Non-linear rheology of active particle suspensions: Insights from an analytical approach

We consider active suspensions in the isotropic phase subjected to a shear flow. Using a set of extended hydrodynamic equations we derive a variety of {\em analytical} expressions for rheological quantities such as shear viscosity and normal stress differences. In agreement to full-blown numerical calculations and experiments we find a shear thickening or -thinning behaviour depending on whether the particles are contractile or extensile. Moreover, our analytical approach predicts that the normal stress differences can change their sign in contrast to passive suspensions.Comment: 11 pages, 10 figures, appear in PR

N-(4-Methyl­benzo­yl)-4-nitro­benzene­sulfonamide

In the title compound, C14H12N2O5S, the dihedral angle between the nitro­phenyl group and the –S—NH—C—O fragment is 80.74 (17)° and that between the nitro­phenyl and methyl­phenyl groups is 87.66 (14)°. The C—S—N—C torsion angle at the S—N bond is −67.0 (3)°. In the crystal, mol­ecules are linked into C(4) chains via N—H⋯O hydrogen bonds

Anti-colorectal cancer activity of an organometallic osmium arene azopyridine complex

This first in vivo antitumour activity for an organometallic osmium arene complex, [Os(eta(6)-p-cym)(4-(2-pyridylazo)-N,N-dimethylaniline)I]PF(6), is reported. The complex delays the growth of HCT116 human colon cancer xenografts in mice, with negligible toxicity. Its activity appears to involve redox mechanisms and its potency towards A2780 ovarian and A549 lung cancer cells is increased significantly in combination with L-buthionine-sulfoximine

The assembly history of the nearest S0 galaxy NGC 3115 from its kinematics out to six half-light radii

Using new and archival data, we study the kinematic properties of the nearest field S0 galaxy, NGC 3115, out to $\sim6.5$ half-light radii ($R_\mathrm{e}$) from its stars (integrated starlight), globular clusters (GCs) and planetary nebulae (PNe). We find evidence of three kinematic regions with an inner transition at $\sim0.2\ R_\mathrm{e}$ from a dispersion-dominated bulge ($V_\mathrm{rot}/\sigma <1$) to a fast-rotating disk ($V_\mathrm{rot}/\sigma >1$), and then an additional transition from the disk to a slowly rotating spheroid at $\sim2-2.5\, R_\mathrm{e}$, as traced by the red GCs and PNe (and possibly by the blue GCs beyond $\sim5\, R_\mathrm{e}$). From comparison with simulations, we propose an assembly history in which the original progenitor spiral galaxy undergoes a gas-rich minor merger that results in the embedded kinematically cold disk that we see today in NGC 3115. At a later stage, dwarf galaxies, in mini mergers (mass-ratio $<$ 1:10), were accreted building-up the outer slowly rotating spheroid, with the central disk kinematics largely unaltered. Additionally, we report new spectroscopic observations of a sample of ultra-compact dwarfs (UCDs) around NGC 3115 with the Keck/KCWI instrument. We find that five UCDs are inconsistent with the general rotation field of the GCs, suggesting an \textit{ex-situ} origin for these objects, i.e. perhaps the remnants of tidally stripped dwarfs. A further seven UCDs follow the GC rotation pattern, suggesting an \textit{in-situ} origin and, possibly a GC-like nature.Comment: 22 pages (including 3 pages of Appendix material), 14 figures, published in MNRA

N,N′-Bis(phenyl­sulfon­yl)maleamide

Mol­ecules of the title compound, C16H14N2O6S2, show crystallographic inversion symmetry: there is one half-mol­ecule in the asymmetric unit. The structure exhibits both intramolecular and inter­molecular N—H⋯O hydrogen bonds

N-Benzo­ylbenzene­sulfonamide

In the crystal structure of the title compound, C13H11NO3S, the conformation of the N—H bond in the C—SO2—NH—C(O)—C segment is anti to the C=O bond. The molecule is twisted at theN atom with a dihedral angle of 86.5(1)° between the sulfonyl benzene ring and the —SO2—NH—C=O segment. Furthermore, the dihedral angle between the two benzene rings is 80.3(1)°. The crystal structure features inversion-related dimers linked by pairs of N—H⋯O(S) hydrogen bonds

2,2,2-Tribromo-N-(4-chloro­phen­yl)acetamide

The crystal structure of the title compound, C8H5Br3ClNO, shows both intra­molecular N—H⋯Br and inter­molecular N—H⋯O hydrogen bonding. In the crystal, the mol­ecules are packed into column-like chains in the c-axis direction via the N—H⋯O hydrogen bonds

2,2,2-Tribromo-N-(3-chloro­phen­yl)acetamide

In the title compound, C8H5Br3ClNO, the conformation of the N—H bond is anti to the 3-chloro substituent in the benzene ring. An intra­molecular N—H⋯Br hydrogen bond occurs. In the crystal, mol­ecules are packed into infinite chains in the a-axis direction by N—H⋯O hydrogen bonds

2,2,2-Tribromo-N-phenyl­acetamide

In the title compound, C8H6Br3NO, the N—H bond is anti to the carbonyl bond in the side chain. The N—H hydrogen atom is involved in a two-centered bond as it shows simultaneous N—H⋯Br intra- and N—H⋯O inter­molecular inter­actions in the structure. In the crystal, mol­ecules are packed into column-like chains along the b axis through the N—H⋯O hydrogen bonds