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PubMed Journals Articles About "Iron Limitation Effects Nitrogen Fixing Organisms With Possible" RSS

08:46 EST 15th December 2018 | BioPortfolio

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Showing "Iron limitation effects nitrogen fixing organisms with possible" PubMed Articles 1–25 of 28,000+

Nutrient-limited conditions determine the responses of foliar nitrogen and phosphorus stoichiometry to nitrogen addition: A global meta-analysis.

To test the hypothesis that nutrient-limited conditions can determine the responses of nitrogen (N) and phosphorus (P) stoichiometry to N addition, a meta-analysis was conducted to identify the different responses of foliar N and P concentrations and N-to-P ratios to N addition under N limitation, N and P co-limitation and P limitation. N addition increased the foliar N-to-P ratios and N concentrations by 46.2% and 30.2%, respectively, under N limitation, by 18.7% and 19.7% under N and P co-limitation, and ...


Genomic Manipulations of the Diazotroph Azotobacter vinelandii.

The biological reduction of nitrogen gas to ammonia is limited to a select group of nitrogen-fixing prokaryotes. While nitrogenase is the catalyst of nitrogen fixation in these biological systems, a consortium of additional gene products is required for the synthesis, activation, and catalytic competency of this oxygen-sensitive metalloenzyme. Thus, the biochemical complexity of this process often requires functional studies and isolation of gene products from the native nitrogen-fixing organisms. The stric...

Detrimental effects of rhizobial inoculum early in the life of partridge pea, Chamaecrista fasciculata.

Mutualistic relationships with microbes may aid plants in overcoming environmental stressors and increase the range of abiotic environments where plants can persist. Rhizobia, nitrogen-fixing bacteria associated with legumes, often confer fitness benefits to their host plants by increasing access to nitrogen in nitrogen-limited soils, but effects of rhizobia on host fitness under other stresses, such as drought, remain unclear.


A quantitative model of nitrogen fixation in the presence of ammonium.

Nitrogen fixation provides bioavailable nitrogen, supporting global ecosystems and influencing global cycles of other elements. It provides an additional source of nitrogen to organisms at a cost of lower growth efficiency, largely due to respiratory control of intra-cellular oxygen. Nitrogen-fixing bacteria can, however, utilize both dinitrogen gas and fixed nitrogen, decreasing energetic costs. Here we present an idealized metabolic model of the heterotrophic nitrogen fixer Azotobacter vinelandii which, c...

Distribution of cyanobacteria and their interactions with pesticides in paddy field: A comprehensive review.

Cyanobacteria, also known as blue green algae are one of the important ubiquitous oxygen evolving photosynthetic prokaryotes and ultimate source of nitrogen for paddy fields since decades. In past two decades, indiscriminated use of pesticides led to biomagnification that intensively harm the structure and soil functions of soil microbes including cyanobacteria. Cyanobacterial abundance biomass, short generation, water holding capacity, mineralizing capacity and more importantly nitrogen fixing have enormou...

Effect of nitrogen limitation on biochemical composition and photosynthetic performance for fed-batch mixotrophic cultivation of microalga Spirulina platensis.

In this study, the effect of nitrogen limitation on microalgal growth, biochemical composition and photosynthetic performance was investigated in fed-batch mixotrophic cultivation of microalga Spirulina platensis, compared with that in autotrophic cultivation. The microalgal biomass productivity was greatly enhanced by mixotrophic cultivation. With nitrogen limitation, the mixotrophic culture accelerated the degradation of microalgal pigments and proteins to supply intracellular nitrogen for maintaining hig...

Synergistic effects of nitrogen and potassium on quantitative limitations to photosynthesis in rice (Oryza sativa L.).

Inhibition of net CO2 assimilation (A) during photosynthesis is one of the major physiological effects of both nitrogen (N) and potassium (K) deficiency on the growth of rice. Whether the reduction of A arises from the limitation either to the diffusion and biochemical fixation of CO2 or to the photochemical energy conversion is still debated for the deficiency of N and K. In this study, gas exchange parameters of rice under different N and K levels were evaluated and the limitations to the capture process ...

Changes in the abundance and community composition of different nitrogen cycling groups in response to fumigation with 1,3-dichloropropene.

The fumigant 1,3-dichloropropene (1,3-D) is widely-used to control pathogenic bacteria, fungi, nematodes and insects in soil before a crop is planted. Although fumigants in general have been reported to have a 'fertilizer effect' in the soil by increasing nitrogen availability, little is known of how a specific fumigant such as 1,3-D affects available nitrogen. This study used real-time quantitative PCR (qPCR) and 16S rRNA gene amplicon sequencing techniques to investigate the effects of 1,3-D on microorgan...

Elemental stoichiometry and photophysiology regulation of Synechococcus sp. PCC7002 under increasing severity of chronic iron limitation.

Iron (Fe) is an essential co-factor for many metabolic enzymes of photoautotrophs. Although Fe limits phytoplankton productivity in broad areas of the ocean, phytoplankton have adapted their metabolism and growth to survive in these conditions. Using the euryhaline cyanobacterium Synechococcus sp. PCC7002 we investigated the physiological responses to long-term acclimation to four levels of Fe availability representative of the contemporary ocean (36.7, 3.83, 0.47 and 0.047 pM Fe'). With increasing severi...

Uptake of bacteria into living plant cells, the unifying and distinct feature of the nitrogen-fixing root nodule symbiosis.

Despite the presence of complex microbiota on the surfaces of all plants, the uptake of bacteria into plant cells and the subsequent accommodation in a membrane-enclosed compartment is restricted to the nitrogen-fixing root nodule and the Gunnera-Nostoc symbiosis. The plant cell wall and the outward-directed turgor pressure are major constraints for bacterial uptake because localised lysis of the cell wall endangers the integrity of the protoplast. Host cell integrity is consistently maintained by turgescen...

Impact of Iron-enriched Aspergillus oryzae on Iron Bioavailability, Safety and Gut Microbiota in Rats.

Iron deficiency is a leading global nutritional problem. Ferrous sulfate (FeSO4) is the most common iron source used for supplementation. Because of many side effects associated with its consumption, it is important to identify new forms of iron.

Start-up and Operation of Biofilter Coupled Nitrification and CANON for the Removal of Iron, Manganese and Ammonia Nitrogen.

A pilot-scale bio-filter coupled nitrification and CANON was started up to remove iron, manganese and ammonia nitrogen from groundwater in a plant, and the main removal route of ammonia nitrogen was analyzed. The experiment showed that the bio-filter could be started up successfully and achieved stable operation after 164 days of culture development. The value of △NH-N/△NO-N was 1.49, and the oxidation and removal of Fe(Ⅱ), Mn(Ⅱ), and NH-N were (9.87±1.17), (2.25±0.06), and (1.51±0.06) mg·L, res...

Activated Sludge Mineralization and Solutions in the Process of Zero-Valent Iron Autotrophic Denitrification.

We studied the inoculation of activated sludge from domestic sewage treatment plants. The reaction of reducing nitrate by zero-valent iron was started in the up-flow anaerobic reactor. After 52 d of operation, a nitrogen removal rate of 29.3 g·(m·d) was achieved. Ferric iron and iron oxide coated on the sludge formed in the operation process caused the mineralization and slowly decreased the sludge activity. The methods of the "supplement and replacement of the sludge in the reactor" and "changing the ref...

Novel triadius-like N specie of iron nitride compounds under high pressure.

Various nitrogen species in nitrides are fascinating since they often appear with these nitride as superconductors, hard materials, and high-energy density. As a typical complex, though iron nitride has been intensively studied, nitrogen species in the iron-nitrogen (Fe-N) compounds only have been confined to single atom (N) or molecule nitrogen (N). Using a structure search method based on the CALYPSO methodology, unexpectedly, we here revealed two new stable high pressure (HP) states at 1:2 and 1:4 compos...

Methods for Generating Microbial Cocultures that Grow in the Absence of Fixed Carbon or Nitrogen.

This work is motivated by both (1) the desire to make interesting products without the reliance on fixed carbon or fixed nitrogen using microbial cocultures, and (2) the desire to develop new methods for growing microbial communities. The bioplastic polyhydroxybutyrate (PHB), for example, is considered prohibitively expensive to make from sugar (compared to polypropylene). Utilizing and building on engineered strains of Synechococcus elongatus and Azotobacter vinelandii, we have combined a nitrogen-fixing o...

Effects of Nanoscale Zero-valent Iron (nZVI) on Denitrifying Performance of an Upflow Granular Sludge Bed Reactor.

In order to examine the effects of nanoscale zero-valent iron (nZVI) on the performance of denitrifying granular sludge (DGS) in a continuous flow model, the variations of nitrogen removal efficiency in the reactor, sludge morphology, and denitrifying characteristics at different influent nZVI concentrations were investigated in an upflow sludge bed (USB). The results showed that nZVI concentrations lower than 5 mg·L did not influence the nitrogen removal performance of the reactor significantly, and the a...

Short-term nitrate limitation prior to harvest improves phenolic compound accumulation in hydroponic-cultivated lettuce (Lactuca sativa L.) without reducing shoot fresh weight.

Long-term exposure to a low nitrogen supply could effectively improve phenolic content in vegetables, but it also greatly decreases the yield. Therefore, it is necessary to develop cost-effective strategies of nitrogen management to overcome these obstacles. Here, we found that decreasing the nitrogen (NO3-) supply from 8.0 to below 2.0 mM during the last seven days before harvest significantly increased phenolic levels and antioxidant capacity of the soluble fraction in two hydroponic-cultivated lettuces, ...

Carbon/Nitrogen Metabolic Balance: Lessons from Cyanobacteria.

Carbon and nitrogen are the two most abundant nutrient elements for all living organisms, and their metabolism is tightly coupled. What are the signaling mechanisms that cells use to sense and control the carbon/nitrogen (C/N) metabolic balance following environmental changes? Based on studies in cyanobacteria, it was found that 2-phosphoglycolate derived from the oxygenase activity of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) and 2-oxoglutarate from the Krebs cycle act as the carbon- and ni...

Smoking-induced Iron Dysregulation in the Lung.

Iron is one of the most abundant transition elements and is indispensable for almost all organisms. While the ability of iron to participate in redox chemistry is an essential requirement for participation in a range of vital enzymatic reactions, this same feature of iron also makes it dangerous in the generation of hydroxyl radicals and superoxide anions. Given the high local oxygen tensions in the lung, the regulation of iron acquisition, utilization, and storage therefore becomes vitally important, perha...

The Zn2Cys6-type transcription factor LeuB cross-links regulation of leucine biosynthesis and iron acquisition in Aspergillus fumigatus.

Both branched-chain amino acids (BCAA) and iron are essential nutrients for eukaryotic cells. Previously, the Zn2Cys6-type transcription factor Leu3/LeuB was shown to play a crucial role in regulation of BCAA biosynthesis and nitrogen metabolism in Saccharomyces cerevisiae and Aspergillus nidulans. In this study, we found that the A. fumigatus homolog LeuB is involved in regulation of not only BCAA biosynthesis and nitrogen metabolism but also iron acquisition including siderophore metabolism. Lack of LeuB ...

Proteomic analysis dissects the impact of nodulation and biological nitrogen fixation on Vicia faba root nodule physiology.

Symbiotic nitrogen fixation in root nodules of legumes is a highly important biological process which is only poorly understood. Root nodule metabolism differs from that of roots. Differences in root and nodule metabolism are expressed by altered protein abundances and amenable to quantitative proteome analyses. Differences in the proteomes may either be tissue specific and related to the presence of temporary endosymbionts (the bacteroids) or related to nitrogen fixation activity. An experimental setup inc...

Synthesis of an iron-nitrogen co-doped ordered mesoporous carbon-silicon nanocomposite as an enhanced electrochemical sensor for sensitive and selective determination of chloramphenicol.

In this study, we developed a sensitive electrochemical sensor for the detection of chloramphenicol (CAP). An iron-nitrogen co-doped ordered mesoporous carbon-silicon nanocomposite (Si-Fe/NOMC) was prepared as follows. First, an SBA-15 surface was treated with an iron and nitrogen co-doped carbon framework obtained from the polymerization of ethylenediamine and carbon tetrachloride via the hard templating method. The mixture was then carbonized at a high temperature (900℃). Finally, the Si-Fe/NOMC modifie...

Engineering synergetic CO-fixing pathways for malate production.

Increasing the microbial CO-fixing efficiency often requires supplying sufficient ATP and redirecting carbon flux for the production of metabolites. However, addressing these two issues concurrently remains a challenge. Here, we present a combinational strategy based on a synergetic CO-fixing pathway that combines an ATP-generating carboxylation reaction in the central metabolic pathway with the ATP-consuming RuBisCO shunt in the carbon fixation pathway. This strategy provides enough ATP to improve the effi...

The path of electron transfer to nitrogenase in a phototrophic alpha-proteobacterium.

The phototrophic alpha-proteobacterium, Rhodopseudomonas palustris, is a model for studies of regulatory and physiological parameters that control the activity of nitrogenase. This enzyme produces the energy-rich compound H , in addition to converting N gas to NH . Nitrogenase is an ATP-requiring enzyme that uses large amounts of reducing power, but the electron transfer pathway to nitrogenase in R. palustris was incompletely known. Here we show that the ferredoxin, Fer1, is the primary but not sole electro...

The enhancement of iron fuel cell on bio-cathode denitrification and its mechanism as well as the microbial community analysis of bio-cathode.

To address the issue of insufficient electrons during denitrification, an iron fuel cell (IFC) bioreactor using iron as abiotic anode was designed. The nitrogen removal efficiency (NRE) of IFC (2.54 ± 0.016%) was significantly lower than microbial fuel cell (MFC) (32.58 ± 0.033%) with same bio-cathode under autotrophic conditions, which was due to the permeation of acetate on proton exchange membrane (PEM) affected the process of enriching autotrophic denitrifying bacteria by MFC. When used in het...


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