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Relevant bibliographies by topics / Biogenic element / Dissertations / Theses

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Dissertations / Theses on the topic 'Biogenic element'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Dissard, Delphine [Verfasser]. "Development of a mechanistic understanding of element incorporation into biogenic carbonate (foraminifera) / Delphine Dissard. Alfred Wegener Institute for Polar and Marine Research." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2010. http://d-nb.info/1034995049/34.

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2

Ligtenberg, Jora. "Lake condition changes of a boreal lake over the past ca. 6500 years based on varve geochemistry." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-136100.

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The purpose of this study was to assess changes in the in-lake conditions of lake Kassjön, northern Sweden, in response to environmental and climate changes over the past ca. 6500 years. Sediment concentrations of different elements and biogenic silica (bSi) were measured with wavelength dispersive X-ray fluorescence spectrometry (XRF) and Fourier transform infrared spectroscopy (FTIR), respectively. The lake-water total organic carbon (LWTOC) content was inferred based on near-infrared spectroscopy (NIRS). The marine sediment was distinguished from the lacustrine sediment by higher dry bulk d

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3

Штанько, Т. В., Дмитро Олексійович Лазненко, Дмитрий Алексеевич Лазненко та Dmytro Oleksiiovych Laznenko. "Очищення комунальних стічних вод від фосфатів". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/63209.

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Наявність біогенних елементів в водних об’єктах призводить до розвитку ціанобактерій (синьо-зелених водоростей) і заростання ними водойм, зменшення розчиненого кисню, погіршення умов для розвитку рослинного і тваринного світу та порушення нормального функціонування природних екосистем. Враховуючи це, сьогодні велику увагу приділяють технологіям очищення стічних вод від біогенних елементів, і зокрема, фосфору.

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4

Greaves, Mervyn John. "Trace elements in marine biogenic carbonates : analysis and application to past ocean chemistry." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63291/.

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Trace elements in marine biogenic carbonates may be used as proxies for past ocean chemistry provided that there is an established relationship between the trace element proxy and a parameter of interest, this relationship is preserved within biogenic carbonate, and the trace element can be determined sufficiently accurately. Successful application of any trace element proxy requires both development of the analytical methodology to ensure accurate data with the necessary sensitivity, and an understanding of the relationship between proxy and seawater chemistry. Herein I develop methods for th

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5

Jain, Rohan. "Biogenic nanoparticles of elemental selenium : synthesis, characterization and relevance in wastewater treatment." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1178/document.

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Les nanoparticules exposent beaucoup de propriétés uniques en comparaison de la possession de matériels (matières) en gros (vrac) à leur haute surface au ratio de volume. Des nanoparticules de sélénium élémentaires exposent aussi les nouvelles propriétés qui sont exploitées dans la formation de cellules solaires, des redresseurs de semi-conducteur et le déplacement (déménagement) de mercure et le cuivre. Cependant, la synthèse chimique de nanoparticules de sélénium élémentaires est coûteuse, exige des équipements spécialisés et utilise des produits chimiques toxiques. D'autre part, la producti

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6

Ekeroth, Nils. "Benthic fluxes of biogenic elements in the Baltic Sea : Influence of oxygen and macrofauna." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114598.

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This thesis investigates how benthic fluxes of phosphorus (P), nitrogen (N), and silicon (Si) change upon oxygenation of anoxic soft bottoms in the brackish, eutrophicated Baltic Sea. Direct measurements in situ by benthic landers demonstrated that fluxes of dissolved inorganic P (DIP) from anoxic bottom sediments in the Eastern Gotland Basin are higher than previously thought (Paper I). It is argued that the benthic DIP flux has a much larger influence on the DIP inventory in the Baltic proper than the external sources. Similarly, benthic fluxes of DIP and dissolved inorganic N (DIN) from ano

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7

Chambers, Rose Tamsin. "Trace elements in an Antarctic ice core as potential indicators of marine biogenic activity." Thesis, University of East Anglia, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437649.

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8

Yigiterhan, Oguz. "Trace Metal Composition Of Particulate Matter In The Water Column And Sediments Of The Black Sea And Regional Rivers." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606507/index.pdf.

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The Black Sea, with its oxic, suboxic and anoxic layers, provides a unique environment for studying how biological and geochemical processes affect the composition of particulate matter. The elemental composition of particles in the Black Sea is controlled by their origin and sources. Particles from rivers are dominated by aluminosilicate material that has compositions similar to the earth&rsquo<br>s crust. In general this material is relatively unreactive. Biological processes in the upper oxic and suboxic layers of the water column result in enrichments of elements which used as nutrients. C

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9

Staicu, Lucian. "Production of colloidal biogenic elemental selenium and removal by different coagulation-flocculation approaches." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1180/document.

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Le sélénium (Se) est un élément chalcogène avec un domaine de concentration étroit entre essentialité et toxicité. La toxicité est principalement liée à la spéciation chimique du Se qui évolue en fonction des conditions redox du milieu. Les formes oxyanioniques de Se, le sélénite (Se [IV], SeO32-) et le séléniate (Se [VI], SeO42-), sont solubles dans l'eau, biodisponibles et toxiques. En revanche, le sélénium élémentaire, Se(0), est insoluble et moins toxique. Néanmoins, les nanoparticules du Se(0) sont potentiellement dangereuses pour certains groupes des mollusques (comme les bivalves) et au

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10

Faleh, El Mâti el. "Les mecanismes de synthese de l'apatite par activite bacterienne : role et comportement de quelques elements mineraux, application aux phosphates sedimentaires." Strasbourg 1, 1988. http://www.theses.fr/1988STR13038.

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La synthese des apatites a ete realisee dans un milieu liquide d'eau douce ou marine, par transformation de carbonate et par precipitation directe. La cristallogenese de ces mineraux necessite une activite bacterienne indispensable a la biodegradation de la matiere organique (arn) et a la mineralisation du phosphore sous forme d'acide phosphorique. En plus de leur activite biodegradante, les bacteries servent de site a la nucleation et a la cristallisation purement chimique de l'apatite hors de leur membrane. Cette nucleation est favorisee par une forte saturation en phosphore, calcium et fluo

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11

Prakash, Babu Chakka. "The marine geochemistry of biogenic and redox sensitive elements in the oxygen minimum zone of western continental margin of India surface sediments." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=95884917X.

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12

Gray, W. R. "The role of the North Pacific Ocean in the deglacial CO₂ rise : insights from trace elements and boron isotopes in biogenic carbonates." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1461263/.

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The ∼90 ppmv increase in atmospheric CO₂ over the last deglaciation was most likely driven by changes in the way the high latitude oceans regulate the exchange of dissolved inorganic carbon (DIC) between the surface and interior ocean, however the mechanisms involved in this repartitioning remain unclear. The subarctic Pacific Ocean is currently a significant source of CO₂ to the atmosphere due to mixing of DIC-rich intermediate waters into the surface ocean and incomplete nutrient utilisation. It is hypothesised that during the last glacial period increased stratification of the subarctic Pac

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13

Masilionytė, Laura. "Skirtingo našumo dirvožemių pokyčiai ekologinėje ir tausojamojoje žemdirbystės sistemose." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_081456-68509.

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1. Ištirti skirtingo humusingumo glėjiškame rudžemyje alternatyviose intensyviajai žemdirbystės sistemose su daugiamečių žolių atolu ir tarpinių pasėlių biomase į dirvožemį įterptų biogeninių elementų kiekį ir jų poveikį sėjomainos augalų produktyvumui. 2. Įvertinti su trąšomis įterptų ir su derliumi prarastų biogeninių elementų NPK balansą ekologinės bei tausojamosios žemdirbystės sistemose ir nustatyti judriųjų fosforo ir kalio pokyčius dirvožemyje. 3. Nustatyti tausojamosios ir ekologinės žemdirbystės sistemose tarpiniuose pasėliuose augintų augalų biomasėje sukaupto azoto poveikį Nmin. din

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14

Lemaitre, Nolwenn. "Approche multi-proxy (Thorium-234, Baryum en excès) des flux d'export et de reminéralisation du carbone et des éléments nutritifs associés à la pompe biologique océanique." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0009/document.

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L’objectif principal de cette thèse est de mieux comprendre les différents facteurs contrôlant la pompe biologique de carbone en Atlantique Nord et dans l’Océan Austral, à proximité des îles Kerguelen, en utilisant notamment deux approches: le Thorium-234 (234Th) et le baryum biogénique (Baxs).En Atlantique Nord, les flux d’export de carbone organique particulaire (POC) augmentent lorsqu’ils sont associés à des minéraux biogéniques (silice biogénique et carbonate de calcium) et lithogènes, capable de lester les particules. L’efficacité d’export, généralement plus faible que précédemment suppos

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15

Prakash, Babu Chakka [Verfasser]. "The marine geochemistry of biogenic and redox sensitive elements in the oxygen minimum zone of western continental margin of India surface sediments / von C. Prakash Babu." 1999. http://d-nb.info/95884917X/34.

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16

Greta, Baggio. "Investigation on Bacterial Selenite Reduction to Elemental Selenium by Bacillus mycoides SeITE01 and Stenotrophomonas maltophilia SeITE02 through Spectroscopic and Metabolomics Analyses, with Characterization of Biogenic Selenium Nanoparticles (Bio-SeNPs)." Doctoral thesis, 2020. http://hdl.handle.net/11562/1015752.

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Bacillus mycoides SeITE01 and Stenotrophomonas maltophilia SeITE02 are environmental bacterial isolates that rely on detoxification processes to transform selenite (SeO32-), a highly toxic and bioavailable chemical species of selenium, into insoluble and virtually nontoxic elemental selenium (Se0) with the formation of biogenic selenium nanoparticles (Bio-SeNPs). In the last decade, Bio-SeNPs have attracted attention for their interesting applications in the nanotechnology, industrial and medical fields not only due to their special physico-chemical features, but also for their attractive anti

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