Silica Vanadic Acid, SVA, (oxo-vanadium has been supported on silica) as a dual Lewis and Bronsted acid ability was prepared and efficiently catalyzed one-pot multi-component condensation of enolizable ketones or alkyl acetoacetates with aromatic aldehydes, acetonitrile and acetyl chloride. The described reaction was produced β-acetamido ketone or ester derivatives in high to excellent yields i...

We use Conley index theory to develop a general method used to prove existence of periodic and heteroclinic orbits in a singularly perturbed system of ODE’s. This is a continuation of the authors’ earlier work [9] which Supported by NSF Grant INT-0089631 and by JSPS Japan-U.S. Cooperative Science Program. Partially supported by NSF EIA-BITS grant 426411. Partially supported by Grant-in-Aid for ...

A novel gold nanoparticle supported periodic mesoporous organosilica with alkylimidazolium framework, Au@PMO-IL, was shown to be a highly active and recyclable catalyst for three-component coupling reaction of aldehyde, alkyne and amine to give the corresponding propargylamine.

We demonstrated an unprecedented example of Ullmann homocoupling reaction of aryl iodides over a novel recyclable gold catalyst comprising Au nanoparticles supported on a bifunctional periodic mesoporous organosilica (Au@PMO).

hantzsch 1,4-dihydropyridines are oxidized to the corresponding pyridine derivatives using oxygen or air and a mixture of the manganese and cobalt salts of parninobenzoic acid supported on silica gel as the catalysts. reactions are clean and the catalysts can be recovered easily and reused repeatedly.

By J. BURNS AND P. B. NEAME T lIE PERIODIC ACID-SCHIFF (PAS ) REACTION is generally accepted as the method of choice for demonstrating glycogen in blood cells. This reaction depends upon the presence, in glycogen, of vicinal glycols which are oxidized by periodic acid to dialdehydes. The latter are subsequently condensed with Schiff’s reagent to produce a magenta-red product, visible by light m...

We applied a periodic magnetic field of frequency 16 Hz and amplitude 16 nT to a human IKS channel, expressed in a Xenopus oocyte and varied the membrane depolarization between -100 mV and +100 mV. We observed a maximal increase of about 9% in the potassium current at membrane depolarization between 0 mV and 8 mV (see Figure 3). A similar measurement of the potassium current in the KCNQ1 channe...

Let f be a rational function such that the multipliers of all repelling periodic points are real. We prove that the Julia set of such a function belongs to a circle. Combining this with a result of Fatou we conclude that whenever J(f) belongs to a smooth curve, it also belongs to a circle. Then we discuss rational functions whose Julia sets belong to a circle. MSC classes: 37F10, 30D05. A simpl...