Soo Kyung Jeong

Influence of Solvents on the Structural and Electrochemical Properties of Li [ Li0.2Ni0.1Co0.2Mn0.5 ] O2 Prepared by a Solvothermal Reaction Method

Solid solutions of Li[Li 0 . 2 N 0 . 1 Co 0 . 2 Mn 0 . 5 ]O 2 were prepared by solvothermal reaction with three different solvents, namely, methanol, ethanol, and 1-propasol. The prepared compounds were subjected to X-ray diffraction (XRD), Raman, Fourier transform infrared, and charge-discharge studies. XRD studies revealed that the prepared compounds are of layered structure with space group R3m. The sample which was prepared using 1-propanol as solvent delivered the highest discharge capacity of 205 mAh/g. The electrochemical and structural properties of the prepared compounds are influenced by the physical properties of the solvents.

Air- and bone-conducted cervical and ocular vestibular-evoked myogenic potentials in patients with superior vestibular neuritis

OBJECTIVE: To determine the characteristic changes in cervical (cVEMP) and ocular (oVEMP) vestibular evoked myogenic potentials to different stimuli by using air-conducted sound (ACS) and bone-conducted vibration (BCV) in patients with superior vestibular neuritis (SVN). BACKGROUND: There has been debate about the origin of the VEMP, especially the ocular VEMP (oVEMP) activated by ACS and BCV at different sites. DESIGN/METHODS: Using ACS and BCV stimuli, cVEMPs and oVEMPs were recorded in SVN patients (n=33) and normal controls (n = 45). RESULTS: ACS induced cVEMPs revealed mostly normal (81.9%) whereas results of ACS induced oVEMPs showed high rates of abnormalities (82%). oVEMP by BCV at the mid-frontal (Fz) revealed high rates of abnormalities (62.5%) especially on the contralesional eye and none of them showed abnormality on the ipsilesional eye. cVEMPs and oVEMPs induced by BCV at the mastoid process revealed dissociated results. cVEMP to mastoid BCV showed low rates of abnormalities (31.2%) whereas oVEMP to mastoid BCV revealed high rates of abnormalities (75%). CONCLUSIONS: The oVEMP in response to ACS may be mediated by the superior vestibular nerve, probably due to an activation of the utricular receptors. The high rates of abnormalities in Fz BCV oVEMP also suggest a dependence on the intactness of the superior vestibular nerve afferents. The dissociations in the abnormalities of cVEMP and oVEMP induced by BCV at the mastoid in patients with VN selectively involving the superior vestibular nerve suggest that the origin of the vestibular nerve afferents of oVEMP to mastoid BCV differ from those of cVEMP to mastoid BCV. Therefore oVEMP to mastoid BCV also reflects functions of the superior vestibular nerve afferents and most likely the utricular function. Disclosure: Dr. Oh has nothing to disclose. Dr. Kim has nothing to disclose. Dr. Shin has nothing to disclose. Dr. Yang has nothing to disclose. Dr. Jeong has nothing to disclose.