The goal of present work was to investigate the use of bioerodible polymeric nanoparticles as carriers of retinoic acid (RA), which is known to induce differentiation of several cell lines into neurons. A novel method, named "Colloidal-Coating", has been developed for the preparation of nanoparticles based on a copolymer of maleic anhydride and butyl vinyl ether (VAM41) loaded with RA. Nanopart...

A novel potentiometric solid-state reference electrode containing single-walled carbon nanotubes as the transducer layer between a polyacrylate membrane and the conductor is reported here. Single-walled carbon nanotubes act as an efficient transducer of the constant potentiometric signal originating from the reference membrane containing the Ag/AgCl/Cl(-) ions system, and they are needed to obt...

The photochemical and electrochemical investigations of commercially available, safe, and cheap fluorescent brighteners, namely, triazinylstilbene (commercial name: fluorescent brightener 28) and 2,5-bis(5-tert-butyl-benzoxazol-2-yl)thiophene, as well as their original use as photoinitiators of polymerization upon light emitting diode (LED) irradiation are reported. Remarkably, their excellent ...

damage and fistula formation are known to occur (13). Formation of spinal arteriovenous fistulas (AVF) also has been reported as a delayed complication developing after lumbar surgery (3). We experienced spinal dural/epidural AVFs that developed at the site of previous lumbar surgery and successfully treated it with n-butyl cyanoacrylate (Histoacryl, B.Braun, Melsungen, Germany). To our knowled...

Microscale pumps that are simultaneously capable of turning “on” in response to specific analytes in solution and of providing precise control over flow rate will be needed for certain types of smart microand nanoscale devices. Access to these types of pumps, however, has remained limited. Two general approaches for designing microscale pumps have been proposed: 1) those that are turned on and ...

A series of dye-sensitized solar cells (DSCs) was constructed with TiO2 nanoparticles and N719 dye. The standard I3(-)/I(-) redox shuttle and the Co(1,10-phenanthroline)3(3+/2+) shuttle were employed. DSCs were modified with atomic-layered-deposited (ALD) coatings of Al2O3 and/or with the surface-adsorbing additive 4-tert-butyl-pyridine. Current-voltage data were collected to ascertain the infl...

Addition of an excess of t-butyl isocyanide to solid Mo2 (0, CCF3 )4 or MO?_ (0, CMe)4 gives (t-BuNC), Mo(Oz CCF3 )* or (t-BuNC), Mo(Oz CMe), , respectively. The quadruple bond in K4 MO* Cl8 or Cl4 MO, (n-Bus P)4 also can be cleaved by an excess of t-butyl isocyanide to yield (t-BuNC), MoCl, _ The anionic ligands can be exchanged with ammonium hexafluorophosphate in presence of excess t-BuNC to...

We report a case of pseudoaneurysm of the anterior ascending branch of the left pulmonary artery, following a left upper lobectomy for pulmonary aspergillosis, for which we have done an endovascular treatment. This is the first case where complete pseudoaneurysm occlusion was accomplished after a transcatheter intra-aneurysmal N-butyl 2-cyanoacrylate (glue) injection.

Steffen Runge, M athias O. Senge* Institut für Organische Chemie (WE02), Fachbereich Chemie, Freie Universität Berlin, Takustraße 3, D-14195 Berlin, Germany Z. Naturforsch. 53b, 1021-1030 (1998); received June 15, 1998 Porphyrins, Quinones, Electron Transfer Compounds, Crystal Structure, Conformation A series of 5-(benzoquinone)-10,15,20-trialkylporphyrins was synthesized via cross conden­ sati...

Cyanoacrylate glues are easily applied to wounds with good cosmetic results. However, they tend to be brittle and can induce local tissue toxicity. A series of cyanoacrylate monomers with a flexible ether linkage and varying side-chain lengths was synthesized and characterized for potential use as tissue adhesives. The effect of side-chain length on synthesis yield, physical and mechanical prop...