Thieno[3,4‐c]phosphole‐4,6‐dione: A Versatile Building Block for Phosphorus‐Containing Functional π‐Conjugated Systems

A versatile phosphorus‐containing π‐conjugated building block, thieno[3,4‐c]phosphole‐4,6‐dione (TPHODO), has been developed. The utility of this simple but hitherto unknown building block has been demonstrated by preparing novel functional organophosphorus compounds and bandgap‐tunable conjugated polymers.     

Mollification of Cytotoxicity of Sulfated Polysaccharides by Fibroblast Growth Factors1

Abstract

Sulfated polysaccharide which had a relatively high degree of sulfation showed cytotoxicity to 3T3-L1 fibroblasts. Acidic and basic fibroblast growth factors inhibited the cell damage caused by the sulfated polysaccharides, while epidermal growth factor and platelet growth factor had no effects.     

Synthesis of a New Polymer Containing Uridine and Galactose as Pendent Groups

Abstract

A new styrene compound containing a derivatized undine unit, that is, 2′,3′-O-isopropylideneuridine 5′-p-styrenesulfonate (1), was synthesized and polymerized with AIBN as an initiator. Removal of protecting isopropylidene groups from the obtained polymer gave uridine-containing polystyrene. Uridine-containing polystyrene was synthesized also by the polymerization of the deprotected monomer (2), which had been prepared by removal of isopropylidene group from 1. Copolymerization of 1 with a styrene monomer having a galactosyl moiety, that is, N-p-vinylbenzyl-4-O-(β- d -galactopyranosy)- d -gluconamide¹ (3), was carried out in dimethyl sulfoxide. However, the deprotection of the obtained copolymer failed, because the lactonamide portion was severed in the process of deisopropylidenation. On the other hand, the copolymerization of 2 with 3 in dimethylformamide and in water with AIBN as an initiator gave the target copolymer which contained both uridine and galactose residues. Polymers and copolymers were characterized by ¹H NMR spectroscopy.     

Luminescent properties of (Y,Gd)BO3:Bi,RE (RE=Eu, Tb) phosphor under VUV/UV excitation

Bi³⁺- and RE³⁺-co-doped (Y,Gd)BO₃ phosphors were prepared and their luminescent properties under vacuum ultraviolet (VUV)/UV excitation were investigated. Strong red emission for (Y,Gd)BO₃:Bi³⁺,Eu³⁺ and strong green emission for (Y,Gd)BO₃:Bi³⁺,Tb³⁺ are observed under VUV excitation from 147 to 200 nm with a much broader excitation region than that of single Eu³⁺-doped or Tb³⁺-doped (Y,Gd)BO₃ phosphor. Strong emissions are also observed under UV excitation around 265 nm where as nearly no luminescence is observed for single Eu³⁺-doped or Tb³⁺-doped (Y,Gd)BO₃. The luminescence enhancement of Bi³⁺- and RE³⁺-co-doped (Y,Gd)BO₃ phosphors is due to energy transfer from Bi³⁺ ion to Eu³⁺ or Tb³⁺ ion not only in the VUV region but also in the UV region. Besides, host sensitization competition between Bi³⁺ and Eu³⁺ or Tb³⁺ is also observed. The investigated phosphors may be preferable for devices with a VUV light 147-200 nm as an excitation source such as PDP or mercury-free fluorescent lamp.     

Elastic and inelastic scattering of vector polarized deuterons from even samarium isotopes at 56 MeV

Differential cross sections and vector analyzing powers of deuteron elastic and inelastic scattering have been measured at 56 MeV over the whole range of the even samarium isotopes. Comprehensive analyses were performed with the optical model and the coupled-channels formalism. In the optical model analysis, calculations with a global parameter set could reproduce the experimental data only for the vibrational nuclei. The strong coupling approximation was applied assuming the ^{144, 148, 150}Sm to be harmonic vibrators and the ^152,154Sm symmetric rotators. The 2^λ (λ = 2, 3, 4, 6) pole deformation parameters were deduced from a systematic coupled-channels analysis. The transition strengths were extracted from the deformed optical potentials and compared with the corresponding electromagnetic ones. The transition rates for the rotational nuclei agreed with the electro-magnetic ones, but those for the vibrational nuclei gave the systematically smaller values. The latter fact was attributed to the difference between the proton and neutron transition matrix elements near the neutron-closed-shell nuclei. The ratios of the two matrix elements were obtained.     

Analyzing power of the neutron continuum spectrum for the 93Nb(→p, nX) reaction at 65 MeV and a DWBA analysis

The analyzing power of neutron continuum spectrum for the ⁹³Nb($\text{→p}$, nX) reaction at 65 MeV was measured for a wide angular range ?_n = 20° – 130°. The analyzing powers are positive and large at large angles ?_n > 40°. The characteristic features in the analyzing power for the ⁹³Nb($\text{→p, nX}$) reaction are very similar to those for the ⁹³Nb($\text{→p}$, p'X) reaction indicating the importance of a common reaction mechanism for both reactions. A DWBA calculation was performed and compared with the data. The calculation for E_X = 14 MeV reproduced the cross sections but failed to reproduce the analyzing powers.     

65 MeV polarized proton elastic scattering and the effective two-body interaction range

Elastic scattering of polarized protons from sd and fp shell nuclei has been studied with high-purity germanium detectors. The mean square radius of the central real part of the fitted optical potential was found to be of the form $\text{a}\text{+}\text{bA}{}^{\mathrm{<mtext>2</mtext><mtext>3</mtext>}}$. Comparison with the radius from electron scattering gives the range of the effective two-body interaction and its A dependence as $\text{〈}\text{r}{}^2\text{〉}{}_{\mathrm{d}}\text{=(4.5±0.4)+(0.16±0.03)}\text{A}{}^{\mathrm{<mtext>2</mtext><mtext>3</mtext>}}\text{fm}{}^2$.     

Purification by centrifugal partition chromatography of amphiphilic compounds, glycolipids and pseudo-glycolipids synthesized by using cells

Centrifugal partition chromatography (CPC) was applied to separate amphiphilic glycolipids and pseudo-glycolipids synthesized by using cells. Neutral and acidic lipid fractions were isolated by CPC under suitable conditions respectively. Separation of neutral lipid, Gb3-type and Gb4-type oligosaccharide synthesized by using cells, was performed with a two-phase solvent system composed of chloroform-methanol-water at a volume ratio of 5:6:4. On the other hand, separation of acidic lipid, GM3-type oligosaccharide synthesized by using cells, and ganglioside extracted from rat brain were performed with a two-phase solvent system composed of butanol-ethanol-1% acetic acid at a volume ratio of 4:1:5. 8.3mg of Gb3 analogue, 5.1mg of Gb4 analogue, and 19.5mg of GM3 analogue were purified from 3.2l of culture medium obtained by incubation of African green-monkey kidney (Vero) cells with 50 microM n-dodecyl beta-lactoside using CPC.