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Articles 1 - 18 of 18
Full-Text Articles in Nanotechnology
The Application Of Macrophage-Targeted, Anti-Inflammatory Celecoxib Nanoemulgel For Nerve Regeneration In Peripheral Nerve Injury, Lu Liu
Electronic Theses and Dissertations
Peripheral nerve injury (PNI) refers to damage to the nerve located outside the brain and spinal cord. PNI is commonly caused by a physical accident (trauma) or medical operation1, 2. The impact on the quality of life of PNI patients is directly correlated to neuropathic pain, resultant depression, and increased stress2. Even after recovering from the PNI, patients still experience phantom pain and lose the ability to work due to the loss of tactile sensory or motor function2-4. However, unlike damage to the central nervous system (CNS), peripheral nerves can regenerate because macrophages clean …
Exosomal Cannabidiol: A Promising Candidate For Targeted Oral Delivery Against Breast Cancer., Disha Nagesh Moholkar
Exosomal Cannabidiol: A Promising Candidate For Targeted Oral Delivery Against Breast Cancer., Disha Nagesh Moholkar
Electronic Theses and Dissertations
Cancer therapies are limited by lack of specificity, selectivity and numerous adverse effects. Repurposing potential anticancer compounds with appropriate drug carriers can help overcome these drawbacks. In our present study, we address the major obstacle for cannabidiol (CBD): its low oral bioavailability, using exosomes. Exosomes (Exo) are promising non-toxic and biocompatible drug delivery vehicles Our project aims are to address the research gap by formulating exosomal cannabidiol (ExoCBD): a tumor-targeted oral delivery system for the treatment of breast cancer. The targeting approach relies on the overexpression of folate receptors at the tumor site by using folic acid functionalized exosomes (FA-Exo). …
Electrochemical Modulation Of Surface Plasmon Wave To Investigate Dna-Based Sensing Platforms And Detection Of Sars-Cov2., Anil Sharma
Electronic Theses and Dissertations
This study offers a thorough comparative analysis of optical and electrical signaling strategies for assessing the electrochemical properties of different redox-labeled DNA-based biosensing platforms. In addition, it illustrates the development of an optical interrogation technique with electrochemical modulation of surface plasmon waves (ECM-SPW) as a route for analyzing and implementing DNA-based hybridization sensors. For those quantitative analyses, we chose a model sensing platform composed of a methylene blue (MB)-modified single-stranded DNA (ssDNA) signaling probe and an unlabeled capture ssDNA probe that complements the signaling probe. Two types of signaling probes were employed in this work: one with MB attached to …
The Impact Of Pegylation On Cellular Uptake And In Vivo Biodistribution Of Gold Nanoparticle Mri Contrast Agents., Nagwa El-Baz
The Impact Of Pegylation On Cellular Uptake And In Vivo Biodistribution Of Gold Nanoparticle Mri Contrast Agents., Nagwa El-Baz
Electronic Theses and Dissertations
Gold nanoparticles (GNPs) have become a pivotal platform for the delivery of pharmaceutical and diagnostic agents as well as for general therapeutic purposes. Despite their potential for use in biomedicine, their interaction with serum proteins is crucial as it could change their biological profile due to the formation of a protein corona, which can affect their delivery to target tissues in the body. Grafting the GNPs with polyethylene glycol (PEG) is widely used in research to decrease opsonization of the particles by serum proteins and decrease the uptake by the reticuloendothelial system. Here in this dissertation, we have developed a …
Quality By Design Based Optimization Of Anti-Inflammatory Nanoemulgels For Local Treatment Of Burn Wounds, Leah Dickey
Quality By Design Based Optimization Of Anti-Inflammatory Nanoemulgels For Local Treatment Of Burn Wounds, Leah Dickey
Electronic Theses and Dissertations
Burns are some of the most traumatizing and damaging skin injuries, with the potential of causing extensive internal damage that increases the risk of chronic wound development. Oral and topical analgesics in combination with antibiotics can provide temporary relief and improve wound healing progress for both mild and severe burns. However, recurrent systemic exposure to pain relievers and antibiotics has been associated with adverse side effects including nausea, drowsiness, abdominal pain, etc., and increased risk of new infections or even ulcers. Local and targeted drug delivery systems, such as nanomedicine, have gained attention as potentially more effective alternatives to improve …
Machine Learning Applied To Colloidal Properties Of Perfluorocarbon Nanoemulsions For Imaging In Ards/Ali, Marco Hosfeld
Machine Learning Applied To Colloidal Properties Of Perfluorocarbon Nanoemulsions For Imaging In Ards/Ali, Marco Hosfeld
Electronic Theses and Dissertations
Acute Respiratory distress Syndrome (ARDS) and Acute Lung Injury (ALI) are inflammatory lung pathologies consisting of non-hydrostatic pulmonary edema leading to hypoxia and impaired gas exchange in the lungs. ARDS/ALI is both difficult to study and treat as it is not in itself a specific pathology but rather a syndrome consisting of many pathologies that vary case by case. It is, however, consistently characterized by an explosive acute inflammatory response in the lung parenchyma leading to hypoxia. Although time has seen to an increase in the understanding of ARDS/ALI, the mortality rate remains in the range of 30-50%. For these …
Electrospun Fibers And Nanoparticles For The Prevention Of Sexually Transmitted Infections., Kevin Michael Tyo
Electrospun Fibers And Nanoparticles For The Prevention Of Sexually Transmitted Infections., Kevin Michael Tyo
Electronic Theses and Dissertations
Human immunodeficiency virus-1 (HIV-1) and herpes simplex virus 2 (HSV-2) affect hundreds of millions of people worldwide, with women disproportionately impacted by these infections. Currently, only oral pre-exposure prophylaxis (PrEP) is approved specifically for the prevention of HIV-1, but is challenged with adverse side effects associated with long-term use. Topical delivery platforms, such as gels and films, deliver agents directly to the female reproductive tract, but are limited in providing transient-release. The technology of polymeric electrospun fibers may serve as alternative topical delivery platform to the female reproductive tract. In these studies, we fabricated electrospun fibers comprised of different polymers …
Development Of Bar-Peptide Nanoparticles And Electrospun Fibers For The Prevention And Treatment Of Oral Biofilms., Mohamed Yehia Mahmoud
Development Of Bar-Peptide Nanoparticles And Electrospun Fibers For The Prevention And Treatment Of Oral Biofilms., Mohamed Yehia Mahmoud
Electronic Theses and Dissertations
Background: Periodontal diseases are globally prevalent inflammatory disorders that affect ~47% of U.S adults. Porphyromonas gingivalis (Pg) has been identified as a “keystone” pathogen that disrupts host-microbe homeostasis and contributes to the initiation and progression of periodontitis. Pg associates with oral streptococci in supragingival plaque and this interaction represents a potential target for therapeutic intervention. Previously our group developed a peptide (designated BAR), that potently inhibits Pg/Streptococcus gordonii (Sg) adherence in vitro and Pg virulence in a murine model of periodontitis. While efficacious, BAR (SspB Adherence Region) provided transient inhibition and required higher concentrations of BAR to disrupt established …
Fabrication Of Polyelectrolyte Nanoparticles Through Hydrophobic Interaction, Ruginn Porce Catarata
Fabrication Of Polyelectrolyte Nanoparticles Through Hydrophobic Interaction, Ruginn Porce Catarata
Electronic Theses and Dissertations
Anticancer drugs like gemcitabine (GEM) are used to treat cancers such as, pancreatic ductal adenocarcinoma (PDAC). However, the use of free gemcitabine yields challenges including cytotoxicity to healthy cells and poor circulation time. By encapsulating GEM in nanoparticles these challenges can be overcome. In this study poly(acrylic acid) (PAA)-GEM nanoparticles are fabricated by coupling GEM onto PAA. The particle formation is driven by the hydrophobic interaction of GEM, which collects in the core of the nanoparticle, forming a PAA shell. The nanoparticles were optimized by studying the PAA/GEM ratio and pH during fabrication. Characteristics of the nanoparticles including size, morphology …
Development Of 3d Printed And 3d Metal-Based Micro/Nanofabricated, And Nano-Functionalized, Microelectrode Array (Mea) Biosensors For Flexible, Conformable, And In Vitro Applications, Charles Didier
Electronic Theses and Dissertations
Emerging fields such as "Organs on a Chip", disease modeling in vitro, stem cell manufacturing and wearable bioelectronics are demanding rapid development of 3D Microelectrode Arrays (MEAs) for electrical interfacing with biological constructs. The work reported in this thesis focuses on two developmental tracks: "Dynamic 3D MEAs" and metal microfabrication for 3D MEAs. In the first part of the thesis, we explore the capabilities and limitations of 3D printed microserpentines (µserpentines) and utilize these structures to develop dynamic 3D microelectrodes. Analytical modeling of µserpentines flexibility followed by integration into a flexible Kapton® package and PDMS insulation are demonstrated. These 3D …
Nutritional Transporter Mediated Drug Delivery For Cancer, Siddharth S. Kesharwani
Nutritional Transporter Mediated Drug Delivery For Cancer, Siddharth S. Kesharwani
Electronic Theses and Dissertations
Recent advancements in nanotechnology have unfolded novel opportunities in medicine, especially in targeted therapeutics and imaging for cancer. However, the majority of the existing nanotechnologies for cancer suffer from shortcomings such as (i) rapid elimination from the systemic circulation before reaching the cancer tissue. (ii) poor tumor accumulation, targeting, and penetration due to inadequate vasculature and extensive extracellular matrix in the tumor. Thus, overcoming these two limitations of nanotechnology is of considerable interests for cancer researchers. In this dissertation, we demonstrate the feasibility of glucose-modified nanoparticles (GLU-NPs) as an efficient cancer targeted-delivery system for enhancing the systemic circulation time and …
Synthesis And Characterization Of Targeted Bar Encapsulated Polylactic-Co-Glycolic Acid Nanoparticles To Inhibit Porphyromonas Gingivalis Biofilm Formation., Ranjith Radha Krishnan
Synthesis And Characterization Of Targeted Bar Encapsulated Polylactic-Co-Glycolic Acid Nanoparticles To Inhibit Porphyromonas Gingivalis Biofilm Formation., Ranjith Radha Krishnan
Electronic Theses and Dissertations
Periodontal disease is one of the most prevalent infectious diseases worldwide. Between 30-50% of the global adult population suffers from periodontal disease. Some form of periodontitis is present in 46% of American adults, corresponding to annual expenditures in excess of 14 billion dollars for treatment and prevention. Current treatments for periodontal diseases involve mechanical removal of plaque, correction of risk factors, gingival surgery and/or antibiotic therapy. To our knowledge there is no effective therapeutic approach that aims to limit pathogen colonization of the oral biofilm or re-colonization after treatment. Interaction of the pathogen Porphyromonas gingivalis with oral streptococci is critical …
A Cancer-Targeted Gold Nanoparticle-Based Mri Contrast Agent., Nagwa El-Baz
A Cancer-Targeted Gold Nanoparticle-Based Mri Contrast Agent., Nagwa El-Baz
Electronic Theses and Dissertations
In oncology, imaging plays a major role in terms of early detection and treatment of most types of cancer. Magnetic resonance imaging (MRI) is mostly used for cancer diagnosis due to its excellent contrast resolution. However, MRI for cancer diagnosis is somewhat limited by its sensitivity. In this thesis, we assessed the ability of theranostic platform consisting of gold nanoparticles functionalized with a cancer targeting aptamer; AS1411 and gadolinium chelate (Dotarem thiol derivative; Gd (III)-DO3A) as a MRI contrast agent to target malignant tumors by enhancing the MRI contrast of the detected tumor. The proposed technology is a novel injectable …
Evaluation Of Drug-Loaded Gold Nanoparticle Cytotoxicity As A Function Of Tumor Tissue Heterogeneity., Hunter Allan Miller
Evaluation Of Drug-Loaded Gold Nanoparticle Cytotoxicity As A Function Of Tumor Tissue Heterogeneity., Hunter Allan Miller
Electronic Theses and Dissertations
The inherent heterogeneity of tumor tissue presents a major challenge to nanoparticle-medicated drug delivery. This heterogeneity spans from the molecular to the cellular (cell types) and to the tissue (vasculature, extra-cellular matrix) scales. Here we employ computational modeling to evaluate therapeutic response as a function of vascular-induced tumor tissue heterogeneity. Using data with three-layered gold nanoparticles loaded with cisplatin, nanotherapy is simulated with different levels of tissue heterogeneity, and the treatment response is measured in terms of tumor regression. The results show that tumor vascular density non-trivially influences the nanoparticle uptake and washout, and the associated tissue response. The drug …
Mechanism Of Interaction Of Peptide Modified Nanoparticles With Porphyromonas Gingivalis., Ankita Jain
Mechanism Of Interaction Of Peptide Modified Nanoparticles With Porphyromonas Gingivalis., Ankita Jain
Electronic Theses and Dissertations
Studies suggest that P. gingivalis functions as a keystone pathogen and interacts with primary colonizers in the supragingival biofilm such as S. gordonii. This interaction contributes to the initial colonization of the oral cavity by P. gingivalis and thus represents a potential target for therapeutic intervention. We have identified a peptide (BAR) derived from the streptococcal SspB protein that functions to inhibit P. gingivalis adherence to S. gordonii. In addition, we showed that nanoparticles (NPs) functionalized with BAR inhibit this interaction more potently than free soluble peptide, possibly by promoting interaction with P. gingivalis at higher valency than …
An Investigation Into Formulation And Therapeutic Effectiveness Of Nanoparticle Drug Delivery For Select Pharmaceutical Agents, Dustin Cooper
An Investigation Into Formulation And Therapeutic Effectiveness Of Nanoparticle Drug Delivery For Select Pharmaceutical Agents, Dustin Cooper
Electronic Theses and Dissertations
Drug based nanoparticle (NP) formulations have gained considerable attention over the past decade for their use in various drug delivery systems. NPs have been shown to increase bioavailability, decrease side effects of highly toxic drugs, and prolong drug release. Furthermore, polymer based, biodegradable nanodelivery has become increasing popular in the field of NP formulation because of their high degree of compatibility and low rate of toxicity. Due to their popularity, commercially available polymers such as poly lactic acid (PLA), poly glycolic acid (PGA) and polylactic-co-glycolic acid (PLGA) are commonly used in the development and design of new nano based delivery …
Multi-Scale Nanoindentation For Characterization Of Oil Shales, Zachary N. Miller
Multi-Scale Nanoindentation For Characterization Of Oil Shales, Zachary N. Miller
Electronic Theses and Dissertations
Studies of the effects of polishing techniques, scale of nanoindentation, and petrophysical properties were conducted on both Woodford and Tuscaloosa Marine Shale. Polishing procedures include both an in-house developed, mechanical sample preparation protocol as well as ion beam milling. The elastic modulus and hardness of each mechanically polished sample was found to have larger value than those that were ion-milled. Additionally, at low loads, the samples resulted in having high standard deviation. This high deviation was found to be significantly reduced by testing at higher loads. The variations in results between mechanically polished and ion beam milled samples is believed …
Synthesis And Functional Evaluation Of Peptide Modified Poly (Lactic-Co-Glycolic Acid) Nanoparticles To Inhibit Porphyromonas Gingivalis Biofilm Formation., Paridhi Kalia
Electronic Theses and Dissertations
Periodontal disease is an oral inflammatory disorder that afflicts roughly 46% of the adults in the U.S. Currently, treatment of periodontal disease involves the removal of plaque from the gingival pocket (with possible antibiotic treatment) and if necessary, gingival surgery. To our knowledge, no therapeutic approach exists that promotes host-biofilm homeostasis by limiting pathogen recolonization of the oral cavity after prophylaxis or treatment. The interaction of the pathogen Porphyromonas gingivalis with commensal streptococci is critical for initiation of periodontitis and represents a target for limiting P. gingivalis colonization of the oral cavity. Previous studies showed that a synthetic peptide …