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K T Wu

Publications and source records attributed to K T Wu.

At least 19 recordsLinked to original sources
PubMed2005

Particle size and magnetic field-induced optical properties of magnetic fluid nanoparticles.

Magnetite nanoparticles with diameters of 7, 9, and 12 nm have been prepared by a chemical coprecipitation method. The transmission of light through magnetic fluid containing these nanoparticles has been investigated as a function of film thickness with wavelength between 400 and 750 nm, and applied magnetic fields up to 275 Oe. The transmission threshold shifts to the lower wavelength side with decreasing magnetic fluid film thickness as well as the particle size. For a given film thickness, the transmittance increases with increasing magnetic field for films with a particle size of 7 and 9 nm, but decreases in the 12-nm film. This is attributed to the competition between the van der Waals and dipole-dipole interaction.

Journal Article↗
PubMed2001

Antioxidant properties of methanolic extracts from several ear mushrooms.

Five kinds of ear mushrooms are commercially available in Taiwan, including black, red, jin, snow, and silver ears. Methanolic extracts were prepared from these ear mushrooms, and their antioxidant properties were studied. For all methanolic extracts from ear mushrooms, the antioxidant activities in the 1,3-diethyl-2-thiobarbituric acid method were moderate (38.6 approximately 74.6%) at 1.0-5.0 mg/mL. Methanolic extracts from red, jin, and snow ears showed excellent antioxidant activities in the conjugated diene method at 5.0 mg/mL. At 5.0 mg/mL, reducing powers of methanolic extracts were in the descending order of snow > black approximately red approximately jin > silver ears. The scavenging effect of methanolic extracts from ear mushrooms on 1,1-diphenyl-2-picrylhydrazyl radicals was excellent except for that from silver ears. Ear mushroom extracts were not good scavengers for hydroxyl free radicals but were good chelators for ferrous ions. Naturally occurring antioxidants, including ascorbic acid, tocopherols, and total phenols, were found in the methanolic extracts. However, beta-carotene was not detected. Total antioxidant components were 15.69, 30.09, 27.83, 49.17, and 31.70 mg/g for black, red, jin, snow, and silver ears, respectively.

Agaricales↗
PubMed1997

Planned early neck dissection before radiation for persistent neck nodes after induction chemotherapy.

Optimal management of advanced neck metastases as part of an organ preservation treatment approach for head and neck squamous carcinoma (HNSC) is unclear. Since 1989, our management paradigm for patients on organ preservation was modified to incorporate planned early neck dissection before radiation therapy for patients who did not achieve a complete response (CR) of neck nodes after induction chemotherapy (IC). The purpose of this study was to determine if planned early neck dissection is a safe and effective approach in the management of advanced nodal disease as part of organ preservation. Fifty-eight consecutive patients with advanced HNSC who were entered in organ preservation trials using induction chemotherapy and radiation with surgical salvage were studied. Median follow-up was 26 months. Of the 58 patients, 71% were stage IV. Patients were grouped by nodal response to chemotherapy and N class, and were analyzed with respect to patterns of recurrence, complications, and survival. Overall, the rate of CR of neck nodes was 49%. Fifty-one percent had less than a complete response of neck nodes after IC and required planned early neck dissection. There were no significant differences in patterns of recurrence, complications, interval time to start of radiation, recurrence, or survival rates between the CR and less than CR groups. These data suggest that planned early neck dissection for patients with less than CR in the neck after IC is not detrimental with respect to neck relapse or overall survival. We believe that planned early neck dissection can be safely incorporated into future organ preservation treatment protocols for patients with advanced head and neck carcinoma.

Adult↗
PubMed1973

Hepatitis with Australia antigenemia following renal transplantation.

Over a seven-year period 18 of 125 patients who underwent renal transplantation developed hepatitis. Acute hepatic necrosis occurred in two, chronic aggressive hepatitis progressing to posthepatitic cirrhosis in eight, chronic persistent hepatitis in five, acute hepatitis with recovery in two and cholestatic hepatitis in one. Hepatic failure was the cause of death in four and a major contributing factor in three. Fifteen of the 18 were of blood Group A. After renal transplantation Australia antigen (Au) was present in the blood of 12 of the 15 patients with hepatitis who were tested and in one of 38 patients without clinical evidence of liver disease. Once present, Au persisted in all patients but one. Particles measuring 210 to 250 A, characteristic of Au, were seen in liver cells by electronmicroscopy in nine of the 10 patients examined who had hepatitis with Australia antigenemia, but they were not seen in the two patients studied with Au-negative hepatitis.

Acute Disease↗