121 research outputs found
Effect of partial urethral obstruction on force development of the guinea pig bladder
We created gradual partial urethral obstruction in 20 guinea pigs using silver jeweler's jump rings. After 4 or 8 weeks obstruction all animals underwent cystometry and were assigned to one of five urodynamic categories: normal, high pressure voiding, unstable, low compliance, or decompensated. After sacrifice, the contractile responses of bladder strips to electrical field stimulation of intramural nerves, direct electrical muscle stimulation, 0.1 mM carbachol, and high K + solution were sampled by computer for phase plot analysis. Following 8 weeks obstruction, the value of the phase plot parameter Fiso, indicative of the number of contractile muscle units, was reduced to 60% of the control response to nerve stimulation (P < 0.05) and to 77% of the control response to carbachol stimulation (P < 0.05). Parameter C, the slope of the phase plot (indicative of unit recruitment during force development), was unchanged for all forms of stimulation. Although in the latter case not statistically significant, obstruction affected responses to nerve and muscle stimulation similarly suggesting that muscle change may possibly be a common denominator of dysfunction. In view of the reduction in Fiso and the increase in bladder weight, instability may represent a more advanced form of dysfunction due to obstruction than high pressure voiding
Evaluation of metabolic and biochemical blood parameters in lactating cows with Cystic Ovarian Disease
The aim of the study was to determine and evaluate different blood parameters associated to energetic,
protein, mineral and liver metabolic processes together with productive and reproductive parameters
in dairy cows of Santa Fe province (Argentina) that were diagnosed with cystic ovarian disease
(COD). Lactating Argentine Holstein cows from five dairy herds with spontaneous COD (n= 80)
diagnosed by ultrasound and control cows (n= 124) were included in the study. Blood samples were
obtained from all cows to determine serum concentrations of: growth hormone, insulin-like growth
factor (IGF-1), insulin, aspartate aminotransferase, alkalin phosphatase, gamma glutamiltransferase,
albumin, total proteins, albumin: globulin ratio, total and direct bilirrubin, ?-hidroxibutirate,
colesterol, glucose, urea, creatinin, calcium, phosphorus and magnesium. Serum concentrations
of insulin and IGF-1 were lower (P<0.05) in COD than control cows. No significant differences
among groups were observed in any other variables studied, however, the calving to conception
interval was higher in cows with COD compared to controls. These results allowed us to conclude
that there would be an association between blood concentrations of IGF-1 and insulin and COD
that, ultimately, compromise the reproductive performance of the cow.Fil: Cattaneo, L. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Teriogenología. Santa Fe, ArgentinaFil: Barberis, F.C. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Teriogenología. Santa Fe, ArgentinaFil: Stangaferro, M.L. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Cátedra de Teriogenología. Santa Fe, ArgentinaFil: Signorini, M.L. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. ArgentinaFil: Signorini, M.L. CONICET. ArgentinaFil: Ruiz, M.F. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Hospital de Salud Animal. Santa Fe, ArgentinaFil: Zimmermann, R. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Hospital de Salud Animal. Santa Fe, ArgentinaFil: Bo, G.A. Instituto de Reproducción Animal Córdoba (IRAC). ArgentinaFil: Hein, G.J. CONICET - Universidad Nacional del Litoral. Instituto de Ciencias Veterinarias del Litoral (ICiVet-Litoral). Esperanza, ArgentinaFil: Ortega, H.H. CONICET - Universidad Nacional del Litoral. Instituto de Ciencias Veterinarias del Litoral (ICiVet-Litoral). Esperanza, ArgentinaEl objetivo de este trabajo fue determinar y evaluar indicadores bioquímicos sanguíneos asociados
a procesos metabólicos energéticos, proteicos, minerales y de funcionalidad hepática, junto con
parámetros productivos y reproductivos en vacas lecheras que fueron diagnosticadas con enfermedad
quística ovárica (COD) y controles. Se emplearon vacas Holando Argentino en lactancia de 5
rebaños de la provincia de Santa Fe (Argentina) que presentaban COD (n= 80) diagnosticada
mediante ultrasonografía y controles clínicamente sanas (n= 124). De las vacas se obtuvo sangre
coccígea para determinar las concentraciones séricas de las hormonas de crecimiento (GH), factor
de crecimiento similar a la insulina-1 (IGF-1) e insulina, la actividad sérica de AST, FA, GGT y las
concentraciones séricas de albúmina, proteínas totales, relación albúmina: globulinas, bilirrubina
total y directa, ?-hidroxibutirato, colesterol, glucosa, urea, creatinina, calcio, fósforo y magnesio.
Las concentraciones séricas de insulina e IGF-1 fueron menores (P<0,05) en las vacas con COD
que en las controles. No se observaron diferencias significativas (P>0,05) entre ambos grupos en
las demás variables séricas y productivas evaluadas, sin embargo, el intervalo parto-concepción fue
mayor en vacas que presentaron COD. Los resultados nos permitieron concluir que habría una
asociación entre los valores séricos de IGF-1 e insulina y la COD, y que ésta comprometería el
futuro reproductivo de las vacas
The leading particle effect from light quark fragmentation in charm hadroproduction
The asymmetry of and meson production in scattering
observed by the E791 experiment is a typical phenomenon known as the leading
particle effect in charm hadroproducton. We show that the phenomenon can be
explained by the effect of light quark fragmentation into charmed hadrons
(LQF). Meanwhile, the size of the LQF effect is estimated from data of the E791
experiment.
A comparison is made with the estimate of the LQF effect from prompt
like-sign dimuon rate in neutrino experiments. The influence of the LQF effect
on the measurement of nucleon strange distribution asymmetry from charged
current charm production processes is briefly discussed.Comment: 6 latex pages, 1 figure, to appear in EPJ
Utilização de gonadotrofina coriônica humana e cipionato de estradiol associado ao dispositivo de liberação controlada de drogas para sincronização de ovulação em cabras da raça Saanen
Delivering 21st century Antarctic and Southern Ocean science
The Antarctic Roadmap Challenges (ARC) project identified critical requirements to deliver high priority Antarctic research in the 21st century. The ARC project addressed the challenges of enabling technologies, facilitating access, providing logistics and infrastructure, and capitalizing on international co-operation. Technological requirements include: i) innovative automated in situ observing systems, sensors and interoperable platforms (including power demands), ii) realistic and holistic numerical models, iii) enhanced remote sensing and sensors, iv) expanded sample collection and retrieval technologies, and v) greater cyber-infrastructure to process ‘big data’ collection, transmission and analyses while promoting data accessibility. These technologies must be widely available, performance and reliability must be improved and technologies used elsewhere must be applied to the Antarctic. Considerable Antarctic research is field-based, making access to vital geographical targets essential. Future research will require continent- and ocean-wide environmentally responsible access to coastal and interior Antarctica and the Southern Ocean. Year-round access is indispensable. The cost of future Antarctic science is great but there are opportunities for all to participate commensurate with national resources, expertise and interests. The scope of future Antarctic research will necessitate enhanced and inventive interdisciplinary and international collaborations. The full promise of Antarctic science will only be realized if nations act together
Efeito da somatotrofina bovina (bST-r), do implante de progestágeno e do desmame por 72 horas na indução do estro e na taxa de prenhez em vacas
Sincronização da onda folicular com hCG prévia à indução da luteólise com cloprostenol em bovinos
Effect of medroxy-progesterone acetate on follicular growth and endometrial cycloxygenase-2 (COX-2) expression during the bovine estrous cycle
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