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Open Access Publications from the University of California

Scholarly Works (4 results)

  • Article
  • Peer Reviewed
Proceedings of the Annual Meeting of the Cognitive Science Society, Volume 32 (2010)
    Cover page: A Bird’s-Eye View of Numerical Discrimination in the Wild
    • Thesis
    • Peer Reviewed
    UCLA Electronic Theses and Dissertations (2007)

    Intra-operative imaging during cardiac surgery remains insufficient for many applications. For example, intra-operative visualization of heart valves has not been standardized and current research techniques primarily utilize ultrasound, which exhibits poor contrast at the interface of blood and valve tissue. Sufficient resolution and contrast have been obtained with MRI, but the technique is slow and it is not currently practical nor routine to perform real-time MRI imaging for intraoperative use. Standard optical endoscopy has not translated because of the significant scattering and absorption of blood at the UV/VIS wavelengths. However, based on Mie optical scattering theory, imaging through blood using infrared light is theoretically feasible. In this project, we utilized components and technology from IR wavelengths (e.g. 1550 nm) to design a rigid endoscope that optimized tradeoffs between absorption and scattering to achieve optical imaging in real-time through blood. The results of optical ray-tracing simulations demonstrated that a rigid endoscopic system that images through blood with 50 μm resolution is feasible.

      Cover page: Trans-blood Imaging in the Heart using a Real-time Infrared Endoscopic System
      • Article
      • Peer Reviewed
      UC Irvine Previously Published Works (2003)
      Spatial and temporal distributions of atmospheric CH3Cl, CH3Br, C2H5Cl, and C2H5Br were determined by gas chromatography/mass spectrometry measurements at coastal California and inland sites from 1996 through 1999. The median concentrations observed at a clean coastal site were 585, 13.1, 3.3, and 0.3 ppt (parts per trillion) for CH3Cl, CH3Br, C2H5Cl, and C2H5Br, respectively. To our knowledge, these represent the first quantitative measurements of atmospheric C2H5Cl. High variation was seen in CH3Br and C2H5Cl measurements from the other two California sites, a rural inland site and a coastal site with urban influence. When compared to the California stationary sites, the median Northern Hemispheric results from measurements taken along Pacific Ocean transects between California and New Zealand from 1996 through 1999 were similar for CH3Cl (594 ppt) and C2H5Br (0.3 ppt) but lower for CH3Br (10.4 ppt) and C2H5Cl (2.6 ppt). Median concentrations of Southern Hemispheric CH3Br (9.4 ppt), C2H5Cl (1.6 ppt), and C2H5Br (less than 0.2 ppt) were lower than the Northern Hemispheric results. No significant correlation was found between the atmospheric concentrations of the methyl halides with the ethyl halides.
      • 9 supplemental images
      Cover page: Measurements of ambient atmospheric C2H5Cl and other ethyl and methyl halides at coastal California sites and over the Pacific OceanCreative Commons 'BY' version 4.0 license
      • Article
      • Peer Reviewed
      UC Davis Previously Published Works (2015)
      Metagenomics was used to characterize viral genomes in clinical specimens of horses with various organ-specific diseases of unknown aetiology. A novel parvovirus as well as a previously described hepacivirus closely related to human hepatitis C virus and equid herpesvirus 2 were identified in the cerebrospinal fluid of horses with neurological signs. Four co-infecting picobirnaviruses, including an unusual genome with fused RNA segments, and a divergent anellovirus were found in the plasma of two febrile horses. A novel cyclovirus genome was characterized from the nasal secretion of another febrile animal. Lastly, a small circular DNA genome with a Rep gene, from a virus we called kirkovirus, was identified in the liver and spleen of a horse with fatal idiopathic hepatopathy. This study expands the number of viruses found in horses, and characterizes their genomes to assist future epidemiological studies of their transmission and potential association with various equine diseases.
        Cover page: Exploring the virome of diseased horses.
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