Lasalocid
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Effects of antibiotic growth promoters mixed with mineral supplement on growth performance, ingestive behavior, and mineral intake of grazing bulls
ABSTRACT The objective was to evaluate the addition of antibiotic growth promoters to free-choice mineral supplement on ingestive behavior, mineral intake, and growth performance of grazing bulls. Sixty Nellore bulls [initial body weight (BW) of 219±17.8 kg and 15±2 months of age] were divided in 12 marandu grass paddocks. The treatments were: mineral supp
R. Bras. Zootec.. Publicado em: 29/07/2019
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2. Decoquinate, Lasalocid and Monensin for starter feeds and the performance of Holstein calves to 20 weeks of age.
2002
Scientia Agricola. Publicado em: 2011
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3. Desempenho de bovinos confinados suplementados com diferentes ionóforos / Performance of beef cattle in feedlot supplemented with different ionophores
O presente trabalho teve como objetivo a avaliação do desempenho de 36 bovinos castrados Nelore confinados durante 100 dias de experimentação. Os tratamentos foram: controle (sem ionóforo), 44 mg de lasalocida/kg de (MS) matéria seca de concentrado e 44 mg de monensina/kg de MS de concentrado. Como fonte de volumoso, foi utilizado feno de Coast-Cross (
Publicado em: 2004
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4. Efeito de lasalocid-A sobre o fluxo de Ca2+ mitocondrial
A previous communication (PEREIRA DA SILVA et alii, 1984) presented evidence that lasalocid-A, at concentrations far below those required to act as Ca2+ ionophore, significantly inhibited Ca2+ efflux from liver mitochondria. In the present work we have studied the mechanism of this inhibition in liver and heart mitocondria. Firstly it was observed that lasal
Publicado em: 1989
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5. Efficacy of lasalocid against murine Pneumocystis carinii pneumonitis.
The efficacy of the ionophore lasalocid against Pneumocystis carinii pneumonitis in corticosteroid-immunosuppressed Sprague-Dawley rats was investigated. Lasalocid was effective in the prevention of the pneumonitis in a dose-dependent manner. At dosages of 0, 5, 10, and 20 mg/kg/day, P. carinii infection rates were 92, 60, 20, and 0%, respectively, during de
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6. Effect of Monensin and Lasalocid-Sodium on the Growth of Methanogenic and Rumen Saccharolytic Bacteria
It is thought that monensin increases the efficiency of feed utilization by cattle by altering the rumen fermentation. We studied the effect of monensin and the related ionophore antibiotic lasalocid-sodium (Hoffman-LaRoche) on the growth of methanogenic and rumen saccharolytic bacteria in a complex medium containing rumen fluid. Ruminococcus albus, Ruminoco
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7. Structural and kinetic studies of lasalocid A (X537A) and its silver, sodium, and barium salts in nonpolar solvents.
The ionophore lasalocid A (X537A) and its metal salts have been investigated by high resolution (270 MHz and 360 MHz) proton nuclear magnetic resonance spectroscopy to obtain structural and kinetic information in nonpolar solution. The proton resonances were assigned from double resonance studies on lasalocid A and on its salts, homologs, isomers, and chemic
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8. Lasalocid-catalyzed proton conductance in Streptococcus bovis as affected by extracellular potassium.
The effect of extracellular potassium on lasalocid-catalyzed proton conductance in Streptococcus bovis 24 was measured by using the fluorescent probe 9-aminoacridine. Increasing external potassium concentration resulted in decreased proton flux into S. bovis cells exposed to the ionophore. These results suggest that lasalocid catalyzes K+/H+ exchange diffusi
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9. Use of potassium depletion to assess adaptation of ruminal bacteria to ionophores.
When mixed ruminal bacteria from cattle fed timothy hay were suspended in a medium containing a low concentration of potassium, monensin and lasalocid catalyzed a rapid depletion of potassium from cells. The ionophore-mediated potassium depletion was concentration dependent, and it was possible to describe the relationship with saturation constants. Mixed ru
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10. Biogenic amine-ionophore interactions: Structure and dynamics of lasalocid (X537A) complexes with phenethylamines and catecholamines in nonpolar solution
The ionophore lasalocid A forms 1:1 complexes with phenethylamines (1-amino-1-phenylethane and 1-amino-2-phenylethane) and catecholamines (dopamine and norepinephrine) in nonpolar solution. We have undertaken high-resolution proton nuclear magnetic resonance studies to deduce structural and kinetic information on the ionophore-biogenic amine complexes in chl
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11. Putative anticryptosporidial agents tested with an immunodeficient mouse model.
Lasalocid, sinefungin, and dehydroepiandrosterone were tested for anticryptosporidial activity with an immunodeficient mouse model at doses that have been reported effective when tested with immunosuppressed rodent models. Small but significant reductions in oocyst excretion were only observed under some conditions with lasalocid and dehydroepiandrosterone,
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12. Effect of ionophores and pH on growth of Streptococcus bovis in batch and continuous culture.
Batch cultures (pH 6.7) of Streptococcus bovis JB1 were severely inhibited by 1.25 and 5 microM lasalocid and monensin, respectively, even though large amounts of glucose remained in the medium. However, continuous cultures tolerated as much as 10 and 20 microM, respectively, and used virtually all of the glucose. Although continuous cultures grew with high