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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

NANOCÁPSULAS CONTENDO ÁCIDO ALL-TRANS-RETINOICO: EFEITO ANTITUMORAL VIA DIFERENCIAÇÃO CELULAR E ATIVAÇÃO APOPTÓTICA INTRÍNSECA EM CÉLULAS DE LEUCEMIA PROMIELOCÍTICA AGUDA

Homrich, Shayenne Scheffer 28 March 2017 (has links)
Submitted by MARCIA ROVADOSCHI (marciar@unifra.br) on 2018-08-17T19:27:03Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_ShayenneSchefferHomrich.pdf: 1706469 bytes, checksum: 48ab5f162c893018778d1ac573ca031d (MD5) / Made available in DSpace on 2018-08-17T19:27:03Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_ShayenneSchefferHomrich.pdf: 1706469 bytes, checksum: 48ab5f162c893018778d1ac573ca031d (MD5) Previous issue date: 2017-03-28 / The Acute Promyelocytic Leukemia (APL), firstly described in 1957, is the most malignant type of acute leukemia. Currently, the knowledge of its pathophysiological mechanism at molecular levels became possible the development of efficient therapies making APL the most curable leukemia type. In this sense, APL is also used as a model on cancer advances, being the molecular treatment performed with all trans-retinoic acid (ATRA) that presents high efficiency at its control. However, several patients develop differentiation syndrome, as a side effect of this drug. In these terms, compared to another drugs, the cytotoxic antineoplastic agents present particular problems, as poor specificity, high toxicity and resistance susceptibility. An alternative strategy to decrease the ATRA cytotoxicity is the incorporation of this drug in polymer nanocapsules with oily core. In this work nanocapsules with lipid core containing ATRA (NA) were evaluated as their potential to inhibit cellular grow, to induce apoptosis, to interfere the cell cycle, and at APL cellular differentiation using NB4 cell line. Results showed that NA was able to overcome the cellular resistance to AL treatment, decreasing cell viability, inducing apoptosis, through BAX/BCL-2 gene expression, cell cycle arresting at G1 phase and cellular differentiation under 1.5 and 2.0 μM. Additionally, theses systems can contribute to increase the efficacy and reduce the toxicity due to the potential accumulation of nanoparticles at the tumor region due to increased vascular permeability of tumor vases. The ATRA incorporation in lipid nanocarriers is a interesting alternative to make possible its intravenous administration. Moreover, these systems present potential to drug accumulation at tumor tissue through a passive targeting called effect of permeability and increased retention. / A Leucemia Promielocítica Aguda (LPA), primeiramente descrita em 1957 é a forma mais maligna de leucemia aguda. Atualmente, o conhecimento dos seus mecanismos fisiopatológicos em nível molecular possibilitou o desenvolvimento de terapias eficazes fazendo com que a LPA seja a forma mais curável de leucemia. Por este motivo a LPA é também utilizada como modelo para os avanços no tratamento do câncer, sendo o tratamento molecular com ácido all-trans-retinoico (ATRA) o que apresenta alta eficiência no seu controle. Entretanto, inúmeros pacientes adquirem a Síndrome de Diferenciação, como efeito adverso a este medicamento. Diante disto, em comparação com outros fármacos, os antineoplásicos citotóxicos apresentam problemas únicos, como pobre especificidade, elevada toxicidade e susceptibilidade para induzir resistência. Uma estratégia para diminuir a citotoxicidade do ATRA é a incorporação do mesmo em nanocápsulas poliméricas com núcleo oleoso. Neste trabalho nanocápsulas de núcleo lipídico contendo ATRA (NA) foram avaliadas quanto ao seu potencial de inibir o crescimento, induzir a apoptose e interferir com o ciclo celular e na diferenciação de células de LPA, linhagem NB4. Os resultados demonstraram que a NA foi capaz de superar a resistência celular ao tratamento com AL, reduzindo a viabilidade celular, induzindo apoptose, pela expressão dos genes BAX/BCL-2, parada do ciclo celular em G1 e diferenciação celular nas concentrações de 1,5 e 2,0 μM. Adicionalmente, estes sistemas podem contribuir para o aumento da eficácia e redução da toxicidade devido ao potencial para acúmulo das nanopartículas na região tumoral graças à permeabilidade vascular aumentada dos vasos tumorais. A incorporação de ATRA em nanocarreadores lipídicos constitui uma alternativa interessante para viabilizar sua administração intravenosa. Além disso, estes sistemas apresentam potencial para acúmulo do fármaco na região tumoral, por meio de um direcionamento passivo chamado de efeito de permeabilidade e retenção aumentada.
12

Virtueller Zusammenschluss digitaler Papyrussammlungen : das „Papyrusportal"

Gerhardt, Marius 06 April 2016 (has links) (PDF)
No description available.
13

Das Buch in Antike, Mittelalter und Neuzeit

11 May 2016 (has links)
Die Universitätsbibliothek Leipzig gehört zu den großen Altbestandsbibliotheken in Deutschland. Sie besitzt eine Vielzahl an bedeutenden Sonderbeständen, die den Rang eines nationalen Kulturerbes einnehmen. <i>Das Buch in Antike, Mittelalter und Neuzeit</i> gibt einen Einblick in die Arbeit mit diesen Sonderbeständen. Von Beiträgen zu Dokumenten aus antiker Zeit, Papyri und Ostraka über Aufsätze zu mittelalterlichen Handschriften bis hin zur neuzeitlichen Handschriftenüberlieferung (Buchhandschriften, aber auch Nachlässe, Autographensammlungen und Stammbücher) werden Erschließungsfragen diskutiert, für die in den letzten Jahren durch die Einbindung EDV-technischer Verfahren neue Lösungsvorschläge erarbeitet wurden. Aufsätze über druckgraphische Sammlungen, Gelehrtenbibliotheken und Schulschriftensammlungen tragen dem zentralen Bestandteil einer jeden Bibliothek, dem gedruckten Buch, und der Geschichte des europäischen Buchdrucks Rechnung. Zudem wird der Erschließung von Sammlungen nichteuropäischer Handschriften, von Texten in den Sprachen Arabisch, Persisch und Türkisch sowie in indischen Sprachen nachgegangen, die die Leipziger Bibliothek vor besondere Herausforderungen stellen. Die Konzentration auf die Dokumentation des Bucherbes hat es nicht verhindert, dass an der Universitätsbibliothek auch andere Medientypen gesammelt wurden. Dazu gehört an erster Stelle die größte universitäre Sammlung in Deutschland von 85.000 Münzen und Medaillen, die nun erstmals vorgestellt wird.
14

Bibliotheken zwischen Kultureller Memoria, Wissenschaft und Musealität

Fuchs, Thomas 05 April 2016 (has links) (PDF)
No description available.
15

Die neuzeitlichen Handschriften der Universitätsbibliothek

Fuchs, Thomas 23 September 2016 (has links) (PDF)
No description available.
16

Formale Widerspenstigkeit : Nachlässe und Autographensammlungen

Fuchs, Thomas 23 September 2016 (has links) (PDF)
No description available.
17

Gebrauchsgraphik : Porträtstich-Sammlung und Exlibris-Sammlung

Fuchs, Thomas 23 September 2016 (has links) (PDF)
No description available.
18

Bibliotheken in der Bibliothek : Schulschriftensammlungen in der Universitätsbibliothek

Fuchs, Thomas 23 September 2016 (has links) (PDF)
No description available.
19

Zur Methode der Kurzerfassung mittelalterlicher Handschriften : Ergebnisse und Funde in einem Segment theologischer Handschriften der Universitätsbibliothek Leipzig

Märker, Almuth 23 September 2016 (has links) (PDF)
No description available.
20

Die Papyrus- und Ostrakasammlung der Universitätsbibliothek Leipzig

Scholl, Reinhold 06 April 2016 (has links) (PDF)
No description available.

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