Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 17 of 17 for “"Photosensitization"”.
-
Chemical aspects of some ovine hepatogenous photosensitization diseases
… aetiology of saponin-associated hepatogenous photosensitization diseases of ruminants (sheep, cattle, goats and deer), the distribution of saponins in causative plants (Agave lecheguilla, Brachiaria decumbens, Narthecium ossifragum, Nolina texana, Tribulus terrestris and some Panicum species), …
-
Chemical aspects of saponin bioactivity and ovine photosensitization diseases
… aspects of saponin-associated hepatogenous photosensitization of ruminants (sheep, goats, and cattle) is presented. A field trial was undertaken to explore the genin dose/response hypothesis that saponins produced by the plant Narthecium ossifragum may be the direct cause of the toxicity …
-
High Pressure Studies of Triphenylmethane Dye Molecules (Photosensitization, Adsorption, Isomerism, Semiconductors, Surfaces)
High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the …
-
Semiconductor nanocrystals for novel optical applications
… class of materials. Here, we report on the photosensitization of photorefractive polymeric composites at visible wavelengths through the inclusion of narrow band-gap semiconductor nanocrystals composed of PbS. Through this approach, internal diffraction efficiencies in excess of 82%, …
-
Singlet Oxygen Production and Its Kinetics in Nanoparticle-Photosensitizer Hybrid Systems
… production and advance the practical uses of photosensitization. Nevertheless, when compared to conventional chemotherapy as a means to treat diseases, or the use of common chemical agents to inhibit bacterial growth, application of nanomaterials for photodynamic processes in these areas is …
-
Photophysics of Organic Probes and their Applications in Bioimaging & Photodynamic Therapy
… In vitro photodynamic studies demonstrated that photosensitization of the agent can induce cellular damage, subsequently leading to cell death by a necrotic cell death mechanism, supporting the therapeutic potential of using the agent for photodynamic therapy.
-
A Model for the Chloroplast: A Study of the Photochemical and Spectral Properties of Pheophytin A Adsorbed to the Surface of Small Particles
… polystyrene particles, the quantum yield of photosensitization is the same as that with the pigment in 90% methanol solution, within a factor of three. The quantum yield falls to 1/2 this maximum value only at 0.4 coverage. In this region the absorption spectra are broadened toward longer …
-
Oxytetracycline Induced Photosensitivity in Channel Catfish (Ictalurus punctatus)
Photosensitivity following injection with oxytetracycline was evaluated in channel catfish. In a controlled experiment, only oxytetracycline-injected fish that were exposed to direct sunlight exhibited necrotic ocular and dorsolateral epidermal lesions. All of the affected fish died within 8 d. All …
-
Naujo tetrakatijoninio porfirino sukeltos Escherichia coli fotopažaidos /
The development of multidrug resistance and its spreading among the pathogens, increased the demand for alternative treatment methods of bacterial infections. One of the most promising techniques is photodynamic antibacterial chemotherapy. The main idea of it lays in combining three initially …
-
Mechanisms of Microbial Formation and Photodegradation of Methylmercury in the Aquatic Environment
… suggested that singlet oxygen generated from photosensitization of DOM drove the photodecomposition of methylmercury. The rate of methylmercury degradation depended on the type of methylmercury (CH3Hg+) binding ligand present in the water. CH3Hg -thiol (e.g., glutathione, mercaptoacetate, DOM) …
-
Reazioni fotoindotte da agenti xenobiotici in sistemi a crescente complessità molecolare
Molte biomolecole si modificano in presenza di fotosensibilizzatori. Alcuni framaci, infatti, possono comportarsi da fotosensbilizzatori endogeni determinando alterazioni a livello delle proteine che possono essere coinvolte nella manifestazione di fotoallergie e altri effetti indesiderati indotti …
-
Porphyrin chemistry pertaining to the design of anticancer agents
… under hypoxic conditions, and have not shown photosensitization toward HT-29 cells at wavelengths of 630 ± 10 run, although some weak effects are found. More biological studies (e.g., tumor accumulation studies in vivo) are needed before final evaluations of these drugs are made. Potential …
-
Investigation into the potential of methylene blue and its derivatives to be used in the photodynamic therapy of non-pigmented and pigmented cells
… persistence in the skin commonly causes severe photosensitization reactions in patients for up to three months post-treatment. Photofrin® also has poor light absorption properties within the therapeutic window (600 to 800 nm) for PDT. Furthermore, PDT with Photofrin® has proved of no use in the …
-
The testing of semiconductor-based adsorption modified photosensitive sensors for their response to a volatile organic compound, oxygen, humidity, and heating
Two thin-film sensors, composed of different thicknesses (approximately 0.5 microns and 4.5 microns) of a cadmium sulfide layer coated with Rhodamine B fluorescent dye on a glass substrate, were tested for change in photoconductivity due to exposure to different concentrations of gaseous organic …
-
Mechanistic, Biochemical, and Theoretical Studies of Phototoxicity and Photobluing
<p>This thesis consists of four chapters as detailed below:</p> <p>Chapter 1 discusses the photoconversion of heptamethine to pentamethine cyanines and of pentamethine to trimethine cyanines. Here, we report mechanistic studies and initial experimental evidence for a previously unexplored 4-carbon …