Showing papers by "Musashi University published in 1999"
TL;DR: In this article, the influence of humate formation on the adsorption of various ions on kaolinite and amorphous silica was studied using the multitracer technique, which simultaneously provided the solid-aqueous distributions of 32 elements, namely, Be, Na, Sc, V, Cr, Mn, Fe, Co, Zn, Ga, As, Se, Rb, Sr, Y, Zr, Tc, Ru, Rh, Ag, Te, Ba, Pm, Eu, Gd, Tm, Yb, Lu,
221 citations
TL;DR: In this article, a supercage of six-coordinated Fe(II) complex ions [FeL3]2+ (L = en, amp, bpy, dmbpy, phen, and dmphen) was characterized by UV−vis, XRD, Mossbauer spectroscopy, and IR.
Abstract: Six-coordinated Fe(II) complex ions [FeL3]2+ (L = en, amp, bpy, dmbpy, phen, and dmphen), prepared in a supercage of zeolite Y, were characterized by UV−vis, XRD, Mossbauer spectroscopy, and IR. The UV−vis spectra and XRD patterns of the zeolite encapsulating the Fe(II) complex ions show that [Fe(en)3]2+, [Fe(amp)3]2+, [Fe(bpy)3]2+, and [Fe(phen)3]2+ are formed in the zeolite supercage. The Mossbauer spectra of [Fe(bpy)3]2+ and [Fe(phen)3]2+ in the supercage gave extraordinarily large values of the quadrupole splitting for low-spin Fe(II) species, indicating that these complex ions in a supercage are distorted by a strong steric interaction with the zeolite lattice. The IR spectra of [Fe(bpy)3]2+ and [Fe(phen)3]2+ in the supercage as well as their Mossbauer results reveal that the complex ion is located in the supercage; (i) the 3-fold axis of the complex is parallel to that of the supercage, (ii) each of the three bidentate-ligand molecules in the complex faces to the 12-membered ring of the supercage, a...
44 citations
TL;DR: Ants pruned the plants near the edge of the trunk of the host tree most intensively, even the foliage of the lowest branch in shade, which supports the hypothesis that the main driving force which leads to pruning behavior is intercolony competition rather than improving the light condition of theHost tree.
Abstract: The early stages of colonization by Tetraponera (= Pachysima) aethiops (Pseudomyrmecinae) to its obligate host plant, Barteria fistulosa (Passifloraceae), was studied in Kahuzi-Biega National Park, Democratic Republic of Congo (formerly Zaire). In our observations, as many as 36 queens colonized a seedling, and all of the established colonies had just a single queen each. The ants depend totally on the products of scale insects which inhabit the domatia. The ants damage the terminal meristems of the branches where other incipient colonies may inhabit. This tip-biting behavior may deteriorate the nutritional condition of scale insects and suppress the growth of the competing colonies. Ants pruned the plants near the edge of the trunk of the host tree most intensively, even the foliage of the lowest branch in shade. This observation supports the hypothesis that the main driving force which leads to pruning behavior is intercolony competition rather than improving the light condition of the host tree.
28 citations
TL;DR: In this paper, laser-induced fluorescence spectroscopy was applied to obtain hydration structure of Eu(III) complexes with synthetic polycarboxylates of poly(acrylic acid, poly(maleic acid), poly(methacrylic acids), and poly(a-hydroxyacrylic acrylic acid).
Abstract: Laser-induced fluorescence spectroscopy was applied to obtaining hydration structure of Eu(III) complexes with synthetic polycarboxylates of poly(acrylic acid), poly(maleic acid), poly(methacrylic acid), and poly(a-hydroxyacrylic acid). Dependence of
$$N_{H_2 O} $$
(the number of water molecules in the first coordination sphere of Eu(III) ion) on pH and supporting electrolyte concentration was obtained for these complexes. The spectroscopic results show that Eu(III) is surrounded by the “cage” of polycarboxylate ligands. The pH-induced transition in conformation of poly(methacrylic acid) ligand was clearly observed in the
$$N_{H_2 O} $$
plot vs. pH.
12 citations
TL;DR: In this paper, the effect of ZnCl2 on the uptake of Be, Na, Mn, Co, Zn, Se, Rb, Cs, Sr, Mn and Co was investigated.
Abstract: The effect of ZnCl2 on the uptake of Be, Na, Mn, Co, Zn, Se, Rb, Sr, Rh, Cs and lanthanoids (Ce, Pm, Gd and Lu) by carrot (Daucas carota cv. U.S. harumakigosun) was investigated. Uptake was measured using a multitracer technique which enables to acquire information about various elements under identical conditions. The amount of uptake of Rb, Cs, Sr, Mn and Co, into roots decreased with increasing concentration of ZnCl2. On the other hand, little effect was observed for the uptake of Be, Se, Rh and lanthanoids. These results suggest that Rb, Cs, Sr, Mn and Co competed antagonistically with Zn for the binding sites of carriers in the roots, while there was no influence on the uptake of the other elements. Uptake of Se was not influenced by Cl added as ZnCl2. It is concluded, therefore, that carrot can distinguish Se from Cl based on the physicochemical differences between these two anion species.
5 citations