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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

The pattern of initiation in the Chinese hamster DHFR origin of replication /

Wang, Shuntai. January 1998 (has links)
Thesis (Ph. D.)--University of Virginia, 1998. / Spine title: Study of DHFR DNA replication origin. Includes bibliographical references (p. 152-168). Also available online through Digital Dissertations.
2

Sequence requirements of early firing origin activity in the dihydrofolate reductase locus of Chinese hamster ovary cells /

Shan, Yujie. January 2000 (has links)
Thesis (Ph. D.)--University of Virginia, 2000. / Includes bibliographical references (leaves 162-178). Also available online through Digital Dissertations.
3

Efeitos da glicina na mucosite oral induzida por 5-fluorouracil em hamster / Effects of the glycine in the oral mucositis induced by 5-fluorouracil in hamsters

Sá, Odara Maria de Sousa [UNIFESP] 28 July 2010 (has links) (PDF)
Made available in DSpace on 2015-07-22T20:49:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-07-28 / Mucosite oral é complicação comum no tratamento do câncer. A glicina demonstra efeito antiinflamatório, imunomodulador e citoprotetor. Este estudo tem como objetivo avaliar os efeitos da suplementação de glicina na reparação da mucosite oral induzida por 5-fluorouracil em hamster. Os animais foram divididos em dois grupos: grupo experimental (GI; n=20) e grupo controle (GII; n=20) ambos receberam injeção intraperitoneal de 5-fluorouracil no 1° e 3° dia. Os animais tiveram a sua bolsa jugal direita evertida e arranhada superficialmente no dia 3. O Grupo I, foi submetido ao tratamento com glicina a 5% por infusão intraperitoneal durante 7 dias e o Grupo II, recebeu placebo. A mucosa do GI e GII foi avaliada clinicamente, por meio de escore, no D3 e D7. Ao final do experimento a bolsa jugal dos animais de ambos os grupos foi retirada e avaliada segundo parâmetros histopatológicos e bioquímicos. Os grupos I e II apresentaram acentuado processo inflamatório durante o período inicial, segundo a avaliação clínica. No GI houve redução da severidade da mucosite, diminuição do processo inflamatório, cicatrização acelerada e redução da peroxidação lipídica quando comparado ao GII no final do experimento (p < 0,001). A suplementação com glicina demonstrou ser promissor instrumento para tratamento da mucosite, devido aos seus efeitos no processo inflamatório. Palavras chaves: Glicina; Estomatite; Fluoruracila; Cricetulus. / Oral mucositis is common complication in cancer treatment. Glycine shows a anti-inflammatory, immunomodulatory and cytoprotective. This study aims to evaluate the effects of supplementation of glycine in the repair of oral mucositis induced by 5-fluorouracil in hamsters. The animals were divided into two groups: experimental group (GI, n = 20) and control group (GII, n = 20) both received intraperitoneal injection of 5-fluorouracil in the days 1 and 3. The animals had their right pouch everted and scratched the surface on day 3. Group I was treated with glycine 5% by intraperitoneal infusion for 7 days and Group II, not supplemented. The mucosa of the GI and GII was evaluated clinically, by scoring in D3 and D7. At the end , the cheek pouch of animals from both groups was removed and evaluated by histopathological parameters and biochemical . Groups I and II showed marked inflammatory process during the initial period, according to clinical evaluation. In GI decreased the severity of mucositis, reduction of inflammation, accelerated healing and decreased lipid peroxidation when compared to GII at the end of the experiment. Supplementation with glycine proves to be a promising tool for treatment of mucositis due to its effectson the inflammatory process. / TEDE / BV UNIFESP: Teses e dissertações
4

Identifying the genetic elements for initiation of DNA replication in the Chinese hamster dihydrofolate reductase locus /

Li, Xiaomei. January 2001 (has links)
Thesis (Ph. D.)--University of Virginia, 2000. / Spine title: Initiation of DNA replication. Department of Biochemistry and Molecular Genetics. Includes bibliographical references (142-171). Also available online through Digital Dissertations.
5

Mapping replicator elements and the sites of initiation of DNA synthesis in the dihydrofolate reductase locus of Chinese hamster ovary cells /

Kalejta, Robert Francis. January 1997 (has links)
Thesis (Ph. D.)--University of Virginia, 1997. / Spine title: Mammalian DNA replication initiation. Includes bibliographical references (219-245). Also available online through Digital Dissertations.
6

Influência da carga parasitária e do sítio de inoculação na imunopatogênese da leishmaniose cutânea causada por Leishmania braziliensis em hamster / Investigate the influence of parasite burden and the inoculation site in the immunopathogenesis of cutaneous leishmaniasis caused by Leishmania braziliensis in hamster

Fonseca, Francisco Rafael Marciano 22 February 2016 (has links)
FONSECA, F. R. M. Influência da carga parasitária e do sítio de inoculação na imunopatogênese da leishmaniose cutânea causada por Leishmania braziliensis em hamster. 2016. 90 f. Dissertação (mestrado em Patologia) - Faculdade de Medicina, Universidade Federal do Ceará, Fortaleza, 2016. / Submitted by Erika Fernandes (erikaleitefernandes@gmail.com) on 2017-01-18T13:12:30Z No. of bitstreams: 1 2016_dis_frmfonseca.pdf: 2138163 bytes, checksum: 3e062bb4c798155f09a76054e3bb8348 (MD5) / Approved for entry into archive by Erika Fernandes (erikaleitefernandes@gmail.com) on 2017-01-18T13:12:38Z (GMT) No. of bitstreams: 1 2016_dis_frmfonseca.pdf: 2138163 bytes, checksum: 3e062bb4c798155f09a76054e3bb8348 (MD5) / Made available in DSpace on 2017-01-18T13:12:38Z (GMT). No. of bitstreams: 1 2016_dis_frmfonseca.pdf: 2138163 bytes, checksum: 3e062bb4c798155f09a76054e3bb8348 (MD5) Previous issue date: 2016-02-22 / Leishmania braziliensis is the main causative agent of cutaneous leishmaniasis in Brazil and despite its importance for public health, there is a lack of an experimental model that can be used for testing new therapies and vaccines. The aim of this study was to investigate the influence of parasite burden and the inoculation site in the immunopathogenesis of cutaneous leishmaniasis caused by Leishmania braziliensis in hamsters using ear dermis infection model. Groups of animals (n = 48) were infected intradermally in the ear (n = 24) or paw (n = 24) with 105 promastigotes of L. braziliensis. Afterwards, other groups of animals (n=32) were infected intradermally in the ear with 105 (n=16) or 106 (n=16) promastigotes. The lesions were measured every 5 days for 60 days. The animals were euthanized at 30, 45 and 60 d.p.i., and had their infected ears and paws, as well as lymph nodes (retromaxilar or popliteal), livers and spleens collected for evaluation of parasite burden and expression of inflammatory mediators, and analysis of histopathological changes. The lesions arose at 20 d.p.i. both paw and ear. The ear lesions ulcerated and were bigger (p< 0.0001) in contrast to paw lesions that presented themselves as small nodules without ulcers. It was observed significant parasitic burden in the ear after 30, 40 and 60 d.p.i. at the lesion and in the lymph node, with parasite burden being always bigger at the lesion. Regardless of the route of inoculation, neither liver and spleen were enlarged nor had lumps or parasites. In the retromaxillary lymph node, it was observed a greater expression of inflammatory cytokines IFN- ɣ, TNF- α and IL -6 and the enzyme arginase, 30 and 60 d.p.i., and it was corroborated by histological changes observed in the ear, intenser inflammatory process and chronicity of the disease. On the contrary, the popliteal lymph node (paw) presented a combination of pro and anti-inflammatory cytokines indicating a precocious regulation of immune and inflammatory response. It was also observed that the bigger the inoculum, the more intense the inflammatory response and bigger the lesions, however, without parasite dissemination to the liver and spleen, indicating lesser systemic commitment and increased survival time of the animal. In short, the data indicates that the inoculum of 105 parasites through the ear dermis infection model could make easier the visualization of a possible protective effect of new drugs or vaccine candidates. / Leishmania braziliensis é o principal agente causador de leishmaniose cutânea no Brasil, e apesar de sua importância para a Saúde Pública, há carência de um modelo experimental que possa ser usado para testar novas terapias e vacinas. O objetivo deste estudo foi investigar a influência da carga parasitária e do sítio de inoculação na imunopatogênese da leishmaniose cutânea causada por Leishmania braziliensis em hamster no modelo de infecção na derme da orelha. Grupos de animais (n=48) foram infectados por via intradérmica, na orelha (n=24) ou na pata (n=24), com 105 promastigotas de L. braziliensis. Em seguida, outros grupos de animais (n=32) foram infectados por via intradérmica na orelha, com 105 (n=16) ou 106 (n=16) promastigotas. As lesões foram medidas a cada 5 dias por 60 dias. Os animais foram eutanasiados com 30, 45 e 60d.p.i, e coletados a orelha e pata infectada, linfonodos (retromaxilar ou poplíteo), fígado e baço, para a avaliação da carga parasitária, expressão de mediadores inflamatórios e análise das alterações histopatológicas. As lesões surgiram com 20d.p.i., tanto na pata como na orelha. As lesões na orelha ulceraram e foram maiores (p<0,0001) ao contrário das lesões da pata, que se apresentaram como pequenos nódulos, sem úlceras. Na orelha foi observada significante carga parasitária após 30, 40 e 60d.p.i., tanto na lesão como no linfonodo, sendo a carga parasitária sempre maior na lesão. Independente da via de inoculação, o fígado e baço não estavam aumentados, não apresentavam nódulos e nem parasitos. No linfonodo retromaxilar, observou-se uma maior expressão das citocinas inflamatórias IFN-ɣ, TNF-α e IL-6 e da enzima arginase, com 30 e 60d.p.i., e isso foi corroborado com as alterações histológicas observadas na orelha, processo inflamatório mais intenso e cronicidade da doença. Ao contrário, no linfonodo poplíteo (pata), apresentou um misto de citocinas inflamatórias e anti-inflamatórias, sugerindo uma regulação bem precoce da resposta imunológica e inflamatória. Observou-se também que quanto maior o inóculo, mais intensa a resposta inflamatória e maiores as lesões, entretanto, sem disseminação do parasito para fígado e baço, sugerindo menor comprometimento sistêmico e maior tempo de sobrevida para o animal. Em suma, os dados indicam que o inóculo de 105 parasitos no modelo de infecção na orelha poderia facilitar a visualização de um possível efeito protetor de novos fármacos ou candidatos vacinais.
7

Determination of the transmembrance topology of mammalian SLC11A2 by an epitope mapping approach

Czachorowski, Maciej. January 1900 (has links)
Thesis (M.Sc.). / Written for the Dept. of Biochemistry. Title from title page of PDF (viewed 2009/06/23). Includes bibliographical references.
8

Modification of the duocarmycin pharmacophore enables CYP1A1 targeting for biological activity

Pors, Klaus, Loadman, Paul, Shnyder, Steven, Sutherland, Mark, Sheldrake, Helen M., Guino, M., Kiakos, K., Hartley, J.A., Searcey, M., Patterson, Laurence H. January 2011 (has links)
The identification of an agent that is selectively activated by a cytochrome P450 (CYP) has the potential for tissue specific dose intensification as a means of significantly improving its therapeutic value. Towards this goal, we disclose evidence for the pathway of activation of a duocarmycin analogue, ICT2700, which targets CYP1A1 for biological activity.

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