Mesoporous amorphous and nanocrystalline titanium dioxide were prepared by simple and environmental friendly modified Sol-Gel method using cationic (C14TAB, C16TAB, C18TAB) and nonionic (Plantacare UP K55) surfactant as pore forming agent. The obtained particles were characterized by BET, TEM, FT-IR and XRD techniques. The effect of cationic surfactant chain...

The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C(14)TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt-C(14)TAB nanoparticles in N(2), H(2), and O(2) atmospheres leads to the release of the hydrocarbon chain of the surfactant and the formation of a strongly bonded layer ...

anderen Winkel ö (Tab. 2). Die an die Seiten b anschließenden Fünfecke sind gleichzeitig Dodeka­ ederflächen, während die an den Kanten c anschlie­ ßenden Fünfecke nur den Vierzehnflächnern zuge­ hören. In diesen Fünfecken findet man aneinander anschließend zweimal die Seite c mit einem einge­ schlossenen Winkel e. An beide schließen unter einem Winkel C die Seiten a an. Die Seite d ( = 2,319Ä ...

Po lynomia l t i m e complex i ty is the usual ' t h resho ld ' for d is t ingu ish ing the t rac tab le f r o m the in t rac tab le and i t may seem reasonable to adopt th is no t i on o f t rac tab i l i t y in the context o f knowledge representat ion and reasoning. I t is argued tha t do ing so may be inappropr ia te in the context of c o m m o n sense reasoning underl y i ng language under...

The development of humoral and cell-mediated immune responses to Salmonella typhi antigens and immunoglobulin and C(3) levels were determined in patients suffering from typhoid fever, TAB-vaccinated individuals, and appropriate controls. In 45 patients with typhoid, a significant elevation of immunoglobulin M (IgM) level was noted from the first week of illness onwards. Eighteen TAB-vaccinated ...

The c-erbB-2 gene encodes a M(r) 185,000 tyrosine kinase receptor (p185) with extensive homology to the epidermal growth factor receptor. We have conducted mechanistic studies with several anti-p185 monoclonal antibodies (TAb 250, -255, -257, -260, and -263) directed against the extracellular domain of p185 utilizing the SKBR-3, BT-474, and SKOV-3 cancer cell lines. Several of these antibodies ...

A monoclonal antibody (TAb 250) specific to an extracellular epitope of the c-erbB-2 protein (gp185) inhibited the in vitro proliferation of human breast tumor cell lines that overexpress c-erbB-2 in a dose-dependent manner. Treatment of cells with combinations of cis-diammedichloroplatinum (CDDP) and TAb 250 resulted in a significantly enhanced cytotoxic effect. This synergistic cytotoxicity w...