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157 results on '"Naoki Chiba"'

151. Quality of life in reflux and dyspepsia. Development and psychometric documentation of a disease-specific questionnaire (QOLRAD)

Author

E. Grace, S Veldhuyzen van Zanten, Naoki Chiba, Philip S. Schoenfeld, R. Colin, Nicholas J. Talley, Ola Junghard, M A Bigard, Michael A. Kamm, Des Leddin, Ingela Wiklund, and Pierre Paré

Subjects
Disease specific, medicine.medical_specialty, Documentation, Quality of life (healthcare), Hepatology, business.industry, Family medicine, Gastroenterology, medicine, Reflux, business
Published
1998
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153. Preparative Bioorganic Chemistry, XI Preparation of the Enantiomers of Paraconic Acid Employing Lipase-Mediated Asymmetric Hydrolysis of Prochiral Diacetates as the Key Step

Author

Kenji Mori and Naoki Chiba

Subjects
Hydrolysis, Paraconic acid, biology, Chemistry, Stereochemistry, Organic Chemistry, biology.protein, Bioorganic chemistry, Organic chemistry, Physical and Theoretical Chemistry, Enantiomer, Lipase
Abstract

(S)-(-)-Paraconic acid (1) was prepared from 2-(acetoxymethyl)-3-phenylpropyl acetate (4) by its asymmetric hydrolysis with pig pancreatic lipase as the key step. Similarly, (R)-(+)-1 was prepared from 2-(acetoxymethyl)-4-pentenyl acetate (2) by its asymmetric hydrolysis with lipase MY. Praparative Bioorganische Chemie, XI. – Darstellung der Enantiomeren von Paraconsaure durch Lipase-katalysierte asymmetrische Hydrolyse von prochiralen Diacetaten als Schlusselschritt Es wird die Darstellung von (S)-(-)-Paraconsaure (1) aus [2-(Acetoxymethyl)-3-phenylpropyl]acetat (4) durch dessen asymmetrische Hydrolyse mit Schweine-Pankreas-Lipase als Schlusselreaktion beschrieben. Ahnlich erhalt man (R)-(+)-1 aus [2-(Acetoxymethyl)-4-pentenyl]acetat (2) durch dessen Hydrolyse mit Lipase MY.

Published
1989
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154. Spectrophotometric Studies on Copper Chelates of Oxine and its N-Oxide

Author

Naoki Chiba and Yoshinori Kidani

Subjects
chemistry.chemical_compound, Ethanol, Chemistry, Drug Discovery, Inorganic chemistry, Oxide, chemistry.chemical_element, Chelation, General Chemistry, General Medicine, Copper, Nuclear chemistry
Abstract

Spectrophotometric studies of copper complexes of oxine and its N-oxide were carried out in ethanol solutions. At pH 8.0, the chelates of both oxine and its N-oxide indicated the normal complex and, when the measurements were carried out in an acid medium, the formation of a cation complex was taken into consideration.

Published
1959
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157. The urea breath test for Helicobacter pylori infection: taking the wind out of the sails of endoscopy.

Author

Fallone, Carlo A., van Zanten, Sander J.O.V., and Naoki Chiba

Subjects
HELICOBACTER pylori infections, GASTROENTEROLOGY, NONINVASIVE diagnostic tests, HOSPITAL gastroenterology services, DIAGNOSIS
Abstract

Reports on the Urea breath test (UBT) used in the detection of Helicobacter pylori infection. Popularity of the UBT as a noninvasive test for diagnosing H. pylori and for confirming eradication after treatment; Biggest problem which lies in its unavailability; Elimination of the need for a gastroscopic or barium examination when the UBT is used properly.

Published
2000

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