Global ETD Search

41	Synthesis and Characterization of Novel Flavonoid-Based Fluorescent Sensors and other Sensors with Excited State Intramolecular Proton Transfer for Biological Applications McDonald, Lucas J. 23 May 2018 (has links) No description available. Chemistry Biology ESIPT AIE zebrafish sarcomere aluminum zinc pyrophosphate ER flavonoid chemical sensors molecular probes HSA BSA native mass spectrometry fluorescence UV-vis neuromasts hair cells support cells
42	TGFΒ/SMAD4 Signaling and Altered Epigenetics Contribute to Increased Ovarian Cancer Severity Deatherage, Daniel E. 27 July 2011 (has links) No description available. Bioinformatics Biology Biomedical Research Cellular Biology Molecular Biology Ovarian Cancer Epigenetics DNA hypermethylation hsa-mir-9-3 Cisplatin resistance CLDN11 TGF&914 SMAD4 ChIP-sequencing Survival data
43	Contributions aux études quantitatives par spectroscopies électroniques (EPES et XPS) : Applications aux surfaces nanostructurées / Contributions to quantitative studies by electron spectroscopy (EPES & XPS) : Applications to nanostructured surfaces Mahjoub, Mohamed Aymen 19 January 2016 (has links) Ce travail porte sur le développement de nouvelles méthodes de caractérisation in-situ basées sur les spectroscopies électroniques XPS et MM-EPES associées à des calculs théoriques obtenus grâce à des simulations Monte-Carlo afin de réaliser des études quantitatives fines et précises. La première partie de ce travail, a été consacrée à l’analyse quantitative de signaux XPS et MM-EPES. Pour cela, dans un premier temps, la fonction de correction de l’analyseur hémisphérique (HSA) qui est une combinaison de l’aire d’analyse (A) et de la transmission (T) a été déterminée en utilisant une nouvelle méthode basée sur des images élastiques. Pour la première fois, la dépendance de A en énergie cinétique des électrons a été mise en évidence. Avec l’utilisation de cette nouvelle fonction, une méthode de caractérisation in situ basée sur la modélisation théorique des signaux XPS et MM-EPES a été développée. Cette méthode a permis d’étudier le dépôt d’un film d’or sur un substrat de silicium oxydé et a montré une grande précision dans le cas de très faibles quantités de matière déposée (< 2 nm) alors que les techniques microscopiques classiques se sont révélées inefficaces. La deuxième partie a porté sur le développement d’une nouvelle technique d’imagerie in-situ appelé MM-EPEM qui consiste à scanner la surface par un faisceau d’électrons et de collecter les électrons rétrodiffusés élastiquement afin de construire une image en intensité de la surface. Les étapes d’obtention des images MM-EPEM et les procédures d’exploitation de ces dernières ont été décrites et optimisées. Ensuite, cette technique a été utilisée pour l’étude de l’état de surface de dépôts d’or sur différents substrats. Cette technique s’avère être non destructive et très sensible aux éléments présents à la surface. Et elle permet de déterminer la cartographie chimique et la nano-organisation de la surface. / This thesis focuses on the development of new in-situ methods of characterization based on the electron spectroscopies (XPS and EPES) coupled with theoretical calculations obtained through Monte-Carlo simulations in order to perform very precise quantitative studies. The first part of this thesis was devoted to quantitative studies of XPS and MM-EPES measurements. Firstly, the correction function of a hemispherical analyzer (HSA) which is a combination of the analysis area (A) and the transmission (T) was determined using a new method based on the elastic images. For the first time, the dependence of A on the kinetic energy of electrons was highlighted. Using this function, an in-situ method based on the combination of XPS and MM-EPES modeling was setting up. This method was used to determine the organization of gold film deposed on oxidized silicon substrate. Measurements show that this method is able to determine surface parameters when the microscopy techniques do not give any information in the case of a small quantity of gold deposit (less than 2 nm). The second part of this work was directed towards developing a new generation of microscopy called MM-EPEM which is based on the detection of elastic electrons. The stages required to obtain these images are well described and optimized here. The MM-EPEM images processing was used to study gold growth on different substrates. This technique is a non-destructive method and allows the operator to construct chemical tomography and to determine the nano-organization of the surface. Spectroscopies électroniques XPS MM-EPES Interactions électrons-matière Fonction de correction Analyseur hémisphérique (HSA) Simulation Monte-Carlo Etudes quantitatives Microscopie MM-EPEM Electronic spectroscopy XPS MM-EPES Electron-matter interaction Correction function Hemispherical analyzer (HSA) Monte-Carlo simulation Quantitative studies MM-EPEM microscope
44	The Effect of hsa-miR-105 on Prostate Cancer Growth Honeywell, David R 07 December 2012 (has links) Micro (mi)RNAs have recently been found to play an important role in cancer biology. In order to further understand how miRNAs affect prostate tumour progression, we evaluated miRNA expression in two invasive prostate tumour lines, PC3 and DU145. We then focused our evaluation on a novel miRNA, miR-105, whose levels were significantly decreased in both tumour cell lines as compared to normal prostate epithelial cells. As miR-105 levels were reduced in prostate tumour cell lines, we restored its expression following transfection of cells with mimic constructs to over-express miR-105 in both cell lines, in order to determine its effect on various tumourigenic properties. Over-expression caused decreased tumour cell proliferation, anchorage-independent growth and invasion in vitro and inhibited tumour growth in vivo. We further identified CDK6 as a putative target of miR-105, which likely contributed to its inhibition of tumour cell growth. Our results suggest that miR-105 inhibits tumour cell proliferation and may be an interesting target to regulate tumour growth or potentially used as a biomarker to differentiate between less and more aggressive tumours in patients. microRNA miRNA hsa-miR-105 cancer prostate cancer PC3 DU145 prostate cancer growth cancer cell proliferation cancer cell anchorage-independent growth cancer cell migration and invasion CDK6
45	The Effect of hsa-miR-105 on Prostate Cancer Growth Honeywell, David R 07 December 2012 (has links) Micro (mi)RNAs have recently been found to play an important role in cancer biology. In order to further understand how miRNAs affect prostate tumour progression, we evaluated miRNA expression in two invasive prostate tumour lines, PC3 and DU145. We then focused our evaluation on a novel miRNA, miR-105, whose levels were significantly decreased in both tumour cell lines as compared to normal prostate epithelial cells. As miR-105 levels were reduced in prostate tumour cell lines, we restored its expression following transfection of cells with mimic constructs to over-express miR-105 in both cell lines, in order to determine its effect on various tumourigenic properties. Over-expression caused decreased tumour cell proliferation, anchorage-independent growth and invasion in vitro and inhibited tumour growth in vivo. We further identified CDK6 as a putative target of miR-105, which likely contributed to its inhibition of tumour cell growth. Our results suggest that miR-105 inhibits tumour cell proliferation and may be an interesting target to regulate tumour growth or potentially used as a biomarker to differentiate between less and more aggressive tumours in patients. microRNA miRNA hsa-miR-105 cancer prostate cancer PC3 DU145 prostate cancer growth cancer cell proliferation cancer cell anchorage-independent growth cancer cell migration and invasion CDK6
46	Bioanalytical Applications of Intramolecular H-Complexes of Near Infrared Bis(Heptamethine Cyanine) Dyes Kim, Junseok 15 July 2008 (has links) This dissertation describes the advantages and feasibility of newly synthesized near-infrared (NIR) bis-heptamethine cyanine (BHmC) dyes for non-covalent labeling schemes. The NIR BHmCs were synthesized for biomolecule assay. The advantages of NIR BHmCs for biomolecule labeling and the instrumental advantages of the near-infrared region are also demonstrated. Chapter 1 introduces the theory and applications of dye chemistry. For bioanalysis, this chapter presents covalent and non-covalent labeling. The covalent labeling depends on the functionality of amino acids and the non-covalent labeling relies on the binding site of a protein. Due to the complicated binding process in non-covalent labeling, this chapter also discusses the binding equilibria in spectroscopic and chromatographic analyses. Chapter 2 and 3 evaluate the novel BHmCs for non-covalent labeling with human serum albumin (HSA) and report the influence of micro-environment on BHmCs. The interesting character of BHmCs in aqueous solutions is that the dyes exhibit non- or low-fluorescence compared to their monomer counterpart, RK780. It is due to their H-type closed clam-shell form in the solutions. The addition of HSA or organic solvents opens up the clam-shell form and enhances fluorescence. The binding equilibria are also examed. Chapter 4 provides a brief introduction that summaries the use of capillary electrophoresis (CE), and offers a detailed instrumentation that discusses the importance and advantage of a detector in NIR region for CE separation. Chapter 5 focuses on the use of NIR cyanine dyes with capillary electrcophoresis with near-infrared laser induce fluorescence (CE-NIR-LIF) detection. The NIR dyes with different functional groups show that RK780 is a suitable NIR dye for HSA labeling. The use of BHmCs with CE-NIR-LIF reduces signal noises that are commonly caused by the interaction between NIR cyanine dyes and negatively charged capillary wall. In addition, bovine carbonic anhydrase II (BCA II) is applied to study the influence of hydrophobicity on non-covalent labeling. Finally, chapter 6 presents the conformational dependency of BHmCs on the mobility in capillary and evaluates the further possibility of BHmCs for small molecule detection. Acridine orange (AO) is used as a sample and it breaks up the aggregate and enhances fluorescence. The inserted AO into BHmC changes the mobility in capillary, owing to the conformational changes by AO. Clam-shell Form Capillary Electrophoresis (CE) Laser Induce Fluorescence (LIF) Bovine Carbonic Anhydrase II (BCA II) Acridine Orange (AO) Human Serum Albumin (HSA) Binding Equilibria Covalent Labeling Non-covalent Labeling Bis-heptamethine Cyanine (BHmC) Near-infrared (NIR)
47	Synthèse de nanoparticules hybrides de type coeur-coquille à visées théranostiques / Synthesis of hybrid core-shell nanoparticles for theranostic applications Ménard, Mathilde 06 June 2017 (has links) Le but de ce travail de thèse a été de synthétiser de nouveaux nano-objets pour le diagnostic et le traitement du cancer. Ainsi, nous avons développé des nanoparticules hybrides constituées d'un noyau inorganique recouvert d'une couche organique de sérum albumine humaine (HSA). Le noyau inorganique est un composite constitué d'un cœur d'oxyde de fer (IO) et d'une coquille de silice mésoporeuse (MS). L’IO permet, grâce à ses propriétés magnétiques, le diagnostic par imagerie par résonance magnétique (IRM) et la thérapie par hyperthermie magnétique (HM), tandis que les porosités de la MS permettent l’encapsulation de médicaments pour la chimiothérapie. La taille des pores de la coquille MS a été modulée afin d’augmenter le taux d’encapsulation en médicament et la taille du cœur d’IO a été ajustée pour améliorer les propriétés d’HM et d'IRM. L'utilisation d’un revêtement final d’HSA en tant que gatekeeper pour la délivrance de médicaments contrôlée par action enzymatique a également été étudiée. En parallèle, des nanocapsules d’HSA chargées en médicament ont été synthétisées. Enfin, les activités biologiques de ces nanoparticules ont été testées sur différentes lignées cellulaires cancéreuses. / The aim of this PhD work was to synthesize and test new nano-objects for the diagnosis and treatment of cancer. For this purpose, we developed hybrid nanoparticles made of an inorganic core surrounded by a human serum albumin (HSA) organic coating. The inorganic core is a composite by itself as it is made of an iron oxide core (IO) surrounded by a mesoporous silica (MS) shell. The IO core ensures, through its magnetic properties, diagnosis by magnetic resonance imaging (MRI) and therapy by magnetic hyperthermia, whereas the MS shell allows the loading of anticancer drugs for chemotherapy within its porosities. The pore sizes of the silica shell were modulated to enhance the drug loading content and the IO core size was also tuned to improve magnetic hyperthermia as well as T2 MRI imaging properties of the final core-shell system. The use of a thick shell of HSA as gatekeeper for controlled drug delivery triggered by its degradation with proteases was also studied. In parallel the synthesis of drug loaded HSA nanocapsules using MS as sacrificial template was performed. Finally, the biological activities of these nanoparticles were tested on various cancer cell lines. Nanoparticules Théranostique Cœur-coquille Oxyde de fer Silice mésoporeuse Nanocapsule d’HSA Albumine IRM Hyperthermie magnétique Délivrance contrôlée de médicaments Nanoparticles Theranostic Core-shell Iron oxide Mesoporous silica HSA nanocapsule Albumin MRI Magnetic hyperthermia Controlled drug release 541.3
48	The Effect of hsa-miR-105 on Prostate Cancer Growth Honeywell, David R January 2012 (has links) Micro (mi)RNAs have recently been found to play an important role in cancer biology. In order to further understand how miRNAs affect prostate tumour progression, we evaluated miRNA expression in two invasive prostate tumour lines, PC3 and DU145. We then focused our evaluation on a novel miRNA, miR-105, whose levels were significantly decreased in both tumour cell lines as compared to normal prostate epithelial cells. As miR-105 levels were reduced in prostate tumour cell lines, we restored its expression following transfection of cells with mimic constructs to over-express miR-105 in both cell lines, in order to determine its effect on various tumourigenic properties. Over-expression caused decreased tumour cell proliferation, anchorage-independent growth and invasion in vitro and inhibited tumour growth in vivo. We further identified CDK6 as a putative target of miR-105, which likely contributed to its inhibition of tumour cell growth. Our results suggest that miR-105 inhibits tumour cell proliferation and may be an interesting target to regulate tumour growth or potentially used as a biomarker to differentiate between less and more aggressive tumours in patients. microRNA miRNA hsa-miR-105 cancer prostate cancer PC3 DU145 prostate cancer growth cancer cell proliferation cancer cell anchorage-independent growth cancer cell migration and invasion CDK6
49	Synthesis, Biological Functionalization, and Integration ofCarbon Nanotubes for Bio-Sensing Textiles Olszewski, Amy L. 03 June 2013 (has links) No description available. Biochemistry Biology Chemical Engineering Chemistry Engineering Materials Science Nanoscience Nanotechnology Textile Research Technology Carbon nanotubes CNT human serum albumin HSA blood detection covalent functionalization carbodiimide phage display smart textiles sensors biological functionalization peptide
50	Identifizierung genetischer Biomarker für die Wirksamkeit von Oxaliplatin:Kandidatengen-bezogene und Genom-weite Analysen / Identification of genetic biomarkers for the efficacy of oxaliplatin - candidate gene and genome-wide approaches Saman, Sadik 02 December 2014 (has links) No description available. 610 Oxaliplatin Kolorektales Karzinom Cisplatin Carboplatin rs11793978 rs74382821 micro-RNA hsa-miR-1277-3p individualisierte Therpaie Genom-weite Analyse ERCC1 ERCC2 ERCC5 Zytotoxizität CFSE Vybrant Ruby Sytox Zellproliferation Zellvitalität Proliferationshemmung DACH-Ligand SLC31A1 LCL lymphoblastoide Zelllinien 1000 human genomes HapMap Intron 1 SLC31A1 lymphoblastoid cell lines ERCC1 SLC31A1 rs74382821 rs11793978 genome-wide HapMap 1000 human genomes cisplatin carboplatin micro-RNA hsa-miR-1277-3p colorectal carcinoma ATP7A ATP7B Oxaliplatin cytotoxocity cell vitality cell proliferation Sytox Vybrant Ruby CFSE counting beads LCL Intron 1 SLC31A1 Medizin (PPN619874732)

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