Late Pleistocene Flora from the Pacific Coast of Fukushima Prefecture, Japan

Based upon the abundant fossil plants collected from the Tsukabara Formation of the third of the five terraces recognized along the Pacific coastal area of Fukushima Prefecture in Northeast Honshu, Japan, analysis was made of the vegetation assemblages, interpretation of the paleoecology, determination of the geological age, and the relationship of the Tsukabara Formation to Pleistocene eustatic movements. From the results of investigation of the cited items it was judged that the fossil flora from the Tsukabara Formation represents the vegetation that fluorished during the last high sea-level and moderate climate of the Late Pleistocene age along the Pacific coast of Fukushima Prefecture. Remarks and or descriptions are given to certain of the plant species

CONTENTS, PREFACE, ACKNOWLEDGMENTS, INTRODUCTION

CONTENTS, PREFACE, ACKNOWLEDGMENTS, INTRODUCTIO

Bacteriophage-Induced Antigenic Conversion and Transduction of Drug Resistance in Group E Salmonellas

It has been demonstrated that the phages obtained from SM-resistant cells of group E2, or propagated on SM-resistant cells of group E1 were capable of transducing SM-resistance in SM-sensitive cells of group E1. In some instances, the transmission of drug resistance was associated with antigenic change in recipient cells, while in others the former was not associated with the latter. It was also confirmed that antigenic conversion was associated with lysogenization of recipient cells, while the transmission of drug resistance was not associated with lysogenization unless being associated with antigenic conversion. The differences were discussed between the transmission of SM-resistance or the transduction and the phage-induced antigenic conversion

Mossbauer Spectrometer for Measurements in High Magnetic Fields(Part II. Several Instruments and Techniques Developed in HFLSM)

A Mossbauer spectrometer has been designed and constructed for measurements in high magnetic fields beyond 20 T which are generated by a hybrid magnet in the High Field laboratory for Superconducting Materials at Tohoku University. Simple ways were adopted in order to avoid some obstacles for the spectroscopy. The most serious problem was electromagnetic inductions occurring at metallic components in a source drive system. It was found that the replacement of an aluminum drive-rod to a Bakelite one improved remarkably the Mossbauer spectrum. Test measurements of a-Fe at room temperature were satisfactorily performed under the magnetic fields up to 10 T. The results agreed well with the theoretical expectation

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