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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.
31

Plaque erosion and murine plaque stability: a biomechanical examination of exceptions to the phenomenon of plaque rupture

Campbell, Ian Christopher 04 January 2013 (has links)
Atherosclerotic plaque disruption leading to thrombosis has traditionally been studied as a rupture of a thin fibrous cap over a lipid-laden necrotic core. However, two noteworthy categories of plaques that do not rupture have presented themselves: 1) in mice, plaque rupture is rare if not absent, and 2) in humans, some plaques erode and form a thrombus without rupturing. Current understanding of the biomechanical differences between plaques that rupture and those that do not is incomplete. In this research, we used patient-specific computational biomechanics tools to study differences among these groups. Lesion-specific solid mechanical modeling of murine plaques revealed that the relative distribution of stresses differs considerably between mice and man. In human vulnerable plaques, peak stresses are on the thin fibrous cap over a necrotic core, but in mice the highest stresses are in the media and adventitia, away from the plaque. Whereas atherosclerotic human arteries usually experience neointima formation around the entire circumference of the vessel, mouse plaques tend to be punctate and adjacent lesion-free regions. The difference in mechanical environment suggests that plaque rupture, if possible in mice, is likely not driven by mechanics in the same manner as humans. Similar mechanical modeling of human ruptured and eroded plaques and comparison to histological staining revealed that ruptured plaques exhibit increased levels of inflammatory markers in response to strain in ruptured plaques, but no such response was observed in plaque erosion. This suggests that treatment of inflammation, a current paradigm for care of atherosclerotic patients, may not be an effective approach to mediate plaque erosion. Computational fluid dynamics modeling of patients with plaque erosion revealed no relation between wall shear stress magnitude or direction, further suggesting that the mechanism of plaque erosion differs considerably from that of plaque rupture. Together, these findings suggest that biomechanics can help explain why not all plaques rupture and that different clinical approaches are necessary to address different phenotypes of lesions.
32

Analysis of HER2 testing in breast cancer

Ashok, Mahima. January 2009 (has links)
Thesis (Ph.D)--Biomedical Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Griffin, Paul; Committee Member: Butera, Robert; Committee Member: Halpern, Michael; Committee Member: Nichols, Richard; Committee Member: Vidakovic, Brani. Part of the SMARTech Electronic Thesis and Dissertation Collection.
33

An immunohistochemical study of idiopathic histiocytosis of the jaws a thesis submitted in partial fulfillment ... oral pathology and diagnosis ... /

Stewart, Jeffery C. B. January 1985 (has links)
Thesis (M.S.)--University of Michigan, 1985.
34

An immunohistochemical study of idiopathic histiocytosis of the jaws a thesis submitted in partial fulfillment ... oral pathology and diagnosis ... /

Stewart, Jeffery C. B. January 1985 (has links)
Thesis (M.S.)--University of Michigan, 1985.
35

Optimization of detection of avian influenza virus in formalin fixed tissues by immunohistochemical methods

Wong, Pik-wa, Linda., 黃碧華. January 2009 (has links)
published_or_final_version / Pathology / Master / Master of Medical Sciences
36

In vitro investigation into the role of human intrahepatic biliary epithelial cells as targets in primary biliary cirrhosis

Ayres, Reuben Christopher Simon January 1993 (has links)
No description available.
37

Immunohistochemical and ultrastructural studies of oligodendrogliomas.

January 1995 (has links)
Ko Chun-wai, Hardy. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1995. / Includes bibliographical references (leaves 107-132). / Acknowledgement --- p.3 / Declaration of originality --- p.4 / Summary of thesis --- p.5-6 / Chapter Chapter 1 --- Introduction and aims of study --- p.7-26 / Chapter Chapter 2 --- Materials and methods --- p.27-39 / Chapter Chapter 3 --- Results of study --- p.40-77 / Chapter Chapter 4 --- Discussion --- p.78-103 / Chapter Chapter 5 --- Conclusion of study --- p.104-106 / References --- p.107-132
38

Estudo dos pólipos endometriais pela imunoexpressão das proteinas p53 e PTEN

Abrão, Féres January 2016 (has links)
Orientador: Rogerio Dias / Resumo: Objetivo: Avaliar os pólipos endometriais pela imunoexpressão das proteínas p53 e PTEN como fatores preditivos para riscos de pré-malignidade e malignidade. Pacientes e Métodos: Estudo transversal com amostra por conveniência, cujos dados foram obtidos através de consultas aos prontuários no período de janeiro de 2010 a dezembro 2014 de pacientes com diagnóstico de pólipos endometriais, submetidas a histeroscopias diagnósticas e cirúrgicas/polipectomia no Setor de Endoscopia Ginecológica e Planejamento Familiar da Disciplina de Ginecologia da Faculdade de Medicina de Botucatu (UNESP) e da Clínica "Abrão" de Marília. Os pólipos endometriais foram encaminhados, em bloco de parafina, à Consultoria em Patologia Dr Carlos Bacchi para avaliação imunoistoquímica, identificando os marcadores p53 e PTEN. Todas as pacientes realizaram, previamente, ultrassonografia transvaginal e histeroscopia diagnóstica. O grupo estudado constituiu-se de 159 pacientes (n=159) com diagnóstico de pólipo confirmado pelo exame anátomo patológico. Grupo amostral: as pacientes foram divididas em 2 (dois) grupos, assim denominados: Grupo A=120 (pacientes com pólipos endometriais sem atipias) e Grupo B=39 (pacientes com pólipos endometriais com atipias). O Grupo A foi subdividido em 4 subgrupos, assim denominados: A1- imunoistoquímico p53 negativo e PTEN positivo; A2- imunoistoquímico p53 positivo e PTEN positivo; A3- imunoistoquímico p53 negativo e PTEN negativo e A4- imunoistoquímico p53 positivo e PTEN ne... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Objective: Evaluate the endometrial polyps by immune expression of p53 protein and PTEN as predictive factors for pre malignancy and malignancy risks. Patients and Methods: Transversal study with samples by convenience whose data were obtained by consulting the medical charts from January 2010 to December 2014 of patients diagnosed with endometrial polyps, submitted to a diagnostic and surgical hysteroscopy/polypectomy in the Gynaecological Endoscopy and Familiar Planning Division of the Gynaecology Discipline at Medical School of Botucatu (UNESP) and "Abrão" Clinic of Marília. The endometrial polyps, in paraffin blocks, were sent to Doctor Carlos Bacchi Pathology Advisory for immune hystochemical assessment, identifying the markers p 53 and PTEN. Previously, transvaginal ultrasonography and diagnostic hysteroscopy were done in all the patients. The studied group was made up of 159 patients (n=159) with confirmed diagnosis of polyps by anatomical pathological examination. Sample group: the patients were divided into 2 groups: Group A=120 (patients with endometrial polyps without atypias) and Group B = 39 (patients with endometrial polyps with atypias). Group A was subdivided into 4 sub groups: A1- immune hystochemical p53 negative and PTEN positive; A2- immune hystochemical p53 positive and PTEN positive; A3- immune hystochemical p53 negative and PTEN negative and A4- immune hystochemical p53 positive and PTEN negative. Group B was subdivided into 4 sub groups: B1- immune hys... (Complete abstract click electronic access below) / Doutor
39

Immunohistochemistry of the Gills of the Channel Catfish Ictalurus Punctatus: Cells and Neurochemicals That May Be Involved in the Control of Cardioventilatory Reflexes

Oden, David S. 12 1900 (has links)
In teleost fishes the neurochemicals involved in sensing and responding to hypoxia are unresolved. Serotonergic branchial neuroepithelial cells (NECs) are putative O2 chemoreceptors believed to be homologous to the neural crest (NC) derived APUD (amine-precursor uptake and decarboxylation) pulmonary NECs and carotid body type-1 glomus cells. Branchial NECs contain serotonin (5-HT), thought to be central to the induction of the hypoxic cardioventilatory reflexes. However, application of 5-HT in vivo does not elicit cardioventilatory reflexes similar to those elicited by hypoxia. But previous in vitro neural recordings from glossopharyngeal (IX) afferents innervating O2 chemoreceptors in the trout gill show the same discharge response to hypoxic conditions as does that of acetylcholine (ACh) application. This evidence strongly supports the cholinergic hypothesis of chemoreceptor impulse origin rather than a serotonergic-induced impulse origin model. We therefore hypothesized that NECs contain ACh among other neurochemicals in cells belonging to the APUD series. Although serotonergic branchial NECs did not colocalize with ACh using immunohistochemical methods, several populations of ACh and/or tyrosine hydroxylase (TH) (catecholaminergic) positive, dopamine (DA) negative, cells were found throughout the second gill arch of the channel catfish Ictalurus punctatus. In addition, the NC derivation marker zn-12 labelled the HNK-1-like epitope (Human natural killer) expressed by lamellar pillar cells’ collagen column-associated pillar cell adhesion molecules (CC-PCAMs), evidence confirming their hypothesized NC origin.
40

Immunohistochemical study of marmoset periodontal ligament microvasculature : a confocal laser scanning microscopic study

Ashworth, Jonathan F. January 1999 (has links) (PDF)
Bibliography: leaves 110-120. Reports immunohistochemical investigations into the biological response to the application of an orthodontic force to the buccal segment teeth of marmosets.

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