Accedi

Bibliografie tematiche / Nitrogen Fixation

Indice

Articoli di riviste
Tesi
Libri
Capitoli di libri
Atti di convegni
Rapporti di organizzazioni

Letteratura scientifica selezionata sul tema "Nitrogen Fixation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Nitrogen Fixation".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Nitrogen Fixation"

1

Nagiev, T. M., N. I. Ali-zadeh, L. M. Gasanova, I. T. Nagieva, Ch A. Mustafaeva, N. N. Malikova, A. A. Abdullaeva e E. S. Bakhramov. "NITROGEN FIXATION AT CONJUGATED OXIDATION". Azerbaijan Chemical Journal, n. 2 (2018): 6–10. http://dx.doi.org/10.32737/0005-2531-2018-2-6-10.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

O'GARA, FERGAL. "Nitrogen Fixation". Biochemical Society Transactions 13, n. 3 (1 giugno 1985): 639. http://dx.doi.org/10.1042/bst0130639a.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Wen-Yue Hsiung. "Nitrogen Fixation". Forest Ecology and Management 10, n. 4 (maggio 1985): 348–50. http://dx.doi.org/10.1016/0378-1127(85)90127-6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Becker, James Y., e Shlomit Avraham (Tsarfaty). "Nitrogen fixation". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 280, n. 1 (febbraio 1990): 119–27. http://dx.doi.org/10.1016/0022-0728(90)87088-2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Becker, James Y., Shlomit Avraham (Tsarfaty) e Barry Posin. "Nitrogen fixation". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 230, n. 1-2 (agosto 1987): 143–53. http://dx.doi.org/10.1016/0022-0728(87)80138-9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Becker, James Y., e Barry Posin. "Nitrogen fixation". Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 250, n. 2 (agosto 1988): 385–97. http://dx.doi.org/10.1016/0022-0728(88)85178-7.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Davis, Lawrence C. "Fundamentals of nitrogen fixation an introduction to nitrogen fixation". Trends in Biochemical Sciences 12 (gennaio 1987): 451–52. http://dx.doi.org/10.1016/0968-0004(87)90216-7.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Smith, B. E. "Fertilizer fixation nitrogen fixation in plants". Trends in Biochemical Sciences 12 (gennaio 1987): 36. http://dx.doi.org/10.1016/0968-0004(87)90018-1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Sprent, J. I., e M. Alexander. "Biological Nitrogen Fixation." Journal of Applied Ecology 22, n. 2 (agosto 1985): 601. http://dx.doi.org/10.2307/2403193.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Mylona, Panagiota, Katharina Pawlowski e Ton Bisseling. "Symbiotic Nitrogen Fixation". Plant Cell 7, n. 7 (luglio 1995): 869. http://dx.doi.org/10.2307/3870043.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "Nitrogen Fixation"

1

Supeno. "Sonochemical fixation of nitrogen". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ57783.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Supeno, Carleton University Dissertation Chemistry. "Sonochemical fixation of nitrogen". Ottawa, 2000.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Klawonn, Isabell. "Marine nitrogen fixation : Cyanobacterial nitrogen fixation and the fate of new nitrogen in the Baltic Sea". Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-122080.

Testo completo

Abstract (sommario):

Biogeochemical processes in the marine biosphere are important in global element cycling and greatly influence the gas composition of the Earth’s atmosphere. The nitrogen cycle is a key component of marine biogeochemical cycles. Nitrogen is an essential constituent of living organisms, but bioavailable nitrogen is often short in supply thus limiting primary production. The largest input of nitrogen to the marine environment is by N2-fixation, the transformation of inert N2 gas into bioavailable ammonium by a distinct group of microbes. Hence, N2-fixation bypasses nitrogen limitation and stimulates productivity in oligotrophic regions of the marine biosphere. Extensive blooms of N2-fixing cyanobacteria occur regularly during summer in the Baltic Sea. N2-fixation during these blooms adds several hundred kilotons of new nitrogen into the Baltic Proper, which is similar in magnitude to the annual nitrogen load by riverine discharge and more than twice the atmospheric nitrogen deposition in this area. N2-fixing cyanobacteria are therefore a critical constituent of nitrogen cycling in the Baltic Sea. In this thesis N2 fixation of common cyanobacteria in the Baltic Sea and the direct fate of newly fixed nitrogen in otherwise nitrogen-impoverished waters were investigated. Initially, the commonly used 15N-stable isotope assay for N2-fixation measurements was evaluated and optimized in terms of reliability and practicality (Paper I), and later applied for N2-fixation assessments (Paper II–IV). N2 fixation in surface waters of the Baltic Sea was restricted to large filamentous heterocystous cyanobacteria (Aphanizomenon sp., Nodularia spumigena, Dolichospermum spp.) and absent in smaller filamentous cyanobacteria such as Pseudanabaena sp., and unicellular and colonial picocyanobacteria (Paper II-III). Most of the N2-fixation in the Northern Baltic Proper was contributed by Aphanizomenon sp. due to its high abundance throughout the summer and similar rates of specific N2-fixation as Dolichospermum spp. and N. spumigena. Specific N2 fixation was substantially higher near the coast than in an offshore region (Paper II). Half of the fixed nitrogen was released as ammonium at the site near the coast and taken up by non-N2-fixing organisms including phototrophic and heterotrophic, prokaryotic and eukaryotic planktonic organisms. Newly fixed nitrogen was thereby rapidly turned-over in the nitrogen-depleted waters (Paper III). In colonies of N. spumigena even the potential for a complete nitrogen cycle condensed to a microcosm of a few millimeters could be demonstrated (Paper IV). Cyanobacterial colonies can therefore be hot-spots of nitrogen transformation processes potentially including nitrogen gain, recycling and loss processes. In conclusion, blooms of cyanobacteria are instrumental for productivity and CO2 sequestration in the Baltic Sea. These findings advance our understanding of biogeochemical cycles and ecosystem functioning in relation to cyanobacterial blooms in the Baltic Sea with relevance for both ecosystem-based management in the Baltic Sea, and N2-fixation and nitrogen cycling in the global ocean.

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 2: Manuscript.

Gli stili APA, Harvard, Vancouver, ISO e altri

4

H, Boström Kjärstin. "Nitrogen fixation among marine bacterioplankton". Doctoral thesis, Högskolan i Kalmar, Naturvetenskapliga institutionen, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-24.

Testo completo

Abstract (sommario):

While bacterioplankton indisputably control vital biogeochemical paths in the cycling of carbon and nutrients in the world’s oceans, our knowledge about the functional and genetic diversity of bacterioplankton communities is negligible. In this thesis, molecular and more traditional microbiological methods were used to study the specific function of N2-fixation and in a general sense diversity of marine bacterioplankton species. Most oceans are nitrogen limited and, therefore, adaptive to bacterioplankton capable of N2-fixation. Recent studies have found nifH genes (coding for the nitrogenase enzyme) related to diverse heterotrophic bacteria in oceanic seawater samples indicating that, along with cyanobacteria, also heterotrophic bacteria benefit from N2-fixation. Here, molecular and cultivation methods were used to examine diazotrophic bacterioplankton in the Baltic Sea. We successfully isolated heterotrophic N2-fixing bacteria belonging to the γ-proteobacterial class by means of low-nitrogen plates and semi-solid diazotrophic medium tubes. The isolates required low-O2 conditions for N2-fixation. Using Real-time PCR it was found that heterotrophic bacterioplankton carrying the nifH gene was abundant (3 x 104 nifH gene copies L seawater-1) at locations in the Southwest Baltic proper. With the aim to identify the main N2-fixing organisms in Baltic Proper surface waters, a clone library of nifH gene transcripts (RNA) was generated. Clone inserts were exclusively related to Aphanizomenon sp. and Nodularia sp. Using quantitative real-time PCR it was found that the nifH gene expression from Nodularia sp. was highly variable between stations in the Baltic Proper but was 10-fold higher during mid summer relative to early summer and fall. A diel study showed a 4-fold increase in Nodularia transcript concentrations at early to mid day relative to rest of the day. Real-time PCR was found to be a powerful and highly sensitive method for measuring gene expression. Since nucleic acids are a prerequisite for molecular analyses of bacterioplankton dynamics a protocol to extract DNA from seawater samples was developed with the aim to maximize the yield of high-quality DNA. Each step in the protocol was important for the efficiency of extraction. The obtained extraction efficiencies were up to 92% for seawater samples and up to 96% for isolates. The protocol provides a guideline for DNA extraction from seawater samples for other studies. In a global sampling campaign (9 locations from polar, tropical and temperate regions) we sampled DNA from surface water and constructed 16S rRNA gene libraries to investigate diversity and biogeography of bacterioplankton. Approx. 80% of the sequences found were similar to sequences already deposited in GenBank, indicating that a large fraction of the marine bacterioplankton already has been sampled, which in turn suggests a limited global bacterioplankton diversity. This thesis have improved our knowledge about the composition and nifH gene expression of the diazotrophic bacterioplankton community in the Baltic Sea and contribute significantly to the discussion on global marine bacterioplankton diversity and biogeography.
Östersjön är ett av världens största brackvattensystem. Den ekologiska balansen i detta hav är hotad på grund av övergödning. Mycket arbete har därför fokuserats på att reducera utsläppen av näringsämnen, speciellt kväve. Dessa ansträngningar kan dock motverkas av bakterier som har förmåga att omvandla luftens kväve till metaboliskt användbart ammonium (kvävefixering). På sommaren är Östersjöns primärproduktion begränsad av kväve, med följden att det årligen uppstår massiva blomningar av kvävefixerande bakterier, framför allt cyanobakterier. Dessa är främst Aphanizomenon och Nodularia, men inte endast de fototrofa cyanobakterierna har förutsättningar att fixera N2. NifH gener (genen som kodar för nitrogenas) bärs också av heterotrofa bakterioplankton, vilket har visats i studier i främst Atlanten och Stilla havet. Med hjälp av två olika odlingsmetoder lyckades vi isolera heterotrofa kvävefixerande bakterier tillhörande klassen γ-proteobakteria från Östersjön. Svårigheten med att finna dessa bakterier ligger i att de kräver en miljö med mycket låg syrehalt för att kunna fixera kväve. Resultaten från denna studie ledde oss vidare till att undersöka vilka organismer som uttrycker nifH genen (och då troligen även fixerar kväve) i Östersjön. En av de bakterier som isolerats kunde påvisas med Realtids PCR i ett relativt stort antal (3 x 104 nifH genkopior per liter) vid en av de ursprungliga provtagningsstationerna. För att söka rätt på de olika organismtyper som uttrycker nifH skapades ett klonbibliotek baserat på mRNA extraherat från havsvatten. Det visade sig då att alla de närmare 100 kloner som sekvenserades tillhörde antingen Aphanizominon eller Nodularia. De heterotrofa bakteriernas nifH genuttryck var troligen i jämförelse med dessa cyanobakterier alltför lågt för att kunna detekteras. Realtids PCR mätningar av Nodularias nifH genuttryck visade på en stor variation mellan de olika provtagningsstationerna samt mellan de olika provtagningstillfällena. Vi fann dock en kraftig ökning under juli med en nedgång igen i augusti. En dygnscykelstudie visade att Nodularia nifH genuttrycket ökade under förmiddagen med en topp mitt på dagen för att sedan minska igen. Detta troligen med anledning av att den energikrävande kvävefixeringsprocessen sker under de ljusa timmarna då cellen får energi från fotosyntesen. I de molekylärbiologiska metoderna som används för att få information om identitet och aktivitet hos skilda organismer krävs att DNA och RNA kan extraheras från prover tagna i naturliga vattenmiljöer. Även om antalet bakterier tillsynes är högt, så är mängden DNA och RNA per liter havsvatten relativt låg, därför krävs ett väl fungerande protokoll för denna extraktion. I en inledande studie i denna avhandling optimerades en metod för att utvinna DNA. Ett antal sådana protokoll finns publicerade men dessa har ofta lågt utbyte. Det nya protokollet har hög effektivitet, vilket gör att små provvolymer kan användas (2 ml jämfört med tidigare flera liter) och därmed ökar hanterbarheten. Vi visar i denna studie att varje steg 7 i DNA-extraktionsprotokollet är viktigt för att ge en hög effektivitet. Detta protokoll kan med fördel användas som vägledning för många olika typer av studier. På grund av att många havsbakterier inte kan bilda kolonier och alltså inte växa på traditionella medier har det varit svårt att få en klar bild av artrikedomen. Molekylärbiologin har dock gjort det möjligt att identifiera bakterier med hjälp av 16S rRNA genen, en enorm mängd gensekvenser från världens alla hav har inkommit till den gemensamma databanken (GenBank). År 2002 gjordes en studie där man sammanställde informationen i denna databank, för att få en bild av artrikedomen i världshaven. Resultatet av denna studie var att det i världshaven fanns färre bakterietyper än vad många forskare har spekulerat i. I denna avhandlig har vi utfört en studie där vi gjorde en stor global provtagning för att se om denna undersökning överensstämde med den datainformativa. Provtagning från nio lokaliteter gjordes i de tempererade, tropiska och polarhaven. Ett genbibliotek från varje lokal gjordes och kloner sekvenserades. Resultatet visar i likhet med den datainformativa undersökningen på en begränsad artrikedom. 80% av gensekvenserna fanns redan i databanken, vilket tyder på att de flesta arter redan har blivit funna. Dessutom visade det sig att få av bakterierna återfanns på alla ställen och många återfanns endast på ett ställe. Utöver detta visade det sig att det fanns en ökad artrikedom ju närmare ekvatorn man kom, vilket tidigare har visats för större organismer. Studierna i denna avhandling har ökat förståelsen för hur sammansättningen av det kvävefixerande bakteriesamhället i Östersjön ser ut samt bidragit till diskussionen om den globala artrikedomen bland bakterioplakton och dess utbredning.

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Crosswhite, F. S., e C. D. Crosswhite. "Nitrogen Fixation in Desert Legumes". University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/609108.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Monteiro, Fanny. "Mechanistic models of oceanic nitrogen fixation". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53104.

Testo completo

Abstract (sommario):

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2009.
Includes bibliographical references (p. 163-185).
Oceanic nitrogen fixation and biogeochemical interactions between the nitrogen, phosphorus and iron cycles have important implications for the control of primary production and carbon storage in the ocean. The biological process of nitrogen fixation is thought to be particularly important where the ocean is nitrogen limited and oligotrophic. This thesis examines some of the mechanisms responsible for the distribution, rates and temporal variability of nitrogen fixation and its geochemical signature in the modern ocean. I employ simple analytical theories and numerical models of ecosystems and biogeochemical cycles, and closely refer to direct observations of the phytoplanktonic community and geochemical tracers of the marine nitrogen cycle. Time-series observations of geochemical tracers and abundances of nitrogen fixers (or diazotrophs) in the northern subtropical gyres suggest variability in nitrogen fixation on interannual and longer timescales. I use a highly idealized, two-layer model of the nitrogen and phosphorus biogeochemistry and ecology of a subtropical gyre to explore the previously proposed hypothesis that such variability is regulated by an internal biogeochemical oscillator. I find, in certain parameter regimes, self-sustained oscillations in nitrogen fixation, community structure and biogeochemical cycles even with perfectly steady physical forcing. The period of the oscillations is strongly regulated by the exchange rate between the thermocline and mixed-layer waters, suggesting a period of several years to several decades for the North Pacific subtropical gyre regime, but would likely be shorter (only a year or so) for the North Atlantic Ocean.
(cont.) Geochemical tracers such as DINxs (=NO3--16PO3-) measure the oceanic departure from the Redfield ratio. DINx, is often used to estimate the rate of nitrogen fixation in the ocean, by quantifying the tracer accumulation along isopycnals. However this tracer reflects an interwoven set of processes including nitrogen fixation, but also denitrification, atmospheric and riverine sources, differential remineralization and complex transport pathways. I examine analytical solutions of the prognostic equation of DINx, and an idealized three-dimensional model of the basin-scale circulation, biogeochemical cycles and ecology of the North Atlantic Ocean. The two approaches demonstrate that the observations of a subsurface maximum in the North Atlantic Ocean and the temporal variability at the station BATS of DINxs can be explained simply by preferential remineralization of organic phosphorus relative to nitrogen. A further analysis reveals that the current geochemical estimates based on inorganic forms of phosphorus and nitrogen underestimate integrated nitrogen fixation rates by a factor of two to six, by neglecting the preferential remineralization effect. Most current understanding of oceanic nitrogen fixation is based on the Trichodesmium, though unicellular cyanobacteria, diatom-diazotroph associations (DDA) and heterotrophic bacteria might be as important in adding nitrogen into the ocean. I employ a self-assembling global ocean ecosystem model to simulate diverse phytoplanktonic diazotrophs in the global ocean and examine how temperature, oligotrophy, iron and phosphate limitations influence the global marine diazotroph distribution.
(cont.) Analogs of Trichodesmium, unicellular diazotrophs and DDA are successful in the model, showing very similar distributions with observations. The total diazotrophic population is distributed over most of the oligotrophic warm (sub)tropical waters in the model. The model demonstrates that temperature is not the primary control, but suggests instead that diazotroph biogeography is restricted to the low fixed nitrogen oceanic regions which have sufficient dissolved iron and phosphate. The theory of resource competition is used to map out regions of iron and phosphate regulation of diazotroph distribution. The theory suggests that diazotrophs are largely regulated by iron availability, in particular in the Pacific and Indian Oceans. The iron cycle is currently not well enough constrained to confidently predict the diazotroph distribution in global ocean models.
by Fanny Monteiro.
Ph.D.

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Abdel, Magid H. M., P. W. Singleton e J. W. Tavares. "Sesbania-Rhizobium Specificity and Nitrogen Fixation". University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/609114.

Testo completo

Abstract (sommario):

The compatibility of potentially nitrogen fixing associations between ten Rhizobium strains and six Sesbania accessions (species) was studied under glasshouse conditions. The rates of N₂ (C₂ H₂) fixation (u moles C₂ H₄ /plant/h) were determined. The various Sesbania accessions responded differently to inoculation with the strains tested. The ANOVA test revealed that there are real accessions (P = 0.01) and strains (P = 0.05) differences. In general the results obtained indicated that the highest mean rate of N₂ (C₂ H₂) fixation and the highest degree of compatibility with strains under test was shown by Sesbania bispinosa (accession BA12). Sesbania grandiflora (accession GL 2.02) ranked next. The performance of Sesbania pachycarpa (accession PCI), Sesbania macrantha (accession MNI), and Sesbania sesban (accession SBIO) in the N₂ (C₂ H₂) assay is lower than that of accessions BAI2 and GL2.02, thus indicating the possibility of lack of compatibility between these three accessions and almost all of the Rhizobium strains studied. Plants of Sesbania rostrata (accession RSI) produced either extremely low or no ethylene (C₂ H₄) quantities in the N₂ (C₂ H₂) assay thus indicative of high specificity or that this legume is not promiscuous at all. However, inoculated and fertilized Sesbania rostrata performed quite satisfactorily and formed profuse N₂-fixing nodules on roots and stems when grown in potted soil under Central Saudi Arabia climatic conditions. The results obtained indicated high variability among treatments in nodule number.

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Nagel, Eric Dale. "Nitrogen fixation in benthic microalgal mats". College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2092.

Testo completo

Abstract (sommario):

Thesis (M.S.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Cheng, J. "Interactions between nitrogen fixation and alternative sources of nitrogen in Gloeothece". Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636244.

Testo completo

Abstract (sommario):

When grown under constant illumination, Gloeothece ATCC 27152, a unicellular cyanobacterium, can use nitrate, nitrite, dinitrogen or ammonium as the sole N-source for growth. The uptake systems for nitrate and nitrite were fully active and ammonium-repressible in N₂-fixing cultures. Nitrite uptake was mediated via two pH-dependent systems: passive diffusion of HNO₂ and active transport of nitrite. Nitrate uptake was highly light-dependent. Ammonium was also transported by passive diffusion of ammonia and active uptake of ammonium, depending on the pH of the medium. Ammonium inhibited nitrate uptake almost completely, but inhibited nitrite uptake only partially. The true inhibitor was a product of ammonium assimilation, possibly glutamine, rather than ammonium itself, since L-methionine-DL-sulphoximine, an inhibitor of glutamine synthetase blocked GS activity very quickly and decreased the inhibitory effect of ammonium. On the other hand, the inhibitory effect of nitrite on ammonium uptake was stronger than that of nitrate. Nitrate and nitrite competitively inhibited each other's assimilation, occurring at the uptake stage. This suggested that nitrate and nitrite were transported by a common transporter in Gloeothece. The rates of nitrate and nitrite uptake were similar, but the uptake of ammonium was much faster than that of either nitrate of nitrite. In contrast to the uptake systems, systems of nitrate and nitrite reductions were substrate-inducible. Ammonium, either generated intracellularly or supplied exogenously, was assimilated via the GS-GOGAT pathway. Nitrite and ammonium inhibited N₂ fixation rapidly. Nitrate inhibited N₂ fixation less rapidly and less extensively, and often temporarily stimulated nitrogenase activity. The inhibitory effects of nitrate and ammonium could be prevented by L-methionine-DL-sulphoximine, suggesting that the true inhibitor of N₂ fixation was an assimilatory product of ammonium rather than ammonium or nitrate itself.

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Mansur, Irdika. "Nitrogen uptake dynamics and biological nitrogen fixation in a silvopastoral system". Thesis, University of Canterbury. Department of Forestry, 1994. http://hdl.handle.net/10092/4243.

Testo completo

Abstract (sommario):

Two sets of field experiment were conducted at the Lincoln University's agroforestry trial. The first experiment was to study nitrogen (N) uptake by radiata pine and pasture, and soil total N changes with time. The second experiment was to assess the magnitude of input from biological nitrogen fixation (BNF) and factors affecting BNF. Lucerne was found to be the most severe competitor with trees. It reduced tree height, root collar diameter and diameter at breast height, and occasionally reduced fascicle dry weight and foliar N content. However, lucerne had a high dry matter yield (DMY), nitrogen concentrations, nitrogen yields, and amounts of nitrogen fixed. It had lower percentage of N derived from atmosphere (%Ndfa) than clover which resulted in a high N removal from the lucerne plot, when the herbage was removed as silage. Clover has high %Ndfa during spring and summer ranging from 83 to 97%. Radiata pine did not affect total N concentration of pastures and %Ndfa of the legumes. However, radiata pine reduced seasonal DMY of the pastures and seasonal and annual DMY of legumes, which led to the reduction of N yield and amount of N fixed. Clovers in ryegrass/clover, cocksfoot/clover and phalaris/clover were estimated to fix 134,71, and 75 kg N ha ⁻¹ year ⁻¹ which were lower than lucerne which was estimated to fix 230 kg N ha ⁻¹ year ⁻¹. The variations of amounts of N fixed by clover in different grass/clover mixtures were due to the persistence and productivity of the clover in pasture mixtures. Nitrogen balance in all pasture treatments was negative showing that N removal in herbage exceeded N input from BNF. Similarly, the total N in the soil decreased with time. Biological nitrogen fixation was important to stabilise N balance in pasture by minimising soil N removal and to ensure a high pasture productivity. Soil moisture and N were likely to be the important resources competed for by pasture plants and the trees. However, the effect of competition was more apparent on altering N status of the trees than that of the pastures. The N status of radiata pine grown with pastures was occasionally marginal. Soil moisture content close to the row of trees was lower than that at the midway between two rows of trees. Rain shadow effect from trees further lowered the moisture content of soil to the north side of trees. Overall the use of ¹⁵N isotope dilution technique for measuring %Ndfa and percentage of grass N derived from transfer (%Ndftrans) has given satisfactory results. Nitrogen transfer from clover to ryegrass/clover was considered as insignificant (<1.5 g m ⁻² annually). The atom % ¹⁵N enrichment in the soil decreased with time.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "Nitrogen Fixation"

1

Ribbe, Markus W., a cura di. Nitrogen Fixation. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-194-9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Polsinelli, M., R. Materassi e M. Vincenzini, a cura di. Nitrogen Fixation. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3486-6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Gresshoff, Peter M., L. Evans Roth, Gary Stacey e William E. Newton, a cura di. Nitrogen Fixation. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-6432-0.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Nishibayashi, Yoshiaki, a cura di. Nitrogen Fixation. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57714-2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Zehr, Jonathan P., e Douglas G. Capone. Marine Nitrogen Fixation. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67746-6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Graham, P. H., M. J. Sadowsky e C. P. Vance, a cura di. Symbiotic Nitrogen Fixation. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1088-4.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

de Bruijn, Frans J., a cura di. Biological Nitrogen Fixation. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781119053095.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Gary, Stacey, Evans Harold e Burris Robert H, a cura di. Biological nitrogen fixation. New York: Chapman and Hall, 1991.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

S, Stacey G., Burris Robert H. 1914- e Evans H. J, a cura di. Biological nitrogen fixation. New York: Chapman & Hall, 1992.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Smith, Barry E., Raymond L. Richards e William E. Newton, a cura di. Catalysts for Nitrogen Fixation. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-3611-8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Capitoli di libri sul tema "Nitrogen Fixation"

1

Olivares, José. "Nitrogen Fixation". In Encyclopedia of Astrobiology, 1121–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1064.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Sprent, J. "Nitrogen fixation". In The Groundnut Crop, 255–80. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0733-4_8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Olivares, José. "Nitrogen Fixation". In Encyclopedia of Astrobiology, 1688–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1064.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Nair, P. K. Ramachandran. "Nitrogen fixation". In An Introduction to Agroforestry, 307–23. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1608-4_17.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Bonga, J. M., e P. von Aderkas. "Nitrogen fixation". In In Vitro Culture of Trees, 150. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-8058-8_9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Burris, Robert H. "Nitrogen Fixation". In Terrestrial Ecosystems and Biodiversity, 321–24. Second edition. | Boca Raton: CRC Press, [2020] | Revised edition of: Encyclopedia of natural resources. [2014].: CRC Press, 2020. http://dx.doi.org/10.1201/9780429445651-41.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Gooch, Jan W. "Nitrogen Fixation". In Encyclopedic Dictionary of Polymers, 910. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14325.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Reitner, Joachim, e Volker Thiel. "Nitrogen Fixation". In Encyclopedia of Geobiology, 690. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9212-1_247.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Lack, Andrew, e David Evans. "Nitrogen fixation". In Plant Biology, 228–30. 2^a ed. London: Taylor & Francis, 2021. http://dx.doi.org/10.1201/9780203002902-68.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Olivares, José, e Juan Sanjuán. "Nitrogen Fixation". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-642-27833-4_1064-3.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Nitrogen Fixation"

1

Dekas, Anne E. "NITROGEN FIXATION IN DEEP-SEA SEDIMENTS". In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-306667.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Stephens, Ifan. "Electrochemical nitrogen fixation: lithium and beyond". In MATSUS Spring 2024 Conference. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2023. http://dx.doi.org/10.29363/nanoge.matsus.2024.371.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Tsuji, Masatoshi, Y. Kawakami, A. Ashida e K. Nitta. "Design of Nitrogen Fixation System for CEEF". In International Conference on Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951583.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Inoue, M., S. Iiyama, T. Numaguchi, K. Kikuchi e K. Nitta. "Development of the Nitrogen Fixation System for CELSS". In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/921238.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

KANG, LIHUA, e HAIBIN MA. "INTERACTION OF ASSOCIATIVE NITROGEN-FIXATION BACTERIA WITH EUCALYPTUS". In Proceedings of the International Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704504_0025.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Tsuji, Masatoshi, Takayuki Sakamoto, Akira Ashida e Keiji Nitta. "Nitrogen Fixation System as a CELSS Subsystem for CEEF". In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/961418.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Aljobeh, Zuhdi Y., Tiffany N. Kolba, Yacoub Aljobeh e Dana Hinaman. "Impact of Autumn Olive Nitrogen-Fixation on Groundwater Nitrate Concentration". In World Environmental and Water Resources Congress 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479865.004.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Natwora, Kaela E., e Cody Sheik. "COMPARISON OF NITROGEN FIXATION RATES ACROSS THE LAURENTIAN GREAT LAKES (LGL)". In 54th Annual GSA North-Central Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020nc-348018.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Wu, Sarah X., Bishal Thapa, Yuan Yuan, Robinson Ndeddy Aka e Alia Nasir. "Optimization of a green plasma process for nitrogen fixation in water". In 2022 Houston, Texas July 17-20, 2022. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2022. http://dx.doi.org/10.13031/aim.202200908.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Tsuji, Masatoshi, Toru Numaguchi, Shigeo Iiyama, Katsutoshi Kikuchi, Keiji Nitta e Akira Ashida. "Experimental Study of Nitrogen Fixation System in a Closed Ecological System". In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1994. http://dx.doi.org/10.4271/941409.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "Nitrogen Fixation"

1

Paul J. Chirik. Understanding Nitrogen Fixation. Office of Scientific and Technical Information (OSTI), maggio 2012. http://dx.doi.org/10.2172/1041006.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Burris, R. H. Enzymology of biological nitrogen fixation. Office of Scientific and Technical Information (OSTI), gennaio 1992. http://dx.doi.org/10.2172/5403340.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Burris, R. H. Enzymology of biological nitrogen fixation. Annual report. Office of Scientific and Technical Information (OSTI), maggio 1992. http://dx.doi.org/10.2172/10138605.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Okon, Yaacov, Robert Burris e Yigal Henis. Biological Nitrogen Fixation in Grass-Azospirillom Association. United States Department of Agriculture, gennaio 1985. http://dx.doi.org/10.32747/1985.7593407.bard.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

James W Golden. Regulation of Development and Nitrogen Fixation in Anabaena. Office of Scientific and Technical Information (OSTI), agosto 2004. http://dx.doi.org/10.2172/838436.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Golden, James W. Regulation of Development and Nitrogen Fixation in Anabaena. Office of Scientific and Technical Information (OSTI), ottobre 2008. http://dx.doi.org/10.2172/939624.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Jurkevitch, Edouard, Carol Lauzon, Boaz Yuval e Susan MacCombs. role of nitrogen-fixing bacteria in survival and reproductive success of Ceratitis capitata, the Mediterranean fruit fly. United States Department of Agriculture, settembre 2005. http://dx.doi.org/10.32747/2005.7695863.bard.

Testo completo

Abstract (sommario):

Objectives: to demonstrate nitrogen fixation in the gut of Ceratitiscapitata, the Mediterranean fruit fly and that fixed nitrogen is important for the fly. Background: Fruit flies (Diptera: Tephritidae) are a highly successful, widespread group of insects causing enormous economic damage in agriculture. They are anautogenous, i.e. the acquisition of nitrogenous compounds by both male and female is essential for the realization of their reproductive potential. Nitrogen, although abundant in the atmosphere, is paradoxically a limiting resource for multicellular organisms. In the Animalia, biological nitrogen fixation has solely been demonstrated in termites. Major achievements and conclusions: We found that all individuals of field-collected medflies harbor large diazotrophicenterobacterial populations that express dinitrogenreductase in the gut. Moreover, nitrogen fixation was demonstrated in isolated guts and in live flies and may significantly contribute to the fly’s nitrogen intake. Specific components of these communities were shown to be transmitted vertically between flies. Moreover, we found that the gut bacterial community changes during the fly’s active season both in composition and complexity. Moreover, strong changes in community structure were also observed between the fly's various developmental stages. An initial analysis using SuPERPCR, a technology enabling the detection of minor populations by selective elimination of the dominant 16S rDNA sequences revealed that Pseudomonasspp. may also be part of the gut community. Implications: The presence of similar bacterial consortia in additional insect orders suggests that nitrogen fixation occurs in vast pools of terrestrial insects. On such a large scale, this phenomenon may have a considerable impact on the nitrogen cycle.

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Cramer, Stephen. Support for the 19th International Congress on Nitrogen Fixation. Office of Scientific and Technical Information (OSTI), gennaio 2018. http://dx.doi.org/10.2172/1418239.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Westgate, Mark E., Gerald Sebuwufu e Mercy K. Kabahuma. Enhancing Yield and Biological Nitrogen Fixation of Common Beans. Ames: Iowa State University, Digital Repository, 2012. http://dx.doi.org/10.31274/farmprogressreports-180814-203.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Kahn, Michael, Svetlana Yurgel, Aaron Ogden, Mahmoud Gargouri, Jeong-Jin Park, David Gang, Kelly Hagberg et al. Unbalancing Symbiotic Nitrogen Fixation: Can We Make Effectiveness More Effective? Office of Scientific and Technical Information (OSTI), febbraio 2021. http://dx.doi.org/10.2172/1764578.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!