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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.
1

Regulators of Ubiquitin Dependent Protein Degradation in the Filamentous Fungus <i>Aspergillus nidulans</i>: Insights into CsnB, DenA and CandA Function / Regulatoren der Ubiquitin abhängigen Protein Degradation in dem filamentösen Pilz <i>Aspergillus nidulans</i>: Einblicke in die Funktion von CsnB, DenA und CandA

Schwier, Elke Ute 24 January 2008 (has links)
No description available.
2

Phosphorylation dependent stability control of the deneddylase DenA and its impact on Aspergillus nidulans development

Schinke, Josua Sebastian 28 January 2016 (has links)
Zusammenfassung Ein fehlerhafter Proteinabbau führt in höheren Eukaryoten zu diversen Krankheiten wie z.B. neurodegenerativen Störungen und Krebs. Es ist daher bedeutend die Regulationsmechanismen des Proteinabbaus zu verstehen. Intrazelluläre Proteine werden spezifisch durch das Ubiquitin-Proteasome System abgebaut. Cullin-RING Ligasen, welche durch das ubiquitin-ähnliche Protein Nedd8 aktiviert werden, binden und markieren das Zielprotein mit Ubiquitin. Diese ubiquitinierten Proteine werden durch das 26S Proteasome abgebaut. Die zwei Deneddylasen DenA und COP9 Signalosome (CSN) entfernen Nedd8 von unterschiedlichen Substraten. Diese Arbeit zeigt im Modellorganismus Aspergillus nidulans, dass DenA aus einer Kernfraktion sowie einer dynamischen zytoplasmatischen Subpopulation besteht. Zudem wird (A) das Zusammenspiel zwischen DenA und CSN im Kern untersucht und (B) die bisher unbekannte Phosphatase DipA, welche an der Regulation des zytoplasmatischen DenA und an der Zelldifferenzierung beteiligt ist, charakterisiert. (A) Eine erhöhte DenA Konzentration kann teilweise das Fehlen eines aktiven CSN kompensieren, indem es der Akkumulation an neddylierten Proteinen und damit CSN assoziierten Entwicklungsstörungen entgegenwirkt. Beide pilzlichen Deneddylasen haben somit unterschiedliche aber auch überlappende Funktionen. Zusätzlich zeigt sich, dass die DenA Kernfraktion, welche mit dem CSN interagiert, in der pilzlichen Entwicklung durch fünf benachbarte CSN Untereinheiten destabilisiert wird. Da diese Untereinheiten eine funktionelle Oberfläche bilden ist anzunehmen, dass die Interaktion von DenA mit dieser Oberfläche wichtig für die Stabilitätskontrolle der DenA Kernsubpopulation ist. (B) Zytoplasmatisches DenA wird zusammen mit DipA transportiert und akkumuliert an den Septen. Fehlt DipA erhöht sich die DenA Stabilität. Somit spielt DipA eine wichtige Rolle in der zytoplasmatischen DenA Stabilitätskontrolle. Zusätzlich führt das Fehlen von DipA zu einer erhöhten Septenbildung und Defekten in der lichtabhängigen Zellentwicklung des Pilzes. DipA wird somit, neben der DenA Stabilitätskontrolle, für die Zelldifferenzierung benötigt. Die Stabilität der zwei DenA Subpopulationen wird zusätzlich durch Phosphorylierung reguliert. Während vegetativen Bedingungen wird DenA durch die Phosphorylierung von S243 und S245 stabilisiert, was für die Initiierung der nachfolgenden asexuellen Entwicklung wichtig ist. Anschließend wird DenA durch eine Änderung des Phosphorylierungsmusters destabilisiert und abgebaut. Zusammenfassend zeigt diese Studie Einblicke in komplexe Mechanismen des DenA Proteinabbaus, welche womöglich auch in höheren Eukaryoten relevant sind.
3

Deneddylation and fungal development - Regulation of Nedd8 protein modification by DenA and the COP9 signalosome / Deneddylierung und pilzliche Entwicklung - Regulierung von Nedd8 Proteinmodifizierung durch DenA und das COP9 Signalosom

Christmann, Martin 09 December 2011 (has links)
No description available.
4

Efeito do MEI (multiple exemplar instruction) na integração entre repertórios de ouvinte e falante em crianças com desordem do espectro da neuropatia auditiva e implante coclear / Effect of multiple exemplar instruction (MEI) on integration between listener and speaker repertoires in children with auditory neuropathy spectrum disorder and cochlear implant

Merlin, Adriana Maura Barboza [UNESP] 28 March 2017 (has links)
Submitted by ADRIANA MAURA BARBOZA MERLIN null (drimerlin@hotmail.com) on 2017-05-16T02:05:02Z No. of bitstreams: 1 Efeito do MEI (Multiple Exemplar Instruction) na integração entre repertórios de ouvinte e falante em crianças com Desordem do Espectro da Neuropatia Auditiva e implante coclear.pdf: 1899105 bytes, checksum: d8d54b35191a2f700898f07ef9b574b9 (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-05-16T14:55:26Z (GMT) No. of bitstreams: 1 merlin_amb_me_bauru.pdf: 1899105 bytes, checksum: d8d54b35191a2f700898f07ef9b574b9 (MD5) / Made available in DSpace on 2017-05-16T14:55:26Z (GMT). No. of bitstreams: 1 merlin_amb_me_bauru.pdf: 1899105 bytes, checksum: d8d54b35191a2f700898f07ef9b574b9 (MD5) Previous issue date: 2017-03-28 / Estudos da parceria entre a Fonoaudiologia e Análise do Comportamento têm investigado sob quais condições de ensino implantados cocleares pré-linguais aprendem habilidades auditivas e as relações que estabelecem com a produção oral. Uma rota que permite a extensão do controle entre repertórios verbais é o Ensino por Múltiplos Exemplares (do inglês Multiple Exemplar Instruction, MEI), que tem sido pouco explorada em estudos com usuários de implante coclear. Este estudo objetivou investigar o efeito do ensino por MEI sobre a integração entre repertórios de ouvinte e falante em crianças com Desordem do Espectro da Neuropatia Auditiva (DENA) e usuárias de implante coclear (IC). Participaram três crianças com 6 anos de idade, uma do sexo feminino e duas do sexo masculino, com o diagnóstico de DENA e um quadro de perda auditiva severa-profunda, bilateral e pré-lingual. Todos os participantes usavam implante coclear uni ou bilateral, frequentavam o ensino regular e recebiam atendimento multidisciplinar no follow-up do serviço de implante coclear. Os participantes apresentavam maturidade intelectual típica e reconhecimento auditivo inferior à idade cronológica, aferidos pela Escala Colúmbia de Maturidade Intelectual e o Peabody Picture Vocabulary Test (PPVT-4R). Foram adotados estímulos auditivos e figuras que corresponderam às palavras (substantivos) e sentenças de dois termos (substantivos+adjetivos), que foram convencionais (para GABI e SOZA) e não convencionais (para DOZA). O estudo empregou um delineamento de sondas múltiplas e foi composto por sondas e ensino. As sondas foram intercaladas com o ensino e avaliaram as relações de discriminação condicional auditivo-visual, de tato e de ecoico para os estímulos de todas as unidades. O ensino foi organizado em duas unidades e cada unidade tinha dois passos; no passo 1, eram ensinadas relações verbais envolvendo apenas substantivos; no passo 2, substantivos+adjetivos. Os blocos de ensino foram estruturados por MEI e apresentavam de maneira rotativa as tarefas de ecoico, de ouvir baseado em seleção (discriminação condicional auditiva-visual) e de tato. Na primeira sonda (pré-teste), os participantes apresentaram desempenhos de ouvinte com variabilidade (100% de acertos para GABI, 60% para SOZA e nulo para DOZA) e os desempenhos de falante foram discrepantes, com porcentagem de acertos nos desempenhos de falante superior ou inferior ao de ouvinte. Os números de sessões variaram entre os participantes, até atingirem a maior porcentagem de acertos nas tarefas de ouvinte e de falante. Ainda que o repertório de ouvinte fosse mais preciso e aprendido primeiro, todos aumentaram a porcentagem de acertos nos desempenhos de falante que ficaram próximos aos de ouvinte após o ensino. Nas sondas que sucederam o ensino com substantivos, GABI e SOZA mantiveram os desempenhos em ouvir e falar e demonstraram a extensão de controle dos estímulos do Passo 1 (substantivo) para o Passo 2 (substantivo+adjetivo), mesmo que ainda não tivesse sido diretamente ensinado. Discute-se o potencial do uso clínico do MEI no estabelecimento, integração e extensão dos repertórios de ouvinte e falante em crianças com DENA e IC. / Studies of the partnership between Speech-Language Pathology and Behavioral Analysis have investigated under which teaching conditions that pre-lingual implanted cochlear learn listening skills and the relations that establish with oral production. A route that can be to promote the extension of control between verbal repertoires is designated Multiple Exemplary Instruction (MEI), which has been little explored in studies with cochlear implants users. This study aimed to investigate the effect of MEI’ teaching on the integration between listening and speaking repertoires in children with Auditory Neuropathy Spectrum Disorder (DENA) and cochlear implants users (CI). Participants were three 6-year-old children, one female and two males, with the diagnosis of DENA and a severe-profund, bilateral and pre-lingual hearing loss. All participants used a uni or bilateral cochlear implant, attended regular education and received multidisciplinary care in the follow-up of the cochlear implant service. Participants had typical intellectual maturity and auditory recognition lower the chronological age, measured by Columbia and PPVT-4R tests. Auditory stimuli and figures that corresponded to words (nouns) and sentences of two terms (nouns + adjectives) were used, which were conventional (GABI and SOZA) and nonconventional (DOZA). The study employed a multiple probe design and was composed of probes and teaching. The probes were intercalated with the teaching and evaluated the conditional auditory-visual relations, tact and echoic for the stimuli of all units. Teaching was organized into two units and each unit had two steps; in step 1, verbal relations involving only nouns were taught; in step 2, nouns + adjectives. The teaching blocks were structured by MEI and presented in a rotative way the tasks of echoic, listening based on selection (auditory-visual conditional discrimination) and tact. In the first probe (pre-test), the participants presented listener performances with variability (100% of GABI hits, 60% for SOZA and nil for DOZA) and the speaker performances were discrepant, with correct response percentage higher or lower than the listener. Participants required, an average, of eight sessions in the teaching until they achieved the highest percentage in the listening and speaking tasks. Although the listener's repertoire was more accurate and learned first, they all increased the correct response percentage in the performances of the speakers who were close to those of the listener after teaching. In the probes that succeeded teaching with nouns, GABI and SOZA maintained the listening and speaking performances and demonstrated the control extension of the stimuli from Step 1(noun) to Step 2 (noun + adjective), even though it had not yet been taught directly. The potential of the clinical use of MEI in the establishment, integration and extension of the listener and speaker repertoires in children with DENA and CI is discussed.

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