Running Gluon Mass from Landau Gauge Lattice QCD Propagator

The interpretation of the Landau gauge lattice gluon propagator as a massive type bosonic propagator is investigated. Three different scenarios are discussed: i) an infrared constant gluon mass; ii) an ultraviolet constant gluon mass; iii) a momentum dependent mass. We find that the infrared data can be associated with a massive propagator up to momenta $\sim 500$ MeV, with a constant gluon mass of 723(11) MeV, if one excludes the zero momentum gluon propagator from the analysis, or 648(7) MeV, if the zero momentum gluon propagator is included in the data sets. The ultraviolet lattice data is not compatible with a massive type propagator with a constant mass. The scenario of a momentum dependent gluon mass gives a decreasing mass with the momentum, which vanishes in the deep ultraviolet region. Furthermore, we show that the functional forms used to describe the decoupling like solution of the Dyson-Schwinger equations are compatible with the lattice data with similar mass scales.Comment: Version to appear in J. Phys. G. New version include some rewriting and new analysis. In particular, the section on the running mass is ne

Scaling Invariance in a Time-Dependent Elliptical Billiard

We study some dynamical properties of a classical time-dependent elliptical billiard. We consider periodically moving boundary and collisions between the particle and the boundary are assumed to be elastic. Our results confirm that although the static elliptical billiard is an integrable system, after to introduce time-dependent perturbation on the boundary the unlimited energy growth is observed. The behaviour of the average velocity is described using scaling arguments

Elaboração e edição de bases carto-temáticas em ambiente SIG.

Resumo

Nemo through the looking-glass: a commentary on Desjardins & Fernald

info:eu-repo/semantics/publishedVersio

Social modulation of sex steroid concentrations in the urine of male cichlid fish Oreochromis mossambicus

The relationship between urinary concentrations (free + sulfates + glucuronides) of the steroids testosterone (T), 11-ketotestosterone (11KT), 17α, 20ß-dihydroxy-4-preg- nen-3-one (17,20ß-P) and 17a,20a-dihydroxy-4-preg- nen-3-one (17,20α-P), and the social behavior of males of the cichlid fish Oreochromis mossambicus was inves- tigated. After 8 days of isolation none of the steroids were good predictors of social dominance developed after subsequent formation of all-male groups. One day after group formation dominance indexes were good predictors of the urine concentrations of all sex steroids. Dominance indexes and androgen concentrations mea- sured after all-male group formation were positively cor- related with territoriality, courtship rate, and nest size. Similar relationships were found for progestins with the exception that they were not correlated with courtship rate. All-male group formation was also accompanied by an increase in urinary sex steroid concentrations in fish that became territorial and a decrease in non-territorial fish with the exception of T, which increased in both groups. Addition of ovulating females caused steroid concentrations to return to levels near isolation, except for 17,20α-P in territorials, which underwent a large in- crease. Thus, social interactions may have an important modulatory effect on sex steroid concentrations in O. mossambicus

Utilização do whiteside modificado e California Mastitis Test no diagnóstico da mastite subclínica em búfalas e sua relação com o exame microbiológico.

Foram avaliadas a sensibilidade e a especificidade dos testes California Mastitis Test (CMT) e Whiteside Modificado (WM) como métodos auxiliares no diagnóstico da mastite subclínica em búfalas do Estado de Pernambuco. Estabeleceu-se, também, uma relação entre o estágio e o número de lactações frente à infecção da glândula mamária e a participação dos agentes etiológicos na enfermidade. Foram analisadas 196 amostras de leite procedentes de 49 búfalas em cinco propriedades rurais da Zona da Mata Sul. Destas, 139 (70,9%) amostras foram positivas ao exame microbiológico, isolando-se 76 (55%) amostras de Staphylococcus spp, sendo 18 (13%) de Staphylococcus coagulase positiva e 58 (42%) Staphylococcus coagulase negativa. Isolaram-se também 25 amostras de bastonetes (18%) Gram negativos, oito de (6%) Streptococcus spp e três (2,2%) de Micrococcus spp em culturas puras ou em associação, além de 45 amostras (32,4%) de Bacillus spp. A análise dos testes CMT e WM demonstraram baixa sensibilidade e especificidade quando comparados ao isolamento bacteriano. O número e o estágio da lactação não influenciaram no aparecimento da infecção na glândula mamária desta espécie. ABSTRACT - One hundred and ninety six buffalo milk samples were analyzed from farms in the South region of Pernambuco State, Brazil. The sensibility and specificity of the California Mastitis Test (CMT) and the Modified Whiteside were studied as auxiliary methods in the diagnosis of subclinical mastitis. A relationship between the stage and the number of lactations regarding mammary infection was established. One hundred and thirty nine (70,9%) samples were positive in the microbiological exam, resulting in 76 samples of Staphylococcus spp. Fifty eight samples (42%) were classified as coagulase negative Staphylococcus. Other bacterias isolated were Bacillus spp (45/32,4%), Gram negative bacillus (25/18%), Streptococcus spp (8/6%) and Micrococcus spp (3/2,2%) in pure or mixed culture. The CMT and WM analysis showed low sensibility and specificity when compared to bacterial isolation. The number and stage of lactations did not influence on occurrence of the infection in the mammary gland of this species