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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

One step germline immunoglobulin genes retrieval and diversity enhancement for scFv library construction. / CUHK electronic theses & dissertations collection

January 2004 (has links)
Cheng Man. / "August 2004." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (p. 236-256) / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
2

The adaptive immune system of sea lamprey

Alder, Matthew N. January 2008 (has links) (PDF)
Thesis (Ph.D.)--University of Alabama at Birmingham, 2008. / Title from first page of PDF file (viewed on June 23, 2009). Includes bibliographical references.
3

Lactobacilli expressing antibody fragments against pathogens /

Hultberg, Anna, January 2006 (has links)
Diss. (sammanfattning) Stockholm : Karolinska institutet, 2006. / Härtill 4 uppsatser.
4

Passive immunization against oral pathogens /

Krüger, Carina, January 2004 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2004. / Härtill 5 uppsatser.
5

The potential role of VH replacement in editing and generating autoreactive antibodies

Fan, Run. January 2009 (has links) (PDF)
Thesis (Ph.D.)--University of Alabama at Birmingham, 2009. / Title from PDF title page (viewed on July 16, 2010). Includes bibliographical references.
6

An entirely cell-based system to generate single-chain antibodies against cell surface receptors.

Lipes, BD, Chen, YH, Ma, H, Staats, HF, Kenan, DJ, Gunn, MD 30 May 2008 (has links)
The generation of recombinant antibodies (Abs) using phage display is a proven method to obtain a large variety of Abs that bind with high affinity to a given antigen. Traditionally, the generation of single-chain Abs depends on the use of recombinant proteins in several stages of the procedure. This can be a problem, especially in the case of cell-surface receptors, because Abs generated and selected against recombinant proteins may not bind the same protein expressed on a cell surface in its native form and because the expression of some receptors as recombinant proteins is problematic. To overcome these difficulties, we developed a strategy to generate single-chain Abs that does not require the use of recombinant protein at any stage of the procedure. In this strategy, stably transfected cells are used for the immunization of mice, measuring Ab responses to immunization, panning the phage library, high-throughput screening of arrayed phage clones, and characterization of recombinant single-chain variable regions. This strategy was used to generate a panel of single-chain Abs specific for the innate immunity receptor Toll-like receptor 2. Once generated, individual single-chain variable regions were subcloned into an expression vector allowing the production of recombinant Abs in insect cells, thus avoiding the contamination of recombinant Abs with microbial products. This cell-based system efficiently generates Abs that bind to native molecules on the cell surface, bypasses the requirement of recombinant protein production, and avoids risks of microbial component contamination. / Dissertation
7

Untersuchung entfernt lokalisierter Gewebeproben kutaner B-Zell-Lymphome auf intraklonale Diversität mit der Einzel-Zell-PCR-Technik

Jacobs, Claudia 17 July 2000 (has links)
Zusammenfassung Die molekularbiologischen Untersuchungen der variablen Genabschnitte der Immunglobulingene von Lymphomzellen zweier Patienten mit kutanen B-Zell-Lymphomen wurden in der vorliegenden Arbeit mittels Einzel-Zell-PCR-Technik durchgeführt. Die erfolgte Analyse galt bevorzugt dem Aspekt der intraklonalen Diversität. Die Sequenzanalysen der Ig-Gene für die leichte Kette aus den insgesamt 100 untersuchten Tumorzellen des Patienten WS ergaben, daß zwischen den Zellen aus drei voneinander entfernt lokalisierten Gewebeproben intraklonale Diversität vorlag. Aufgrund der Mutationsanalysen und der Zuordnung der Subklone zu den Entnahmeorten ist eine evtl. antigengetriebene Entwicklung des Tumorklons zu vermuten. Bei Patient LB konnte trotz des großen Aufwandes, der Untersuchung von insgesamt 126 Zellen aus acht räumlich getrennten Biopsien, keine intraklonale Diversität für die schwere Kette der Immunglobulingene aufgezeigt werden. Die Sequenzunterschiede der leichten Kette beruhen auf einer einzigen stummen Mutation im Bereich der CDR 1, die keinen funktionellen Einfluß auf die Aminosäuresequenz hat und deshalb geringe prognostische Bedeutung besitzt. In beiden Fällen lagen hypermutierte Immunglobulingene vor. Die Tumorzellen des Patienten WS sind aus molekularbiologischer Sicht Keimzentrumszellen, die des Patienten LB eher Nachkeimzentrumszellen zuzuordnen. Die gewonnenen Erkenntnisse zeigen, daß bei der Untersuchung und Erforschung der Pathogenese von kutanen B-Zell-Lymphomen eine gewonnene Gewebeprobe nicht repräsentativ für den gesamten Tumor sein muß. Veröffentliche Ergebnisse, bei denen Monoklonalität anhand einer Biopsie postuliert wurde, müssen daher initial überdacht werden (74;76;77;84). Es ist folglich in Betracht zu ziehen, daß bei einer exakten molekularbiologischen Zuordnung der Tumorzellen zu ihrem Entwicklungsstadium und ihrer Herkunft räumliche als auch zeitliche Faktoren zu beachten sind. Eine chronologische Untersuchung könnte aufzeigen, ob andauernde Mutationen in den Tumorzellen stattfinden. Die Mikromanipulation und die Einzel-Zell-PCR-Technik sind elegante Methoden, um intraklonale Sequenzunterschiede aufzuzeigen und einen Beitrag für die molekularbiologische Erforschung der Pathogenese von kutanen B-Zell-Lymphomen zu leisten. Eine Kontrolle von malignoproliferativen Krankheiten, ob es unter den heutigen Therapiemöglichkeiten gelingt, den malignen Tumorklon vollständig zu beseitigen oder Aussagen über Progredienz und Prognose zu treffen, wäre ein interessanter Einsatzbereich dieser Methode. / abstract The molecularbiological investigation of the immunoglobulin variable region genes of two patients suffering on primary cutaneous B-cell-lymphoma was carried out using single-cell- PCR technic. The main focus lay on the aspect on the aspect of detecting intraclonal diversity. The sequence nucleotid-analysises of the immunoglubulin light chain genes obtained from a total of 100 investigated tumor B-cells in patient WS revealed intraclonal diversity among cells isolated from three spatially separated tissue samples. Considering the mutational pattern and the subclones in dependence on the tumorcells, taken from different topographical tumorsides, an antigen-driven clonal expansion could be supposed. Despite extensive efforts and the analysis of altogether 126 tumor B-cells out of eight spatially different localised biopsies, no intraclonal diversity could be observed for the immunoglobulin heavy chain rearrangement of second patient LB. Sequence differences of the Ig light chain based on only a single silent mutation within the CDR1 region. This mutation has no functional affect of the amino acid sequence and therefore little prognostical significance. In both cases the immunoglobulin genes were somatically hypermutated in compromise to the germ-line gene. From the molecularbiological point of view, the tumor cells of patient WS descended from germinal center cells, whereas the tumor B-cells of patient LB rather can be characterized as post-germinal center cells. The results clearly demonstrate, that the investigation of a single tissue sample of primary cutaneous B-cell lymphoma using micromanipulation and single cell-PCR technic may not be representative for the whole tumor. Publications concluding monoclonality with no intraclonal diversity from the analysis of a single biopsie therefore have to be interpreted with caution (74;76;77;84). Accordingly, an appropiate molecularbiological characterization of tumor B-cells regarding their developmental stage and origin has to consider spatial and time dependant aspects. Only the investigation of sequential biopsies may reliably detect ongoing mutations in tumor B-cells. The combination of micromanipulation and single cell PCR represents an elegant method to observe intraclonal diversity. The technic will give contribution to molecularbiological investigation of the pathogenesis of primary cutaneous B-cell lymphomas. It could be of interest to apply this method to the evaluation of current therapies with respect to its capability to eradicating the malignant cell clone completely, and to draw conclusions on disease progression and prognosis.
8

Immunoglobulin gene analysis in different B cell lymphomas : with focus on cellular origin and antigen selection /

Thorsélius, Mia, January 2004 (has links)
Diss. (sammanfattning) Uppsala : Univ., 2004. / Härtill 5 uppsatser.

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