The Clustering Of Galaxies Around Radio-Loud AGNs

We examine the hypothesis that mergers and close encounters between galaxies can fuel AGNs by increasing the rate at which gas accretes towards the central black hole. We compare the clustering of galaxies around radio-loud AGNs with the clustering around a population of radio-quiet galaxies with similar masses, colors and luminosities. Our catalog contains 2178 elliptical radio galaxies with flux densities greater than 2.8 mJy at 1.4 GHz from the 6dFGS survey. We find that radio AGNs with more than 200 times the median radio power have, on average, more close (r<160 kpc) companions than their radio-quiet counterparts, suggestive that mergers play a role in forming the most powerful radio galaxies. For ellipticals of fixed stellar mass, the radio power is not a function of large-scale environment nor halo mass, consistent with the radio powers of ellipticals varying by orders of magnitude over billions of years.Comment: 12 pages, 6 figure

Forced motion near black holes

We present two methods for integrating forced geodesic equations in the Kerr spacetime, which can accommodate arbitrary forces. As a test case, we compute inspirals under a simple drag force, mimicking the presence of gas. We verify that both methods give the same results for this simple force. We find that drag generally causes eccentricity to increase throughout the inspiral. This is a relativistic effect qualitatively opposite to what is seen in gravitational-radiation-driven inspirals, and similar to what is observed in hydrodynamic simulations of gaseous binaries. We provide an analytic explanation by deriving the leading order relativistic correction to the Newtonian dynamics. If observed, an increasing eccentricity would provide clear evidence that the inspiral was occurring in a non-vacuum environment. Our two methods are especially useful for evolving orbits in the adiabatic regime. Both use the method of osculating orbits, in which each point on the orbit is characterized by the parameters of the geodesic with the same instantaneous position and velocity. Both methods describe the orbit in terms of the geodesic energy, axial angular momentum, Carter constant, azimuthal phase, and two angular variables that increase monotonically and are relativistic generalizations of the eccentric anomaly. The two methods differ in their treatment of the orbital phases and the representation of the force. In one method the geodesic phase and phase constant are evolved together as a single orbital phase parameter, and the force is expressed in terms of its components on the Kinnersley orthonormal tetrad. In the second method, the phase constants of the geodesic motion are evolved separately and the force is expressed in terms of its Boyer-Lindquist components. This second approach is a generalization of earlier work by Pound and Poisson for planar forces in a Schwarzschild background.Comment: 28 pages, 2 figures, submitted to Phys. Rev. D; v2 has minor changes for consistency with published version, plus a new section discussing the relative advantages of the two approache

Aspirin Use in Children for Fever or Viral Syndromes

Aspirin should not be used to treat acute febrile viral illness in children. (Strength of Recommendation [SOR]: C, based on case- control studies). Although no causal link has been proven, data from case-control and historic cohort studies demonstrate an association between aspirin use and Reye syndrome

The Effect of Early vs. Normal Calf Weaning on Feedlot Performance and Herd Management: A Cross-Discipline Case Study

A study of early vs. normal weaning of calves concludes that early weaning improves feedlot production efficiency, reducing per day and per pound feedlot production costs. Early weaned steers finished higher thus feedlot profitability was not affected. Early weaning has a positive affect on cow health and pasture utilization rates.Livestock Production/Industries,

Agregação de Latossolo vermelho distrófico típico relacionada com o manejo na região dos cerrados no Estado de Minas Gerais.

As consequencias diretas do manejo inadequado do solo sao a erosao, a reducao da produtividade e a perda de sua sustentabilidade. Os indicadores da qualidade da estrutura do solo sao importantes ferramentas para avaliar a sustentabilidade dos sistemas de manejo. Este estudo objetivou avaliar a agregacao de um Latossolo Vermelho distrofico tipico sob diferentes sistemas de manejo na regiao dos cerrados em Sete Lagoas (MG). Dentre os sistemas de manejo estudados, a semeadura direta foi o que apresentou a maior percentagem de agregados nas classe > 2mm, menores nas classes 2mm (r = 0,92) e correlacao negativa com classes de agregados < 2 (r = .0,92) e < 1 mm (r = .0,93). Esses aspectos ressaltam o efeito benefico da semeadura direta, contribuindo para o manejo sustentado do solo

Association of Injury History and Incident Injury in Cadet Basic Military Training

To determine the association between injury history at enrollment and incident lower extremity (LE) injury during cadet basic training among first-year military cadets

Resistência a penetração e permeabilidade de Latossolo Vermelho distrófico típico sob sistemas de manejo na região dos cerrados.

As consequencias diretas do manejo inadequado do solo sao a erosao, a reducao da produtividade e a perda da sustentabilidade. Objetivou-se com este estudo avaliar a resistencia a penetracao (RP) e a permeabilidade do solo a agua (PER) sob sistemas de manejo em uso na regiao de cerrados. O estudo foi realizado na Embrapa Milho e Sorgo, em Sete Lagoas (MG), em Latossolo Vermelho distrofico tipico textura muito argilosa fase cerrado. O cerrado nativo propiciou menor densidade do solo, maior macroporosidade, maior volume total de poros, consequentemente, menor resistencia a penetracao (0,84 a 2,09 MPa) e maior permeabilidade (95 mmh-1). Foram verificados maiores valores de resistencia a penetracao vertical para o sistema com preparo convencional com arado de discos e cultivo em rotacao com milho e feijao, na profundidade de 15-30 cm no solo, sendo o valor 3,04 MPa classificado como alto, podendo ser um indicativo de restricao ao desenvolvimento radicular e compactacao do solo. De modo geral, ao longo do perfil do solo, os maiores valores de RP foram observados para o plantio direto. Nao houve diferencas significativas na PER entre os sistemas de manejo, estando os valores na faixa de 6 a 14 mmh-1, sendo a mesma classificada como lenta; estes valores foram bem inferiores aos do sistema em equilibrio. Os atributos fisicos utilizados neste estudo, como indicadores da qualidade do solo, apresentaram boa performance na distincao dos efeitos proporcionados pelos sistemas de manejo em relacao ao sistema em equilibrio, contribuindo para o monitoramento do manejo sustentavel de solos da regiao dos cerrados

Non-Equilibrium Statistical Physics of Currents in Queuing Networks

We consider a stable open queuing network as a steady non-equilibrium system of interacting particles. The network is completely specified by its underlying graphical structure, type of interaction at each node, and the Markovian transition rates between nodes. For such systems, we ask the question ``What is the most likely way for large currents to accumulate over time in a network ?'', where time is large compared to the system correlation time scale. We identify two interesting regimes. In the first regime, in which the accumulation of currents over time exceeds the expected value by a small to moderate amount (moderate large deviation), we find that the large-deviation distribution of currents is universal (independent of the interaction details), and there is no long-time and averaged over time accumulation of particles (condensation) at any nodes. In the second regime, in which the accumulation of currents over time exceeds the expected value by a large amount (severe large deviation), we find that the large-deviation current distribution is sensitive to interaction details, and there is a long-time accumulation of particles (condensation) at some nodes. The transition between the two regimes can be described as a dynamical second order phase transition. We illustrate these ideas using the simple, yet non-trivial, example of a single node with feedback.Comment: 26 pages, 5 figure

Secondary metabolites of Phlomis viscosa and their biological activities

Further phytochemical studies on the aerial parts of Phlomis viscosa (Lamiaceae) led to the isolation of 24 compounds: 3 iridoid glycosides, 10 phenylethanoid glycosides, a megastigmane glycoside and a hydroquinone glycoside, as well as 2 lignan glucosides and 7 neolignan glucosides, 1 of which is new (17b). Compound 17b was obtained as a minor component of an inseparable mixture (2:1) of 2 neolignan glucosides (17a/b), and characterized as 3',4-O-dimethylcedrusin 9-O-b -glucopyranoside. Full NMR data of the known 8-O-4' neolignan glucoside, erythro-1-(4-O-b-glucopyranosyl-3-methoxyphenyl)- 2-{2-methoxyl-4-[1-(E)-propene-3-ol]-phenoxyl}-propane-1,3-diol (18) are also reported. All isolated compounds were screened for cell growth inhibition versus 3 tumor cell lines (MCF7, NCI-H460, and SF-268) and several phenylethanoid glycosides were found to possess weak antitumoral activity. The phenylethanoid glycosides were also evaluated for their free radical (DPPH) scavenging, antibacterial and antifungal activities. The free radical (DPPH) scavenging activities of verbascoside (4), isoacteoside (5), forsythoside B (10), myricoside (13) and samioside (14) were found to be comparable to that of dl-a -tocopherol. Compounds 4, 5, 10 and 14 (MIC: 500 m g/mL) as well as Leucosceptoside A (8) and 13 (MIC:1000 m g/mL) showed very weak activity against Gram (+) bacteria