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314655 documents, page 1 of 31466

Estrogen directly down-regulates the bone-resorbing activity of mature osteoclasts through nuclear estrogen receptor α

The decrease in estrogen level that follows the onset ofmenopause causes rapid bone loss, resulting in osteoporosis.However, the mechanism remains unclear, especially concerningthe regulation of bone-resorbing osteoclasts. Here we analyzedthe function of estrogen and its receptor in matureosteoclasts. We found that estrogen directly inhibitedbone-resorption by purified rabbit mature-osteoclasts.Moreover, using a RT-PCR technique, we report that nuclearestrogen receptor (ER) α but not ERβ is e...

The accretion/diffusion theory for lambda Bootis stars in the light of spectroscopic data

Most of the current theories suggest the lambda Bootis phenomenon to originate from an interaction between the stellar surface and its local environment. In this paper, we compare the abundance pattern of the lambda Bootis stars to that of the interstellar medium and find larger deficiencies for Mg, Si, Mn and Zn than in the interstellar medium. A comparison with metal poor post-AGB stars showing evidence for circumstellar material indicates a similar physical process possibly being at work f...

Mathematics of Structure-Function Equations of All Orders

Exact equations are derived that relate velocity structure functions of arbitrary order with other statistics. "Exact" means that no approximations are used except that the Navier-Stokes equation and incompressibility condition are assumed to be accurate. The exact equations are used to determine the structure-function equations of all orders for locally homogeneous but anisotropic turbulence as well as for the locally isotropic case. These equations can be used for investigating the approach...

Solitons in Non-Abelian Born-Infeld Theory

Born-Infeld generalization of the Yang-Mills action suggested by the superstring theory gives rise to modification of previously known as well as to some new classical soliton solutions. Earlier it was shown that within the model with the usual trace over the group generators classical glueballs exist which form an infinite sequence similar to the Bartnik-McKinnon family of the Einstein-Yang-Mills solutions. Here we give the generalization of this result to the 'realistic' model with the symm...

Charming penguin in nonleptonic B decays

In the study of two-body charmless B decays as a mean of looking for direct CP-violation and measuring the CKM mixing parameters in the Standard Model, the short-distance penguin contribution with its absorptive part generated by charm quark loop seems capable of producing sufficient $B \to K\pi$ decays rates, as obtained in factorization and QCD-improved factorization models. However there are also long-distance charming penguin contributions which also give rise to a strong phase due to the...

Revisiting W gamma production at RHIC

We discuss W gamma production in polarized p p collisions at RHIC energy. We point out that the RHIC collider has two advantages over other hadron colliders to measure the characteristic feature of W gamma production: (1) the RHIC energy is not so high and (2) the polarized beams are available. We calculate the tree level cross section for W gamma production using a generic spin basis for W and discuss both the angular dependence and spin correlation.

Pi and PiPi Decays of Excited D Mesons

The $\pi$ and $\pi\pi$ decay widths of the excited charm mesons are calculated using a Hamiltonian model within the framework of the covariant Blankenbecler-Sugar equation. The pion-light constituent quark coupling is described by the chiral pseudovector Lagrangian.

Supersymmetry and the Systematics of T-duality Rotations in Type-II Superstring Theories

We describe a systematic method of studying the action of the T-duality group O(d,d) on space-time fermions and R-R field strengths and potentials in type-II string theories, based on space-time supersymmetry. The formalism is then used to show that the couplings of non-Abelian D-brane charges to R-R potentials can be described by an appropriate Clifford multiplication.