Photometric Study of W UMa Type Binaries in the Old Open Cluster Berkeley 39

The study of W UMa binary systems give a wealth of information about its nature as well as about its parent body (if any), like clusters. In this paper, we present the I passband photometric solutions of four W UMa binaries in the open cluster Berkeley 39 using the latest version of WD program. The result shows that, two binary systems are W subtype W UMa binary systems and another two systems are H subtype W UMa binary systems. No third body is found in any of the four systems. We found a correlation between the period and mass-ratio as well as temperature and mass-ratio for the respective variables which is similar to the relationship between mass ratio and total mass of the contact binaries as shown by vant Veer (1996) and Li et al. (2008).Comment: 8 pages, 2 figures, accepted for the publication in RA

Effect of noise on bathymetric side scan profiling sonar system resolution.

LD:D49067/84 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Immunomodulation of mice blood cells following treatment with free extract of Lactobacillus acidophilus cell

A study aimed to examine immunomodulatory effect of concentrated cell free filtrate (CCF) of Lactobacillus acidophilus on immune system of mice by detecting the total and absolute counts of leucocytes. It was shown that CCF of Lactobacillus acidophilus caused a significant increase in total leucocyte count for all concentrations used in comparison with negative control. However, in absolute leucocyte counts the, CCF of L.acidophilus at doses (500 , 750) mg/kg caused a significant increased in lymphocyte, neutrophil and monocyte counts, while there was no significant differences in eosinophils and basophil cells number of mice treated with bacterial filtrate. The interaction study showed that the post-treatment with CCF of L. acidophilus caused a significant increase in total leucocytes count and absolute counts of all types of leucocyte cells except basophils and esinophils which showed no significant differences in comparison with pre-treatmen

The Effect of Lactobacillus acidophilus cell free extract on micronuclei in white male mice

This study dealt with the effect of Lactobacillus acidophilus concentrated filtrate on polychromatic erythrocyte. The result showed that Lactobacillus acidophilus concentrated filtrate caused a non significant decrease in micronucleus formation at first dose in comparison with negative control while a significant decrease in micronucleus formation was shown in albino male mice at second and third doses in comparison with negative and positive controls. The result of post-treatment by concentrated filtrate also caused a significant decrease in micronucleus formation while the pre-treatment caused non significant decrease in the micronucleus formation in comparison with the corresponding control

Evidence for a Black Hole in the X-ray transient GS 1354-64 (=BW Cir)

We present the first radial velocity curve of the companion star to BW Cir which demonstrates the presence of a black hole in this X-ray transient which recorded outbursts in 1987 and 1997 (and possibly 1971-2). We identify weak absorption features corresponding to a G0-5III donor star, strongly veiled by a residual accretion disc which contributes 61-65 % of the total light at lambda 6300. The Doppler motions of these features trace an orbit of P=2.54448 days (or its 1-yr alias of P=2.56358 days) and velocity semi-amplitude K2=279 +- 5 km/s (or K2=292 +- 5 km/s). Both solutions are equally possible. The mass function implied by the shorter period solution is f(M)= 5.75 +- 0.30 Msun which, combined with the rotational broadening of the tidally locked companion (V sin i =71 +- 4 km/s), yields a compact object mass of M1 sin3 i = 7.34 +- 0.46 Msun. This is substantially above the mass of a neutron star under any standard equation of state of nuclear matter. The companion star is probably a G subgiant which has evolved off the main sequence in order to fill its Roche lobe. Remarkably, a distance of > 27 kpc is inferred by the companion's luminosity and this is supported by the large observed systemic velocity (gamma = 103 +- 4 km/s) which requires such a distance in order to be consistent with the Galactic rotation curve.Comment: 5 pages, 4 figures; accepted for publication in the Astrophysical Journal Letter