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Dissertations / Theses on the topic 'Natural plants'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Mati, Evan. "Natural Dyeing Plants in Kurdistan, Iraq." Thesis, Uppsala universitet, Systematisk biologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-141816.

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2

Sorichetti, Riccardo. "Natech QRA in natural gas processing plants." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Natural calamities as floods, earthquakes or lightning strikes might lead to major accidents in chemical, petrochemical and process facilities. Such natural-technological events are termed as Natech events and occurred several times in the past. In the present study, a methodology for the quantitative risk assessment (QRA) of Natech scenarios triggered by floods, earthquakes and lightning based on the extension of the scheme used for conventional risk assessment is presented. However, specific steps and specific models and tools were required to extend the conventional QRA procedure to Natech

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3

Samarasekera, Jayaneththi. "Insecticidal natural products from Sri Lankan plants." Thesis, Open University, 1997. http://oro.open.ac.uk/19785/.

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This thesis describes investigations of the insecticidal compounds of three Sri Lankan plants, <i>Pleurostylia opposita</i> (Wall) Alston (Celastraceae), <i>Aegle marmelos</i> Correa (Rutaceae) and <i>Excoecaria agallocha</i> Linn. (Euphorbiaceae). After establishing the insecticidal activity of the extracts of three plants, separation of compounds was achieved by bio-assay directed chromatography, and the compounds were characterised by NMR especially 2D experiments, mass, UV and IR spectroscopy. Three new macrocyclic sesquiterpene polyol ester alkaloids 1, 2 and 3 containing a novel 6,7 ring

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4

Payne, Katharine. "Natural genetic variation in caesium accumulation by plants." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415498.

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5

Haroon, Iqbal. "Medicinal plants : a natural alternative to prophylactic antibiotics." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706984.

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The thesis evaluates the potential of traditional herbal medicines as an alternative to prophylactic antibiotic use in livestock. Two areas are explored 1) The immunomodulatory potential of medicinal herbs 2) The antimicrobial potential of medicinal herbs. The thesis identifies the importance of the Malvacea family and its potential in stimulating the TH1 mediated immune system, which has previously been shown to be suppressed in livestock due to abiotic and biotic stress factors. Additionally a preliminary screen identified the potential of plants exhibiting antimicrobial activity. The abilit

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6

Case, Olivia Hildegard. "An assessment of medicinal hemp plant extracts as natural antibiotic and immune modulation phytotherapies." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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This study aimed to evaluate the antimicrobial efficacy of medicinal hemp plant extracts to determine the antibacterial effects of indigenous Sansevieria species and exotic Cannabis sativa phytotherapy varieties. This study also assessed whether aqueous o

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7

Petrenko, Olga. "Simulation of flowering plants." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0067/document.

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Les plantes ont longtemps intrigué les scientifiques, qui, avec son importance vitale pour la planète, sa beauté et l'énorme quantité de formes ayant, les rend un sujet attrayant pour la recherche. Un aspect intéressant est la création d'un modèle virtuel capable de simuler de vraies plantes avec un degré élevé de précision. L'objectif de notre étude est les plantes à fleurs, qui jouent un rôle énorme dans notre vie de fins nutritives et médicales à l'embellissement de l'environnement . L'obtention d'un modèle géométrique exacte d'une fleur est très utile, car elle joue un rôle important dans

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8

Domingos, Vanessa David [UNESP]. "Crescimento de Brachiaria subquadripara (Trin.) Hitchc. sob diferentes condições nutricionais e monitoramento sazonal de fatores ambientais no habitat natural." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/99961.

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Made available in DSpace on 2014-06-11T19:30:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-06-22Bitstream added on 2014-06-13T19:40:02Z : No. of bitstreams: 1 domingos_vd_dr_botfca.pdf: 881718 bytes, checksum: 163d5eca87ea73603bb65511b1b32209 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este estudo teve como objetivo avaliar o crescimento e caracterizar o ambiente de ocorrência de Brachiaria subquadripara, sendo constituído de três etapas: (i) avaliar a população e os fatores abióticos presentes no reservatório de Barra Bonita em duas épocas (se

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9

Braly, S. Katharine. "Environmental variables influencing sexual reproduction of sea oats, Uniola paniculata (Poaceae) across a natural dune field on Bear Island, North Carolina." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/r1/bralys/sbraly.pdf.

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10

Maoela, Manki Sarah. "Studies on some biologically active natural products from Tulbaghia Alliacea." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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It is believed that early humans had knowledge of how to use traditional medicinal plants, but the knowledge has been partially lost as society underwent various changes leading to new civilizations. The aim of this study was to isolate and identify natural product constituents from Tulbaghia Alliacea. There has not yet been any scientifically conducted investigation on the plant. Tulbaghia Alliacea is used for fever and colds, asthma, pulmonary tuberculosis and stomach problems.

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11

Campbell, Lesley Geills. "Rapid evolution in a crop-weed complex (Raphanus spp.)." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1166549627.

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12

Yatsuda, Regiane. "Avaliação da atividade anti-carie dos compostos bioativos isolados das plantas Mikania laevigata Schultz Bip. ex Baker e Mikania glomerata Sprengel." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288520.

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Orientadores: Pedro Luiz Rosalen, Hyun Koo<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-07T01:21:21Z (GMT). No. of bitstreams: 1 Yatsuda_Regiane_D.pdf: 2220152 bytes, checksum: af7c550978d5b4b9b4ba19a84d7cb6c0 (MD5) Previous issue date: 2006<br>Resumo: O uso de plantas medicinais vem crescendo nos últimos anos e isto é devido principalmente as descobertas de suas propriedades biológicas, e entre estas plantas destacam-se as do gênero Mikania. Assim, a procura pela descoberta de novos produtos naturais c

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13

Avendaño, Gil Gianfranco Emilio, Durand Daniel Antonio Bazán, Fajardo Rodrigo Alonso Maza, Bustamante Juan Diego Ochoa, and Paredes Maria Elizabeth Torres. "Fertilizante Natural: Agro Dust." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/652428.

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El presente proyecto se basa en la producción y comercialización de fertilizante natural y biodegradable, que sirve como bio-estimulante para las plantas ornamentales, teniendo como valor adicional ser un retenedor de agua de riego durante 20-21 días aplicando una sola vez el producto. Elaborado a base de cáscara de naranja y palta, nuestro negocio va dirigido a habitantes de Lima Moderna correspondientes a los estilos de vida conservador, moderno y sofisticado que posean plantas y/o pequeños jardines pertenecientes a los niveles socioeconómicos (NSE) A, B y C, además de mostrar preocupación p

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14

Wissman, Jörgen. "Grazing regimes and plant reproduction in semi-natural grasslands /." Uppsala : Department of Conservation Biology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200640.pdf.

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15

Holm, Karl. "Studies on Natural Variation and Evolution of Photoperiodism in Plants." Doctoral thesis, Uppsala universitet, Evolutionär funktionsgenomik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-119269.

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Photoperiodism refers to the organism’s ability to detect and respond to seasonal changes in the daily duration of light and dark and thus constitutes one of the most significant and complex examples of the interaction between the organism and its environment. This thesis attempts to describe the prevalence of variation in a photoperiodic response, its adaptive value, and its putative genetic basis in a common cruciferous weed, Capsella bursa-pastoris (Brassicaceae). Furthermore, the thesis presents a first comprehensive comparative overview of the circadian clock mechanism in an early land pl

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16

COLLU, MARTA. "Endocannabinoid System Modulation By Natural Products From Ancient Medicinal Plants." Doctoral thesis, Università degli Studi di Cagliari, 2019. http://hdl.handle.net/11584/260056.

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Herbal drugs have been important for the treatment of multiple pathological conditions since ancient times. A multitude of historical texts document the importance of plant-based therapies, but the therapeutic effectiveness of many described applications remains questionable. Concomitantly, the pharmacological properties and the associated chemistry of many herbal drugs described in ancient texts remain poorly studied. The development of modern pharmacology and analytical tools in the past century has led to the discovery of a plethora of novel plant-derived compounds and propelled advancement

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17

Wang, Wen-Bohr. "Optimization of expander plants /." Access abstract and link to full text, 1985. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8520757.

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18

Ko, Yuen-yi, and 高婉儀. "Synthetic studies of (-)-curcumol and its related natural products." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31245420.

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19

Morrell, B. G. "Vanadium uptake and transport in higher plants." Thesis, Liverpool John Moores University, 1986. http://researchonline.ljmu.ac.uk/5580/.

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The uptake and transport of vanadium in several higher plant species has been examined. Studies utilizing excised Hordeum roots have revealed the uptake patterns of two different ionic species of vanadium (V02+ and V03) to be similar. Both ionic forms exhibited a large extracellular component in their uptake. This extracellular component was shown to be exchangeable with a number of agents but was most effectively removed by a post uptake treatment in a solution of chromium(VI). This removal of extracellular vanadium by chromium was considered to be a genuine exchange process although the mech

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20

Begg, Fiona H. "Anthropogenic '1'4C in the natural (aquatic) environment." Thesis, University of Glasgow, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300458.

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21

Domingos, Vanessa David 1978. "Crescimento de Brachiaria subquadripara (Trin.) Hitchc. sob diferentes condições nutricionais e monitoramento sazonal de fatores ambientais no habitat natural /." Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/99961.

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Orientador: Dagoberto Martins<br>Banca: Robinson Antonio Pitelli<br>Banca: Eduardo Andrea Lemus Erasmo<br>Banca: Mario Sergio Tomazela<br>Banca: Sidnei Roberto de Marchi<br>Resumo: Este estudo teve como objetivo avaliar o crescimento e caracterizar o ambiente de ocorrência de Brachiaria subquadripara, sendo constituído de três etapas: (i) avaliar a população e os fatores abióticos presentes no reservatório de Barra Bonita em duas épocas (seca e águas); (ii) seleção da solução nutritiva (solução base) favorável ao crescimento a partir de diferentes diluições (80, 60, 40, 20 e 0%) da solução nut

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22

Essack, Magbubah. "Screening extracts of indigenous South African plants for the presence of anti-cancer compounds." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8767_1210844967.

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<p>Early man dabbled with the use of plant extracts to cure ailments. This practice has been passed down from generation to generation and today more than 50% of the world'sdrugs are natural products or derivatives thereof. Scientists have thus established a branch of research called natural product research. This branch of research involves the identification and purification of secondary metabolites with a specific biological activity. The methodology involves the screening of plant products for a specific biological activity, purification of the biologically active natural product by separa

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23

Furbacher, Todd Raymond. "Bioassay-guided isolation of potential antineoplastic natural products from Southwestern plants." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279927.

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This dissertation details the investigation of numerous plants for potential antineoplastic compounds. 144 plants (391 extracts) were prescreened with an assortment of assays. The pre-screens included an Agrobacterium tumefaciens/potato disk gall tumor inhibition assay, a Saccharomyces cerevisiae mutant topoisomerase assay, and an Escherichia coli plasmid scission assay. Bioassay-guided fractionation was conducted on three plants, Phoradendron juniperinum, Psorothamnus thompsoniae , and Acourtia thurberi, using a different assay for each. Phoradendron juniperinum (Viscaceae) was screened with

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24

BERSANO, ANDREA. "Analysis of natural circulation and passive systems phenomenology in nuclear plants." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2829632.

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25

Peters, Jeffrey C. "Pattern and impact of disease in natural plant communities of different age." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239131.

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26

Wangchuk, Phurpa. "Bioactive alkaloids from medicinal plants of Bhutan." Thesis, Department of Chemistry - Faculty of Science, 2004. http://ro.uow.edu.au/theses/315/.

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Natural products had been indispensably used by many cultures and traditions in folklore medicines for thousands of years. These traditional medicines cater to about 85% of the world population for their primary health care needs. Natural products have been intensively explored also for their bioactive pharmacophores by modern pharmaceutical companies. In fact they are the skeletal framework of about 60% of the modern drugs that are available today. Of these, about 80% of antibacterial drugs and 90% of antimalarial drugs are natural derivatives. One of the interesting secondary metabolite grou

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Wangchuk, Phurpa. "Bioactive alkaloids from medicinal plants of Bhutan." Department of Chemistry - Faculty of Science, 2004. http://ro.uow.edu.au/theses/315.

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Natural products had been indispensably used by many cultures and traditions in folklore medicines for thousands of years. These traditional medicines cater to about 85% of the world population for their primary health care needs. Natural products have been intensively explored also for their bioactive pharmacophores by modern pharmaceutical companies. In fact they are the skeletal framework of about 60% of the modern drugs that are available today. Of these, about 80% of antibacterial drugs and 90% of antimalarial drugs are natural derivatives. One of the interesting secondary metabolite grou

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28

Blume, Christian [Verfasser]. "Glycolate and glyoxylate metabolism in higher plants : how natural and artificial pathways contribute to plant metabolism / Christian Blume." Hannover : Technische Informationsbibliothek (TIB), 2013. http://d-nb.info/1130810666/34.

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29

Schievenin, Dimitrio Fernandes 1989. "Regeneração natural sob talhões puros de espécies nativas com diferentes atributos funcionais /." Botucatu, 2016. http://hdl.handle.net/11449/138942.

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Orientador: Vera Lex Engel<br>Banca: Antonio Carlos Galvão de Melo<br>Banca: Giselda Durigan<br>Resumo: A facilitação e a inibição da regeneração natural por plantações florestais já foram demonstradas em regiões tropicais. Os mecanismos de facilitação e a influência das espécies plantadas na trajetória do sistema em regeneração, no entanto, ainda não estão completamente elucidados. Objetivou-se neste estudo investigar se, a partir das características funcionais das espécies do dossel, há diferenças nos processos de colonização do sub-bosque. O estudo foi realizado na região central do Estado

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Krzysiak, Amanda J. "The isolation and characterization of natural products from marine plants and microorganisms /." Electronic version (PDF), 2006. http://dl.uncw.edu/etd/2006/krzysiaka/amandakrzysiak.pdf.

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Sibandze, G. F. "Antimicrobial and efflux inhibiting activity of natural products from Swazi medicinal plants." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10041384/.

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Plant-derived medicines have played a major role in the history of man, especially as anti-infective agents. In the wake of the emergence of multidrug-resistant microbial infections, natural products are still a potential source of drug leads since they contain a wide array of structurally diverse compounds. Alongside the classical approach of finding anti-infective agents, this study also sought to investigate the potential of Swazi medicinal plants as efflux inhibitors in bacterial cell systems. This is because bacteria utilise the efflux system to avert the inhibitory action of antibiotics

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32

Wang, Ming. "Isolation and Structure Elucidation of Antiproliferative and Antiplasmodial Natural Products from Plants." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73742.

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As part of an International Cooperative Biodiversity Group (ICBG) program and a collaborative research project with the Natural Products Discovery Institute, four plant extracts were investigated for their antiproliferative and antiplasmodial activities. With the guidance of bioassay guided fractionation, two known antiproliferative terpenoids (2.1 and 2.2) were isolated from Hypoestes sp. (Acanthaceae), four known antiplasmodial liminoids (3.1-3.4) were isolated from Carapa guianensis (Meliaceae), one inactive terpenoid (4.1) was isolated from Erica maesta (Ericaceae), and four cerebrosides (

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Lima, Maria dos Prazeres Rodrigues de. "Combined effects of chemical and natural stressors to soil organisms and plants." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14766.

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Doutoramento em Biologia<br>Nas últimas décadas, a Terra tem experimentado um aquecimento global e mudanças nos padrões de precipitação. Muitos estudos sobre a avaliação de risco de agrotóxicos em organismos não-alvo foram realizados com base em protocolos padronizados, com condições abióticas controladas. Mas, em campo, os organismos são expostos a flutuações de vários fatores ambientais, bem como a poluentes, que podem alterar os limites de tolerância dos organismos aos stressores naturais, bem como alterar a toxicidade ou biodisponibilidade do químico em causa. Considerando isso, o principa

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Altemimi, Ammar Badran. "ULTRASONIC APPLICATIONS- PHYTOCHEMICAL ANALYSES OF SOME MEDICINAL NATURAL PRODUCTS IN FOOD PLANTS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/dissertations/1149.

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There are concerns about using synthetic phenolic antioxidants such as butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) as food additives because negative effects to human health have been reported. thus, a replacement of these synthetics by antioxidant extractions from various foods has been proposed. By the generation of more than eight thousand different phenolics, fruits and vegetables are the prime sources of natural antioxidants. The consumption of fruits and vegetables has been strongly linked with several health benefits, a result of their medicinal properties and high

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35

Muwanga, Catherine. "An assessment of Hypoxis hemerocallidea extracts, and actives as natural antibiotic, and immune modulation phytotherapies." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3303_1184589097.

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<p>In South Africa, the crude aqueous extract from Hypoxis hemerocallidea is used by AIDS patients to treat opportunistic infections, such as tuberculosis. The rapid emergence of multidrug-resistant tuberculosis, and extreme drug resistant tuberculosis, in recent years, is a major threat to human health. The treatment of TB, nosocomial bacterial infections, and fungal infections is now a clinical challenge, especially in the immuno-compromised individual. There is a dire need for novel antibiotic alternatives with phytotherapies and plant-derived compounds as potentially promising alternatives

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Tang, Lam T. "New routes to heterocyclic product families." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365338.

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Sandlin, Melissa C. "Model-based vision-guided automated cutting of natural products." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17931.

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Foster, Kennith E., N. Gene Wright, and Susan Fitzgerald Fansler. "Guayule Natural Rubber Commercialization: A Scale-Up Feasibility Study." Office of Arid Lands Studies, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/303352.

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Conducted under USDA Agreement No. 58-3159-7-11 Guayule Natural Rubber Program<br>Introduction: The United States imports 100 percent of its natural rubber. Ninety-two percent of our natural rubber production is concentrated in Southeast Asia, which is subject to interruptions through political action or direct military intervention. Natural rubber, a critical and strategic material, is necessary in such articles as aircraft and ground vehicle tires, medical supplies, resilient mounts, and certain acoustical applications. Synthetic elastomers cannot meet performance requirements in these areas

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Mbaebie, Oyedemi B. O. "Antiplasmid and antimicrobial activities of synthetic and natural products from selected medicinal plants." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1468641/.

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This PhD thesis is part of ongoing project to identify plant natural products and selected synthetic compounds that possess antimicrobial properties; and are able to promote plasmid loss or interfere with bacterial conjugation. The conjugative broad host plasmids investigated include PKM101 (Inc N), TP114 (Inc I2), PUB307 (Inc P), and low- copy number plasmids: R6K (Inc X), R7K (Inc W) and R1-drd-19 (Inc F11). They represented the incompatibility plasmid groups that are currently associated with gross dissemination of antibiotic resistance in bacteria. A series of plant extracts evaluated at s

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Williams, Russell B. "Searching for Anticancer Natural Products From the Rainforest Plants of Suriname and Madagascar." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29861.

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Through the ICBG (International Cooperative Biodiversity Group) program and a continuing search for anticancer compounds, plant extracts were obtianed from Suriname and Madagascar and screened for cytotoxic activity in the A2780 human ovarian cancer cell line. Fractionation of a leaf and flower extract of Casearia nigrescens led to the isolation of six new clerodane diterpenes. Four were new natural products and the other two were previously unreported hydrolysis products. Their structures were determined using mass spectrometry and 1-D and 2-D NMR. All six compounds were cytotoxic in th

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Presley, Christopher Charles. "Isolation, Structure Elucidation, and Total Synthesis of Biologically Active Natural Products from Plants." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/79978.

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As a part of the continuing search for bioactive compounds with the Madagascar International Cooperative Biodiversity Group (ICBG), and in collaboration with the Natural Products Discovery Institute of the Institute for Hepatitis and Virus Research (IHVR), thirteen plant extracts were investigated for antiplasmodial activity, thirteen plant extracts were investigated for antiproliferative activity, and one extract was investigated for inhibitors of the shikimate pathway in Plasmodium falciparum. Bioassay-guided fractionation of the extracts led to the identification of nineteen compounds with

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Bergquist, Jacqueline M. "The development of a natural disaster planning template for use in plant collections management." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 135 p, 2009. http://proquest.umi.com/pqdweb?did=1889024481&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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43

Guiher, Sara Nicole. "A Regional Management Strategy for Invasive Plants in the Oak Openings." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1503607896706064.

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Magalhães, Alessandra. "Perfil etnobotânico e conservacionista das comunidades do entorno da reserva natural Serra das Almas, Ceará - Piauí, Brasil." reponame:Repositório Institucional da UFC, 2006. http://www.repositorio.ufc.br/handle/riufc/15724.

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MAGALHÃES, Alessandra. Perfil etnobotânico e conservacionista das comunidades do entorno da reserva natural Serra das Almas, Ceará - Piauí, Brasil. 2006. 68 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Pró-Reitoria de Pesquisa e Pós-Graduação, Programa Regional de Pós-Graduação em Desenvolvimento e Meio Ambiente - PRODEMA, Fortaleza-CE, 2006.<br>Submitted by demia Maia (demiamlm@gmail.com) on 2016-03-23T12:50:56Z No. of bitstreams: 1 2006_dis_amagalhães.pdf: 1794297 bytes, checksum: 8ede621dcb215bae53dc46c6ae9d1b08 (MD5)<br>Approved for entry into archive by demia Maia(demiamlm

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Yoder, Brent Jason. "Isolation and Structure Elucidation of Cytotoxic Natural Products from the Rainforests of Madagascar and Suriname." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29756.

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As part of an ongoing investigation of new bioactive metabolites from rainforest flora, extracts from five different plants were determined to have interesting compounds that were new and/or cytotoxic. These phytochemicals were isolated by various separation techniques and then characterized by common spectroscopic methods. A bark extract of a Tambourissa species yielded a new hydroxybutanolide with moderate cytotoxicity. The long hydrocarbon chain in this molecule is unique, and its structure was determined by various NMR techniques. A fruit extract from Macaranga alnifolia yielded four n

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Mello, Felipe Nery Arantes. "Padrões da comunidade de trepadeiras e suas relações com a biomassa arbórea e a regeneração natural em uma Floresta Estacional Semidecidual em Piracicaba, SP: implicações no manejo de fragmentos florestais degradados." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-14122015-113743/.

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Devido ao histórico processo de exploração e conversão do uso do solo, as florestas tropicais hoje se encontram altamente fragmentadas e com os remanescentes de vegetação sobre constante pressão, como é possível observar para Florestas Estacionais Semideciduais do Estado de São Paulo. O aumento na frequência e intensidade de fatores de perturbação em pequenos fragmentos florestais pode ocasionar uma proliferação desequilibrada de plantas trepadeiras que acabam por contribuir com a degradação florestal iniciada pelas perturbações. Isto se reflete na crescente demanda por resolução de problemas

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MagalhÃes, Alessandra. "Perfil etnobotÃnico e conservacionista das comunidades do entorno da reserva natural Serra das Almas, CearÃ - PiauÃ, Brasil." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2151.

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O presente trabalho consiste diagnÃstico de plantas com usos terapÃuticos e caracterizaÃÃo do perfil de comunidades sobre a conservaÃÃo da flora nativa do entorno da Reserva Natural Serra das Almas, CE e PI, Brasil. Para isto, investigou-se diversos aspectos como:o perfil sÃcio-econÃmico-cultural das comunidades; o repasse do conhecimento etnobotÃnico entre as sucessivas geraÃÃes; as informaÃÃes etnobotÃnicas relativas ao uso das plantas medicinais, dados relativos ao perfil epidemiolÃgico das comunidades; o comÃrcio de plantas em Ãrea urbana; e sobre a existÃncia de uma preocupaÃÃo do ponto d

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Osorio, Adriana de Carvalho. "Controle de qualidade do extrato fluido e tintura de guaco (Mikania glomerata Sprengel)." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-13012015-101303/.

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O guaco (Mikania glomerata Sprengel) é uma planta medicinal brasileira empregada em medicamentos para tosse e problemas respiratórios. Devido ao interesse que esta espécie desperta e a popularidade de sua utilização estão sendo realizados estudos fitoquímicos e farmacológicos. O objetivo deste trabalho foi desenvolver metodologia para o controle de qualidade do extrato fluido e tintura desta planta, a partir da escolha de uma substância marcadora - a cumarina (1,2-benzopirano), e pesquisar um método de doseamento preciso, exato e de fácil execução. Primeiramente, testou-se o método da A.O.A.C.

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Vergne, Matheus Carvalho. "A família Lauraceae Juss. na Reserva Natural Vale, Linhares - ES e chave interativa de identificação de múltiplas entradas para as suas espécies /." Rio Claro, 2016. http://hdl.handle.net/11449/144293.

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Orientador: Pedro Luís Rodrigues de Moraes<br>Banca: João Batista Baitello<br>Banca: Flávio Macedo Alves<br>Resumo: Foi realizado um tudo taxonômico das espécies de Lauraceae que ocorrem na Reserva Natural Vale em Linhares, ES, localizada ao norte do Estado, dentro do domínio fitogeográfico Mata Atlântica. Foram analisados os espécimes de Lauraceae coletados na Reserva Natural Vale que se encontram depositados nos herbários CVRD e HRCB, totalizando ca. 700 exsicatas. Como resultado do trabalho, foram registradas na Reserva Natural Vale, 54 espécies distribuídas em 14 gêneros, a saber: Aiouea (

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Stump, Simon Maccracken. "Natural Enemies in a Variable World." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560856.

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Natural enemies are ubiquitous in nature. In many communities, natural enemies have a major effect on the diversity of their prey. Their effects are very diverse: they can promote or undermine the ability of their prey to coexist through a variety of mechanisms. As such, an important step in understanding how diversity is maintained will be to understand how different forms of predator behavior affect prey coexistence. In this dissertation, I study how two major types of predators affect plant coexistence in two different communities. First, I study natural enemies in tropical forests, using b

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