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Rotational Oscillation Effect on Flow Characteristics of a Circular Cylinder at Low Reynolds Number

World Journal of Mechanics 2015年第10期5卷 195-209页

作者： Alice Rosa da Silva aristeu da silveira-neto Antonio Marcos Goncalves de Lima School of Civil Engineering Federal University of UberlandiaUberlandiaBrazil School of Mechanical Engineering Federal University of UberlandiaBrazil

Two dimensional numerical simulations of flow around a rotationally oscillating circular cylinder were performed at Re = 1000. A wide range of forcing frequencies, fr, and three values of oscillation amplitudes, A, are considered. Different vortex shedding modes are observed for a fixed A at several values of fr, as well as for a fixed fr at different values of A. The 2C mode of vortex shedding was obtained in the present study. It is important to point out that this mode has not been observed by other investigators for rotationally oscillating case. Also, it is verified that this mechanism has great influence on the drag coefficient for high frequency values. Furthermore, the lift and pressure coefficients and the power spectra density are also analyzed.

关键词： Rotationally Oscillating Cylinder Vortex Shedding Modes Drag Coefficient

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Toxoplasma gondii causes death and plastic alteration in the jejunal myenteric plexus

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World Journal of Gastroenterology 2015年第16期21卷 4829-4839页

作者： Eduardo Joséde Almeida Araújo Larissa Marchi Zaniolo Suellen Laís Vicentino Marcelo Biondaro Góis Jacqueline Nelisis Zanoni aristeu Vieira da Silva Débora de Mello Goncales Sant'Ana Departamento de Histologia Centro de Ciencias BiológicasUniversidade Estadual de Londrina Programa de Pós-graduacao em Ciencia Animal Universidade Paranaense Departamento de Ciencias Morfológicas.Universidade Estadual de Maringa Departamento de Biologia Universidade Estadual de Feira de Santana

AIM:To assess the effects of ME-49 Toxoplasma gondii(***) strain infection on the myenteric plexus and external muscle of the jejunum in ***:Thirty rats were distributed into two groups:the control group(CG)(n = 15) received 1 m L of saline solution orally, and the infected group(IG)(n=15)inoculated with 1 m L of saline solution containing500 oocysts of M-49 *** strain *** 36 d of infection,the rats were *** with *** was confirmed by blood samples collected from all rats at the beginning and end of the *** jejunum of five animals was removed and submitted to routine histological processing(paraffin)for analysis of external muscle *** remaining jejunum from the others animals was used to analyze the general population and the NADH-diaphorase,VIPergic and nitrergic subpopulations of myenteric neurons;and the enteric glial cells(S100-IR).RESULTS:Serological analysis showed that animals from the IG were infected with the *** affecting jejunal muscle thickness was observed in the IG rats(77.02±42.71)in relation to the CG(51.40±12.34),P<*** addition,31.2%of the total number of myenteric neurons died(CG:39839.3±5362.3;IG:26766.6±2177.6;P<0.05);hyperplasia of nitrergic myenteric neurons was observed(CG:7959.0±1290.4;IG:10893.0±1156.3;P<0.05);general hypertrophy of the cell body in the remaining myenteric neurons was noted[CG:232.5(187.2-286.0);IG:248.2(204.4-293.0);P<0.05];hypertrophy of the smallest varicosities containing VIP neurotransmitter was seen(CG:0.46±0.10;IG:0.80±0.16;P<0.05)and a reduction of 25.3%in enteric glia cells(CG:12.64±1.27;IG:10.09±2.10;P<0.05)was observed in the infected ***:It was concluded that infection with oocysts of ME-49 *** strain caused quantitative and plastic alterations in the myenteric plexus of the jejunum in rats.

关键词： Enteric nervous system Infectious diseases Glial cells Nitric oxide Neuronal plasticity Smallintestine Toxoplasmosis Vasoactive intestinal peptide

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