Thickness and density of corneal endothelial cells in ovines

The cornea is transparent layer of the eye, transmission and refraction of light being their main functions. The endothelium, one of the cornea four layers, is a hexagonal unicellular layer that forms a barrier between the stroma and aqueous humor, obstructing the entrance of water and others solutes from the anterior chamber towards the stroma. In the regard to it, a minimum density of these cells is necessary to maintain the performance and clarity of the eye visual capacity. The main objective of the present research was the determination of the density of endothelial cells and their corneal thickness, using a noncontact specular microscope, in 22 eyes from 11 ovines. The average density of the endothelial corneal was 2726 cels/mm² and the thickness 654 µm. The males displayed a higher average density and a smaller cell area than the females.A córnea é transparente, sendo suas principais funções a transmissão e a refração da luz. Compreende quatro camadas, dentre elas, o endotélio corneano, que é constituído por uma única camada de células hexagonais interligadas, formando uma barreira entre o estroma corneano e o humor aquoso, limitando a entrada de água e solutos oriundos da câmara anterior para o estroma. Portanto, uma densidade mínima é necessária para manter a transparência e a funcionalidade corneanas. Objetivou-se determinar a densidade de células endoteliais e a espessura corneanas, utilizando-se microscopia especular de não contato, em 22 olhos provenientes de 11 ovinos. A média de densidade celular endotelial corneana foi de 2726 céls/mm2 e a espessura 654 µm. Os machos apresentaram médias de densidades superiores e áreas celulares inferiores em relação às fêmeas

Measurement of CP observables in B± → D(⁎)K± and B± → D(⁎)π± decays

Measurements of CP observables in B ± →D (⁎) K ± and B ± →D (⁎) π ± decays are presented, where D (⁎) indicates a neutral D or D ⁎ meson that is an admixture of D (⁎)0 and D¯ (⁎)0 states. Decays of the D ⁎ meson to the Dπ 0 and Dγ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the B candidate invariant mass distribution. Decays of the D meson are fully reconstructed in the K ± π ∓ , K + K − and π + π − final states. The analysis uses a sample of charged B mesons produced in pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb −1 taken at centre-of-mass energies of s=7, 8 and 13 TeV, respectively. The study of B ± →D ⁎ K ± and B ± →D ⁎ π ± decays using a partial reconstruction method is the first of its kind, while the measurement of B ± →DK ± and B ± →Dπ ± decays is an update of previous LHCb measurements. The B ± →DK ± results are the most precise to date