Spectroscopic study of proflavine adsorption on the carbon nanotube surface

The present paper sheds light on one of the possible mechanisms of interaction between the typical aromatic dye proflavine and the carbon nanotube surface, namely, π-stacking between aromatic rings of these compounds. To investigate such a complexation, a qualitative analysis was performed by means of ultraviolet visible, infrared, and nuclear magnetic resonance spectroscopy. The data obtained suggest that π-stacking brings the major contribution to the stabilization of the complex between proflavine and the carbon nanotub

Descriptions of three new species of Dzhanokmenia (Hymenoptera: Eulophidae) from China

Li, Qin, Wang, Chao, Hu, Hong-Ying, Kostjukov, Viktor V., Salle, John La, Zhu, Chao-Dong (2016): Descriptions of three new species of Dzhanokmenia (Hymenoptera: Eulophidae) from China. Zootaxa 4121 (4): 447-457, DOI: http://doi.org/10.11646/zootaxa.4121.4.

FIGURES 21–30. Dzhanokmenia gobica. 21–25 in Descriptions of three new species of Dzhanokmenia (Hymenoptera: Eulophidae) from China

FIGURES 21–30. Dzhanokmenia gobica. 21–25, female: 21, habitus (holotype), lateral; 22, head, frontal; 23, antenna, lateral; 24, mesosoma, dorsal; 25, wings. 26–30, male: 26, habitus, lateral; 27, head, frontal; 28, antenna, lateral; 29, mesosoma, dorsal; 30, wings. Scale bars: 0.2 mm

C60 fullerene aggregation in aqueous solution

In the present work we develop a novel approach for quantification of the energetics of C-60 fullerene aggregation in aqueous media in terms of equilibrium aggregation constant K-F. In particular, it is shown that the experimental determination of the magnitude of K-F is possible only within the framework of the 'up-scaled aggregation model', considering the C60 fullerene water solution as a solution of fullerene clusters. Using dynamic light scattering (DLS) data we report the value, K-F = 56 000 M-1, which is in good agreement with existing theoretical estimates and the results of energetic analyses. It is suggested that the proposed 'up-scaled model' may be used in any instances of non-specific aggregation resulting in formation of large spherical particles. The measurement of the translational diffusion coefficient and the dimensions of the light scattering particles using a DLS approach with respect to C-60 fullerene aggregates is found to contain significant systematic errors originating from the interaction effect that is well-known for micellar solutions. As a result, corrections to the equations associated with DLS data are proposed