Dissertations / Theses on the topic 'G. roseum'
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Marinho, Susana Regina Monteiro. "Função dos alcalóides indólicos monoterpenóides de Catharanthus roseus (L.) G. Don." Master's thesis, Universidade do Porto. Reitoria, 2001. http://hdl.handle.net/10216/9949.
Full textConan-Cibotti, Michelle. "Dosages immunoenzymatiques des alcaloi͏̈des bis indoliques de "Catharanthus roseus" G. Don." Paris 11, 1990. http://www.theses.fr/1990PA114832.
Full textMarinho, Susana Regina Monteiro. "Função dos alcalóides indólicos monoterpenóides de Catharanthus roseus (L.) G. Don." Dissertação, Universidade do Porto. Reitoria, 2001. http://hdl.handle.net/10216/9949.
Full textBrun, Gilles. "Étude des constituants chimiques de Catharanthus roseus (L. ) G. Don (Apocynaceae), autres que les alcaloïdes." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE18011.
Full textCazelles, Marie Thérèse. "Biotransformations de monoterpènes par une suspension cellulaire de "Catharanthus roseus" G don (Apocynacées)." Paris 11, 1994. http://www.theses.fr/1994PA114819.
Full textSibéril, Yann. "Facteurs de transcription de type « g-box binding factor » et régulation de la biosynthèse des alcaloïdes de catharanthus roseus." Tours, 2001. http://www.theses.fr/2001TOUR4006.
Full textLamouroux, Brigitte. "Approche d'une sélection et de la micropropagation de génotypes de Catharanthus roseus (L. ) G. Don à teneurs élevées en Catharanthine et vindoline." Toulouse, INPT, 1991. http://www.theses.fr/1991INPT018A.
Full textSchlaifer, Daniel. "Etude des mécanismes de résistance aux alcaloi͏̈des de Catharanthus roseus (G Don) pervenche de Madagascar." Toulouse 3, 1994. http://www.theses.fr/1994TOU30010.
Full textENCISO-RODRIGUEZ, ROBERTO. "Sites et formes d'accumulation des alcaloides indoliques produits par une suspension cellulaire de catharanthus roseus g. Don." Paris 6, 1989. http://www.theses.fr/1989PA066594.
Full textRAVEL, DOMINIQUE. "Isolement de certains alcaloides indoliques d'une souche de catharanthus roseus g. Don cultivee in vitro et etude des variations de leur accumulation dans plusieurs conditions d'anergie." Paris 11, 1994. http://www.theses.fr/1994PA114839.
Full textLaflamme, Pierre. "The cloning and characterization of two acetyl coenzyme A, O-acetyltransferase genes from Catharanthus roseus (L.) G. Don." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ60826.pdf.
Full textBELKOURA, MOUHSSINE. "Systeme redox et extrusion de protons au niveau du plasmalemme des cellules de catharanthus roseus (l. ) g. Don." Toulouse 3, 1986. http://www.theses.fr/1986TOU30072.
Full textBelkoura, Mouhssine. "Système redox et extrusion de protons au niveau du plasmalemme des cellules de Catharanthus roseus (L.) G. Don." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375958563.
Full textPapon, Nicolas. "Implication de systèmes histidine-aspartate kinase dans la transduction des signaux cytokinine et éthylène, inducteurs du métabolisme alcaloi͏̈dique chez Catharanthus roseus (L. ) G. Don." Tours, 2003. http://www.theses.fr/2003TOUR3801.
Full textDecendit, Alain. "Stimulation par les cytokinines de la production d'alcaloïdes indoliques dans des suspensions cellulaires de Catharanthus roseus (L. ) G. Don : modalités et sites d'action." Tours, 1992. http://www.theses.fr/1992TOUR3801.
Full textDicaire, Francine. "Symbolisme et senefiance dans le Roman de la Rose de G. de Lorris." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/MQ43852.pdf.
Full textDantas, Barros Ana Maria. "Biotransformation de substrats exogènes d'origine synthétique par des cultures cellulaires végétales de Catharanthus roseus G. Don, Vinca minor L. Et Thevetia neriifolia Juss." Paris 11, 1991. http://www.theses.fr/1991PA114836.
Full textZunino, Fabien. "Fluoration en milieu superacide : application à la synthèse de nouveaux analogues fluorés d'alcaloi͏̈des de la pervenche de Madagascar (Catharanthus roseus (L.) G. Don)." Poitiers, 1995. http://www.theses.fr/1995POIT2319.
Full textMéheust-Lafitte, Cécile. "Réactivité en milieu superacide d'alcaloi͏̈des de la pervenche de Madagascar [Catharanthus roseus (L. ) G. Don]; application à la synthèse d'analogues réduits, fluorés ou réarrangés." Poitiers, 1998. http://www.theses.fr/1998POIT2310.
Full textHoudusse, Diane. "Etude de l'effet des stress oxydants et des régulateurs de croissance sur la production d'alcaloides indoliques dans des suspensions cellulaires de pervenche tropicale (catharanthus roseus [L] G. Don)." Tours, 2005. http://www.theses.fr/2005TOUR3804.
Full textWe investigated the mechanisms involved in the regulation of monoterpene indole alkaloid (MIA) production by plant growth regulators in suspension cells (line C20D) of the Madagascar periwinkle (Catharanthus roseus). In these cells, MIA production was induced by the suppression of 2,4-D from the culture medium and enhanced by cytokinin treatment. The importance of the cell redox state was pointed out by studying: (i) the major enzymatic activities of the defence antioxidant systems in cells grown under various hormonal conditions; (ii) the effects of oxidants and antioxidants on MIA production. A search for putative molecular markers of MIA production led to the characterisation of two cDNAs encoding geranyl diphosphate synthase and a CrPS protein belonging to [a]β hydroxylase superfamily, respectively. Studying the expression pattern (Northern blots) of CrPS gene in suspension cells, and the localisation of CrPS mRNA (in situ hybridisation) in developing leaves highly suggested a role of CrPS in the signal transduction pathway leading to MIA production
Dziggel, Clarissa [Verfasser], and Michael [Akademischer Betreuer] Wink. "Klonierung und Co-Expression der Tryptophan-Decarboxylase, Strictosidinsynthase und Strictosidinglucosidase, dreier Schlüsselgene der Monoterpenindolalkaloid-Biosynthese aus Catharanthus roseus (L.) G. DON / Clarissa Dziggel ; Betreuer: Michael Wink." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177148870/34.
Full textLutoschkin, Eugen [Verfasser], and Martin G. [Akademischer Betreuer] Rose. "Pressure-gain combustion for gas turbines based on shock-flame interaction / Eugen Lutoschkin. Betreuer: Martin G. Rose." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/105202100X/34.
Full textBarakat, Makhzoum Abdullah. "Mise en place d'un système de transfert de gènes et de regénération de plantes in vitro pour l'étude de la régulation du métabolisme des alcaloïdes chez Catharanthus roseus (L. ) G. Don : application au promoteur de la déacétylvindoline 4-0-acétyltransférase." Tours, 2007. http://www.theses.fr/2007TOUR3802.
Full textThis thesis focuses on functional analysis of deacetylvindoline 4-O-acetyltransferase (dat) gene promoter in Catharanthus roseus (Madagascar periwinkle). DAT catalyze the last step in vindoline biosynthesis. This monoterpenoid indole alkaloid is a precursor of the bisindole anticancer drugs vinblastine and vincristine. The expression of DAT gene is known to be restricted to specific cell types called idioblast and laticifer in young leaves and flowers. In order to decipher the element controlling dat gene transcription, we attempted to establish a gene transfer system in differentiated tissues where this gene is expressed. Shoot regeneration system was established using hypocotyls, cotyledons and meristems. Transient expression of glucuronidase reporter gene was demonstrated in these explants following T-DNA gene transfer by disarmed Agrobacterium tumefaciens bearing pCAMBIA1305. 1. However, selection of hygromycin-resistant stable transformant was not successful from cotyledons and hypocotyls explants while chimerical tissues were obtained from meristems. Furthermore, our attempt to regenerate organized tissue using virulent Agrobacterium rhizogenes allowed us to obtain chlorophyllian organized tissues. To analyze the cell-type specific mechanism of regulation, 812bp and 2,3 kb of dat 5’ upstream sequences were fused to the GusPlus reporter gene, with or without dat coding sequences. These constructions were tested by transient expression in organs of C. Roseus following agro¬infiltration and by stable transformation in tobacco. The reporter gene in these constructs demonstrated organ-specificity but not cell specific expression except for the dat promoter-coding region fusion that shows a cell specific expression in the heterologous system. Ectopic expression was localized in stomata guard cells. In silico analysis revealed many putative cis-acting regulatory elements in upstream and downstream dat regions. Binding sites for DOF transcription factors were detected in dat coding region. These factors have been reported to participate in the regulation of gene expression in many processes such as plant defence mechanism and stomata guard cell specific gene regulation. These results illustrate the role of transgene integration in the genome and the role of regulatory elements in the coding region to establish a cellular-specific gene regulation
Rose, Alexander [Verfasser], Klaus-Peter [Akademischer Betreuer] Hofmann, Peter [Akademischer Betreuer] Hildebrand, and Peter [Akademischer Betreuer] Hegemann. "The dynamic coupling interface of G-protein coupled receptors : a molecular dynamics simulations study / Alexander Rose. Gutachter: Klaus-Peter Hofmann ; Peter Hildebrand ; Peter Hegemann." Berlin : Lebenswissenschaftliche Fakultät, 2015. http://d-nb.info/1071885960/34.
Full textVIZZUSO, CELESTE. "Interazioni antagonistiche in vitro fra Phomopsis quercina e funghi endofitici di specie quercine." Doctoral thesis, 2007. http://hdl.handle.net/2158/572497.
Full textPomahačová, Barbora. "Heterologní exprese ABC transportéru v Catharanthus Roseus (L.) G. Don." Doctoral thesis, 2009. http://www.nusl.cz/ntk/nusl-278472.
Full textLima, Francisco Anastácio de Abreu e. "Cloning and characterization of CroMATE1, a novel MATE-type transporter from the medicinal plant Catharanthus roseus (L.) G. Don." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/70215.
Full textLima, Francisco Anastácio de Abreu e. "Cloning and characterization of CroMATE1, a novel MATE-type transporter from the medicinal plant Catharanthus roseus (L.) G. Don." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/70215.
Full textSilva, Ana Luísa Ferreira Guimarães. "Characterization of transcription factors implicated in the regulation of the anticancer indole alkaloid pathway in Catharanthus roseus (L.) G. Don." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/70060.
Full textSilva, Ana Luísa Ferreira Guimarães. "Characterization of transcription factors implicated in the regulation of the anticancer indole alkaloid pathway in Catharanthus roseus (L.) G. Don." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/70060.
Full textPham, Hong Ngoc Thuy. "Investigation of the biological and anticancer properties of bioactive compounds derived from Helicteres hirsuta Lour. and Catharanthus roseus (L.) G. Don." Thesis, 2019. http://hdl.handle.net/1959.13/1412999.
Full textSelected plants, including Helicteres hirsuta Lour. (H. hirsuta) and Catharanthus roseus (L.) G. Don (C. roseus) have been used traditionally as medicinal plants for the treatment of various ailments in many countries. The root of H. hirsuta has been utilized for treating malaria and diabetes in Thailand, whereas Vietnamese people have used H. hirsuta leaf and root for pain relief, dysentery, measles, flu, antidote and poliakiuria. The hot water extract of the dried C. roseus plant has been taken orally for the treatment of cancer, heart disease and leishmaniasis in Peru. Also, the hot water extract of the dried C. roseus leaf has been used for the treatment of diabetes in Jamaica, Kenya and West India. Moreover, previous studies have found that these plants contain bioactive compounds with anticancer properties against various cancer cell lines. Some isolated lignans from H. hirsuta stem, including (±)-pinoresinol, (−)-boehmenan and (−)- boehmenan H, possessed cytotoxic activity against human lung carcinoma, hormone-dependent human prostate carcinoma and human breast carcinoma. Vinblastine and vincristine derived from C. roseus have been used in combination with other cancer chemotherapeutic drugs for treating advanced testicular cancer, breast and lung cancers. Consequently, H. hirsuta and C. roseus are important materials for the exploration of new phytochemicals for potential utilisation in the pharmaceutical industry. Cancer, a major cause of morbidity and mortality, affects populations in all countries. Cancer is also costly, being a significant financial burden on the people of low- and middle income countries. Of note, pancreatic cancer is the fourth leading cause of cancer death worldwide and has a low 5-year survival rate. Up to now, there have been limited studies conducted to investigate the anti-pancreatic cancer activity and potential of H. hirsuta and C. roseus. Therefore, these two medicinal plants were selected as the starting materials for extraction and isolation of known and un-identified bioactive compounds for in vitro assessment against a panel of cancer cell lines, in particular pancreatic cancer cells. Additionally, the derived bioactive compounds from these plants were investigated for their antioxidant and antimicrobial properties. The overall aim of this study was to extract and isolate bioactive compounds with antioxidant, antimicrobial, anticancer (particularly pancreatic cancer) activities from H. hirsuta and C. roseus. Specific objectives of the project included (1) determining the effect of different extraction solvents and drying methods on bioactive compound yield and antioxidant capacity of plant extracts; (2) optimisation of extraction conditions to maximise bioactive compound yield from dried plant materials; and (3) elucidation of the phytochemical profiles and assessment of the antioxidant, antimicrobial, and anticancer (particularly pancreatic cancer) properties in vitro of the derived extracts and fractions from H. hirsuta and C. roseus. This study revealed that H. hirsuta and C. roseus possessed high levels of bioactive compounds, including phenolics, flavonoids and saponins with strong antioxidant capacity. The yield of bioactive compounds obtained from these plants was significantly affected by the nature of the extraction solvent. Among the range of solvents tested, water was demonstrated to be suitable for phenolic extraction, whereas methanol revealed its dominant advantage in saponin extraction from both H. hirsuta and C. roseus. Various thermal drying conditions also had a remarkable effect on the retention of bioactive compounds and antioxidant property of the plant samples. The extraction process is a crucial step in liberating bioactive compounds from the plant matrix. It is necessary to determine the optimised extraction conditions as this directly impacts extraction efficiency, the stability and yield of the isolated bioactive compounds. Ultrasound-assisted extraction (UAE) was selected in this investigation to reduce extraction time, increase extraction yield and retain bioactive compounds when compared to conventional extraction. Response surface methodology (RSM) was employed to generate the optimal UAE conditions for enhanced total phenolic content, saponins and antioxidant capacity of H. hirsuta and C. roseus. The crude extracts from H. hirsuta and C. roseus contained a number of individual components with significant bioactivity. As such, the crude extracts were firstly separated using the liquid-liquid extraction technique to obtain extracts of increasing polarity, including n-butanol (saponin-enriched) and residual aqueous fractions. The phytochemical profiles of the crude extracts and their derived fractions, including saponin-enriched butanol and aqueous fractions, were elucidated by HPLC analysis. They were then subjected to antioxidant, antimicrobial and cytotoxic screening. The results highlighted that the saponin-enriched butanol fractions from either H. hirsuta leaf and stem or C. roseus stem and root exhibited strong antioxidant and antimicrobial capacity, as well as cytotoxic activity against a panel of cancer cell lines, including A2780 (ovarian), H460 (lung), A431 (skin), MIA PaCa-2 (pancreas), Du145 (prostate), HT29 (colon), MCF-7 (breast), BE2-C (neuroblastoma), SJ-G2, U87 and SMA (glioblastoma) at low doses. Of note, they possessed potent in vitro anti-proliferative activity towards MIAPaCa-2, BxPC-3 and CFPAC-1 pancreatic cancer cells. These findings indicated that n-butanol was effective in extracting antioxidants, antimicrobials and anticancer components from these plants. Thus, the saponin-enriched butanol fraction from H. hirsuta stem, one of the potent saponin-enriched butanol fractions, was subsequently fractionated using semi-preparative reversed-phase (RP) HPLC. The anti-proliferative data showed that the five xxvii sub-fractions derived from the saponin-enriched butanol fraction of H. hirsuta stem inhibited the growth of the pancreatic cancer cells via the induction of apoptosis, as well as promoting S phase cell cycle arrest. The identification of the five active sub-fractions were further determined using nanoflow RP Liquid Chromatography coupled directly to a Q-Exactive Plus Hybrid Quadrupole Orbitrap Mass Spectrometer. The LC/MS analysis revealed that the isolated fractions from H. hirsuta stem contained bioactive compounds, such as rosmarinic acid, caffeic acid, sagerinic acid, usnic acid, cucurbitacin S, 2-O-β-D-glucopyranosyl-cucurbitacin B (Arvenin I), 4-oxo-beta-isodamascol and absinthin, in which most have been previously demonstrated to exhibit diverse biological activities. In conclusion, these findings further confirm that H. hirsuta and C. roseus contain promising bioactive compounds with diverse biological activities, such as antioxidant, antimicrobial and anticancer (eg. pancreatic cancer) activities. It is expected that the outcomes from this research will provide a strong basis for further assessment in vivo and pre-clinical models, and perhaps then further investigation in clinical trials.
Gonzalez, Maria Fernanda Niño. "Cloning and characterization of transporter genes potentially involved in the transmembrane transport of the alkaloids from the medicinal plant Catharanthus roseus (L.) G. Don." Master's thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/68676.
Full textGonzalez, Maria Fernanda Niño. "Cloning and characterization of transporter genes potentially involved in the transmembrane transport of the alkaloids from the medicinal plant Catharanthus roseus (L.) G. Don." Dissertação, 2013. https://repositorio-aberto.up.pt/handle/10216/68676.
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