We present new imaging data on the ultracompact H ii region G45.45+0.06 at nearand mid-infrared wavelengths. High-resolution data were taken in the H and K ′ bands using ESO’s adaptive optics system ADONIS. The resulting images with a generic resolution of 0. ′′4 for the first time allow the resolution of the object into several single point-like sources. Additionally, we present images obtaine...

Organic-inorganic hybrid heterojunctions have potential as the basis for future photovoltaic devices. Herein, we report the results of investigations exploring the possibility of using pentacene and tetracene as photoelectron donors in conjunction with PbS nanocrystals (PbS-NCs). Photoinduced charge transfer was probed using external quantum efficiency measurements on acene:PbS-NC hybrid photov...

Enantioenriched secondary allylic carbamates have been deprotonated with sBuLi and reacted with boronic esters. In contrast to other electrophiles, high α-selectivity was observed and the boronate complexes were formed with almost complete retention of stereochemistry. The boronate complexes underwent a stereospecific 1,2-migration leading to tertiary allylic boronic esters with high er (>98:2)...

A new monoclinic polymorph of the title compound, C(8)H(12)N(4), in the space group P2(1)/n (Z = 4) is reported. The previously known form was also monoclinic, P2(1)/c (Z = 4), but the unit-cell parameters and crystal packing were different [Shoja & Saba (1993 ▶). Acta Cryst. C49, 354-355]. The hexa-hydro-pyrimidine ring of the title compound adopts a chair conformation with a diequatorial subs...

2 Ibid., 45, 136-144 (1959). 3 Weil-Malherbe, H., Biochem. J., 40, 351-363 (1946). 4 Isenberg, I., and A. Szent-Gyorgyi, PROC. NATL. ACAD. Sci., 44, 857-862 (1958). 5 Fujimori, E., PROC. NAT. ACAD. Sci., 45, 133-136 (1959). 6 Biochemisches Taschenbuch, ed. H. M. Rouen (Springer-Verlag, 1956). 7 Mason, S. F., Chapter in Ciba Foundation Symposium on Chemistry and Biology of Pteridines, ed. G. E. ...

1 : Head of the Rural Transformation and Sustainable Development Unit, Sahel and West Africa Club (SWAC/OECD), 2, rue André-Pascal, 75775 Paris, Cedex 16 ; Tel +33 1 45 24 19 82; e-mail: [email protected] 2 : Agricultural-economist, Rural Transformation and Sustainable Development Unit, Sahel and West Africa Club (SWAC/OECD), 2, rue André-Pascal, 75775 Paris, Cedex 16; Tel +33 1 45 24 ...