1-(2-Bromo­ethyl)-1,4-diazo­niabicyclo­[2.2.2]octane bromide tetra­fluoro­borate

In the crystal of the title compound, C8H17BrN2 2+·Br−·BF4 −, a weak inter­molecular N—H⋯Br hydrogen bond is observed between the cation and the bromide anion. A two-part disorder model was applied to the BF4 − anion with a refined major–minor occupancy ratio of 0.837 (14):0.163 (14)

1-(2-Bromo­ethyl)-1,4-diazo­niabicyclo­[2.2.2]octane bromide dihydrogen phosphate–phospho­ric acid (1/1)

In the crystal structure of the title compound, C8H17BrN2 2+·Br−·H2PO4 −·H3PO4, the cations, anions and phospho­ric acid mol­ecules are linked by O—H⋯O, N—H⋯O and O—H⋯Br hydrogen bonds into layers parallel to (101)

Geometric bionics: Lotus effect helps polystyrene nanotube films get good blood compatibility

Various biomaterials have been widely used for manufacturing biomedical applications including artificial organs, medical devices and disposable clinical apparatus, such as vascular prostheses, blood pumps, artificial kidney, artificial hearts, dialyzers and plasma separators, which could be used in contact with blood^1^. However, the research tasks of improving hemocompatibility of biomaterials have been carrying out with the development of biomedical requirements^2^. Since the interactions that lead to surface-induced thrombosis occurring at the blood-biomaterial interface become a reason of familiar current complications with grafts therapy, improvement of the blood compatibility of artificial polymer surfaces is, therefore a major issue in biomaterials science^3^. After decades of focused research, various approaches of modifying biomaterial surfaces through chemical or biochemical methods to improve their hemocompatibility were obtained^1^. In this article, we report that polystyrene nanotube films with morphology similar to the papilla on lotus leaf can be used as blood-contacted biomaterials by virtue of Lotus effect^4^. Clearly, this idea, resulting from geometric bionics that mimicking the structure design of lotus leaf, is very novel technique for preparation of hemocompatible biomaterials

STEADY-STATE ANALYSIS OF THE GI/M/1 QUEUE WITH MULTIPLE VACATIONS AND SET-UP TIME

In this paper, we consider a GI/M/1 queueing model with multiple vacations and set-up time. We derive the distribution and the generating function and the stochastic decomposition of the steady-state queue length, meanwhile, we get the waiting time distributions. Key words: multiple vacations, set-up time, stochastic decompositio

N-[(2S)-4-Chloro-2-(l-menth­yloxy)-5-oxo-2,5-dihydro­furan-3-yl]-l-valine

The title compound, C19H30ClNO5, was obtained by the tandem asymmetric Michael addition–elimination reaction of (5S)-3,4-dichloro-5-(l-menth­yloxy)furan-2(5H)-one and l-valine in the presence of potassium hydroxide. The furan­one unit is approximately planar (r.m.s. deviation = 0.0204 Å) and the six-membered cyclo­hexane ring adopts a chair conformation. The crystal structure is stabilized by a network of O—H⋯O and N—H⋯O hydrogen bonds

‘Wanheibao’: A new polyploid late-season table grape with muscat flavor

Research Not