Confronting cold dark matter cosmologies with strong clustering of Lyman break galaxies at z∼3z\sim3

We perform a detailed analysis of the statistical significance of a concentration of Lyman break galaxies at $z \sim 3$ recently discovered by Steidel et al. (1997), using a series of N-body simulations with $N=256^3$ particles in a (100\himpc)^3 comoving box. While the observed number density of Lyman break galaxies at $z\sim3$ implies that they correspond to systems with dark matter halos of \simlt 10^{12}M_\odot, the resulting clustering of such objects on average is not strong enough to be reconciled with the concentration if it is fairly common; we predict one similar concentration approximately per ($6\sim 10$) fields in three representative cold dark matter models. Considering the current observational uncertainty of the frequency of such clustering at $z\sim3$, it would be premature to rule out the models, but the future spectroscopic surveys in a dozen fields could definitely challenge all the existing cosmological models a posteriori fitted to the $z=0$ universe.Comment: the final version which matchs that published in ApJ Letters (Feb 1998); compared with the previous versions, the predictions for the SCDM model are slightly changed; Latex, 11 pages, including 3 ps figure

Antibiotic susceptibility of enterococci isolated from traditional fermented meat products

Antibiotic susceptibility was evaluated for 182 Enterococcus spp. isolated from Alheira, Chouriça de Vinhais and Salpica˜o de Vinhais, fermented meat products produced in the North of Portugal. Previously, a choice was made from a group of 1060 isolates, using phenotypic and genotypic tests. From these, 76 were previously identified as Enterococcus faecalis, 44 as Enterococcus faecium, one as Enterococcus casseliflavus and 61 as Enteroccocus spp. In order to encompass several of the known chemical and functional classes of antibiotics, resistance to ampicillin, penicillin G, ciprofloxacin, chloramphenicol, erythromycin, nitrofurantoin, rifampicin, tetracycline and vancomycin was evaluated. All the isolates were sensitive to antibiotics of clinical importance, such as penicillins and vancomycin. Some differences in Minimal Inhibitory Concentrations (MICs) of antibiotics, could be associated with the enterococcal species.info:eu-repo/semantics/acceptedVersio

Experimental analysis of lateral impact on planar brittle material: spatial properties of the cracks

The breakup of glass and alumina plates due to planar impacts on one of their lateral sides is studied. Particular attention is given to investigating the spatial location of the cracks within the plates. Analysis based on a phenomenological model suggests that bifurcations along the cracks' paths are more likely to take place closer to the impact region than far away from it, i. e., the bifurcation probability seems to lower as the perpendicular distance from the impacted lateral in- creases. It is also found that many observables are not sensitive to the plate material used in this work, as long as the fragment multiplicities corresponding to the fragmentation of the plates are similar. This gives support to the universal properties of the fragmentation process reported in for- mer experiments. However, even under the just mentioned circumstances, some spatial observables are capable of distinguishing the material of which the plates are made and, therefore, it suggests that this universality should be carefully investigated

Concentrações plasmaticas de testosterona e suas relações com características reprodutivas em touros das raças Canchim e Nelore.

Níveis plasmaticos de testosterona foram determinados em 7 touros da raça canchim e 8 touros da raça nelore, aos 27 e 39 meses de idade.Resumo

Comportamento sexual de touros das raças Canchim e Nelore.

O comportamento sexual foi avaliado em sete touros da raça Canchim e oito Nelores aos 27 e 29 meses de idade, através dos testes de libido, capacidade de serviço e tempo de reação

Aspectos físicos do sêmen de touros das raças Canchim e Nelore.

Avaliação e comparação das características físicas do ejaculador de touros das raças Canchim e Nelore, criados em regime de pastos.Resumo

Comportamento sexual de touros das raças Canchim e Nelore.

Foram utilizados 7 touros Canchim e 8 touros Nelore, criados em regime de pasto e avaliados aos 2 e 3 anos de idade, nos períodos de Janeiro a Marco de 1986 e 1987, com o objetivo de avaliar o desempenho de touros Canchim e Nelore nos testes de comportamento sexual

The genus M alanea Aubl. (Rubiaceae, Guettardeae) in the Brazilian Amazon - species distribution and collection gaps

The Brazilian Amazon is the largest and richest tropical forest in the world. However, its biodiversity is still underestimated and severely threatened by deforestation. Malanea Aubl. (Rubiaceae, Guettardeae) is a neotropical genus of about 40 species, 15 of which occur in Brazil. This study aims to present species distributions and gaps in collections ofthis genus in the Brazilian Amazon. We collected occurrence records in the online databases Herbário Virtual Reflora (http:// reflora.jbrj.gov.br/reflora/herbarioVirtual/) and Herbário Virtual da Flora e Fungos do Brasil (https://specieslink.net/). After sorting and cleaning, data were plotted in QGIS 3.28 software to visualize the distribution of species and collection sites. 167 records of 11 species (Malanea auyantepuiensis Steyerm .,M duckei Standl.,M egleri Steyerm., M. gabrielensis M üll.Arg.,M hypoleuca Steyerm., M. macrophylla Bartl. ex G riseb.,M microphylla Standl. ex Steyerm., M. obovata H orch.,M panurensis M üll.Arg.,M sarmentosa Aubl., a n d M subtruncata Steyerm.) were found in the Brazilian Amazon, with Malanea auyantepuiensis being a new record. Malanea macrophylla, M. gabrielensis, and M. sarmentosa have more than 30 records well distributed in the región. The other species have two to ten collections. The State o f Amazonas, with seven species registered, can be considered the center o f diversity o f the genus in the Brazilian Amazon. The región bordering the Guiana Shield has six species, M. egleri, M. hypoleuca, M. macrophylla, M. microphylla, M. obovata, and M. panurensis. We highlight a concentration o f collection points in regions cióse to urban centres. The low sampling o f most species limits systematics and biogeographic studies o f the genus. Therefore, we emphasize the need to expand the sampling o f Malanea in the Brazilian Amazon. Understanding the mechanisms that influence the lineage diversification process in the Amazon may allow us to anticipate and/or mitigate the loss of biodiversity in this domain

Causas de variação do peso após o parto de vacas mestiças leiteiras

O objetivo do trabalho foi avaliar as causas de variação do peso após o parto de vacas mestiças leiteiras (1/2, 5/8, 3/4, 7/8 e >7/8 de raças especializadas de Bos taurus), criadas em um sistema de produção do tipo médio-insumo na Embrapa Pecuária Sudeste, em São Carlos, SP. Os dados de peso da vaca após o parto observados no período de 1981 a 2001 (n = 1.536) foram analisados pelo método dos quadrados mínimos, por meio de um modelo linear generalizado contendo os efeitos fixos de ano de parição (1981 a 2001), estação de parição (verão, outono, inverno, primavera), grupo genético (1/2, 5/8, 3/4, 7/8 e >7/8), ordem de parto (1 a 8) e os efeitos aleatórios de pai da vaca e erro. Houve efeitos significativos de ano de parição, estação de parição, ordem de parto e de pai da vaca sobre o peso após o parto. As médias estimadas do peso após o parto aumentaram com o decorrer dos anos, principalmente a partir de 1992 quando a maioria do rebanho era constituído por filhas de touros mestiços leiteiros em teste de progênie. As vacas com parição na primavera (outubro a dezembro) foram significativamente mais leves após o parto do que aquelas cujos partos ocorreram nas demais estações do ano. O peso da vaca após o parto aumentou da primeira até a quarta ordem de parto, estabilizando-se nas ordens seguintes. Não houve diferenças significativas entre os grupos genéticos. O efeito significativo de pai da vaca indica que há variação genética no rebanho para peso da vaca após o parto

Time-evolution of the Rule 150 cellular automaton activity from a Fibonacci iteration

The total activity of the single-seeded cellular rule 150 automaton does not follow a one-step iteration like other elementary cellular automata, but can be solved as a two-step vectorial, or string, iteration, which can be viewed as a generalization of Fibonacci iteration generating the time series from a sequence of vectors of increasing length. This allows to compute the total activity time series more efficiently than by simulating the whole spatio-temporal process, or even by using the closed expression.Comment: 4 pages (3 figs included