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  • Author:
    Jun Ren
    Advisory Committee:
    Lei Liu
    Degree Area:
    Electrical Engineering
    Degree:
    Doctor of Philosophy
  • Author:
    Yide Zhang
    Advisory Committee:
    Scott S. Howard, Thomas O'Sullivan, Alan Seabaugh, Cody Smith
    Degree Area:
    Electrical Engineering
    Degree:
    Doctor of Philosophy
    Defense Date:
    2019-08-06
  • Author:
    Homayoon Hatami
    Advisory Committee:
    Daniel J. Costello Jr., Thomsa E. Fuja, David G. M. Mitchell, J. Nicholas Laneman, Roxana Smarandache
    Degree Area:
    Electrical Engineering
    Degree:
    Doctor of Philosophy
    Defense Date:
    2019-05-30
  • Author(s):
    Yide Zhang
    Abstract:

    Multiphoton microscopy combined with fluorescence lifetime imaging microscopy (MPM-FLIM) is a technique that allows for imaging the lifetime of fluorescence created by two-photon excitation. It not only possesses the advantages of MPM such as large imaging depth, but also the strengths of FLIM including the ability to discriminate different fluorophores with similar emission spectra. In FLIM, the frequency-domain (FD) method, which relies on periodic intensity-modulated excitation light and i…

    Date Created:
    2015-10-22
    Resource Type
    Presentation
  • Author(s):
    Yide Zhang
    Abstract:

    In cancer and all biomedical researches, we always need a microscope with better imaging precision, speed, functionality, and depth, so that the diagnostics and treatments of cancer and other diseases can be accurate, fast, and noninvasive. However, conventional fluorescence microscopes cannot satisfy these needs due to physical limits on resolution, speed, information, and depth. In this work, we aim to overcome these limits using novel super-resolution microscopy and high-speed quantitative…

    Date Created:
    2018-04-09
    Resource Type
    Presentation
  • Author(s):
    Yide Zhang
    Abstract:

    Multiphoton microscopy (MPM) is a widely used in vivo imaging technique in biological and medical applications. In the case of two-photon excitation fluorescence, two lower-energy photons excite a fluorophore which in turn emits a single higher-energy photon, whose rate depends quadratically on the excitation intensity, thus enabling higher resolution with narrower point spread function (PSF) than conventional one-photon fluorescence microscopy. Fluorescence lifetime imaging microscopy (FLIM)…

    Date Created:
    2016-04-04
    Resource Type
    Presentation
  • Author(s):
    Yide Zhang
    Abstract:

    To fundamentally understand biological and medical phenomena such as aging and diseases, we need the information of the microenvironment surrounding living cells. We propose the multiphoton fluorescence lifetime imaging microscopy (MPM-FLIM) platform with super-sensitivity and super-resolution capabilities to quantitatively obtain this information at the intracellular level. First, we present a simple MPM oxygen imaging probe compatible with aqueous biological media based on water-soluble rut…

    Date Created:
    2017-03-30
    Resource Type
    Presentation
  • Author(s):
    Yide Zhang
    Abstract:

    Super-resolution fluorescence microscopy is an important tool in biomedical research for its ability to discern features smaller than the diffraction limit, but its universal application is not feasible due to its difficult implementation and high cost. In this research, we propose and demonstrate a new kind of super-resolution fluorescence microscopy that can be easily implemented and requires neither additional hardware nor complex post-processing. The microscopy is based on the principle o…

    Date Created:
    2017-10-19
    Resource Type
    Presentation
  • Author:
    Michael S. McConnell
    Advisory Committee:
    Gregory L. Snider, Alexei O. Orlov, Jonathan Chisum, Patrick Fay, Craig Leng
    Degree Area:
    Electrical Engineering
    Degree:
    Doctor of Philosophy
    Defense Date:
    2018-12-10
  • Author(s):
    Genevieve D. Vigil, Lina Cao, Aamir A. Khan, David Benirschke, Tahsin Ahmed, Patrick Fay, Scott S. Howard
    Abstract:

    Fluorophore saturation is the key factor limiting the speed and excitation range of fluorescence lifetime imaging microscopy (FLIM). For example, fluorophore saturation causes incorrect lifetime measurements when using conventional frequency-domain FLIM at high excitation powers. In this Letter, we present an analytical theoretical description of this error and present a method for compensating for this error in order to extract correct lifetime measurements in the limit of fluorophore satura…

    Date Published:
    2016-12
  • Author(s):
    Yide Zhang, Prakash Nallathamby, Genevieve D. Vigil, Aamir A. Khan, Devon E. Mason, Joel D. Boerckel, Ryan K. Roeder, Scott S. Howard
    Abstract:

    Super-resolution fluorescence microscopy is an important tool in biomedical research for its ability to discern features smaller than the diffraction limit. However, due to its difficult implementation and high cost, the super-resolution microscopy is not feasible in many applications. In this paper, we propose and demonstrate a saturation-based super-resolution fluorescence microscopy technique that can be easily implemented and requires neither additional hardware nor complex post-processin…

    Date Published:
    2018-04
  • Author(s):
    Devon E. Mason, James H. Dawahare, Daniel J. Horan, Genevieve D. Vigil, Scott S. Howard,, Alexander G. Robling, , Teresita M. Bellido, Joel D. Boerckel
    Abstract:

    The functions of the paralogous transcriptional coactivators Yes-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ) in bone are controversial. Each has been observed to promote or inhibit osteogenesis in vitro, with reports of both equivalent and divergent functions. Their combinatorial roles in bone physiology are unknown. We report that combinatorial YAP/TAZ deletion from skeletal lineage cells, using Osterix-Cre, caused an osteogenesis imperfecta-like phe…

    Date Published:
    2018-05