List of Dissertation Abstract (Environment and Natural Sciences)
NameSupervisor

Title

Abstract
Photo-reactive organic dyes have attracted much attention as a new class of functional materials towards

Study on the photoreaction of 2,5Shinyabis(dibenzylamino)-3,6-dichloro-p-MATSUMOTO

benzoquinone and its reaction

In-Sub Shinproducts.

various applications. The benzyl groups of 2,5-bis(dibenzylamino)-3,6-dichloro-p-benzoquinone (1) were
found to be easily eliminated under ambient light conditions. In this study, a plausible reaction pathway ofthis photoinduced debenzylation of 1 was demonstrated on the basis of the determination of new reaction
products as well as the trace of the reaction using various analytical techniques under different experimental
conditions. This study also included the reaction of 1 in the solid state and polymorphism of a reaction
product.

The genus Polyptychoceras is a heteromorph ammonoid that flourished in the northern Pacific realm in theTaxonomy
Kenji IKUNORyoji WANIofthegenus Late Cretaceous. In this dissertation, the taxonomy of Polyptychoceras was studied using nomenclatural,

Polyptychoceras

morphological, and stratigraphical approaches. The nomenclatural review revealed the nomenclatural statuses(Ammonoidea: Diplomoceratidae) of hitherto proposed names. The species diversity of Polyptychoceras from Hokkaido, Sakhalin, andfrom the northern Pacific realm

Vancouver was clarified through the observation of shell morphology. This genus was subdividable to twogroups based on the characteristics of the shell surface ornamentation.

Development of self-propagative Hydroxamic acids are found in natural products and bioactive compounds. Recently, the reactivity andNaoyaKiyoshi

LossenOHTSUKA

HONDA

synthesis of chiral hydroxamic acid paper, we developed base-mediated self propagative Lossen rearrangement to obtain primary amines, andligands.

rearrangement

and property of hydroxamic acids have attracted the attention in the research field of organic synthesis. In thisdesign and synthesis of novel chiral cyclic hydroxamic acids.

KentaKiyoshi

TANAKA

HONDA

Development of pericyclic reaction
forenvironmental

YumikoMasahiro

TSUBOKAWAISHIKAWAloading developed. In particular, facile organophotoredox catalysts efficiently proceed the reaction under green lightreduction

Sintering

The clean organic synyhesis using ''organic catalyst'', ''low temperature conditions'', ''visible light'' has beenor sun light. This study provides a sustainable synthetic process for reduction of environmental load.

ofpolycrystalline

clinopyroxene and polycrystalline
olivine and ultrasonic velocity
measurements under high P-T
conditions

Fine-grained polycrystalline clinopyroxene and polycrystalline olivine were successfully sintered from nanosized powders of minerals. P and S wave velocities (Vp and Vs, respectively) of polycrystalline clinopyroxene
are determined at high temperature and high pressure conditions. At room temperature, Vp, Vs and Vp/Vs
increased during pressurization. On the other hand, at 1.0 GPa, Vp and Vs decreased and Vp/Vs slightly
increased with increasing temperature. The elastic constants of polycrystalline clinopyroxene with grain sizeof submicron scale obtained in this study are smaller than previously published data.

Foraminifera are marine uniceller protist. Foraminiferal fossils have been found the early Cambrian. It hasReading the fine print: Ultra-Yukiko
Ryoji WANINAGAImicrostructures of foraminiferal
calcification

been shown that the foraminiferal test changes its morphology and chemical composition to a certain extent,depending on the environment. For this reason, foraminifera is broadly used for paleoenvironmental study.
However, calcification process of the foraminifera is not fully understood yet. This study has observed cellular
activities and ultra-microstructures with time-series samples of shell formation to reveal the detailed
foraminiferal calcification process.