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Dissertations / Theses on the topic 'Natural Origin'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Ringbom, Therese. "Bioassay Development for Identification of Cyclooxygenase-2 Inhibitors of Natural Origin." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2002. http://publications.uu.se/theses/91-554-5276-0/.

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2

Shirley, Neil John. "Synthesis of compounds of natural and unnatural origin by intramolecular alkylations." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phs558.pdf.

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3

Akhter, Shaheen. "The provenance variation in natural durability of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)." Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367387.

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4

Felth, Jenny. "Studies of Cytotoxic Compounds of Natural Origin and their Mechanisms of Action." Doctoral thesis, Uppsala universitet, Avdelningen för farmakognosi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-148114.

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Cancer incidence is increasing and novel anticancer drugs with new mechanisms of action are essential for future chemotherapeutic treatment. Natural products have historically played an important role in the development of anti-cancer drugs and have potential to do so also in the future. In this thesis two classes of natural products are identified as possible drug lead candidates, and the mechanisms of their action are elucidated. Initially, in a screening of a compound library for cytotoxic effects in colon cancer cells, natural products with potent activity were identified. Based on their p

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Sowder, Jonathan T. "The origin and fate of arsenic in coalbed natural gas produced water ponds." Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1935323111&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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6

Borgini, Matteo. "Synthesis and biological evaluation of chemotherapeutic macrocycle derivatives of natural and synthetic origin." Doctoral thesis, Università di Siena, 2020. http://hdl.handle.net/11365/1094596.

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Viene riportata la sintesi e la caratterizzazione biologica ed anti-proliferativa di derivati della molecola naturale Largazolo in grado di rilasciare ossido nitrico e di fornire un effetto antitumorale duale nei confronti di alcune linee cellulari tumorali. Inoltre, è riportato l'approccio sintetico utilizzato per lo scale-up della molecola antifungina BM1 per la quale sono stati condotti test di farmacocinetica e di tossicità.

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Moddaresi, Mojgan. "The Use of Nanotechnology in Enhancing the Efficacy of Cosmetic Products of Natural Origin." Thesis, University of the Arts London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521850.

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Bustos, Salgado Paola. "Biopharmaceutical study of therapeutic efficacy of nanostructured formulations made from products of natural origin." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/673940.

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This research work was aimed at the characterization in vitro, ex vivo and in vivo of nanostructured systems which independently contain a natural flavanone extracted from Eysenhardtia platycarpa and another four flavanones obtained through semi-synthesis of the first flavanone with the objective of providing evidence of their efficaciousness as anti-inflammatory cutaneous agents. Initially the flavanone was isolated from its natural source, and following on from this, the derivatives were obtained through chemical reactions of acetylation, methylation, cyclization and vinyl cyclization. Calcu

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9

Das, T. "Insights into messy chemistry related to cosmology and origin of life obtained by employing state-of-the-art computational methods." Thesis(Ph.D.), CSIR-National Chemical Laboratory, 2021. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/5987.

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How life began on the early earth, as well as how small molecules and ions were first formed at the beginning of the universe are some of the biggest unsolved questions in science that have intrigued researchers over time. However, no clear answers have yet been received for researchers in the fields of cosmology, prebiotic chemistry, interstellar chemistry as well as astrochemistry. From previous studies, it has become clear that the creation of the universe and the origin of life are not the result of any single event. Rather, they are likely the product of highly complex or “messy” chemical

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Nobajas, i. Ganau Alexandre. "Bottled natural mineral water in Catalonia: Origin and geographical evolution of its consumption and production." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/110466.

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Bottled mineral water has managed to become a commodity and can be found virtually anywhere in the world. However, even if it is a very common and well recognized product, little it is known about its history, about how, when and why it came to be. The origins of bottled water can be found in mid-19th century Europe and America, when spas started selling their waters outside their facilities. However, soon other springs which had not relation with traditional hydrotherapy started bottling their waters as well. Four conditionings have been found which explain why bottled water started being pro

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11

Pankewitz, Florian. "Unusual natural products in insects molecular and chemical analyses of anthraquinone origin in Galerucini leaf beetles /." kostenfrei, 2007. http://www.diss.fu-berlin.de/2007/20/index.html.

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12

Maelzer, Michael B. "An investigation into the chemical nature and mechanism of action of antiviral compounds of natural origin." Thesis, University of Brighton, 2010. https://research.brighton.ac.uk/en/studentTheses/6bbce562-2bd7-4d33-8c96-764edd375b2f.

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The research described in this thesis concerns the antiviral activity of constituents found in a pomegranate rind extract, PRE, from the husk of the fruit of Punica granatum L., as has been described by Stewart et al., (1998). To investigate the mode of action, to identify the active molecule responsible for the activity and to establish a bioassay that can be used to test for antiviral activity of plant extracts were the main points of concern.

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13

Schulz-Rojahn, J. P. "Origin, evolution and controls of Permian reservoir sand stones in the Southern Cooper Basin, South Australia." Title page, abstract and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs389.pdf.

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Thesis (Ph. D.)--University of Adelaide, National Centre for Petroleum Geology & Geophysics (NCPGG) /Dept. of Geology & Geophysics, 1993.<br>At head of title: "NERDDC/SENRAC Research Project." Three folded maps in pocket. Two microfiches in pocket. Includes bibliographical references (leaves 155-187).

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14

Wayman, John. "Identification of the natural history and origin of Barrett's oesophagus and adenocarcinoma of the oesophago-gastric junction." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327232.

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Andrus, Nicole Genet. "The origin, phylogenetics and natural history of darwiniothamnus (Asteraceae: Astereae), an endemic shrub of the Galapagos Islands." FIU Digital Commons, 2002. http://digitalcommons.fiu.edu/etd/1290.

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Darwiniothamnus (Asteraceae:Astereae), one of seven plant genera endemic to the Galipagos Islands, has until recently had an unknown origin, number of species, and conservation status. The purpose of this master's thesis was to determine the origin and phylogenetics of Darwiniothamnus and to outline the major ecological factors influencing the survival of this genus. Material for this thesis was sequenced from the ITS (Internal Transcribed Spacer) region of 18-26S nuclear ribosomal DNA of putative sister taxa from South, Central and North America, Mexico and the Caribbean. A molecular phylogen

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16

Zhang, Xinming. "Biomimetic assembly of reactive units for the total synthesis of marine natural products from dual biosynthetic origin." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS318.

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Le manuscrit de thèse traite de la synthèse totale de molécules naturelles de structures particulièrement intrigantes. Deux familles de molécules naturelles issues du monde marin ont été ciblées dans ce travail : les halichonadines et les araiosamines.- La famille des halichonadines nous plongent dans le domaine des terpènes d’origine marine. Isolées d’éponges du genre Halichondria, deux structures ont particulièrement retenues notre attention : les halichonadines K et L. En effet, non seulement, ces deux molécules complexes contiennent une partie terpénique de type eudesmane (halichonadine C,

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Cannon, Nathaniel S. "Domain Duplication, Darwinian Selection, and the Origin of the Globulin Seed Storage Proteins." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1544.

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The seed storage globulins found among virtually all spermatophytes comprise a multi-gene family of proteins with ancient evolutionary origins. The two main groups of storage globulins include the legumins (11S) and vicilins (7S), both of which play a main role in protein deposition and storage in the seed endosperm. Composed of two cupin domains (bicupin), these proteins have been recently noted not only for their close structural relationships among the two subfamilies (7S and 11S) but also for their similarity to other proteins such as germin-like proteins (GLP's), bacterial oxalate decarbo

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Wilson, Nicola Dawn. "The application of near infrared spectroscopy to the characterisation and quality control of pharmaceutical materials of natural origin." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274461.

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19

Karlsson, Jamous Christoffer. "Shaken by the stress : Does in-uterus earthquake exposure cause long-term disadvantages for the fetus?" Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415152.

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This study investigates whether in-uterus earthquake exposure causes long-term labor, human capital, and health effects. The health shock is maternal stress, which generates excessive concentration levels of cortisol in the fetal environment, negatively impacting the development of the fetus. I use multiple earthquakes between the years 1960-1980 in the setting of Colombia. In my definition of earthquake exposure, I consider both the intensity and the extent of the shaking. Difference-in-difference estimates show mixed results. I find a higher likelihood of being disabled when exposed during t

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Jerden, James L. "Origin of Uranium Mineralization at Coles Hill Virginia (USA) and its Natural Attenuation within an Oxidizing Rock-Soil-Ground Water System." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29173.

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Development of a scientific basis for management of uranium bearing wastes and contaminants requires information from natural geologic systems. The following study of the Coles Hill uranium deposit and associated weathered zone constrains processes leading to the natural attenuation of uranium within an oxidizing, fluid rich environment typical of the eastern US. At the Coles Hill deposit fracture hosted, primary U(IV) bearing mineral assemblages formed during hydrothermal activity associated with Mesozoic faulting. The most abundant ore assemblage consists of coffinite and apatite, but urani

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21

Mansoor, Ramla. "Do herbicide effects on Odonata larvae, depend on their location of origin? : An ecotoxicological study using Glyphosate." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-36163.

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Concentrations of herbicides in our aquatic ecosystems increase more and more. Among these, the herbicide glyphosate is the most common one. This ecotoxicological study was performed in order to examine the toxic effect of the herbicide glyphosate on aquatic invertebrates. Odonata were selected as study organisms in order to serve as bio-indicators of environmental contamination. Two populations, each of two species (Erythromma najas and Libellula quadrimaculata) were collected from four different locations, to study inter-specific differences, as well as, differences among populations within

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22

GUILBOT, Kelly. "Determination of dioxins in Cretaceous strata from the South of Sweden. : Can the environmental anthropogenic pollutant dioxin be of natural origin ?" Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-25916.

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Eleven sediment samples from different geological layers and four fossils from the South of Sweden were collected and estimated to be 80 million years old (approximately late of Cretaceous period). The samples were analyzed for polychlorinated dibenzo-p dioxins (PCDD/Fs) to investigate whether these samples are likely to contain dioxins from a natural formation. For over thirty years, the scientific community has discussed the possibility of a natural formation of dioxins. Several hypothesis have been put forward, but often rejected by the evidence of a source of anthropogenic pollution in the

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Cajahuanca, Atencio Jakelin Arisely, Córdova Margarita Isabel Contreras, Sánchez Enrique Filomeno Gomez, Estrada Lissbeth Eugenia Ruiz, and Soto Cynthia Alejandra Vizcarra. "Salsa Jayay." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652254.

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El consumo per cápita de ají fresco en el Perú es de 4.75 Kg al año, según datos de la Asociación de Exportadores (ADEX) en el 2017, esto representa un incremento en comparación a años anteriores, el cual está relacionado con el boom de la gastronomía peruana que incentiva el uso de ajíes en pastas o salsas en los últimos años. Además, esta tendencia de crecimiento también se refuerza gracias a las actividades realizadas por MINAGRI, esta entidad pública promueve la producción y consumo interno del ají por medio de mecanismos que dan a conocer la diversidad, usos, beneficios del ají peruano y

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Sousa, Pedro Manuel Fialho de 1939. "A estereotomia da pedra-tradição, persistência e continuidade em Portugal." Phd thesis, Instituições portuguesas -- UTL-Universidade Técnica de Lisboa -- -Faculdade de Arquitectura, 1988. http://dited.bn.pt:80/29755.

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25

Benatrehina, Paule Annecie. "Identification and Isolation of Secondary Metabolites from Podocarpus neriifolius Using Bioactivity-Guided and 1D-NMR-Based Dereplication Approaches." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu153193675651081.

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Hankison, Shala J. "The role of natural and sexual selection in the origin and maintenance of divergence within and between the Mexican sailfin mollies, Poecilia velifera and P. petenensis." Connect to this title online, 2006. http://etd.lib.clemson.edu/documents/1171042685/.

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27

Koulaouzidis, George. "Investigation of the origin of the coronary artery calcification process and its relationship to the atherosclerotic cardiovascular disease." Doctoral thesis, Umeå universitet, Institutionen för folkhälsa och klinisk medicin, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-83450.

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The objectives of this thesis are: a) To examine racial/ethnic differences in coronary artery calcification (CAC) and CAD, between symptomatic South Asians and Caucasians, matched for age, gender and conventional cardiovascular risk factors, b) To assess, using a meta-analysis model, the natural history of and stability of measurements of coronary artery calcium scoring (CACs) based on data collected from two large published trials: St Francis and EBEAT, c) To investigate the prevalence of coronary artery calcification in individuals with CT evidence for AVC, mitral valve calcification (MAC) o

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SCHIEPATTI, ANNALISA. "STUDY OF THE CLINICAL AND MOLECULAR PHENOTYPE AND NATURAL HISTORY OF ENTEROPATHIES WITH VILLOUS ATROPHY OF UNKNOWN ORIGIN AND THERAPEUTIC POTENTIAL OF BONE MARROW DERIVED MESENCHYMAL STEM CELLS." Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1329191.

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This PhD project started in 2016 and aimed firstly to define the clinical and molecular phenotype and natural history of enteropathies with villous atrophy of undefined etiology, that need to be clearly distinguished from both coeliac disease, its complications and other non-coeliac enteropathies with villous atrophy due to a known cause. Secondly, we aimed to evaluate the therapeutic potential of mesenchymal stem cell infusions for the treatment of these rare conditions. The main clinical part of this PhD project (February 2018-August 2019) has been carried out in collaboration with the NHS E

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Westley, Chantel Barbara, and chantel westley@flinders edu au. "The distribution, biosynthetic origin and functional significance of Tyrian purple precursors in the Australian muricid Dicathais orbita (Neogastropoda: Muricidae)." Flinders University. Biological Sciences, 2008. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20090414.153942.

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Information on the biosynthetic origin and functional advantage of marine mollusc natural products is not only essential to our understanding of chemical ecology, but to the development and responsible production of therapeutic agents. As demonstrating in situ activity is methodologically hindered, functions inferred by in vitro activity have been assumed for many secondary metabolites. The anatomical and ontogenetic distribution of natural products can not only provide information on the biosynthesis and storage of metabolites, but identify selective pressures likely to affect survivorship at

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Logardt, Ulrika. "What factors are influencing domestic purchasers in their purchase of imported low-involvement products due to the products' country-of-origin? : - A case study of a natural stones importer." Thesis, Umeå universitet, Företagsekonomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-97832.

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The author has applied an abductive research design and performed a case study which includes a survey and e-mail interviews of workers within the construction industry. The purpose of the survey and the interviews is to investigate what factors may be the most influential for individuals in establishing their apprehension of natural stones. The research has been made on commission of the case firm which is a natural stones importer located in Sweden and the survey is based on the 17-point CETSCALE originally created by Shimp and Sharma in 1987. The survey was sent to workers with different oc

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Finati, E. "MELATONIN: A PLEIOTROPIC MOLECULE OF NATURAL ORIGIN. EVALUATION OF THE DIFFERENT THERAPEUTIC ACTIVITIES IN ANIMAL MODELS AND / OR HUMAN PATIENTS AND A STUDY OF THE METABOLIC-BIOCHEMICAL PATHWAYS RELATED TO THEM." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/217462.

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1.0. ABSTRACT Background Melatonin (MLT), a pineal gland hormone, seves as a bioclock and bio-calendar to mediate many receptor- or non-receptor functions. In addition to its immunomodulatory and neurological effects, MLT has a relevant oncostatic activity especially with respect to breast and prostate cancers, but the mechanism of action is still unclear. The growth of androgen-independent LNCaP prostate cancer cells has been demonstrated to be inhibited by MLT both in vitro and in vivo in a nude mice xenograft model. Clearly, the oncostatic effects of MLT may not be related to a single fu

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Tremel-Schaub, Anne. "Transfert du thallium du sol vers la plante : caractérisation du risque dans les agrosystèmes." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_TREMEL_A.pdf.

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Le thallium (Ti) est un métal toxique pour lequel il était nécessaire d'acquérir des connaissances sur la probabilité et les conséquences du transfert du sol vers la plante, afin de caractériser le risque dans les agrosystèmes. L’étude a été réalisée successivement au champ, en vases de végétation et en hydroponie. La concentration en Ti médiane de 244 horizons supérieurs de sols agricoles est 0,29 mg Ti. Kg-1 ms et le 1 et le 9 déciles sont 0,13 et 1,54 mg Ti. Kg-1 ms. De fortes concentrations d'origine pédo-géochimique, jusqu'a 55 mg Ti. Kg-1 ms ont été observées, mais aucune pollution anthr

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Almeida, Filho Enézio Eugênio de. "A natureza das críticas de Mivart ao papel da seleção natural de Darwin na origem das espécies: uma reconsideração histórica da controvérsia." Pontifícia Universidade Católica de São Paulo, 2008. https://tede2.pucsp.br/handle/handle/13405.

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Made available in DSpace on 2016-04-28T14:16:36Z (GMT). No. of bitstreams: 1 Enezio Eugenio de Almeida Filho.pdf: 4288341 bytes, checksum: 6d7c3e5e0f23728ac321058b96f617c8 (MD5) Previous issue date: 2008-10-17<br>Discovery Institute - Center for Science and Culture<br>This research follows the line of History and Theory of Science that has as a goal to explain the construction of scientific thought by discussing the foundation of hypotheses and theories within their historical contexts. The goal of this thesis is to analyze Mivart´s critiques and Darwin´s answers, and to verify if they wer

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Kappes, Contreras Rodrigo Andrés. "Evaluación de la gestión de riesgos en tres ciudades intermedias de Chile." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/114795.

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Geógrafo<br>Se realiza una evaluación, para comparar el desarrollo de la gestión de riesgos de origen natural en tres ciudades intermedias, basándose en los modelos desarrollados por CARDONA (2006) y por CASTRO et al (2010) respectivamente. Las ciudades evaluadas y comparadas a través del modelo diseñado corresponden a Caldera, La Serena y Pichilemu, las tres localizadas en la costa, de atractivo turístico y que se encuentran afectadas por más de una amenaza de origen natural, siendo Pichilemu la única afectada directamente por el último terremoto que afectó al territorio chileno en 2010. El

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Abe-Matsumoto, Lucile Tiemi. "Ácido elágico em alimentos regionais brasileiros." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/9/9131/tde-06102017-180612/.

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O ácido elágico é um composto fenólico responsável por diversas atividades biológicas tais como antioxidante e/ou anticarcinogênica e está presente algumas frutas e nas nozes. As bagas, mais conhecidas como berries e a romã são as fontes mais conhecidas de ácido elágico, porém, não são alimentos usualmente consumidos na dieta brasileira. Desta forma, o objetivo deste trabalho foi realizar um screening em frutas e sementes em relação aos seus teores de ácido elágico e a partir do screening, selecionar uma fruta para estudo dos teores de ácido elágico durante sua maturação. Um total de 35 varied

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Clark, Richard. "An investigation of multiple natural origins of religion." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/27803.

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This study attempts to trace how religion could have originated in prehistory and antiquity, out of natural human and prehuman behaviour, without requiring the reality of the supernatural. Other views of what religion is being set aside, religion is here defined as <i>beliefs conceptions, practices and roles concerned with the putative supernatural. </i>A variety of manifestations or <i>elements</i> of religious belief and practice can be identified It is proposed that <i>they have separate origins. </i>Examples of <i>religious elements </i>are: life after death, ghosts, sacrifice, priests, sh

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Domínguez, Gómez María Jesús. "Efectos de la materia prima y el proceso secado-maduración sobre la calidad del jamón curado." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/160042.

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[ES] La materia prima es un elemento clave en cualquier proceso de transformación alimentaria, ya que de su composición y cualidades dependerá el producto final. En el caso del jamón, el origen de la materia prima, puede proceder de sistemas ganaderos convencionales, donde la producción es intensiva y la alimentación está basada en piensos comerciales. En el caso de cerdos procedentes de ganadería ecológica, los animales están sujetos a las condiciones marcadas por la normativa europea de producción ecológica, donde se respeta el medio ambiente y el bienestar animal. Para el caso de figuras de

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Álvarez, Bercedo Paula. "Síntesis estereoselectivas de lactonas y compuestos espiroacetálicos de origen natural." Doctoral thesis, Universitat Jaume I, 2008. http://hdl.handle.net/10803/384548.

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La Tesis titulada Síntesis estereoselectivas de compuestos lactónicos y espiroacetálicos de origen natural y desarrollada por Paula Álvarez Bercedo ha consistido en la síntesis total de los siguientes productos naturales: 1. Síntesis estereoselectiva de la estructura asignada al producto natural feigrisólido A, lo que ha permitido corregir la estructura no sólo del feigrisólido A y del feigrisólido B, demostrando que sus éstas coinciden con las de los ácidos nonáctico y homononáctico, respectivamente. 2. Síntesis enantioselectiva los espiroacetáles aculeatinas A, B, y D. 3. Síntesis enanti

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Salazar, Karina Josefina Malquichagua. "Cromenos de origem policetídica em Peperomia villipetiola." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-26082016-100643/.

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Estudo fitoquímico dos extratos de folhas e galhos de Peperomia villipefiola (\"hierba de la plata\"), coletada no Peru, resultou no isolamento e caracterização da miristicina (3-metoxi-4,5-metilenedioxi-alil-benzene) e sete novos cromenos. Os cromenos tiveram suas estruturas elucidadas através de análises espectroscópicas como sendo: 5-hidroxi-7-metil-2,2-dimetil-2H-1-cromeno-6-carboxilato de metila (PVL1), 7-metil-5-metoxi-2,2-dimetil-2H-1-cromeno-8-carboxilato de metila (PVL2), 7-hydroxy-5-metil-2,2-dimetil-2H-1-cromeno-6-carboxilato de metila (PVL3), 5-metil-7-metoxi-2,2-dimetil-2H-1-crome

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LONGO, TOMMASO. "NATURA E CULTURA: ALLE ORIGINI DI UNA DICOTOMIA." Doctoral thesis, Università degli Studi di Milano, 2018. http://hdl.handle.net/2434/563262.

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ABSTRACT Nature (φύσις) and (νόμος) are two key terms of a long-standing debate in ancient Greek philosophy. My dissertation is chiefly concerned with the ways the concept of “culture” (νόμος) is related with that of “nature” (φύσις) in the history of ancient ethical and political thought. In particular, it aims to reconstruct and assess the historical-philosophical path leading to the formulation of the dichotomy between φύσις and νόμος in the Sophistic debate. On purpose, my dissertation is divided, as to the structure, into three main parts: 1. the first chapter is entirely dedi

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Kolesnikov, Anton. "Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27017.

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The theory of the abyssal abiotic petroleum origin considers oil and natural gas to begenerated in the Earth’s upper mantle. Hydrocarbons migrate further through the deep faults into the Earth’s crust, where they can form oil and gas deposits in any kind of rock in any kind of structural position. Until recently one of the main obstacles for further development of this theory has been the lack of the data covering processes of generation and transformations of hydrocarbons. Experimental data, presented in this thesis, confirms the possibility of hydrocarbons formation from mantle inorganic com

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Oliver, Ortega Helena. "Materiales compuestos de una poliamida de origen renovable y fibras naturales de alto rendimiento: una sólida alternativa a los materiales compuestos de polipropileno reforzados con fibra de vidrio." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/664067.

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The main goal of this thesis is the production and characterization of composites materials from a bio-based polyamide and natural fibres which could be more sustainable alternative to glass fibre reinforced polypropylene. The produced composites materials were mechanically characterized and their properties modelled. The thermal,thermomechanical properties and the structure of the composites were analyzed due to the low degradation temperature of the natural fibres similar to the processing temperatures of the composites materials. Moreover, the fibres could have an influence on the structure

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Gonzales, Olivares Miguel Ángel. "Dispersión de minerales de origen natural y sintético en diferentes líquidos." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2004. http://cybertesis.uni.edu.pe/uni/2004/gonzales_om/html/index-frames.html.

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Rojas, Silva Santisteban Herbert. "Concreto reforzado con fibra natural de origen animal (plumas de aves)." Bachelor's thesis, Universidad Ricardo Palma. Programa Cybertesis PERÚ, 2009. http://cybertesis.urp.edu.pe/urp/2009/rojas_h/html/index-frames.html.

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Reynolds, Alexander E. "On the Origin of Natural Antibody." Diss., 2016. http://hdl.handle.net/10161/12228.

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<p>Natural IgM (nIgM) is constitutively present in the serum, where it aids in the early control of viral and bacterial expansions. nIgM also plays a significant role in the prevention of autoimmune disease by promoting the clearance of cellular debris. However, the cells that maintain high titers of nIgM in the circulation had not yet been identified. Several studies have linked serum nIgM with the presence of fetal-lineage B cells, and others have detected IgM secretion directly by B1a cells in various tissues. Nevertheless, a substantial contribution of undifferentiated B1 cells to nIgM tit

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Barros, Alexandre António Antunes. "Biodegradable urological stent systems based on natural origin polymers." Doctoral thesis, 2017. http://hdl.handle.net/1822/48674.

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Tese de Doutoramento (Programa Doutoral em Engenharia de Tecidos Medicina Regenerativa e Células Estaminais)<br>Ureteral stents are one of the most commonly used devices in urological practices. Ureteral stents are used for temporary or permanent relief of ureteral obstruction to maintain the flow of urine through the ureter after urological surgical procedures or in case of intrinsic or extrinsic obstruction. Nonetheless, they are related with common problems including encrustation, infection, pain and discomfort. As these problems restrict optimal stent function, including maintenance o

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Silva, Ana Rita Almeida Calixto. "The origin of the catalytic power of enzymes." Doctoral thesis, 2018. https://hdl.handle.net/10216/115766.

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Silva, Ana Rita Almeida Calixto. "The origin of the catalytic power of enzymes." Tese, 2002. https://repositorio-aberto.up.pt/handle/10216/115766.

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Tuzlakoglu, K. "Fiber-based structures from natural origin polymers for tissue engineering approches." Doctoral thesis, 2008. http://hdl.handle.net/1822/7633.

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Tese de doutoramento em Ciência e Tecnologia de Materiais - Área de Biomateriais.<br>Tissue engineering is a new concept emerged as an alternative approach to tissue and organ reconstruction. It differs from organ transplantation by regenerating patient’s own tissue and organs avoiding the biocompatibility and low biofunctionality problems as well as severe immune rejection; which are the main problems of organ transplantation. Tissue engineering methods generally require the use of three main components: a porous scaffold that serves as a matrix, cells and growth factors. The architectu

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Harington, Alexis. "The role of natural selection in the endosymbiotic origin of organelles." Thesis, 2015. http://hdl.handle.net/10539/16723.

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