Circularization of late-type main-sequence binaries is usually attributed to turbulent convection, while that of early-type binaries is explained by resonant excitation of g modes. We show that the latter mechanism operates in solar-type stars also and is at least as eeective as convection, despite ineecient damping of g modes in the radiative core. The maximum period at which this mechanism ca...

A possible sound origin for the photospheric oscillations in the X–ray bursting sources 1608-522 and 2127+119 is suggested. It is shown that standing sound waves in an expanding spherical envelope can have periods very close to the observed ones. The quite large ratio, ∼ 10, of the periods in the two sources is explained in terms of different wave regimes. The relevance of sound oscillations to...

We present spectra of three M subdwarfs which are common proper motion companions to F or G subdwarfs of known metallicity. The assumption that the companions have the same composition allows us to test the Gizis (1997, AJ, 113, 806) M subdwarf classification system and its correspondence to metallicity. The results are in excellent agreement with the Gizis (1997) scale, thereby showing that th...

Heart failure is a chronic, progressive disease in which the overexpression of biologically active molecules and neurohomonal activation are the key factors of the evolution and natural history. The apelin-APJ system is a newly discovered molecular pathway and the RAAS counterbalance is its principal effect. The apelin is a potent inotrope, vasodilator and diuretic with crucial cardioprotective...

We demonstrate that generically an accretion disk around a compact object could have a new type of instability in that the accretion flow need not be symmetric with respect to the equatorial plane even when matter is supplied symmetrically farther out. We find that this behaviour is mainly due to interaction of outgoing matter bounced off the centrifugal barrier and the incoming accretion. We b...

OVER THE PAST 30 YEARS, THERE has been considerable interest in the elucidation of factors that mediate angiogenesis. These efforts led to the identification of factors such as vascular endothelial growth factor (VEGF), acidic and basic fibroblast growth factor (FGF-1 and -2), and angiopoietins, to name a few. Subsequent detailed investigations have revealed that finely tuned and precisely coor...

In a recent letter (ApJ 517, L155) Lenz et al. have shown the evidence of uniform temperature along steady long coronal loops observed by TRACE in two diierent pass-bands (171 A and 195 A lters). We propose that such an evidence can be explained by the sub-arcsecond structuring of the loops across the magnetic eld lines. In this perspective , we present a model of a bundle of six thin parallel ...