A simple and mild one-pot three-component reaction for the preparation 1,4-dihydropyridines has been developed from various aldehyde substrates, 1,3-dicarbonyl compounds (dimedone) and ammonium acetate (Hantzsch method) in the presence of a catalytic amount of phospho sulfonic acid (PSA) as an efficient and heterogeneous solid acid in EtOH at room temperature. Preparation of PSA is straightforw...

In this paper we present a lexicon-based approach to the problem of morphological processing. Fullform words, lemmas and grammatical tags are interconnected in a DAWG. Thus, the process of analysis/synthesis is reduced to a search in the graph, which is very fast and can be performed even if several pieces of information are missing from the input. The contents of the DAWG are updated using an ...

Introduction renal arteries. The proximal neck of the aneurysm was 24 mm long and 23 mm wide, without thrombus or Endoluminal repair of infrarenal aneurysms of the calcifications, and consequently fit for endovascular abdominal aorta is still controversial. Much unfixation (Fig. 2). Preoperative kidney function was certainty continues to exist about its proper application normal (urea: 5.5 mmol...

Carbonic anhydrase (CA) is an enzyme of high interest due to its implications relative the medical and environmental sectors. In current paper, assay for determination CA activity proposed it characterized by simplicity practicability. It permits straightforward comparison CAs performance in physiological conditions. The methodology theoretical background evaluation method are explained detail....