There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

J. Appl. Cryst.の発刊に際して

The applications of copper (Cu) and Cu-based nanoparticles, which are based on the earth-abundant and inexpensive copper metal, have generated a great deal of interest in recent years, especially in the field of catalysis. The possible modification of the chemical and physical properties of these nanoparticles using different synthetic strategies and conditions and/or via postsynthetic chemical treatments has been largely responsible for the rapid growth of interest in these nanomaterials and their applications in catalysis. In addition, the design and development of novel support and/or multimetallic systems (e.g., alloys, etc.) has also made significant contributions to the field. In this comprehensive review, we report different synthetic approaches to Cu and Cu-based nanoparticles (metallic copper, copper oxides, and hybrid copper nanostructures) and copper nanoparticles immobilized into or supported on various support materials (SiO2, magnetic support materials, etc.), along with their applications i...

http://pubs.acs.org/doi/pdfplus/10.1021/acs.chemrev.5b00482

Cu and Cu-Based Nanoparticles: Synthesis and Applications in Catalysis.

: The unpolarized absorption and circular dichroism spectra of the fundamental vibrational transitions of the chiral molecule, 4-methyl-2-oxetanone, are calculated ab initio. Harmonic force fields are obtained using Density Functional Theory (DFT), MP2, and SCF methodologies and a 5S4P2D/3S2P (TZ2P) basis set. DFT calculations use the Local Spin Density Approximation (LSDA), BLYP, and Becke3LYP (B3LYP) density functionals. Mid-IR spectra predicted using LSDA, BLYP, and B3LYP force fields are of significantly different quality, the B3LYP force field yielding spectra in clearly superior, and overall excellent, agreement with experiment. The MP2 force field yields spectra in slightly worse agreement with experiment than the B3LYP force field. The SCF force field yields spectra in poor agreement with experiment.The basis set dependence of B3LYP force fields is also explored: the 6-31G* and TZ2P basis sets give very similar results while the 3-21G basis set yields spectra in substantially worse agreements with experiment. jg

Ab initio calculation of vibrational absorption and circular dichroism spectra using density functional force fields

M r 908.43, monoclinic, C2/c, a = 16.551(9), b=11 .588 (2 ) , e =12 .521(5 ) A, f l= 99.12 (4) ° , V = 2 3 7 1 . 1 A 3, Z = 4 , D m=2.56(2) , D x = 2.544 Mg m -3, 2(Mo Ktx) = 0.7107 ,/k, g(Mo Ka) = 6.08 mm -~, F(000)= 1648, room temperature, R = 0.0668 for 2218 observed reflections. The palladium atom, which lies on the twofold axis, is planar four-coordinate ($2I 2 donor set) P d S = 2 . 2 9 3 (2), P d I = 2.606 (1)/~, with adjacent molecules linked by diiodine ( I . . . I I . . . I ) producing essentially linear 14 groups I . . . I = 3 . 5 6 3 (2), I I = 2 . 7 3 3 (2)/I,. The chelating dithioether has an anti conformation of the

http://journals.iucr.org/c/issues/1983/07/00/a22540/a22540.pdf

Structure of diiodo[1,2-bis(phenylthio)benzene]palladium(II) diiodine (1/1), [Pd(C18H14S2)I2]I2

The title compound, [Ce(C3H9OP)4(H2O)4]Cl3·3H2O, con­tains eight-coordinate Ce atoms in an approximate dodeca­hedral arrangement, with Ce—O(P) = 2.372 (2)–2.423 (2) A and Ce—O(H2) = 2.518 (2)–2.630 (2) A.

Tetraaquatetrakis(trimethylphosphine oxide-κO)cerium(III) trichloride trihydrate

Systematics of boron halide complexes with dichalcogenoether ligands – Synthesis, structures and reaction chemistry

X-ray crystal structures are reported for Na-6[RuO2{TeO4(OH)(2)}(2)] ? 16H(2)O and Na-5[Ag{TeO4(OH)(2)}(2)] ? 16H(2)O which contain respectively Ru-VI and Ag-III coordinated to chelating bidentate tellurate ([TeO4(OH)(2)](4-)) groups. Na-6[RuO2{TeO4(OH)(2)}(2)] ? 16H(2)O: Space group P(1) over bar, Z = 2. lattice dimensions at 120 K; a = 6.9865(1), b = 8.7196(2) c = 11.7395(2) Angstrom, alpha = 74.008(1), beta = 79.954(1), gamma = 88.514(1)degrees R1 = 0.025. Na-5[Ag{TeO4(OH)(2)}(2)] . 16H(2)O: Space group P(1) over bar. Z = 2, lattice dimensions at 120 K a = 5.888(1), b = 8.932(1), c = 12.561(2) Angstrom, alpha = 98.219(6), beta = 97.964(9), gamma = 93.238(14)degrees; R1 = 0.047.

William Levason

Papers

Structure of diiodo[1,2-bis(phenylthio)benzene]palladium(II) diiodine (1/1), [Pd(C18H14S2)I2]I2

Tetraaquatetrakis(trimethylphosphine oxide-κO)cerium(III) trichloride trihydrate

Systematics of boron halide complexes with dichalcogenoether ligands – Synthesis, structures and reaction chemistry

X‐Ray Crystal Structures of Hexa‐oxotellurate Complexes of Ruthenium(VI) and Silver(III): Na6[RuO2{TeO4(OH)2}2]·16H2O and Na5[Ag{TeO4(OH)2}2]·16H2O

Coordination chemistry of higher oxidation states Part 9 [1]. Nickel(III) complexes of monodentate phosphines and related ligands