First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity (∆η) and the full range of relative azimuthal angle (∆φ). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (∆φ ≈ π) azimuthal correlation is observed at all ∆η, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in ∆η are observed for particles with similar φ values. This phenomenon, also known as the "ridge", persists up to at least |∆η| = 4. For particles with transverse momenta (p T ) of 2-4 GeV/c, the ridge is found to be most prominent when these particles are correlated with particles of p T = 2-6 GeV/c, and to be much reduced when paired with particles of p T = 10-12 GeV/c.

The relaxation of strain in compositionally step-graded In x Ga 1Ϫx As layers grown on GaAs͑001͒ has been examined with cathodoluminescence ͑CL͒ wavelength and linearly polarized imaging approaches. A polarization anisotropy in CL is found, and this correlates with spectral shifts in the peak positions of excitonic luminescence. Varying asymmetries in misfit dislocation densities from transmission electron microscopy are found to be consistent with the m-scale spatial variations in strain that is deduced from the CL. © 1995 American Institute of Physics.The interest in lattice-mismatched III-V semiconductor materials is driven, not only by the possibility of creating optoelectronic devices such as light modulators, lasers, and detectors with tunable energy sensitivity, but also by the possibility of integrating existing III-V devices with current Si technology. The approach is to create a defect-filtering buffer layer that is grown between the surface device structure and the substrate. Recent experiments with relatively thin ͑less than ϳ1 m thick͒ compositionally step-and linearly graded buffer layers have been successful in producing close to 100% relaxed layers with threading dislocation densities less than ϳ10 6 cm Ϫ2 . Such results have been reported for a variety of lattice-mismatched systems including Ge/Si, 1,2 In 0.5 Ga 0.5 As/GaAs, 3-5 and In 0.4 Ga 0.6 P/GaP. 6 However, with incomplete strain relaxation, such systems can exhibit an anisotropic in-plane strain relaxation as measured by multiplecrystal x-ray diffraction 5 and deduced from the nonuniform and anisotropic misfit dislocation densities that have been observed in plan-view transmission electron microscopy ͑TEM͒ studies. 7 In this letter, we have performed an examination of spatial variations in strain and alloy composition of a stepgraded In x Ga 1Ϫx As/GaAs buffer layer heterostructure using two new variations in the cathodoluminescence ͑CL͒ imaging technique. A unique combination of scanning linearly polarized CL ͑LPCL͒ 8 and CL wavelength imaging ͑CLWI͒ 9 measurements were performed. In CLWI, the wavelength ͓ m

Four-and-a-half LIM 2 (FHL2) is a member of a family of LIM domain proteins which mediate protein-protein interactions. FHL2 acts as a coactivator and binds to important regulators of bone formation such as insulin-like growth factor binding protein (IGFBP)-5, androgen receptor, and beta-catenin. We hypothesized that FHL2 is an important regulator of bone formation. We evaluated growth and skeletal parameters in FHL2 knockout (KO) and wild-type (WT) mice at 4, 8, and 12 weeks of age. At 4 weeks of age, lack of FHL2 reduced femur, tibia, and total bone mineral content (BMC) and body weight in all mice. A gender-by-treatment interaction (P

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