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Dissertations / Theses on the topic 'Anoxic zones'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 March 2023

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1

Trouwborst, Robert Elisa. "Geochemistry of manganese and iron across both stable and dynamic natural oxic-anoxic transition zones." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.64 Mb., 177 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3200548.

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2

Conway, Carol Leza, and n/a. "Oxic and anoxic transformations of leaf derived organic matter in freshwater systems." University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20060519.105559.

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In Australia, significant effort goes into reducing the amount of nitrogen and phosphorus entering inland waters from point sources. However, little is known of the extent to which riparian organic matter may act as a source of these nutrients. Also, whilst the relationships between the nitrogen, phosphorus and carbon cycles are broadly known, there is little quantitative data regarding the release of these elements from Australian riparian organic matter and their subsequent microbial mineralisation within aquatic environments. In particular, comparatively little is known of their comparative

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3

Nair, Arthur William. "Investigation of the Effects of Sequential Anaerobic, Anoxic and Aerobic Zones on Dissolved Oxygen Transfer Parameters in a biological Nutrient Removal Pilot Plant." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46264.

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Bench and pilot scale determinations of the volumetric oxygen transfer coefficient, K<sub>L</sub>a, were performed on an improved A²/O biological nutrient removal (BNR) pilot plant. Effluent from a full scale primary clarifier, used as pilot plant influent, was found to have an alpha (ratio of process to clean water K<sub>L</sub>a) of 0.71 as determined in a 21 liter bench scale reactor and an alpha of 0.332 as determined in a 0.45 m³ aeration basin of the 2.4 m³ pilot plant. Alpha of a 1:1 mixture of primary clarifier effluent with pilot plant return activated sludge was determined to be 0.94

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4

Montes-Herrera, Enrique. "Seasonal Changes in the Sinking Particulate Flux and in the Nitrogen Cycle within the Euphotic and Twilight Zones of the Cariaco Basin, Venezuela." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3253.

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This study explored the effects of seasonal variability on the geochemistry of sinking pthesiss and on the nitrogen cycle of the Cariaco Basin. Pthesis fluxes were measured at the base of the euphotic zone (the depth of 1% of photosynthetically active radiation - PAR) with drifting sediment traps during months of upwelling and non-upwelling regimes from March 2007 to November 2009. Flux estimates were analyzed in the context of seasonal variations in sea surface temperature, primary productivity, and chlorophyll a concentrations using data generated by the CARIACO Time-series Program as well a

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5

Buchwald, Carolyn. "Nitrogen cycling in oxygen deficient zones : insights from [delta]¹⁵N and [delta]¹⁸O of nitrite and nitrate." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79346.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2013.<br>In title on title page, "[delta]" appears as lower case Greek letters. Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The stable isotopes, [delta]¹⁵N and [delta]¹⁸O, of nitrite and nitrate can be powerful tools used to interpret nitrogen cycling in the ocean. They are particularly useful in regions of the ocean where there are mul

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6

Turner, Andrew David. "Recognition of photic zone anoxia from LC-MS studies of porphyrin distributions in ancient sediments." Thesis, University of Bristol, 1998. http://hdl.handle.net/1983/23c52c13-eaf1-4c6d-9282-60c42e81f228.

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7

Gibbison, Robert. "Porphyrins and 1H-pyrrole-2,5-diones (maleimides) as indicators of anoxygenic photosynthesis in palaeowater columns." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296647.

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8

Crawford, Neil Adrian. "Maleimides (1H-pyrrole-2, 5-diones) from ancient sediments as indicators of photic zone anoxia." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299604.

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9

Lehours, Anne-Catherine. "La communauté procaryotique dans les zones anoxiques de deux écosystèmes lacustres : structure et diversité. Etude plus particulière de son rôle fonctionnel dans le monimolimnion." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00703327.

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Les études présentées dans ce manuscrit traitent de la diversité et de l'écologie des communautés procaryotiques des zones anoxiques pélagiques de deux écosystèmes lacustres : le lac d'Aydat, typiquement eutrophe, qui présente en période de stratification thermique un hypolimnion anoxique ; et le lac Pavin, unique lac méromictique de France, exhibant une zone anoxique permanente. Les analyses de la structure, de la diversité, et de la dynamique spatiale et- /ou temporelle du bacterioplancton des strates anoxiques de ces deux lacs par des approches moléculaires ont révélé une forte diversité mi

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10

Terrisse, Fanny. "Influence des oscillations anoxie/oxie sur des communautés microbiennes hydrocarbonoclastes de sédiments intertidaux." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3056/document.

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Les écosystèmes côtiers sont des milieux complexes au sein desquels les communautés microbiennes, jouant un rôle majeur dans leur fonctionnement et leur maintien, s’adaptent et sont tolérantes à des conditions environnementales fluctuantes. En effet, au rythme des marées et de l'activité de la macrofaune, des oscillations oxie/anoxie influencent la composition et la dynamique des communautés microbiennes et par conséquent leur implication métabolique. Afin d’appréhender le devenir du pétrole dans ces écosystèmes, il est donc indispensable d’apporter des connaissances sur l’écologie des microor

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11

Hulsman, Andrew Charles. "The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/8302.

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Includes bibliography.<br>Filamentous bulking, which causes deterioration in sludge settleability has been shown, in two nation-wide surveys to be a problem of considerable proportions. Poor sludge settleability in the secondary clarifier limits the daily flow and load that can be treated in activated sludge wastewater treatment plants. Controlling sludge settleability to relatively low levels i.e. Diluted Sludge Volume Index (DSVI < 100 rnl/g) by controlling filamentous organism proliferation would allow increased daily flow and loads by up to 100 on existing activated sludge wastewater treat

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12

Vu, Anh Quang. "Etude des mécanismes de corrosion - cicatrisation d'aciers revêtus par des alliages d'aluminium : sur tranche et en zone confinée : approche expérimentale et numérique." Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS062/document.

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L’objectif de ce travail était d’étudier les mécanismes de corrosion-cicatrisation d’aciers revêtus par des alliages d’aluminium, sur tranche et en zone confinée. Sur la tranche, les techniques de mesures locales ont été utilisées pour étudier le comportement de deux types de revêtements sacrificiels : l’un étant constitué d’un alliage d’aluminium à 55% en masse et de Zn (Aluzinc) et d’un alliage d’aluminium contenant environ 11% silicium (Alusi). L’ensemble des résultats montre que les revêtements à base alliages d’aluminium ont un comportement sacrificiel qui dépend fortement de leur composi

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13

Angonin, Diane. "Lineage-specific manipulation of subventricular zone germinal activity for neonatal cortical repair." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1175/document.

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L'hypoxie périnatale entraîne une dégénérescence et un délai de maturation des oligodendrocytes et des neurones corticaux du cortex cerebral. Mon projet de thèse a d'abord consisté à étudier la contribution des cellules souche neurales de la zone sous-ventriculaire dorsale (dSVZ) à la tentative de régénération spontanée observée après la lésion. Dans un second temps, j'ai étudié la capacité de ces cellules souches à être manipulée en utilisant une approche pharmacologique.Mes résultats mettent en évidence une réponse spontanée et dynamique de la dSVZ qui produit des neurones et des oligodendro

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14

Junior, Osmar Antunes. "Novos dispositivos de microextração e pré-concentração para eletroforese capilar utilizando membranas microporosas ou processos eletroquímicos e sua potencialidade na análise de aminas e metais." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-16122008-162344/.

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A eletroforese capilar (CE) é uma técnica de separação eficiente, que tem merecido grande atenção nas últimas duas décadas, e que oferece soluções analíticas alternativas ou complementares à cromatografia líquida num número crescente campos de aplicação, incluindo análises de fármacos, compostos biológicos e biogênicos, dentre outros. Entre as vantagens comparativas da técnica figuram separações mais rápidas com pequeno dispêndio de amostras, solução tampão (e solvente orgânico, se usado), baixo custo de operação e manutenção. Todavia, a exigüidade de amostra no capilar tem como reflexo, via d

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15

Beveridge, Ian Alexander. "Acoustic observations of zooplankton distribution in Saanich Inlet, an intermittently anoxic fjord." Thesis, 2007. http://hdl.handle.net/1828/2287.

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A biological front at the mouth of Saanich Inlet results in higher rates of primary productivity at the inlet mouth relative to the head creating a gradient that could influence zooplankton distribution. A shallow sill (75m) at the inlet mouth restricts circulation below sill depth, isolating the deep basin for much of the year. Anoxia develops in the isolated basin and the depth of the anoxic layer changes during the year. During the day, pelagic zooplankton form a deep scattering layer. Between April 2005 and March 2006. I conducted monthly 200kHz acoustic surveys between the mouth and head

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16

Eerkes-Medrano, Dafne I. "The role of oxygen and other environmental variables on survivorship, abundance, and community structure of invertebrate meroplankton of Oregon nearshore coastal waters." Thesis, 2011. http://hdl.handle.net/1957/26610.

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The high productivity of Eastern Boundary Upwelling Ecosystems (EBUE), some of the most productive ecosystems in the globe, is attributed to the nutrient rich waters brought up through upwelling. Climate change scenarios for coastal upwelling systems, predict an intensification of coastal upwelling winds. Associated with intensification in upwelling are biogeochemical changes such as ocean hypoxia and ocean acidification. In recent years, the California Current System (CCS) has experienced the occurrence of nearshore hypoxia and the novel rise of anoxia. This has been attributed to changes in

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17

Bertagnolli, Anthony D. "Microbial diversity, metabolic potential, and transcriptional activity along the inner continental shelf of the Northeast Pacific Ocean." Thesis, 2012. http://hdl.handle.net/1957/29353.

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Continental shelves located along eastern boundary currents occupy relatively small volumes of the world’s oceans, yet are responsible for a large proportion of global primary production. The Oregon coast is among these ecosystems. Recent analyses of dissolved oxygen at shallow depths in the water column has suggested increasing episodes of hypoxia and anoxia, events that are detrimental to larger macro-faunal species. Microbial communities, however, are metabolically diverse, capable of utilizing alternative electron donors and acceptors, and can withstand transient periods of low dissolved o

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18

Chang, Fang-Wen, and 張芳文. "By Use of Anoxic/Oxic Treatment System to Remove Ammonium Nitrogen from Industrial Zone Wastewater." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6gtrq5.

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碩士<br>龍華科技大學<br>化工與材料工程系碩士班<br>106<br>Ammonia nitrogen refers to the compound in the form of free ammonia (NH3) and nitrogen ion (NH4+). When excess ammonia nitrogen is discharged into the water body, the water body will be eutrophicated and the ornamental value of the water body will be reduced. The ammonia nitrogen will dissolve dissolved oxygen in the water during the nitrification process. In addition to the deterioration of water quality, the formation of nitrates and nitrites can also affect the growth of aquatic organisms and even human health. This study is aimed at the wastewater from

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19

Hughes, Mark Patrick 1986. "Optimizing denitrification at Austin’s Walnut Creek Wastewater Treatment Plant." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1529.

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In natural waters, high concentrations of ammonia are toxic to fish, and the oxidation of ammonia to nitrate (NO₃-) consumes large quantities of dissolved oxygen. The influent to municipal wastewater treatment plants in the United States typically contains approximately 40 mg/L of ammonia nitrogen (NH₃₋ N). Almost all of this ammonia must be removed in a wastewater treatment process before the effluent is discharged to the natural environment. This dramatic decrease is accomplished by the aerobic biological process of nitrification, in which ammonia is oxidized to nitrate Biological denitrific

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