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Hannach, Gabriela. "Phenotypic plasticity in the red alga Porphyra abbottae : environmental factors influencing light harvesting ability /". Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/5210.
Pełny tekst źródłaCurtis, Bruce Anthony. "A morphological and phylogenetic investigation of Porphyra linearis Greville and Porphyra purpurea (Roth) C. Agardh forms from Nova Scotia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23688.pdf.
Pełny tekst źródłaGriffin, Neil John. "Harvest ecology and biodiversity of South African Porphyra". Doctoral thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/10564.
Pełny tekst źródłaPorphyra (Bangiales, Rhodophyta) is the world's most valuable maricultured seaweed, due to its high value as a food crop. The vast majority of Porphyra in South Africa belongs to P. capensis, a morphologically and ecologically plastic taxon apparently endemic to the region. There is no demand for P. capensis as a food crop, as it is unsuitable for the market, and there are no records of its customary use locally. Porphyra capensis is however a potentially highly valuable fodder for the mariculture of abalone (Haliotis midae), and pressure to harvest it has recently increased. This study aims to assess the potential for harvest of Porphyra on the south-western shores of South Africa. There are two main thrusts to this work. The fIrst thrust examines Porphyra as an ecological entity in the region. The second thrust reassesses the taxonomy of Porphyra species in the region.
Schweikert, Katja, i n/a. "The functional biology of Porphyra sp. in New Zealand". University of Otago. Department of Botany, 2007. http://adt.otago.ac.nz./public/adt-NZDU20080910.114121.
Pełny tekst źródłaTala, Fadia. "Fenologia e ecofisiologia das macroalgas Porphyra spp. (Bangiales, Rhodophyta) e Lessonia spp. (Laminariales, Phaeophyceae) na costa norte e central do Chile: variações latitudinais e sazonais". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-31032014-110235/.
Pełny tekst źródłaThe purpose of phenological studies is to describe and understand how the development of the organisms occurs in response to environmental variations which change cyclically and how certain factors stimulate the generation of signals and a cascade of reactions from molecular, biochemical and physiological levels, which at the end manifests annual patterns of abundance and reproduction. Environmental changes occur in time scale (daily, seasonal, interannual) and spatial scale (latitudinal, depth, altitude) and have a strong impact on growth and development of the species, especially those with sessile characteristics. The purpose of this study was to characterize the phenology (seasonal and latitudinal) of abundance, reproduction, photosynthesis and antioxidant capacity of two macroalgae with ecological and economic importance, Porphyra spp. (Rhodophyta) and Lessonia spp. (Phaeophyceae), distributed along the coast north and center (25° - 34°S) in Chile. The results show that seasonal changes in radiation and latitudinal temperature significantly influence the phenological and ecophysiological responses of the species studied. For Porphyra spp., the most notorious temporal adjustment involves an annual phenological development from north population in contrast to perennial populations from central and south. The physiological characteristics showed decrease in photosynthetic efficiency, pigments (chlorophyll a, carotenoids and phycobiliproteins) and soluble proteins in spring-summer, accompanied by increasing in antioxidant capacity. For Lessonia spp., although the abundance showed no seasonal changes between the populations, the most notoriously temporal adjustment occurs in physiological characteristics with decrease in photosynthetic efficiency, pigments (chlorophylls a and c, carotenoids), phenols and antioxidant capacity during the summer, followed by increase in thallus absorptance, ETRmax and NPQ. Studies on the taxonomic identity of Porphyra populations are required to distinguish between possible characteristics due to species-specific patterns from morphological or ecotypes variations. Studies in the species Lessonia near their limits of biogeographical distribution could elucidate whether the phenological and physiological differences are due to patterns species-specific or are masked by local environmental characteristics. The phenological studies and changes in the biochemical/physiological levels can subsidize new destination of biomass production and raw material from organisms economically important. Moreover, changes in typical phenological and ecophysiological patterns can give a light about environmental impacts of alterations such as global climate changes, contamination and pollution, overexploitation and interactions and dynamics between populations.
McGregor, Bruce Jonathan. "Aspects of the biology of Porphyra (Bangiales, rhodophyta) of the Isle of Man". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317182.
Pełny tekst źródłaYalo, Masande Nicholas. "An investigation of the natural products composition of Porphyra capensis (a red seaweed)". University of the Western Cape, 2017. http://hdl.handle.net/11394/6354.
Pełny tekst źródłaPlants have been widely used in traditional medicine for a number of ailments, among which may be included infectious diseases such as colds, influenza, chicken pox, TB, etc. as well as lifestyle diseases such as diabetes and cancer. Seaweeds have also been shown to contribute to the maintenance of health through their nutritional and medicinal properties and recently, a great deal of interest has developed towards the isolation of bioactive compounds from marine sources due to their numerous health benefits. Furthermore, marine algae are valuable sources of structurally diverse metabolites with scientifically proven therapeutic claims. Chemical constituents of red seaweed, Porphyra capensis was investigated in this present study along with subsequent brine shrimp lethality assay analysis of the crude extracts. The compounds isolated from the plant were from the hexane (6) and butanol (2) extracts. These compounds were all isolated and purified by various chromatographic techniques, namely silica gel chromatography, Sephadex LH-20 gel as well as C18 reversed phase silica gel. The structures of the isolated compounds were analysed and characterised by NMR, GC-MS, ESI MS and FTIR spectroscopy. Eight compounds were isolated and identified as phytol, desmosterol, 9-eicosenoic acid, 5,8,11,14,17-eicosapentanoic acid, palmitic acid, methyl (E)-hexadec-9-enoate, glycerol and compound 1 (novel compound). All the compounds were isolated from Porphyra capensis for the first time. The hexane, butanol and methanol extracts were found to be non-toxic with the brine shrimp test LC50 value at least two times greater than ?g/ml.
Oliveira, Mariana Cabral de. "Filogenia de Porphyra spp. (Rhodophyta): sequenciamento do gene nuclear para o RNA da subunidade pequena do ribossomo (rDNA 18S) e estudos morfológicos da fase Conchocelis". Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-09082016-164600/.
Pełny tekst źródłaThe red algas genus Porphyra has considerable economic importance, and some species are extensively cultivated for human food. The genus is represented by more than 70 species, and occurs worldwide. Its taxonomy, based mainly on morphological characters of the macroscopic phase of its life-cycle is still unsettled. Alternatives to try to understand better the taxonomy and evolutive history of the genus were ascertained. It was verified that characters of the microscopic, filamentous phase, of the life-cycle of Porphyra may be used to complement the traditional taxonomic studies. To try to elucidate the phylogenetic position of Porphyra relative to the other red algae, and within the genus, among isolates from different locations, nuclear-encoded small-subunit ribosomal RNA genes (18S rDNAs) were PCR-amplified, cloned and completely sequenced. Three species of Porphyra from Nova Scotia and two species from Brasil were aligned with 18S sequences of other eukaryotes, including one published sequence of \"Porphyra umbilicalis\" from France. Phylogenetic trees were constructed by parsimony, distance and maximum-likelihood procedures. Analysis of our data revealed that these Porphyra species represented one of the deepest branches so far discovered within red algae. There was a great degree of primary sequence difference between Porphyra (subclass Bangiophycidae), and the other red algae belonging to the subclasses Florideophycidae. These results support the division of red algae into two subclasses by traditional taxonomy. Among eukaryotes Porphyra diverges at the same point as the Cryptomonas nucleomorph. The great among of sequence divergence, and the fossil record suggest that Porphyra, my indeed, be a very primitive red alga. Surprisingly, the 18S RNA sequence of the French \"Porphyra umbilicalis\" does not fit in our Porphyra category; instead, it has more than 99% identity with a species of Palmaria belonging to the subclass Florideophycidae. Therefore it was concluded that \"P. umbilicalis\" with the published sequence was actually a Palmaria palmate that was misidentified. During the phylogenetic analysis it was found that a group IC1 intron occurs in nuclear 18S rRNA genes of Porphyra spiralis var. amplifolia. This intron occurs at the same position of the group IC1 introns in 18S rDNAs of the fungus Pneumocystis carinii, Protomyces inouyei and the green alga Chlorella ellipsoidea, and shares primary-structural identity with the Pn. Carinii intron in domains P1 and P2, outside the conserved core. Three size-variants, differing in amount of optimal sequence in P1, exist and are differentially distributed in geographically distinct populations. The largest variant can self-splice in vitro. Open reading frames are present, but do correspond to known genes. Introns are present in the 18S rDNAs of several other Porphyra species, that may also have intronless rDNA copies
Dlaza, Thembinkosi Steven. "Development in culture, ecophysiology and nutritional content of three South African Porphyra (Rhodophyta, Bangiales) species". Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10425.
Pełny tekst źródłaLuo, Jin-Li. "Porphyrin metabolism in porphyria cutanea tarda". Thesis, Open University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315308.
Pełny tekst źródłaGuo, Rong. "Porphyrin metabolism in congenital erythropoietic porphyria". Thesis, Open University, 1992. http://oro.open.ac.uk/57392/.
Pełny tekst źródłaAguilar, Velasquez Blanca Yessenia. "Elucidación estructural del polisacárido del alga roja Porphyra columbina y determinación in vivo de la capacidad antioxidante e hipolipemiante". Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4287.
Pełny tekst źródłaThe main aim of this thesis is the structural elucidation of polysaccharide from the red seaweed Porphyra columbina, hot water extracted, purified and lyophilized, and the study of its antioxidant activity in mice and the lipid-lowering effect in Rabbits. Prior acute oral toxicity was evaluated considering the biological material would be exposed to different concentrations of the same. The IR and 1H-NMR spectrum shows that the polysaccharide of P. columbina has a typical porphyran structure: β-D-galactose, 4-O-α-L-galactose-6-sulphate or 3,6-anhydro-α-L-galactose units. The toxicity study for the case of acute oral toxicity shown to be nontoxic up to 2000 mg/Kg strength, and for repeated dose 28-day oral toxicity study to 50 mg/kg liver damage is evident. In vivo tests in mice measured the activities of antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) as well as the mean levels of malondialdehyde (MDA). The results show increase of the 3 enzymes tested also decreased MDA by intraperitoneal administration dose-dependent polysaccharide. Hypolipidemic effect in rabbits was determined by the evaluation of the lipid profile: measurement of C, TG, HDL and LDL and VLDL was calculated. The results were statistically significant, p < 0.05, for both lipids and lipoproteins in assessment compared with control group of lipemia. Body weight of the rabbits showed significant differences, p < 0.05, for the groups in treatment. Keywords: Porphyra, porphyrano, lipid peroxidation, antioxidant, hypolipidemic, lipoprotein.
Tesis
Hana, Kucera. "Species identification and discovery in common marine macroalgae: Fucus, Porphyra and Ulva using a DNA barcoding approach". Thesis, University of New Brunswick, 2010. http://hdl.handle.net/1882/1090.
Pełny tekst źródłaHafting, Jeff T. "Strategies for growth management of Porphyra yezoensis(ueda) blades in suspension cultures, a step towards land-based mariculture". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27152.pdf.
Pełny tekst źródłaBlouin, Nicolas Achille. "Asexual Reproduction in Porphyra umbilicalis (L.) Kützing and Assessment of its Use in Integrated Multi-trophic Aquaculture (IMTA)". Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/BlouinNA2006.pdf.
Pełny tekst źródłaHolmes, Mary Jane. "Phenology and observations on the morphology, cytology and life history of species of Porphyra (Bangiales, Rhodophyta) from Britain". Thesis, Bath Spa University, 2004. http://researchspace.bathspa.ac.uk/1451/.
Pełny tekst źródłaMorais, Tania N. "Phosphorus, nitrogen, and carbon nutrition in fresh and starved gametophytes of the red alga Porphyra purpurea (Roth) C. Agardh and occurrence of polyphosphates". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0030/MQ65511.pdf.
Pełny tekst źródłaAzevedo, Vítor Manuel Madureira. "Lipidomic study of the red marine macroalgae as source of bioactive compounds". Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17513.
Pełny tekst źródłaMarine macroalgae, or seaweeds, have gained an increased interest in recent times for the use in various biotechnological applications, due to the added-value of their chemical constituents. Among them, glycolipids and phospholipids display several commercial applications in a wide spectrum of industries, such as food, pharmaceutical and cosmetic. In an effort to further understand the lipid composition of macroalgae, the present work reports, for the first time, the isolation and characterization of the polar lipid profile of the red macroalgae Porphyra dioica cultivated on a land-based integrated multi-trophic aquaculture (IMTA) system, using a lipidomic-based approach employing hydrophilic interaction liquid chromatography-eletrospray ionization mass spectrometry (HILIC-ESI-MS). The fatty acid profile of this species of seaweed was also determined, accounting for season variability and its life cycle. The polar lipid profile of P. dioica revealed the presence of over 69 molecular species, corresponding to glycolipids (sulfoquinovolsyldiacylglycerols, sulfoquinovosylmonoacylglycerols, digalactosyldiacylglycerols) and glycerophospholipids (lyso- and phosphatidylglycerols), lyso- and phosphatidylcholines), as well as phytyl derivatives. Some of these polar lipids contain polyunsaturated fatty acids (PUFAs), namely arachidonic acid (C20:4) and eicosapentaenoic acid (C20:5), thus revealing the ability of P. dioica to biosynthesize this long chain PUFAs. P.dioica from the winter season revealed to be richer in PUFA content, accounting for 37.0% of total fatty acid (TFA) content, as opposed to P. dioica from the summer season (25.0% of TFA content). Eicosapentaenoic acid (EPA) content was revealed to be being significantly higher in the winter season (25.2% of TFA content). The diploid sporophyte conchocelis phase of P. dioica showed to possess the highest amount of PUFAs (47.0% of TFA content), with arachidonic acid being the most abundant fatty acid (21.2% of TFA content). Several of the lipids identified have been reported to possess nutritional and health benefits, thus allowing the valorisation of P. dioica from IMTA as a source of bioactive compounds, adequate for the use in a wide range of different applications and as a functional food, rich in omega-3 fatty acids.
As macroalgas têm vindo a ganhar um interesse cada vez maior para o uso em diversas aplicações biotecnológicas, devido ao valor acrescentado dos seus diferentes constituintes. Entre estes, os glicolípidos e os fosfolípidos podem ser usados comercialmente em diferentes indústrias, tais como as indústrias alimentar, farmacêutica e cosmética. Com o objetivo de compreender melhor a composição lipídica das macroalgas, o presente trabalho relata, pela primeira vez, a caracterização do perfil de lípidos polares da macroalga vermelha Porphyra dioica, cultivada num sistema de aquacultura multi-trófica integrada (IMTA), utilizando para esse fim uma abordagem lipidómica baseada na espectrometria de massa (HILIC-ESI-MS). Foi também determinado o perfil de ácidos gordos da referida espécie de alga, tendo em consideração a variabilidade sazonal e o seu ciclo de vida. O perfil de lípidos polares da alga P. dioica revelou a presença de mais de 69 espécies moleculares diferentes, correspondendo a classes de glicolípidos (sulfoquinovosildiacilgliceróis, sulfoquinovosilmonoacilgliceróis e digalactosildiacilgliceróis), fosfolípidos (liso- e fosfatidilglicerol, liso- e fosfatidilcolinas) e derivados fitil. Alguns destes lípidos polares contêm ácidos gordos polinsaturados (PUFAs) na sua composição, nomeadamente o ácido araquidónico (C20:4) e ácido eicosapentaenóico (C20:5), revelando, assim, a capacidade da alga P. dioica em biossintetizar este tipo de ácidos gordos polinsaturados de cadeia longa. Considerando a variação sazonal do conteúdo em ácidos gordos, a P. dioica cultivada no inverno revelou ser mais rica em PUFAs, correspondendo a 37.0% do conteúdo total de ácidos gordos, contrariamente à P. dioica cultivada no verão (25.0%). O conteúdo em ácido eicosapentaenóico (EPA) é significativamente maior na estação de inverno (25.2%). O perfil em ácidos gordos também variou com o ciclo de vida P. dioica, sendo que na fase de conchocelis a quantidade de PUFA é significativamente mais elevada (47.0% de conteúdo de ácidos gordos), sendo o ácido araquidónico o ácido gordo mais abundante (21.2% de conteúdo de ácidos gordos).Várias classes de lípidos polares foram identificados como possuindo benefícios nutricionais e para a saúde, permitindo assim a valorização da alga vermelha P. dioica produzida em IMTA como uma fonte de compostos bioativos, adequados para o uso numa grande variedade de aplicações como um alimento funcional, rica em ácidos gordos polinsaturados ómega-3.
Lecerf, Adrien. "Ordre et variation : essai sur le système de Jamblique". Thesis, Paris, EPHE, 2015. http://www.theses.fr/2015EPHE5071.
Pełny tekst źródłaThis thesis strives to provide modern research with a synthesis of the system of Iamblichus of Chalcis, an important figure in the development of later Greek metaphysics. It reconstructs in turn his psychology, his hierarchy of being and some of his most basic concepts and philosophical laws, with a stress on the continuity between Plotinus, founder of the Neoplatonic school, and the beginnings of the school of Athens. The whole of Iamblichus’ body of work is exploited, as well as the 800 fragments and testimonia on his life and doctrine handed down to us by later authors. Influences received are analysed and set in context: Plotinus’ and Porphyry’s Neoplatonism, which provides the general levels of reality which Iamblichus tried to analyse and enrich; Middle Platonism, whose topics are debated in Neoplatonism; Aristotelianism, which accounts for a dynamic conception of the human soul and a hierarchy of cognitive powers beginning with the transcendent Intellect; Pythagoreanism, which allows Iamblichus to depict mathematics as a universal language, able to take the mark of all parts of philosophy. By the scope of his work and the originality and neatness of the solutions he provided to problems which nascent Neoplatonism had to confront, Iamblichus is able to create a powerful synthesis which acts as a doctrinal basis for the later schools of Athens and Alexandria: it is profoundly representative of a theocentric era, in which human soul is but a derived principle that has to keep its place in the grand scheme of being. It is a metaphysics of unity, founded on the dual dynamic of order and variation
Church, S. "The Chester porphyria". Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382053.
Pełny tekst źródłaInnala, Eva. "Acute intermittent porphyria, women and sex hormones. Screening for hepatocellular carcinoma in porphyria". Doctoral thesis, Umeå universitet, Obstetrik och gynekologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-36884.
Pełny tekst źródłaWimmershoff, Frank. "Porphyria cutanea urämica Unterschiede zwischen Hämodialysepatienten mit und ohne Porphyria cutanea-artigen Hautveränderungen /". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972391541.
Pełny tekst źródłaLi, Yang. "Geochronology and fluid evolution of the Qulong porphyry system : implications for porphyry deposit formation". Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11869/.
Pełny tekst źródłaOng, Patricia Mei Lin. "Pathophysiology of acute intermittent porphyria". Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318116.
Pełny tekst źródłaHolley, Ann E. "Studies on experimental hepatic porphyria". Thesis, University of Surrey, 1987. http://epubs.surrey.ac.uk/847524/.
Pełny tekst źródłaMeissner, Peter Nicholas. "Enzyme studies in variegate porphyria". Thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/25672.
Pełny tekst źródłaPizarro, Martínez Héctor Orlando. "Les traceurs minéralogiques comme indicateurs de porphyres cuprifères dans les remplissages sédimentaires des bassins adjacents, désert d'Atacama, Chili". Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30105.
Pełny tekst źródłaPorphyry copper deposits (PCDs) are linked to calk-alkaline magmatism produced in a convergent tectonic margin and resulted from the circulation of hydrothermal fluids derived from oxidized and water rich felsic magmas emplaced at shallow depths. During the evolution of the magmatic and hydrothermal systems, the fluid-rock interaction generates typical hydrothermal alteration minerals and can also modify or generates accessories minerals with different properties that can be associated at each stage of the evolution of the system, which could be distinguished by the physico and geochemical characteristics of the inherited accessory minerals (zircon), the modified minerals (apatite) or the newly formed minerals (Fe-Ti oxides). In the Atacama Desert hydrographic basins exposed along the western forearc are filled by gravel deposits which were derived from the erosion of the Domeyko Cordillera in response to the Eocene Incaic tectonic phase. It can be hypothesized that some of these basins contain mineralogical evidences that come from the denudation of porphyry copper mineralized systems located upstream. Therefore, the main goal of this thesis is to find magnetic, mineral and chemical evidences that will help to link the denudation of PCDs with sediments deposited in adjacent basins, mainly by using heavy minerals and magnetic signals as tracers contained in the sedimentary record. To test this relationship, I compare the rock-magnetic properties and physical and geochemical characteristics of minerals (zircon and apatite) in four selected DPCs located in Domeyko Cordillera (Chuquicamata, Mirador, Esperanza and Escodida), with the same characteristics in detrital sediment filling a close basin in the Centinela Mining District. In the studied PCDs, accessory minerals with distinctive physical and geochemical characteristics associated with metallogenic fertility were identified. In zircons, the most fertile samples correspond to these geochemical signatures: Hf > 8,750 (ppm), Eu/Eu* > 0.4, 10.000 x (Eu/Eu*)/Y > 1, (Ce/Nd)/ Y > 0.01, Dy/Yb < 0.3, Th/U < 1 - > 0.1), which can be linked to high oxidation state and high content of magmatic water in the magma. In apatite, the most relevant features indicating fertility are the green luminescence color and high Ca values and low content of trace elements, such as Mg, Na, Cl, which can be related to the evolution of hydrothermal fluids. Although the magnetic signal from DPCs is controlled by the presence of Fe-Ti oxides of hydrothermal and magmatic origin, their characteristics could not be used to differentiate the contribution of these two components. In the stratigraphic record there is a gravel deposit (Tesoro) which contains an important number of zircons and apatite which can be signaled as indicators of metallogenic fertility, that coincides with exotic-Cu mineralization and abundant clasts coming from different hydrothermal alteration zones related to PCDs. In the gravel deposits, a decrease in the magnetic susceptibility values from lower to upper levels is observed, which is mainly controlled by coarse-grain Fe-Ti oxides concentration of detritic origin. In the gravel deposits, rock magnetic properties are mainly controlled by Fe-Ti oxides concentration of detritic origin, where the highest concentration of Fe-minerals could be associated to arid climatic conditions and a rapid tectonically-controlled denudation, whereas the decline in concentration can be related to an aridification trend and/or sources changes
Wessendorf, Florian. "Supramolecular fullerene-porphyrin architectures = Supramolekulare Fulleren-Porphyrin-Architekturen". kostenfrei, 2010. http://d-nb.info/1000613593/34.
Pełny tekst źródłaBeavington, Richard. "Porphyrin arrays". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388909.
Pełny tekst źródłaPromarak, Vinich. "Porphyrin arrays". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249614.
Pełny tekst źródłaZhang, Wei. "Porphyrin arrays". Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494395.
Pełny tekst źródłaHift, R. J. "Variegate porphyria : molecular aspects of variegate porphyria in South Africa and their biochemical and clinical consequences". Doctoral thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/3398.
Pełny tekst źródłaVariegate porphyria (VP) is the clinical disorder associated with a deficiency of the haemsynthesising enzyme protoporphyrinogen oxidase (PPO). VP is one of the commonest monogenic inherited disorders in South Africa. The clinical effects include photocutaneous sensitivity and the development of potentially life-threatening acute porphyric crises. Section 1 of this dissertation examines the molecular basis for VP in South Africa.
Tannert, Sebastian. "Energy and electron transfer in porphyrin-phthalocyanin-porphyrin heterotrimers". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16850.
Pełny tekst źródłaThis thesis contributes to the comprehension of energy and electron transfer within novel supra-molecular structures, denominated triads, consisting of a central phthalocyanine axially-coupled to two porphyrins. In the course of this thesis, two of the trimers, were quantitatively characterized regarding their intramolecular transfer processes. Both feature a dative bond between the porphyrins and the phthalocyanine via the central silicium atom of the latter. These investigations aimed at answering whether this class of compounds allows the desired combination of light harvesting and charge separation. The rate constants of both investigated trimers in two solvents with different polarity were determined by the combination of data from a variety of measurement methods. An efficient charge transfer from the porphyrins to the phthalocyanine and a hole transfer from the phthalocyanine to one of the porphyrins occurs in all investigated cases. This result confirms the prospect that light harvesting and charge separation can occur combined in one molecule. Depending on solvent polarity and the structure of the porphyrines, electron transfer parallel to the energy transfer and a charge back transfer takes place in addition to both above-mentioned processes. However, the charge-separated state of the investigated substances decays to fast, still preventing a practical utilization of these compounds in solar cells and necessitating further developments.
Rappé, Charles J. "Porphyry and the Platonic-Aristotelian tradition". [S.l. : s.n.], 2002. http://www.freidok.uni-freiburg.de/volltexte/599.
Pełny tekst źródłaMcFall, Katie Anne. "Critical metals in porphyry copper deposits". Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/412122/.
Pełny tekst źródłaAndré-Mayer, Anne-Sylvie. "Fluides et fracturations dans les gisements de type porphyre et épithermal". Nancy 1, 2000. http://www.theses.fr/2000NAN10176.
Pełny tekst źródłaIn metallogeny, it is now obvious that fluids are the main vectors of metals and that fluids and deformations are closely associated in the mineralizing processes. This work deals about this two main aspects in the porphyry and epithermal environment. Fluid studies, realised in the epithermal district of Shila (SW Peru), allow to state a mineralizing model at the district scale. The differences observed in the PVT properties of the fluids seem to explain the different types and styles of mineralization. At Apacheta, studies of the vertical evolution of the physico-chemical parameters of the fluids in parallel to the mineralization show that differences, observed between deep levels (Pb-Zn) and shallower levels (AuAg), is directly linked to a fractionation of gases present in fluids during a boiling event. The geochemistry (crush-leach) of the fluids associated to this type of mineralization in various districts (Shila, Pero; Baia Mare and Apuseni Moutains, Romania; Pongkor, Indonesia) are similar whatever their geodynamic context and are comparable with the fluids associated to geothermal systems. Analyses of fracture networks has been realised at macroscopic scale on different (mineralized or not) vein systems. They allow in a first time to establish a new methodology to characterize paleostresses taking into account the influence of the fluid pressure. Applied on the Soultz-sous-Forêts vein system, this method gives realistic paleostress magnitudes linked to the reopening of quartz veins. The mineralized stockwerk of the Rosia Poieni porphyry copper (Apuseni Mts, Romania) has been chosen for a statistical and hydraulic characterization in order to understand how mineralized vein system evolve and grow. A 1D sampling of the stockwerk has been realized on 2000 fractures distributed on five levels of the open pit (910, 940, 1000, 1045 and 1060 ml. Various statistical analyses has been applied and heterogeneities observed in the stockwerk (metric scale) express directly variations in the copper content. Statistical description of the stockwerk properties seems thus to be a very powerful prospective tool. Estimation of hydraulic conductivities developed by veins has been realized and show equally heterogeneities at the quarry scale. The mean permeability developed by all the veins on each profile decrease from the deeper and more mineralized level (910m) to the highest level (1060m). High permeabilities developed on the 910 m profile are linked to the presence of major drains and the clustered organization of veins. The level 1060 m, characterized by numerous and thin veins with a homogeneous spatial repartition, develop a more pervasive permeability
Panton, Nicola. "Mutation analysis of four genes implicated in iron homeostasis in porphyria cutanea tarda (PCT) patients". Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/888.
Pełny tekst źródłaValencia, Victor A. "EVOLUTION OF LA CARIDAD PORPHYRY COPPER DEPOSIT, SONORA AND GEOCHRONOLOGY OF PORPHYRY COPPER DEPOSITS IN NORTHWEST MEXICO". Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1085%5F1%5Fm.pdf&type=application/pdf.
Pełny tekst źródłaDickinson, Jenni Michelle. "Jura-triassic magmatism and porphyry Au-Cu mineralization at the Pine Deposit, Toodoggone District, North-central British Columbia". Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/3959.
Pełny tekst źródłaPuig-Pichuante, R. M. "Molybdeunum mineralization with emphasis on porphyry systems genesis and exploration". Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1006840.
Pełny tekst źródłaPiché, David. "Le problème des universaux dans l'Isagoge de Porphyre selon quelques commentateurs latins du XIIIe siècle (Pseudo-Robertus Anglicus, Jean le Page, Nicolas de Paris et Robert Kilwardby) : édition critique sélective, traduction française, analyses structurelle et formelle et étude historico-philosophique". Doctoral thesis, Université Laval, 2002. http://hdl.handle.net/20.500.11794/42828.
Pełny tekst źródłaFraunberg, Mikael von und zu. "Molecular genetics of variegate porphyria in Finland". Helsinki : University of Helsinki, 2003. http://ethesis.helsinki.fi/julkaisut/laa/kliin/vk/fraunberg/.
Pełny tekst źródłaJones, Liza T. "Nitrogen dioxide sensing using porphyrin and porphyrin-calixarene hybrid LB films". Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397502.
Pełny tekst źródłaAlemán, Elvin A. "PHOTOCHEMISTRY AND PHOTOPHYSICAL CHARACTERIZATION OF PORPHYRIN & N-CONFUSED PORPHYRIN DYADS: PORPHYRIN PHOTOPHYSICAL PROPERTIES AND ELECTRON AND ENERGY TRANSFER". University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1161633478.
Pełny tekst źródłaLampadaridi, Anna. "La Vie de Porphyre de Gaza par Marc le Diacre (BHG³ 1570) : Édition critique, traduction, commentaire". Thesis, Paris 4, 2011. http://www.theses.fr/2011PA040140.
Pełny tekst źródłaThe Life of Porphyry of Gaza (BHG³ 1570) is a hagiographical text of the protobyzantine period written by Mark the Deacon. He introduces himself as the saint’s loyal disciple, who narrates his master’s life after his death in 420. However, due to the plagiarism of Theodoret of Cyrrhus’s Philotheos History, the current form of the Vita dates certainly later than 444 and cannot have been written by Mark, who is just the narrator. According to the hypothesis of the editors Grégoire and Kugener, the current form of the Vita is the result of the revision of an older text. The text provides us with a unique account of the history of paganism and christianism in Gaza at the end of the 4th and the beginnings of the 5th century. Appointed bishop of Gaza in 395, Porphyry contributes actively to the christianisation of the city, which was largely pagan. The peak of his activity is the demolition of the Marneion and the erection of the “Great Church” of Gaza on the site of the former temple. However, in addition to the problems concerning its authorship and its datation, the Vita was found in the centre of a great debate concerning its historical value since the time of Tillemont. In the frame of our PhD thesis, we undertook a new critical edition, accompanied by a french translation. The brief literary study of the text is followed by a historical commentary guided by the problem of the Vita’s authenticity. The critical edition is preceded by an examination of the direct and the indirect text tradition. Finally, the notes of the translation aim to reveal its documentary value
Huh, Min-Jun. "Le premier commentaire de Boèce à l’Isagogè de Porphyre : introduction, traduction et commentaire". Thesis, Paris 4, 2013. http://www.theses.fr/2013PA040145.
Pełny tekst źródłaOur thesis in two volumes aims to give an original French translation of Boethius’s first commentary on Porphyry’s Isagoge based on the critical edition published by Samuel Brandt in 1906. Actually, Boethius commentary deals with the Latin translation of Marius Victorinus and not, as the title seems to suggest, with the greek treatise of Porphyry. The first volume contains a general introduction divided into four parts : a critical studies of the secondary sources; the material sources of the Boethian first commentary on Isagoge; the Boethian analysis of Porphyry’s three questions about universals; and Marius Victorinus’ Isagoge and the Latin rhetorical tradition. The thesis we defend in the introduction can be summarized as follows : Porphyry’s lost commentary on Categories (Ad Gedalium) may have been the main source of the first Boethian commentary on Isagoge ; historically, the three questions on universals had been related to the Porphyrian refutation of anti-Aristotelian position of Plotinus ; and, unlike Victorinus which considers Isagoge as an introduction to Cicero’s Topica, Boethius adopts the Neoplatonic perspective which makes it an introduction to Aristotle’s Categories. This introduction is followed by the French translation accompanied by the latin text edited by Brandt. Our commentary on the Boethian treatise is developed in the second volume, which also contains an original French translation of Ammonius’ commentary on Porphyry’s Isagoge and a full refutation of the thesis supported by Brandt in his prolegomena to his critical edition about the textual parallels attested in the Boethian and Ammonian commentaries on Isagoge (cf. appendix 1 and 2)
Du, Plessis Nelita. "Analysis of genetic variants in the 5' regulatory region of the ALAS1 gene in South African patients with variegate porphyria (VP) /". Thesis, Link to online version, 2007. http://hdl.handle.net/10019/420.
Pełny tekst źródłaHori, Takaaki. "Studies on giant porphyrin wheels and on aggregation behavior of porphyrin family". 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120685.
Pełny tekst źródłaSteyn, Ilse. "Investigation of the possible influences of candidate modifier genes on the clinical expression of variegate porphyria (VP)". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52896.
Pełny tekst źródłaENGLISH ABSTRACT: Variegate porphyria (VP, MIM 176200) is a low penetrance autosomal dominant disorder that stems from mutations in the protoporphyrinogen oxidase (PPOX) gene. VP is found in most populations, but has a high prevalence in the South African Afrikaner population with most patients inheriting the same PPOX mutation (R59W) from a common ancestor. The clinical manifestations of the disease include acute neurovisceral attacks and/or cutaneous photosensitivity. Great variation in the clinical presentation of VP is observed; even in members of the same family that share a common genetic background and that have been exposed to similar environmental factors. Candidate genes that may have an influence on phenotypic variation due to the regulatory function in the haem biosynthetic pathway include the two deltaaminolevulinic acid synthase (ALAS) genes and the porphobilinogen deaminase (PBGD) gene. Sequence homology searches between different species indicated that the ALAS-1, ALAS-2 and PBGD genes are highly conserved, indicating that these genes have an important function to fulfill in the haem biosynthetic pathway. The study population of 25 R59W individuals were divided in four categories according to their clinical presentation. The distribution of clinical symptoms observed in this study corresponds with results from previous studies. Conformation sensitive gel electrophoresis (CSGE), conventional single stranded conformation polymorphism analysis (SSCP) and two buffer SSCP analysis were implemented to screen for possible sequence variants. The exons of all three genes as well as the adjacent intronic sequences were investigated. A total of six sequence variation sites were identified of which five had previously been described single nucleotide polymorphisms (ALAS-1: 4713 T>C; PBGD: -64 C>T, 3581 A>G, 6479 G>T, 7064 C>A)] and a novel 8bp deletion (PBGD: 4582_ 4589del). No sequence variant was identified in the ALAS-2 gene. The CSGE method proved to have the highest sensitivity (83%), identifying five of six sequence variant sites. The conventional SSCP method identified only three (50%) sequence variant sites, while the two buffer system detected two (33%) of the sequence variants. The 4713 T>C SNP in exon 4 of the ALAS-1 gene and the -64 C>T SNP in the PBGD gene were selected for further investigation due to their location in the respective genes. These sequence variants were typed in 50 patients and 50 control subjects matched for ethnic background. The relationship between variation at these loci and clinical features was investigated. No statistical significant association was observed for either of the 4713 T>C SNP (P= 0.717) or the -64 C>T SNP (P= 0.931). Genetic modifying factors make a variable contribution to the total clinical picture and are difficult to identify in small populations. Due to the fact that we only had a limited number of VP samples, association cannot be ruled out. This study does, however, provide insight into investigational approaches that should be undertaken in future research concerning the ALAS and PBGD genes. Further knowledge concerning the haem biosynthetic pathway could ultimately lead to the understanding and assessment of the clinical expression observed in individuals with VP.
AFRIKAANSE OPSOMMING: Variegate porfirie (VP, MIM 176200) is 'n lae penetrasie outosomaal dominante siekte wat veroorsaak word deur mutasies in die protoporfirienogeen oksidase (PPOX) geen. VP word gevind in die meeste populasies, maar het 'n hoë voorkoms in die Suid- Afrikaanse populasie waar meeste pasiente dieselfde PPOX mutasie (R59W) van 'n gemeenskaplike voorouer oorgeërf het. VP word gekenmerk deur akute neuroviserale aanvalle en/of fotosensitiewe vel. Groot variasie word egter waargeneem in die kliniese uitdrukking van VP, selfs in lede van dieselfde familie wat 'n gemeenskaplike genetiese agtergrond deel en wat blootgestel is aan dieselfde omgewingsfaktore. Kandidaat gene wat as gevolg van hulle regulatoriese funksie in die heem biosintetiese padweg 'n effek op die ekspressie van VP mag hê, sluit in die twee deltaaminolevuliniese suur sintase (ALAS) en die porfobilinogeen deaminase (PBGD) gene. Homologie ondersoeke van die ALAS-1, ALAS-2 en PBGD gene in verskillende spesies dui daarop dat die gene hoogs gekonserveerd is en dus gevolglik 'n belangrike funksie in die heem biosintetiese padweg vertolk. Die studie populasie van 25 R59W individue is verdeel in vier kategorieë op grond van hulle kliniese simptome. Die verspreiding van die kliniese simptome wat waargeneem is tydens hierdie studie stem ooreen met die resultate van vorige studies. Konformasie sensitiewe gel elektroforese (CSGE), konvensionele enkelstring konformasie polimorfisme analise (SSCP) en twee buffer SSCP analise is gebruik vir die identifisering van genetiese variasie. Die eksons van al drie gene, sowel as die aangrensende intron volgordes, is ondersoek. 'n Totaal van ses areas van genetiese variasie is geïdentifiseer, waarvan vyf reeds beskryfde polimorfismes is (ALAS-1: 4713 T>C; PBGD: -64 C>T, 3581 A>G, 6479 G>T, 7064 C>A) en 'n nuwe 8bp delesie (PBGD: 4582_ 4589del). Geen genetiese volgorde variasie is gevind in die ALAS-2 geen nie. Die CSGE metode het die hoogste sensitiwiteit getoon (83%) en het vyf van die ses volgorde variasies geïdentifiseer. Die konvensionele SSCP metode het slegs drie volgorde variasies geïdentifiseer (50%), terwyl die twee buffer deteksie-sisteem twee variasies geïdentifiseer (33%) het. Die 4713 T>C polimorfisme in ekson 4 van die ALAS-1 geen en die -64 C>T polimorfisme in die PBGD geen, is geselekteer vir verdere ondersoek as gevolg van hulle posisie in die respektiewe gene. Die volgorde variasies is getipeer in 50 R59W pasiënte sowel as in 'n kontrole groep van 50 individue met dieselfde etniese agtergrond. Die verband tussen die variasie by die lokusse en die kliniese kenmerke is ondersoek. Geen statisties beduidende assosiasie is waargeneem vir hetsy die 4713 T>C SNP (P= 0.717) of die -64 C>T SNP (P= 0.931). Genetiese modifiserende faktore word moeilik geïdentifiseer in klein populasies omdat hulle afsonderlike bydra tot die geheelbeeld van die kliniese simptome so varieerbaar is. 'n Relatiewe klein groep van VP pasiënte was tydens die studie beskikbaar en dus kan assosiasie nie uitgesluit word nie. Die studie verskaf egter insig in verband met toekomstige benaderings wat volg kan word in verdere ondersoeke van die ALAS en PBGD gene. Verdere kennis in verband met die heem biosihtetiese padweg kan uiteiHdelik lei tot die verduideliking en assesering van die kliHiese uitdrukking in vI=' individue.
Herrick, Ariane L. "Studies of the pathogenesis and treatment of acute intermittent porphyria". Thesis, University of Aberdeen, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327839.
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