Browsing Physics by Title
Now showing items 40-59 of 70
-
Laser tweezers and Raman spectroscopy systems and methods for the study of microscopic particles
(2005-05-24)Methods and systems for studying microscopic particles are provided. An optical trap for a selected microscopic particle can be formed with a laser beam at a first power level. The laser beam can have a variable power level ... -
Levels of Ca2+-Dipicolinic Acid in Individual Bacillus Spores Determined Using Microfluidic Raman Tweezers
(East Carolina University, 2007-07)Pyridine-2,6-dicarboxylic acid (dipicolinic acid [DPA]) in a 1:1 chelate with calcium ion (Ca-DPA) comprises 5 to 15% of the dry weight of spores of Bacillus species. Ca-DPA is important in spore resistance to many ... -
Localization of soniferous fish using a sparse hydrophone array and conventional steered response power method
(East Carolina University, 2019-12-10)A sparse seven-channel hydrophone array was deployed in intertidal marsh creeks located within the North-Inlet-Winyah-Bay Nature Reserve at Baruch Marine Field Laboratory in Hobcaw Barony, Georgetown, South Carolina, USA. ... -
Mathematical Modeling of Oxygen Transport, Cell Killing and Cell Decision Making in Photodynamic Therapy of Cancer
(East Carolina University, 2012)In this study we present a model of in vitro cell killing through type II Photodynamic Therapy (PDT) for simulation of the molecular interactions leading to cell death in time domain in the presence of oxygen transport ... -
Memory of Germinant Stimuli in Bacterial Spores
(2015-11)Bacterial spores, despite being metabolically dormant, possess the remarkable capacity to detect nutrients and other molecules in their environment through a biochemical sensory apparatus that can trigger spore germination, ... -
Methods and systems for optically characterizing a turbid material using a structured incident beam
(2010-04-08)Methods and systems for optically characterizing a turbid sample are provided. A structured light beam is impinged on the sample. The sample includes an embedded region. A reflected light image of the structured light beam ... -
MODIFICATION OF CELL SURVIVAL RATES BY CERIUM OXIDE NANOPARTICLES FOR EXPOSURE TO PROTON RADIATION
(East Carolina University, 2017-05-03)Radiation therapy is a well-established and widely used treatment for a variety of malignancies in the human body. Current radiotherapy methods most frequently use x-rays to deliver a lethal dose to tumors with sufficient ... -
Multi-wavelength beam splitting systems for simultaneous imaging of a distant object in two or more spectral channels using a single camera
(2016-09-29)An optical imaging system and related methods are provided that acquire images of an object at a distance in different spectral regions using only one camera. The systems and methods are adaptable to applications where ... -
Mutation of tandem repeats in fibrin's alpha-C region
(East Carolina University, 2018-01-19)Cardiovascular problems such as myocardial infarctions and emboli are the number one killers in the United States. These health concerns arise from blood clotting unnecessarily in the veins or arteries. Studies have shown ... -
A new assessment model for tumor heterogeneity analysis with [18]F-FDG PET images
(2016-01)It has been shown that the intratumor heterogeneity can be characterized with quantitative analysis of the [18]F-FDG PET image data. The existing models employ multiple parameters for feature extraction which makes it ... -
Optical and dielectric properties of metallic calcium, modeled generalized oscillator strength function of calcium, interaction cross sections of electrons, protons, and alpha particles with calcium
(East Carolina University, 2013)An analysis of the optical and the dielectric properties of calcium, determined from the literature, was performed. The optical functions of calcium were used for a calculation of the energy loss function of calcium. The ... -
Optical Pulling, Optical Deflection, and Optical Trapping of Single Airborne Particles using Negative Photophoresis
(East Carolina University, 2016-05-03)Optical manipulation is the use of light to control the motion of objects. This thesis focuses on the development of optical transportation technology via optical pulling with application to the characterization of single ... -
Optimizing graphene oxide reduction via laser irradiation
(East Carolina University, 2017-01-04)The present report discusses a single step method to reduce graphene oxide via laser irradiation. A computer numerically controlled laser engraver equipped with a 450nm laser diode was engineered to conduct this research. ... -
Particle motion and sound propagation near boundaries
(2019-07-09)It has been well-established that the inner ears of fishes act as particle motion detectors (Popper and Hawkins, 2018) and that fishes use particle motion to determine the direction of a sound source (Hawkins and Popper, ... -
Perturbation of Circadian Neuronal Oscillators with Low-Intensity Magnetic Stimulation
(East Carolina University, 2019-04-23)Circadian neuronal oscillatory dynamics are perturbed substantially in numerous neuropsychiatric diseases, such as Alzheimer's, Parkinson's, and depression. Moreover, desynchronization of neuronal oscillators complicates ... -
PROFILING EFFUSION CELLS BY QUANTITATIVE ANALYSIS OF MORPHOLOGY AND DIFFRACTION IMAGING PATTERNS
(East Carolina University, 2019-04-12)Profiling cells in human pleural and peritoneal effusion (PPE) samples is an essential task for cytological diagnosis of cancers and patient management. Conventional PPE cytology of a PPE sample is labor intensive and its ... -
A PROPOSED METHODOLOGY TO ASSESS HDR [superscript]192Ir RADIAL DOSE WITH FRICKE DOSIMETRY
(East Carolina University, 2011)The radial absorbed dose to water, D(r,theta), a quantity not yet directly measured with primary standards, was assessed with the Fricke solution which has been considered as an absolute aqueous solution to perform dosimetry. ... -
Protection and Sensitization of Human Cells to Proton Radiation by Cerium Oxide Nanoparticles
(East Carolina University, 2017-07-17)In radiation therapy for the treatment of cancer, there is demand for novel approaches that will improve tumor cell killing while protecting healthy tissue. One such approach that has shown considerable promise is the ... -
Quantifying Double-Strand Breaks and Clustered Damages in DNA by Single-Molecule Laser Fluorescence Sizing
(East Carolina University, 2003-02)Fluorescence from a single DNA molecule passing through a laser beam is proportional to the size (contour length) of the molecule, and molecules of different sizes can be counted with equal efficiencies. Single-molecule ... -
Quantitative analysis and comparison of 3D morphology between viable and apoptotic MCF-7 breast cancer cells and characterization of nuclear fragmentation
(2017-09-08)Morphological changes in apoptotic cells provide essential markers for defining and detection of apoptosis as a fundamental mechanism of cell death. Among these changes, the nuclear fragmentation and condensation have ...