Direct measurement of blue fluorescence lifetimes in polymethine dyes using a picosecond laser

The lifetimes of the blue fluorescence from a higher excited state are directly measured to be 80 ± 30 ps for cryptocyanine and 35 ± 15 ps for DTTC in methanolic solution. The relaxation processes associated with electronic excited states are discussed in the case of DTTC.     

Base promoted oxidative decarboxylation of ethyl phenylglycinate via oxaziridine

Base catalyzed decompositions of 2-(α-ethoxycarbonyl-benzyl)-3-phenyl-oxaziridines carried out in benzene in an atmosphere of oxygen yielded N-benzoyl benzamides along with ethyl phenylglyoxylate imine and benzaldehydes.     

High-performance gel filtration of water-soluble samples on polyvinyl alcohol columns

The chromatographic behaviour in aqueous solution of pullulans, polyethylene glycols, peptides and proteins with different molecular weights on newly developed polyvinyl alcohol columns (Asahipak GS column series: GS-310, GS-320, GS-510 and GS-520) has been investigated. Pullulans and polyethylene glycols eluted according to the gel filtration mode, so both series of compounds produced almost equal calibration curves for GS-310 and GS-320 and for GS-510 and GS-520; the exclusion limits on GS-310 and GS-320 and on GS-510 and GS-520 were found to be ca. 40,000 and 300,000, respectively. Peptides and proteins were found to adsorb slightly on the columns. However, the plots of the elution volumes against the logarithm of the molecular weights for many of the substrates tested gave rise to the linear calibration curves. Recovery of several crude proteins was also studied for the columns and high values were obtained (81–100%). The effects of changes in the flow-rate, temperature and concentration of electrolytes added to the eluents, on the retention of all four types of compound are also reported.     

Liftings and Mean Value Theorems for Automorphic L-Functions

A general mean value theorem for Dirichlet series, with a sharperror estimate near the boundary of the critical strip, is proved.Applications of this theorem to various automorphic L-functionsare discussed. Moreover, sharp upper bounds of mean square valuesof L-functions are obtained when they are attached to liftedforms, such as Doi–Naganuma and Ikeda lifts in the theoryof Siegel modular forms. 2000 Mathematics Subject Classification11F66, 11M41.     

Interpolation of contour intervals in Moire topography by phase modulation

A trial has been performed with respect to the interpolation of contour intervals in Moiré topography by making use of phase modulation. A simple mechanical system can bring improved results for the precise measurements of shape of a specimen.     

Non-level semi-standard graded Cohen–Macaulay domain with h-vector (h0,h1,h2)

Let $\mathbb{k}$ be an algebraically closed field of characteristic 0, and $A={?}_{i\in \mathbb{N}}{A}_i$ a Cohen–Macaulay graded domain with $A_0=\mathbb{k}$. If A is semi-standard graded (i.e., A is finitely generated as a $\mathbb{k}[A_1]$-module), it has the h-vector$(h_0,h_1,\dots ,h_s)$, which encodes the Hilbert function of A. From now on, assume that $s=2$. It is known that if A is standard graded (i.e., $A=\mathbb{k}[A_1]$), then A is level. We will show that, in the semi-standard case, if A is not level, then $h_1+1$ divides $h_2$. Conversely, for any positive integers h and n, there is a non-level A with the h-vector $(1,h,(h+1)n)$. Moreover, such examples can be constructed as Ehrhart rings (equivalently, normal toric rings).     

Synthesis and properties of a new fluorescent bicyclic 4-N-carbamoyldeoxycytidine derivative

[reaction: see text] A bicyclic 4-N-carbamoyldeoxycytidine derivative (1, dC(hpp)) geometrically locked was synthesized as a new fluorescent nucleobase. The hybridization properties of oligodeoxynucleotides containing dC(hpp) were investigated by use of T(m) analysis. It was found that dC(hpp) forms stable base pairs not only with the complementary guanine base, but also with the adenine base. Interestingly, the fluorescence of dC(hpp) was suppressed only when a dC(hpp)-dG base pair was formed.     

Design and synthesis of novel chiral spiro ionic liquids

[reaction: see text] Novel chiral imidazolium salts have been synthesized as examples of chiral ionic liquids with a spiro skeleton. Effects of N-substituents and counteranions on the melting point of spiro imidazolium salts and their chiral discrimination abilities are described.     

Anomalous heat evolution of deuteron implanted al upon electron bombardment III - try to observe the nuclear d-d reaction

In previous papers, one of the authors (K. K.) has observed the anomalous melting of the surface layer of deuteron implanted Al, containing so-called "tunnel structures", on the electron bombardment in transmission electron microscope. In the present paper, we intended to observe the evidence of the d-d nuclear reaction, expecting neutron emission, associated with the melting phenomenon. However, the result was rather unexpected. The melting phenomenon was certainly observed under the same experimental conditions as before. But, in spite of the melting, neutron emission associated with the nuclear reaction was not observed. And, more unexpectedly, X-ray emission of energy less than roughly 400 v keV was observed when specimens with a bubble structure, which never showed melting, were bombarded with electron beams. Several conceivable mechanisms are discussed which, however, are all not convincing to explain the melting. The melting is attributed to some excess energy generation. The error estimation of the radiation measurements was undertaken.