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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

Estudo sobre a expressão dos genes de alfa amilase de Bacillus stearothermophilus e de anopheles merus em células de bactéria, levedura e inseto / Study on the expression of Bacillus stearothermophilus alpha amylase and anopheles merus genes in bacterial, yeast and insect cells

Effio, Pedro Jorge Chimoy 05 April 2001 (has links)
O gene A1 da alfa amilase foi isolado de uma biblioteca genômica em lambda EMBL3, feita com DNA do díptero primitivo Anopheles merus (Díptera, Nematocera, Culicoidea). Ele foi parcialmente seqüenciado, caracterizado pelo padrão da clivagem das enzimas restritivas e clonado no plasmídeo pIBI24 por Pernasetti (1991 ). No presente trabalho relata-se sua expressão em: bactéria (Escherichia coli AD494), células de inseto ( Spodoptera frugiperda) e em levedura (Pichia pastoris), tendo-se observado que somente nas células de Spodoptera frugiperda a enzima é expressa com atividade. A expressão extracelular do gene A1 foi ensaiada em E.coli AD494 usando o vetor pRSETc. Para este fim a seqüência do gene contendo seu próprio peptídeo sinal, foi inserida em fase de leitura (\"frame\") nesse vetor. A expressão sem peptídeo sinal foi executada usando o vetor pAE2, uma construção derivada- do pRSETc. Numa outra construção, o gene A1 foi inserido em fase de leitura após a seqüência do promotor e do peptídeo sinal do gene A2 (alfa amilase de Bacillus stearothermophilus) utilizando-se o vetor pIBI24-Bst. As células de E.coli AD494 transformadas com estes construções expressaram a enzima sem atividade. A amilase A1 não foi secretada nem com seu peptídeo sinal nem com o da amilase A2. A expressão do gene A1 em levedura (Pichia pastoris) foi feita usando o vetor pPic9, que permite a expressão tanto intracelular quanto a secreção da proteína. O gene foi amplificado por PCR usando \"primers forward\" com o intuito de obter o gene com ou sem peptídeo sinal. O gene contendo o peptídeo sinal foi construído com diferentes seqüências tipo Kozak precedendo o códon ATG. Para a expressão extracelular usou-se o peptídeo sinal do fator alfa do pPic9. Os resultados mostraram que a enzima é expressa mas que permanece dentro da célula sem atividade. As mesmas construções do gene A1 feitas para Pichia foram inseridas em Baculovírus para transfectar células de Spodoptera frugiperda. Neste sistema a amilase foi expressa com atividade principalmente no sobrenadante das culturas transformadas com construções usando o gene contendo o seu próprio peptídeo sinal assim com o peptídeo sinal da amilase de Zabrotes subfasciatus. O gene da alfa amilase de Bacillus stearothermophilus foi expresso no sistema Baculovírus-Spodoptera e na levedura Pichia, usando o gene contendo o peptídeo sinal da amilase de Z. subfasciatu. A proteína foi secretada e tinha atividade em ambos os sistemas. / The alpha amylase A1 gene was isolated trom a genomic library of lambda EMBL3 made with DNA from the primitve Díptera Anopheles merus (Díptera, Nematocera, Cuclicoidea). This gene was partialy sequenced, characterized by standard restriction enzyme cleavage, and cloned into the pIBI24 plasmid by Pernasetti (1991). Here we present the expression of this gene in: bacteria (Escherichia coli AD494), insect cell (Spodoptera frugiperda) and yeast (Pichia pastoris). It was shown that only in Spodoptera frugiperda cells the protein display enzymatic activity. The presence of the A1 product in the extracelullar culture media was tested in Escherichia coli AD494 using the vector pRSETc. To this end, the gene sequence containing its own signal peptide was inserted in frame into the vector. Expression without a signal peptide was conducted using the pAE2 vector, a construct derived from pRSETc. In another construct, the A1 gene was inserted in frame after the promoter sequence and the signal peptide of the A2 gene (alpha amylase Bacillus stearothermophilus) using the pIBI24-Bst vector. Although the E.coli AD494 cells transformed with these constructs expressed the enzyme, no enzyme activity was detected. A1 was not secreted, either with its own signal peptide or with that of amylase A2. Expression of the A1 gene in yeast (Pichia pastoris) was conducted using the pPic9 vector, wich allows intracellular expression or secretion of this protein. The gene was amplified by PCR with forward primers, so as to amplyfy the gene sequence with or without the signal peptide. The gene containing the signal peptide was constructed with different Kozak sequences preceeding the ATG codon. For extracellular expression, the signal peptide of the pPic9 alpha factor was used. The results showed that the enzyme is expressed , but remained within the cell and do not display activity. The same constructs of the A1 gene made for P. pastoris were inserted in Baculovirus to infect Spodopera frugiperda cells. In this system, the amylase was successfully expressed and display enzymatic activity, mainly in the extracellular supernatant, using constructs of the gene with own signal peptide or with the signal peptide for amylase of Zabrotes subfasciatus. The gene A2 was expressed in the Baculovirus/Spodoptera system and the yeast P. pastoris using constructs containing the signal peptide of alpha amylase of Z. subfasciatus, the protein was secreted with activity.
2

Estudo sobre a expressão dos genes de alfa amilase de Bacillus stearothermophilus e de anopheles merus em células de bactéria, levedura e inseto / Study on the expression of Bacillus stearothermophilus alpha amylase and anopheles merus genes in bacterial, yeast and insect cells

Pedro Jorge Chimoy Effio 05 April 2001 (has links)
O gene A1 da alfa amilase foi isolado de uma biblioteca genômica em lambda EMBL3, feita com DNA do díptero primitivo Anopheles merus (Díptera, Nematocera, Culicoidea). Ele foi parcialmente seqüenciado, caracterizado pelo padrão da clivagem das enzimas restritivas e clonado no plasmídeo pIBI24 por Pernasetti (1991 ). No presente trabalho relata-se sua expressão em: bactéria (Escherichia coli AD494), células de inseto ( Spodoptera frugiperda) e em levedura (Pichia pastoris), tendo-se observado que somente nas células de Spodoptera frugiperda a enzima é expressa com atividade. A expressão extracelular do gene A1 foi ensaiada em E.coli AD494 usando o vetor pRSETc. Para este fim a seqüência do gene contendo seu próprio peptídeo sinal, foi inserida em fase de leitura (\"frame\") nesse vetor. A expressão sem peptídeo sinal foi executada usando o vetor pAE2, uma construção derivada- do pRSETc. Numa outra construção, o gene A1 foi inserido em fase de leitura após a seqüência do promotor e do peptídeo sinal do gene A2 (alfa amilase de Bacillus stearothermophilus) utilizando-se o vetor pIBI24-Bst. As células de E.coli AD494 transformadas com estes construções expressaram a enzima sem atividade. A amilase A1 não foi secretada nem com seu peptídeo sinal nem com o da amilase A2. A expressão do gene A1 em levedura (Pichia pastoris) foi feita usando o vetor pPic9, que permite a expressão tanto intracelular quanto a secreção da proteína. O gene foi amplificado por PCR usando \"primers forward\" com o intuito de obter o gene com ou sem peptídeo sinal. O gene contendo o peptídeo sinal foi construído com diferentes seqüências tipo Kozak precedendo o códon ATG. Para a expressão extracelular usou-se o peptídeo sinal do fator alfa do pPic9. Os resultados mostraram que a enzima é expressa mas que permanece dentro da célula sem atividade. As mesmas construções do gene A1 feitas para Pichia foram inseridas em Baculovírus para transfectar células de Spodoptera frugiperda. Neste sistema a amilase foi expressa com atividade principalmente no sobrenadante das culturas transformadas com construções usando o gene contendo o seu próprio peptídeo sinal assim com o peptídeo sinal da amilase de Zabrotes subfasciatus. O gene da alfa amilase de Bacillus stearothermophilus foi expresso no sistema Baculovírus-Spodoptera e na levedura Pichia, usando o gene contendo o peptídeo sinal da amilase de Z. subfasciatu. A proteína foi secretada e tinha atividade em ambos os sistemas. / The alpha amylase A1 gene was isolated trom a genomic library of lambda EMBL3 made with DNA from the primitve Díptera Anopheles merus (Díptera, Nematocera, Cuclicoidea). This gene was partialy sequenced, characterized by standard restriction enzyme cleavage, and cloned into the pIBI24 plasmid by Pernasetti (1991). Here we present the expression of this gene in: bacteria (Escherichia coli AD494), insect cell (Spodoptera frugiperda) and yeast (Pichia pastoris). It was shown that only in Spodoptera frugiperda cells the protein display enzymatic activity. The presence of the A1 product in the extracelullar culture media was tested in Escherichia coli AD494 using the vector pRSETc. To this end, the gene sequence containing its own signal peptide was inserted in frame into the vector. Expression without a signal peptide was conducted using the pAE2 vector, a construct derived from pRSETc. In another construct, the A1 gene was inserted in frame after the promoter sequence and the signal peptide of the A2 gene (alpha amylase Bacillus stearothermophilus) using the pIBI24-Bst vector. Although the E.coli AD494 cells transformed with these constructs expressed the enzyme, no enzyme activity was detected. A1 was not secreted, either with its own signal peptide or with that of amylase A2. Expression of the A1 gene in yeast (Pichia pastoris) was conducted using the pPic9 vector, wich allows intracellular expression or secretion of this protein. The gene was amplified by PCR with forward primers, so as to amplyfy the gene sequence with or without the signal peptide. The gene containing the signal peptide was constructed with different Kozak sequences preceeding the ATG codon. For extracellular expression, the signal peptide of the pPic9 alpha factor was used. The results showed that the enzyme is expressed , but remained within the cell and do not display activity. The same constructs of the A1 gene made for P. pastoris were inserted in Baculovirus to infect Spodopera frugiperda cells. In this system, the amylase was successfully expressed and display enzymatic activity, mainly in the extracellular supernatant, using constructs of the gene with own signal peptide or with the signal peptide for amylase of Zabrotes subfasciatus. The gene A2 was expressed in the Baculovirus/Spodoptera system and the yeast P. pastoris using constructs containing the signal peptide of alpha amylase of Z. subfasciatus, the protein was secreted with activity.
3

« Ici en deux » : étude critique et génétique de l’album Matière et mémoire, ou les lithographes à l’école, de Jean Dubuffet et Francis Ponge / " Here in two " : critical and genetic study of the album Matière et mémoire, ou les lithographes à l’école, of Jean Dubuffet and Francis Ponge

Conesa, Severine 22 March 2011 (has links)
L’ouvrage que nous allons étudier est un objet singulier, objet d’art, œuvre littéraire, œuvre d’art, livre de peintre ou album, il présente au lecteur de multiples facettes. Offrant au public une collaboration inédite et captivante entre le poète Francis Ponge et le peintre Jean Dubuffet, l’ouvrage se présente comme un album de lithographies : une série de trente-quatre épreuves, composées par Jean Dubuffet de septembre à novembre 1944, sont précédées et « préfacées » par un texte de Francis Ponge. L’album, intitulé Matière et mémoire, ou les lithographes à l’école, est publié en novembre 1945 – soit exactement un an après la rencontre du peintre et du poète - à l’atelier Fernand Mourlot, il ne sera tiré qu’à une soixantaine d’exemplaires avant que ne soit détruite la pierre lithographique. Cette sorte d’ouvrage se caractérise par un certain « rapport de force » entre le texte et l’image, rapport inverse à celui qui s’opère dans le livre illustré traditionnel, puisque c’est ici l’image qui préexiste, le texte étant élaboré à partir, à cause même des lithographies. Suivant pas à pas le chemin de la genèse de l’œuvre, nous verrons comment s’est engendré ce projet, sa réalisation et la part non négligeable prise par Jean Paulhan – alors en relation et correspondance suivie avec Jean Dubuffet et Francis Ponge – dans l’élaboration de l’œuvre commune, livre de rencontre plus que de dialogue. Notre exemplaire de référence porte le numéro 22, conservé à la Bibliothèque Nationale de France ; il comporte le dossier de notes de Francis Ponge, l’invitation à l’exposition des lithographies à la Galerie André et possède une reliure originale, réalisée en 1985 par Max Leroux. / The work which we are going to present is a singular object, a work of art, a literary work, a work of art, painter's book(pound) or album, it presents to the reader of multiple facets. Offering to the public a new and fascinating collaboration between the poet Francis Ponge and the painter Jean Dubuffet, the work appears as an album of lithographies: a series of thirty four tests, consisted by Jean Dubuffet from September till November, 1944, are preceded and "introduced" by Francis Ponge's text. The album, entitled Matière et mémoire, ou les lithographes à l'école, is published in November, 1945 - exactly one year after the meeting of the painter and the poet - to the workshop Fernand Mourlot, it will be pulled only in about sixty copies before is destroyed the lithographic stone. This kind of work is characterized by a certain "balance of power" between the text and the image, report inverts to the one who takes place in the traditional illustrated book, because it is here the image which preexists, the text being elaborated to leave, before cause of lithographies. According to step by step the road of the genesis of the work, we shall see how engendered this project, its realization and the not insignificant part taken by Jean Paulhan - then in relation and correspondence followed with Jean Dubuffet and Francis Ponge - in the elaboration of the common work, a book of meeting more than dialogue. Our reference copy wears the number 22, kept by the Bibliothèque Nationale de France; it contains the file of Francis Ponge's notes, the invitation in the exhibition of lithographies in the Gallery André and possesses an original binding, realized in 1985 by Max Leroux.

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