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.
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Showing 1 to 20 of 100 for “"optical density"”.
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Impact of macular pigment optical density on photophobia threshold
… relationship between integrated macular pigment optical density (MPOD) and PP thresholds for short-wavelength targets relative to mid- to long-wavelength targets; and second, to measure changes in PP thresholds after increasing MP with lutein supplements.</p><p>MPOD was measured psychophysically …
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Macular pigment optical density and academic achievement among preadolescent children
… antioxidant properties. Both macular pigment optical density (MPOD) – a non-invasive measure of retinal lutein and correlate of brain lutein – and dietary lutein supplementation have been associated with better cognitive function among adult populations. However, the reliability of …
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Investigating determinants of macular pigment optical density and macular pigment distribution in adults aged 45--73: Can enhanced analytical techniques improve the ability to predict macular pigment status?
… sex, and biochemical factors to macular pigment optical density (MPOD) and macular pigment (MP) distribution in 108 adults. Dietary assessment tools were evaluated for their ability to predict MP status. Macular pigment was assessed at four foveal sites and one parafoveal site. An average …
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Comparison of optical density, total cell protein, and number of viable cells (via fluorescent straining) as measures of microbial growth kinetics in suspended and biofilm cultures during biodegradation of naphthalene
… biomass measurements using either dry weight or optical density (OD), without distinguishing live from dead bacteria or debris. As a result, there remains considerable uncertainty in reliably predicting rates of biodegradation for design of treatment processes for environmental pollutants. This …
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Point-based Ionizing Radiation Dosimetry Using Radiochromic Materials and a Fibreoptic Readout System
… were able to produce a real-time measurement of optical density from a small volume, allowing positioning onto a tip of an optical fibre in the future. The increase in optical density was linear with absorbed dose for MD-55, and non-linear for EBT. The non-linearity of EBT is associated with its …
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Application of Optical CT to Estimate the Mass of Macroalgae in a Tank of Water
… a mass estimation system for macroalgae using optical computed tomography. The system consists of a table with a fixed camera and backlighting, which rotates around a container of macroalgae to collect images from various points. The images capture the translucency along various light paths …
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Caracterização do efeito whitening em polifluoreto de vinilideno (PVDF) por ensaio ultrassônico
… / S) and dentreded fluctutation analysis (DFA). Optical density measurements were performed to confirm and quantify the whitening effect on PVDF samples. Conventional techniques such as density measured by the Archimedes method was used as a comparative factor for the non-destructive techniques. …
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Molecular quantification in digital health diagnostic cd with surface modifications
… dropped onto the strip the resulting change in optical density is proportional to glucose concentration. Using the laser light, optical pickup and the error detection and correction protocol present in all CD drives, this change in optical density and hence the concentration of glucose in the …
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Industry 4.0 in Biomanufacturing: Predictive Real-Time Models Using Process Analytical Technology
… In this thesis, we collect capacitance and optical density data from two in-line sensors in production bioreactors to compute real-time readings of viable cell density (VCD) and viability, two critical metrics that drive product quality and batch yield. Comparing predictions with manually …
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Ion dosimetry for radiobiology experiments employing laser-accelerated beams
… of which is crucial to the development of an all-optical delivery of ion beams suitable for cancer treatment. In conducting cell experiments to investigate this behaviour, accurate dosimetry is key to an in-depth understanding of the cell reaction to dose deposited via various particle types and …
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The inhibition of germination and growth of Clostridium botulinum 62A by BHA, BHT, TBHQ and 8-Hydroxyquinoline
… acid and NaHC0₃. Cell growth was monitored by optical density (600 nm) increase and germination was monitored either by optical density (600 nm) decrease or by increase in percent phase dark spores viewed under phase contrast microscopy. Strict anaerobic conditions were maintained throughout …
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Characterization of The New Xoft Axxent Electronic Brachytherapy Source Using Presage(Tm)
… leuco dye which produces a linear change in optical density when exposed to radiation. This optical density change is imaged using an optical-CT scanner and reconstructed for analysis using MATLAB software. A Xoft source with a measured air kerma strength of 126095 U was used in this …
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Synthesis and Characterization of CdSe/ZnS Core/Shell Quantum Dot Sensitized PCPDTBT-P3HT:PCBM Organic Photovoltaics
… this thin film system exhibits only 0.43 optical density at 500 nm. To improve the performance of this polymer blend photovoltaic, we aim to increase absorption by adding CdSe(ZnS) core (shell) quantum dots. Four groups of devices are fabricated: a control group with an active polymer …
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Host-parasite interactions of barley yellow dwarf virus and oats: Physiological and immunological studies
… caused aggravated symptoms and increased optical density in polyclonal ELISA of uninoculated plants. Cross absorption of enzyme conjugated polyclonal antibody using sap of senescing uninoculated oats reduced optical density to about one-half the amount with young plant sap for cross …
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Variability of chromatic sensitivity: fundamental studies and clinical applications
… colour vision tests.The macular pigment (MP) optical density was also measured in 23 subjects selected for their higher than normal levels of pigment as a result of their participation in a carotenoid supplementation trial. This pre-receptoral filter absorbs light preferentially in the short …
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Measuring and modeling the effects of temperature on the amphibian chytrid fungus and assessing amphibian skin bacterial communities
… with this added complexity when only optical density data are available to quantify growth, highlighting the need to match the appropriate data to the complexity of the model. In Chapter 5, I created a mechanistic model that was parameterized by a combination of optical density, MTT …
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A charge coupled device based optical tomographic instrumentation system for particle sizing.
… (abbreviated as CCD) linear image sensors in an optical tomographic instrumentation system used for sizing particles. Four CCD linear image sensors are configured around an octagonal shaped flow pipe for a four projections system. The measurement system is explained and uses four CCD linear image …
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Survival of Listeria monocytogenes on Blueberries (Vaccinium corymbosum) and Shelf Life Determination under Controlled Atmosphere Storage
… at 25 deg C for 24h, was calculated measuring optical density. Complete inhibition occurred in the presence of treatments including malic acid pH 2.0 and pH 3.0; lactic acid pH 2.0, pH 3.0 and pH 4.0; and with blueberry extract pH 2.0 in the mixture. After 6h, there were significant differences …
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Avaliação do potencial biotecnológico de bactérias láticas para produção de biomulsificantes, bacteriocinas e lipase
… of glycerol concentration and initial pH on optical density at 600 nm (DO600 nm) and emulsification index after 24h (IE24%). Culture supernatants from L. paracasei were evaluated for antimicrobial activity (against Staphylococcus aureus ATCC 6538, Escherichia coli ATCC 8739, Burkholderia …
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Validation of a Two-Dimensional Clinostat Design to Provide Functional Weightlessness to Custom Gas Exchange Vessels
… specifically, biological validation consisted of optical density, biofilm analysis and gene regulation. Additionally, prototype vessels were created to utilize aerobic bacteria on future clinostat experiments.</p>
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