The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Alexis T. Bell - One of the best experts on this subject based on the ideXlab platform.
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Enhanced activity of gold-supported cobalt oxide for the electrochemical evolution of oxygen.
Journal of the American Chemical Society, 2011Co-Authors: Alexis T. BellAbstract:Scanning electron microscopy, linear sweep voltammetry, chronoamperometry, and in situ surface-enhanced Raman spectroscopy were used to investigate the electrochemical oxygen evolution reaction (OER) occurring on cobalt oxide films deposited on Au and other metal substrates. All experiments were carried out in 0.1 M KOH. A remarkable Finding is that the turnover frequency for the OER exhibited by ∼0.4 ML of cobalt oxide deposited on Au is 40 times higher than that of bulk cobalt oxide. The activity of small amounts of cobalt oxide deposited on Pt, Pd, Cu, and Co decreased monotonically in the order Au > Pt > Pd > Cu > Co, paralleling the decreasing electronegativity of the substrate metal. Another Notable Finding is that the OER turnover frequency for ∼0.4 ML of cobalt oxide deposited on Au is nearly three times higher than that for bulk Ir. Raman spectroscopy revealed that the as-deposited cobalt oxide is present as Co3O4 but undergoes progressive oxidation to CoO(OH) with increasing anodic potential. Th...
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Enhanced activity of gold-supported cobalt oxide for the electrochemical evolution of oxygen
Journal of the American Chemical Society, 2011Co-Authors: Boon Siang Yeo, Alexis T. BellAbstract:Scanning electron microscopy, linear sweep voltammetry, chronoamperometry, and in situ surface-enhanced Raman spectroscopy were used to investigate the electrochemical oxygen evolution reaction (OER) occurring on cobalt oxide films deposited on Au and other metal substrates. All experiments were carried out in 0.1 M KOH. A remarkable Finding is that the turnover frequency for the OER exhibited by ∼0.4 ML of cobalt oxide deposited on Au is 40 times higher than that of bulk cobalt oxide. The activity of small amounts of cobalt oxide deposited on Pt, Pd, Cu, and Co decreased monotonically in the order Au > Pt > Pd > Cu > Co, paralleling the decreasing electronegativity of the substrate metal. Another Notable Finding is that the OER turnover frequency for ∼0.4 ML of cobalt oxide deposited on Au is nearly three times higher than that for bulk Ir. Raman spectroscopy revealed that the as-deposited cobalt oxide is present as Co(3)O(4) but undergoes progressive oxidation to CoO(OH) with increasing anodic potential. The higher OER activity of cobalt oxide deposited on Au is attributed to an increase in fraction of the Co sites present as Co(IV) cations, a state of cobalt believed to be essential for OER to occur. A hypothesis for how Co(IV) cations contribute to OER is proposed and discussed.
Boon Siang Yeo - One of the best experts on this subject based on the ideXlab platform.
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Enhanced activity of gold-supported cobalt oxide for the electrochemical evolution of oxygen
Journal of the American Chemical Society, 2011Co-Authors: Boon Siang Yeo, Alexis T. BellAbstract:Scanning electron microscopy, linear sweep voltammetry, chronoamperometry, and in situ surface-enhanced Raman spectroscopy were used to investigate the electrochemical oxygen evolution reaction (OER) occurring on cobalt oxide films deposited on Au and other metal substrates. All experiments were carried out in 0.1 M KOH. A remarkable Finding is that the turnover frequency for the OER exhibited by ∼0.4 ML of cobalt oxide deposited on Au is 40 times higher than that of bulk cobalt oxide. The activity of small amounts of cobalt oxide deposited on Pt, Pd, Cu, and Co decreased monotonically in the order Au > Pt > Pd > Cu > Co, paralleling the decreasing electronegativity of the substrate metal. Another Notable Finding is that the OER turnover frequency for ∼0.4 ML of cobalt oxide deposited on Au is nearly three times higher than that for bulk Ir. Raman spectroscopy revealed that the as-deposited cobalt oxide is present as Co(3)O(4) but undergoes progressive oxidation to CoO(OH) with increasing anodic potential. The higher OER activity of cobalt oxide deposited on Au is attributed to an increase in fraction of the Co sites present as Co(IV) cations, a state of cobalt believed to be essential for OER to occur. A hypothesis for how Co(IV) cations contribute to OER is proposed and discussed.
S Krishna V Chaitanya - One of the best experts on this subject based on the ideXlab platform.
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mucoepidermoid carcinoma involving the palate with lamellated calcifications a Notable Finding
European Journal of General Dentistry, 2016Co-Authors: Anuradha Ananthaneni, Haripriya Ponnapalli, Mohammad Asif Kiresur, S Krishna V ChaitanyaAbstract:Mucoepidermoid carcinoma (MEC) is a malignant glandular epithelial neoplasm of the salivary glands with an unpredictable behavior and a tendency to recur. The tumor is composed of mucous secreting cells, epidermoid cells, intermediate cells, columnar cells, and clear cells in varying proportions. Calcification in the salivary gland tumors is less common and minuscule in size; these can be seen in the benign tumor-like pleomorphic adenoma to malignant tumor-like MEC. Calcifications in MEC are considerably sparse and commonly associated with high-grade tumors. We present a case of MEC with lamellated calcifications present in the palate of a 43-year-old male patient.
J Nishimura - One of the best experts on this subject based on the ideXlab platform.
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Diffuse intervertebral disk calcification in a patient with rheumatoid arthritis.
The journal of medical investigation : JMI, 2020Co-Authors: M Nakamura, S Shiokawa, Y Miyazaki, H Kita, K Setoguchi, K Kawahata, Y Misaki, K Yamamoto, J NishimuraAbstract:A patient with seronegative rheumatoid arthritis (RA) who presented with intervertebral disk calcification (IDC) of several thoracic and lumbar intervertebral disks in herein described. There was no evidence of any other coexisting diseases such as ochronosis and hemochromatosis, but a remarkable degree of polyclonal hypergammaglobulinemia was observed as a Notable Finding. Although the appearance of IDC on T1-weighted images on magnetic resonance is controversial, no increased signal intensity was observed in our patient. To the best of our knowledge, this is the first report of IDC in RA.
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Diffuse intervertebral disk calcification in a patient with rheumatoid arthritis.
The Journal of Medical Investigation, 2000Co-Authors: M Nakamura, S Shiokawa, Y Miyazaki, H Kita, K Setoguchi, K Kawahata, Y Misaki, K Yamamoto, J NishimuraAbstract:A patient with seronegative rheumatoid arthritis (RA) who presented with intervertebral disk calcification (IDC) of several thoracic and lumbar intervertebral disks is herein described. There was no evidence of any other coexisting diseases such as ochronosis and hemochromatosis, but a remarkable degree of polyclonal hypergammaglobulinemia was observed as a Notable Finding. Although the appearance of IDC on T1-weighted images on magnetic resonance is controversal, no increased signal intensity was ob- served in our patient. To the best of our knowledge, this is the first report of IDC in RA. J. Med. Invest. 47 : 152-154, 2000
Anuradha Ananthaneni - One of the best experts on this subject based on the ideXlab platform.
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mucoepidermoid carcinoma involving the palate with lamellated calcifications a Notable Finding
European Journal of General Dentistry, 2016Co-Authors: Anuradha Ananthaneni, Haripriya Ponnapalli, Mohammad Asif Kiresur, S Krishna V ChaitanyaAbstract:Mucoepidermoid carcinoma (MEC) is a malignant glandular epithelial neoplasm of the salivary glands with an unpredictable behavior and a tendency to recur. The tumor is composed of mucous secreting cells, epidermoid cells, intermediate cells, columnar cells, and clear cells in varying proportions. Calcification in the salivary gland tumors is less common and minuscule in size; these can be seen in the benign tumor-like pleomorphic adenoma to malignant tumor-like MEC. Calcifications in MEC are considerably sparse and commonly associated with high-grade tumors. We present a case of MEC with lamellated calcifications present in the palate of a 43-year-old male patient.
