at -78 "C for 4 h. To the mixture was added a solution of compound 14 (5.0 mmol) and AlCl, (5.0 mmol) in CH2C12 (15 mL) dropwise. The mixture was stirred at -78 "C for 4 h and allowed to warm to room temperature. The mixture was hydrolyzed with water and extracted three times with ether. The ether phase was washed with brine, dried (MgSO,), and filtered. The filtrate was evaporated and the resi...

Context. Classical novae are quite frequent in M 31. However, very few spectra of M31 novae have been studied to date, especially during the early decline phase. Aims. Our aim is to study the photometric and spectral evolution of a M 31 nova event close to outburst. Methods. Here, we present photometric and spectroscopic observations of M31N 2005-09c, a classical nova in the disk of M 31, using...

We report spectroscopic observations of the nova M31N-2007-06b, which was found to be spatially coincident with the M31 globular cluster Bol 111. This nova is the first out of more than 700 discovered in M31 over the past century to be associated with one of the galaxy’s globular clusters. A total of three spectra of the nova were obtained 3, 6, and 36 days post discovery. The data reveal broad...

multiple sclerosis (ms) is an autoimmune disease of central nervous system. since different types of immune cells are involved in ms pathogenesis, in this study we aimed to evaluate serum levels of several immunological components including soluble cd4 (scd4), scd8, scd163, and immunoglobulins as markers of activity of t-cells, macrophages, and b-cells in different types of ms. serum levels of ...