Now showing items 1-5 of 5

    • (15)N Hyperpolarization of Imidazole-(15)N2 for Magnetic Resonance pH Sensing via SABRE-SHEATH. 

      Shchepin, Roman V; Barskiy, Danila A; Coffey, Aaron M; Theis, Thomas; Shi, Fan; Warren, Warren S; Goodson, Boyd M; ... (8 authors) (ACS Sens, 2016-06-24)
      (15)N nuclear spins of imidazole-(15)N2 were hyperpolarized using NMR signal amplification by reversible exchange in shield enables alignment transfer to heteronuclei (SABRE-SHEATH). A (15)N NMR signal enhancement of ∼2000-fold ...
    • In vivo and ex vivo epi-mode pump-probe imaging of melanin and microvasculature. 

      Matthews, Thomas E; Wilson, Jesse W; Degan, Simone; Simpson, Mary Jane; Jin, Jane Y; Zhang, Jennifer Y; Warren, Warren S (Biomed Opt Express, 2011-06-01)
      We performed epi-mode pump-probe imaging of melanin in excised human pigmented lesions and both hemoglobin and melanin in live xenograft mouse melanoma models to depths greater than 100 µm. Eumelanin and pheomelanin images, ...
    • Measurements of nonlinear refractive index in scattering media. 

      Samineni, Prathyush; Perret, Zachary; Warren, Warren S; Fischer, Martin C (Opt Express, 2010-06-07)
      We have recently developed a spectral re-shaping technique to simultaneously measure nonlinear refractive index and nonlinear absorption. In this technique, the information about the nonlinearities is encoded in the frequency ...
    • Optimized, unequal pulse spacing in multiple echo sequences improves refocusing in magnetic resonance. 

      Jenista, Elizabeth R; Stokes, Ashley M; Branca, Rosa Tamara; Warren, Warren S (J Chem Phys, 2009-11-28)
      A recent quantum computing paper (G. S. Uhrig, Phys. Rev. Lett. 98, 100504 (2007)) analytically derived optimal pulse spacings for a multiple spin echo sequence designed to remove decoherence in a two-level system coupled ...
    • Probing near-infrared photorelaxation pathways in eumelanins and pheomelanins. 

      Piletic, Ivan R; Matthews, Thomas E; Warren, Warren S (J Phys Chem A, 2010-11-04)
      Ultraviolet-visible spectroscopy readily discerns the two types of melanin pigments (eumelanin and pheomelanin), although fundamental details regarding the optical properties and pigment heterogeneity are more difficult ...