Voltammetric behavior of copper(I)oxide modified carbon paste electrode in the presence of cysteine and ascorbic acid

The electrochemical behavior of a copper(I)oxide (Cu2O) modified carbon paste electrode (MCPE) was investigated in different buffer solutions and in the presence of ascorbic acid (AA) and cysteine (RS). Working conditions such as pH, mineral oil, and modifier ratio were optimized. Voltammetric results revealed that RS forms rather stable complexes with Cu(I) which has a high electrocatalytic reduction peak current at -0.65 V versus SCE in borate buffer (pH 9.2). In the case of AA, a complexation occurred with Cu(II) species at the electrode surface, rather than Cu(I). The electrocatalytic reduction peak current of the Cu(II)-AA complex was observed at -0.07 V in phosphate buffer at pH 6.9. Linear responses were observed in the range 2.0×10-9 to 3.0×10-8 M with a 0.9954 correlation coefficient for RS and 1.0×10-9 to 2.0×10-8 M with a 0.9961 correlation coefficient for AA. © 2004 Elsevier B.V. All rights reserved

Static and flow-injection voltammetric determination of periodate by reduction at a rotating platinum wire electrode

A method for periodate determination was developed as a result of static and flow-injection voltammetric investigations where a rotating platinum wire electrode was employed. In the static system, 4.0 × 10 -5 -4.2 × 10 -4 M periodate could be determined in the cell in pH 7.0-74.5 phosphate buffer. In the flow-injection system, periodate solutions of 20-100 µl were injected into the carrier stream of a phosphate buffer solution at pH 7.0. The flow rates were in the range of 1.0-1.7 ml min -1 . The peak currents were measured at -0.07 V against a saturated calomel electrode. The determination of periodate concentrations in the range 1.0 × 10 -5 -1.0 × 10 -4 M was possible with a throughput of 15-40 samples per hour. © 1994

A patient with WT syndrome and Castleman disease

PubMed ID: 7754753WT syndrome, an autosomal dominant condition, combines hematological abnormalities with mild lib defects. Anemia, pancytopenia, leukemia and lymphoma can occur at varying ages from childhood to middle age. Limb defects include ulnar and radial defects, bifid or hypoplastic thumbs and cutaneous syndactyly. Castleman disease is characterized by tumorous masses of lymphoid tissue showing plasma cell or hyaline vascular type changes in histological specimens. A 13 year old boy, diagnosed as WT syndrome with ulnar and radial deviation and 5th finger clinodactyly also had neutropenia, cervical and mediastinal lymphadenopathy. Histology of the cervical lymph node showed angiofollicular hyperplasia of the hyaline-vascular type (Castleman disease). This interesting patient is reported because Castleman disease, together with WT syndrome has not been previously described. 1995 Japan Pediatric Societ

HEART AND AORTA ANOMALIES IN TURNER SYNDROME AND RELATION WITH KARYOTYPE

Objectives. Turner Syndrome (TS) is associated with a high risk of cardiac anomalies and cardiovascular disease. We aimed to evaluate patients with TS (n=33) for cardiac and aortic pathology using thorax magnetic resonance angiography (MRA)