Chronology of Daisen Plinian Tepharas Based on Correlation to the Lake Biwa Borehole Tephra Samples Using LA-ICP-MS Mineral Analysis

金沢大学大学院自然科学研究科島根大学大阪市立大学Scedule:17-18 March 2003, Vemue: Kanazawa, Japan, Kanazawa Citymonde Hotel, Project Leader : Hayakawa, Kazuichi, Symposium Secretariat: XO kamata, Naoto, Edited by:Kamata, Naoto

A SCINTIGRAPHIC STUDY OF MASS PERISTALSIS IN HUMAN COLON

Although many attempts have been made to study human colonic motility, the colonic transit is still poorly understood. Both spontaneous and neostigmine-induced peristalsis of the colon were studied with scintigraphy. A polythene tube was inserted into the cecum through a colonofiberscope. 37 MBq of ⁹⁹ᵐTc-DTPA and 75 ml of saline were instilled and dynamic scan was begun. Eight healthy volunteers were examined by the method above mentioned. The sampling time was set at fifteen seconds in six persons and three seconds in the rest. 0.5 mg of neostigmine was injected intravenously to stimulate the paristalsis when no peristalsis occurred within thirty minutes after the study was begun. Dynamic scanning was performed for sixty to ninety minutes. This scintigraphic study revealed that the spontaneous and induced peristalsis were almost identical on colonogram. ⁹⁹ᵐTc-DTPA solution was propelled from the cecum and ascending colon to the sigmoid colon or the rectum for about fifteen seconds during mass peristalsis. Colonogram (time-activity curve) enables us to analyze mass peristalsis easily and more objectively than colonoscintigram. The spontaneous and neostigmine-induced peristalsis seemed to be almost identical in all but one of eight subjects

A Holocene sea-level curve constructed from a single core at Osaka, Japan (A preliminary note)

A relative sea-level curve has been drawn based on 25 AMS 14C ages and paleodepths inferred from ostracodes in a Holocene core from Kitatsumori, Osaka, Japan. This is the first relative sea-level curve constructed from a single continuous core in siliciclastic sediments. The new curve indicates that the first flooding at this site was -21.5 m in depth below present mean sea-level at about 9200 calendar years B.P., that the maximum sea-level highstand of about +1.5 m was at 5500 to 5000 calendar years B.P. (about 800 years younger than previously thought), and that a relative sea-level decrease of about -1.2 m took place at about 2200 calendar years B.P. and that a relative sea-level increase of about +0.7 m occurred about 1700 calendar years B.P