Editorial: Clark, T.: Paul von Ragué Schleyer 75th birthday Festschrift.- Original Papers: Slootweg, J.C.; Ehlers, A.W., Lammertsma, K: Valence isomerization of 2-phospha-4-silabicyclo[1.1.0] butane.-.: a high-level ab initio study.- Wu, H.-S.; Cui, X.-Y.; Qin, X.-F.: Boron nitride cages from B12N12 to B36N36: square-hexagon.- Strout, D. L.; Jiao, H.: alternants vs boron nitride tubes.- Calvete, M.J.F.; Dini, D. Hanack, M.; Sancho-García, J.C.; Chen, W.; Ji W.: Synthesis, DFT calculations, linear and nonlinear optical properties of binuclear phthalocyanine gallium chloride.- Zhang, F.-Q.; Wu, H.-S.; Xu, Y.-Y.; Li, Y.-W.; Jiao, H.: Structure and stability of neutral polyoxometalate cages (Mo2O6)m (m=1-13).- Rasul, G.; Prakash, G.K.S.; Olah, G.A.: Theoretical study of AIH2+n (n=1-7) dications.- Bickelhaupt, F.M.; Solà, M.; Fonseca Guerra, C.: Structure and bonding of methyl alkali metal molecules.- Alexandrova, A.N.; Koyle, E.; Boldyrev, A.I.: Theoretical study of hydrogenation of the doubly aromatic B7¯ cluster.- Subramanian, G.; Kitchen, D.B.: Computational approaches for modeling human intestinal absorption and permeability.- Goldfuss, B.; Schumacher, M.: Umpolung catalysts: comparative assessments on reactivities.- Kiani, F.A.; Hofmann, M.: Periodic trends and easy estimation of relative stabilities in 11-vertex nido-p-block-heteroboranes and -borates.- Sieg, S.; Stutz, B.; Schmidt, T.; Hamprecht, F.; Maier, W.F.: A QCAR-approach to materials modeling.- Alex, A.; Hänsele, E.; Clark, T.: The ethylene/metal(0) and ethylene/metal(I) redox system: model ab initio calculations.- Chiappe, C.; Pomelli, C.S.; Lenoir, D.; Wattenbach, C.: The first intermediates in the bromination of bicyclo[3.3.1] nonylidenebicyclo[3.3.1]nonane, combination of experiments and theoretical results .- Biswas, P.K.; Niu, J.; Frederico, T.; Gogonea, V.: Numerical simulation and graphical analysis of in vitro benign tumor growth: application of single-particle state bosonicmatter equation with length scaling.- Alder, R.W.; Davis, A.P.: The design of organic catalysis for epoxidation by hydrogen peroxide.- Brown, C.A.; McKee, M.L.: Rearrangements in icosahedral boranes and carboranes revisited.- Mo, Y. Probing the nature of hydrogen bonds in DNA base pairs.- Streitwieser, A. Ion pair aggregates and reactions; experiment and theory.- Xiao, Y.; Jung, D.; Gund, T.; Malhotra, S.V.: An experimental and theoretical study of the enantioselective deprotonation of cyclohexene oxide with isopinocampheyl-based chiral lithium amides Salzner, U.; Karalti, O.; Durdagi, S.: Does the donor-acceptor concept work for designing synthetic metals? III. Theoretical investigation of copolymers between quinoid acceptors and aromatic donors.- Setzer, W.N.; Rozmus, G.F.; Setzer, M.C.; Schmidt, J.M.; Vogler, B.; Reeb, S.; Jackes, B.R.; Irvine, A.K.: Bioactive principles in the bark of Pilidiostigma tropicum.- Weingart, O.; Schapiro, I.; Buss V.: Bond torsion affects the product distribution in the photoreaction of retinal model chromophores.- Koch, R.; Bruhn, T.: Theoretical 49Ti NMR chemical shifts.- Glaser, R.; Wu, H.; von Saint Paul, F.: Chemical carcinogens in non-enzymatic cytosine deamination: 3-isocyanatoacrylonitrile.- Puchta, R.; Clark, T.; Bauer, W. The formation of endo-complexes between calixarenes and amines - a reinvestigation