Sôbre o desenvolvimento das ostras e possibilidades da ostreicultura nos arredores de Santos

Studies on wild oyster populations in the Santos region were started in March 1960, and in September of the same year work was begun on experimental culture. Several natural beds were found, the majority in the Bertioga Canal. Both the observations of wild populations and the experiments showed that the Canal is the most favorable location for oyster development. It was possible in the experimental work to show that both growth and survival rates are much higher there than they are in waters of higher salinity. Also the yield of meat per unit weight is higher in the Canal; about 1.5 g per centimeter of total length at the commercial size of approximately 8 cm. Two extended periods of fixation were found in the Canal, one in summer and the other from the end of winter through spring, although in the bay the fixation was practically year round. These results indicate good possibilities for a commercial oyster-culture industry. However, a bacteriological analysis of oysters from Canal beds showed coliform bacteria, so that provisions for purification should be made in any plans for development of oyster culture

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum