Criação de peixes pode ser uma boa alternativa de negócio para o produtor rural brasileiro.

Há mais de 20 anos, a criação de peixes vem se apresentando como uma promissora oportunidade econômica para o empresário rural brasileiro. No início, estimulada pela expansão dos ?pesque-pagues?, a atividade mostrou-se muito lucrativa, permitindo à piscicultura experimentar um crescimento até então inédito no País. Os brasileiros começavam a perceber que os peixes poderiam ser produzidos em cativeiro, sob condições controladas e planejadas, diferentemente da tradicional pesca extrativista. A perspectiva de aumentar o consumo de um alimento nobre passou a fazer parte do dia a dia da população e o setor produtivo percebeu uma excelente alternativa de negócio.bitstream/item/123119/1/Criacao-de-peixes.pd

Qualidade da água na engorda de tambaqui em viveiros sem renovação da água.

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Radiographic fetal osteometry: Approach on age estimation for the portuguese population

The estimation of gestational age (GA) on fetal remains can be an important forensic issue. Forensic specialists usually use reference tables and regression equations derived from reference collections, which are quite rare in what fetuses are concerned. Since these tools are mostly grounded on ultrasonographic measurements, which are known to differ from real bones measurements or are based on ancient literature, this study aimed the construction of tables and regression equations for the Portuguese population on the basis of diaphyseal bone length measurements (femur, tibia and humerus) of 100 fetuses of known GA, using post-mortem radiographs. There is a strong correlation between the longitudinal length of studied bones and GA; the femur exhibits the strongest correlation (r = 0.969; p = 0.000), followed by the tibia (r = 0.966; p = 0.000) and the humerus (r = 0.963; p = 0.000). Therefore it was possible to obtain regression equations and to build tables with reference values for each of the diaphysis analyzed

Protocolo para criopreservação do sêmen de tambaqui (Colossoma macropomum).

bitstream/item/39781/1/cot-112.pd

Is the H0H_0 tension suggesting a 4th neutrino's generation?

Flavour oscillations experiments are suggesting the existence of a sterile, $4$th neutrino's generation with a mass of an eV order. This would mean an additional relativistic degree of freedom in the cosmic inventory, in contradiction with recent results from the Planck satellite, that have confirmed the standard value $N_{eff} \approx 3$ for the effective number of relativistic species. On the other hand, the Planck best-fit for the Hubble-Lema\^itre parameter is in tension with the local value determined with the Hubble Space Telescope, and adjusting $N_{eff}$ is a possible way to overcome such a tension. In this paper we perform a joint analysis of three complementary cosmological distance rulers, namely the CMB acoustic scale measured by Planck, the BAO scale model-independently determined by Verde {\it et al.}, and luminosity distances measured with JLA and Pantheon SNe Ia surveys. Two Gaussian priors were imposed to the analysis, the local expansion rate measured by Riess {\it et al.}, and the baryon density parameter fixed from primordial nucleosynthesis by Cooke {\it et al.}. For the sake of generality, two different models are used in the tests, the standard $\Lambda$CDM model and a generalised Chaplygin gas. The best-fit gives $N_{eff} \approx 4$ in both models, with a Chaplygin gas parameter slightly negative, $\alpha \approx -0.04$. The standard value $N_{eff} \approx 3$ is ruled out with $\approx 3\sigma$.Comment: includes some improvements in analysis, matches accepted version in PR

Endosperm genotyping as a strategy to differentiate the allele source in maize heterozygous progeny.

The objective of this work was to distinguish the parental source of alleles in heterozygous progeny using semiquantitative polymerase chain reaction (PCR) in maize endosperm. Endosperms derived from direct and reciprocal single-cross hybrids between maize inbred lines L3 and L1113-01 were genotyped by semiquantitative PCR methodology (SQ-PCR) using fluorescent microsatellite primers. The amplification products were evaluated by the ratios of fluorescence intensity (RFI), calculated between the peaks corresponding to the alleles derived from each parental line. Based on the statistically significant contrast between RFI mean values of direct and reciprocal single-cross hybrids, it was possible to distinguish the number of alleles received from each parental line and, ultimately, to determine the origin of the alleles of each cross. Thus, endosperm genotyping using SQ-PCR is a promising strategy to map QTL in maize outbred populations

Fisiologia do milho.

bitstream/CNPMS/15589/1/Circ_22.pd