Epidemiologia do Boophilus microplus nas condições de cerrado.

O carrapato Boophilus microplus (Canestrini 1887), e um parasita temporário e obrigatório dos bovinos. Distribui-se geograficamente entre os paralelos 32 Norte e Sul, tendo ampla distribuição no México, América Central, América do Sul e Austrália.bitstream/item/137546/1/PESQ-EM-ANDAMENTO-23.pd

Aneurisma na artéria aorta em caprinos.

Resumo: De 726 caprinos necropsiados, dois (0,28%) apresentaram aneurisma na arteria aorta, sendo um macho com idade de 48 meses e uma femea com cerca de 30 meses. Os animais eram oriundos de um rebanho mantido em regime semi-extensivo com pastejo em caatinga nativa e pernoite em aprisco. Macroscopicamente observou-se palidez das mucosas externas e das visceras. Nas cavidades toracica e abdominal estavam presentes grandes coagulos resultantes da ruptura das partes afetadas das arterias. As lesoes das arterias aorta toracica e abdominal foram carcterizadas pela dilatacao das paredes formando estruturas saculares com presenca de inumeros coagulos e tecidos necroticos de aproximadamente 10cm a 20cm de comprimento. Histologicamente, observou-se a destruicao do tecido endotelial, necrose e infiltracao de leucocitos das camadas intima, media e muscular da arteria. Acredita-se que a causa primaria dos aneurismas detectados esteja relacionado com os processos inflamatorios presentes em outros orgaos. [Aneurism in the aorta artery in goats]. Abstract: Two (0.28%) of 726 necropsyed goats presented aneurism In the aorta artery, one being a male with 48 months and the other, a female about 30 months of age. The animais carne from a herd in semi-extensive regime, grazing in caatinga vegetation and spending the nights in appropriate pan. Paleness in external mucosa and viscera was observed macroscopically. Large coagula were presented in the thoracic and abdominal cavities, dueto ruptura ol the aneurismatic parts of the blood vessels. The lesions of thoracic and abdominal aortas were characterized by wali dilations forming saccular struc-tures, with presenco of many coagula and necrotic tissues of about 10cm to 20cm of length. Histo-logically, a destruetion In the endotelial tissues, nacrosis and infiltration of leucocytes in the intimate, median, and muscular Iayers were observed. It is believed that the primary cause of the aneurisms detected in this study would be related to teh inflamatory processes of other organs

Monitoramento por OPG e cultura de fezes de ovinos de uma propriedade rural na região de Bagé (2007-2009).

bitstream/item/55798/1/CT38.pd

Multiangle static and dynamic light scattering in the intermediate scattering angle range

We describe a light scattering apparatus based on a novel optical scheme covering the scattering angle range 0.5\dg \le \theta \le 25\dg, an intermediate regime at the frontier between wide angle and small angle setups that is difficult to access by existing instruments. Our apparatus uses standard, readily available optomechanical components. Thanks to the use of a charge-coupled device detector, both static and dynamic light scattering can be performed simultaneously at several scattering angles. We demonstrate the capabilities of our apparatus by measuring the scattering profile of a variety of samples and the Brownian dynamics of a dilute colloidal suspension

Dynamic correlations in stochastic rotation dynamics

The dynamic structure factor, vorticity and entropy density dynamic correlation functions are measured for Stochastic Rotation Dynamics (SRD), a particle based algorithm for fluctuating fluids. This allows us to obtain unbiased values for the longitudinal transport coefficients such as thermal diffusivity and bulk viscosity. The results are in good agreement with earlier numerical and theoretical results, and it is shown for the first time that the bulk viscosity is indeed zero for this algorithm. In addition, corrections to the self-diffusion coefficient and shear viscosity arising from the breakdown of the molecular chaos approximation at small mean free paths are analyzed. In addition to deriving the form of the leading correlation corrections to these transport coefficients, the probabilities that two and three particles remain collision partners for consecutive time steps are derived analytically in the limit of small mean free path. The results of this paper verify that we have an excellent understanding of the SRD algorithm at the kinetic level and that analytic expressions for the transport coefficients derived elsewhere do indeed provide a very accurate description of the SRD fluid.Comment: 33 pages including 16 figure

Statistical Properties of the Interbeat Interval Cascade in Human Subjects

Statistical properties of interbeat intervals cascade are evaluated by considering the joint probability distribution $P(\Delta x_2,\tau_2;\Delta x_1,\tau_1)$ for two interbeat increments $\Delta x_1$ and $\Delta x_2$ of different time scales $\tau_1$ and $\tau_2$. We present evidence that the conditional probability distribution $P(\Delta x_2,\tau_2|\Delta x_1,\tau_1)$ may obey a Chapman-Kolmogorov equation. The corresponding Kramers-Moyal (KM) coefficients are evaluated. It is shown that while the first and second KM coefficients, i.e., the drift and diffusion coefficients, take on well-defined and significant values, the higher-order coefficients in the KM expansion are very small. As a result, the joint probability distributions of the increments in the interbeat intervals obey a Fokker-Planck equation. The method provides a novel technique for distinguishing the two classes of subjects in terms of the drift and diffusion coefficients, which behave differently for two classes of the subjects, namely, healthy subjects and those with congestive heart failure.Comment: 5 pages, 6 figure

Redução e esterilização de ovos de nematódeos gastrintestinais em caprinos medicados com anti-helmínticos benzimidazois.

Resumo: Determinou-se a atividade ovicida "in vivo"; e também a duraçao da mesma dos benzimidazóis: oxfendazole, fenbendazole, aIbendazole e thiabendazole ern nernatódeos gastrintestinais de caprinos. Cabras naturalmente infectadas com nematódeos gastrintestinais foram medicadas com oxfendazole (4,75 rng/kg),. fenbendazole (5,0 rng/kg) e thiabendazole (44,0 mg/kg). Realizaram-se coletas de fezes diretamente da ampola retal para deteminação do número de ovos por grama de fezes (OPG) e realização de coproculturas, antes do tratamento e ern períodos subseqüentes de três até doze horas após o tratamento. Posteriormente, as coletas passaram a ser realizadas com intervalos de 12 até 168 horas. 0 thiabendazole mostrou boa atividade na redução e esterilização de ovos de Strongyloides, ocorrendo o inverso com relação ao Haemonchus e Oesophagostomum. 0 oxfendazole, fenbendazole e aIbendazole apresentaram boa atividade na redução e esterilização de ovos de Trichostrongyus, nao tendo a mesma atividade ern Haemonchus e Strongyloides. O oxfendazole e o thiabendazole foram os únicos benzimidazóis que impediram o desenvolvimento e a multiplicação de fêmeas de Strongyloides de vida livre nas coproculturas dos animais vermifugados. [Reduction and sterilization of eggs of gastrointestinal namatodes in goats dewormed with benzimidazoles anthelmintics]. The ovicide activity, 'in vivo", otthe benzimidazoles: oxtendazole, lenbendazole, albendazole and thiabendazole on caprine gasfrointestirial nematodes was determined and compared. Female goats naturally intected with gastmniestinal nematodes were mediealed with oxtendazole (435 mglkg), tenbendazole (5.0 mglkg), albendazole (3,8 mglkg) and thiabendazoie (44.0 mglkg). Feces were collected trom the rectum to determine lhe number ai eggs per gram (EPG) and to make lecal cultures, betore medication and at subsequent periods irom throe lo twelve hours after medication. Atterwards, coliections were perlormed ai intervale ol 12 to 168 hours. Thiabendazole showed good activity on the reduction and stnrilization ot Strongyloides eggs but did not show lhe same activily against I-laemonchus and Oesophagostomum. Oxiendazole, fenbendazole, and albendazole had good activily on the reduction and sterihzation ot lhe eggs 01 Trichostrongylus and Oesophagostomum, bul did not have the same activity on Haemonchus and Sftongyloides. Oxtendazole and thiabendazole were the only benzímidazoles that curbed the developmenl and multiplication of the fite living temale Strongy?oides in lecal cuRtires ai deworrned animais

Stochastic Feedback and the Regulation of Biological Rhythms

We propose a general approach to the question of how biological rhythms spontaneously self-regulate, based on the concept of ``stochastic feedback''. We illustrate this approach by considering the neuroautonomic regulation of the heart rate. The model generates complex dynamics and successfully accounts for key characteristics of cardiac variability, including the $1/f$ power spectrum, the functional form and scaling of the distribution of variations, and correlations in the Fourier phases. Our results suggest that in healthy systems the control mechanisms operate to drive the system away from extreme values while not allowing it to settle down to a constant output.Comment: 15 pages, latex2e using rotate and epsf, with 4 ps figures. Submitted to PR

Redução do número de ovos por grama de fezes (OPG) em caprinos e ovinos medicados com anti-helmínticos.

Resumo: Este trabalho avaliou a eficacia de alguns anti-helminticos na reducao do OPG em caprinos e ovinos. Para iisto foram delineados tres experimentos. No experimento 1 foram testados os benzimidozois: fenbendazole (5,0 mg?kg), exfendazole (4,75 mg/kg), albendazole (3,8 mg/kg) e thiabendazole (44,0 mg/kg) em infeccoes naturais por nematodeos em caprinos. No experimento 2, foi feita uma infecai experimental com 4.000 larvas de Haemonchus contortus em caprinos e ovinos, e posteriormente testados o ivermectin (200 mcg/kg) e o netobimin (20 mg/kg). No experimento 3 avaliou-se o levamisole (7,5 mg/kg) em ovinos naturalmente infectados com nematodeos. A reducao do OPG nos caprinos medicados com benzimidazois foi de 84,3%, 92,8%, 73,2% e 30,0%, para o fenbendazole, oxfendazole, albendazole e thiabendazole, respectivamente. O ivermectin e o netobimin foram os unicos produtos que apresentaram uma reducao no OPG de 100% em caprinos e ovinos infectados experimentalmente com H. contortus. O levamisole nao apresentou uma boa eficacia na eliminacao de formas imaturas de nematodeos em ovinos. [Reduction of number of eggs per gram of feces (EPG) in goats and sheep medicated with antihelmintics].bitstream/item/36454/1/PB-11.pdfTrabalho apresentado no 5o. Seminário de Pesquisa Agropecuária do Piauí, Teresina, outubro, 1988

First science results from SOFIA/FORCAST: The mid-infrared view of the compact HII region W3A

The massive star forming region W3 was observed with the faint object infrared camera for the SOFIA telescope (FORCAST) as part of the Short Science program. The 6.4, 6.6, 7.7, 19.7, 24.2, 31.5 and 37.1 \um bandpasses were used to observe the emission of Polycyclic Aromatic Hydrocarbon (PAH) molecules, Very Small Grains and Big Grains. Optical depth and color temperature maps of W3A show that IRS2 has blown a bubble devoid of gas and dust of $\sim$0.05 pc radius. It is embedded in a dusty shell of ionized gas that contributes 40% of the total 24 \um emission of W3A. This dust component is mostly heated by far ultraviolet, rather than trapped Ly$\alpha$ photons. This shell is itself surrounded by a thin ($\sim$0.01 pc) photodissociation region where PAHs show intense emission. The infrared spectral energy distribution (SED) of three different zones located at 8, 20 and 25\arcsec from IRS2, show that the peak of the SED shifts towards longer wavelengths, when moving away from the star. Adopting the stellar radiation field for these three positions, DUSTEM model fits to these SEDs yield a dust-to-gas mass ratio in the ionized gas similar to that in the diffuse ISM. However, the ratio of the IR-to-UV opacity of the dust in the ionized shell is increased by a factor $\simeq$3 compared to the diffuse ISM.Comment: Accepted for publication in ApJ letters; 13 pages, 3 figures 1 tabl