), glutamate synthase; GOGAT, and glutamate dehydrogenase (GDH) at different developmenta...

Journal: :Journal of bacteriology 1998
M M Nakano T Hoffmann Y Zhu D Jahn

The nitrate and nitrite reductases of Bacillus subtilis have two different physiological functions. Under conditions of nitrogen limitation, these enzymes catalyze the reduction of nitrate via nitrite to ammonia for the anabolic incorporation of nitrogen into biomolecules. They also function catabolically in anaerobic respiration, which involves the use of nitrate and nitrite as terminal electr...

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